gendwarfksyms: Expand structure types
Recursively expand DWARF structure types, i.e. structs, unions, and
enums. Also include relevant DWARF attributes in type strings to
encode structure layout, for example.
Example output with --dump-dies:
subprogram (
formal_parameter structure_type &str {
member pointer_type {
base_type u8 byte_size(1) encoding(7)
} data_ptr data_member_location(0) ,
member base_type usize byte_size(8) encoding(7) length data_member_location(8)
} byte_size(16) alignment(8) msg
)
-> base_type void
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Petr Pavlu <petr.pavlu@suse.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Sami Tolvanen
committed by
Masahiro Yamada
Masahiro Yamada
parent
c772f1d1ea
commit
f6bb92455a
@@ -208,9 +208,14 @@ static void process_fqn(struct die *cache, Dwarf_Die *die)
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value); \
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}
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DEFINE_PROCESS_UDATA_ATTRIBUTE(accessibility)
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DEFINE_PROCESS_UDATA_ATTRIBUTE(alignment)
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DEFINE_PROCESS_UDATA_ATTRIBUTE(bit_size)
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DEFINE_PROCESS_UDATA_ATTRIBUTE(byte_size)
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DEFINE_PROCESS_UDATA_ATTRIBUTE(encoding)
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DEFINE_PROCESS_UDATA_ATTRIBUTE(data_bit_offset)
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DEFINE_PROCESS_UDATA_ATTRIBUTE(data_member_location)
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DEFINE_PROCESS_UDATA_ATTRIBUTE(discr_value)
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/* Match functions -- die_match_callback_t */
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#define DEFINE_MATCH(type) \
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@@ -219,7 +224,9 @@ DEFINE_PROCESS_UDATA_ATTRIBUTE(encoding)
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return dwarf_tag(die) == DW_TAG_##type##_type; \
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}
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DEFINE_MATCH(enumerator)
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DEFINE_MATCH(formal_parameter)
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DEFINE_MATCH(member)
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DEFINE_MATCH(subrange)
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bool match_all(Dwarf_Die *die)
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@@ -298,6 +305,10 @@ static void __process_list_type(struct state *state, struct die *cache,
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process(cache, " ");
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process(cache, name);
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}
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process_accessibility_attr(cache, die);
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process_bit_size_attr(cache, die);
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process_data_bit_offset_attr(cache, die);
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process_data_member_location_attr(cache, die);
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}
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#define DEFINE_PROCESS_LIST_TYPE(type) \
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@@ -308,6 +319,7 @@ static void __process_list_type(struct state *state, struct die *cache,
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}
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DEFINE_PROCESS_LIST_TYPE(formal_parameter)
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DEFINE_PROCESS_LIST_TYPE(member)
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/* Container types with DW_AT_type */
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static void __process_type(struct state *state, struct die *cache,
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@@ -340,6 +352,7 @@ DEFINE_PROCESS_TYPE(reference)
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DEFINE_PROCESS_TYPE(restrict)
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DEFINE_PROCESS_TYPE(rvalue_reference)
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DEFINE_PROCESS_TYPE(shared)
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DEFINE_PROCESS_TYPE(template_type_parameter)
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DEFINE_PROCESS_TYPE(volatile)
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DEFINE_PROCESS_TYPE(typedef)
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@@ -393,6 +406,107 @@ static void process_subroutine_type(struct state *state, struct die *cache,
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__process_subroutine_type(state, cache, die, "subroutine_type");
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}
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static void process_variant_type(struct state *state, struct die *cache,
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Dwarf_Die *die)
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{
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process_list_comma(state, cache);
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process(cache, "variant {");
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process_linebreak(cache, 1);
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check(process_die_container(state, cache, die, process_type,
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match_member_type));
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process_linebreak(cache, -1);
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process(cache, "}");
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process_discr_value_attr(cache, die);
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}
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static void process_variant_part_type(struct state *state, struct die *cache,
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Dwarf_Die *die)
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{
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process_list_comma(state, cache);
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process(cache, "variant_part {");
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process_linebreak(cache, 1);
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check(process_die_container(state, cache, die, process_type,
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match_all));
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process_linebreak(cache, -1);
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process(cache, "}");
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}
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static int ___process_structure_type(struct state *state, struct die *cache,
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Dwarf_Die *die)
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{
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switch (dwarf_tag(die)) {
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case DW_TAG_member:
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case DW_TAG_variant_part:
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return check(process_type(state, cache, die));
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case DW_TAG_class_type:
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case DW_TAG_enumeration_type:
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case DW_TAG_structure_type:
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case DW_TAG_template_type_parameter:
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case DW_TAG_union_type:
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case DW_TAG_subprogram:
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/* Skip non-member types, including member functions */
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return 0;
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default:
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error("unexpected structure_type child: %x", dwarf_tag(die));
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}
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}
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static void __process_structure_type(struct state *state, struct die *cache,
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Dwarf_Die *die, const char *type,
