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
224 lines
10 KiB
LLVM
224 lines
10 KiB
LLVM
; RUN: opt -O0 -S -mergefunc -mergefunc-preserve-debug-info < %s | FileCheck %s --check-prefix=OPTIMIZATION_LEVEL_0
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; RUN: opt -O2 -S -mergefunc -mergefunc-preserve-debug-info < %s | FileCheck %s --check-prefix=OPTIMIZATION_LEVEL_2
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; Preserve debug info in thunks under -mergefunc -mergefunc-preserve-debug-info
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;
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; We test that:
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; At -O0 we have preserved the generated @llvm.dbg.declare debug intrinsics.
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; At -O2 we have preserved the generated @llvm.dbg.value debug intrinsics.
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; At -O0, stores from the incoming parameters to locations on the stack-frame
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; and allocas that create these locations on the stack-frame are preserved.
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; Debug info got generated for the call made by the thunk and for its return value.
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; The foregoing is the only content of a thunk's entry block.
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; A thunk makes a tail call to the shared implementation.
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; A thunk's call site is preserved to point to the thunk (with only -mergefunc the
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; call site is modified to point to the shared implementation) when both occur
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; within the same translation unit.
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; The source code that was used to test and generate this LLVM IR is:
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;
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; int maxA(int x, int y) {
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; int i, m, j;
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; if (x > y)
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; m = x;
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; else
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; m = y;
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; return m;
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; }
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;
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; int maxB(int x, int y) {
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; int i, m, j;
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; if (x > y)
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; m = x;
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; else
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; m = y;
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; return m;
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; }
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;
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; void f(void) {
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;
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; maxA(3, 4);
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; maxB(1, 9);
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; }
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; Function Attrs: nounwind uwtable
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define i32 @maxA(i32 %x, i32 %y) !dbg !6 {
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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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%i = alloca i32, align 4
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%m = alloca i32, align 4
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%j = alloca i32, align 4
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store i32 %x, i32* %x.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !11, metadata !12), !dbg !13
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store i32 %y, i32* %y.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %y.addr, metadata !14, metadata !12), !dbg !15
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call void @llvm.dbg.declare(metadata i32* %i, metadata !16, metadata !12), !dbg !17
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call void @llvm.dbg.declare(metadata i32* %m, metadata !18, metadata !12), !dbg !19
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call void @llvm.dbg.declare(metadata i32* %j, metadata !20, metadata !12), !dbg !21
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%0 = load i32, i32* %x.addr, align 4, !dbg !22
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%1 = load i32, i32* %y.addr, align 4, !dbg !24
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%cmp = icmp sgt i32 %0, %1, !dbg !25
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br i1 %cmp, label %if.then, label %if.else, !dbg !26
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if.then: ; preds = %entry
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%2 = load i32, i32* %x.addr, align 4, !dbg !27
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store i32 %2, i32* %m, align 4, !dbg !28
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br label %if.end, !dbg !29
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if.else: ; preds = %entry
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%3 = load i32, i32* %y.addr, align 4, !dbg !30
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store i32 %3, i32* %m, align 4, !dbg !31
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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%4 = load i32, i32* %m, align 4, !dbg !32
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ret i32 %4, !dbg !33
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata)
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; Function Attrs: nounwind uwtable
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define i32 @maxB(i32 %x, i32 %y) !dbg !34 {
