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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
117 lines
4.8 KiB
LLVM
117 lines
4.8 KiB
LLVM
; RUN: opt < %s -instcombine -sample-profile -sample-profile-file=%S/Inputs/calls.prof | opt -analyze -branch-prob | FileCheck %s
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; RUN: opt < %s -passes="function(instcombine),sample-profile" -sample-profile-file=%S/Inputs/calls.prof | opt -analyze -branch-prob | FileCheck %s
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; Original C++ test case
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;
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; #include <stdio.h>
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;
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; int sum(int x, int y) {
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; return x + y;
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; }
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;
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; int main() {
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; int s, i = 0;
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; while (i++ < 20000 * 20000)
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; if (i != 100) s = sum(i, s); else s = 30;
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; printf("sum is %d\n", s);
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; return 0;
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; }
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;
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@.str = private unnamed_addr constant [11 x i8] c"sum is %d\0A\00", align 1
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; Function Attrs: nounwind uwtable
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define i32 @_Z3sumii(i32 %x, i32 %y) !dbg !4 {
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entry:
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%x.addr = alloca i32, align 4
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%y.addr = alloca i32, align 4
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store i32 %x, i32* %x.addr, align 4
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store i32 %y, i32* %y.addr, align 4
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%0 = load i32, i32* %x.addr, align 4, !dbg !11
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%1 = load i32, i32* %y.addr, align 4, !dbg !11
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%add = add nsw i32 %0, %1, !dbg !11
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ret i32 %add, !dbg !11
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}
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; Function Attrs: uwtable
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define i32 @main() !dbg !7 {
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entry:
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%retval = alloca i32, align 4
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%s = alloca i32, align 4
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%i = alloca i32, align 4
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store i32 0, i32* %retval
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store i32 0, i32* %i, align 4, !dbg !12
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br label %while.cond, !dbg !13
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while.cond: ; preds = %if.end, %entry
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%0 = load i32, i32* %i, align 4, !dbg !14
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%inc = add nsw i32 %0, 1, !dbg !14
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store i32 %inc, i32* %i, align 4, !dbg !14
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%cmp = icmp slt i32 %0, 400000000, !dbg !14
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br i1 %cmp, label %while.body, label %while.end, !dbg !14
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; CHECK: edge while.cond -> while.body probability is 0x77f2798d / 0x80000000 = 93.71% [HOT edge]
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; CHECK: edge while.cond -> while.end probability is 0x080d8673 / 0x80000000 = 6.29%
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while.body: ; preds = %while.cond
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%1 = load i32, i32* %i, align 4, !dbg !16
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%cmp1 = icmp ne i32 %1, 100, !dbg !16
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br i1 %cmp1, label %if.then, label %if.else, !dbg !16
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; Without discriminator information, the profiler used to think that
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; both branches out of while.body had the same weight. In reality,
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; the edge while.body->if.then is taken most of the time.
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;
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; CHECK: edge while.body -> if.else probability is 0x0005b1e0 / 0x80000000 = 0.02%
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; CHECK: edge while.body -> if.then probability is 0x7ffa4e20 / 0x80000000 = 99.98% [HOT edge]
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if.then: ; preds = %while.body
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%2 = load i32, i32* %i, align 4, !dbg !18
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%3 = load i32, i32* %s, align 4, !dbg !18
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%call = call i32 @_Z3sumii(i32 %2, i32 %3), !dbg !18
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store i32 %call, i32* %s, align 4, !dbg !18
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br label %if.end, !dbg !18
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if.else: ; preds = %while.body
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store i32 30, i32* %s, align 4, !dbg !20
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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 %while.cond, !dbg !22
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while.end: ; preds = %while.cond
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%4 = load i32, i32* %s, align 4, !dbg !24
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%call2 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i32 0, i32 0), i32 %4), !dbg !24
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ret i32 0, !dbg !25
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}
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declare i32 @printf(i8*, ...) #2
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!8, !9}
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!llvm.ident = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5 ", isOptimized: false, emissionKind: NoDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "calls.cc", directory: ".")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "sum", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 3, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!5 = !DIFile(filename: "calls.cc", directory: ".")
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!6 = !DISubroutineType(types: !2)
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!7 = distinct !DISubprogram(name: "main", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 7, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!8 = !{i32 2, !"Dwarf Version", i32 4}
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!9 = !{i32 1, !"Debug Info Version", i32 3}
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!10 = !{!"clang version 3.5 "}
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!11 = !DILocation(line: 4, scope: !4)
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!12 = !DILocation(line: 8, scope: !7)
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!13 = !DILocation(line: 9, scope: !7)
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!14 = !DILocation(line: 9, scope: !15)
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!15 = !DILexicalBlockFile(discriminator: 2, file: !1, scope: !7)
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!16 = !DILocation(line: 10, scope: !17)
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!17 = distinct !DILexicalBlock(line: 10, column: 0, file: !1, scope: !7)
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!18 = !DILocation(line: 10, scope: !19)
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!19 = !DILexicalBlockFile(discriminator: 2, file: !1, scope: !17)
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!20 = !DILocation(line: 10, scope: !21)
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!21 = !DILexicalBlockFile(discriminator: 4, file: !1, scope: !17)
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!22 = !DILocation(line: 10, scope: !23)
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!23 = !DILexicalBlockFile(discriminator: 6, file: !1, scope: !17)
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!24 = !DILocation(line: 11, scope: !7)
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!25 = !DILocation(line: 12, scope: !7)
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