8390614: RISC-V: Support VerifyOops for AOT caching stub and code

JDK-8388417 added this support for x86 and AArch64 but left RISC-V behind.
Now that JDK-8390102 has enabled the AOT code cache on RISC-V, the verify_oop
stub is archived while it still materializes values that are only valid in the
JVM that dumped the cache: the verify_oop mask and bits are emitted as
immediates, and the address of the diagnostic string is emitted without a
relocation, so it dangles in the JVM that loads the cache.

Load the verify_oop mask and bits from AOTRuntimeConstants while dumping, and
preserve the diagnostic strings with AOTCodeCache::add_C_string() so that they
survive into a new JVM instance. The string address is materialized through
ExternalAddress() so that it carries a relocation and gets patched on load.

Skip the VerifyOops code when VerifyAdapterSharing is on, because the address
of the code string may differ between otherwise equivalent adapters.

Assert that the registers passed to the GC check_oop() implementations are
distinct.

.git-blame-ignore-revs

@@ -0,0 +1,184 @@
+# git blame ignore revs file
+#
+# The list of revisions below will be ignored by git-blame (1) if this file gets
+# passed via the --ignore-revs-file command line option or is configured using
+# the blame.ignoreRevsFile key.
+#
+# Only add commits that obviously do not change semantics, e.g. mechanical refactorings
+# or formatting. Always add the commit message as a comment above the revision
+# to keep the file readable.
+
+# 8299973: Replace NULL with nullptr in share/utilities/
+1084fd24eb118d4131538c2a3ead714db7d0357b
+
+# 8299974: Replace NULL with nullptr in share/adlc/
+62537d200f01d58ff1c236f31f71c5839316db9e
+
+# 8300081: Replace NULL with nullptr in share/asm/
+9d5bab11f08a992803399f422d75b17f8607df72
+
+# 8300086: Replace NULL with nullptr in share/c1/
+90d5041b6a055d6266140ffea2aa9a3b08b32209
+
+# 8300087: Replace NULL with nullptr in share/cds/
+eca64795be63c599a637ce2a7f740b2d0a1ec9bc
+
+# 8300222: Replace NULL with nullptr in share/logging
+bd5ca953058704087da4bc5796b3ce28ce2a8f78
+
+# 8300240: Replace NULL with nullptr in share/ci/
+f52d35c84b7333809156d201c866793854143888
+
+# 8300241: Replace NULL with nullptr in share/classfile/
+49ff52087be8b95cbf369518281312ecc9d83618
+
+# 8300242: Replace NULL with nullptr in share/code/
+cfe57466ddecb93b528478d0b053b089dd1ed285
+
+# 8300243: Replace NULL with nullptr in share/compiler/
+fcbf9d052efd16821750fb20813f8030ee828472
+
+# 8300244: Replace NULL with nullptr in share/interpreter/
+a5d8e12872d9de399fa97b33896635d101b71372
+
+# 8300245: Replace NULL with nullptr in share/jfr/
+cc396895e5a1dac49f4e341ce91c04b8c092d0af
+
+# 8300651: Replace NULL with nullptr in share/runtime/
+71107f4648d8f31a7bcc0aa5202ef46230df583f
+
+# 8301068: Replace NULL with nullptr in share/jvmci/
+90ec19efeda90f13a918b4481fe6ee552ab2af66
+
+# 8301069: Replace NULL with nullptr in share/libadt/
+b0376a5f4421fb58c0feeddfce2c2083314e400c
+
+# 8301070: Replace NULL with nullptr in share/memory/
+d98a323a8b972c17a066c597a81b164681ad5589
+
+# 8301072: Replace NULL with nullptr in share/oops/
+c8ace482edead720c865cf996729a316025d937e
+
+# 8301074: Replace NULL with nullptr in share/opto/
+5726d31e56530bbe7dee61ae04b126e20cb3611d
+
+# 8301076: Replace NULL with nullptr in share/prims/
+b76a52f2104b63e84e5d09f47ce01dd0cb3935d7
+
+# 8301077: Replace NULL with nullptr in share/services/
+5c1ec82656323872c4628026662fe5b62e7a61e3
+
+# 8301178: Replace NULL with nullptr in share/gc/epsilon/
+b77abc6a0daed0e01a9003d42493320376dc98bc
+
+# 8301179: Replace NULL with nullptr in share/gc/serial/
+107e184d59c0bbed6441a3c1a9bfd4527da3bce5
+
+# 8301180: Replace NULL with nullptr in share/gc/parallel/
+3758487fda61b27e7e684413793ed28c0b9e64d3
+
+# 8301223: Replace NULL with nullptr in share/gc/g1/
+75a4edca6b9fa6b3e66b564aeb4d7ca8acf02491
+
+# 8301225: Replace NULL with nullptr in share/gc/shenandoah/
+0c9658446d111ec944f06b7a8a4e3ae7bf53ee8d
+
+# 8301477: Replace NULL with nullptr in os/aix
+43288bbd684abfcefdf385ed1e0307070399ccbf
+
+# 8301478: Replace NULL with nullptr in os/bsd
+716f1df609e7f0aa7b3b9383d23dde5c71017d02
+
+# 8301479: Replace NULL with nullptr in os/linux
+ac9e046748a9bb6ee065dc473d82135ce36043b7
+
+# 8301480: Replace NULL with nullptr in os/posix
+4539899c55c77771b951d005c17550ef9ac94819
+
+# 8301481: Replace NULL with nullptr in os/windows
+c91cd2814baa8dee2af8af0fecf9185d4a0a44cf
+
+# 8301493: Replace NULL with nullptr in cpu/aarch64
+948f3b3c24709eca3aa6c3f0db6adb9226d6f9ac
+
+# 8301494: Replace NULL with nullptr in cpu/arm
+c4ffe4bf6369d5b271aa8689b8648f3fe8dcabed
+
+# 8301495: Replace NULL with nullptr in cpu/ppc
+0826ceee65ab83f643a77716f8f12d0060369923
+
+# 8301496: Replace NULL with nullptr in cpu/riscv
+d2ce04bb101002abfdb7c8adb3fa8ea267903c36
+
+# 8301497: Replace NULL with nullptr in cpu/s390
+54f7b6ca34986cc26c5b91c6724b9a1754c94391
+
+# 8301498: Replace NULL with nullptr in cpu/x86
+4154a980ca28c1ae56db26e3dce64c07c225de12
+
+# 8301499: Replace NULL with nullptr in cpu/zero
+4e327db1d127c652ef39e31c164e36ae429a0065
+
+# 8301500: Replace NULL with nullptr in os_cpu/aix_ppc
+c8307e37fdf4453cade84efc113d93dd14333fd0
+
+# 8301501: Replace NULL with nullptr in os_cpu/bsd_aarch64
+218223e4a31d485935655cb3f186a752defd8fa8
+
+# 8301502: Replace NULL with nullptr in os_cpu/bsd_x86
+6daff6b26946748360d59a12e9069a08ab5ca06d
+
+# 8301503: Replace NULL with nullptr in os_cpu/bsd_zero
+8cc399b672c6ce08037685b3a3a2db3c53a87b50
+
+# 8301504: Replace NULL with nullptr in os_cpu/linux_aarch64
+13fcd602d37eb0095f169255128588b872639571
+
+# 8301505: Replace NULL with nullptr in os_cpu/linux_arm
+b81f0ff43ac8d1431f2f5dccb7499a3a1503823d
+
+# 8301506: Replace NULL with nullptr in os_cpu/linux_ppc
+b1e96989b693aadea082a01576e25f85ed28ff0d
+
+# 8301507: Replace NULL with nullptr in os_cpu/linux_riscv
+182d1b2fb7034b6e9177dc360cbea43d548c3ff0
+
+# 8301508: Replace NULL with nullptr in os_cpu/linux_s390
+d097b5e6285e1a59632211e006592fedf2047c09
+
+# 8301509: Replace NULL with nullptr in os_cpu/linux_x86
+5d1f71daf06870810c9ca24e911d6191cc4f3006
+
+# 8301511: Replace NULL with nullptr in os_cpu/linux_zero
+42a286a15862d9a05ea3477a9eeab46e7b33e599
+
+# 8301512: Replace NULL with nullptr in os_cpu/windows_aarch64
+ad79e49141f063a61090eda69d96dc580db88949
+
+# 8301513: Replace NULL with nullptr in os_cpu/windows_x86
+c109dae48c61c6fbeacadf59d509d37d2c4d2bb8
+
+# 8308092: Replace NULL with nullptr in gc/x
+599fa774b875da971d66f79e5e43ede2b5ce18aa
+
+# 8309044: Replace NULL with nullptr, final sweep of hotspot code
+4f16161607edbf69f423ced1d3c24f7af058d46b
+
+# 8324286: Fix backsliding on use of nullptr instead of NULL
+bcb340da091e3287da8d2ecfcd017ebcc6613cae
+
+# 8324678: Replace NULL with nullptr in HotSpot gtests
+c1281e6b45ed167df69d29a6039d81854c145ae6
+
+# 8324679: Replace NULL with nullptr in HotSpot .ad files
+b3ecd55601d483359819d02e70789bbd412b13da
+
+# 8324680: Replace NULL with nullptr in JVMTI generated code
+267780bf0adf4bfd831fbc04347e297fa8f3bb01
+
+# 8324681: Replace NULL with nullptr in HotSpot jtreg test native code files
+a6bdee48f39993128d8095d40ab417f0102af0f4
+
+# 8324799: Use correct extension for C++ test headers
+998d0baab0fd051c38d9fd6021628eb863b80554
+

.github/actions/build-jtreg/action.yml

@@ -37,13 +37,13 @@ runs:
 
     - name: 'Check cache for already built JTReg'
       id: get-cached
-      uses: actions/cache@v4
+      uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
       with:
         path: jtreg/installed
         key: jtreg-${{ steps.version.outputs.value }}
 
     - name: 'Checkout the JTReg source'
-      uses: actions/checkout@v4
+      uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
       with:
         repository: openjdk/jtreg
         ref: jtreg-${{ steps.version.outputs.value }}
@@ -61,7 +61,7 @@ runs:
       if: (steps.get-cached.outputs.cache-hit != 'true')
 
     - name: 'Upload JTReg artifact'
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
       with:
         name: bundles-jtreg-${{ steps.version.outputs.value }}
         path: jtreg/installed

.github/actions/do-build/action.yml

@@ -66,7 +66,7 @@ runs:
       shell: bash
 
     - name: 'Upload build logs'
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
       with:
         name: failure-logs-${{ inputs.platform }}${{ inputs.debug-suffix }}
         path: failure-logs
@@ -74,7 +74,7 @@ runs:
 
       # This is the best way I found to abort the job with an error message
     - name: 'Notify about build failures'
-      uses: actions/github-script@v7
+      uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
       with:
         script: core.setFailed('Build failed. See summary for details.')
       if: steps.check.outputs.failure == 'true'

.github/actions/get-bootjdk/action.yml

@@ -65,7 +65,7 @@ runs:
 
     - name: 'Check cache for BootJDK'
       id: get-cached-bootjdk
-      uses: actions/cache@v4
+      uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
       with:
         path: bootjdk/jdk
         key: boot-jdk-${{ inputs.platform }}-${{ steps.sha256.outputs.value }}

.github/actions/get-bundles/action.yml

@@ -54,14 +54,14 @@ runs:
   steps:
     - name: 'Download bundles artifact'
       id: download-bundles
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
       with:
         name: bundles-${{ inputs.platform }}${{ inputs.debug-suffix }}
         path: bundles
       continue-on-error: true
 
     - name: 'Download bundles artifact (retry)'
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
       with:
         name: bundles-${{ inputs.platform }}${{ inputs.debug-suffix }}
         path: bundles
@@ -69,7 +69,7 @@ runs:
 
     - name: 'Download static bundles artifact'
       id: download-static-bundles
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
       with:
         name: bundles-${{ inputs.platform }}${{ inputs.debug-suffix }}${{ inputs.static-suffix }}
         path: bundles

.github/actions/get-gtest/action.yml

@@ -40,7 +40,7 @@ runs:
         var: GTEST_VERSION
 
     - name: 'Checkout GTest source'
-      uses: actions/checkout@v4
+      uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
       with:
         repository: google/googletest
         ref: 'v${{ steps.version.outputs.value }}'

.github/actions/get-jtreg/action.yml

@@ -41,7 +41,7 @@ runs:
 
     - name: 'Download JTReg artifact'
       id: download-jtreg
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
       with:
         name: bundles-jtreg-${{ steps.version.outputs.value }}
         path: jtreg/installed

.github/actions/get-msys2/action.yml

@@ -25,20 +25,49 @@
 
 name: 'Get MSYS2'
 description: 'Download MSYS2 and prepare a Windows host'
+inputs:
+  architecture:
+    description: 'Architecture'
+    required: true
 
 runs:
   using: composite
   steps:
-    - name: 'Install MSYS2'
-      id: msys2
-      uses: msys2/setup-msys2@v2.28.0
+    - name: 'Install MSYS2 on x86.x64'
+      id: msys2-x64
+      uses: msys2/setup-msys2@66cd2cce69caa17b53920067426061ca1de3a884 # v2.32.0
       with:
         install: 'autoconf tar unzip zip make'
         path-type: minimal
         release: false
+      if: ${{ inputs.architecture == 'x86.x64' }}
+
+    - name: 'Install MSYS2 on ARM64'
+      id: msys2-arm64
+      uses: msys2/setup-msys2@66cd2cce69caa17b53920067426061ca1de3a884 # v2.32.0
+      with:
+        install: 'autoconf tar unzip zip make'
+        path-type: minimal
+        release: true
+        location: ${{ runner.tool_cache }}/msys2
+      if: ${{ inputs.architecture == 'ARM64' }}
 
       # We can't run bash until this is completed, so stick with pwsh
-    - name: 'Set MSYS2 path'
+    - name: 'Set MSYS2 path for x64'
       run: |
-        echo "${{ steps.msys2.outputs.msys2-location }}/usr/bin" >> $env:GITHUB_PATH
+        echo "${{ steps.msys2-x64.outputs.msys2-location }}/usr/bin" >> $env:GITHUB_PATH
       shell: pwsh
+      if: ${{ inputs.architecture == 'x86.x64' }}
+
+    - name: 'Set MSYS2 path for ARM64'
+      run: |
+        echo "${{ steps.msys2-arm64.outputs.msys2-location }}/usr/bin" >> $env:GITHUB_PATH
+      shell: pwsh
+      if: ${{ inputs.architecture == 'ARM64' }}
+
+    # Remove the default config.site file provided by MSYS2 to ensure config.guess accurately detects the host system.
+    - name: 'Remove default config.site'
+      run: |
+        echo "Removing default config.site"
+        rm -f /etc/config.site
+      shell: env /usr/bin/bash --login -eo pipefail {0}

.github/actions/upload-bundles/action.yml

@@ -87,7 +87,7 @@ runs:
       shell: bash
 
     - name: 'Upload bundles artifact'
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
       with:
         name: bundles-${{ inputs.platform }}${{ inputs.debug-suffix }}${{ inputs.static-suffix }}${{ inputs.bundle-suffix }}
         path: bundles

.github/pull_request_template.md

@@ -0,0 +1,5 @@
+
+
+
+---------
+- [ ] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai).

.github/workflows/build-alpine-linux.yml

@@ -74,7 +74,7 @@ jobs:
 
     steps:
       - name: 'Checkout the JDK source'
-        uses: actions/checkout@v4
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
 
       - name: 'Install toolchain and dependencies'
         run: |

.github/workflows/build-cross-compile.yml

@@ -54,18 +54,11 @@ jobs:
       fail-fast: false
       matrix:
         target-cpu:
-          - aarch64
           - arm
           - s390x
           - ppc64le
           - riscv64
         include:
-          - target-cpu: aarch64
-            gnu-arch: aarch64
-            debian-arch: arm64
-            debian-repository: https://httpredir.debian.org/debian/
-            debian-version: trixie
-            tolerate-sysroot-errors: false
           - target-cpu: arm
             gnu-arch: arm
             debian-arch: armhf
@@ -94,7 +87,7 @@ jobs:
 
     steps:
       - name: 'Checkout the JDK source'
-        uses: actions/checkout@v4
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
 
       - name: 'Get the BootJDK'
         id: bootjdk
@@ -122,7 +115,7 @@ jobs:
 
       - name: 'Check cache for sysroot'
         id: get-cached-sysroot
-        uses: actions/cache@v4
+        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
         with:
           path: sysroot
           key: sysroot-${{ matrix.debian-arch }}-${{ hashFiles('./.github/workflows/build-cross-compile.yml') }}

.github/workflows/build-linux.yml

@@ -31,6 +31,14 @@ on:
       platform:
         required: true
         type: string
+      runs-on:
+        required: false
+        type: string
+        default: 'ubuntu-24.04'
+      bootjdk-platform:
+        required: false
+        type: string
+        default: 'linux-x64'
       extra-conf-options:
         required: false
         type: string
@@ -75,7 +83,7 @@ on:
 jobs:
   build-linux:
     name: build
-    runs-on: ubuntu-24.04
+    runs-on: ${{ inputs.runs-on }}
 
     strategy:
       fail-fast: false
@@ -84,13 +92,13 @@ jobs:
 
     steps:
       - name: 'Checkout the JDK source'
-        uses: actions/checkout@v4
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
 
       - name: 'Get the BootJDK'
         id: bootjdk
         uses: ./.github/actions/get-bootjdk
         with:
-          platform: linux-x64
+          platform: ${{ inputs.bootjdk-platform }}
 
       - name: 'Get JTReg'
         id: jtreg

.github/workflows/build-macos.yml

@@ -75,7 +75,7 @@ jobs:
 
     steps:
       - name: 'Checkout the JDK source'
-        uses: actions/checkout@v4
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
 
       - name: 'Get the BootJDK'
         id: bootjdk

.github/workflows/build-windows.yml

@@ -31,6 +31,9 @@ on:
       platform:
         required: true
         type: string
+      runs-on:
+        required: true
+        type: string
       extra-conf-options:
         required: false
         type: string
@@ -45,7 +48,7 @@ on:
       msvc-toolset-version:
         required: true
         type: string
-      msvc-toolset-architecture:
+      architecture:
         required: true
         type: string
       configure-arguments:
@@ -67,7 +70,7 @@ env:
 jobs:
   build-windows:
     name: build
-    runs-on: windows-2025
+    runs-on: ${{ inputs.runs-on }}
     defaults:
       run:
         shell: bash
@@ -83,16 +86,18 @@ jobs:
 
     steps:
       - name: 'Checkout the JDK source'
-        uses: actions/checkout@v4
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
 
       - name: 'Get MSYS2'
         uses: ./.github/actions/get-msys2
+        with:
+          architecture: ${{ inputs.architecture }}
 
       - name: 'Get the BootJDK'
         id: bootjdk
         uses: ./.github/actions/get-bootjdk
         with:
-          platform: windows-x64
+          platform: ${{ inputs.platform }}
 
       - name: 'Get JTReg'
         id: jtreg
@@ -102,26 +107,49 @@ jobs:
         id: gtest
         uses: ./.github/actions/get-gtest
 
-      - name: 'Check toolchain installed'
-        id: toolchain-check
+      - name: 'Check toolchain installed for x64'
+        id: toolchain-check-x64
         run: |
           set +e
           '/c/Program Files/Microsoft Visual Studio/2022/Enterprise/vc/auxiliary/build/vcvars64.bat' -vcvars_ver=${{ inputs.msvc-toolset-version }}
           if [ $? -eq 0 ]; then
-            echo "Toolchain is already installed"
+            echo "Toolchain is already installed for x64"
             echo "toolchain-installed=true" >> $GITHUB_OUTPUT
           else
-            echo "Toolchain is not yet installed"
+            echo "Toolchain is not yet installed for x64"
             echo "toolchain-installed=false" >> $GITHUB_OUTPUT
           fi
+        if: ${{ inputs.architecture == 'x86.x64' }}
 
-      - name: 'Install toolchain and dependencies'
+      - name: 'Check toolchain installed for ARM64'
+        id: toolchain-check-arm64
+        run: |
+          set +e
+          "/c/Program Files/Microsoft Visual Studio/2022/Enterprise/vc/auxiliary/build/vcvarsarm64.bat" -vcvars_ver=${{ inputs.msvc-toolset-version }}
+          if [ $? -eq 0 ]; then
+            echo "Toolchain is already installed for ARM64"
+            echo "toolchain-installed=true" >> $GITHUB_OUTPUT
+          else
+            echo "Toolchain is not yet installed for ARM64"
+            echo "toolchain-installed=false" >> $GITHUB_OUTPUT
+          fi
+        if: ${{ inputs.architecture == 'ARM64' }}
+
+      - name: 'Install toolchain and dependencies for x64'
         run: |
           # Run Visual Studio Installer
           '/c/Program Files (x86)/Microsoft Visual Studio/Installer/vs_installer.exe' \
             modify --quiet --installPath 'C:\Program Files\Microsoft Visual Studio\2022\Enterprise' \
-            --add Microsoft.VisualStudio.Component.VC.${{ inputs.msvc-toolset-version }}.${{ inputs.msvc-toolset-architecture }}
-        if: steps.toolchain-check.outputs.toolchain-installed != 'true'
+            --add Microsoft.VisualStudio.Component.VC.${{ inputs.msvc-toolset-version }}.x86.x64
+        if: ${{ (inputs.architecture == 'x86.x64') && (steps.toolchain-check-x64.outputs.toolchain-installed != 'true') }}
+
+      - name: 'Install toolchain and dependencies for ARM64'
+        run: |
+          # Run Visual Studio Installer
+          '/c/Program Files (x86)/Microsoft Visual Studio/Installer/vs_installer.exe' \
+            modify --quiet --installPath 'C:\Program Files\Microsoft Visual Studio\2022\Enterprise' \
+            --add Microsoft.VisualStudio.Component.VC.${{ inputs.msvc-toolset-version }}.ARM64
+        if: ${{ ( inputs.architecture == 'ARM64') && (steps.toolchain-check-arm64.outputs.toolchain-installed != 'true') }}
 
       - name: 'Configure'
         run: >

.github/workflows/main.yml

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2022, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2022, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -34,7 +34,7 @@ on:
       platforms:
         description: 'Platform(s) to execute on (comma separated, e.g. "linux-x64, macos, aarch64")'
         required: true
-        default: 'linux-x64, linux-x64-variants, linux-cross-compile, alpine-linux-x64, macos-x64, macos-aarch64, windows-x64, windows-aarch64, docs'
+        default: 'linux-x64, linux-x64-variants, linux-aarch64, linux-cross-compile, alpine-linux-x64, macos-x64, macos-aarch64, windows-x64, windows-aarch64, docs'
       configure-arguments:
         description: 'Additional configure arguments'
         required: false
@@ -64,6 +64,7 @@ jobs:
     outputs:
       linux-x64: ${{ steps.include.outputs.linux-x64 }}
       linux-x64-variants: ${{ steps.include.outputs.linux-x64-variants }}
+      linux-aarch64: ${{ steps.include.outputs.linux-aarch64 }}
       linux-cross-compile: ${{ steps.include.outputs.linux-cross-compile }}
       alpine-linux-x64: ${{ steps.include.outputs.alpine-linux-x64 }}
       macos-x64: ${{ steps.include.outputs.macos-x64 }}
@@ -75,7 +76,7 @@ jobs:
 
     steps:
       - name: 'Checkout the scripts'
-        uses: actions/checkout@v4
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           sparse-checkout: |
             .github
@@ -176,6 +177,7 @@ jobs:
 
           echo "linux-x64=$(check_platform linux-x64 linux x64)" >> $GITHUB_OUTPUT
           echo "linux-x64-variants=$(check_platform linux-x64-variants variants)" >> $GITHUB_OUTPUT
+          echo "linux-aarch64=$(check_platform linux-aarch64 linux aarch64)" >> $GITHUB_OUTPUT
           echo "linux-cross-compile=$(check_platform linux-cross-compile cross-compile)" >> $GITHUB_OUTPUT
           echo "alpine-linux-x64=$(check_platform alpine-linux-x64 alpine-linux x64)" >> $GITHUB_OUTPUT
           echo "macos-x64=$(check_platform macos-x64 macos x64)" >> $GITHUB_OUTPUT
@@ -201,6 +203,20 @@ jobs:
       dry-run: ${{ needs.prepare.outputs.dry-run == 'true' }}
     if: needs.prepare.outputs.linux-x64 == 'true'
 
