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Linux DWARF reader: Follow DW_AT_abstract_origin links to find function names.

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Without this patch, debugging information like the following will produce
FUNC records with no names, because the dumper (correctly) ignores the
DW_TAG_subprogram DIEs that lack DW_AT_low_pc/DW_AT_high_pc attributes, but
won't follow the DW_AT_abstract_origin link from the DIE that does have
code addresses to find its name.

 <1><168>: Abbrev Number: 5 (DW_TAG_class_type)
    <169>   DW_AT_name        : Foo	
 <2><183>: Abbrev Number: 7 (DW_TAG_subprogram)
    <185>   DW_AT_name        : Foo	
    <18b>   DW_AT_declaration : 1	
 <1><1b7>: Abbrev Number: 12 (DW_TAG_subprogram)
    <1b8>   DW_AT_specification: <0x183>	
    <1bc>   DW_AT_inline      : 2	(declared as inline but ignored)
 <1><1dc>: Abbrev Number: 16 (DW_TAG_subprogram)
    <1dd>   DW_AT_abstract_origin: <0x1b7>	
    <1e1>   DW_AT_low_pc      : 0x8048578	
    <1e5>   DW_AT_high_pc     : 0x8048588	

a=dmuir, r=jimblandy


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@520 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
jimblandy 2010-02-10 17:55:24 +00:00
parent 952f3c7b73
commit dd5067f391
5 changed files with 267 additions and 3 deletions
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6
src/common/linux/dwarf_cu_to_module.h
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@ -130,7 +130,11 @@ class DwarfCUToModule: public dwarf2reader::RootDIEHandler {
// haven't processed yet, or that wasn't marked as a declaration,
// at TARGET.
virtual void UnknownSpecification(uint64 offset, uint64 target);
// A DW_AT_abstract_origin in the DIE at OFFSET refers to a DIE we
// haven't processed yet, or that wasn't marked as inline, at TARGET.
virtual void UnknownAbstractOrigin(uint64 offset, uint64 target);
// We were unable to find the DWARF section named SECTION_NAME.
virtual void MissingSection(const string &section_name);