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[IR] Make TypeFinder aware of DIArgList values

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TypeFinder did not find types under DIArgList. This resulted in a case
of invalid IR after GlobalOpt removed a global that was the only
non-DIArgList use of a struct type.

  error: use of undefined type named 'struct.S'
    call void @llvm.dbg.value(
      metadata !DIArgList([1 x %struct.S]* undef, i64 %idxprom),
      metadata !24, metadata !DIExpression([...]))

Reviewed By: jmorse

Differential Revision: https://reviews.llvm.org/D103306
This commit is contained in:
David Stenberg 2021-05-28 16:37:47 +02:00
parent c5daefddfe
commit 182c5d61c0
2 changed files with 68 additions and 0 deletions
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9
lib/IR/TypeFinder.cpp
View File

@ -14,6 +14,7 @@
#include "llvm/ADT/SmallVector.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instruction.h"
@ -152,6 +153,14 @@ void TypeFinder::incorporateMDNode(const MDNode *V) {
if (!VisitedMetadata.insert(V).second)
return;
// The arguments in DIArgList are not exposed as operands, so handle such
// nodes specifically here.
if (const auto *AL = dyn_cast<DIArgList>(V)) {
for (auto *Arg : AL->getArgs())
incorporateValue(Arg->getValue());
return;
}
// Look in operands for types.
for (Metadata *Op : V->operands()) {
if (!Op)

59
test/Transforms/GlobalOpt/deadglobal-diarglist-use.ll Normal file
View File

@ -0,0 +1,59 @@
; RUN: opt < %s -globalopt -S | llvm-as | llvm-dis | FileCheck %s
; The %struct.S type would not get emitted after @s was removed, resulting in
; llvm-as failing to parse the dbg.value intrinsic using that type. The
; FileCheck checks are just added to verify that the desired transformation is
; done.
; CHECK-NOT: @s
; CHECK: %struct.S = type { i32 }
; CHECK-NOT: @s
; CHECK: call void @llvm.dbg.value(metadata !DIArgList([1 x %struct.S]* undef
%struct.S = type { i32 }
@s = internal global [1 x %struct.S] zeroinitializer, align 4, !dbg !0
@idx = dso_local global i32 0, align 4, !dbg !6
define dso_local void @fn() !dbg !20 {
entry:
%0 = load i32, i32* @idx, align 4, !dbg !26
%idxprom = sext i32 %0 to i64, !dbg !26
call void @llvm.dbg.value(metadata !DIArgList([1 x %struct.S]* @s, i64 %idxprom), metadata !24, metadata !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 1, DW_OP_constu, 4, DW_OP_mul, DW_OP_plus, DW_OP_stack_value)), !dbg !26
ret void, !dbg !26
}
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!15, !16, !17, !18}
!llvm.ident = !{!19}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "s", scope: !2, file: !3, line: 1, type: !9, isLocal: true, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 13.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
!3 = !DIFile(filename: "foo.c", directory: "/")
!4 = !{}
!5 = !{!0, !6}
!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
!7 = distinct !DIGlobalVariable(name: "idx", scope: !2, file: !3, line: 2, type: !8, isLocal: false, isDefinition: true)
!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!9 = !DICompositeType(tag: DW_TAG_array_type, baseType: !10, size: 32, elements: !13)
!10 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "S", file: !3, line: 1, size: 32, elements: !11)
!11 = !{!12}
!12 = !DIDerivedType(tag: DW_TAG_member, name: "data", scope: !10, file: !3, line: 1, baseType: !8, size: 32)
!13 = !{!14}
!14 = !DISubrange(count: 1)
!15 = !{i32 7, !"Dwarf Version", i32 4}
!16 = !{i32 2, !"Debug Info Version", i32 3}
!17 = !{i32 1, !"wchar_size", i32 4}
!18 = !{i32 7, !"uwtable", i32 1}
!19 = !{!"clang version 13.0.0"}
!20 = distinct !DISubprogram(name: "fn", scope: !3, file: !3, line: 4, type: !21, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !23)
!21 = !DISubroutineType(types: !22)
!22 = !{null}
!23 = !{!24}
!24 = !DILocalVariable(name: "local", scope: !20, file: !3, line: 5, type: !25)
!25 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64)
!26 = !DILocation(line: 5, scope: !20)