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The Debugify pass synthesizes debug info for IR. It's paired with a
CheckDebugify pass which determines how much of the original debug info
is preserved. These passes make it easier to create targeted tests for
debug info preservation.
Here is the Debugify algorithm:
NextLine = 1
for (Instruction &I : M)
attach DebugLoc(NextLine++) to I
NextVar = 1
for (Instruction &I : M)
if (canAttachDebugValue(I))
attach dbg.value(NextVar++) to I
The CheckDebugify pass expects contiguous ranges of DILocations and
DILocalVariables. If it fails to find all of the expected debug info, it
prints a specific error to stderr which can be FileChecked.
This was discussed on llvm-dev in the thread:
"Passes to add/validate synthetic debug info"
Differential Revision: https://reviews.llvm.org/D40512
llvm-svn: 320202
66 lines
2.6 KiB
LLVM
66 lines
2.6 KiB
LLVM
; RUN: opt -debugify -S -o - < %s | FileCheck %s
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; RUN: opt -debugify -debugify -S -o - < %s 2>&1 | \
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; RUN: FileCheck %s -check-prefix=CHECK-REPEAT
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; RUN: opt -debugify -check-debugify -S -o - < %s | \
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; RUN: FileCheck %s -implicit-check-not="CheckDebugify: FAIL"
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; RUN: opt -debugify -strip -check-debugify -S -o - < %s | \
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; RUN: FileCheck %s -check-prefix=CHECK-FAIL
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; CHECK-LABEL: define void @foo
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define void @foo() {
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; CHECK: ret void, !dbg ![[RET1:.*]]
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ret void
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}
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; CHECK-LABEL: define i32 @bar
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define i32 @bar() {
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; CHECK: call void @foo(), !dbg ![[CALL1:.*]]
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call void @foo()
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; CHECK: add i32 0, 1, !dbg ![[ADD1:.*]]
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%sum = add i32 0, 1
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; CHECK: ret i32 0, !dbg ![[RET2:.*]]
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ret i32 0
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}
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; CHECK-DAG: !llvm.dbg.cu = !{![[CU:.*]]}
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; CHECK-DAG: !llvm.debugify = !{![[NUM_INSTS:.*]], ![[NUM_VARS:.*]]}
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; CHECK-DAG: ![[CU]] = distinct !DICompileUnit(language: DW_LANG_C, file: {{.*}}, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: {{.*}})
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; CHECK-DAG: !DIFile(filename: "<stdin>", directory: "/")
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; CHECK-DAG: distinct !DISubprogram(name: "foo", linkageName: "foo", scope: null, file: {{.*}}, line: 1, type: {{.*}}, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: {{.*}}, variables: {{.*}})
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; CHECK-DAG: distinct !DISubprogram(name: "bar", linkageName: "bar", scope: null, file: {{.*}}, line: 2, type: {{.*}}, isLocal: false, isDefinition: true, scopeLine: 2, isOptimized: true, unit: {{.*}}, variables: {{.*}})
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; --- DILocations
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; CHECK-DAG: ![[RET1]] = !DILocation(line: 1, column: 1
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; CHECK-DAG: ![[CALL1]] = !DILocation(line: 2, column: 1
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; CHECK-DAG: ![[ADD1]] = !DILocation(line: 3, column: 1
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; CHECK-DAG: ![[RET2]] = !DILocation(line: 4, column: 1
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; --- DILocalVariables
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; CHECK-DAG: ![[TY32:.*]] = !DIBasicType(name: "ty32", size: 32, encoding: DW_ATE_unsigned)
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; CHECK-DAG: !DILocalVariable(name: "1", scope: {{.*}}, file: {{.*}}, line: 3, type: ![[TY32]])
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; --- Metadata counts
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; CHECK-DAG: ![[NUM_INSTS]] = !{i32 4}
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; CHECK-DAG: ![[NUM_VARS]] = !{i32 1}
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; --- Repeat case
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; CHECK-REPEAT: Debugify: Skipping module with debug info
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; --- Failure case
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; CHECK-FAIL: ERROR: Instruction with empty DebugLoc -- ret void
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; CHECK-FAIL: ERROR: Instruction with empty DebugLoc -- call void @foo()
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; CHECK-FAIL: ERROR: Instruction with empty DebugLoc -- {{.*}} add i32 0, 1
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; CHECK-FAIL: ERROR: Instruction with empty DebugLoc -- ret i32 0
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; CHECK-FAIL: WARNING: Missing line 1
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; CHECK-FAIL: WARNING: Missing line 2
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; CHECK-FAIL: WARNING: Missing line 3
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; CHECK-FAIL: WARNING: Missing line 4
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; CHECK-FAIL: ERROR: Missing variable 1
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; CHECK-FAIL: CheckDebugify: FAIL
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