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; OPTIMIZATION_LEVEL_0: define i32 @maxB(i32 %x, i32 %y)
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; OPTIMIZATION_LEVEL_0-NEXT: entry:
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; OPTIMIZATION_LEVEL_0-NEXT: %x.addr = alloca i32, align 4
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; OPTIMIZATION_LEVEL_0-NEXT: %y.addr = alloca i32, align 4
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; OPTIMIZATION_LEVEL_0-NEXT: store i32 %x, i32* %x.addr, align 4
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; OPTIMIZATION_LEVEL_0-NEXT: call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !{{[0-9]+}}, metadata !DIExpression()), !dbg !{{[0-9]+}}
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; OPTIMIZATION_LEVEL_0-NEXT: store i32 %y, i32* %y.addr, align 4
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; OPTIMIZATION_LEVEL_0-NEXT: call void @llvm.dbg.declare(metadata i32* %y.addr, metadata !{{[0-9]+}}, metadata !DIExpression()), !dbg !{{[0-9]+}}
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; OPTIMIZATION_LEVEL_0-NEXT: %0 = tail call i32 @maxA(i32 %x, i32 %y), !dbg !{{[0-9]+}}
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; OPTIMIZATION_LEVEL_0-NEXT: ret i32 %0, !dbg !{{[0-9]+}}
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; OPTIMIZATION_LEVEL_0-NEXT: }
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; OPTIMIZATION_LEVEL_2: define i32 @maxB(i32 %x, i32 %y)
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; OPTIMIZATION_LEVEL_2-NEXT: entry:
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; OPTIMIZATION_LEVEL_2-NEXT: call void @llvm.dbg.value(metadata i32 %x, metadata !{{[0-9]+}}, metadata !DIExpression()), !dbg !{{[0-9]+}}
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; OPTIMIZATION_LEVEL_2-NEXT: call void @llvm.dbg.value(metadata i32 %y, metadata !{{[0-9]+}}, metadata !DIExpression()), !dbg !{{[0-9]+}}
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; OPTIMIZATION_LEVEL_2-NEXT: %0 = tail call i32 @maxA(i32 %x, i32 %y) #{{[0-9]+}}, !dbg !{{[0-9]+}}
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; OPTIMIZATION_LEVEL_2-NEXT: ret i32 %0, !dbg !{{[0-9]+}}
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; OPTIMIZATION_LEVEL_2-NEXT: }
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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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%i = alloca i32, align 4
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%m = alloca i32, align 4
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%j = alloca i32, align 4
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store i32 %x, i32* %x.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !35, metadata !12), !dbg !36
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store i32 %y, i32* %y.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %y.addr, metadata !37, metadata !12), !dbg !38
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call void @llvm.dbg.declare(metadata i32* %i, metadata !39, metadata !12), !dbg !40
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call void @llvm.dbg.declare(metadata i32* %m, metadata !41, metadata !12), !dbg !42
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call void @llvm.dbg.declare(metadata i32* %j, metadata !43, metadata !12), !dbg !44
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%0 = load i32, i32* %x.addr, align 4, !dbg !45
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%1 = load i32, i32* %y.addr, align 4, !dbg !47
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%cmp = icmp sgt i32 %0, %1, !dbg !48
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br i1 %cmp, label %if.then, label %if.else, !dbg !49
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if.then: ; preds = %entry
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%2 = load i32, i32* %x.addr, align 4, !dbg !50
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store i32 %2, i32* %m, align 4, !dbg !51
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br label %if.end, !dbg !52
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if.else: ; preds = %entry
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%3 = load i32, i32* %y.addr, align 4, !dbg !53
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store i32 %3, i32* %m, align 4, !dbg !54
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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%4 = load i32, i32* %m, align 4, !dbg !55
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ret i32 %4, !dbg !56
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}
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; Function Attrs: nounwind uwtable
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define void @f() !dbg !57 {
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entry:
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; OPTIMIZATION_LEVEL_0: define void @f()
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; OPTIMIZATION_LEVEL_0-NEXT: entry:
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; OPTIMIZATION_LEVEL_0-NEXT: %call = call i32 @maxA(i32 3, i32 4), !dbg !{{[0-9]+}}
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; OPTIMIZATION_LEVEL_0-NEXT: %call1 = call i32 @maxB(i32 1, i32 9), !dbg !{{[0-9]+}}
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; OPTIMIZATION_LEVEL_0-NEXT: ret void, !dbg !{{[0-9]+}}
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; OPTIMIZATION_LEVEL_2: define void @f()
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; OPTIMIZATION_LEVEL_2-NEXT: entry:
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; OPTIMIZATION_LEVEL_2-NEXT: ret void, !dbg !{{[0-9]+}}
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%call = call i32 @maxA(i32 3, i32 4), !dbg !60
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%call1 = call i32 @maxB(i32 1, i32 9), !dbg !61
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ret void, !dbg !62
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!llvm.ident = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "mergefunc-preserve-debug-info.c", directory: "")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{!""}