+  build-linux-aarch64:
+    name: linux-aarch64
+    needs: prepare
+    uses: ./.github/workflows/build-linux.yml
+    with:
+      platform: linux-aarch64
+      runs-on: 'ubuntu-24.04-arm'
+      bootjdk-platform: linux-aarch64
+      gcc-major-version: '14'
+      configure-arguments: ${{ github.event.inputs.configure-arguments }}
+      make-arguments: ${{ github.event.inputs.make-arguments }}
+      dry-run: ${{ needs.prepare.outputs.dry-run == 'true' }}
+    if: needs.prepare.outputs.linux-aarch64 == 'true'
+
   build-linux-x64-hs-nopch:
     name: linux-x64-hs-nopch
     needs: prepare
@@ -295,7 +311,7 @@ jobs:
       dry-run: ${{ needs.prepare.outputs.dry-run == 'true' }}
       # Upload static libs bundles separately to avoid interference with normal linux-x64 bundle.
       # This bundle is not used by testing jobs, but downstreams use it to check that
-      # dependent projects, e.g. libgraal, builds fine.
+      # dependent projects build fine.
       bundle-suffix: "-static-libs"
     if: needs.prepare.outputs.linux-x64-variants == 'true'
 
@@ -353,8 +369,9 @@ jobs:
     uses: ./.github/workflows/build-windows.yml
     with:
       platform: windows-x64
+      runs-on: windows-2022
+      architecture: 'x86.x64'
       msvc-toolset-version: '14.44'
-      msvc-toolset-architecture: 'x86.x64'
       configure-arguments: ${{ github.event.inputs.configure-arguments }}
       make-arguments: ${{ github.event.inputs.make-arguments }}
       dry-run: ${{ needs.prepare.outputs.dry-run == 'true' }}
@@ -366,10 +383,9 @@ jobs:
     uses: ./.github/workflows/build-windows.yml
     with:
       platform: windows-aarch64
+      runs-on: windows-11-arm
+      architecture: 'ARM64'
       msvc-toolset-version: '14.44'
-      msvc-toolset-architecture: 'arm64'
-      make-target: 'hotspot'
-      extra-conf-options: '--openjdk-target=aarch64-unknown-cygwin'
       configure-arguments: ${{ github.event.inputs.configure-arguments }}
       make-arguments: ${{ github.event.inputs.make-arguments }}
       dry-run: ${{ needs.prepare.outputs.dry-run == 'true' }}
@@ -423,6 +439,19 @@ jobs:
       dry-run: ${{ needs.prepare.outputs.dry-run == 'true' }}
       static-suffix: "-static"
 
+  test-linux-aarch64:
+    name: linux-aarch64
+    needs:
+      - prepare
+      - build-linux-aarch64
+    uses: ./.github/workflows/test.yml
+    with:
+      platform: linux-aarch64
+      bootjdk-platform: linux-aarch64
+      runs-on: ubuntu-24.04-arm
+      dry-run: ${{ needs.prepare.outputs.dry-run == 'true' }}
+      debug-suffix: -debug
+
   test-macos-aarch64:
     name: macos-aarch64
     needs:
@@ -446,6 +475,21 @@ jobs:
     with:
       platform: windows-x64
       bootjdk-platform: windows-x64
-      runs-on: windows-2025
+      architecture: 'x86.x64'
+      runs-on: windows-2022
+      dry-run: ${{ needs.prepare.outputs.dry-run == 'true' }}
+      debug-suffix: -debug
+
+  test-windows-aarch64:
+    name: windows-aarch64
+    needs:
+      - prepare
+      - build-windows-aarch64
+    uses: ./.github/workflows/test.yml
+    with:
+      platform: windows-aarch64
+      bootjdk-platform: windows-aarch64
+      architecture: 'ARM64'
+      runs-on: windows-11-arm
       dry-run: ${{ needs.prepare.outputs.dry-run == 'true' }}
       debug-suffix: -debug

.github/workflows/test.yml

@@ -37,6 +37,9 @@ on:
       runs-on:
         required: true
         type: string
+      architecture:
+        required: false
+        type: string
       xcode-toolset-version:
         required: false
         type: string
@@ -128,10 +131,12 @@ jobs:
 
     steps:
       - name: 'Checkout the JDK source'
-        uses: actions/checkout@v4
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
 
       - name: 'Get MSYS2'
         uses: ./.github/actions/get-msys2
+        with:
+          architecture: ${{ inputs.architecture }}
         if: runner.os == 'Windows'
 
       - name: 'Get the BootJDK'
@@ -239,7 +244,7 @@ jobs:
         if: always()
 
       - name: 'Upload test results'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           path: results
           name: ${{ steps.package.outputs.artifact-name }}
@@ -247,7 +252,7 @@ jobs:
 
         # This is the best way I found to abort the job with an error message
       - name: 'Notify about test failures'
-        uses: actions/github-script@v7
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         with:
           script: core.setFailed('${{ steps.run-tests.outputs.error-message }}')
         if: steps.run-tests.outputs.failure == 'true'

.gitignore

@@ -16,6 +16,7 @@ NashornProfile.txt
 **/JTreport/**
 **/JTwork/**
 /src/utils/LogCompilation/target/
+/src/utils/LogCompilation/logc.jar
 /.project/
 /.settings/
 /compile_commands.json
@@ -23,8 +24,6 @@ NashornProfile.txt
 /.gdbinit
 /.lldbinit
 **/core.[0-9]*
-*.rej
-*.orig
 test/benchmarks/**/target
 /src/hotspot/CMakeLists.txt
 /src/hotspot/compile_commands.json

.jcheck/conf

@@ -1,7 +1,7 @@
 [general]
 project=jdk
 jbs=JDK
-version=27
+version=28
 
 [checks]
 error=author,committer,reviewers,merge,issues,executable,symlink,message,hg-tag,whitespace,problemlists,copyright

bin/idea.sh

@@ -187,14 +187,18 @@ fi
 SOURCE_PREFIX="<sourceFolder url=\"file://"
 SOURCE_POSTFIX="\" isTestSource=\"false\" />"
 
+# SOURCES is a single string containing embeded newlines.
 for root in $MODULE_ROOTS; do
     if [ "x$CYGPATH" != "x" ]; then
       root=`$CYGPATH -am $root`
     elif [ "x$WSL_DISTRO_NAME" != "x" ]; then
       root=`wslpath -am $root`
     fi
-
-    SOURCES=$SOURCES" $SOURCE_PREFIX""$root""$SOURCE_POSTFIX"
+    # Add line termination/indentation for everything after the first entry.
+    if [ "x$SOURCES" != "x" ]; then
+      SOURCES="${SOURCES}\n      "
+    fi
+    SOURCES="${SOURCES}${SOURCE_PREFIX}${root}${SOURCE_POSTFIX}"
 done
 
 add_replacement "###SOURCE_ROOTS###" "$SOURCES"

doc/building.html

@@ -146,6 +146,7 @@ Performance</a>
 <li><a href="#virus-checking" id="toc-virus-checking">Virus
 Checking</a></li>
 <li><a href="#ccache" id="toc-ccache">Ccache</a></li>
+<li><a href="#sccache" id="toc-sccache">Sccache</a></li>
 <li><a href="#precompiled-headers"
 id="toc-precompiled-headers">Precompiled Headers</a></li>
 <li><a href="#icecc-icecream" id="toc-icecc-icecream">Icecc /
@@ -365,11 +366,13 @@ free disk space is required.</p>
 also possible to use <a href="#cross-compiling">cross-compiling</a>.</p>
 <h4 id="branch-protection">Branch Protection</h4>
 <p>In order to use Branch Protection features in the VM,
-<code>--enable-branch-protection</code> must be used. This option
-requires C++ compiler support (GCC 9.1.0+ or Clang 10+). The resulting
-build can be run on both machines with and without support for branch
-protection in hardware. Branch Protection is only supported for Linux
-targets.</p>
+<code>--enable-branch-protection</code> must be used. This option requires C++
+compiler support for <code>-mbranch-protection=standard</code> in GCC 9.1.0+ or
+Clang 10+ on Linux/AArch64 or for <code>/guard:signret</code> in Visual Studio
+2019+ on Windows/ARM64. The resulting build can be run on both machines with and
+without support for branch protection in hardware. Branch Protection is fully
+supported for the Linux/AArch64 target and only partially supported for the
+Windows/ARM64 targets.</p>
 <h3 id="building-on-32-bit-arm">Building on 32-bit ARM</h3>
 <p>This is not recommended. Instead, see the section on <a
 href="#cross-compiling">Cross-compiling</a>.</p>
@@ -394,11 +397,11 @@ to date at the time of writing.</p>
 <tbody>
 <tr class="odd">
 <td>Linux/x64</td>
-<td>Oracle Enterprise Linux 6.4 / 8.x</td>
+<td>Oracle Linux 6.4 / 8.x</td>
 </tr>
 <tr class="even">
 <td>Linux/aarch64</td>
-<td>Oracle Enterprise Linux 7.6 / 8.x</td>
+<td>Oracle Linux 7.6 / 8.x</td>
 </tr>
 <tr class="odd">
 <td>macOS</td>
@@ -545,7 +548,7 @@ earlier versions may also work.</p>
 no longer comes bundled with Xcode, so it needs to be installed
 separately. This can either be done via the Xcode's Settings/Components
 UI, or in the command line calling
-<code>xcodebuild -downloadComponent metalToolchain</code>.</p>
+<code>xcodebuild -downloadComponent MetalToolchain</code>.</p>
 <p>The standard macOS environment contains the basic tooling needed to
 build, but for external libraries a package manager is recommended. The
 JDK uses <a href="https://brew.sh/">homebrew</a> in the examples, but
@@ -1495,26 +1498,24 @@ following targets are known to work:</p>
 </tr>
 </tbody>
 </table>
-<p><code>BASE_OS</code> must be one of <code>OL</code> for Oracle
-Enterprise Linux or <code>Fedora</code>. If the base OS is
-<code>Fedora</code> the corresponding Fedora release can be specified
-with the help of the <code>BASE_OS_VERSION</code> option. If the build
-is successful, the new devkits can be found in the
+<p><code>BASE_OS</code> must be one of <code>OL</code> for Oracle Linux
+or <code>Fedora</code>. The release/version of the base OS can be
+specified using the <code>BASE_OS_VERSION</code> option. If the build is
+successful, the new devkits can be found in the
 <code>build/devkit/result</code> subdirectory:</p>
 <pre><code>cd make/devkit
-make TARGETS=&quot;ppc64le-linux-gnu aarch64-linux-gnu&quot; BASE_OS=Fedora BASE_OS_VERSION=21
+make TARGETS=&quot;ppc64le-linux-gnu aarch64-linux-gnu&quot; BASE_OS=Fedora
 ls -1 ../../build/devkit/result/
 x86_64-linux-gnu-to-aarch64-linux-gnu
 x86_64-linux-gnu-to-ppc64le-linux-gnu</code></pre>
 <p>Notice that devkits are not only useful for targeting different build
 platforms. Because they contain the full build dependencies for a system
-(i.e. compiler and root file system), they can easily be used to build
-well-known, reliable and reproducible build environments. You can for
-example create and use a devkit with GCC 7.3 and a Fedora 12 sysroot
-environment (with glibc 2.11) on Ubuntu 14.04 (which doesn't have GCC
-7.3 by default) to produce JDK binaries which will run on all Linux
-systems with runtime libraries newer than the ones from Fedora 12 (e.g.
-Ubuntu 16.04, SLES 11 or RHEL 6).</p>
+(i.e., compiler and root file system/sysroot), they can easily be used
+to build well-known, reliable, and reproducible build environments. You
+can, for example, create and use a devkit with a version of the GCC
+compiler not provided by the host OS, using a sysroot from an older
+Linux distribution to produce JDK binaries which will run on all Linux
+systems with newer runtime libraries.</p>
 <h4 id="using-debian-debootstrap">Using Debian debootstrap</h4>
 <p>On Debian (or a derivative like Ubuntu), you can create sysroots for
 foreign architectures with tools provided by the OS. You can use
@@ -1816,6 +1817,14 @@ Using ccache can radically speed up compilation of native code if you
 often rebuild the same sources. Your mileage may vary however, so we
 recommend evaluating it for yourself. To enable it, make sure it's on
 the path and configure with <code>--enable-ccache</code>.</p>
+<h3 id="sccache">Sccache</h3>
+<p>The JDK build supports building with sccache when using gcc, clang, or
+Microsoft toolchains.  To enable it, make sure the sccache binary is on the path
+(or specify the path to the binary using the <code>SCCACHE</code> argument to
+the configure script) and configure with <code>--enable-sccache</code>.  To
+optionally specify where sccache stores its cache files, use
+<code>--with-sccache-dir</code>.  Precompiled headers are disabled when sccache
+is enabled.</p>
 <h3 id="precompiled-headers">Precompiled Headers</h3>
 <p>By default, the Hotspot build uses pre-compiled headers (PCH) on the
 toolchains were it is properly supported (clang, gcc, and Visual

doc/building.md

@@ -171,9 +171,11 @@ possible to use [cross-compiling](#cross-compiling).
 
 In order to use Branch Protection features in the VM,
 `--enable-branch-protection` must be used. This option requires C++ compiler
-support (GCC 9.1.0+ or Clang 10+). The resulting build can be run on both
-machines with and without support for branch protection in hardware. Branch
-Protection is only supported for Linux targets.
+support for `-mbranch-protection=standard` in GCC 9.1.0+ or Clang 10+ on
+Linux/AArch64 or for `/guard:signret` in Visual Studio 2019+ on Windows/ARM64.
+The resulting build can be run on both machines with and without support for
+branch protection in hardware. Branch Protection is fully supported for the
+Linux/AArch64 target and only partially supported for the Windows/ARM64 target.
 
 ### Building on 32-bit ARM
 
@@ -195,8 +197,8 @@ time of writing.
 
 | Operating system  | Vendor/version used                |
 | ----------------- | ---------------------------------- |
-| Linux/x64         | Oracle Enterprise Linux 6.4 / 8.x  |
-| Linux/aarch64     | Oracle Enterprise Linux 7.6 / 8.x  |
+| Linux/x64         | Oracle Linux 6.4 / 8.x             |
+| Linux/aarch64     | Oracle Linux 7.6 / 8.x             |
 | macOS             | macOS 14.x                         |
 | Windows           | Windows Server 2016                |
 
@@ -355,7 +357,7 @@ earlier versions may also work.
 Starting with Xcode 26, introduced in macOS 26, the Metal toolchain no longer
 comes bundled with Xcode, so it needs to be installed separately. This can
 either be done via the Xcode's Settings/Components UI, or in the command line
-calling `xcodebuild -downloadComponent metalToolchain`.
+calling `xcodebuild -downloadComponent MetalToolchain`.
 
 The standard macOS environment contains the basic tooling needed to build, but
 for external libraries a package manager is recommended. The JDK uses
@@ -1288,27 +1290,26 @@ at least the following targets are known to work:
 | riscv64-linux-gnu        |
 | s390x-linux-gnu          |
 
-`BASE_OS` must be one of `OL` for Oracle Enterprise Linux or `Fedora`. If the
-base OS is `Fedora` the corresponding Fedora release can be specified with the
-help of the `BASE_OS_VERSION` option. If the build is successful, the new
-devkits can be found in the `build/devkit/result` subdirectory:
+`BASE_OS` must be one of `OL` for Oracle Linux or `Fedora`. The release/version
+of the base OS can be specified using the `BASE_OS_VERSION` option. If the build
+is successful, the new devkits can be found in the `build/devkit/result`
+subdirectory:
 
 ```
 cd make/devkit
-make TARGETS="ppc64le-linux-gnu aarch64-linux-gnu" BASE_OS=Fedora BASE_OS_VERSION=21
+make TARGETS="ppc64le-linux-gnu aarch64-linux-gnu" BASE_OS=Fedora
 ls -1 ../../build/devkit/result/
 x86_64-linux-gnu-to-aarch64-linux-gnu
 x86_64-linux-gnu-to-ppc64le-linux-gnu
 ```
 
 Notice that devkits are not only useful for targeting different build
-platforms. Because they contain the full build dependencies for a system (i.e.
-compiler and root file system), they can easily be used to build well-known,
-reliable and reproducible build environments. You can for example create and
-use a devkit with GCC 7.3 and a Fedora 12 sysroot environment (with glibc 2.11)
-on Ubuntu 14.04 (which doesn't have GCC 7.3 by default) to produce JDK binaries
-which will run on all Linux systems with runtime libraries newer than the ones
-from Fedora 12 (e.g. Ubuntu 16.04, SLES 11 or RHEL 6).
+platforms. Because they contain the full build dependencies for a system (i.e.,
+compiler and root file system/sysroot), they can easily be used to build
+well-known, reliable, and reproducible build environments. You can, for example,
+create and use a devkit with a version of the GCC compiler not provided by the
+host OS, using a sysroot from an older Linux distribution to produce JDK
+binaries which will run on all Linux systems with newer runtime libraries.
 
 #### Using Debian debootstrap
 
@@ -1556,6 +1557,15 @@ the same sources. Your mileage may vary however, so we recommend evaluating it
 for yourself. To enable it, make sure it's on the path and configure with
 `--enable-ccache`.
 
+### Sccache
+
+The JDK build supports building with sccache when using gcc, clang, or Microsoft
+toolchains.  To enable it, make sure the sccache binary is on the path (or
+specify the path to the binary using the `SCCACHE` argument to the configure
+script) and configure with `--enable-sccache`.  To optionally specify where
+sccache stores its cache files, use `--with-sccache-dir`.  Precompiled headers
+are disabled when sccache is enabled.
+
 ### Precompiled Headers
 
 By default, the Hotspot build uses pre-compiled headers (PCH) on the toolchains

doc/testing.html

@@ -284,9 +284,10 @@ possible, or if you want to use a fully qualified test descriptor, add
 <h3 id="gtest">Gtest</h3>
 <p><strong>Note:</strong> To be able to run the Gtest suite, you need to
 configure your build to be able to find a proper version of the gtest
-source. For details, see the section <a
-href="building.html#running-tests">"Running Tests" in the build
-documentation</a>.</p>
+source. For details, see the section <strong>"Running Tests" in the
+build documentation</strong> (<a
+href="building.html#running-tests">html</a>, <a
+href="building.md#running-tests">markdown</a>).</p>
 <p>Since the Hotspot Gtest suite is so quick, the default is to run all
 tests. This is specified by just <code>gtest</code>, or as a fully
 qualified test descriptor <code>gtest:all</code>.</p>
@@ -464,6 +465,44 @@ class, named Virtual, is currently part of the JDK build in the
 <code>test/jtreg_test_thread_factory/</code> directory. This class gets
 compiled during the test image build. The implementation of the Virtual
 class creates a new virtual thread for executing each test class.</p>
+<h4 id="value_class_plugin">VALUE_CLASS_PLUGIN</h4>
+<p>Enables the <code>ValueClassPlugin</code> javac plugin when compiling
+and running JTReg tests. This is a <strong>temporary mode</strong>
+intended for use while value classes (JEP 401) are a preview feature.
+The long-term plan is to replace classes annotated with
+<code>@jdk.test.lib.valueclass.AsValueClass</code> with plain
+<code>value class</code> declarations once value classes are
+finalized.</p>
+<p>In the meantime, this mode allows test sources to compile and run as
+either value classes or regular identity classes without source-level
+changes.</p>
+<p>When set to any non-empty value, the following options are appended to
+every JTReg invocation:</p>
+<ul>
+<li><code>-cpa:&lt;valueClassPlugin.jar&gt;</code> — appends the plugin
+JAR to the compile-time classpath (only when the JAR is present in the
+test image under
+<code>jtreg_value_class_plugin/valueClassPlugin.jar</code>).</li>
+<li><code>-vmoption:--enable-preview</code> — enables JVM preview
+features at runtime.</li>
+<li><code>-javacoption:-XDaccessInternalAPI</code> — grants the compiler
+access to internal APIs required by the plugin.</li>
+<li><code>-javacoption:--source &lt;version&gt; --enable-preview</code>
+— enables preview language features at compile time.</li>
+<li><code>-javacoption:-Xplugin:ValueClassPlugin</code> — activates the
+plugin.</li>
+</ul>
+<p>The plugin scans each compilation unit after parsing and converts any
+class annotated with
+<code>@jdk.test.lib.valueclass.AsValueClass</code> into a value class by
+setting the internal <code>VALUE_CLASS</code> modifier flag and clearing
+the <code>IDENTITY_TYPE</code> flag. This transformation only takes
+effect when <code>--enable-preview</code> is active; without it the
+annotation is a no-op and the class compiles as an ordinary identity
+class, so the same test source can exercise both code paths.</p>
+<p>Example:</p>
+<pre><code>$ make test TEST=jdk_lang JTREG="VALUE_CLASS_PLUGIN=true"
+</code></pre>
 <h4 id="jvmti_stress_agent">JVMTI_STRESS_AGENT</h4>
 <p>Executes JTReg tests with JVM TI stress agent. The stress agent is
 the part of test library and located in

doc/testing.md

@@ -198,8 +198,8 @@ use a fully qualified test descriptor, add `jtreg:`, e.g.
 
 **Note:** To be able to run the Gtest suite, you need to configure your build
 to be able to find a proper version of the gtest source. For details, see the
-section ["Running Tests" in the build
-documentation](building.html#running-tests).
+section **"Running Tests" in the build
+documentation** ([html](building.html#running-tests), [markdown](building.md#running-tests)).
 
 Since the Hotspot Gtest suite is so quick, the default is to run all tests.
 This is specified by just `gtest`, or as a fully qualified test descriptor
@@ -403,6 +403,42 @@ the `test/jtreg_test_thread_factory/` directory. This class gets compiled
 during the test image build. The implementation of the Virtual class creates a
 new virtual thread for executing each test class.
 
