2c864551df
In order to set breakpoints on labels and list source code around labels, we need collect debug information for labels, i.e., label name, the function label belong, line number in the file, and the address label located. In order to keep these information in LLVM IR and to allow backend to generate debug information correctly. We create a new kind of metadata for labels, DILabel. The format of DILabel is !DILabel(scope: !1, name: "foo", file: !2, line: 3) We hope to keep debug information as much as possible even the code is optimized. So, we create a new kind of intrinsic for label metadata to avoid the metadata is eliminated with basic block. The intrinsic will keep existing if we keep it from optimized out. The format of the intrinsic is llvm.dbg.label(metadata !1) It has only one argument, that is the DILabel metadata. The intrinsic will follow the label immediately. Backend could get the label metadata through the intrinsic's parameter. We also create DIBuilder API for labels to be used by Frontend. Frontend could use createLabel() to allocate DILabel objects, and use insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR. Differential Revision: https://reviews.llvm.org/D45024 Patch by Hsiangkai Wang. llvm-svn: 331841
226 lines
10 KiB
LLVM
226 lines
10 KiB
LLVM
; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/remarks.prof -S -pass-remarks=sample-profile -pass-remarks-output=%t.opt.yaml 2>&1 | FileCheck %s
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; RUN: FileCheck %s -check-prefix=YAML < %t.opt.yaml
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; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/remarks.prof -S -pass-remarks=sample-profile -pass-remarks-output=%t.opt.yaml 2>&1 | FileCheck %s
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; RUN: FileCheck %s -check-prefix=YAML < %t.opt.yaml
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; Original test case.
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;
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; 1 #include <stdlib.h>
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; 2
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; 3 long long foo() {
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; 4 long long int sum = 0;
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; 5 for (int i = 0; i < 500000000; i++)
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; 6 if (i < 1000)
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; 7 sum -= i;
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; 8 else
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; 9 sum += -i * rand();
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; 10 return sum;
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; 11 }
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; 12
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; 13 int main() { return foo() > 0; }
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; We are expecting foo() to be inlined in main() (almost all the cycles are
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; spent inside foo).
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; CHECK: remark: remarks.cc:13:21: inlined hot callee '_Z3foov' into 'main'
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; The back edge for the loop is the hottest edge in the loop subgraph.
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; CHECK: remark: remarks.cc:6:9: most popular destination for conditional branches at remarks.cc:5:3
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; The predicate almost always chooses the 'else' branch.
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; CHECK: remark: remarks.cc:9:15: most popular destination for conditional branches at remarks.cc:6:9
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; Checking to see if YAML file is generated and contains remarks
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;YAML: --- !Passed
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;YAML-NEXT: Pass: sample-profile
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;YAML-NEXT: Name: HotInline
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;YAML-NEXT: DebugLoc: { File: remarks.cc, Line: 13, Column: 21 }
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;YAML-NEXT: Function: main
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;YAML-NEXT: Args:
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;YAML-NEXT: - String: 'inlined hot callee '''
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;YAML-NEXT: - Callee: _Z3foov
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;YAML-NEXT: DebugLoc: { File: remarks.cc, Line: 3, Column: 0 }
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;YAML-NEXT: - String: ''' into '''
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;YAML-NEXT: - Caller: main
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;YAML-NEXT: DebugLoc: { File: remarks.cc, Line: 13, Column: 0 }
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;YAML-NEXT: - String: ''''
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;YAML-NEXT: ...
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;YAML: --- !Analysis
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;YAML-NEXT: Pass: sample-profile
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;YAML-NEXT: Name: AppliedSamples
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;YAML-NEXT: DebugLoc: { File: remarks.cc, Line: 5, Column: 8 }
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;YAML-NEXT: Function: main
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;YAML-NEXT: Args:
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;YAML-NEXT: - String: 'Applied '
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;YAML-NEXT: - NumSamples: '18305'
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;YAML-NEXT: - String: ' samples from profile (offset: '
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;YAML-NEXT: - LineOffset: '2'
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;YAML-NEXT: - String: ')'
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;YAML-NEXT: ...
