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Emit less labels for debug info and stop emitting .loc directives for DBG_VALUEs.

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The .dot directives don't need labels, that is a leftover from when we created
line number info manually.

Instructions following a DBG_VALUE can share its label since the DBG_VALUE
doesn't produce any code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128284 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-03-25 17:20:59 +00:00
parent f14d5cf33a
commit 15a3ea0628
5 changed files with 52 additions and 65 deletions
Download Patch File Download Diff File Expand all files Collapse all files

79
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@@ -2538,47 +2538,46 @@ const MCSymbol *DwarfDebug::getLabelAfterInsn(const MachineInstr *MI) {
/// beginInstruction - Process beginning of an instruction.
void DwarfDebug::beginInstruction(const MachineInstr *MI) {
if (InsnNeedsLabel.count(MI) == 0) {
LabelsBeforeInsn[MI] = PrevLabel;
return;
// Check if source location changes, but ignore DBG_VALUE locations.
if (!MI->isDebugValue()) {
DebugLoc DL = MI->getDebugLoc();
if (DL != PrevInstLoc && (!DL.isUnknown() || UnknownLocations)) {
PrevInstLoc = DL;
if (!DL.isUnknown()) {
const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
recordSourceLine(DL.getLine(), DL.getCol(), Scope);
} else
recordSourceLine(0, 0, 0);
}
}
// Check location.
DebugLoc DL = MI->getDebugLoc();
if (!DL.isUnknown()) {
const MDNode *Scope = DL.getScope(Asm->MF->getFunction()->getContext());
PrevLabel = recordSourceLine(DL.getLine(), DL.getCol(), Scope);
PrevInstLoc = DL;
LabelsBeforeInsn[MI] = PrevLabel;
// Insert labels where requested.
if (!InsnNeedsLabel.count(MI))
return;
}
// If location is unknown then use temp label for this DBG_VALUE
// instruction.
if (MI->isDebugValue()) {
if (!PrevLabel) {
PrevLabel = MMI->getContext().CreateTempSymbol();
Asm->OutStreamer.EmitLabel(PrevLabel);
LabelsBeforeInsn[MI] = PrevLabel;
return;
}
if (UnknownLocations) {
PrevLabel = recordSourceLine(0, 0, 0);
LabelsBeforeInsn[MI] = PrevLabel;
return;
}
assert (0 && "Instruction is not processed!");
LabelsBeforeInsn[MI] = PrevLabel;
}
/// endInstruction - Process end of an instruction.
void DwarfDebug::endInstruction(const MachineInstr *MI) {
if (InsnsNeedsLabelAfter.count(MI) != 0) {
// Emit a label if this instruction ends a scope.
MCSymbol *Label = MMI->getContext().CreateTempSymbol();
Asm->OutStreamer.EmitLabel(Label);
LabelsAfterInsn[MI] = Label;
// Don't create a new label after DBG_VALUE instructions.
// They don't generate code.
if (!MI->isDebugValue())
PrevLabel = 0;
if (!InsnsNeedsLabelAfter.count(MI))
return;
// We need a label after this instruction.
if (!PrevLabel) {
PrevLabel = MMI->getContext().CreateTempSymbol();
Asm->OutStreamer.EmitLabel(PrevLabel);
}
LabelsAfterInsn[MI] = PrevLabel;
}
/// getOrCreateDbgScope - Create DbgScope for the scope.
@@ -2838,6 +2837,7 @@ void DwarfDebug::identifyScopeMarkers() {
RE = Ranges.end(); RI != RE; ++RI) {
assert(RI->first && "DbgRange does not have first instruction!");
assert(RI->second && "DbgRange does not have second instruction!");
InsnNeedsLabel.insert(RI->first);
InsnsNeedsLabelAfter.insert(RI->second);
}
}
@@ -2927,7 +2927,6 @@ void DwarfDebug::beginFunction(const MachineFunction *MF) {
/// LiveUserVar - Map physreg numbers to the MDNode they contain.
std::vector<const MDNode*> LiveUserVar(TRI->getNumRegs());
DebugLoc PrevLoc;
for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
I != E; ++I)
for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
@@ -2957,15 +2956,6 @@ void DwarfDebug::beginFunction(const MachineFunction *MF) {
else if (!ProcessedArgs.insert(DV))
InsnNeedsLabel.insert(MI);
} else {
// If location is unknown then instruction needs a location only if
// UnknownLocations flag is set.
if (DL.isUnknown()) {
if (UnknownLocations && !PrevLoc.isUnknown())
InsnNeedsLabel.insert(MI);
} else if (DL != PrevLoc)
// Otherwise, instruction needs a location only if it is new location.
InsnNeedsLabel.insert(MI);
// Check if the instruction clobbers any registers with debug vars.
for (MachineInstr::const_mop_iterator MOI = MI->operands_begin(),
MOE = MI->operands_end(); MOI != MOE; ++MOI) {
@@ -2992,11 +2982,9 @@ void DwarfDebug::beginFunction(const MachineFunction *MF) {
}
}
}
if (!DL.isUnknown() || UnknownLocations)
PrevLoc = DL;
}
PrevInstLoc = DebugLoc();
PrevLabel = FunctionBeginSym;
}
@@ -3112,8 +3100,7 @@ DbgScope *DwarfDebug::findDbgScope(const MachineInstr *MInsn) {
/// recordSourceLine - Register a source line with debug info. Returns the
/// unique label that was emitted and which provides correspondence to
/// the source line list.
MCSymbol *DwarfDebug::recordSourceLine(unsigned Line, unsigned Col,
const MDNode *S) {
void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S){
StringRef Fn;
StringRef Dir;
unsigned Src = 1;
@@ -3144,10 +3131,6 @@ MCSymbol *DwarfDebug::recordSourceLine(unsigned Line, unsigned Col,
Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, DWARF2_FLAG_IS_STMT,
0, 0);
MCSymbol *Label = MMI->getContext().CreateTempSymbol();
Asm->OutStreamer.EmitLabel(Label);
return Label;
}
//===----------------------------------------------------------------------===//