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Initial support for DWARF CFI parsing and dumping in LLVM

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174463 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Bendersky
2013-02-05 23:30:58 +00:00
parent 5e215f9bfd
commit 60bdc5b16e
7 changed files with 294 additions and 3 deletions
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30
lib/DebugInfo/DWARFContext.cpp
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@ -31,6 +31,11 @@ void DWARFContext::dump(raw_ostream &OS, DIDumpType DumpType) {
getCompileUnitAtIndex(i)->dump(OS);
}
if (DumpType == DIDT_All || DumpType == DIDT_Frames) {
OS << "\n.debug_frame contents:\n";
getDebugFrame()->dump(OS);
}
uint32_t offset = 0;
if (DumpType == DIDT_All || DumpType == DIDT_Aranges) {
OS << "\n.debug_aranges contents:\n";
@ -152,6 +157,26 @@ const DWARFDebugAranges *DWARFContext::getDebugAranges() {
return Aranges.get();
}
const DWARFDebugFrame *DWARFContext::getDebugFrame() {
if (DebugFrame)
return DebugFrame.get();
// There's a "bug" in the DWARFv3 standard with respect to the target address
// size within debug frame sections. While DWARF is supposed to be independent
// of its container, FDEs have fields with size being "target address size",
// which isn't specified in DWARF in general. It's only specified for CUs, but
// .eh_frame can appear without a .debug_info section. Follow the example of
// other tools (libdwarf) and extract this from the container (ObjectFile
// provides this information). This problem is fixed in DWARFv4
// See this dwarf-discuss discussion for more details:
// http://lists.dwarfstd.org/htdig.cgi/dwarf-discuss-dwarfstd.org/2011-December/001173.html
DataExtractor debugFrameData(getDebugFrameSection(), isLittleEndian(),
getAddressSize());
DebugFrame.reset(new DWARFDebugFrame());
DebugFrame->parse(debugFrameData);
return DebugFrame.get();
}
const DWARFLineTable *
DWARFContext::getLineTableForCompileUnit(DWARFCompileUnit *cu) {
if (!Line)
@ -440,7 +465,8 @@ DIInliningInfo DWARFContext::getInliningInfoForAddress(uint64_t Address,
}
DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj) :
IsLittleEndian(Obj->isLittleEndian()) {
IsLittleEndian(Obj->isLittleEndian()),
AddressSize(Obj->getBytesInAddress()) {
error_code ec;
for (object::section_iterator i = Obj->begin_sections(),
e = Obj->end_sections();
@ -459,6 +485,8 @@ DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj) :
LineSection = data;
else if (name == "debug_aranges")
ARangeSection = data;
else if (name == "debug_frame")
DebugFrameSection = data;
else if (name == "debug_str")
StringSection = data;
else if (name == "debug_ranges") {