+#### VALUE_CLASS_PLUGIN
+
+Enables the `ValueClassPlugin` javac plugin when compiling and running JTReg
+tests. This is a **temporary mode** intended for use while value classes
+(JEP 401) are a preview feature. The long-term plan is to replace classes
+annotated with `@jdk.test.lib.valueclass.AsValueClass` with plain
+`value class` declarations once value classes are finalized.
+
+In the meantime, this mode allows test sources to compile and run as either
+value classes or regular identity classes without source-level changes.
+
+When set to any non-empty value, the following options are appended to every
+JTReg invocation:
+
+* `-cpa:<valueClassPlugin.jar>` — appends the plugin JAR to the compile-time
+  classpath (only when the JAR is present in the test image under
+  `jtreg_value_class_plugin/valueClassPlugin.jar`).
+* `-vmoption:--enable-preview` — enables JVM preview features at runtime.
+* `-javacoption:-XDaccessInternalAPI` — grants the compiler access to internal
+  APIs required by the plugin.
+* `-javacoption:--source <version> --enable-preview` — enables preview language
+  features at compile time.
+* `-javacoption:-Xplugin:ValueClassPlugin` — activates the plugin.
+
+The plugin scans each compilation unit after parsing and converts any class
+annotated with `@jdk.test.lib.valueclass.AsValueClass` into a value class by
+setting the internal `VALUE_CLASS` modifier flag and clearing the
+`IDENTITY_TYPE` flag. This transformation only takes effect when
+`--enable-preview` is active; without it the annotation is a no-op and the
+class compiles as an ordinary identity class, so the same test source can
+exercise both code paths.
+
+Example:
+
+    $ make test TEST=jdk_lang JTREG="VALUE_CLASS_PLUGIN=true"
+
 #### JVMTI_STRESS_AGENT
 
 Executes JTReg tests with JVM TI stress agent. The stress agent is the part of

doc/value-class-preview.html

@@ -0,0 +1,188 @@
+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml" lang="" xml:lang="">
+<head>
+  <meta charset="utf-8" />
+  <meta name="generator" content="pandoc" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes" />
+  <title>Migration of JDK Classes to Value Classes</title>
+  <style>
+    code{white-space: pre-wrap;}
+    span.smallcaps{font-variant: small-caps;}
+    div.columns{display: flex; gap: min(4vw, 1.5em);}
+    div.column{flex: auto; overflow-x: auto;}
+    div.hanging-indent{margin-left: 1.5em; text-indent: -1.5em;}
+    ul.task-list{list-style: none;}
+    ul.task-list li input[type="checkbox"] {
+      width: 0.8em;
+      margin: 0 0.8em 0.2em -1.6em;
+      vertical-align: middle;
+    }
+    .display.math{display: block; text-align: center; margin: 0.5rem auto;}
+  </style>
+  <link rel="stylesheet" href="../make/data/docs-resources/resources/jdk-default.css" />
+  <style type="text/css">pre, code, tt { color: #1d6ae5; }</style>
+  <!--[if lt IE 9]>
+    <script src="//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.3/html5shiv-printshiv.min.js"></script>
+  <![endif]-->
+</head>
+<body>
+<header id="title-block-header">
+<h1 class="title">Migration of JDK Classes to Value Classes</h1>
+</header>
+<nav id="TOC" role="doc-toc">
+<ul>
+<li><a href="#introduction" id="toc-introduction">Introduction</a></li>
+<li><a href="#the-build-process" id="toc-the-build-process">The Build
+Process</a>
+<ul>
+<li><a href="#the-custom-handling-for-the-value-objects-jep"
+id="toc-the-custom-handling-for-the-value-objects-jep">The Custom
+Handling for the Value Objects JEP</a></li>
+<li><a href="#the-general-preview-source-to-binary-pipeline"
+id="toc-the-general-preview-source-to-binary-pipeline">The General
+Preview Source to Binary Pipeline</a></li>
+<li><a href="#non-goals" id="toc-non-goals">Non-Goals</a></li>
+</ul></li>
+<li><a href="#testing" id="toc-testing">Testing</a></li>
+<li><a href="#wrapper-class-caches"
+id="toc-wrapper-class-caches">Wrapper Class Caches</a></li>
+<li><a href="#editing-this-document"
+id="toc-editing-this-document">Editing This Document</a></li>
+</ul>
+</nav>
+<h2 id="introduction">Introduction</h2>
+<p>The Value Objects feature introduces value objects and migrates
+suitable classes to value classes. This means that when preview features
+are enabled, different class files are used for the migrated classes in
+the Java class library.</p>
+<p>To accomplish this, a built JDK uses <em>preview-specific</em> files
+in <code>META-INF/preview</code>, which overrides the regular files of
+the same name. For example,
+<code>META-INF/preview/java/lang/Integer.class</code> overrides
+<code>java/lang/Integer.class</code>.</p>
+<p>The JDK generates preview-specific source files (they may use preview
+language features), compiles class files from them, and distributes
+these class files in <code>META-INF/preview</code>.</p>
+<h2 id="the-build-process">The Build Process</h2>
+<h3 id="the-custom-handling-for-the-value-objects-jep">The Custom
+Handling for the Value Objects JEP</h3>
+<p>The Value Objects JEP requires a few select classes in the
+<code>java.base</code> module to become value classes when preview
+features are enabled.</p>
+<p>The build of <code>java.base</code> module first creates the source
+code of those value classes, done in <a
+href="../make/modules/java.base/gensrc/GensrcValueClasses.gmk"><code>GensrcValueClasses.gmk</code></a>.</p>
+<ol type="1">
+<li><p>A hardcoded list of regular source files are selected for
+preview-specific generation.</p></li>
+<li><p>Extract the content of each regular source file, search for any
+occurrences of <code>/*value*/ class</code> or
+<code>/*value*/ record</code>, and replace with <code>value class</code>
+or <code>value record</code>.</p></li>
+<li><p>The replaced contents are written to the preview-specific
+generated files, located in
+<code>support/gensrc-valueclasses/java.base/</code>. The regular source
+files remain unchanged in their original locations.</p></li>
+<li><p>The general preview source to binary build pipeline recognizes
+the <code>support/gensrc-valueclasses/java.base/</code> directory as
+where the <code>java.base</code> module places its preview-specific
+source files.</p></li>
+</ol>
+<h3 id="the-general-preview-source-to-binary-pipeline">The General
+Preview Source to Binary Pipeline</h3>
+<p>Once the preview-specific source files are ready, they are picked up
+by the build system into a fully automated pipeline handling all modules
+and all outcome images.</p>
+<ol type="1">
+<li><p>The <code>GENERATED_PREVIEW_SUBDIRS</code> variable in <a
+href="../make/common/Modules.gmk"><code>make/common/Modules.gmk</code></a>
+indicates where the source files are found.</p></li>
+<li><p>For each module that has preview-specific source files, a goal is
+created to compile these source files into class files.</p></li>
+<li><p>The class files from each of these tasks reside in
+<code>support/preview/&lt;module&gt;</code> for each module.</p></li>
+<li><p>These preview-specific class files and other resources are copied
+to the <code>META-INF/preview</code> directory of the regular output
+directory.</p></li>
+<li><p>At run-time, jimage will pick up the preview-specific overrides
+from <code>META-INF/preview</code> only when preview features are
+enabled.</p></li>
+<li><p>The interim javac used by the build system cannot pick up the
+preview-specific overrides; they must be supplied explicitly with the
+following javac flag for every single module where overrides are
+significant:</p>
+<pre><code>--patch-module &lt;module&gt;=$(SUPPORT_OUTPUTDIR)/preview/&lt;module&gt;</code></pre>
+<p>See <a
+href="../make/test/BuildMicrobenchmark.gmk"><code>BuildMicroBenchmarks.gmk</code></a>
+for an example.</p></li>
+</ol>
+<h3 id="non-goals">Non-Goals</h3>
+<p>The Value Objects JEP only plans to introduce value classes that
+are:</p>
+<ol type="1">
+<li><p>In the <code>java.base</code> module.</p>
+<p>There's no plan to migrate other classes in other modules.</p></li>
+<li><p>Migrated from existing classes.</p>
+<p>These classes are available as identity classes when preview features
+are disabled. There's no plan to introduce completely new value
+classes.</p></li>
+</ol>
+<p>Support for other value classes would require significant changes to
+the build system.</p>
+<h2 id="testing">Testing</h2>
+<p>In addition to tests that require preview features to be enabled,
+tests that do not depend on preview features wish to run with preview
+features enabled to ensure compatibility:</p>
+<ol type="1">
+<li><p>Some tests wish to run against the Java SE class library with
+value classes.</p>
+<p>The jtreg tests may be run with
+<code>JTREG=VM_OPTIONS=--enable-preview</code>.</p></li>
+<li><p>Some tests wish to run against their own classes migrated to
+value classes.</p>
+<p>The jtreg <a
+href="testing.html#VALUE_CLASS_PLUGIN">VALUE_CLASS_PLUGIN</a> allows
+tests to migrate their own classes to value classes when running with
+the plugin.</p></li>
+</ol>
+<h2 id="wrapper-class-caches">Wrapper Class Caches</h2>
+<p>Currently, wrapper class caches are retained even when preview
+features are enabled to address performance losses. They have no
+semantic impact to value objects.</p>
+<p>In interpreter or C1 execution in Hotspot, allocations of a value
+object to the heap as a full object with header happen when a value
+object is:</p>
+<ol type="1">
+<li>Loaded from a flat storage (field or array)</li>
+<li>Created by a constructor</li>
+<li>If C2 uses scalarized calling convention, at C2 to C1/interpreter
+calls and returns</li>
+</ol>
+<p>Ideally, C2 can eliminate such allocations, but this does not work if
+the resulting object is stored into references. Unfortunately, many uses
+of boxing conversions store the resulting wrapper objects as
+references.</p>
+<p>For the uses that store wrapper objects to references, if the boxing
+conversion is:</p>
+<ol type="1">
+<li>Returning a value object from a flat cache array</li>
+<li>Calling the value class constructor</li>
+</ol>
+<p>Then we would have heap allocation on every single use.</p>
+<p>To avoid the allocations, we fall back to returning a value object
+from a reference cache array, from which the loaded reference is
+directly storable into a destination that wants a reference without any
+allocation.</p>
+<p>Since Hotspot may create flat arrays if an array of value objects is
+requested by regular Java array creation mechanisms, we use
+<code>ValueClass.newReferenceArray</code> to ensure we always create a
+reference cache array.</p>
+<p>The cache array for value objects may be removed without notice if
+the performance losses from allocations are no longer significant.</p>
+<h2 id="editing-this-document">Editing This Document</h2>
+<p>If you want to contribute changes to this document, edit
+<code>doc/value-class-preview.md</code> and then run
+<code>make update-build-docs</code> to generate the same changes in
+<code>doc/value-class-preview.html</code>.</p>
+</body>
+</html>

doc/value-class-preview.md

@@ -0,0 +1,151 @@
+% Migration of JDK Classes to Value Classes
+
+## Introduction
+
+The Value Objects feature introduces value objects and migrates suitable classes
+to value classes. This means that when preview features are enabled, different
+class files are used for the migrated classes in the Java class library.
+
+To accomplish this, a built JDK uses *preview-specific* files in `META-INF/preview`,
+which overrides the regular files of the same name. For example,
+`META-INF/preview/java/lang/Integer.class` overrides `java/lang/Integer.class`.
+
+The JDK generates preview-specific source files (they may use preview language
+features), compiles class files from them, and distributes these class files in
+`META-INF/preview`.
+
+## The Build Process
+
+### The Custom Handling for the Value Objects JEP
+
+The Value Objects JEP requires a few select classes in the `java.base` module
+to become value classes when preview features are enabled.
+
+The build of `java.base` module first creates the source code of those value
+classes, done in
+[`GensrcValueClasses.gmk`](../make/modules/java.base/gensrc/GensrcValueClasses.gmk).
+
+1. A hardcoded list of regular source files are selected for preview-specific
+   generation.
+
+2. Extract the content of each regular source file, search for any occurrences
+   of `/*value*/ class` or `/*value*/ record`, and replace with `value class`
+   or `value record`.
+
+3. The replaced contents are written to the preview-specific generated files,
+   located in `support/gensrc-valueclasses/java.base/`.  The regular source
+   files remain unchanged in their original locations.
+
+4. The general preview source to binary build pipeline recognizes the
+   `support/gensrc-valueclasses/java.base/` directory as where the `java.base`
+   module places its preview-specific source files.
+
+### The General Preview Source to Binary Pipeline
+
+Once the preview-specific source files are ready, they are picked up by the
+build system into a fully automated pipeline handling all modules and all
+outcome images.
+
+1. The `GENERATED_PREVIEW_SUBDIRS` variable in [`make/common/Modules.gmk`](../make/common/Modules.gmk)
+   indicates where the source files are found.
+
+2. For each module that has preview-specific source files, a goal is created
+   to compile these source files into class files.
+
+3. The class files from each of these tasks reside in `support/preview/<module>`
+   for each module.
+
+4. These preview-specific class files and other resources are copied to the
+   `META-INF/preview` directory of the regular output directory.
+
+5. At run-time, jimage will pick up the preview-specific overrides from
+   `META-INF/preview` only when preview features are enabled.
+
+6. The interim javac used by the build system cannot pick up the
+   preview-specific overrides; they must be supplied explicitly with the
+   following javac flag for every single module where overrides are significant:
+
+   ```
+   --patch-module <module>=$(SUPPORT_OUTPUTDIR)/preview/<module>
+   ```
+
+   See [`BuildMicroBenchmarks.gmk`](../make/test/BuildMicrobenchmark.gmk) for an example.
+
+### Non-Goals
+
+The Value Objects JEP only plans to introduce value classes that are:
+
+1. In the `java.base` module.
+
+   There's no plan to migrate other classes in other modules.
+
+2. Migrated from existing classes.
+
+   These classes are available as identity classes when preview features are
+   disabled. There's no plan to introduce completely new value classes.
+
+Support for other value classes would require significant changes to the build
+system.
+
+## Testing
+
+In addition to tests that require preview features to be enabled, tests that do
+not depend on preview features wish to run with preview features enabled to
+ensure compatibility:
+
+1. Some tests wish to run against the Java SE class library with value classes.
+
+   The jtreg tests may be run with `JTREG=VM_OPTIONS=--enable-preview`.
+
+2. Some tests wish to run against their own classes migrated to value classes.
+
+   The jtreg [VALUE_CLASS_PLUGIN](testing.html#VALUE_CLASS_PLUGIN) allows tests
+   to migrate their own classes to value classes when running with the plugin.
+
+## Wrapper Class Caches
+
+Currently, wrapper class caches are retained even when preview features are
+enabled to address performance losses. They have no semantic impact to value
+objects.
+
+In interpreter or C1 execution in Hotspot, allocations of a value object to the
+heap as a full object with header happen when a value object is:
+
+1. Loaded from a flat storage (field or array)
+2. Created by a constructor
+3. If C2 uses scalarized calling convention, at C2 to C1/interpreter calls and returns
+
+Ideally, C2 can eliminate such allocations, but this does not work if the
+resulting object is stored into references. Unfortunately, many uses of boxing
+conversions store the resulting wrapper objects as references.
+
+For the uses that store wrapper objects to references, if the boxing
+conversion is:
+
+1. Returning a value object from a flat cache array
+2. Calling the value class constructor
+
+Then we would have heap allocation on every single use.
+
+To avoid the allocations, we fall back to returning a value object from a
+reference cache array, from which the loaded reference is directly storable
+into a destination that wants a reference without any allocation.
+
+Since Hotspot may create flat arrays if an array of value objects is requested
+by regular Java array creation mechanisms, we use `ValueClass.newReferenceArray`
+to ensure we always create a reference cache array.
+
+The cache array for value objects may be removed without notice if the
+performance losses from allocations are no longer significant.
+
+## Editing This Document
+
+If you want to contribute changes to this document, edit `doc/value-class-preview.md`
+and then run `make update-build-docs` to generate the same changes in
+`doc/value-class-preview.html`.
+
+---
+# Override styles from the base CSS file that are not ideal for this document.
+header-includes:
+ - '<style type="text/css">pre, code, tt { color: #1d6ae5; }</style>'
+---

make/Bundles.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2016, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2016, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -410,27 +410,6 @@ endif
 
 ################################################################################
 
-ifneq ($(filter static-libs-graal-bundles, $(MAKECMDGOALS)), )
-  STATIC_LIBS_GRAAL_BUNDLE_FILES := $(call FindFiles, $(STATIC_LIBS_GRAAL_IMAGE_DIR))
-
-  ifeq ($(OPENJDK_TARGET_OS)-$(DEBUG_LEVEL), macosx-release)
-    STATIC_LIBS_GRAAL_BUNDLE_SUBDIR := $(JDK_MACOSX_CONTENTS_SUBDIR)/Home
-  else
-    STATIC_LIBS_GRAAL_BUNDLE_SUBDIR := $(JDK_BUNDLE_SUBDIR)
-  endif
-
-  $(eval $(call SetupBundleFile, BUILD_STATIC_LIBS_GRAAL_BUNDLE, \
-      BUNDLE_NAME := $(STATIC_LIBS_GRAAL_BUNDLE_NAME), \
-      FILES := $(STATIC_LIBS_GRAAL_BUNDLE_FILES), \
-      BASE_DIRS := $(STATIC_LIBS_GRAAL_IMAGE_DIR), \
-      SUBDIR := $(STATIC_LIBS_GRAAL_BUNDLE_SUBDIR), \
-  ))
-
-  STATIC_LIBS_GRAAL_TARGETS += $(BUILD_STATIC_LIBS_GRAAL_BUNDLE)
-endif
-
-#################################################################################
-
 ifneq ($(filter static-jdk-bundles, $(MAKECMDGOALS)), )
   STATIC_JDK_BUNDLE_FILES := $(call FindFiles, $(STATIC_JDK_IMAGE_DIR))
 
@@ -453,13 +432,12 @@ docs-jdk-bundles: $(DOCS_JDK_TARGETS)
 docs-javase-bundles: $(DOCS_JAVASE_TARGETS)
 docs-reference-bundles: $(DOCS_REFERENCE_TARGETS)
 static-libs-bundles: $(STATIC_LIBS_TARGETS)
-static-libs-graal-bundles: $(STATIC_LIBS_GRAAL_TARGETS)
 static-jdk-bundles: $(STATIC_JDK_TARGETS)
 jcov-bundles: $(JCOV_TARGETS)
 
 .PHONY: product-bundles test-bundles \
     docs-jdk-bundles docs-javase-bundles docs-reference-bundles \
-    static-libs-bundles static-libs-graal-bundles static-jdk-bundles jcov-bundles
+    static-libs-bundles static-jdk-bundles jcov-bundles
 
 ################################################################################
 

make/CompileDemos.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -173,41 +173,41 @@ $(BUILD_DEMO_CodePointIM_JAR): $(CODEPOINT_METAINF_SERVICE_FILE)
 
 $(eval $(call SetupBuildDemo, FileChooserDemo, \
     DEMO_SUBDIR := jfc, \
-    DISABLED_WARNINGS := rawtypes deprecation unchecked this-escape, \
+    DISABLED_WARNINGS := this-escape, \
 ))
 
 $(eval $(call SetupBuildDemo, SwingSet2, \
     DEMO_SUBDIR := jfc, \
     EXTRA_COPY_TO_JAR := .java, \
     EXTRA_MANIFEST_ATTR := SplashScreen-Image: resources/images/splash.png, \
-    DISABLED_WARNINGS := rawtypes deprecation unchecked static serial cast this-escape, \
+    DISABLED_WARNINGS := rawtypes static serial cast this-escape, \
 ))
 
 $(eval $(call SetupBuildDemo, Font2DTest, \
-    DISABLED_WARNINGS := rawtypes deprecation unchecked serial cast this-escape dangling-doc-comments, \
+    DISABLED_WARNINGS := serial dangling-doc-comments, \
     DEMO_SUBDIR := jfc, \
 ))
 
 $(eval $(call SetupBuildDemo, J2Ddemo, \
     DEMO_SUBDIR := jfc, \
     MAIN_CLASS := java2d.J2Ddemo, \
-    DISABLED_WARNINGS := rawtypes deprecation unchecked cast lossy-conversions this-escape, \
+    DISABLED_WARNINGS := cast lossy-conversions this-escape, \
     JAR_NAME := J2Ddemo, \
 ))
 
 $(eval $(call SetupBuildDemo, Metalworks, \
-    DISABLED_WARNINGS := rawtypes unchecked this-escape, \
+    DISABLED_WARNINGS := this-escape, \
     DEMO_SUBDIR := jfc, \
 ))
 
 $(eval $(call SetupBuildDemo, Notepad, \
-    DISABLED_WARNINGS := rawtypes this-escape, \
+    DISABLED_WARNINGS := this-escape, \
     DEMO_SUBDIR := jfc, \
 ))
 
 $(eval $(call SetupBuildDemo, Stylepad, \
     DEMO_SUBDIR := jfc, \
-    DISABLED_WARNINGS := rawtypes unchecked this-escape, \
+    DISABLED_WARNINGS := this-escape, \
     EXTRA_SRC_DIR := $(DEMO_SHARE_SRC)/jfc/Notepad, \
     EXCLUDE_FILES := $(DEMO_SHARE_SRC)/jfc/Notepad/README.txt, \
 ))
@@ -217,7 +217,7 @@ $(eval $(call SetupBuildDemo, SampleTree, \
 ))
 
 $(eval $(call SetupBuildDemo, TableExample, \
-    DISABLED_WARNINGS := rawtypes unchecked deprecation this-escape dangling-doc-comments, \
+    DISABLED_WARNINGS := dangling-doc-comments, \
     DEMO_SUBDIR := jfc, \
 ))
 

make/CompileInterimLangtools.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2014, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2014, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -68,17 +68,19 @@ java.compiler.interim_EXTRA_FILES := \
 TARGETS += $(BUILDTOOLS_OUTPUTDIR)/gensrc/java.compiler.interim/javax/tools/ToolProvider.java
 
 ################################################################################
-# Use the up-to-date PreviewFeature.java and NoPreview.java from the current
-# sources, instead of the versions from the boot JDK, as javac may be referring
-# to constants from the up-to-date versions.
+# Create a hybrid PreviewFeature.java that combines constants
+# from the current sources, as those can be used in javac APIs,  and from the
+# bootstrap JDK, as those can be used from bootstrap JDK classfiles.
 
