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llvm-mirror/test/Transforms/InstCombine/debuginfo-dce.ll
Reid Kleckner 67886a34d2 Parse and print DIExpressions inline to ease IR and MIR testing 
Summary:
Most DIExpressions are empty or very simple. When they are complex, they
tend to be unique, so checking them inline is reasonable.

This also avoids the need for CodeGen passes to append to the
llvm.dbg.mir named md node.

See also PR22780, for making DIExpression not be an MDNode.

Reviewers: aprantl, dexonsmith, dblaikie

Subscribers: qcolombet, javed.absar, eraman, hiraditya, llvm-commits

Differential Revision: https://reviews.llvm.org/D37075

llvm-svn: 311594
2017-08-23 20:31:27 +00:00

140 lines
7.2 KiB
LLVM
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; RUN: opt -instcombine %s -S -o - | FileCheck %s
; Verify that the eliminated instructions (bitcast, gep, load) are salvaged into
; a DIExpression.
;
; Originally created from the following C source and then heavily isolated/reduced.
;
; struct entry {
; struct entry *next;
; };
; void scan(struct entry *queue, struct entry *end)
; {
; struct entry *entry;
; for (entry = (struct entry *)((char *)(queue->next) - 8);
; &entry->next == end;
; entry = (struct entry *)((char *)(entry->next) - 8)) {
; }
; }
; ModuleID = '<stdin>'
source_filename = "test.c"
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.12.0"
%struct.entry = type { %struct.entry* }
define void @salvage_load(%struct.entry** %queue) local_unnamed_addr #0 !dbg !14 {
entry:
%im_not_dead = alloca %struct.entry*
%0 = load %struct.entry*, %struct.entry** %queue, align 8, !dbg !19
%1 = load %struct.entry*, %struct.entry** %queue, align 8, !dbg !19
call void @llvm.dbg.value(metadata %struct.entry* %1, metadata !18, metadata !20), !dbg !19
; CHECK: define void @salvage_load
; CHECK-NEXT: entry:
; CHECK-NEXT: call void @llvm.dbg.value(metadata %struct.entry** %queue,
; CHECK-SAME: metadata !DIExpression(DW_OP_deref, DW_OP_plus_uconst, 0))
store %struct.entry* %1, %struct.entry** %im_not_dead, align 8
ret void, !dbg !21
}
define void @salvage_bitcast(%struct.entry* %queue) local_unnamed_addr #0 !dbg !22 {
entry:
%im_not_dead = alloca i8*
%0 = bitcast %struct.entry* %queue to i8*, !dbg !23
%1 = bitcast %struct.entry* %queue to i8*, !dbg !23
call void @llvm.dbg.value(metadata i8* %1, metadata !24, metadata !20), !dbg !23
; CHECK: define void @salvage_bitcast
; CHECK-NEXT: entry:
; CHECK-NEXT: call void @llvm.dbg.value(metadata %struct.entry* %queue,
; CHECK-SAME: metadata !DIExpression(DW_OP_plus_uconst, 0))
store i8* %1, i8** %im_not_dead, align 8
ret void, !dbg !23
}
define void @salvage_gep0(%struct.entry* %queue, %struct.entry* %end) local_unnamed_addr #0 !dbg !25 {
entry:
%im_not_dead = alloca %struct.entry**
%0 = getelementptr inbounds %struct.entry, %struct.entry* %queue, i32 -1, i32 0, !dbg !26
%1 = getelementptr inbounds %struct.entry, %struct.entry* %queue, i32 -1, i32 0, !dbg !26
call void @llvm.dbg.value(metadata %struct.entry** %1, metadata !27, metadata !20), !dbg !26
; CHECK: define void @salvage_gep0
; CHECK-NEXT: entry:
; CHECK-NEXT: call void @llvm.dbg.value(metadata %struct.entry* %queue,
; CHECK-SAME: metadata !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_plus_uconst, 0, DW_OP_stack_value))
store %struct.entry** %1, %struct.entry*** %im_not_dead, align 8
ret void, !dbg !26
}
define void @salvage_gep1(%struct.entry* %queue, %struct.entry* %end) local_unnamed_addr #0 !dbg !28 {
entry:
%im_not_dead = alloca %struct.entry**
%0 = getelementptr inbounds %struct.entry, %struct.entry* %queue, i32 -1, i32 0, !dbg !29
%1 = getelementptr inbounds %struct.entry, %struct.entry* %queue, i32 -1, i32 0, !dbg !29
