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Appropriately truncate debug info range in dwarf output.

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Enable live debug variables pass.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123032 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2011-01-07 21:30:41 +00:00
parent 30a343aeed
commit 1dea232624
5 changed files with 63 additions and 24 deletions
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20
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -2257,15 +2257,6 @@ DwarfDebug::collectVariableInfoFromMMITable(const MachineFunction * MF,
}
}
/// isDbgValueInUndefinedReg - Return true if debug value, encoded by
/// DBG_VALUE instruction, is in undefined reg.
static bool isDbgValueInUndefinedReg(const MachineInstr *MI) {
assert (MI->isDebugValue() && "Invalid DBG_VALUE machine instruction!");
if (MI->getOperand(0).isReg() && !MI->getOperand(0).getReg())
return true;
return false;
}
/// isDbgValueInDefinedReg - Return true if debug value, encoded by
/// DBG_VALUE instruction, is in a defined reg.
static bool isDbgValueInDefinedReg(const MachineInstr *MI) {
@ -2290,7 +2281,7 @@ DwarfDebug::collectVariableInfo(const MachineFunction *MF,
for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
II != IE; ++II) {
const MachineInstr *MInsn = II;
if (!MInsn->isDebugValue() || isDbgValueInUndefinedReg(MInsn))
if (!MInsn->isDebugValue())
continue;
DbgValues.push_back(MInsn);
}
@ -2312,19 +2303,18 @@ DwarfDebug::collectVariableInfo(const MachineFunction *MF,
ME = DbgValues.end(); MI != ME; ++MI) {
const MDNode *Var =
(*MI)->getOperand((*MI)->getNumOperands()-1).getMetadata();
if (Var == DV && isDbgValueInDefinedReg(*MI) &&
if (Var == DV &&
!PrevMI->isIdenticalTo(*MI))
MultipleValues.push_back(*MI);
PrevMI = *MI;
}
DbgScope *Scope = findDbgScope(MInsn);
bool CurFnArg = false;
DbgScope *Scope = NULL;
if (DV.getTag() == dwarf::DW_TAG_arg_variable &&
DISubprogram(DV.getContext()).describes(MF->getFunction()))
CurFnArg = true;
if (!Scope && CurFnArg)
Scope = CurrentFnDbgScope;
else
Scope = findDbgScope(MInsn);
// If variable scope is not found then skip this variable.
if (!Scope)
continue;

6
lib/CodeGen/LiveDebugVariables.cpp
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@ -39,10 +39,6 @@
using namespace llvm;
static cl::opt<bool>
EnableLDV("live-debug-variables",
cl::desc("Enable the live debug variables pass"), cl::Hidden);
char LiveDebugVariables::ID = 0;
INITIALIZE_PASS_BEGIN(LiveDebugVariables, "livedebugvars",
@ -622,8 +618,6 @@ bool LDVImpl::runOnMachineFunction(MachineFunction &mf) {
}
bool LiveDebugVariables::runOnMachineFunction(MachineFunction &mf) {
if (!EnableLDV)
return false;
if (!pImpl)
pImpl = new LDVImpl(this);
return static_cast<LDVImpl*>(pImpl)->runOnMachineFunction(mf);

2
test/CodeGen/X86/2010-05-26-DotDebugLoc.ll
View File

@ -61,6 +61,6 @@ declare void @llvm.dbg.value(metadata, i64, metadata) nounwind readnone
; CHECK-NEXT: .short 1
; CHECK-NEXT: .byte 85
; CHECK-NEXT: .quad Ltmp3
; CHECK-NEXT: .quad Lfunc_end
; CHECK-NEXT: .quad Ltmp6
; CHECK-NEXT: .short 1
; CHECK-NEXT: .byte 83

3
test/CodeGen/X86/2010-05-28-Crash.ll
View File

@ -39,6 +39,5 @@ entry:
!13 = metadata !{i32 7, i32 0, metadata !14, null}
!14 = metadata !{i32 524299, metadata !8, i32 6, i32 0} ; [ DW_TAG_lexical_block ]
;CHECK: DEBUG_VALUE: bar:x <- EBX+0
;CHECK-NEXT:Ltmp
;CHECK:Ltmp8
;CHECK-NEXT: DEBUG_VALUE: foo:y <- 1+0

