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a2029fa58e
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
136 lines
6.5 KiB
LLVM
136 lines
6.5 KiB
LLVM
; RUN: opt < %s -instcombine -sample-profile -sample-profile-file=%S/Inputs/inline-coverage.prof -sample-profile-check-record-coverage=100 -sample-profile-check-sample-coverage=110 -pass-remarks=sample-profile -pass-remarks-analysis=sample-profile -o /dev/null 2>&1 | FileCheck %s
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; RUN: opt < %s -passes="function(instcombine),sample-profile" -sample-profile-file=%S/Inputs/inline-coverage.prof -sample-profile-check-record-coverage=100 -sample-profile-check-sample-coverage=110 -pass-remarks=sample-profile -pass-remarks-analysis=sample-profile -o /dev/null 2>&1 | FileCheck %s
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;
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; Original code:
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;
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; 1 #include <stdlib.h>
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; 2
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; 3 long long int foo(long i) {
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; 4 return rand() * i;
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; 5 }
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; 6
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; 7 int main() {
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; 8 long long int sum = 0;
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; 9 for (int i = 0; i < 200000 * 3000; i++)
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; 10 sum += foo(i);
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; 11 return sum > 0 ? 0 : 1;
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; 12 }
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;
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; CHECK: remark: coverage.cc:10:12: inlined hot callee '_Z3fool' into 'main'
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; CHECK: remark: coverage.cc:9:21: Applied 23478 samples from profile (offset: 2.1)
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; CHECK: remark: coverage.cc:10:16: Applied 23478 samples from profile (offset: 3)
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; CHECK: remark: coverage.cc:4:10: Applied 31878 samples from profile (offset: 1)
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; CHECK: remark: coverage.cc:11:10: Applied 0 samples from profile (offset: 4)
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; CHECK: remark: coverage.cc:10:16: most popular destination for conditional branches at coverage.cc:9:3
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;
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; There is one sample record with 0 samples at offset 4 in main() that we never
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; use:
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; CHECK: warning: coverage.cc:7: 4 of 5 available profile records (80%) were applied
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;
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; Since the unused sample record contributes no samples, sample coverage should
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; be 100%. Note that we get this warning because we are requesting an impossible
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; 110% coverage check.
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; CHECK: warning: coverage.cc:7: 78834 of 78834 available profile samples (100%) were applied
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define i64 @_Z3fool(i64 %i) !dbg !4 {
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entry:
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%i.addr = alloca i64, align 8
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store i64 %i, i64* %i.addr, align 8
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call void @llvm.dbg.declare(metadata i64* %i.addr, metadata !16, metadata !17), !dbg !18
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%call = call i32 @rand(), !dbg !19
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%conv = sext i32 %call to i64, !dbg !19
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%0 = load i64, i64* %i.addr, align 8, !dbg !20
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%mul = mul nsw i64 %conv, %0, !dbg !21
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ret i64 %mul, !dbg !22
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata)
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declare i32 @rand()
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define i32 @main() !dbg !9 {
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entry:
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%retval = alloca i32, align 4
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%sum = alloca i64, align 8
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%i = alloca i32, align 4
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store i32 0, i32* %retval, align 4
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call void @llvm.dbg.declare(metadata i64* %sum, metadata !23, metadata !17), !dbg !24
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store i64 0, i64* %sum, align 8, !dbg !24
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call void @llvm.dbg.declare(metadata i32* %i, metadata !25, metadata !17), !dbg !27
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store i32 0, i32* %i, align 4, !dbg !27
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br label %for.cond, !dbg !28
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for.cond: ; preds = %for.inc, %entry
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%0 = load i32, i32* %i, align 4, !dbg !29
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%cmp = icmp slt i32 %0, 600000000, !dbg !32
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br i1 %cmp, label %for.body, label %for.end, !dbg !33
