114 lines
4.5 KiB
LLVM
114 lines
4.5 KiB
LLVM
; RUN: llc -mtriple=x86_64-unknown-unknown %s -o - -stop-after=livedebugvalues -experimental-debug-variable-locations=true | FileCheck %s
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;
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; In the simple loop below, the location of the variable "toast" is %bar in
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; the entry block, then set to constant zero at the end of the loop. We cannot
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; know the location of "toast" at the start of the %loop block. Test that no
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; location is given until after the call to @booler.
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;
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; Second function @baz added with an even tighter loop -- this tests different
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; code-paths through LiveDebugValues. Any blocks with an incoming backedge need
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; reconsideration after the parent of the backedge has had its OutLocs
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; initialized, even if OutLocs hasn't changed.
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;
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; Third function @quux tests that we don't delete too many variable locations.
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; A variable that is live across the body of the loop should maintain its
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; location across that loop, and not be invalidated.
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;
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; CHECK: ![[FOOVARNUM:[0-9]+]] = !DILocalVariable(name: "toast"
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; CHECK: ![[BAZVARNUM:[0-9]+]] = !DILocalVariable(name: "crumpets"
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; CHECK: ![[QUUXVARNUM:[0-9]+]] = !DILocalVariable(name: "teacake"
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;
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; foo tests
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; CHECK-LABEL: bb.1.loop
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; CHECK-NOT: DBG_VALUE
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; CHECK-LABEL: CALL64pcrel32 @booler
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; CHECK: DBG_VALUE 0, $noreg, ![[FOOVARNUM]]
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;
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; baz tests
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; CHECK-LABEL: name: baz
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; CHECK-LABEL: bb.1.loop
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; CHECK-NOT: DBG_VALUE
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; CHECK-LABEL: CALL64pcrel32 @booler
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; CHECK: DBG_VALUE 0, $noreg, ![[BAZVARNUM]]
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;
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; quux tests -- the variable arrives in $edi, should get a non-undef location
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; before the loop, and its position re-stated in each block.
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; CHECK-LABEL: name: quux
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; CHECK: DBG_VALUE $edi, $noreg, ![[QUUXVARNUM]]
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; CHECK-LABEL: bb.1.loop
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; CHECK: DBG_VALUE $ebx, $noreg, ![[QUUXVARNUM]]
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; CHECK-NOT: DBG_VALUE $noreg
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; CHECK-LABEL: bb.2.exit
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; CHECK: DBG_VALUE $ebx, $noreg, ![[QUUXVARNUM]]
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; CHECK-NOT: DBG_VALUE $noreg
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declare dso_local i1 @booler()
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declare dso_local void @escape(i32)
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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@glob = global i32 0
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define i32 @foo(i32 %bar) !dbg !4 {
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entry:
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call void @llvm.dbg.value(metadata i32 %bar, metadata !3, metadata !DIExpression()), !dbg !6
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br label %loop
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loop:
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call void @escape(i32 %bar)
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%retval = call i1 @booler(), !dbg !6
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call void @llvm.dbg.value(metadata i32 0, metadata !3, metadata !DIExpression()), !dbg !6
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br i1 %retval, label %loop2, label %exit
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loop2:
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store i32 %bar, i32 *@glob
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br label %loop
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exit:
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ret i32 %bar
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}
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define i32 @baz(i32 %bar) !dbg !104 {
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entry:
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call void @llvm.dbg.value(metadata i32 %bar, metadata !103, metadata !DIExpression()), !dbg !106
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br label %loop
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loop:
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call void @escape(i32 %bar)
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%retval = call i1 @booler(), !dbg !106
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call void @llvm.dbg.value(metadata i32 0, metadata !103, metadata !DIExpression()), !dbg !106
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br i1 %retval, label %loop, label %exit
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exit:
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ret i32 %bar
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}
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define i32 @quux(i32 %bar) !dbg !204 {
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entry:
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; %bar will be placed in a nonvolatile or spill location for the loop,
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; before being returned later.
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call void @llvm.dbg.value(metadata i32 %bar, metadata !203, metadata !DIExpression()), !dbg !206
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br label %loop
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loop:
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%retval = call i1 @booler(), !dbg !206
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br i1 %retval, label %loop, label %exit
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exit:
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ret i32 %bar
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}
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!llvm.module.flags = !{!0, !100}
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!llvm.dbg.cu = !{!1}
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!100 = !{i32 2, !"Dwarf Version", i32 4}
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!0 = !{i32 2, !"Debug Info Version", i32 3}
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!1 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !2, producer: "beards", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
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!2 = !DIFile(filename: "bees.cpp", directory: ".")
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!3 = !DILocalVariable(name: "toast", scope: !4, file: !2, line: 1, type: !16)
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!4 = distinct !DISubprogram(name: "nope", scope: !2, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !13, type: !14, isDefinition: true)
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!6 = !DILocation(line: 1, scope: !4)
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!13 = !{!3}
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!14 = !DISubroutineType(types: !15)
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!15 = !{!16}
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!16 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!103 = !DILocalVariable(name: "crumpets", scope: !104, file: !2, line: 1, type: !16)
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!104 = distinct !DISubprogram(name: "ribbit", scope: !2, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !113, type: !14, isDefinition: true)
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!106 = !DILocation(line: 1, scope: !104)
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!113 = !{!103}
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!203 = !DILocalVariable(name: "teacake", scope: !204, file: !2, line: 1, type: !16)
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!204 = distinct !DISubprogram(name: "toad", scope: !2, file: !2, line: 1, spFlags: DISPFlagDefinition, unit: !1, retainedNodes: !113, type: !14, isDefinition: true)
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!206 = !DILocation(line: 1, scope: !204)
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!213 = !{!203}
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