56
test/CodeGen/X86/dbg-value-range.ll Normal file
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@ -0,0 +1,56 @@
; RUN: llc -mtriple=x86_64-apple-darwin < %s | FileCheck %s
%struct.a = type { i32 }
define i32 @bar(%struct.a* nocapture %b) nounwind ssp {
entry:
tail call void @llvm.dbg.value(metadata !{%struct.a* %b}, i64 0, metadata !6), !dbg !13
%tmp1 = getelementptr inbounds %struct.a* %b, i64 0, i32 0, !dbg !14
%tmp2 = load i32* %tmp1, align 4, !dbg !14, !tbaa !15
tail call void @llvm.dbg.value(metadata !{i32 %tmp2}, i64 0, metadata !11), !dbg !14
%call = tail call i32 (...)* @foo(i32 %tmp2) nounwind , !dbg !18
%add = add nsw i32 %tmp2, 1, !dbg !19
ret i32 %add, !dbg !19
}
declare i32 @foo(...)
declare void @llvm.dbg.value(metadata, i64, metadata) nounwind readnone
!llvm.dbg.sp = !{!0}
!llvm.dbg.lv.bar = !{!6, !11}
!0 = metadata !{i32 589870, i32 0, metadata !1, metadata !"bar", metadata !"bar", metadata !"", metadata !1, i32 5, metadata !3, i1 false, i1 true, i32 0, i32 0, i32 0, i32 256, i1 true, i32 (%struct.a*)* @bar} ; [ DW_TAG_subprogram ]
!1 = metadata !{i32 589865, metadata !"bar.c", metadata !"/private/tmp", metadata !2} ; [ DW_TAG_file_type ]
!2 = metadata !{i32 589841, i32 0, i32 12, metadata !"bar.c", metadata !"/private/tmp", metadata !"clang version 2.9 (trunk 122997)", i1 true, i1 true, metadata !"", i32 0} ; [ DW_TAG_compile_unit ]
!3 = metadata !{i32 589845, metadata !1, metadata !"", metadata !1, i32 0, i64 0, i64 0, i32 0, i32 0, i32 0, metadata !4, i32 0, i32 0} ; [ DW_TAG_subroutine_type ]
!4 = metadata !{metadata !5}
!5 = metadata !{i32 589860, metadata !2, metadata !"int", null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
!6 = metadata !{i32 590081, metadata !0, metadata !"b", metadata !1, i32 5, metadata !7, i32 0} ; [ DW_TAG_arg_variable ]
!7 = metadata !{i32 589839, metadata !2, metadata !"", null, i32 0, i64 64, i64 64, i64 0, i32 0, metadata !8} ; [ DW_TAG_pointer_type ]
!8 = metadata !{i32 589843, metadata !2, metadata !"a", metadata !1, i32 1, i64 32, i64 32, i32 0, i32 0, i32 0, metadata !9, i32 0, i32 0} ; [ DW_TAG_structure_type ]
!9 = metadata !{metadata !10}
!10 = metadata !{i32 589837, metadata !1, metadata !"c", metadata !1, i32 2, i64 32, i64 32, i64 0, i32 0, metadata !5} ; [ DW_TAG_member ]
!11 = metadata !{i32 590080, metadata !12, metadata !"x", metadata !1, i32 6, metadata !5, i32 0} ; [ DW_TAG_auto_variable ]
!12 = metadata !{i32 589835, metadata !0, i32 5, i32 22, metadata !1, i32 0} ; [ DW_TAG_lexical_block ]
!13 = metadata !{i32 5, i32 19, metadata !0, null}
!14 = metadata !{i32 6, i32 14, metadata !12, null}
!15 = metadata !{metadata !"int", metadata !16}
!16 = metadata !{metadata !"omnipotent char", metadata !17}
!17 = metadata !{metadata !"Simple C/C++ TBAA", null}
!18 = metadata !{i32 7, i32 2, metadata !12, null}
!19 = metadata !{i32 8, i32 2, metadata !12, null}
; check that variable bar:b value range is appropriately trucated in debug info. Here Ltmp5 is end of
; location range.
;CHECK:Ltmp5
;CHECK-NEXT: DEBUG_VALUE: bar:b <- undef
;CHECK:Ldebug_loc0:
;CHECK-NEXT: .quad Ltmp
;CHECK-NEXT: .quad Ltmp5
;CHECK-NEXT: .short 1
;CHECK-NEXT: .byte 85
;CHECK-NEXT: .quad 0
;CHECK-NEXT: .quad 0