-$(eval $(call SetupCopyFiles, COPY_PREVIEW_FEATURES, \
-    FILES := $(TOPDIR)/src/java.base/share/classes/jdk/internal/javac/PreviewFeature.java \
-        $(TOPDIR)/src/java.base/share/classes/jdk/internal/javac/NoPreview.java, \
-    DEST := $(BUILDTOOLS_OUTPUTDIR)/gensrc/java.base.interim/jdk/internal/javac/, \
-))
+$(BUILDTOOLS_OUTPUTDIR)/gensrc/java.base.interim/jdk/internal/javac/PreviewFeature.java: \
+    $(TOPDIR)/src/java.base/share/classes/jdk/internal/javac/PreviewFeature.java
+	$(call LogInfo, Generating $@)
+	$(JAVA) $(TOPDIR)/make/langtools/tools/previewfeature/SetupPreviewFeature.java \
+            $(TOPDIR)/src/java.base/share/classes/jdk/internal/javac/PreviewFeature.java \
+            $@
 
-TARGETS += $(COPY_PREVIEW_FEATURES)
+
+TARGETS += $(BUILDTOOLS_OUTPUTDIR)/gensrc/java.base.interim/jdk/internal/javac/PreviewFeature.java
 
 ################################################################################
 # Setup the rules to build interim langtools, which is compiled by the boot
@@ -123,7 +125,8 @@ define SetupInterimModule
   $1_DEPS_INTERIM := $$(addsuffix .interim, $$(filter \
       $$(INTERIM_LANGTOOLS_BASE_MODULES), $$(call FindTransitiveDepsForModule, $1)))
 
-  $$(BUILD_$1.interim): $$(foreach d, $$($1_DEPS_INTERIM), $$(BUILD_$$d)) $(COPY_PREVIEW_FEATURES)
+  $$(BUILD_$1.interim): $$(foreach d, $$($1_DEPS_INTERIM), $$(BUILD_$$d)) \
+      $(BUILDTOOLS_OUTPUTDIR)/gensrc/java.base.interim/jdk/internal/javac/PreviewFeature.java
 
   TARGETS += $$(BUILD_$1.interim)
 endef

make/CompileJavaModules.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2014, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2014, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -30,6 +30,8 @@ include MakeFileStart.gmk
 include JavaCompilation.gmk
 include Modules.gmk
 
+include CopyFiles.gmk
+
 ################################################################################
 # If this is an imported module that has prebuilt classes, only compile
 # module-info.java.
@@ -98,13 +100,15 @@ endif
 ################################################################################
 # Setup the main compilation
 
+COMPILATION_OUTPUTDIR := $(if $($(MODULE)_BIN), $($(MODULE)_BIN), $(JDK_OUTPUTDIR)/modules)
+
 $(eval $(call SetupJavaCompilation, $(MODULE), \
     SMALL_JAVA := false, \
     MODULE := $(MODULE), \
     SRC := $(wildcard $(MODULE_SRC_DIRS)), \
     INCLUDES := $(JDK_USER_DEFINED_FILTER), \
     FAIL_NO_SRC := $(FAIL_NO_SRC), \
-    BIN := $(if $($(MODULE)_BIN), $($(MODULE)_BIN), $(JDK_OUTPUTDIR)/modules), \
+    BIN := $(COMPILATION_OUTPUTDIR), \
     HEADERS := $(SUPPORT_OUTPUTDIR)/headers, \
     CREATE_API_DIGEST := true, \
     CLEAN := $(CLEAN), \
@@ -126,6 +130,66 @@ $(eval $(call SetupJavaCompilation, $(MODULE), \
 
 TARGETS += $($(MODULE))
 
+################################################################################
+# Setup compilation for preview classes in the module
+# TBD: When $(DOCLINT) was included there was an NPE in JavacTypes.getOverriddenMethods
+
+# Directory and file name suffix for jar file containing preview classes/resources.
+PREVIEW_CLASSES_LABEL := preview
+# Module relative path in which preview classes/resources are placed.
+PREVIEW_PATH := META-INF/preview
+
+MODULE_PREVIEW_SRC_DIRS := $(call FindModulePreviewSrcDirs, $(MODULE))
+MODULE_PREVIEW_SOURCEPATH := $(call GetModulePreviewSrcPath)
+ifneq ($(MODULE_PREVIEW_SRC_DIRS),)
+  # Compile preview classes into a separate directory, and then copy into the
+  # correct output path location. We cannot compile directly into the desired
+  # directory because it's the compiler which creates the original
+  # '<module>/<classpath>/...' hierarchy.
+  PREVIEW_OUTPUTDIR := $(SUPPORT_OUTPUTDIR)/$(PREVIEW_CLASSES_LABEL)
+  PATCH_COMMAND := $(MODULE)=$(call strip, $(COMPILATION_OUTPUTDIR)/$(MODULE))
+
+  $(eval $(call SetupJavaCompilation, $(MODULE)-$(PREVIEW_CLASSES_LABEL), \
+      SMALL_JAVA := false, \
+      MODULE := $(MODULE), \
+      SRC := $(wildcard $(MODULE_PREVIEW_SRC_DIRS)), \
+      INCLUDES := $(JDK_USER_DEFINED_FILTER), \
+      FAIL_NO_SRC := $(FAIL_NO_SRC), \
+      BIN := $(PREVIEW_OUTPUTDIR)/, \
+      DISABLED_WARNINGS := $(DISABLED_WARNINGS_java) preview, \
+      EXCLUDES := $(EXCLUDES), \
+      EXCLUDE_FILES := $(EXCLUDE_FILES), \
+      KEEP_ALL_TRANSLATIONS := $(KEEP_ALL_TRANSLATIONS), \
+      DEPENDS := $($(MODULE)), \
+      JAVAC_FLAGS := \
+          $(JAVAC_FLAGS) \
+          --module-source-path $(MODULE_PREVIEW_SOURCEPATH) \
+          --module-path $(MODULEPATH) \
+          --patch-module $(PATCH_COMMAND) \
+          --system none \
+          --enable-preview -source $(JDK_SOURCE_TARGET_VERSION), \
+  ))
+
+  # Don't add '$($(MODULE)-$(PREVIEW_CLASSES_LABEL))' to TARGETS (it's transient).
+  # The 'preview' target below depends on it, and that's the non-transient
+  # result we care about.
+
+  # Copy compiled output from "$(PREVIEW_OUTPUTDIR)/$(MODULE)/<classpath>/..."
+  # to "$(COMPILATION_OUTPUTDIR)/$(MODULE)/$(PREVIEW_PATH)/<classpath>/...".
+  MOD_SRC := $(PREVIEW_OUTPUTDIR)/$(MODULE)
+  MOD_DST := $(COMPILATION_OUTPUTDIR)/$(MODULE)
+
+  # NOTE: We cannot use '$(CP) -R $(MOD_SRC)/*/ ...' to select sub-directories (it
+  # does not work on MacOS/BSD). Use 'filter-out' to explicitly exclude marker files.
+  $(MOD_DST)/_the.$(MODULE).preview: $($(MODULE)-$(PREVIEW_CLASSES_LABEL))
+		$(RM) -r $(@D)/$(PREVIEW_PATH)
+		$(MKDIR) -p $(@D)/$(PREVIEW_PATH)
+		$(CP) -R $(filter-out $(MOD_SRC)/_%, $(wildcard $(MOD_SRC)/*)) $(@D)/$(PREVIEW_PATH)
+		$(TOUCH) $@
+
+  TARGETS += $(MOD_DST)/_the.$(MODULE).preview
+endif
+
 # Declare dependencies between java compilations of different modules.
 # Since the other modules are declared in different invocations of this file,
 # use the macro to find the correct target file to depend on.

make/Docs.gmk

@@ -1,4 +1,4 @@
-# Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 1997, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -93,19 +93,17 @@ JAVADOC_DISABLED_DOCLINT_WARNINGS := missing
 JAVADOC_DISABLED_DOCLINT_PACKAGES := org.w3c.* javax.smartcardio
 
 # The initial set of options for javadoc
-# -XDaccessInternalAPI is a temporary workaround, see 8373909
-JAVADOC_OPTIONS := -use -keywords -notimestamp \
+JAVADOC_OPTIONS := -XDignore.symbol.file=true -use -keywords -notimestamp \
     -serialwarn -encoding utf-8 -docencoding utf-8 -breakiterator \
     -splitIndex --system none -javafx --expand-requires transitive \
-    --override-methods=summary \
-    -XDaccessInternalAPI
+    --enable-preview -source $(JDK_SOURCE_TARGET_VERSION) \
+    --override-methods=summary
 
 # The reference options must stay stable to allow for comparisons across the
 # development cycle.
 REFERENCE_OPTIONS := -XDignore.symbol.file=true -use -keywords -notimestamp \
     -serialwarn -encoding utf-8 -breakiterator -splitIndex --system none \
-    -html5 -javafx --expand-requires transitive \
-    -XDaccessInternalAPI
+    -html5 -javafx --expand-requires transitive
 
 # Should we add DRAFT stamps to the generated javadoc?
 ifeq ($(VERSION_IS_GA), true)

make/GenerateLinkOptData.gmk

@@ -70,12 +70,15 @@ CLASSLIST_FILE_VM_OPTS = \
 
 # Save the stderr output of the command and print it along with stdout in case
 # something goes wrong.
+# The classlists must be generated with -Xint to avoid non-determinism
+# introduced by JIT compiled code
 $(CLASSLIST_FILE): $(INTERIM_IMAGE_DIR)/bin/java$(EXECUTABLE_SUFFIX) $(CLASSLIST_JAR)
 	$(call MakeDir, $(LINK_OPT_DIR))
 	$(call LogInfo, Generating $(patsubst $(OUTPUTDIR)/%, %, $@))
 	$(call LogInfo, Generating $(patsubst $(OUTPUTDIR)/%, %, $(JLI_TRACE_FILE)))
 	$(FIXPATH) $(INTERIM_IMAGE_DIR)/bin/java -XX:DumpLoadedClassList=$@.raw \
 	    $(CLASSLIST_FILE_VM_OPTS) \
+	    -Xint \
 	    -Xlog:aot=off \
 	    -Xlog:cds=off \
 	    -cp $(SUPPORT_OUTPUTDIR)/classlist.jar \
@@ -90,6 +93,7 @@ $(CLASSLIST_FILE): $(INTERIM_IMAGE_DIR)/bin/java$(EXECUTABLE_SUFFIX) $(CLASSLIST
 	    -XX:SharedClassListFile=$@.interim -XX:SharedArchiveFile=$@.jsa \
 	    -Djava.lang.invoke.MethodHandle.TRACE_RESOLVE=true \
 	    $(CLASSLIST_FILE_VM_OPTS) \
+	    -Xint \
 	    --module-path $(SUPPORT_OUTPUTDIR)/classlist.jar \
 	    -Xlog:aot=off \
 	    -Xlog:cds=off \

make/GraalBuilderImage.gmk

@@ -1,52 +0,0 @@
-#
-# Copyright (c) 2020, Red Hat Inc.
-# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
-#
-# This code is free software; you can redistribute it and/or modify it
-# under the terms of the GNU General Public License version 2 only, as
-# published by the Free Software Foundation.  Oracle designates this
-# particular file as subject to the "Classpath" exception as provided
-# by Oracle in the LICENSE file that accompanied this code.
-#
-# This code is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-# version 2 for more details (a copy is included in the LICENSE file that
-# accompanied this code).
-#
-# You should have received a copy of the GNU General Public License version
-# 2 along with this work; if not, write to the Free Software Foundation,
-# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
-#
-# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
-# or visit www.oracle.com if you need additional information or have any
-# questions.
-#
-
-include MakeFileStart.gmk
-
-################################################################################
-# This makefile creates a jdk image overlaid with statically linked core
-# libraries.
-################################################################################
-
-include CopyFiles.gmk
-
-$(eval $(call SetupCopyFiles, COPY_JDK_IMG, \
-      SRC := $(JDK_IMAGE_DIR)/, \
-      DEST := $(GRAAL_BUILDER_IMAGE_DIR)/, \
-      FILES := $(call FindFiles, $(JDK_IMAGE_DIR)/), \
-))
-TARGETS += $(COPY_JDK_IMG)
-
-$(eval $(call SetupCopyFiles, COPY_STATIC_LIBS, \
-      SRC := $(STATIC_LIBS_GRAAL_IMAGE_DIR)/lib, \
-      DEST := $(GRAAL_BUILDER_IMAGE_DIR)/lib, \
-      FILES := $(filter %$(STATIC_LIBRARY_SUFFIX), \
-          $(call FindFiles, $(STATIC_LIBS_GRAAL_IMAGE_DIR)/lib)), \
-))
-TARGETS += $(COPY_STATIC_LIBS)
-
-################################################################################
-
-include MakeFileEnd.gmk

make/Hsdis.gmk

@@ -44,6 +44,9 @@ ifeq ($(HSDIS_BACKEND), capstone)
   else ifeq ($(call isTargetCpuArch, aarch64), true)
     CAPSTONE_ARCH := CS_ARCH_$(CAPSTONE_ARCH_AARCH64_NAME)
     CAPSTONE_MODE := CS_MODE_ARM
+  else ifeq ($(call isTargetCpuArch, arm), true)
+    CAPSTONE_ARCH := CS_ARCH_ARM
+    CAPSTONE_MODE := CS_MODE_ARM
   else
     $(error No support for Capstone on this platform)
   endif

make/Images.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2014, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2014, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -137,23 +137,23 @@ CDS_DUMP_FLAGS = -Xmx128M -Xms128M
 # Helper function for creating the CDS archives for the JDK and JRE
 #
 # Param1 - VM variant (e.g., server, client, zero, ...)
-# Param2 - _nocoops, _coh, _nocoops_coh, or empty
+# Param2 - _nocoops, _nocoh, _nocoops_nocoh, or empty
+# Param3 - _preview, or empty
 define CreateCDSArchive
   $1_$2_COOPS_OPTION := $(if $(findstring _nocoops, $2),-XX:-UseCompressedOops)
   # enable and also explicitly disable coh as needed.
   ifeq ($(call isTargetCpuBits, 64), true)
-    $1_$2_COH_OPTION := -XX:+UnlockExperimentalVMOptions \
-                        $(if $(findstring _coh, $2),-XX:+UseCompactObjectHeaders,-XX:-UseCompactObjectHeaders)
+    $1_$2_NOCOH_OPTION := $(if $(findstring _nocoh, $2),-XX:-UseCompactObjectHeaders,-XX:+UseCompactObjectHeaders)
   endif
-  $1_$2_DUMP_EXTRA_ARG := $$($1_$2_COOPS_OPTION) $$($1_$2_COH_OPTION)
-  $1_$2_DUMP_TYPE      := $(if $(findstring _nocoops, $2),-NOCOOPS,)$(if $(findstring _coh, $2),-COH,)
+  $1_$2_$3_DUMP_EXTRA_ARG := $$($1_$2_COOPS_OPTION) $$($1_$2_NOCOH_OPTION) $(if $(findstring _preview, $3), --enable-preview,)
+  $1_$2_$3_DUMP_TYPE      := $(if $(findstring _nocoops, $2),-NOCOOPS,)$(if $(findstring _nocoh, $2),-NOCOH,)$(if $(findstring _preview, $3),-PREVIEW,)
 
-  $1_$2_CDS_DUMP_FLAGS := $(CDS_DUMP_FLAGS) $(if $(filter g1gc, $(JVM_FEATURES_$1)), -XX:+UseG1GC)
+  $1_$2_$3_CDS_DUMP_FLAGS := $(CDS_DUMP_FLAGS) $(if $(filter g1gc, $(JVM_FEATURES_$1)), -XX:+UseG1GC)
 
   ifeq ($(OPENJDK_TARGET_OS), windows)
-    $1_$2_CDS_ARCHIVE := bin/$1/classes$2.jsa
+    $1_$2_$3_CDS_ARCHIVE := bin/$1/classes$2$3.jsa
   else
-    $1_$2_CDS_ARCHIVE := lib/$1/classes$2.jsa
+    $1_$2_$3_CDS_ARCHIVE := lib/$1/classes$2$3.jsa
   endif
 
   ifneq ($(COMPARE_BUILD), )
@@ -161,53 +161,83 @@ define CreateCDSArchive
   endif
 
   ifeq ($(DEBUG_CDS_ARCHIVE), true)
-    $1_$2_CDS_DUMP_FLAGS += -Xlog:aot+map*=trace:file=$$(JDK_IMAGE_DIR)/$$($1_$2_CDS_ARCHIVE).cdsmap:none:filesize=0
+    $1_$2_$3_CDS_DUMP_FLAGS += -Xlog:aot+map*=trace:file=$$(JDK_IMAGE_DIR)/$$($1_$2_$3_CDS_ARCHIVE).cdsmap:none:filesize=0
   endif
 
-  $$(eval $$(call SetupExecute, $1_$2_gen_cds_archive_jdk, \
-      WARN := Creating CDS$$($1_$2_DUMP_TYPE) archive for jdk image for $1, \
-      INFO := Using CDS flags for $1: $$($1_$2_CDS_DUMP_FLAGS), \
+  $$(eval $$(call SetupExecute, $1_$2_$3_gen_cds_archive_jdk, \
+      WARN := Creating CDS$$($1_$2_$3_DUMP_TYPE) archive for jdk image for $1, \
+      INFO := Using CDS flags for $1: $$($1_$2_$3_CDS_DUMP_FLAGS), \
       DEPS := $$(jlink_jdk), \
-      OUTPUT_FILE := $$(JDK_IMAGE_DIR)/$$($1_$2_CDS_ARCHIVE), \
+      OUTPUT_FILE := $$(JDK_IMAGE_DIR)/$$($1_$2_$3_CDS_ARCHIVE), \
       SUPPORT_DIR := $$(JDK_IMAGE_SUPPORT_DIR), \
       COMMAND := $$(FIXPATH) $$(JDK_IMAGE_DIR)/bin/java -Xshare:dump \
-          -XX:SharedArchiveFile=$$(JDK_IMAGE_DIR)/$$($1_$2_CDS_ARCHIVE) \
-          -$1 $$($1_$2_DUMP_EXTRA_ARG) $$($1_$2_CDS_DUMP_FLAGS) $$(LOG_INFO), \
+          -XX:SharedArchiveFile=$$(JDK_IMAGE_DIR)/$$($1_$2_$3_CDS_ARCHIVE) \
+          -$1 $$($1_$2_$3_DUMP_EXTRA_ARG) $$($1_$2_$3_CDS_DUMP_FLAGS) $$(LOG_INFO), \
   ))
 
-  JDK_TARGETS += $$($1_$2_gen_cds_archive_jdk)
+  JDK_TARGETS += $$($1_$2_$3_gen_cds_archive_jdk)
 
-  $$(eval $$(call SetupExecute, $1_$2_gen_cds_archive_jre, \
-      WARN := Creating CDS$$($1_$2_DUMP_TYPE) archive for jre image for $1, \
-      INFO := Using CDS flags for $1: $$($1_$2_CDS_DUMP_FLAGS), \
+  $$(eval $$(call SetupExecute, $1_$2_$3_gen_cds_archive_jre, \
+      WARN := Creating CDS$$($1_$2_$3_DUMP_TYPE) archive for jre image for $1, \
+      INFO := Using CDS flags for $1: $$($1_$2_$3_CDS_DUMP_FLAGS), \
       DEPS := $$(jlink_jre), \
-      OUTPUT_FILE := $$(JRE_IMAGE_DIR)/$$($1_$2_CDS_ARCHIVE), \
+      OUTPUT_FILE := $$(JRE_IMAGE_DIR)/$$($1_$2_$3_CDS_ARCHIVE), \
       SUPPORT_DIR := $$(JRE_IMAGE_SUPPORT_DIR), \
       COMMAND := $$(FIXPATH) $$(JRE_IMAGE_DIR)/bin/java -Xshare:dump \
-          -XX:SharedArchiveFile=$$(JRE_IMAGE_DIR)/$$($1_$2_CDS_ARCHIVE) \
-          -$1 $$($1_$2_DUMP_EXTRA_ARG) $$($1_$2_CDS_DUMP_FLAGS) $$(LOG_INFO), \
+          -XX:SharedArchiveFile=$$(JRE_IMAGE_DIR)/$$($1_$2_$3_CDS_ARCHIVE) \
+          -$1 $$($1_$2_$3_DUMP_EXTRA_ARG) $$($1_$2_$3_CDS_DUMP_FLAGS) $$(LOG_INFO), \
   ))
 
-  JRE_TARGETS += $$($1_$2_gen_cds_archive_jre)
+  JRE_TARGETS += $$($1_$2_$3_gen_cds_archive_jre)
 endef
 
 ifeq ($(BUILD_CDS_ARCHIVE), true)
   $(foreach v, $(JVM_VARIANTS), \
-    $(eval $(call CreateCDSArchive,$v,)) \
+    $(eval $(call CreateCDSArchive,$v,,)) \
   )
 
-  ifeq ($(call isTargetCpuBits, 64), true)
+  ifeq ($(BUILD_CDS_ARCHIVE_PREVIEW), true)
     $(foreach v, $(JVM_VARIANTS), \
-      $(eval $(call CreateCDSArchive,$v,_nocoops)) \
+      $(eval $(call CreateCDSArchive,$v,,_preview)) \
     )
-    ifeq ($(BUILD_CDS_ARCHIVE_COH), true)
+  endif
+
+  ifeq ($(call isTargetCpuBits, 64), true)
+    ifeq ($(BUILD_CDS_ARCHIVE_NOCOOPS), true)
       $(foreach v, $(JVM_VARIANTS), \
-        $(eval $(call CreateCDSArchive,$v,_coh)) \
+        $(eval $(call CreateCDSArchive,$v,_nocoops,)) \
       )
+    endif
+
+    ifeq ($(BUILD_CDS_ARCHIVE_PREVIEW)+$(BUILD_CDS_ARCHIVE_NOCOOPS), true+true)
       $(foreach v, $(JVM_VARIANTS), \
-        $(eval $(call CreateCDSArchive,$v,_nocoops_coh)) \
+        $(eval $(call CreateCDSArchive,$v,_nocoops,_preview)) \
       )
     endif
+
+    ifeq ($(BUILD_CDS_ARCHIVE_NOCOH), true)
+      $(foreach v, $(JVM_VARIANTS), \
+        $(eval $(call CreateCDSArchive,$v,_nocoh)) \
+      )
+
+      ifeq ($(BUILD_CDS_ARCHIVE_PREVIEW), true)
+        $(foreach v, $(JVM_VARIANTS), \
+          $(eval $(call CreateCDSArchive,$v,_nocoh,_preview)) \
+        )
+      endif
+
+      ifeq ($(BUILD_CDS_ARCHIVE_NOCOOPS), true)
+        $(foreach v, $(JVM_VARIANTS), \
+          $(eval $(call CreateCDSArchive,$v,_nocoops_nocoh)) \
+        )
+      endif
+
+      ifeq ($(BUILD_CDS_ARCHIVE_PREVIEW)+$(BUILD_CDS_ARCHIVE_NOCOOPS), true+true)
+        $(foreach v, $(JVM_VARIANTS), \
+          $(eval $(call CreateCDSArchive,$v,_nocoops_nocoh,_preview)) \
+        )
+      endif
+    endif
   endif
 endif
 

make/Main.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -478,11 +478,6 @@ $(eval $(call SetupTarget, static-libs-image, \
     TARGET := static-libs-image, \
 ))
 
-$(eval $(call SetupTarget, static-libs-graal-image, \
-    MAKEFILE := StaticLibsImage, \
-    TARGET := static-libs-graal-image, \
-))
-
 $(eval $(call SetupTarget, mac-jdk-bundle, \
     MAKEFILE := MacBundles, \
     TARGET := jdk-bundle, \
@@ -506,11 +501,6 @@ $(eval $(call SetupTarget, exploded-image-optimize, \
         buildtools-modules, \
 ))
 
-$(eval $(call SetupTarget, graal-builder-image, \
-    MAKEFILE := GraalBuilderImage, \
-    DEPS := jdk-image static-libs-graal-image, \
-))
-
 ifeq ($(JCOV_ENABLED), true)
   $(eval $(call SetupTarget, jcov-image, \
       MAKEFILE := Coverage, \
@@ -804,6 +794,20 @@ ifeq ($(BUILD_JTREG_TEST_THREAD_FACTORY), true)
   ))
 endif
 
+# Builds the value class plugin jtreg extension (JEP 401)
+$(eval $(call SetupTarget, build-test-value-class-plugin, \
+    MAKEFILE := test/BuildJtregValueClassPlugin, \
+    TARGET := build, \
+    DEPS := interim-langtools exploded-image, \
+))
+
+# Copies the value class plugin into the test image
+$(eval $(call SetupTarget, test-image-value-class-plugin, \
+    MAKEFILE := test/BuildJtregValueClassPlugin, \
+    TARGET := images, \
+    DEPS := build-test-value-class-plugin, \
+))
+
 $(eval $(call SetupTarget, build-microbenchmark, \
     MAKEFILE := test/BuildMicrobenchmark, \
     DEPS := interim-langtools exploded-image build-test-lib, \
@@ -877,12 +881,6 @@ $(eval $(call SetupTarget, static-libs-bundles, \
     DEPS := static-libs-image, \
 ))
 
-$(eval $(call SetupTarget, static-libs-graal-bundles, \
-    MAKEFILE := Bundles, \
-    TARGET := static-libs-graal-bundles, \
-    DEPS := static-libs-graal-image, \
-))
-
 $(eval $(call SetupTarget, static-jdk-bundles, \
     MAKEFILE := Bundles, \
     TARGET := static-jdk-bundles, \
@@ -1124,8 +1122,6 @@ else
 
   static-libs-image: hotspot-static-libs static-libs
 
-  static-libs-graal-image: static-libs
-
   bootcycle-images: jdk-image
 
   docs-jdk-api-javadoc: $(GENSRC_TARGETS)
@@ -1328,6 +1324,8 @@ ifeq ($(BUILD_JTREG_TEST_THREAD_FACTORY), true)
   test-image: test-image-test-thread-factory
 endif
 
+test-image: test-image-value-class-plugin
+
 ifneq ($(JMH_CORE_JAR), )
   test-image: build-microbenchmark
 endif
@@ -1422,6 +1420,9 @@ clean: $(CLEAN_DIR_TARGETS)
 clean-docs:
 	$(call CleanDocs)
 
+clean-microbenchmark:
+	$(call CleanMicrobenchmark)
+
 clean-compile-commands:
 	$(call CleanMakeSupportDir,compile-commands)
 
@@ -1470,7 +1471,8 @@ dist-clean: clean
 	)
 	$(ECHO) Cleaned everything, you will have to re-run configure.
 
