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Add support for applying in-memory relocations to the .debug_line section and, in the case of ELF files, using symbol addresses when available for relocations to the .debug_info section. Also extending the llvm-rtdyld tool to add the ability to dump line number information for testing purposes.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173517 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Kaylor
2013-01-25 22:50:58 +00:00
parent c73b7f7022
commit ee7c0d2f93
13 changed files with 137 additions and 11 deletions
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18
lib/DebugInfo/DWARFContext.cpp
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@ -53,7 +53,7 @@ void DWARFContext::dump(raw_ostream &OS, DIDumpType DumpType) {
DataExtractor lineData(getLineSection(), isLittleEndian(),
savedAddressByteSize);
DWARFDebugLine::DumpingState state(OS);
DWARFDebugLine::parseStatementTable(lineData, &stmtOffset, state);
DWARFDebugLine::parseStatementTable(lineData, &lineRelocMap(), &stmtOffset, state);
}
}
}
@ -155,7 +155,7 @@ const DWARFDebugAranges *DWARFContext::getDebugAranges() {
const DWARFLineTable *
DWARFContext::getLineTableForCompileUnit(DWARFCompileUnit *cu) {
if (!Line)
Line.reset(new DWARFDebugLine());
Line.reset(new DWARFDebugLine(&lineRelocMap()));
unsigned stmtOffset =
cu->getCompileUnitDIE()->getAttributeValueAsUnsigned(cu, DW_AT_stmt_list,
@ -422,12 +422,15 @@ DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj) :
else
continue;
// TODO: For now only handle relocations for the debug_info section.
// TODO: Add support for relocations in other sections as needed.
// Record relocations for the debug_info and debug_line sections.
RelocAddrMap *Map;
if (name == "debug_info")
Map = &InfoRelocMap;
else if (name == "debug_info.dwo")
Map = &InfoDWORelocMap;
else if (name == "debug_line")
Map = &LineRelocMap;
else
continue;
@ -441,10 +444,17 @@ DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj) :
reloc_i->getAddress(Address);
uint64_t Type;
reloc_i->getType(Type);
uint64_t SymAddr = 0;
// ELF relocations may need the symbol address
if (Obj->isELF()) {
object::SymbolRef Sym;
reloc_i->getSymbol(Sym);
Sym.getAddress(SymAddr);
}
object::RelocVisitor V(Obj->getFileFormatName());
// The section address is always 0 for debug sections.
object::RelocToApply R(V.visit(Type, *reloc_i));
object::RelocToApply R(V.visit(Type, *reloc_i, 0, SymAddr));
if (V.error()) {
SmallString<32> Name;
error_code ec(reloc_i->getTypeName(Name));