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Remove wild .debug_aranges entries generated from unimportant labels

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r191052 added emitting .debug_aranges to Clang, but this
functionality is broken: it uses all MC labels added in DWARF Asm
printer, including the labels for build relocations between
different DWARF sections, like .Lsection_line or .Ldebug_loc0.

As a result, if any DIE .debug_info would contain "DW_AT_location=0x123"
attribute, .debug_aranges would also contain a range starting from 0x123,
breaking tools that rely on this section.

This patch fixes this by using only MC labels that corresponds to the
addresses in the user program.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191884 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov
2013-10-03 08:54:43 +00:00
parent 198f1b340a
commit 9d08d69fd4
4 changed files with 98 additions and 22 deletions
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9
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -1110,8 +1110,8 @@ void DwarfDebug::finalizeModuleInfo() {
void DwarfDebug::endSections() {
// Filter labels by section.
for (size_t n = 0; n < Labels.size(); n++) {
const SymbolCU &SCU = Labels[n];
for (size_t n = 0; n < ArangeLabels.size(); n++) {
const SymbolCU &SCU = ArangeLabels[n];
if (SCU.Sym->isInSection()) {
// Make a note of this symbol and it's section.
const MCSection *Section = &SCU.Sym->getSection();
@ -1138,10 +1138,7 @@ void DwarfDebug::endSections() {
}
// Insert a final terminator.
SymbolCU Entry;
Entry.CU = NULL;
Entry.Sym = Sym;
SectionMap[Section].push_back(Entry);
SectionMap[Section].push_back(SymbolCU(NULL, Sym));
}
}