-ALL_TARGETS += clean clean-docs clean-compile-commands dist-clean $(CLEAN_DIR_TARGETS) \
+ALL_TARGETS += clean clean-docs clean-microbenchmark clean-compile-commands \
+    dist-clean $(CLEAN_DIR_TARGETS) \
     $(CLEAN_SUPPORT_DIR_TARGETS) $(CLEAN_TEST_TARGETS) $(CLEAN_PHASE_TARGETS) \
     $(CLEAN_MODULE_TARGETS) $(CLEAN_MODULE_PHASE_TARGETS)
 

make/MainSupport.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -65,6 +65,14 @@ define CleanDocs
 	@$(ECHO) " done"
 endef
 
+define CleanMicrobenchmark
+	@$(PRINTF) "Cleaning microbenchmark build artifacts ..."
+	@$(ECHO) "" $(LOG_DEBUG)
+	$(RM) -r $(SUPPORT_OUTPUTDIR)/test/micro
+	$(RM) -r $(TEST_IMAGE_DIR)/micro
+	@$(ECHO) " done"
+endef
+
 # Cleans the dir given as $1
 define CleanDir
 	@$(PRINTF) "Cleaning %s build artifacts ..." "$(strip $1)"
@@ -107,6 +115,7 @@ define Clean-java
 	@$(PRINTF) "Cleaning java %s..." "$(if $1,for $(strip $1) )"
 	@$(ECHO) "" $(LOG_DEBUG)
 	$(RM) -r $(JDK_OUTPUTDIR)/modules/$(strip $1)
+	$(RM) -r $(SUPPORT_OUTPUTDIR)/preview/$(strip $1)
 	$(RM) -r $(SUPPORT_OUTPUTDIR)/special_classes/$(strip $1)
 	$(ECHO) " done"
 	$(PRINTF) "Cleaning headers %s..." "$(if $1,for $(strip $1) )"

make/PreInit.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2012, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2012, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -66,7 +66,8 @@ CALLED_SPEC_TARGETS := $(filter-out $(ALL_GLOBAL_TARGETS), $(CALLED_TARGETS))
 ifeq ($(CALLED_SPEC_TARGETS), )
   SKIP_SPEC := true
 endif
-ifeq ($(findstring p, $(MAKEFLAGS))$(findstring q, $(MAKEFLAGS)), pq)
+MFLAGS_SINGLE := $(filter-out --%, $(MFLAGS))
+ifeq ($(findstring p, $(MFLAGS_SINGLE))$(findstring q, $(MFLAGS_SINGLE)), pq)
   SKIP_SPEC := true
 endif
 

make/RunTests.gmk

@@ -93,6 +93,9 @@ JTREG_FAILURE_HANDLER := $(JTREG_FAILURE_HANDLER_DIR)/jtregFailureHandler.jar
 JTREG_TEST_THREAD_FACTORY_DIR := $(TEST_IMAGE_DIR)/jtreg_test_thread_factory
 JTREG_TEST_THREAD_FACTORY_JAR := $(JTREG_TEST_THREAD_FACTORY_DIR)/jtregTestThreadFactory.jar
 
+JTREG_VALUE_CLASS_PLUGIN_DIR := $(TEST_IMAGE_DIR)/jtreg_value_class_plugin
+JTREG_VALUE_CLASS_PLUGIN_JAR := $(JTREG_VALUE_CLASS_PLUGIN_DIR)/valueClassPlugin.jar
+
 JTREG_FAILURE_HANDLER_TIMEOUT ?= 0
 
 ifneq ($(wildcard $(JTREG_FAILURE_HANDLER)), )
@@ -206,7 +209,7 @@ $(eval $(call ParseKeywordVariable, JTREG, \
     SINGLE_KEYWORDS := JOBS TIMEOUT_FACTOR FAILURE_HANDLER_TIMEOUT \
         TEST_MODE ASSERT VERBOSE RETAIN TEST_THREAD_FACTORY JVMTI_STRESS_AGENT \
         MAX_MEM RUN_PROBLEM_LISTS RETRY_COUNT REPEAT_COUNT MAX_OUTPUT REPORT \
-        AOT_JDK MANUAL $(CUSTOM_JTREG_SINGLE_KEYWORDS), \
+        AOT_JDK MANUAL VALUE_CLASS_PLUGIN $(CUSTOM_JTREG_SINGLE_KEYWORDS), \
     STRING_KEYWORDS := OPTIONS JAVA_OPTIONS VM_OPTIONS KEYWORDS \
         EXTRA_PROBLEM_LISTS LAUNCHER_OPTIONS \
         $(CUSTOM_JTREG_STRING_KEYWORDS), \
@@ -877,6 +880,20 @@ define SetupRunJtregTestBody
     ))
   endif
 
+  ifneq ($$(JTREG_VALUE_CLASS_PLUGIN), )
+    ifneq ($$(wildcard $$(JTREG_VALUE_CLASS_PLUGIN_JAR)), )
+      $1_JTREG_BASIC_OPTIONS += -cpa:$$(JTREG_VALUE_CLASS_PLUGIN_JAR)
+    endif
+    $1_JTREG_BASIC_OPTIONS += -vmoption:--enable-preview
+    $1_JTREG_BASIC_OPTIONS += -javacoption:-XDaccessInternalAPI
+    $1_JTREG_BASIC_OPTIONS += -javacoption:--source -javacoption:$(VERSION_FEATURE)
+    $1_JTREG_BASIC_OPTIONS += -javacoption:--enable-preview
+    $1_JTREG_BASIC_OPTIONS += -javacoption:-Xplugin:ValueClassPlugin
+    $1_JTREG_BASIC_OPTIONS += $$(addprefix $$(JTREG_PROBLEM_LIST_PREFIX), $$(wildcard \
+        $$(addprefix $$($1_TEST_ROOT)/, ProblemList-ValueClass.txt) \
+    ))
+  endif
+
   ifneq ($$(JTREG_JVMTI_STRESS_AGENT), )
     AGENT := $$(LIBRARY_PREFIX)JvmtiStressAgent$$(SHARED_LIBRARY_SUFFIX)=$$(JTREG_JVMTI_STRESS_AGENT)
     $1_JTREG_BASIC_OPTIONS += -javaoption:'-agentpath:$(TEST_IMAGE_DIR)/hotspot/jtreg/native/$$(AGENT)'
@@ -972,11 +989,6 @@ define SetupRunJtregTestBody
     JTREG_AUTO_PROBLEM_LISTS += ProblemList-enable-preview.txt
   endif
 
-  ifneq ($$(findstring -XX:+UseCompactObjectHeaders, $$(JTREG_ALL_OPTIONS)), )
-    JTREG_AUTO_PROBLEM_LISTS += ProblemList-coh.txt
-  endif
-
-
   ifneq ($$(JTREG_EXTRA_PROBLEM_LISTS), )
     # Accept both absolute paths as well as relative to the current test root.
     $1_JTREG_BASIC_OPTIONS += $$(addprefix $$(JTREG_PROBLEM_LIST_PREFIX), $$(wildcard \
@@ -1020,6 +1032,9 @@ define SetupRunJtregTestBody
         VM_OPTIONS := $$(JTREG_ALL_OPTIONS) ))
     $$(call LogWarn, AOT_JDK_CACHE=$$($1_AOT_JDK_CACHE))
     $1_JTREG_BASIC_OPTIONS += -vmoption:-XX:AOTCache="$$($1_AOT_JDK_CACHE)"
+    $1_JTREG_BASIC_OPTIONS += $$(addprefix $$(JTREG_PROBLEM_LIST_PREFIX), $$(wildcard \
+        $$(addprefix $$($1_TEST_ROOT)/, ProblemList-AotJdk.txt) \
+    ))
   endif
 
 

make/RunTestsPrebuiltSpec.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2017, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2017, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -53,6 +53,9 @@ $(eval $(call VerifyVariable,TEST_IMAGE_DIR))
 $(eval $(call VerifyVariable,MAKE))
 $(eval $(call VerifyVariable,BASH))
 
+include $(TOPDIR)/make/conf/version-numbers.conf
+VERSION_FEATURE := $(DEFAULT_VERSION_FEATURE)
+
 ################################################################################
 # The "human readable" name of this configuration
 CONF_NAME := run-test-prebuilt
@@ -64,7 +67,7 @@ TEST_JOBS ?= 0
 # Use hard-coded values for java flags (one size, fits all!)
 JAVA_FLAGS := -Duser.language=en -Duser.country=US
 JAVA_FLAGS_BIG := -Xms64M -Xmx2048M
-JAVA_FLAGS_SMALL := -XX:+UseSerialGC -Xms32M -Xmx512M -XX:TieredStopAtLevel=1
+JAVA_FLAGS_SMALL := -Xms32M -Xmx512M -XX:TieredStopAtLevel=1
 BUILDJDK_JAVA_FLAGS_SMALL := -Xms32M -Xmx512M -XX:TieredStopAtLevel=1
 BUILD_JAVA_FLAGS := $(JAVA_FLAGS_BIG)
 

make/StaticLibsImage.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2019, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2019, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -39,8 +39,6 @@ ALL_MODULES = $(call FindAllModules)
 
 ifneq ($(filter static-libs-image, $(MAKECMDGOALS)), )
   IMAGE_DEST_DIR = $(STATIC_LIBS_IMAGE_DIR)/lib
-else ifneq ($(filter static-libs-graal-image, $(MAKECMDGOALS)), )
-  IMAGE_DEST_DIR = $(STATIC_LIBS_GRAAL_IMAGE_DIR)/lib
 endif
 
 # Copy JDK static libs to the image.
@@ -70,7 +68,6 @@ ifneq ($(filter static-libs-image, $(MAKECMDGOALS)), )
 endif
 
 static-libs-image: $(HOTSPOT_VARIANT_STATIC_LIBS_TARGETS) $(STATIC_LIBS_TARGETS)
-static-libs-graal-image: $(STATIC_LIBS_TARGETS)
 
 ################################################################################
 

make/ToolsJdk.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -81,6 +81,9 @@ TOOL_GENERATEEXTRAPROPERTIES = $(JAVA_SMALL) -cp $(BUILDTOOLS_OUTPUTDIR)/jdk_too
 TOOL_GENERATECASEFOLDING = $(JAVA_SMALL) -cp $(BUILDTOOLS_OUTPUTDIR)/jdk_tools_classes \
     build.tools.generatecharacter.GenerateCaseFolding
 
+TOOL_GENERATESPECIALCASING = $(JAVA_SMALL) -cp $(BUILDTOOLS_OUTPUTDIR)/jdk_tools_classes \
+    build.tools.generatespecialcasing.GenerateSpecialCasing
+
 TOOL_MAKEZIPREPRODUCIBLE = $(JAVA_SMALL) -cp $(BUILDTOOLS_OUTPUTDIR)/jdk_tools_classes \
     build.tools.makezipreproducible.MakeZipReproducible
 

make/UpdateSleefSource.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2024, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2024, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -48,7 +48,7 @@ ifneq ($(OPENJDK_BUILD_OS), linux)
 endif
 
 SLEEF_SUPPORT_DIR := $(MAKESUPPORT_OUTPUTDIR)/sleef
-SLEEF_SOURCE_BASE_DIR := $(TOPDIR)/src/jdk.incubator.vector/linux/native/libsleef
+SLEEF_SOURCE_BASE_DIR := $(TOPDIR)/src/jdk.incubator.vector/unix/native/libsleef
 SLEEF_SOURCE_DIR := $(SLEEF_SOURCE_BASE_DIR)/upstream
 SLEEF_TARGET_DIR := $(SLEEF_SOURCE_BASE_DIR)/generated
 SLEEF_NATIVE_BUILD_DIR := $(SLEEF_SUPPORT_DIR)/native
@@ -82,7 +82,12 @@ $(eval $(call SetupExecute, sleef_native_config, \
     INFO := Configuring native sleef build, \
     OUTPUT_DIR := $(SLEEF_NATIVE_BUILD_DIR), \
     WORKING_DIR := $(SLEEF_SOURCE_DIR), \
-    COMMAND := $(CMAKE) -S . -B $(SLEEF_NATIVE_BUILD_DIR), \
+    COMMAND := $(CMAKE) -S . -B $(SLEEF_NATIVE_BUILD_DIR) \
+       -DCMAKE_INSTALL_PREFIX=$(SLEEF_NATIVE_BUILD_DIR) \
+       -DSLEEF_BUILD_TESTS=OFF \
+       -DSLEEF_DISABLE_SSL=ON \
+       -DSLEEF_ENABLE_TLFLOAT=OFF \
+       -DSLEEF_ENABLE_TESTER4=OFF, \
 ))
 
 TARGETS := $(sleef_native_config)
@@ -106,6 +111,11 @@ $(eval $(call SetupExecute, sleef_cross_config, \
         -DCMAKE_C_COMPILER=$(CC) \
         -DCMAKE_TOOLCHAIN_FILE=$(SLEEF_CMAKE_FILE) \
         -DNATIVE_BUILD_DIR=$(SLEEF_NATIVE_BUILD_DIR) \
+        -DCMAKE_INSTALL_PREFIX=$(SLEEF_CROSS_BUILD_DIR) \
+        -DSLEEF_BUILD_TESTS=OFF \
+        -DSLEEF_DISABLE_SSL=ON \
+        -DSLEEF_ENABLE_TLFLOAT=OFF \
+        -DSLEEF_ENABLE_TESTER4=OFF \
         -DSLEEF_BUILD_INLINE_HEADERS=TRUE \
         $(EXTRA_CROSS_OPTIONS), \
 ))
@@ -139,7 +149,7 @@ $(eval $(call SetupCopyFiles, copy_generated_sleef_source, \
     DEST := $(SLEEF_TARGET_DIR), \
 ))
 
-TARGETS := $(copy_generated_sleef_source)
+TARGETS := $(copy_static_sleef_source) $(copy_generated_sleef_source)
 
 ################################################################################
 

make/ZipSource.gmk

@@ -35,12 +35,35 @@ $(if $(filter $(TOPDIR)/%, $(SUPPORT_OUTPUTDIR)), $(eval SRC_ZIP_BASE := $(TOPDI
 
 ################################################################################
 # Create the directory structure for src.zip using symlinks.
-# <module>/<package>/<file>.java
+#   <module>/<package>/<file>.java
+# or:
+#   <module>/META-INF/preview/<package>/<file>.java
+# for preview enabled sources.
+#
+# Generate the src dirs in the first make invocation and then call this makefile
+# again to create src.zip.
 
 ALL_MODULES := $(FindAllModules)
 
-# Generate the src dirs in the first make invocation and then call this makefile
-# again to create src.zip.
+# Module source directories ($d) are things like (but not limited to):
+# - $TOPDIR/src/<module>/share/classes
+# - $SUPPORT_OUTPUTDIR/gensrc/<module>
+#
+# A symbolic link is created for each directory. For example:
+# - $TOPDIR/src/<module>/share/classes
+# is linked from:
+# - $SRC_ZIP_WORK_DIR/src/<module>/share/classes/<module>
+#
+# Each link has the form:
+# - $SRC_ZIP_WORK_DIR/<link-dir>/<module>
+# and always has the name of its module (even if the module already appears in <link-dir>.
+#
+# Then the contents of all link parent directories are given as ZIP includes:
+# - $SRC_ZIP_WORK_DIR/<link-dir>
+# results in ZIP file entries starting:
+# - <module>/...
+# where multiple source links/directories can contribute to the same module's sources.
+#
 $(foreach m, $(ALL_MODULES), \
   $(foreach d, $(call FindModuleSrcDirs, $m), \
     $(eval $d_TARGET := $(SRC_ZIP_WORK_DIR)/$(patsubst $(TOPDIR)/%,%,$(patsubst $(SUPPORT_OUTPUTDIR)/%,%,$d))/$m) \
@@ -54,6 +77,36 @@ $(foreach m, $(ALL_MODULES), \
   ) \
 )
 
+# Preview source directories are currently limited to:
+# - $SUPPORT_OUTPUTDIR/gensrc-valueclasses/<module>
+# If this is changed, the 'patsubst' rewriting will need updating.
+#
+# The difficulty with this case is that we need to have a directory of the form:
+# - $SRC_ZIP_WORK_DIR/<link-dir>/<module>
+# containing (either directly or via symbolic linking) a `META-INF/preview`
+# subdirectory which then contains the sources.
+#
+# The easiest way to achieve this is to symbolically link:
+# - $SRC_ZIP_WORK_DIR/<link-dir>/<module>/META-INF/preview
+# and then use the parent directory:
+# - $SRC_ZIP_WORK_DIR/<link-dir>/<module>
+# as the actual target for the ZIP file generation. However, this requires
+# an extra rule to associate the symbolic link and the parent directory.
+#
+$(foreach m, $(ALL_MODULES), \
+  $(foreach d, $(call FindModulePreviewSrcDirs, $m), \
+    $(eval $d_TARGET := $(SRC_ZIP_WORK_DIR)/$(patsubst $(SUPPORT_OUTPUTDIR)/%,%,$d)/$m) \
+    $(if $(SRC_GENERATED), , \
+      $(eval $$($d_TARGET)/META-INF/preview: $d ; \
+          $$(if $(filter $(SRC_ZIP_BASE)/%, $d), $$(link-file-relative), $$(link-file-absolute)) \
+      ) \
+      $(eval $$($d_TARGET): $$($d_TARGET)/META-INF/preview) \
+    ) \
+    $(eval SRC_ZIP_SRCS += $$($d_TARGET)) \
+    $(eval SRC_ZIP_SRCS_$m += $$($d_TARGET)) \
+  ) \
+)
+
 TARGETS += $(SRC_ZIP_SRCS)
 
 ################################################################################

make/autoconf/basic.m4

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -327,14 +327,6 @@ AC_DEFUN_ONCE([BASIC_SETUP_DEVKIT],
     elif test -d "$DEVKIT_ROOT/$host/sys-root"; then
       SYSROOT="$DEVKIT_ROOT/$host/sys-root"
     fi
-
-    if test "x$DEVKIT_ROOT" != x; then
-      DEVKIT_LIB_DIR="$DEVKIT_ROOT/lib"
-      if test "x$OPENJDK_TARGET_CPU_BITS" = x64; then
-        DEVKIT_LIB_DIR="$DEVKIT_ROOT/lib64"
-      fi
-      AC_SUBST(DEVKIT_LIB_DIR)
-    fi
   fi
 
   # You can force the sysroot if the sysroot encoded into the compiler tools

make/autoconf/basic_tools.m4

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -148,7 +148,7 @@ AC_DEFUN([BASIC_CHECK_MAKE_VERSION],
           if test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.cygwin"; then
             MAKE_EXPECTED_ENV='cygwin'
           elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.msys2"; then
-            MAKE_EXPECTED_ENV='msys'
+            MAKE_EXPECTED_ENV='cygwin|msys'
           elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl1" || test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl2"; then
             if test "x$OPENJDK_BUILD_CPU" = "xaarch64"; then
               MAKE_EXPECTED_ENV='aarch64-.*-linux-gnu'
@@ -159,7 +159,7 @@ AC_DEFUN([BASIC_CHECK_MAKE_VERSION],
             AC_MSG_ERROR([Unknown Windows environment])
           fi
           MAKE_BUILT_FOR=`$MAKE_CANDIDATE --version | $GREP -i 'built for'`
-          IS_MAKE_CORRECT_ENV=`$ECHO $MAKE_BUILT_FOR | $GREP $MAKE_EXPECTED_ENV`
+          IS_MAKE_CORRECT_ENV=`$ECHO $MAKE_BUILT_FOR | $GREP -E $MAKE_EXPECTED_ENV`
         else
           # Not relevant for non-Windows
           IS_MAKE_CORRECT_ENV=true
@@ -369,6 +369,10 @@ AC_DEFUN_ONCE([BASIC_SETUP_COMPLEX_TOOLS],
     IS_GNU_DATE=yes
   else
     AC_MSG_RESULT([no])
+    # Likely at the AIX provided version of the date utility here, which is not compatible
+    if test "x$OPENJDK_TARGET_OS" = "xaix"; then
+      AC_MSG_ERROR([gnu date from AIX toolbox is required])
+    fi
     IS_GNU_DATE=no
   fi
   AC_SUBST(IS_GNU_DATE)

make/autoconf/boot-jdk.m4

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -481,8 +481,6 @@ AC_DEFUN_ONCE([BOOTJDK_SETUP_BOOT_JDK_ARGUMENTS],
 
   AC_MSG_CHECKING([flags for boot jdk java command for small workloads])
 
-  # Use serial gc for small short lived tools if possible
-  UTIL_ADD_JVM_ARG_IF_OK([-XX:+UseSerialGC],boot_jdk_jvmargs_small,[$JAVA])
   UTIL_ADD_JVM_ARG_IF_OK([-Xms32M],boot_jdk_jvmargs_small,[$JAVA])
   UTIL_ADD_JVM_ARG_IF_OK([-Xmx512M],boot_jdk_jvmargs_small,[$JAVA])
   UTIL_ADD_JVM_ARG_IF_OK([-XX:TieredStopAtLevel=1],boot_jdk_jvmargs_small,[$JAVA])
@@ -492,8 +490,6 @@ AC_DEFUN_ONCE([BOOTJDK_SETUP_BOOT_JDK_ARGUMENTS],
   JAVA_FLAGS_SMALL=$boot_jdk_jvmargs_small
   AC_SUBST(JAVA_FLAGS_SMALL)
 
-  # Don't presuppose SerialGC is present in the buildjdk. Also, we cannot test
-  # the buildjdk, but on the other hand we know what it will support.
   BUILD_JAVA_FLAGS_SMALL="-Xms32M -Xmx512M -XX:TieredStopAtLevel=1"
   AC_SUBST(BUILD_JAVA_FLAGS_SMALL)
 

make/autoconf/build-performance.m4

@@ -252,6 +252,109 @@ AC_DEFUN([BPERF_SETUP_CCACHE_USAGE],
   fi
 ])
 
+AC_DEFUN([BPERF_SETUP_SCCACHE],
+[
+  # Check if sccache is available
+  SCCACHE_AVAILABLE=true
+
+  UTIL_LOOKUP_TOOLCHAIN_PROGS(SCCACHE, sccache)
+
+  AC_MSG_CHECKING([if sccache is available])
+  if test "x$TOOLCHAIN_TYPE" != "xgcc" && test "x$TOOLCHAIN_TYPE" != "xclang" && \
+      test "x$TOOLCHAIN_TYPE" != "xmicrosoft"; then
+    AC_MSG_RESULT([no, not supported for toolchain type $TOOLCHAIN_TYPE])
+    SCCACHE_AVAILABLE=false
+  elif test "x$SCCACHE" = "x"; then
+    AC_MSG_RESULT([no, sccache binary missing or not executable])
+    SCCACHE_AVAILABLE=false
+  else
+    AC_MSG_RESULT([yes])
+  fi
+
+  SCCACHE_STATUS=""
+  UTIL_ARG_ENABLE(NAME: sccache, DEFAULT: false, AVAILABLE: $SCCACHE_AVAILABLE,
+      DESC: [enable using sccache to speed up recompilations],
+      CHECKING_MSG: [if sccache is enabled],
+      IF_ENABLED: [
+        if test "x$CCACHE" != x; then
+          AC_MSG_ERROR([Cannot enable both ccache and sccache])
+        fi
+        # Versions of sccache before 0.10.0 can restore stale or incorrect
+        # dependency files for cached C/C++ compilations, breaking our build.
+        SCCACHE_VERSION=[`$SCCACHE --version | head -n1 | $CUT -d " " -f 2 | $TR -d '\r'`]
+        if test "x$SCCACHE_VERSION" = x; then
+          AC_MSG_ERROR([Could not determine sccache version])
+        fi
+        HAS_BAD_SCCACHE=[`$ECHO $SCCACHE_VERSION | \
+            $GREP -e '^0\.[0-9]\.' -e '^0\.[0-9]$'`]
+        if test "x$HAS_BAD_SCCACHE" != "x"; then
+          AC_MSG_ERROR([[sccache 0.10.0 or later is required, found $SCCACHE_VERSION]])
+        fi
+        SCCACHE_STATUS="Active ($SCCACHE_VERSION)"
+      ],
+      IF_DISABLED: [
+        SCCACHE=""
+      ])
+  AC_SUBST(SCCACHE)
+
+  AC_ARG_WITH([sccache-dir],
+      [AS_HELP_STRING([--with-sccache-dir],
+      [where to store sccache files @<:@~/.cache/sccache@:>@])])
+
+  if test "x$with_sccache_dir" != x; then
+    SCCACHE_DIR="$with_sccache_dir"
+    SCCACHE_DIR_FOR_SCCACHE="$SCCACHE_DIR"
+
+    # Ideally, we'd use `UTIL_FIXUP_PATH()`, but it expects the supplied path to
+    # already exist, which might not be true for the sccache directory during
+    # the configure step.  As a workaround, we manually invoke fixpath.sh.
+    if test "x$OPENJDK_BUILD_OS" = "xwindows"; then
+      SCCACHE_DIR_FOR_SCCACHE=`$FIXPATH_BASE -m print "$SCCACHE_DIR_FOR_SCCACHE"`
+    fi
+
+    SET_SCCACHE_DIR="SCCACHE_DIR=$SCCACHE_DIR_FOR_SCCACHE"
+    if test "x$SCCACHE" = x; then
+      AC_MSG_WARN([--with-sccache-dir has no meaning when sccache is not enabled])
+    fi
+  fi
+
+  if test "x$SCCACHE" != x; then
+    BPERF_SETUP_SCCACHE_USAGE
+  fi
+])
+
+AC_DEFUN([BPERF_SETUP_SCCACHE_USAGE],
+[
+  if test "x$SCCACHE" != x; then
+    if test "x$USE_PRECOMPILED_HEADER" = "xtrue"; then
+      if test "x$PRECOMPILED_HEADERS_EXPLICITLY_SET" = "xtrue"; then
+        AC_MSG_ERROR([Cannot use sccache with precompiled headers. Use --disable-precompiled-headers.])
+      else
+        AC_MSG_NOTICE([Disabling precompiled headers because sccache is enabled])
+        USE_PRECOMPILED_HEADER=false
+      fi
+    fi
+
+    # On Windows, the sccache binary must be launched through fixpath and the
+    # compiler argument passed to sccache must be the actual compiler
+    # (gcc/clang/cl) and not another fixpath invocation, otherwise sccache will
+    # try to execute fixpath as the compiler.
+    [ if [[ "$OPENJDK_BUILD_OS" = "windows" && "$SCCACHE" =~ ^"$FIXPATH " ]]; then ]
+      [ if [[ "$CC" =~ ^"$FIXPATH " ]]; then ]
+        CC="${CC#"$FIXPATH "}"
+      [ fi ]
+      [ if [[ "$CXX" =~ ^"$FIXPATH " ]]; then ]
+        CXX="${CXX#"$FIXPATH "}"
+      [ fi ]
+    [ fi ]
+
+    if test "x$SET_SCCACHE_DIR" != x; then
+      SCCACHE="$SET_SCCACHE_DIR $SCCACHE"
+      mkdir -p "$SCCACHE_DIR" > /dev/null 2>&1
+    fi
+  fi
+])
+
 ################################################################################
 #
 # Runs icecc-create-env once and prints the error if it fails
@@ -372,7 +475,13 @@ AC_DEFUN_ONCE([BPERF_SETUP_PRECOMPILED_HEADERS],
 
