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Debug Info: store the files and directories for each compile unit.

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We now emit a line table for each compile unit. To reduce the prologue size
of each line table, the files and directories used by each compile unit are
stored in std::map<unsigned, std::vector< > > instead of std::vector< >.

The prologue for a lto'ed image can be as big as 93K. Duplicating 93K for each
compile unit causes a huge increase of debug info. With this patch, each
prologue will only emit the files required by the compile unit.

rdar://problem/13342023


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176605 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Manman Ren
2013-03-07 01:42:00 +00:00
parent 55d8f6d490
commit 3de61b4c01
12 changed files with 87 additions and 46 deletions
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lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+25 -10
View File
@@ -528,7 +528,8 @@ DIE *DwarfDebug::constructInlinedScopeDIE(CompileUnit *TheCU,
DILocation DL(Scope->getInlinedAt());
TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_file, 0,
getOrCreateSourceID(DL.getFilename(), DL.getDirectory()));
getOrCreateSourceID(DL.getFilename(), DL.getDirectory(),
TheCU->getUniqueID()));
TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_line, 0, DL.getLineNumber());
// Add name to the name table, we do this here because we're guaranteed
@@ -617,19 +618,28 @@ DIE *DwarfDebug::constructScopeDIE(CompileUnit *TheCU, LexicalScope *Scope) {
// SourceIds map. This can update DirectoryNames and SourceFileNames maps
// as well.
unsigned DwarfDebug::getOrCreateSourceID(StringRef FileName,
StringRef DirName) {
StringRef DirName, unsigned CUID) {
// If we use .loc in assembly, we can't separate .file entries according to
// compile units. Thus all files will belong to the default compile unit.
if (Asm->TM.hasMCUseLoc() &&
Asm->OutStreamer.getKind() == MCStreamer::SK_AsmStreamer)
CUID = 0;
// If FE did not provide a file name, then assume stdin.
if (FileName.empty())
return getOrCreateSourceID("<stdin>", StringRef());
return getOrCreateSourceID("<stdin>", StringRef(), CUID);
// TODO: this might not belong here. See if we can factor this better.
if (DirName == CompilationDir)
DirName = "";
unsigned SrcId = SourceIdMap.size()+1;
// FileIDCUMap stores the current ID for the given compile unit.
unsigned SrcId = FileIDCUMap[CUID] + 1;
// We look up the file/dir pair by concatenating them with a zero byte.
// We look up the CUID/file/dir by concatenating them with a zero byte.
SmallString<128> NamePair;
NamePair += CUID;
NamePair += '\0';
NamePair += DirName;
NamePair += '\0'; // Zero bytes are not allowed in paths.
NamePair += FileName;
@@ -638,8 +648,9 @@ unsigned DwarfDebug::getOrCreateSourceID(StringRef FileName,
if (Ent.getValue() != SrcId)
return Ent.getValue();
FileIDCUMap[CUID] = SrcId;
// Print out a .file directive to specify files for .loc directives.
Asm->OutStreamer.EmitDwarfFileDirective(SrcId, DirName, FileName);
Asm->OutStreamer.EmitDwarfFileDirective(SrcId, DirName, FileName, CUID);
return SrcId;
}
@@ -650,14 +661,17 @@ CompileUnit *DwarfDebug::constructCompileUnit(const MDNode *N) {
DICompileUnit DIUnit(N);
StringRef FN = DIUnit.getFilename();
CompilationDir = DIUnit.getDirectory();
// Call this to emit a .file directive if it wasn't emitted for the source
// file this CU comes from yet.
getOrCreateSourceID(FN, CompilationDir);
DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
CompileUnit *NewCU = new CompileUnit(GlobalCUIndexCount++,
DIUnit.getLanguage(), Die, Asm,
this, &InfoHolder);
FileIDCUMap[NewCU->getUniqueID()] = 0;
// Call this to emit a .file directive if it wasn't emitted for the source
// file this CU comes from yet.
getOrCreateSourceID(FN, CompilationDir, NewCU->getUniqueID());
NewCU->addString(Die, dwarf::DW_AT_producer, DIUnit.getProducer());
NewCU->addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
DIUnit.getLanguage());
@@ -1707,7 +1721,8 @@ void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
} else
llvm_unreachable("Unexpected scope info");
Src = getOrCreateSourceID(Fn, Dir);
Src = getOrCreateSourceID(Fn, Dir,
Asm->OutStreamer.getContext().getDwarfCompileUnitID());
}
Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags, 0, 0, Fn);
}