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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
134 lines
3.0 KiB
LLVM
134 lines
3.0 KiB
LLVM
; Test CFG simplify removal of branch instructions.
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;
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; RUN: opt < %s -simplifycfg -S | FileCheck %s
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; RUN: opt < %s -passes=simplify-cfg -S | FileCheck %s
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define void @test1() {
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br label %1
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ret void
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: ret void
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}
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define void @test2() {
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ret void
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ret void
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: ret void
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; CHECK-NEXT: }
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}
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define void @test3(i1 %T) {
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br i1 %T, label %1, label %1
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ret void
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: ret void
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}
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; Folding branch to a common destination.
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; CHECK-LABEL: @test4_fold
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; CHECK: %cmp1 = icmp eq i32 %a, %b
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; CHECK: %cmp2 = icmp ugt i32 %a, 0
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; CHECK: %or.cond = and i1 %cmp1, %cmp2
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; CHECK: br i1 %or.cond, label %else, label %untaken
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; CHECK-NOT: taken:
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; CHECK: ret void
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define void @test4_fold(i32 %a, i32 %b) {
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%cmp1 = icmp eq i32 %a, %b
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br i1 %cmp1, label %taken, label %untaken
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taken:
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%cmp2 = icmp ugt i32 %a, 0
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br i1 %cmp2, label %else, label %untaken
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else:
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call void @foo()
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ret void
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untaken:
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ret void
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}
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; Prefer a simplification based on a dominating condition rather than folding a
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; branch to a common destination.
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; CHECK-LABEL: @test4
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; CHECK-NOT: br
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; CHECK-NOT: br
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; CHECK-NOT: call
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; CHECK: ret void
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define void @test4_no_fold(i32 %a, i32 %b) {
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%cmp1 = icmp eq i32 %a, %b
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br i1 %cmp1, label %taken, label %untaken
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taken:
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%cmp2 = icmp ugt i32 %a, %b
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br i1 %cmp2, label %else, label %untaken
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else:
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call void @foo()
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ret void
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untaken:
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ret void
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}
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declare void @foo()
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; PR5795
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define void @test5(i32 %A) {
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switch i32 %A, label %return [
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i32 2, label %1
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i32 10, label %2
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]
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ret void
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ret void
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return: ; preds = %entry
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ret void
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; CHECK-LABEL: @test5(
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; CHECK-NEXT: ret void
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}
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; PR14893
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define i8 @test6f() {
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; CHECK-LABEL: @test6f
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; CHECK: alloca i8, align 1
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; CHECK-NEXT: call i8 @test6g
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; CHECK-NEXT: icmp eq i8 %tmp, 0
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; CHECK-NEXT: load i8, i8* %r, align 1, !dbg !{{[0-9]+$}}
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bb0:
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%r = alloca i8, align 1
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%tmp = call i8 @test6g(i8* %r)
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%tmp1 = icmp eq i8 %tmp, 0
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br i1 %tmp1, label %bb2, label %bb1
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bb1:
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%tmp3 = load i8, i8* %r, align 1, !range !2, !tbaa !10, !dbg !5
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%tmp4 = icmp eq i8 %tmp3, 1
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br i1 %tmp4, label %bb2, label %bb3
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bb2:
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br label %bb3
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bb3:
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%tmp6 = phi i8 [ 0, %bb2 ], [ 1, %bb1 ]
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ret i8 %tmp6
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}
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declare i8 @test6g(i8*)
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!llvm.dbg.cu = !{!3}
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!llvm.module.flags = !{!8, !9}
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!0 = !{!10, !10, i64 0}
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!1 = !{!"foo"}
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!2 = !{i8 0, i8 2}
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!3 = distinct !DICompileUnit(language: DW_LANG_C99, file: !7, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !4)
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!4 = !{}
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!5 = !DILocation(line: 23, scope: !6)
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!6 = distinct !DISubprogram(name: "foo", scope: !3, file: !7, line: 1, type: !DISubroutineType(types: !4), isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !3, retainedNodes: !4)
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!7 = !DIFile(filename: "foo.c", directory: "/")
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!8 = !{i32 2, !"Dwarf Version", i32 2}
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!9 = !{i32 2, !"Debug Info Version", i32 3}
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!10 = !{!"scalar type", !1}
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