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!6 = distinct !DISubprogram(name: "maxA", scope: !7, file: !7, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!7 = !DIFile(filename: "./mergefunc-preserve-debug-info.c", directory: "")
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !10, !10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !DILocalVariable(name: "x", arg: 1, scope: !6, file: !7, line: 1, type: !10)
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!12 = !DIExpression()
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!13 = !DILocation(line: 1, column: 14, scope: !6)
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!14 = !DILocalVariable(name: "y", arg: 2, scope: !6, file: !7, line: 1, type: !10)
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!15 = !DILocation(line: 1, column: 21, scope: !6)
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!16 = !DILocalVariable(name: "i", scope: !6, file: !7, line: 2, type: !10)
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!17 = !DILocation(line: 2, column: 7, scope: !6)
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!18 = !DILocalVariable(name: "m", scope: !6, file: !7, line: 2, type: !10)
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!19 = !DILocation(line: 2, column: 10, scope: !6)
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!20 = !DILocalVariable(name: "j", scope: !6, file: !7, line: 2, type: !10)
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!21 = !DILocation(line: 2, column: 13, scope: !6)
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!22 = !DILocation(line: 3, column: 7, scope: !23)
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!23 = distinct !DILexicalBlock(scope: !6, file: !7, line: 3, column: 7)
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!24 = !DILocation(line: 3, column: 11, scope: !23)
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!25 = !DILocation(line: 3, column: 9, scope: !23)
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!26 = !DILocation(line: 3, column: 7, scope: !6)
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!27 = !DILocation(line: 4, column: 9, scope: !23)
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!28 = !DILocation(line: 4, column: 7, scope: !23)
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!29 = !DILocation(line: 4, column: 5, scope: !23)
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!30 = !DILocation(line: 6, column: 9, scope: !23)
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!31 = !DILocation(line: 6, column: 7, scope: !23)
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!32 = !DILocation(line: 7, column: 10, scope: !6)
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!33 = !DILocation(line: 7, column: 3, scope: !6)
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!34 = distinct !DISubprogram(name: "maxB", scope: !7, file: !7, line: 10, type: !8, isLocal: false, isDefinition: true, scopeLine: 10, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!35 = !DILocalVariable(name: "x", arg: 1, scope: !34, file: !7, line: 10, type: !10)
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!36 = !DILocation(line: 10, column: 14, scope: !34)
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!37 = !DILocalVariable(name: "y", arg: 2, scope: !34, file: !7, line: 10, type: !10)
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!38 = !DILocation(line: 10, column: 21, scope: !34)
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!39 = !DILocalVariable(name: "i", scope: !34, file: !7, line: 11, type: !10)
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!40 = !DILocation(line: 11, column: 7, scope: !34)
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!41 = !DILocalVariable(name: "m", scope: !34, file: !7, line: 11, type: !10)
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!42 = !DILocation(line: 11, column: 10, scope: !34)
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!43 = !DILocalVariable(name: "j", scope: !34, file: !7, line: 11, type: !10)
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!44 = !DILocation(line: 11, column: 13, scope: !34)
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!45 = !DILocation(line: 12, column: 7, scope: !46)
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!46 = distinct !DILexicalBlock(scope: !34, file: !7, line: 12, column: 7)
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!47 = !DILocation(line: 12, column: 11, scope: !46)
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!48 = !DILocation(line: 12, column: 9, scope: !46)
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!49 = !DILocation(line: 12, column: 7, scope: !34)
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!50 = !DILocation(line: 13, column: 9, scope: !46)
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!51 = !DILocation(line: 13, column: 7, scope: !46)
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!52 = !DILocation(line: 13, column: 5, scope: !46)
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!53 = !DILocation(line: 15, column: 9, scope: !46)
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!54 = !DILocation(line: 15, column: 7, scope: !46)
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!55 = !DILocation(line: 16, column: 10, scope: !34)
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!56 = !DILocation(line: 16, column: 3, scope: !34)
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!57 = distinct !DISubprogram(name: "f", scope: !7, file: !7, line: 19, type: !58, isLocal: false, isDefinition: true, scopeLine: 19, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!58 = !DISubroutineType(types: !59)
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!59 = !{null}
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!60 = !DILocation(line: 21, column: 3, scope: !57)
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!61 = !DILocation(line: 22, column: 3, scope: !57)
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!62 = !DILocation(line: 23, column: 1, scope: !57)
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