77 lines
3.7 KiB
LLVM
77 lines
3.7 KiB
LLVM
; RUN: opt -S -instcombine %s | FileCheck %s -check-prefix=RUN-ONCE
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; This example was reduced from a test case in which InstCombine ran at least
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; twice:
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; - The first InstCombine run converted dbg.declares to dbg.values using the
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; LowerDbgDeclare utility. This produced a dbg.value(i32* %2, DW_OP_deref)
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; (this happens when the contents of an alloca are passed by-value), and a
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; dbg.value(i32 %0) (due to the store of %0 into the alloca).
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; - The second InstCombine run deleted the alloca (%2).
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; Check that the DW_OP_deref dbg.value is deleted, just like a dbg.declare would
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; be.
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;
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; RUN-ONCE-LABEL: @t1(
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; RUN-ONCE-NEXT: llvm.dbg.value(metadata i32 %0, metadata [[t1_arg0:![0-9]+]], metadata !DIExpression())
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; RUN-ONCE-NEXT: llvm.dbg.value(metadata i32* undef, metadata [[t1_fake_ptr:![0-9]+]], metadata !DIExpression())
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; RUN-ONCE-NEXT: ret void
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define void @t1(i32) !dbg !9 {
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%2 = alloca i32, align 4
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store i32 %0, i32* %2, align 4
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call void @llvm.dbg.value(metadata i32 %0, metadata !14, metadata !DIExpression()), !dbg !15
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call void @llvm.dbg.value(metadata i32* %2, metadata !14, metadata !DIExpression(DW_OP_deref)), !dbg !15
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call void @llvm.dbg.value(metadata i32* %2, metadata !20, metadata !DIExpression()), !dbg !15
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ret void
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}
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; This example is closer to an end-to-end test: the IR looks like it could have
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; been produced by a frontend compiling at -O0.
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;
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; Here's what happens:
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; 1) We run InstCombine. This puts a dbg.value(i32* %x.addr, DW_OP_deref)
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; before the call to @use, and a dbg.value(i32 %x) after the store.
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; 2) We inline @use.
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; 3) We run InstCombine again. The alloca %x.addr is erased. We should just get
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; dbg.value(i32 %x). There should be no leftover dbg.value(metadata i32*
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; undef).
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;
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;;; define void @use(i32* %addr) alwaysinline { ret void }
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;;; define void @t2(i32 %x) !dbg !17 {
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;;; %x.addr = alloca i32, align 4
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;;; store i32 %x, i32* %x.addr, align 4
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;;; call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !18, metadata !DIExpression()), !dbg !19
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;;; call void @use(i32* %x.addr)
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;;; ret void
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;;; }
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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declare void @llvm.dbg.declare(metadata, metadata, metadata)
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!llvm.module.flags = !{!0, !1, !2, !3, !4}
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!llvm.dbg.cu = !{!5}
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!llvm.ident = !{!8}
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; RUN-ONCE: [[t1_arg0]] = !DILocalVariable(name: "a"
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; RUN-ONCE: [[t1_fake_ptr]] = !DILocalVariable(name: "fake_ptr"
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!0 = !{i32 2, !"SDK Version", [2 x i32] [i32 10, i32 14]}
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!1 = !{i32 2, !"Dwarf Version", i32 4}
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!2 = !{i32 2, !"Debug Info Version", i32 3}
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!3 = !{i32 1, !"wchar_size", i32 4}
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!4 = !{i32 7, !"PIC Level", i32 2}
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!5 = distinct !DICompileUnit(language: DW_LANG_C99, file: !6, producer: "", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !7, nameTableKind: GNU)
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!6 = !DIFile(filename: "-", directory: "/")
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!7 = !{}
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!8 = !{!""}
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!9 = distinct !DISubprogram(name: "t1", scope: !10, file: !10, line: 1, type: !11, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !7)
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!10 = !DIFile(filename: "<stdin>", directory: "/")
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!11 = !DISubroutineType(types: !12)
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!12 = !{null, !13}
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!13 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!14 = !DILocalVariable(name: "a", arg: 1, scope: !9, file: !10, line: 1, type: !13)
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!15 = !DILocation(line: 1, column: 13, scope: !9)
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!16 = !DILocation(line: 1, column: 17, scope: !9)
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!17 = distinct !DISubprogram(name: "t2", scope: !10, file: !10, line: 1, type: !11, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !7)
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!18 = !DILocalVariable(name: "x", arg: 1, scope: !17, file: !10, line: 1, type: !13)
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!19 = !DILocation(line: 1, column: 1, scope: !17)
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!20 = !DILocalVariable(name: "fake_ptr", scope: !9, file: !10, line: 1, type: !13)
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