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This patch extends the libLLVMDebugInfo which contains a minimalistic DWARF parser:

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1) DIContext is now able to return function name for a given instruction address (besides file/line info).
2) llvm-dwarfdump accepts flag --functions that prints the function name (if address is specified by --address flag).
3) test case that checks the basic functionality of llvm-dwarfdump added

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159512 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov
2012-07-02 05:54:45 +00:00
parent 9c3d5a70f4
commit 3e25c4a1e3
12 changed files with 174 additions and 31 deletions
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48
lib/DebugInfo/DWARFDebugInfoEntry.cpp
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@ -440,3 +440,51 @@ DWARFDebugInfoEntryMinimal::buildAddressRangeTable(const DWARFCompileUnit *cu,
}
}
}
bool
DWARFDebugInfoEntryMinimal::addressRangeContainsAddress(
const DWARFCompileUnit *cu, const uint64_t address) const {
if (!isNULL() && getTag() == DW_TAG_subprogram) {
uint64_t hi_pc = -1ULL;
uint64_t lo_pc = getAttributeValueAsUnsigned(cu, DW_AT_low_pc, -1ULL);
if (lo_pc != -1ULL)
hi_pc = getAttributeValueAsUnsigned(cu, DW_AT_high_pc, -1ULL);
if (hi_pc != -1ULL) {
return (lo_pc <= address && address < hi_pc);
}
}
return false;
}
static inline const char*
getSubprogramNameFromDie(const DWARFCompileUnit *cu,
const DWARFDebugInfoEntryMinimal *die) {
const char *result = 0;
if (!die->isNULL() && die->getTag() == DW_TAG_subprogram) {
// Try to get mangled name if possible.
result = die->getAttributeValueAsString(cu, DW_AT_MIPS_linkage_name, 0);
if (result == 0)
result = die->getAttributeValueAsString(cu, DW_AT_linkage_name, 0);
if (result == 0)
result = die->getAttributeValueAsString(cu, DW_AT_name, 0);
}
return result;
}
const char*
DWARFDebugInfoEntryMinimal::getSubprogramName(
const DWARFCompileUnit *cu) const {
if (isNULL() || getTag() != DW_TAG_subprogram)
return 0;
const char *name = getSubprogramNameFromDie(cu, this);
if (name == 0) {
// Try to get name from specification DIE.
uint32_t ref = getAttributeValueAsReference(cu, DW_AT_specification, -1U);
if (ref != -1U) {
DWARFDebugInfoEntryMinimal spec_die;
if (spec_die.extract(cu, &ref))
name = getSubprogramNameFromDie(cu, &spec_die);
}
}
return name;
}