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;YAML: --- !Passed
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;YAML-NEXT: Pass: sample-profile
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;YAML-NEXT: Name: PopularDest
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;YAML-NEXT: DebugLoc: { File: remarks.cc, Line: 6, Column: 9 }
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;YAML-NEXT: Function: main
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;YAML-NEXT: Args:
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;YAML-NEXT: - String: 'most popular destination for conditional branches at '
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;YAML-NEXT: - CondBranchesLoc: 'remarks.cc:5:3'
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;YAML-NEXT: DebugLoc: { File: remarks.cc, Line: 5, Column: 3 }
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;YAML-NEXT: ...
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; Function Attrs: nounwind uwtable
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define i64 @_Z3foov() #0 !dbg !4 {
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entry:
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%sum = alloca i64, align 8
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%i = alloca i32, align 4
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%0 = bitcast i64* %sum to i8*, !dbg !19
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call void @llvm.lifetime.start.p0i8(i64 8, i8* %0) #4, !dbg !19
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call void @llvm.dbg.declare(metadata i64* %sum, metadata !9, metadata !20), !dbg !21
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store i64 0, i64* %sum, align 8, !dbg !21, !tbaa !22
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%1 = bitcast i32* %i to i8*, !dbg !26
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call void @llvm.lifetime.start.p0i8(i64 4, i8* %1) #4, !dbg !26
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call void @llvm.dbg.declare(metadata i32* %i, metadata !10, metadata !20), !dbg !27
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store i32 0, i32* %i, align 4, !dbg !27, !tbaa !28
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br label %for.cond, !dbg !26
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for.cond: ; preds = %for.inc, %entry
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%2 = load i32, i32* %i, align 4, !dbg !30, !tbaa !28
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%cmp = icmp slt i32 %2, 500000000, !dbg !34
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br i1 %cmp, label %for.body, label %for.cond.cleanup, !dbg !35
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for.cond.cleanup: ; preds = %for.cond
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%3 = bitcast i32* %i to i8*, !dbg !36
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call void @llvm.lifetime.end.p0i8(i64 4, i8* %3) #4, !dbg !36
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br label %for.end
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for.body: ; preds = %for.cond
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%4 = load i32, i32* %i, align 4, !dbg !38, !tbaa !28
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%cmp1 = icmp slt i32 %4, 1000, !dbg !40
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br i1 %cmp1, label %if.then, label %if.else, !dbg !41
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if.then: ; preds = %for.body
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%5 = load i32, i32* %i, align 4, !dbg !42, !tbaa !28
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%conv = sext i32 %5 to i64, !dbg !42
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%6 = load i64, i64* %sum, align 8, !dbg !43, !tbaa !22
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%sub = sub nsw i64 %6, %conv, !dbg !43
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store i64 %sub, i64* %sum, align 8, !dbg !43, !tbaa !22
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br label %if.end, !dbg !44
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if.else: ; preds = %for.body
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%7 = load i32, i32* %i, align 4, !dbg !45, !tbaa !28
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%sub2 = sub nsw i32 0, %7, !dbg !46
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%call = call i32 @rand() #4, !dbg !47
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%mul = mul nsw i32 %sub2, %call, !dbg !48
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%conv3 = sext i32 %mul to i64, !dbg !46
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%8 = load i64, i64* %sum, align 8, !dbg !49, !tbaa !22
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%add = add nsw i64 %8, %conv3, !dbg !49
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store i64 %add, i64* %sum, align 8, !dbg !49, !tbaa !22
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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br label %for.inc, !dbg !50
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for.inc: ; preds = %if.end
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%9 = load i32, i32* %i, align 4, !dbg !51, !tbaa !28
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%inc = add nsw i32 %9, 1, !dbg !51
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store i32 %inc, i32* %i, align 4, !dbg !51, !tbaa !28
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br label %for.cond, !dbg !52
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for.end: ; preds = %for.cond.cleanup
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%10 = load i64, i64* %sum, align 8, !dbg !53, !tbaa !22
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%11 = bitcast i64* %sum to i8*, !dbg !54
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call void @llvm.lifetime.end.p0i8(i64 8, i8* %11) #4, !dbg !54
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ret i64 %10, !dbg !55
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}
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; Function Attrs: nounwind argmemonly
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declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
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; Function Attrs: nounwind
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declare i32 @rand() #3
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; Function Attrs: nounwind argmemonly
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declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1
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; Function Attrs: nounwind uwtable
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define i32 @main() #0 !dbg !13 {
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entry:
