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DebugInfo: Do not rely on the compilation dir (index 0) for files in line tables shared between compilation units

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When emitting assembly there's no support for emitting separate line
tables for each compilation unit - so LLVM emits .loc directives
producing a single line table.

Line tables have an implicit directory (index 0) equal to the
compilation directory (DW_AT_comp_dir) of the compilation unit that
references them.

If multiple compilation units (with possibly disparate compilation
directories) reference the same line table, we must avoid relying on
this ambiguous directory.

Achieve this my simply not setting the compilation directory on the line
table when we're in this situation (multiple units while emitting
assembly).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204094 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie 2014-03-18 00:11:48 +00:00
parent 1881227389
commit 2a12c4e5bd
3 changed files with 17 additions and 6 deletions
lib/CodeGen/AsmPrinter
DwarfDebug.cppDwarfDebug.h
test/DebugInfo
lto-comp-dir.ll

16
lib/CodeGen/AsmPrinter/DwarfDebug.cpp

@ -674,7 +674,8 @@ void DwarfDebug::addGnuPubAttributes(DwarfUnit *U, DIE *D) const {
// Create new DwarfCompileUnit for the given metadata node with tag
// DW_TAG_compile_unit.
DwarfCompileUnit *DwarfDebug::constructDwarfCompileUnit(DICompileUnit DIUnit) {
DwarfCompileUnit *DwarfDebug::constructDwarfCompileUnit(DICompileUnit DIUnit,
bool Singular) {
StringRef FN = DIUnit.getFilename();
CompilationDir = DIUnit.getDirectory();
@ -682,8 +683,9 @@ DwarfCompileUnit *DwarfDebug::constructDwarfCompileUnit(DICompileUnit DIUnit) {
DwarfCompileUnit *NewCU = new DwarfCompileUnit(
InfoHolder.getUnits().size(), Die, DIUnit, Asm, this, &InfoHolder);
InfoHolder.addUnit(NewCU);
Asm->OutStreamer.getContext().setMCLineTableCompilationDir(
NewCU->getUniqueID(), CompilationDir);
if (!Asm->OutStreamer.hasRawTextSupport() || Singular)
Asm->OutStreamer.getContext().setMCLineTableCompilationDir(
NewCU->getUniqueID(), CompilationDir);
NewCU->addString(Die, dwarf::DW_AT_producer, DIUnit.getProducer());
NewCU->addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
@ -814,9 +816,13 @@ void DwarfDebug::beginModule() {
// Emit initial sections so we can reference labels later.
emitSectionLabels();
for (MDNode *N : CU_Nodes->operands()) {
auto Operands = CU_Nodes->operands();
bool SingleCU = std::next(Operands.begin()) == Operands.end();
for (MDNode *N : Operands) {
DICompileUnit CUNode(N);
DwarfCompileUnit *CU = constructDwarfCompileUnit(CUNode);
DwarfCompileUnit *CU = constructDwarfCompileUnit(CUNode, SingleCU);
DIArray ImportedEntities = CUNode.getImportedEntities();
for (unsigned i = 0, e = ImportedEntities.getNumElements(); i != e; ++i)
ScopesWithImportedEntities.push_back(std::make_pair(

3
lib/CodeGen/AsmPrinter/DwarfDebug.h

@ -630,7 +630,8 @@ class DwarfDebug : public AsmPrinterHandler {
/// \brief Create new DwarfCompileUnit for the given metadata node with tag
/// DW_TAG_compile_unit.
DwarfCompileUnit *constructDwarfCompileUnit(DICompileUnit DIUnit);
DwarfCompileUnit *constructDwarfCompileUnit(DICompileUnit DIUnit,
bool Singular);
/// \brief Construct subprogram DIE.
void constructSubprogramDIE(DwarfCompileUnit *TheCU, const MDNode *N);

4
test/DebugInfo/lto-comp-dir.ll

@ -1,4 +1,5 @@
; RUN: %llc_dwarf < %s -filetype=obj | llvm-dwarfdump -debug-dump=line - | FileCheck %s
; RUN: %llc_dwarf < %s -filetype=asm | FileCheck --check-prefix=ASM %s
; CHECK: .debug_line contents:
; CHECK-NEXT: Line table prologue:
@ -11,6 +12,9 @@
; CHECK: file_names[ 1] 0 {{.*}} b.cpp
; CHECK-NOT: file_names
; ASM: .file 1 "/tmp/dbginfo/a/a.cpp"
; ASM: .file 2 "/tmp/dbginfo/b/b.cpp"
; Generated from the following source compiled to bitcode from within their
; respective directories (with debug info) and linked together with llvm-link