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Emit debug info for MachineInstrs with unknown debug locations, instead

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of just letting them inherit the debug locations of adjacent instructions.

Debug info should aim to be either accurate or absent.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103135 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-05-05 23:41:32 +00:00
parent b7d0688195
commit 1cc0d62855
1 changed files with 34 additions and 19 deletions
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53
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -2150,8 +2150,20 @@ void DwarfDebug::collectVariableInfo() {
void DwarfDebug::beginScope(const MachineInstr *MI) {
// Check location.
DebugLoc DL = MI->getDebugLoc();
if (DL.isUnknown())
if (DL.isUnknown()) {
// This instruction has no debug location. If the preceding instruction
// did, emit debug location information to indicate that the debug
// location is now unknown.
MCSymbol *Label = NULL;
if (DL == PrevInstLoc)
Label = PrevLabel;
else {
Label = recordSourceLine(DL.getLine(), DL.getCol(), 0);
PrevInstLoc = DL;
PrevLabel = Label;
}
return;
}
MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
@ -2564,23 +2576,28 @@ MCSymbol *DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, MDNode *S) {
StringRef Dir;
StringRef Fn;
DIDescriptor Scope(S);
if (Scope.isCompileUnit()) {
DICompileUnit CU(S);
Dir = CU.getDirectory();
Fn = CU.getFilename();
} else if (Scope.isSubprogram()) {
DISubprogram SP(S);
Dir = SP.getDirectory();
Fn = SP.getFilename();
} else if (Scope.isLexicalBlock()) {
DILexicalBlock DB(S);
Dir = DB.getDirectory();
Fn = DB.getFilename();
} else
assert(0 && "Unexpected scope info");
unsigned Src = 1;
if (S) {
DIDescriptor Scope(S);
if (Scope.isCompileUnit()) {
DICompileUnit CU(S);
Dir = CU.getDirectory();
Fn = CU.getFilename();
} else if (Scope.isSubprogram()) {
DISubprogram SP(S);
Dir = SP.getDirectory();
Fn = SP.getFilename();
} else if (Scope.isLexicalBlock()) {
DILexicalBlock DB(S);
Dir = DB.getDirectory();
Fn = DB.getFilename();
} else
assert(0 && "Unexpected scope info");
Src = GetOrCreateSourceID(Dir, Fn);
}
unsigned Src = GetOrCreateSourceID(Dir, Fn);
MCSymbol *Label = MMI->getContext().CreateTempSymbol();
Lines.push_back(SrcLineInfo(Line, Col, Src, Label));
@ -2967,8 +2984,6 @@ void DwarfDebug::emitDebugLines() {
MCSymbol *Label = LineInfo.getLabel();
if (!Label->isDefined()) continue; // Not emitted, in dead code.
if (LineInfo.getLine() == 0) continue;
if (Asm->isVerbose()) {
std::pair<unsigned, unsigned> SrcID =
getSourceDirectoryAndFileIds(LineInfo.getSourceID());