   UTIL_ARG_ENABLE(NAME: precompiled-headers, DEFAULT: auto,
       RESULT: USE_PRECOMPILED_HEADER, AVAILABLE: $PRECOMPILED_HEADERS_AVAILABLE,
-      DESC: [enable using precompiled headers when compiling C++])
+      DESC: [enable using precompiled headers when compiling C++],
+      IF_GIVEN: [
+        PRECOMPILED_HEADERS_EXPLICITLY_SET=true
+      ],
+      IF_NOT_GIVEN: [
+        PRECOMPILED_HEADERS_EXPLICITLY_SET=false
+      ])
   AC_SUBST(USE_PRECOMPILED_HEADER)
 ])
 

make/autoconf/buildjdk-spec.gmk.template

@@ -108,3 +108,4 @@ override EXTRA_LDFLAGS :=
 # hsdis is not needed
 HSDIS_BACKEND := none
 ENABLE_HSDIS_BUNDLING := false
+DEFAULT_PRINT_ASSEMBLY_OPTIONS :=

make/autoconf/configure.ac

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -260,7 +260,9 @@ LIB_TESTS_ENABLE_DISABLE_JTREG_TEST_THREAD_FACTORY
 JDKOPT_ENABLE_DISABLE_GENERATE_CLASSLIST
 JDKOPT_EXCLUDE_TRANSLATIONS
 JDKOPT_ENABLE_DISABLE_CDS_ARCHIVE
-JDKOPT_ENABLE_DISABLE_CDS_ARCHIVE_COH
+JDKOPT_ENABLE_DISABLE_CDS_ARCHIVE_NOCOH
+JDKOPT_ENABLE_DISABLE_CDS_ARCHIVE_NOCOOPS
+JDKOPT_ENABLE_DISABLE_CDS_ARCHIVE_PREVIEW
 JDKOPT_ENABLE_DISABLE_COMPATIBLE_CDS_ALIGNMENT
 JDKOPT_SETUP_MACOSX_SIGNING
 JDKOPT_SETUP_SIGNING_HOOK
@@ -291,6 +293,9 @@ BPERF_SETUP_PRECOMPILED_HEADERS
 # Setup use of ccache, if available
 BPERF_SETUP_CCACHE
 
+# Setup use of sccache, if available
+BPERF_SETUP_SCCACHE
+
 ################################################################################
 #
 # And now the finish...

make/autoconf/flags-cflags.m4

@@ -214,6 +214,7 @@ AC_DEFUN([FLAGS_SETUP_WARNINGS],
       WARNINGS_ENABLE_ADDITIONAL_CXX=""
       WARNINGS_ENABLE_ADDITIONAL_JVM=""
       DISABLED_WARNINGS="4800 5105"
+      CFLAGS_CONVERSION_WARNINGS=
       ;;
 
     gcc)
@@ -239,6 +240,7 @@ AC_DEFUN([FLAGS_SETUP_WARNINGS],
       if test "x$OPENJDK_TARGET_CPU_ARCH" = "xppc"; then
         DISABLED_WARNINGS="$DISABLED_WARNINGS psabi"
       fi
+      CFLAGS_CONVERSION_WARNINGS="-Wconversion -Wno-float-conversion"
       ;;
 
     clang)
@@ -258,6 +260,7 @@ AC_DEFUN([FLAGS_SETUP_WARNINGS],
       # These warnings will never be turned on, since they generate too many
       # false positives.
       DISABLED_WARNINGS="unknown-warning-option unused-parameter"
+      CFLAGS_CONVERSION_WARNINGS="-Wimplicit-int-conversion"
       ;;
   esac
   WARNINGS_ENABLE_ALL="$WARNINGS_ENABLE_ALL_NORMAL $WARNINGS_ENABLE_ADDITIONAL"
@@ -270,6 +273,7 @@ AC_DEFUN([FLAGS_SETUP_WARNINGS],
   AC_SUBST(DISABLED_WARNINGS)
   AC_SUBST(DISABLED_WARNINGS_C)
   AC_SUBST(DISABLED_WARNINGS_CXX)
+  AC_SUBST(CFLAGS_CONVERSION_WARNINGS)
 ])
 
 AC_DEFUN([FLAGS_SETUP_QUALITY_CHECKS],
@@ -540,12 +544,9 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_HELPER],
     TOOLCHAIN_CFLAGS_JVM="$TOOLCHAIN_CFLAGS_JVM -fstack-protector"
     TOOLCHAIN_CFLAGS_JDK="-fvisibility=hidden -pipe -fstack-protector"
     # reduce lib size on linux in link step, this needs also special compile flags
-    # do this on s390x also for libjvm (where serviceability agent is not supported)
     if test "x$ENABLE_LINKTIME_GC" = xtrue; then
       TOOLCHAIN_CFLAGS_JDK="$TOOLCHAIN_CFLAGS_JDK -ffunction-sections -fdata-sections"
-      if test "x$OPENJDK_TARGET_CPU" = xs390x && test "x$DEBUG_LEVEL" == xrelease; then
-        TOOLCHAIN_CFLAGS_JVM="$TOOLCHAIN_CFLAGS_JVM -ffunction-sections -fdata-sections"
-      fi
+      TOOLCHAIN_CFLAGS_JVM="$TOOLCHAIN_CFLAGS_JVM -ffunction-sections -fdata-sections"
     fi
     # technically NOT for CXX (but since this gives *worse* performance, use
     # no-strict-aliasing everywhere!)
@@ -574,6 +575,11 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_HELPER],
       TOOLCHAIN_CFLAGS_JDK_CONLY="-fno-strict-aliasing" # technically NOT for CXX
     fi
 
+    if test "x$ENABLE_LINKTIME_GC" = xtrue; then
+      TOOLCHAIN_CFLAGS_JDK="$TOOLCHAIN_CFLAGS_JDK -ffunction-sections -fdata-sections"
+      TOOLCHAIN_CFLAGS_JVM="$TOOLCHAIN_CFLAGS_JVM -ffunction-sections -fdata-sections"
+    fi
+
     if test "x$OPENJDK_TARGET_OS" = xaix; then
       TOOLCHAIN_CFLAGS_JVM="$TOOLCHAIN_CFLAGS_JVM -ffunction-sections -ftls-model -fno-math-errno"
       TOOLCHAIN_CFLAGS_JDK="-ffunction-sections -fsigned-char"
@@ -939,11 +945,21 @@ AC_DEFUN_ONCE([FLAGS_SETUP_BRANCH_PROTECTION],
 [
   # Is branch protection available?
   BRANCH_PROTECTION_AVAILABLE=false
-  BRANCH_PROTECTION_FLAG="-mbranch-protection=standard"
+  BRANCH_PROTECTION_CFLAG=""
+  BRANCH_PROTECTION_ASFLAG=""
 
   if test "x$OPENJDK_TARGET_CPU" = xaarch64; then
     if test "x$TOOLCHAIN_TYPE" = xgcc || test "x$TOOLCHAIN_TYPE" = xclang; then
-      FLAGS_COMPILER_CHECK_ARGUMENTS(ARGUMENT: [$BRANCH_PROTECTION_FLAG],
+      BRANCH_PROTECTION_CFLAG="-mbranch-protection=standard"
+      # The GCC/Clang assembler accepts the same flag as the compiler.
+      BRANCH_PROTECTION_ASFLAG="$BRANCH_PROTECTION_CFLAG"
+      FLAGS_COMPILER_CHECK_ARGUMENTS(ARGUMENT: [$BRANCH_PROTECTION_CFLAG],
+          IF_TRUE: [BRANCH_PROTECTION_AVAILABLE=true])
+    elif test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
+      BRANCH_PROTECTION_CFLAG="/guard:signret"
+      # MSVC's assembler does not support branch protection flags, so
+      # BRANCH_PROTECTION_ASFLAG is intentionally left empty.
+      FLAGS_COMPILER_CHECK_ARGUMENTS(ARGUMENT: [$BRANCH_PROTECTION_CFLAG],
           IF_TRUE: [BRANCH_PROTECTION_AVAILABLE=true])
     fi
   fi
@@ -951,5 +967,5 @@ AC_DEFUN_ONCE([FLAGS_SETUP_BRANCH_PROTECTION],
   UTIL_ARG_ENABLE(NAME: branch-protection, DEFAULT: false,
       RESULT: BRANCH_PROTECTION_ENABLED, AVAILABLE: $BRANCH_PROTECTION_AVAILABLE,
       DESC: [enable branch protection when compiling C/C++],
-      IF_ENABLED: [BRANCH_PROTECTION_CFLAGS=$BRANCH_PROTECTION_FLAG])
+      IF_ENABLED: [BRANCH_PROTECTION_CFLAGS=$BRANCH_PROTECTION_CFLAG])
 ])

make/autoconf/flags-ldflags.m4

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -53,16 +53,15 @@ AC_DEFUN([FLAGS_SETUP_LDFLAGS_HELPER],
     # add --icf=all (Identical Code Folding — merges identical functions)
     BASIC_LDFLAGS="-Wl,-z,defs -Wl,-z,relro -Wl,-z,now -Wl,--no-as-needed -Wl,--exclude-libs,ALL"
 
+    BASIC_LDFLAGS_JVM_ONLY=""
     # Linux : remove unused code+data in link step
     if test "x$ENABLE_LINKTIME_GC" = xtrue; then
-      if test "x$OPENJDK_TARGET_CPU" = xs390x; then
-        BASIC_LDFLAGS="$BASIC_LDFLAGS -Wl,--gc-sections"
-      else
-        BASIC_LDFLAGS_JDK_ONLY="$BASIC_LDFLAGS_JDK_ONLY -Wl,--gc-sections"
-      fi
+      # keep vtables : -Wl,--undefined-glob=_ZTV* (but this seems not to work with gold ld)
+      # so keep at least the Metadata vtable that is used in the serviceability agent
+      BASIC_LDFLAGS_JVM_ONLY="$BASIC_LDFLAGS_JVM_ONLY -Wl,--gc-sections -Wl,--undefined=_ZTV8Metadata"
+      BASIC_LDFLAGS_JDK_ONLY="$BASIC_LDFLAGS_JDK_ONLY -Wl,--gc-sections"
     fi
 
-    BASIC_LDFLAGS_JVM_ONLY=""
     LDFLAGS_LTO="-flto=auto -fuse-linker-plugin -fno-strict-aliasing $DEBUG_PREFIX_CFLAGS"
 
     LDFLAGS_CXX_PARTIAL_LINKING="$MACHINE_FLAG -r"
@@ -80,6 +79,11 @@ AC_DEFUN([FLAGS_SETUP_LDFLAGS_HELPER],
       if test "x$CXX_IS_USER_SUPPLIED" = xfalse && test "x$CC_IS_USER_SUPPLIED" = xfalse; then
         UTIL_REQUIRE_TOOLCHAIN_PROGS(LLD, lld)
       fi
+
+      if test "x$ENABLE_LINKTIME_GC" = xtrue; then
+        BASIC_LDFLAGS_JVM_ONLY="$BASIC_LDFLAGS_JVM_ONLY -Wl,--gc-sections -Wl,--undefined=_ZTV8Metadata"
+        BASIC_LDFLAGS_JDK_ONLY="$BASIC_LDFLAGS_JDK_ONLY -Wl,--gc-sections"
+      fi
     fi
     if test "x$OPENJDK_TARGET_OS" = xaix; then
       BASIC_LDFLAGS="-Wl,-b64 -Wl,-brtl -Wl,-bnorwexec -Wl,-blibpath:/usr/lib:lib -Wl,-bnoexpall \
@@ -90,7 +94,7 @@ AC_DEFUN([FLAGS_SETUP_LDFLAGS_HELPER],
   elif test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
     BASIC_LDFLAGS="-opt:ref"
     BASIC_LDFLAGS_JDK_ONLY="-incremental:no"
-    BASIC_LDFLAGS_JVM_ONLY="-opt:icf,8 -subsystem:windows"
+    BASIC_LDFLAGS_JVM_ONLY="-opt:noicf -subsystem:windows"
     LDFLAGS_LTO="-LTCG:INCREMENTAL"
   fi
 

make/autoconf/flags-other.m4

@@ -211,7 +211,7 @@ AC_DEFUN([FLAGS_SETUP_ASFLAGS_CPU_DEP],
   fi
 
   if test "x$BRANCH_PROTECTION_ENABLED" = "xtrue"; then
-    $2JVM_ASFLAGS="${$2JVM_ASFLAGS} $BRANCH_PROTECTION_FLAG"
+    $2JVM_ASFLAGS="${$2JVM_ASFLAGS} $BRANCH_PROTECTION_ASFLAG"
   fi
 
   AC_SUBST($2JVM_ASFLAGS)

make/autoconf/help.m4

@@ -335,6 +335,9 @@ AC_DEFUN_ONCE([HELP_PRINT_SUMMARY_AND_WARNINGS],
   if test "x$CCACHE_STATUS" != "x"; then
     $ECHO "* ccache status:  $CCACHE_STATUS"
   fi
+  if test "x$SCCACHE_STATUS" != "x"; then
+    $ECHO "* sccache status: $SCCACHE_STATUS"
+  fi
   $ECHO ""
 
   if test "x$BUILDING_MULTIPLE_JVM_VARIANTS" = "xtrue"; then

make/autoconf/jdk-options.m4

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -95,6 +95,13 @@ AC_DEFUN_ONCE([JDKOPT_SETUP_OPEN_OR_CUSTOM],
 
 AC_DEFUN_ONCE([JDKOPT_SETUP_JDK_OPTIONS],
 [
+  # Should we build a JDK with/without sound ?
+  UTIL_ARG_ENABLE(NAME: jsound, DEFAULT: true,
+      RESULT: ENABLE_JSOUND,
+      DESC: [build with sound support],
+      CHECKING_MSG: [if we should build with sound support])
+  AC_SUBST(ENABLE_JSOUND)
+
   # Should we build a JDK without a graphical UI?
   UTIL_ARG_ENABLE(NAME: headless-only, DEFAULT: false,
       RESULT: ENABLE_HEADLESS_ONLY,
@@ -102,9 +109,20 @@ AC_DEFUN_ONCE([JDKOPT_SETUP_JDK_OPTIONS],
       CHECKING_MSG: [if we should build headless-only (no GUI)])
   AC_SUBST(ENABLE_HEADLESS_ONLY)
 
+  # Avoid headless-only on macOS and Windows, it is not supported there
+  if test "x$ENABLE_HEADLESS_ONLY" = xtrue; then
+    if test "x$OPENJDK_TARGET_OS" = xwindows || test "x$OPENJDK_TARGET_OS" = xmacosx; then
+      AC_MSG_ERROR([headless-only is not supported on macOS and Windows])
+    fi
+  fi
+
   # should we linktime gc unused code sections in the JDK build ?
-  if test "x$OPENJDK_TARGET_OS" = "xlinux" && test "x$OPENJDK_TARGET_CPU" = xs390x; then
-    LINKTIME_GC_DEFAULT=true
+  if test "x$OPENJDK_TARGET_OS" = "xlinux"; then
+    if test "x$OPENJDK_TARGET_CPU" = "xs390x" || test "x$OPENJDK_TARGET_CPU" = "xppc64le"; then
+      LINKTIME_GC_DEFAULT=true
+    else
+      LINKTIME_GC_DEFAULT=false
+    fi
   else
     LINKTIME_GC_DEFAULT=false
   fi
@@ -312,6 +330,14 @@ AC_DEFUN_ONCE([JDKOPT_SETUP_DEBUG_SYMBOLS],
   AC_SUBST(COPY_DEBUG_SYMBOLS)
   AC_SUBST(ZIP_EXTERNAL_DEBUG_SYMBOLS)
 
+  # Should we enable objcopy debuginfo compression ?
+  UTIL_ARG_ENABLE(NAME: objcopy-debuginfo-compression, DEFAULT: false,
+      RESULT: ENABLE_OBJCOPY_DEBUGINFO_COMPRESSION,
+      DESC: [Set to enable compression in the debuginfo files (Linux only)],
+      CHECKING_MSG: [if debuginfo compression with objcopy is done],
+      IF_ENABLED: [ OBJCOPY_COMPRESS_FLAGS="--compress-debug-sections=zlib-gnu" ])
+  AC_SUBST(OBJCOPY_COMPRESS_FLAGS)
+
   # Should we add external native debug symbols to the shipped bundles?
   AC_MSG_CHECKING([if we should add external native debug symbols to the shipped bundles])
   AC_ARG_WITH([external-symbols-in-bundles],
@@ -767,14 +793,13 @@ AC_DEFUN([JDKOPT_ENABLE_DISABLE_CDS_ARCHIVE],
 #
 # Enable or disable the default CDS archive generation for Compact Object Headers
 #
-AC_DEFUN([JDKOPT_ENABLE_DISABLE_CDS_ARCHIVE_COH],
+AC_DEFUN([JDKOPT_ENABLE_DISABLE_CDS_ARCHIVE_NOCOH],
 [
-  UTIL_ARG_ENABLE(NAME: cds-archive-coh, DEFAULT: auto, RESULT: BUILD_CDS_ARCHIVE_COH,
-      DESC: [enable generation of default CDS archives for compact object headers (requires --enable-cds-archive)],
-      DEFAULT_DESC: [auto],
-      CHECKING_MSG: [if default CDS archives for compact object headers should be generated],
+  UTIL_ARG_ENABLE(NAME: cds-archive-nocoh, DEFAULT: auto, RESULT: BUILD_CDS_ARCHIVE_NOCOH,
+      DESC: [enable generation of default CDS archives for no compact object headers (requires --enable-cds-archive)],
+      CHECKING_MSG: [if default CDS archives for no compact object headers should be generated],
       CHECK_AVAILABLE: [
-        AC_MSG_CHECKING([if CDS archive with compact object headers is available])
+        AC_MSG_CHECKING([if CDS archive with no compact object headers is available])
         if test "x$BUILD_CDS_ARCHIVE" = "xfalse"; then
           AC_MSG_RESULT([no (CDS default archive generation is disabled)])
           AVAILABLE=false
@@ -791,7 +816,23 @@ AC_DEFUN([JDKOPT_ENABLE_DISABLE_CDS_ARCHIVE_COH],
           AVAILABLE=true
         fi
       ])
-  AC_SUBST(BUILD_CDS_ARCHIVE_COH)
+  AC_SUBST(BUILD_CDS_ARCHIVE_NOCOH)
+])
+
+AC_DEFUN([JDKOPT_ENABLE_DISABLE_CDS_ARCHIVE_NOCOOPS],
+[
+  UTIL_ARG_ENABLE(NAME: cds-archive-nocoops, DEFAULT: true, RESULT: BUILD_CDS_ARCHIVE_NOCOOPS,
+      DESC: [enable generation of no compressed oops CDS archives (requires --enable-cds-archive)],
+      CHECKING_MSG: [if default CDS archives for no compressed oops should be generated])
+  AC_SUBST(BUILD_CDS_ARCHIVE_NOCOOPS)
+])
+
+AC_DEFUN([JDKOPT_ENABLE_DISABLE_CDS_ARCHIVE_PREVIEW],
+[
+  UTIL_ARG_ENABLE(NAME: cds-archive-preview, DEFAULT: true, RESULT: BUILD_CDS_ARCHIVE_PREVIEW,
+      DESC: [enable generation of preview CDS archives (requires --enable-cds-archive)],
+      CHECKING_MSG: [if default CDS archives for preview should be generated])
+  AC_SUBST(BUILD_CDS_ARCHIVE_PREVIEW)
 ])
 
 ################################################################################

make/autoconf/jvm-features.m4

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -45,7 +45,7 @@ m4_define(jvm_features_valid, m4_normalize( \
     ifdef([custom_jvm_features_valid], custom_jvm_features_valid) \
     \
     cds compiler1 compiler2 dtrace epsilongc g1gc jfr jni-check \
-    jvmci jvmti link-time-opt management minimal opt-size parallelgc \
+    jvmti link-time-opt management minimal opt-size parallelgc \
     serialgc services shenandoahgc vm-structs zero zgc \
 ))
 
@@ -62,7 +62,6 @@ m4_define(jvm_feature_desc_epsilongc, [include the epsilon (no-op) garbage colle
 m4_define(jvm_feature_desc_g1gc, [include the G1 garbage collector])
 m4_define(jvm_feature_desc_jfr, [enable JDK Flight Recorder (JFR)])
 m4_define(jvm_feature_desc_jni_check, [enable -Xcheck:jni support])
-m4_define(jvm_feature_desc_jvmci, [enable JVM Compiler Interface (JVMCI)])
 m4_define(jvm_feature_desc_jvmti, [enable Java Virtual Machine Tool Interface (JVM TI)])
 m4_define(jvm_feature_desc_link_time_opt, [enable link time optimization])
 m4_define(jvm_feature_desc_management, [enable java.lang.management API support])
@@ -269,26 +268,6 @@ AC_DEFUN_ONCE([JVM_FEATURES_CHECK_DTRACE],
   ])
 ])
 
-################################################################################
-# Check if the feature 'jvmci' is available on this platform.
-#
-AC_DEFUN_ONCE([JVM_FEATURES_CHECK_JVMCI],
-[
-  JVM_FEATURES_CHECK_AVAILABILITY(jvmci, [
-    AC_MSG_CHECKING([if platform is supported by JVMCI])
-    if test "x$OPENJDK_TARGET_CPU" = "xx86_64"; then
-      AC_MSG_RESULT([yes])
-    elif test "x$OPENJDK_TARGET_CPU" = "xaarch64"; then
-      AC_MSG_RESULT([yes])
-    elif test "x$OPENJDK_TARGET_CPU" = "xriscv64"; then
-      AC_MSG_RESULT([yes])
-    else
-      AC_MSG_RESULT([no, $OPENJDK_TARGET_CPU])
-      AVAILABLE=false
-    fi
-  ])
-])
-
 ################################################################################
 # Check if the feature 'shenandoahgc' is available on this platform.
 #
@@ -376,7 +355,6 @@ AC_DEFUN_ONCE([JVM_FEATURES_PREPARE_PLATFORM],
 
