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Fix PR32298 by adding an early exit to getFrameIndexExprs(). 

Also add an assertion for the case that there are multiple FI
expressions with a DW_OP_LLVM_fragment; which should violate internal
constraints in DbgVariable.

llvm-svn: 298518
This commit is contained in:
Adrian Prantl 2017-03-22 16:50:16 +00:00
parent 17e228f309
commit 5503077cde
2 changed files with 46 additions and 0 deletions
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6
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -199,6 +199,12 @@ const DIType *DbgVariable::getType() const {
}
ArrayRef<DbgVariable::FrameIndexExpr> DbgVariable::getFrameIndexExprs() const {
if (FrameIndexExprs.size() == 1)
return FrameIndexExprs;
assert(all_of(FrameIndexExprs,
[](const FrameIndexExpr &A) { return A.Expr->isFragment(); }) &&
"multiple FI expressions without DW_OP_LLVM_fragment");
std::sort(FrameIndexExprs.begin(), FrameIndexExprs.end(),
[](const FrameIndexExpr &A, const FrameIndexExpr &B) -> bool {
return A.Expr->getFragmentInfo()->OffsetInBits <

40
llvm/test/DebugInfo/X86/single-fi.ll Normal file
View File

@ -0,0 +1,40 @@
; RUN: %llc_dwarf -march=x86-64 -o - %s -filetype=obj \
; RUN: | llvm-dwarfdump -debug-dump=info - | FileCheck %s
; A single FI location. This used to trigger an assertion in debug libstdc++.
; CHECK: DW_TAG_formal_parameter
; fbreg -8
; CHECK-NEXT: DW_AT_location {{.*}} (<0x2> 91 78 )
; CHECK-NEXT: DW_AT_name {{.*}} "dipsy"
define void @tinkywinky(i8* %dipsy) !dbg !6 {
entry:
%dipsy.addr = alloca i8*
store i8* %dipsy, i8** %dipsy.addr
call void @llvm.dbg.declare(metadata i8** %dipsy.addr, metadata !12, metadata
!13), !dbg !14
ret void, !dbg !15
}
declare void @llvm.dbg.declare(metadata, metadata, metadata)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}
!llvm.ident = !{!5}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 5.0.0 (trunk 297917) (llvm/trunk 297929)", isOptimized: false,
runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "teletubbies.c", directory: "/home/davide/work/llvm/build-clang/bin")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{!"clang version 5.0.0 (trunk 297917) (llvm/trunk 297929)"}
!6 = distinct !DISubprogram(name: "tinkywinky", scope: !1, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, scopeLine: 1, flags:
DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
!7 = !DISubroutineType(types: !8)
!8 = !{null, !9}
!9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64)
!10 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !11)
!11 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
!12 = !DILocalVariable(name: "dipsy", arg: 1, scope: !6, file: !1, line: 1, type: !9)
!13 = !DIExpression()
!14 = !DILocation(line: 1, column: 29, scope: !6)
!15 = !DILocation(line: 1, column: 37, scope: !6)