call void @llvm.dbg.value(metadata %struct.entry** %1, metadata !30, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 32)), !dbg !29
; CHECK: define void @salvage_gep1
; CHECK-NEXT: entry:
; CHECK-NEXT: call void @llvm.dbg.value(metadata %struct.entry* %queue,
; CHECK-SAME: metadata !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_stack_value, DW_OP_LLVM_fragment, 0, 32))
store %struct.entry** %1, %struct.entry*** %im_not_dead, align 8
ret void, !dbg !29
}
define void @salvage_gep2(%struct.entry* %queue, %struct.entry* %end) local_unnamed_addr #0 !dbg !31 {
entry:
%im_not_dead = alloca %struct.entry**
%0 = getelementptr inbounds %struct.entry, %struct.entry* %queue, i32 -1, i32 0, !dbg !32
%1 = getelementptr inbounds %struct.entry, %struct.entry* %queue, i32 -1, i32 0, !dbg !32
call void @llvm.dbg.value(metadata %struct.entry** %1, metadata !33, metadata !DIExpression(DW_OP_stack_value)), !dbg !32
; CHECK: define void @salvage_gep2
; CHECK-NEXT: entry:
; CHECK-NEXT: call void @llvm.dbg.value(metadata %struct.entry* %queue,
; CHECK-SAME: metadata !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_stack_value))
store %struct.entry** %1, %struct.entry*** %im_not_dead, align 8
ret void, !dbg !32
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
attributes #0 = { nounwind ssp uwtable }
attributes #1 = { nounwind readnone }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!10, !11, !12}
!llvm.ident = !{!13}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 5.0.0 (trunk 297628) (llvm/trunk 297643)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3)
!1 = !DIFile(filename: "test.c", directory: "/")
!2 = !{}
!3 = !{!4, !8}
!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64)
!5 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "entry", file: !1, line: 1, size: 64, elements: !6)
!6 = !{!7}
!7 = !DIDerivedType(tag: DW_TAG_member, name: "next", scope: !5, file: !1, line: 2, baseType: !4, size: 64)
!8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64)
!9 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
!10 = !{i32 2, !"Dwarf Version", i32 4}
!11 = !{i32 2, !"Debug Info Version", i32 3}
!12 = !{i32 1, !"PIC Level", i32 2}
!13 = !{!"clang version 5.0.0 (trunk 297628) (llvm/trunk 297643)"}
!14 = distinct !DISubprogram(name: "scan", scope: !1, file: !1, line: 4, type: !15, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !17)
!15 = !DISubroutineType(types: !16)
!16 = !{null, !4, !4}
!17 = !{!18}
!18 = !DILocalVariable(name: "entry", scope: !14, file: !1, line: 6, type: !4)
!19 = !DILocation(line: 6, column: 17, scope: !14)
!20 = !DIExpression(DW_OP_plus_uconst, 0)
!21 = !DILocation(line: 11, column: 1, scope: !14)
!22 = distinct !DISubprogram(name: "scan", scope: !1, file: !1, line: 4, type: !15, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !17)
!23 = !DILocation(line: 6, column: 17, scope: !22)
!24 = !DILocalVariable(name: "entry", scope: !22, file: !1, line: 6, type: !4)
!25 = distinct !DISubprogram(name: "scan", scope: !1, file: !1, line: 4, type: !15, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !17)
!26 = !DILocation(line: 6, column: 17, scope: !25)
!27 = !DILocalVariable(name: "entry", scope: !25, file: !1, line: 6, type: !4)
!28 = distinct !DISubprogram(name: "scan", scope: !1, file: !1, line: 4, type: !15, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !17)
!29 = !DILocation(line: 6, column: 17, scope: !28)
!30 = !DILocalVariable(name: "entry", scope: !28, file: !1, line: 6, type: !4)
!31 = distinct !DISubprogram(name: "scan", scope: !1, file: !1, line: 4, type: !15, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !17)
!32 = !DILocation(line: 6, column: 17, scope: !31)
!33 = !DILocalVariable(name: "entry", scope: !31, file: !1, line: 6, type: !4)
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