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die_callback_t process_func,
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die_match_callback_t match_func)
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{
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process(cache, type);
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process_fqn(cache, die);
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process(cache, " {");
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process_linebreak(cache, 1);
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check(process_die_container(state, cache, die, process_func,
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match_func));
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process_linebreak(cache, -1);
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process(cache, "}");
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process_byte_size_attr(cache, die);
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process_alignment_attr(cache, die);
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}
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#define DEFINE_PROCESS_STRUCTURE_TYPE(structure) \
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static void process_##structure##_type( \
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struct state *state, struct die *cache, Dwarf_Die *die) \
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{ \
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__process_structure_type(state, cache, die, \
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#structure "_type", \
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___process_structure_type, \
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match_all); \
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}
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DEFINE_PROCESS_STRUCTURE_TYPE(class)
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DEFINE_PROCESS_STRUCTURE_TYPE(structure)
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DEFINE_PROCESS_STRUCTURE_TYPE(union)
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static void process_enumerator_type(struct state *state, struct die *cache,
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Dwarf_Die *die)
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{
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Dwarf_Word value;
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process_list_comma(state, cache);
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process(cache, "enumerator");
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process_fqn(cache, die);
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if (get_udata_attr(die, DW_AT_const_value, &value)) {
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process(cache, " = ");
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process_fmt(cache, "%" PRIu64, value);
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}
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}
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static void process_enumeration_type(struct state *state, struct die *cache,
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Dwarf_Die *die)
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{
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__process_structure_type(state, cache, die, "enumeration_type",
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process_type, match_enumerator_type);
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}
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static void process_base_type(struct state *state, struct die *cache,
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Dwarf_Die *die)
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{
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@@ -403,6 +517,16 @@ static void process_base_type(struct state *state, struct die *cache,
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process_alignment_attr(cache, die);
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}
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static void process_unspecified_type(struct state *state, struct die *cache,
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Dwarf_Die *die)
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{
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/*
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* These can be emitted for stand-alone assembly code, which means we
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* might run into them in vmlinux.o.
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*/
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process(cache, "unspecified_type");
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}
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static void process_cached(struct state *state, struct die *cache,
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Dwarf_Die *die)
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{
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@@ -463,17 +587,27 @@ static int process_type(struct state *state, struct die *parent, Dwarf_Die *die)
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PROCESS_TYPE(rvalue_reference)
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PROCESS_TYPE(shared)
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PROCESS_TYPE(volatile)
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/* Container types */
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PROCESS_TYPE(class)
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PROCESS_TYPE(structure)
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PROCESS_TYPE(union)
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PROCESS_TYPE(enumeration)
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/* Subtypes */
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PROCESS_TYPE(enumerator)
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PROCESS_TYPE(formal_parameter)
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PROCESS_TYPE(member)
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PROCESS_TYPE(subrange)
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PROCESS_TYPE(template_type_parameter)
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PROCESS_TYPE(variant)
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PROCESS_TYPE(variant_part)
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/* Other types */
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PROCESS_TYPE(array)
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PROCESS_TYPE(base)
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PROCESS_TYPE(subroutine)
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PROCESS_TYPE(typedef)
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PROCESS_TYPE(unspecified)
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default:
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debug("unimplemented type: %x", tag);
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break;
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error("unexpected type: %x", tag);
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}
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/* Update cache state and append to the parent (if any) */
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@@ -60,8 +60,13 @@ extern int dump_dies;
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#define checkp(expr) __check(expr, __res < 0)
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/* Consistent aliases (DW_TAG_<type>_type) for DWARF tags */
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#define DW_TAG_enumerator_type DW_TAG_enumerator
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#define DW_TAG_formal_parameter_type DW_TAG_formal_parameter
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#define DW_TAG_member_type DW_TAG_member
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#define DW_TAG_template_type_parameter_type DW_TAG_template_type_parameter
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#define DW_TAG_typedef_type DW_TAG_typedef
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#define DW_TAG_variant_part_type DW_TAG_variant_part
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#define DW_TAG_variant_type DW_TAG_variant
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/*
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* symbols.c
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