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%retval = alloca i32, align 4
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store i32 0, i32* %retval, align 4
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%call = call i64 @_Z3foov(), !dbg !56
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%cmp = icmp sgt i64 %call, 0, !dbg !57
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%conv = zext i1 %cmp to i32, !dbg !56
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ret i32 %conv, !dbg !58
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}
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attributes #0 = { nounwind uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind argmemonly }
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attributes #2 = { nounwind readnone }
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attributes #3 = { nounwind "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #4 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!16, !17}
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!llvm.ident = !{!18}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 251041) (llvm/trunk 251053)", isOptimized: true, runtimeVersion: 0, emissionKind: NoDebug, enums: !2)
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!1 = !DIFile(filename: "remarks.cc", directory: ".")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !8)
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7}
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!7 = !DIBasicType(name: "long long int", size: 64, align: 64, encoding: DW_ATE_signed)
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!8 = !{!9, !10}
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!9 = !DILocalVariable(name: "sum", scope: !4, file: !1, line: 4, type: !7)
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!10 = !DILocalVariable(name: "i", scope: !11, file: !1, line: 5, type: !12)
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!11 = distinct !DILexicalBlock(scope: !4, file: !1, line: 5, column: 3)
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!12 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!13 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 13, type: !14, isLocal: false, isDefinition: true, scopeLine: 13, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !2)
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!14 = !DISubroutineType(types: !15)
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!15 = !{!12}
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!16 = !{i32 2, !"Dwarf Version", i32 4}
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!17 = !{i32 2, !"Debug Info Version", i32 3}
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!18 = !{!"clang version 3.8.0 (trunk 251041) (llvm/trunk 251053)"}
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!19 = !DILocation(line: 4, column: 3, scope: !4)
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!20 = !DIExpression()
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!21 = !DILocation(line: 4, column: 17, scope: !4)
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!22 = !{!23, !23, i64 0}
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!23 = !{!"long long", !24, i64 0}
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!24 = !{!"omnipotent char", !25, i64 0}
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!25 = !{!"Simple C/C++ TBAA"}
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!26 = !DILocation(line: 5, column: 8, scope: !11)
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!27 = !DILocation(line: 5, column: 12, scope: !11)
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!28 = !{!29, !29, i64 0}
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!29 = !{!"int", !24, i64 0}
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!30 = !DILocation(line: 5, column: 19, scope: !31)
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!31 = !DILexicalBlockFile(scope: !32, file: !1, discriminator: 3)
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!32 = !DILexicalBlockFile(scope: !33, file: !1, discriminator: 1)
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!33 = distinct !DILexicalBlock(scope: !11, file: !1, line: 5, column: 3)
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!34 = !DILocation(line: 5, column: 21, scope: !33)
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!35 = !DILocation(line: 5, column: 3, scope: !11)
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!36 = !DILocation(line: 5, column: 3, scope: !37)
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!37 = !DILexicalBlockFile(scope: !33, file: !1, discriminator: 2)
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!38 = !DILocation(line: 6, column: 9, scope: !39)
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!39 = distinct !DILexicalBlock(scope: !33, file: !1, line: 6, column: 9)
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!40 = !DILocation(line: 6, column: 11, scope: !39)
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!41 = !DILocation(line: 6, column: 9, scope: !33)
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!42 = !DILocation(line: 7, column: 14, scope: !39)
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!43 = !DILocation(line: 7, column: 11, scope: !39)
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!44 = !DILocation(line: 7, column: 7, scope: !39)
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!45 = !DILocation(line: 9, column: 15, scope: !39)
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!46 = !DILocation(line: 9, column: 14, scope: !39)
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!47 = !DILocation(line: 9, column: 19, scope: !39)
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!48 = !DILocation(line: 9, column: 17, scope: !39)
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!49 = !DILocation(line: 9, column: 11, scope: !39)
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!50 = !DILocation(line: 6, column: 13, scope: !39)
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!51 = !DILocation(line: 5, column: 35, scope: !33)
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!52 = !DILocation(line: 5, column: 3, scope: !33)
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!53 = !DILocation(line: 10, column: 10, scope: !4)
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!54 = !DILocation(line: 11, column: 1, scope: !4)
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!55 = !DILocation(line: 10, column: 3, scope: !4)
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!56 = !DILocation(line: 13, column: 21, scope: !13)
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!57 = !DILocation(line: 13, column: 27, scope: !13)
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!58 = !DILocation(line: 13, column: 14, scope: !13)
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