360abb7ee5
After extracting, fix up debug info in both the old and new functions by 1) Pointing line locations and debug intrinsics to the new subprogram scope, and 2) Deleting intrinsics which point to values outside of the new function. Depends on https://reviews.llvm.org/D72795. Testing: check-llvm, check-clang, a build of LNT in the `-Os -g` config with "-mllvm -hot-cold-split=1" set, and end-to-end debugging of a toy program which undergoes splitting to verify that lldb can find variables, single step, etc. in extracted code. rdar://45507940 Differential Revision: https://reviews.llvm.org/D72801
56 lines
2.1 KiB
LLVM
56 lines
2.1 KiB
LLVM
; RUN: opt -hotcoldsplit -hotcoldsplit-threshold=0 -S < %s | FileCheck %s
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; When an llvm.dbg.label intrinsic is extracted into a new function, make sure
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; that its metadata argument is a DILabel that points to a scope within the new
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; function.
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;
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; In this example, the label "bye" points to the scope for @foo before
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; splitting, and should point to the scope for @foo.cold.1 after splitting.
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.14.0"
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; CHECK-LABEL: define {{.*}}@foo.cold.1
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; CHECK: llvm.dbg.label(metadata [[LABEL:![0-9]+]]), !dbg [[LINE:![0-9]+]]
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; CHECK: [[FILE:![0-9]+]] = !DIFile
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; CHECK: [[SCOPE:![0-9]+]] = distinct !DISubprogram(name: "foo.cold.1"
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; CHECK: [[LINE]] = !DILocation(line: 1, column: 1, scope: [[SCOPE]]
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; CHECK: [[LABEL]] = !DILabel(scope: [[SCOPE]], name: "bye", file: [[FILE]], line: 28
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define void @foo(i32 %arg1) !dbg !6 {
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entry:
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%var = add i32 0, 0, !dbg !11
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br i1 undef, label %if.then, label %if.end
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if.then: ; preds = %entry
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ret void
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if.end: ; preds = %entry
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call void @llvm.dbg.label(metadata !12), !dbg !11
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call void @sink()
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ret void
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}
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declare void @llvm.dbg.label(metadata)
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declare void @sink() cold
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!llvm.dbg.cu = !{!0}
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!llvm.debugify = !{!3, !4}
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!llvm.module.flags = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "<stdin>", directory: "/")
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!2 = !{}
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!3 = !{i32 7}
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!4 = !{i32 1}
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!5 = !{i32 2, !"Debug Info Version", i32 3}
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!6 = distinct !DISubprogram(name: "foo", linkageName: "foo", scope: null, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, retainedNodes: !8)
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!7 = !DISubroutineType(types: !2)
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!8 = !{!9}
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!9 = !DILocalVariable(name: "1", scope: !6, file: !1, line: 1, type: !10)
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!10 = !DIBasicType(name: "ty32", size: 32, encoding: DW_ATE_unsigned)
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!11 = !DILocation(line: 1, column: 1, scope: !6)
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!12 = !DILabel(scope: !6, name: "bye", file: !1, line: 28)
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