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for.body: ; preds = %for.cond
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%1 = load i32, i32* %i, align 4, !dbg !34
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%conv = sext i32 %1 to i64, !dbg !34
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%call = call i64 @_Z3fool(i64 %conv), !dbg !35
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%2 = load i64, i64* %sum, align 8, !dbg !36
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%add = add nsw i64 %2, %call, !dbg !36
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store i64 %add, i64* %sum, align 8, !dbg !36
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br label %for.inc, !dbg !37
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for.inc: ; preds = %for.body
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%3 = load i32, i32* %i, align 4, !dbg !38
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%inc = add nsw i32 %3, 1, !dbg !38
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store i32 %inc, i32* %i, align 4, !dbg !38
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br label %for.cond, !dbg !39
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for.end: ; preds = %for.cond
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%4 = load i64, i64* %sum, align 8, !dbg !40
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%cmp1 = icmp sgt i64 %4, 0, !dbg !41
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%cond = select i1 %cmp1, i32 0, i32 1, !dbg !40
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ret i32 %cond, !dbg !42
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!13, !14}
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!llvm.ident = !{!15}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 251738) (llvm/trunk 251737)", isOptimized: false, runtimeVersion: 0, emissionKind: NoDebug, enums: !2)
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!1 = !DIFile(filename: "coverage.cc", directory: ".")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fool", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7, !8}
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!7 = !DIBasicType(name: "long long int", size: 64, align: 64, encoding: DW_ATE_signed)
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!8 = !DIBasicType(name: "long int", size: 64, align: 64, encoding: DW_ATE_signed)
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!9 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 7, type: !10, isLocal: false, isDefinition: true, scopeLine: 7, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!10 = !DISubroutineType(types: !11)
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!11 = !{!12}
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!12 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!13 = !{i32 2, !"Dwarf Version", i32 4}
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!14 = !{i32 2, !"Debug Info Version", i32 3}
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!15 = !{!"clang version 3.8.0 (trunk 251738) (llvm/trunk 251737)"}
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!16 = !DILocalVariable(name: "i", arg: 1, scope: !4, file: !1, line: 3, type: !8)
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!17 = !DIExpression()
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!18 = !DILocation(line: 3, column: 24, scope: !4)
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!19 = !DILocation(line: 4, column: 10, scope: !4)
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!20 = !DILocation(line: 4, column: 19, scope: !4)
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!21 = !DILocation(line: 4, column: 17, scope: !4)
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!22 = !DILocation(line: 4, column: 3, scope: !4)
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!23 = !DILocalVariable(name: "sum", scope: !9, file: !1, line: 8, type: !7)
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!24 = !DILocation(line: 8, column: 17, scope: !9)
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!25 = !DILocalVariable(name: "i", scope: !26, file: !1, line: 9, type: !12)
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!26 = distinct !DILexicalBlock(scope: !9, file: !1, line: 9, column: 3)
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!27 = !DILocation(line: 9, column: 12, scope: !26)
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!28 = !DILocation(line: 9, column: 8, scope: !26)
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!29 = !DILocation(line: 9, column: 19, scope: !30)
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!30 = !DILexicalBlockFile(scope: !31, file: !1, discriminator: 2)
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!31 = distinct !DILexicalBlock(scope: !26, file: !1, line: 9, column: 3)
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!32 = !DILocation(line: 9, column: 21, scope: !30)
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!33 = !DILocation(line: 9, column: 3, scope: !30)
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!34 = !DILocation(line: 10, column: 16, scope: !31)
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!35 = !DILocation(line: 10, column: 12, scope: !31)
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!36 = !DILocation(line: 10, column: 9, scope: !31)
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!37 = !DILocation(line: 10, column: 5, scope: !31)
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!38 = !DILocation(line: 9, column: 39, scope: !31)
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!39 = !DILocation(line: 9, column: 3, scope: !31)
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!40 = !DILocation(line: 11, column: 10, scope: !9)
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!41 = !DILocation(line: 11, column: 14, scope: !9)
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!42 = !DILocation(line: 11, column: 3, scope: !9)
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