   JVM_FEATURES_CHECK_CDS
   JVM_FEATURES_CHECK_DTRACE
-  JVM_FEATURES_CHECK_JVMCI
   JVM_FEATURES_CHECK_SHENANDOAHGC
   JVM_FEATURES_CHECK_ZGC
 
@@ -401,17 +379,17 @@ AC_DEFUN([JVM_FEATURES_PREPARE_VARIANT],
     JVM_FEATURES_VARIANT_UNAVAILABLE="cds minimal zero"
   elif test "x$variant" = "xzero"; then
     JVM_FEATURES_VARIANT_UNAVAILABLE="compiler1 compiler2 \
-        jvmci minimal zgc"
+        minimal zgc"
   else
     JVM_FEATURES_VARIANT_UNAVAILABLE="minimal zero"
   fi
 
   # Check which features should be off by default for this JVM variant.
   if test "x$variant" = "xclient"; then
-    JVM_FEATURES_VARIANT_FILTER="compiler2 jvmci link-time-opt opt-size"
+    JVM_FEATURES_VARIANT_FILTER="compiler2 link-time-opt opt-size"
   elif test "x$variant" = "xminimal"; then
     JVM_FEATURES_VARIANT_FILTER="cds compiler2 dtrace epsilongc g1gc \
-        jfr jni-check jvmci jvmti management parallelgc services \
+        jfr jni-check jvmti management parallelgc services \
         shenandoahgc vm-structs zgc"
     if test "x$OPENJDK_TARGET_CPU" = xarm ; then
       JVM_FEATURES_VARIANT_FILTER="$JVM_FEATURES_VARIANT_FILTER opt-size"
@@ -421,7 +399,7 @@ AC_DEFUN([JVM_FEATURES_PREPARE_VARIANT],
           link-time-opt"
     fi
   elif test "x$variant" = "xcore"; then
-    JVM_FEATURES_VARIANT_FILTER="compiler1 compiler2 jvmci \
+    JVM_FEATURES_VARIANT_FILTER="compiler1 compiler2 \
         link-time-opt opt-size"
   elif test "x$variant" = "xzero"; then
     JVM_FEATURES_VARIANT_FILTER="jfr link-time-opt opt-size"
@@ -517,11 +495,6 @@ AC_DEFUN([JVM_FEATURES_VERIFY],
     AC_MSG_ERROR([Specified JVM feature 'jfr' requires feature 'services' for variant '$variant'])
   fi
 
-  if JVM_FEATURES_IS_ACTIVE(jvmci) && ! (JVM_FEATURES_IS_ACTIVE(compiler1) || \
-      JVM_FEATURES_IS_ACTIVE(compiler2)); then
-    AC_MSG_ERROR([Specified JVM feature 'jvmci' requires feature 'compiler2' or 'compiler1' for variant '$variant'])
-  fi
-
   if JVM_FEATURES_IS_ACTIVE(jvmti) && ! JVM_FEATURES_IS_ACTIVE(services); then
     AC_MSG_ERROR([Specified JVM feature 'jvmti' requires feature 'services' for variant '$variant'])
   fi
@@ -531,9 +504,6 @@ AC_DEFUN([JVM_FEATURES_VERIFY],
   if ! JVM_FEATURES_IS_ACTIVE(cds); then
     ENABLE_CDS="false"
   fi
-  if ! JVM_FEATURES_IS_ACTIVE(jvmci); then
-    INCLUDE_JVMCI="false"
-  fi
   if JVM_FEATURES_IS_ACTIVE(compiler2); then
     INCLUDE_COMPILER2="true"
   fi
@@ -559,7 +529,6 @@ AC_DEFUN_ONCE([JVM_FEATURES_SETUP],
   # and disable them in JVM_FEATURES_VERIFY if a variant is found that are
   # missing any of them.
   ENABLE_CDS="true"
-  INCLUDE_JVMCI="true"
   INCLUDE_COMPILER2="false"
 
   for variant in $JVM_VARIANTS; do
@@ -599,7 +568,6 @@ AC_DEFUN_ONCE([JVM_FEATURES_SETUP],
   AC_SUBST(JVM_FEATURES_zero)
   AC_SUBST(JVM_FEATURES_custom)
 
-  AC_SUBST(INCLUDE_JVMCI)
   AC_SUBST(INCLUDE_COMPILER2)
 
 ])

make/autoconf/lib-bundled.m4

@@ -267,8 +267,8 @@ AC_DEFUN_ONCE([LIB_SETUP_ZLIB],
   LIBZ_LIBS=""
   if test "x$USE_EXTERNAL_LIBZ" = "xfalse"; then
     LIBZ_CFLAGS="$LIBZ_CFLAGS -I$TOPDIR/src/java.base/share/native/libzip/zlib"
-    if test "x$OPENJDK_TARGET_OS" = xmacosx; then
-        LIBZ_CFLAGS="$LIBZ_CFLAGS -DHAVE_UNISTD_H"
+    if test "x$OPENJDK_TARGET_OS" = xmacosx -o "x$OPENJDK_TARGET_OS" = xaix -o "x$OPENJDK_TARGET_OS" = xlinux; then
+        LIBZ_CFLAGS="$LIBZ_CFLAGS -DHAVE_UNISTD_H=1 -DHAVE_STDARG_H=1"
     fi
   else
     LIBZ_LIBS="-lz"

make/autoconf/lib-hsdis.m4

@@ -417,4 +417,9 @@ AC_DEFUN_ONCE([LIB_SETUP_HSDIS],
     AC_MSG_RESULT([no])
   fi
   AC_SUBST(ENABLE_HSDIS_BUNDLING)
+
+  UTIL_ARG_WITH(NAME: print-assembly-options, TYPE: string,
+      DEFAULT: [], RESULT: DEFAULT_PRINT_ASSEMBLY_OPTIONS,
+      DESC: [default value for the PrintAssemblyOptions diagnostic flag, passed verbatim to the disassembler])
+  AC_SUBST(DEFAULT_PRINT_ASSEMBLY_OPTIONS)
 ])

make/autoconf/lib-tests.m4

@@ -28,7 +28,7 @@
 ################################################################################
 
 # Minimum supported versions
-JTREG_MINIMUM_VERSION=8.2.1
+JTREG_MINIMUM_VERSION=8.3
 GTEST_MINIMUM_VERSION=1.14.0
 
 ################################################################################

make/autoconf/libraries.m4

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -149,7 +149,7 @@ AC_DEFUN_ONCE([LIB_SETUP_LIBRARIES],
   if test "x$OPENJDK_TARGET_OS" = xwindows; then
     BASIC_JVM_LIBS="$BASIC_JVM_LIBS kernel32.lib user32.lib gdi32.lib winspool.lib \
         comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib powrprof.lib uuid.lib \
-        ws2_32.lib winmm.lib version.lib psapi.lib"
+        ws2_32.lib winmm.lib version.lib"
   fi
   LIB_SETUP_JVM_LIBS(BUILD)
   LIB_SETUP_JVM_LIBS(TARGET)

make/autoconf/platform.m4

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -174,18 +174,6 @@ AC_DEFUN([PLATFORM_EXTRACT_VARS_FROM_CPU],
       VAR_CPU_BITS=64
       VAR_CPU_ENDIAN=big
       ;;
-    sparc)
-      VAR_CPU=sparc
-      VAR_CPU_ARCH=sparc
-      VAR_CPU_BITS=32
-      VAR_CPU_ENDIAN=big
-      ;;
-    sparcv9|sparc64)
-      VAR_CPU=sparcv9
-      VAR_CPU_ARCH=sparc
-      VAR_CPU_BITS=64
-      VAR_CPU_ENDIAN=big
-      ;;
     *)
       AC_MSG_ERROR([unsupported cpu $1])
       ;;
@@ -311,6 +299,12 @@ AC_DEFUN([PLATFORM_EXTRACT_TARGET_AND_BUILD],
   else
     OPENJDK_BUILD_OS_ENV="$VAR_OS"
   fi
+  # Special handling for MSYS2 that reports a Cygwin triplet as the default host triplet.
+  case `uname` in
+    MSYS*)
+      OPENJDK_BUILD_OS_ENV=windows.msys2
+      ;;
+  esac
   OPENJDK_BUILD_CPU="$VAR_CPU"
   OPENJDK_BUILD_CPU_ARCH="$VAR_CPU_ARCH"
   OPENJDK_BUILD_CPU_BITS="$VAR_CPU_BITS"

make/autoconf/spec.gmk.template

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -329,6 +329,8 @@ HOTSPOT_OVERRIDE_LIBPATH := @HOTSPOT_OVERRIDE_LIBPATH@
 # Control use of precompiled header in hotspot libjvm build
 USE_PRECOMPILED_HEADER := @USE_PRECOMPILED_HEADER@
 
+ENABLE_JSOUND := @ENABLE_JSOUND@
+
 # Only build headless support or not
 ENABLE_HEADLESS_ONLY := @ENABLE_HEADLESS_ONLY@
 
@@ -369,7 +371,9 @@ ENABLE_GENERATE_CLASSLIST := @ENABLE_GENERATE_CLASSLIST@
 EXCLUDE_TRANSLATIONS := @EXCLUDE_TRANSLATIONS@
 
 BUILD_CDS_ARCHIVE := @BUILD_CDS_ARCHIVE@
-BUILD_CDS_ARCHIVE_COH := @BUILD_CDS_ARCHIVE_COH@
+BUILD_CDS_ARCHIVE_NOCOH := @BUILD_CDS_ARCHIVE_NOCOH@
+BUILD_CDS_ARCHIVE_NOCOOPS := @BUILD_CDS_ARCHIVE_NOCOOPS@
+BUILD_CDS_ARCHIVE_PREVIEW := @BUILD_CDS_ARCHIVE_PREVIEW@
 
 ENABLE_COMPATIBLE_CDS_ALIGNMENT := @ENABLE_COMPATIBLE_CDS_ALIGNMENT@
 
@@ -381,6 +385,7 @@ HSDIS_CFLAGS := @HSDIS_CFLAGS@
 HSDIS_LDFLAGS := @HSDIS_LDFLAGS@
 HSDIS_LIBS := @HSDIS_LIBS@
 CAPSTONE_ARCH_AARCH64_NAME := @CAPSTONE_ARCH_AARCH64_NAME@
+DEFAULT_PRINT_ASSEMBLY_OPTIONS := @DEFAULT_PRINT_ASSEMBLY_OPTIONS@
 
 # The boot jdk to use. This is overridden in bootcycle-spec.gmk. Make sure to keep
 # it in sync.
@@ -529,6 +534,7 @@ CFLAGS_WARNINGS_ARE_ERRORS := @CFLAGS_WARNINGS_ARE_ERRORS@
 DISABLED_WARNINGS := @DISABLED_WARNINGS@
 DISABLED_WARNINGS_C := @DISABLED_WARNINGS_C@
 DISABLED_WARNINGS_CXX := @DISABLED_WARNINGS_CXX@
+CFLAGS_CONVERSION_WARNINGS := @CFLAGS_CONVERSION_WARNINGS@
 
 # A global flag (true or false) determining if native warnings are considered errors.
 WARNINGS_AS_ERRORS := @WARNINGS_AS_ERRORS@
@@ -539,7 +545,7 @@ ADLC_LANGSTD_CXXFLAGS := @ADLC_LANGSTD_CXXFLAGS@
 ADLC_LDFLAGS := @ADLC_LDFLAGS@
 
 # Tools that potentially need to be cross compilation aware.
-CC := @CCACHE@ @ICECC@ @CC@
+CC := @SCCACHE@ @CCACHE@ @ICECC@ @CC@
 
 # CFLAGS used to compile the jdk native libraries (C-code)
 CFLAGS_JDKLIB := @CFLAGS_JDKLIB@
@@ -565,7 +571,7 @@ EXTRA_CXXFLAGS := @EXTRA_CXXFLAGS@
 EXTRA_LDFLAGS := @EXTRA_LDFLAGS@
 EXTRA_ASFLAGS := @EXTRA_ASFLAGS@
 
-CXX := @CCACHE@ @ICECC@ @CXX@
+CXX := @SCCACHE@ @CCACHE@ @ICECC@ @CXX@
 
 CPP := @CPP@
 
@@ -633,6 +639,7 @@ METALLIB := @METALLIB@
 COMPILE_WITH_DEBUG_SYMBOLS := @COMPILE_WITH_DEBUG_SYMBOLS@
 COPY_DEBUG_SYMBOLS := @COPY_DEBUG_SYMBOLS@
 ZIP_EXTERNAL_DEBUG_SYMBOLS := @ZIP_EXTERNAL_DEBUG_SYMBOLS@
+OBJCOPY_COMPRESS_FLAGS := @OBJCOPY_COMPRESS_FLAGS@
 
 CFLAGS_DEBUG_SYMBOLS := @CFLAGS_DEBUG_SYMBOLS@
 ASFLAGS_DEBUG_SYMBOLS := @ASFLAGS_DEBUG_SYMBOLS@
@@ -733,6 +740,7 @@ RCFLAGS := @RCFLAGS@
 AWK := @AWK@
 BASENAME := @BASENAME@
 CAT := @CAT@
+SCCACHE := @SCCACHE@
 CCACHE := @CCACHE@
 # CD is going away, but remains to cater for legacy makefiles.
 CD := cd
@@ -841,7 +849,6 @@ PNG_CFLAGS := @PNG_CFLAGS@
 
 # Misc
 INCLUDE_SA := @INCLUDE_SA@
-INCLUDE_JVMCI := @INCLUDE_JVMCI@
 INCLUDE_COMPILER2 := @INCLUDE_COMPILER2@
 
 OS_VERSION_MAJOR := @OS_VERSION_MAJOR@
@@ -889,14 +896,6 @@ DOCS_OUTPUTDIR := $(DOCS_JDK_IMAGE_DIR)
 STATIC_LIBS_IMAGE_SUBDIR := static-libs
 STATIC_LIBS_IMAGE_DIR := $(IMAGES_OUTPUTDIR)/$(STATIC_LIBS_IMAGE_SUBDIR)
 
-# Graal static libs image
-STATIC_LIBS_GRAAL_IMAGE_SUBDIR := static-libs-graal
-STATIC_LIBS_GRAAL_IMAGE_DIR := $(IMAGES_OUTPUTDIR)/$(STATIC_LIBS_GRAAL_IMAGE_SUBDIR)
-
-# Graal builder image
-GRAAL_BUILDER_IMAGE_SUBDIR := graal-builder-jdk
-GRAAL_BUILDER_IMAGE_DIR := $(IMAGES_OUTPUTDIR)/$(GRAAL_BUILDER_IMAGE_SUBDIR)
-
 # Macosx bundles directory definitions
 JDK_MACOSX_BUNDLE_SUBDIR := jdk-bundle
 JRE_MACOSX_BUNDLE_SUBDIR := jre-bundle
@@ -941,7 +940,6 @@ DOCS_JDK_BUNDLE_NAME := jdk-$(BASE_NAME)_doc-api-spec$(DEBUG_PART).tar.gz
 DOCS_JAVASE_BUNDLE_NAME := javase-$(BASE_NAME)_doc-api-spec$(DEBUG_PART).tar.gz
 DOCS_REFERENCE_BUNDLE_NAME := jdk-reference-$(BASE_NAME)_doc-api-spec$(DEBUG_PART).tar.gz
 STATIC_LIBS_BUNDLE_NAME := jdk-$(BASE_NAME)_bin-static-libs$(DEBUG_PART).tar.gz
-STATIC_LIBS_GRAAL_BUNDLE_NAME := jdk-$(BASE_NAME)_bin-static-libs-graal$(DEBUG_PART).tar.gz
 STATIC_JDK_BUNDLE_NAME := static-jdk-$(BASE_NAME)_bin$(DEBUG_PART).$(JDK_BUNDLE_EXTENSION)
 JCOV_BUNDLE_NAME := jdk-jcov-$(BASE_NAME)_bin$(DEBUG_PART).$(JDK_BUNDLE_EXTENSION)
 

make/autoconf/toolchain.m4

@@ -692,6 +692,8 @@ AC_DEFUN_ONCE([TOOLCHAIN_DETECT_TOOLCHAIN_EXTRA],
         AC_MSG_NOTICE([A full XCode is required to build the JDK (not only command line tools)])
         AC_MSG_NOTICE([If you have XCode installed, you might need to reset the Xcode active developer directory])
         AC_MSG_NOTICE([using 'sudo xcode-select -r'])
+        AC_MSG_NOTICE([Starting with Xcode 26, the Metal toolchain is no longer bundled with Xcode.])
+        AC_MSG_NOTICE([Try installing it with 'xcodebuild -downloadComponent MetalToolchain'])
         AC_MSG_ERROR([XCode tool 'metal' neither found in path nor with xcrun])
       else
         AC_MSG_RESULT([yes, will be using '$METAL'])

make/autoconf/toolchain_microsoft.m4

@@ -217,10 +217,12 @@ AC_DEFUN([TOOLCHAIN_FIND_VISUAL_STUDIO_BAT_FILE],
     TOOLCHAIN_CHECK_POSSIBLE_VISUAL_STUDIO_ROOT([$TARGET_CPU], [$VS_VERSION],
         [$PROGRAMFILES_X86/$VS_INSTALL_DIR], [well-known name])
   fi
+  # Derive system drive root from CMD (which is at <drive>/windows/system32/cmd.exe)
+  WINSYSDRIVE_ROOT="$(dirname "$(dirname "$(dirname "$CMD")")")"
   TOOLCHAIN_CHECK_POSSIBLE_VISUAL_STUDIO_ROOT([$TARGET_CPU], [$VS_VERSION],
-      [c:/program files/$VS_INSTALL_DIR], [well-known name])
+      [$WINSYSDRIVE_ROOT/program files/$VS_INSTALL_DIR], [well-known name])
   TOOLCHAIN_CHECK_POSSIBLE_VISUAL_STUDIO_ROOT([$TARGET_CPU], [$VS_VERSION],
-      [c:/program files (x86)/$VS_INSTALL_DIR], [well-known name])
+      [$WINSYSDRIVE_ROOT/program files (x86)/$VS_INSTALL_DIR], [well-known name])
   if test "x$SDK_INSTALL_DIR" != x; then
     if test "x$ProgramW6432" != x; then
       TOOLCHAIN_CHECK_POSSIBLE_WIN_SDK_ROOT([$TARGET_CPU], [$VS_VERSION],
@@ -235,9 +237,9 @@ AC_DEFUN([TOOLCHAIN_FIND_VISUAL_STUDIO_BAT_FILE],
           [$PROGRAMFILES/$SDK_INSTALL_DIR], [well-known name])
     fi
     TOOLCHAIN_CHECK_POSSIBLE_WIN_SDK_ROOT([$TARGET_CPU], [$VS_VERSION],
-        [c:/program files/$SDK_INSTALL_DIR], [well-known name])
+        [$WINSYSDRIVE_ROOT/program files/$SDK_INSTALL_DIR], [well-known name])
     TOOLCHAIN_CHECK_POSSIBLE_WIN_SDK_ROOT([$TARGET_CPU], [$VS_VERSION],
-        [c:/program files (x86)/$SDK_INSTALL_DIR], [well-known name])
+        [$WINSYSDRIVE_ROOT/program files (x86)/$SDK_INSTALL_DIR], [well-known name])
   fi
 
   VCVARS_VER=auto
@@ -338,7 +340,7 @@ AC_DEFUN([TOOLCHAIN_EXTRACT_VISUAL_STUDIO_ENV],
   OLDPATH="$PATH"
   # Make sure we only capture additions to PATH needed by VS.
   # Clear out path, but need system dir present for vsvars cmd file to be able to run
-  export PATH=$WINENV_PREFIX/c/windows/system32
+  export PATH="$(dirname "$CMD")"
   # The "| cat" is to stop SetEnv.Cmd to mess with system colors on some systems
   # We can't pass -vcvars_ver=$VCVARS_VER here because cmd.exe eats all '='
   # in bat file arguments. :-(

make/common/JavaCompilation.gmk

@@ -148,8 +148,8 @@ endef
 #   BIN store classes here
 #   MODULE Name of module being compiled. If set, classes are put in BIN/MODULE.
 #   CLASSPATH a list of additional entries to set as classpath to javac
-#   INCLUDES myapp.foo means will only compile java files in myapp.foo or any of its sub-packages.
-#   EXCLUDES myapp.foo means will do not compile java files in myapp.foo or any of its sub-packages.
+#   INCLUDES myapp/foo means will only compile java files in myapp.foo or any of its sub-packages.
+#   EXCLUDES myapp/foo means will do not compile java files in myapp.foo or any of its sub-packages.
 #   COPY .prp means copy all prp files to the corresponding package in BIN.
 #   COPY_FILES myapp/foo/setting.txt means copy this file over to the package myapp/foo
 #   CLEAN .properties means copy and clean all properties file to the corresponding package in BIN.

make/common/MakeBase.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -141,6 +141,66 @@ endef
 # Make sure logging is setup for everyone that includes MakeBase.gmk.
 $(eval $(call SetupLogging))
 
+################################################################################
+# Make does not have support for VARARGS, you can send variable amount
+# of arguments, but you can for example not append a list at the end.
+# It is therefore not easy to send the elements of a list of unknown
+# length as argument to a function. This can somewhat be worked around
+# by sending a list as an argument, and then interpreting each element
+# of the list as an argument to the function. However, Make is
+# limited, and using this method you can not easily send spaces.
+#
+# We need to quote strings for two reasons when sending them as
+# "variable append packs":
+#
+# 1) variable appends can include spaces, and those must be preserved
+# 2) variable appends can include assignment strings ":=", and those
+# must be quoted to a form so that we can recognise the "append pack".
+# We recognise an "append pack" by its lack of strict assignment ":="
+
+Q       := $(HASH)
+SpaceQ  := $(Q)s
+AppendQ := $(Q)+
+AssignQ := $(Q)a
+QQ      := $(Q)$(Q)
+
+# $(call Quote,echo "#trala:=") -> echo#s"##trala#a"
+Quote = $(subst :=,$(AssignQ),$(subst $(SPACE),$(SpaceQ),$(subst $(Q),$(QQ),$1)))
+
+# $(call Unquote,echo#s"##trala#a") -> echo "#trala:="
+Unquote = $(subst $(QQ),$(Q),$(subst $(SpaceQ),$(SPACE),$(subst $(AssignQ),:=,$1)))
+
+# $(call QuoteAppend,name,some value) -> name#+some#svalue
+# $(call QuoteAppend,bad+=name,some value) -> error
+QuoteAppend = $(if $(findstring +=,$1),$(error you can not have += in a variable name: "$1"),$(call Quote,$1)$(AppendQ)$(call Quote,$2))
+
+# $(call UnquoteAppendIndex,name#+some#svalue,1) -> name
+# $(call UnquoteAppendIndex,name#+some#svalue,2) -> some value
+UnquoteAppendIndex = $(call Unquote,$(word $2,$(subst $(AppendQ),$(SPACE),$1)))
+
+# $(call FilterFiles,dir,%.cpp) -> file1.cpp file2.cpp (without path)
+FilterFiles = $(filter $2,$(notdir $(call FindFiles,$1)))
+
+# $(call Unpack module_,file1.cpp_CXXFLAGS#+-Wconversion file2.cpp_CXXFLAGS#+-Wconversion) -> module_file1.cpp_CXXFLAGS += -Wconversion
+#                                                                                             module_file2.cpp_CXXFLAGS += -Wconversion
+Unpack = $(foreach pair,$2,$1$(call UnquoteAppendIndex,$(pair),1) += $(call UnquoteAppendIndex,$(pair),2)$(NEWLINE))
+
+# This macro takes four arguments:
+# $1: directory where to find files (striped), example: $(TOPDIR)/src/hotspot/share/gc/g1
+# $2: filter to match what to keep (striped), example: g1Concurrent%.cpp
+# $3: what flags to override (striped), example: _CXXFLAGS
+# $4: what value to append to the flag (striped), example: $(CFLAGS_CONVERSION_WARNINGS)
+#
+# The result will be a quoted string that can be unpacked to a list of
+# variable appendings (see macro Unpack above). You do not need to take
+# care of unpacking, it is done in NamedParamsMacroTemplate.
+#
+# This feature should only be used for warnings that we want to
+# incrementally add to the rest of the code base.
+#
+# $(call ExtendFlags,dir,%.cpp,_CXXFLAGS,-Wconversion) -> file1.cpp_CXXFLAGS#+-Wconversion file2.cpp_CXXFLAGS#+-Wconversion
+ExtendFlags = $(foreach file,$(call FilterFiles,$(strip $1),$(strip $2)),$(call QuoteAppend,$(file)$(strip $3),$(strip $4)))
+
 ################################################################################
 
