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[Debugify] Allow unsigned values narrower than their variables

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Suppress the diagnostic for mis-sized dbg.values when a value operand is
narrower than the unsigned variable it describes. Assume that a debugger
would implicitly zero-extend these values.

llvm-svn: 336452
This commit is contained in:
Vedant Kumar 2018-07-06 17:32:40 +00:00
parent 7e4e253821
commit c0eb33d15f
2 changed files with 19 additions and 5 deletions
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13
test/DebugInfo/debugify-bogus-dbg-value.ll
View File

@ -16,6 +16,10 @@ define <2 x i64> @test-fun(<2 x i64> %A) !dbg !6 {
; CHECK-NOT: ERROR: dbg.value operand has size 512, but its variable has size 256
call void @llvm.dbg.value(metadata i512 0, metadata !12, metadata !DIExpression()), !dbg !15
; Assume the debugger implicitly zero-extends unsigned values.
; CHECK-NOT: ERROR: dbg.value operand has size 4, but its variable has size 32
call void @llvm.dbg.value(metadata i8 0, metadata !17, metadata !DIExpression()), !dbg !15
ret <2 x i64> %and, !dbg !16
}
; CHECK: CheckModuleDebugify: FAIL
@ -33,20 +37,23 @@ attributes #0 = { nounwind readnone speculatable }
!1 = !DIFile(filename: "/Users/vsk/src/llvm.org-master/llvm/test/DebugInfo/debugify-bogus-dbg-value.ll", directory: "/")
!2 = !{}
!3 = !{i32 4}
!4 = !{i32 3}
!4 = !{i32 4}
!5 = !{i32 2, !"Debug Info Version", i32 3}
!6 = distinct !DISubprogram(name: "test-fun", linkageName: "test-fun", scope: null, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, retainedNodes: !8)
!7 = !DISubroutineType(types: !2)
!8 = !{!9, !11, !12}
!9 = !DILocalVariable(name: "1", scope: !6, file: !1, line: 1, type: !10)
!10 = !DIBasicType(name: "ty64", size: 64, encoding: DW_ATE_unsigned)
!10 = !DIBasicType(name: "ty64", size: 64, encoding: DW_ATE_signed)
!11 = !DILocalVariable(name: "2", scope: !6, file: !1, line: 2, type: !10)
!12 = !DILocalVariable(name: "3", scope: !6, file: !1, line: 3, type: !13)
; Set the size here to an incorrect value to check that the size diagnostic
; triggers.
!13 = !DIBasicType(name: "ty128", size: 256, encoding: DW_ATE_unsigned)
!13 = !DIBasicType(name: "ty128", size: 256, encoding: DW_ATE_signed)
!14 = !DILocation(line: 2, column: 1, scope: !6)
!15 = !DILocation(line: 3, column: 1, scope: !6)
!16 = !DILocation(line: 4, column: 1, scope: !6)
!17 = !DILocalVariable(name: "4", scope: !6, file: !1, line: 3, type: !18)
!18 = !DIBasicType(name: "ty32_unsigned", size: 32, encoding: DW_ATE_unsigned)

11
tools/opt/Debugify.cpp
View File

@ -188,8 +188,15 @@ bool diagnoseMisSizedDbgValue(Module &M, DbgValueInst *DVI) {
if (!ValueOperandSize || !DbgVarSize)
return false;
bool HasBadSize = Ty->isIntegerTy() ? (ValueOperandSize < *DbgVarSize)
: (ValueOperandSize != *DbgVarSize);
bool HasBadSize = false;
if (Ty->isIntegerTy()) {
auto Signedness = DVI->getVariable()->getSignedness();
if (Signedness && *Signedness == DIBasicType::Signedness::Signed)
HasBadSize = ValueOperandSize < *DbgVarSize;
} else {
HasBadSize = ValueOperandSize != *DbgVarSize;
}
if (HasBadSize) {
dbg() << "ERROR: dbg.value operand has size " << ValueOperandSize
<< ", but its variable has size " << *DbgVarSize << ": ";