 MAX_PARAMS := 96
@@ -166,7 +226,10 @@ define NamedParamsMacroTemplate
       Too many named arguments to macro, please update MAX_PARAMS in MakeBase.gmk))
   # Iterate over 2 3 4... and evaluate the named parameters with $1_ as prefix
   $(foreach i, $(PARAM_SEQUENCE), $(if $(strip $($i)), \
-    $(strip $1)_$(strip $(call EscapeHash, $(call DoubleDollar, $($i))))$(NEWLINE)))
+    $(if $(findstring :=,$($i)), \
+      $(strip $1)_$(strip $(call EscapeHash, $(call DoubleDollar, $($i))))$(NEWLINE), \
+      $(call Unpack,$(strip $1)_,$($i)))))
+
   # Debug print all named parameter names and values
   $(if $(findstring $(LOG_LEVEL), trace), \
     $(info $0 $(strip $1) $(foreach i, $(PARAM_SEQUENCE), \

make/common/Modules.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2014, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2014, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -54,13 +54,6 @@ ifeq ($(INCLUDE_SA), false)
   MODULES_FILTER += jdk.hotspot.agent
 endif
 
-# Filter out jvmci specific modules if jvmci is disabled
-ifeq ($(INCLUDE_JVMCI), false)
-  MODULES_FILTER += jdk.internal.vm.ci
-  MODULES_FILTER += jdk.graal.compiler
-  MODULES_FILTER += jdk.graal.compiler.management
-endif
-
 # jpackage is only on windows, macosx, and linux
 ifeq ($(call isTargetOs, windows macosx linux), false)
   MODULES_FILTER += jdk.jpackage
@@ -75,6 +68,12 @@ GENERATED_SRC_DIRS += \
     $(SUPPORT_OUTPUTDIR)/gensrc \
     #
 
+# Directories in which generated preview classes may exist.
+# Currently this is restricted to generated value classes, but can be extended.
+GENERATED_PREVIEW_SUBDIRS += \
+    $(SUPPORT_OUTPUTDIR)/gensrc-valueclasses \
+    #
+
 TOP_SRC_DIRS += \
     $(TOPDIR)/src \
     #
@@ -144,6 +143,13 @@ FindModuleSrcDirs = \
         $(addsuffix /$(strip $1), $(GENERATED_SRC_DIRS) $(IMPORT_MODULES_SRC)) \
         $(foreach sub, $(SRC_SUBDIRS), $(addsuffix /$(strip $1)/$(sub), $(TOP_SRC_DIRS)))))
 
+# Find preview class source dirs for a particular module.
+# Currently this is restricted to generated value classes, but can be extended.
+# $1 - Module to find source dirs for
+FindModulePreviewSrcDirs = \
+    $(strip $(wildcard \
+        $(addsuffix /$(strip $1), $(GENERATED_PREVIEW_SUBDIRS))))
+
 # Find all specs dirs for a particular module
 # $1 - Module to find specs dirs for
 FindModuleSpecsDirs = \
@@ -166,6 +172,13 @@ GetModuleSrcPath = \
         $(addsuffix /*, $(GENERATED_SRC_DIRS) $(IMPORT_MODULES_SRC)) \
         $(foreach sub, $(SRC_SUBDIRS), $(addsuffix /*/$(sub), $(TOP_SRC_DIRS))))
 
+# Construct the complete module source path for preview classes.
+# Currently this is restricted to generated value classes, but can be extended.
+GetModulePreviewSrcPath = \
+    $(call PathList, \
+        $(addsuffix /*, $(GENERATED_PREVIEW_SUBDIRS) $(GENERATED_SRC_DIRS) $(IMPORT_MODULES_SRC)) \
+        $(foreach sub, $(SRC_SUBDIRS), $(addsuffix /*/$(sub), $(TOP_SRC_DIRS))))
+
 ################################################################################
 # Extract module dependencies from module-info.java files, both normal
 # dependencies ("requires"), and indirect exports ("requires transitive").

make/common/modules/GensrcStreamPreProcessing.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2025, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -33,9 +33,12 @@ ifeq ($(INCLUDE), true)
 include Execute.gmk
 include $(TOPDIR)/make/ToolsJdk.gmk
 
-NON_BYTE_NUMBER_TYPES := char short int long float double
+NON_BYTE_INTEGER_TYPES := char short int long
+NON_BYTE_NUMBER_TYPES := $(NON_BYTE_INTEGER_TYPES) float double
 NUMBER_TYPES := byte $(NON_BYTE_NUMBER_TYPES)
+INTEGER_NUMBER_TYPES := byte $(NON_BYTE_INTEGER_TYPES)
 PRIMITIVE_TYPES := boolean $(NUMBER_TYPES)
+BITWISE_PRIMITIVE_TYPES := boolean $(INTEGER_NUMBER_TYPES)
 
 ################################################################################
 # The Conv function converts a type given as first argument (as a normal Java
@@ -116,7 +119,7 @@ Conv_A = \
 
 # Return integer type with same size as the type
 Conv_memtype = \
-  $(if $(filter float, $1), int, $(if $(filter double, $1), long, $1))
+  $(if $(filter float, $1), int, $(if $(filter double, $1), long, $(if $(filter boolean, $1), byte, $1)))
 
 # Return capitalized integer type with same size as the type
 Conv_Memtype = \

make/common/modules/LauncherCommon.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -35,11 +35,17 @@ include ProcessMarkdown.gmk
 include $(TOPDIR)/make/ToolsJdk.gmk
 
 LAUNCHER_SRC := $(TOPDIR)/src/java.base/share/native/launcher
+
 LAUNCHER_CFLAGS += -I$(TOPDIR)/src/java.base/share/native/launcher \
     -I$(TOPDIR)/src/java.base/share/native/libjli \
     -I$(TOPDIR)/src/java.base/$(OPENJDK_TARGET_OS_TYPE)/native/libjli \
     -I$(TOPDIR)/src/java.base/$(OPENJDK_TARGET_OS)/native/libjli \
     #
+
+ifeq ($(call isTargetOs, aix), true)
+  LAUNCHER_CFLAGS += -I$(TOPDIR)/src/java.base/aix/native/include
+endif
+
 MACOSX_PLIST_DIR := $(TOPDIR)/src/java.base/macosx/native/launcher
 JAVA_MANIFEST := $(TOPDIR)/src/java.base/windows/native/launcher/java.manifest
 

make/common/native/Link.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -189,7 +189,7 @@ define CreateDynamicLibraryOrExecutable
             # This cannot be run separately since it updates the original target
             # file.
 	    $$(call ExecuteWithLog, $$($1_OBJECT_DIR)/$$($1_SAFE_NAME)_create_debuginfo, \
-	        $$($1_OBJCOPY) --only-keep-debug $$($1_TARGET) $$($1_DEBUGINFO_FILES))
+	        $$($1_OBJCOPY) $(OBJCOPY_COMPRESS_FLAGS) --only-keep-debug $$($1_TARGET) $$($1_DEBUGINFO_FILES))
 	    $$(CHMOD) -x $$($1_DEBUGINFO_FILES)
           else ifeq ($(call isTargetOs, aix), true)
             # AIX does not provide the equivalent of objcopy to extract debug

make/conf/build-module-sets.conf

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2014, 2021, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2014, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -45,5 +45,4 @@ LANGTOOLS_MODULES= \
 # These models require buildtools-hotspot to process for gensrc
 HOTSPOT_MODULES= \
     jdk.hotspot.agent \
-    jdk.internal.vm.ci \
     #

make/conf/github-actions.conf

@@ -26,24 +26,32 @@
 # Versions and download locations for dependencies used by GitHub Actions (GHA)
 
 GTEST_VERSION=1.14.0
-JTREG_VERSION=8.2.1+1
+JTREG_VERSION=8.3+1
 
 LINUX_X64_BOOT_JDK_EXT=tar.gz
-LINUX_X64_BOOT_JDK_URL=https://download.java.net/java/GA/jdk25/bd75d5f9689641da8e1daabeccb5528b/36/GPL/openjdk-25_linux-x64_bin.tar.gz
-LINUX_X64_BOOT_JDK_SHA256=59cdcaf255add4721de38eb411d4ecfe779356b61fb671aee63c7dec78054c2b
+LINUX_X64_BOOT_JDK_URL=https://download.java.net/java/GA/jdk26/c3cc523845074aa0af4f5e1e1ed4151d/35/GPL/openjdk-26_linux-x64_bin.tar.gz
+LINUX_X64_BOOT_JDK_SHA256=83c78367f8c81257beef72aca4bbbf8e6dac8ca2b3a4546a85879a09e6e4e128
+
+LINUX_AARCH64_BOOT_JDK_EXT=tar.gz
+LINUX_AARCH64_BOOT_JDK_URL=https://download.java.net/java/GA/jdk26/c3cc523845074aa0af4f5e1e1ed4151d/35/GPL/openjdk-26_linux-aarch64_bin.tar.gz
+LINUX_AARCH64_BOOT_JDK_SHA256=403ccf451e88d0be9e1dec129fcb9318de9752121e0eb92dfa9a8cf06f249007
 
 ALPINE_LINUX_X64_BOOT_JDK_EXT=tar.gz
-ALPINE_LINUX_X64_BOOT_JDK_URL=https://github.com/adoptium/temurin25-binaries/releases/download/jdk-25%2B36/OpenJDK25U-jdk_x64_alpine-linux_hotspot_25_36.tar.gz
-ALPINE_LINUX_X64_BOOT_JDK_SHA256=637e47474d411ed86134f413af7d5fef4180ddb0bf556347b7e74a88cf8904c8
+ALPINE_LINUX_X64_BOOT_JDK_URL=https://github.com/adoptium/temurin26-binaries/releases/download/jdk-26%2B35/OpenJDK26U-jdk_x64_alpine-linux_hotspot_26_35.tar.gz
+ALPINE_LINUX_X64_BOOT_JDK_SHA256=c105e581fdccb4e7120d889235d1ad8d5b2bed0af4972bc881e0a8ba687c94a4
 
 MACOS_AARCH64_BOOT_JDK_EXT=tar.gz
-MACOS_AARCH64_BOOT_JDK_URL=https://download.java.net/java/GA/jdk25/bd75d5f9689641da8e1daabeccb5528b/36/GPL/openjdk-25_macos-aarch64_bin.tar.gz
-MACOS_AARCH64_BOOT_JDK_SHA256=2006337bf326fdfdf6117081751ba38c1c8706d63419ecac7ff102ff7c776876
+MACOS_AARCH64_BOOT_JDK_URL=https://download.java.net/java/GA/jdk26/c3cc523845074aa0af4f5e1e1ed4151d/35/GPL/openjdk-26_macos-aarch64_bin.tar.gz
+MACOS_AARCH64_BOOT_JDK_SHA256=254586bcd1bf6dcd125ad667ac32562cb1e2ab1abf3a61fb117b6fabb571e765
 
 MACOS_X64_BOOT_JDK_EXT=tar.gz
-MACOS_X64_BOOT_JDK_URL=https://download.java.net/java/GA/jdk25/bd75d5f9689641da8e1daabeccb5528b/36/GPL/openjdk-25_macos-x64_bin.tar.gz
-MACOS_X64_BOOT_JDK_SHA256=47482ad9888991ecac9b2bcc131e2b53ff78aff275104cef85f66252308e8a09
+MACOS_X64_BOOT_JDK_URL=https://download.java.net/java/GA/jdk26/c3cc523845074aa0af4f5e1e1ed4151d/35/GPL/openjdk-26_macos-x64_bin.tar.gz
+MACOS_X64_BOOT_JDK_SHA256=8642b89d889c14ede2c446fd5bbe3621c8a3082e3df02013fd1658e39f52929a
 
 WINDOWS_X64_BOOT_JDK_EXT=zip
-WINDOWS_X64_BOOT_JDK_URL=https://download.java.net/java/GA/jdk25/bd75d5f9689641da8e1daabeccb5528b/36/GPL/openjdk-25_windows-x64_bin.zip
-WINDOWS_X64_BOOT_JDK_SHA256=85bcc178461e2cb3c549ab9ca9dfa73afd54c09a175d6510d0884071867137d3
+WINDOWS_X64_BOOT_JDK_URL=https://download.java.net/java/GA/jdk26/c3cc523845074aa0af4f5e1e1ed4151d/35/GPL/openjdk-26_windows-x64_bin.zip
+WINDOWS_X64_BOOT_JDK_SHA256=2dd2d92c9374cd49a120fe9d916732840bf6bb9f0e0cc29794917a3c08b99c5f
+
+WINDOWS_AARCH64_BOOT_JDK_EXT=zip
+WINDOWS_AARCH64_BOOT_JDK_URL=https://github.com/adoptium/temurin26-binaries/releases/download/jdk-26%2B35-ea-beta/OpenJDK26U-jdk_aarch64_windows_hotspot_26_35-ea.zip
+WINDOWS_AARCH64_BOOT_JDK_SHA256=4892cd9714e222947de1a7415a696f43adf691560522dc5858c0a8af070912c0

make/conf/jib-profiles.js

@@ -387,8 +387,8 @@ var getJibProfilesCommon = function (input, data) {
         };
     };
 
-    common.boot_jdk_version = "25";
-    common.boot_jdk_build_number = "37";
+    common.boot_jdk_version = "26";
+    common.boot_jdk_build_number = "35";
     common.boot_jdk_home = input.get("boot_jdk", "install_path") + "/jdk-"
         + common.boot_jdk_version
         + (input.build_os == "macosx" ? ".jdk/Contents/Home" : "");
@@ -644,7 +644,7 @@ var getJibProfilesProfiles = function (input, common, data) {
     // Bootcycle profiles runs the build with itself as the boot jdk. This can
     // be done in two ways. Either using the builtin bootcycle target in the
     // build system. Or by supplying the main jdk build as bootjdk to configure.
-    [ "linux-x64", "macosx-x64", "windows-x64", "linux-aarch64" ]
+    [ "linux-x64", "macosx-aarch64", "macosx-x64", "windows-x64", "linux-aarch64" ]
         .forEach(function (name) {
             var bootcycleName = name + "-bootcycle";
             var bootcyclePrebuiltName = name + "-bootcycle-prebuilt";
@@ -1174,9 +1174,9 @@ var getJibProfilesDependencies = function (input, common) {
         jtreg: {
             server: "jpg",
             product: "jtreg",
-            version: "8.2.1",
+            version: "8.3",
             build_number: "1",
-            file: "bundles/jtreg-8.2.1+1.zip",
+            file: "bundles/jtreg-8.3+1.zip",
             environment_name: "JT_HOME",
             environment_path: input.get("jtreg", "home_path") + "/bin",
             configure_args: "--with-jtreg=" + input.get("jtreg", "home_path"),
@@ -1192,8 +1192,8 @@ var getJibProfilesDependencies = function (input, common) {
             server: "jpg",
             product: "jcov",
             version: "3.0",
-            build_number: "5",
-            file: "bundles/jcov-3.0+5.zip",
+            build_number: "6",
+            file: "bundles/jcov-3.0+6.zip",
             environment_name: "JCOV_HOME",
         },
 

make/conf/module-loader-map.conf

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2014, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2014, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -28,7 +28,7 @@
 # PLATFORM_MODULES are modules defined by the platform loader
 #
 # All other modules not declared below are defined by the application loader
-# and are not included in JRE.
+# and are not included in the JDK runtime image.
 
 BOOT_MODULES= \
     java.base \
@@ -44,7 +44,6 @@ BOOT_MODULES= \
     java.security.sasl \
     java.xml \
     jdk.incubator.vector \
-    jdk.internal.vm.ci \
     jdk.jfr \
     jdk.management \
     jdk.management.jfr \
@@ -53,15 +52,12 @@ BOOT_MODULES= \
     jdk.nio.mapmode \
     jdk.sctp \
     jdk.unsupported \
-    jdk.naming.rmi \
     #
 
 # Modules that directly or indirectly requiring upgradeable modules
 # should carefully be considered if it should be upgradeable or not.
 UPGRADEABLE_PLATFORM_MODULES= \
     java.compiler \
-    jdk.graal.compiler \
-    jdk.graal.compiler.management \
     #
 
 PLATFORM_MODULES= \
@@ -81,6 +77,7 @@ PLATFORM_MODULES= \
     jdk.httpserver \
     jdk.localedata \
     jdk.naming.dns \
+    jdk.naming.rmi \
     jdk.security.auth \
     jdk.security.jgss \
     jdk.xml.dom \
@@ -107,7 +104,6 @@ NATIVE_ACCESS_MODULES= \
     jdk.crypto.mscapi \
     jdk.hotspot.agent \
     jdk.internal.le \
-    jdk.internal.vm.ci \
     jdk.jdi \
     jdk.jfr \
     jdk.jpackage \

make/conf/version-numbers.conf

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -26,17 +26,17 @@
 # Default version, product, and vendor information to use,
 # unless overridden by configure
 
-DEFAULT_VERSION_FEATURE=27
+DEFAULT_VERSION_FEATURE=28
 DEFAULT_VERSION_INTERIM=0
 DEFAULT_VERSION_UPDATE=0
 DEFAULT_VERSION_PATCH=0
 DEFAULT_VERSION_EXTRA1=0
 DEFAULT_VERSION_EXTRA2=0
 DEFAULT_VERSION_EXTRA3=0
-DEFAULT_VERSION_DATE=2026-09-15
-DEFAULT_VERSION_CLASSFILE_MAJOR=71  # "`$EXPR $DEFAULT_VERSION_FEATURE + 44`"
+DEFAULT_VERSION_DATE=2027-03-23
+DEFAULT_VERSION_CLASSFILE_MAJOR=72  # "`$EXPR $DEFAULT_VERSION_FEATURE + 44`"
 DEFAULT_VERSION_CLASSFILE_MINOR=0
 DEFAULT_VERSION_DOCS_API_SINCE=11
-DEFAULT_ACCEPTABLE_BOOT_VERSIONS="25 26 27"
-DEFAULT_JDK_SOURCE_TARGET_VERSION=27
+DEFAULT_ACCEPTABLE_BOOT_VERSIONS="26 27 28"
+DEFAULT_JDK_SOURCE_TARGET_VERSION=28
 DEFAULT_PROMOTED_VERSION_PRE=ea

make/data/cldr/common/dtd/ldml.dtd

@@ -1,5 +1,5 @@
 <!--
-Copyright © 1991-2025 Unicode, Inc.
+Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)
@@ -454,7 +454,7 @@ CLDR data files are interpreted according to the LDML specification (http://unic
 
 <!-- ######################################################### -->
 
-<!ELEMENT characters ( alias | ( exemplarCharacters*, ellipsis*, moreInformation*, stopwords*, indexLabels*, mapping*, parseLenients*, special* ) ) >
+<!ELEMENT characters ( alias | ( exemplarCharacters*, ellipsis*, nestedBracketReplacement*, moreInformation*, stopwords*, indexLabels*, mapping*, parseLenients*, special* ) ) >
 <!ATTLIST characters draft (approved | contributed | provisional | unconfirmed | true | false) #IMPLIED >
     <!--@METADATA-->
     <!--@DEPRECATED-->
@@ -493,6 +493,16 @@ CLDR data files are interpreted according to the LDML specification (http://unic
 <!ATTLIST ellipsis references CDATA #IMPLIED >
     <!--@METADATA-->
 
+<!ELEMENT nestedBracketReplacement ( #PCDATA ) >
+<!ATTLIST nestedBracketReplacement bracket CDATA #REQUIRED >
+    <!--@MATCH:any-->
+<!ATTLIST nestedBracketReplacement alt NMTOKENS #IMPLIED >
+    <!--@MATCH:literal/variant-->
+<!ATTLIST nestedBracketReplacement draft (approved | contributed | provisional | unconfirmed) #IMPLIED >
+    <!--@METADATA-->
+<!ATTLIST nestedBracketReplacement references CDATA #IMPLIED >
+    <!--@METADATA-->
+
 <!ELEMENT moreInformation ( #PCDATA ) >
 <!ATTLIST moreInformation alt NMTOKENS #IMPLIED >
     <!--@MATCH:literal/variant-->

make/data/cldr/common/main/aa.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/aa_DJ.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/aa_ER.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/aa_ET.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/ab.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/ab_GE.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/af.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/af_NA.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/af_ZA.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/agq.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/agq_CM.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/ak.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)
@@ -583,7 +583,7 @@ CLDR data files are interpreted according to the LDML specification (http://unic
 			<type key="collation" type="standard">Nyiyie Kwan Susudua</type>
 			<type key="collation" type="standard" scope="core">Susudua</type>
 			<type key="hc" type="h11">Nnɔnhwere 12 Sestɛm (0–11)</type>
-			<type key="hc" type="h12">Nnɔnhwere 12 Sestɛm (1–12</type>
+			<type key="hc" type="h12">Nnɔnhwere 12 Sestɛm (1–12)</type>
 			<type key="hc" type="h23">Nnɔnhwere 24 Sestɛm (0–23)</type>
 			<type key="hc" type="h24">Nnɔnhwere 24 Sestɛm (0–24)</type>
 			<type key="lb" type="loose">Line Break Nhyehyɛeɛ a Emu Yɛ Mmrɛ</type>

make/data/cldr/common/main/ak_GH.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/am.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)
@@ -1261,6 +1261,7 @@ Warnings: All cp values have U+FE0F characters removed. See /annotationsDerived/
 						<dateFormatItem id="GyMMMd">MMM d፣ y G</dateFormatItem>
 						<dateFormatItem id="GyMMMEd">E MMM d፣ y G</dateFormatItem>
 						<dateFormatItem id="H">H</dateFormatItem>
+						<dateFormatItem id="Hv">H v</dateFormatItem>
 						<dateFormatItem id="Md">M/d</dateFormatItem>
 						<dateFormatItem id="MEd">E፣ M/d</dateFormatItem>
 						<dateFormatItem id="MMMEd">E፣ MMM d</dateFormatItem>
@@ -1594,6 +1595,7 @@ Warnings: All cp values have U+FE0F characters removed. See /annotationsDerived/
 						<dateFormatItem id="hm">a h:mm</dateFormatItem>
 						<dateFormatItem id="hms">a h:mm:ss</dateFormatItem>
 						<dateFormatItem id="hv">a h v</dateFormatItem>
+						<dateFormatItem id="Hv">H v</dateFormatItem>
 						<dateFormatItem id="Md">d/M</dateFormatItem>
 						<dateFormatItem id="MEd">E፣ d/M</dateFormatItem>
 						<dateFormatItem id="MMMEd">E፣ MMM d</dateFormatItem>

make/data/cldr/common/main/am_ET.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/an.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/an_ES.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/ann.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/ann_NG.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/apc.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/apc_SY.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/ar.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/ar_001.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)

make/data/cldr/common/main/ar_AE.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE ldml SYSTEM "../../common/dtd/ldml.dtd">
-<!-- Copyright © 1991-2025 Unicode, Inc.
+<!-- Copyright © 1991-2026 Unicode, Inc.
 For terms of use, see http://www.unicode.org/copyright.html
 SPDX-License-Identifier: Unicode-3.0
 CLDR data files are interpreted according to the LDML specification (http://unicode.org/reports/tr35/)