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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
84 lines
2.9 KiB
LLVM
84 lines
2.9 KiB
LLVM
; RUN: opt -mem2reg -instcombine %s -o - -S | FileCheck %s
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;
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; Test that a dbg.declare describing am alloca with volatile
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; load/stores is not lowered into a dbg.value, since the alloca won't
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; be elided anyway.
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;
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; Generated from:
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;
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; unsigned long long g();
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; void h(unsigned long long);
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; void f() {
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; volatile unsigned long long v = g();
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; if (v == 0)
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; g();
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; h(v);
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; }
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; CHECK: alloca i64
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; CHECK-NOT: call void @llvm.dbg.value
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; CHECK: call void @llvm.dbg.declare
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; CHECK-NOT: call void @llvm.dbg.value
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source_filename = "volatile.c"
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; Function Attrs: nounwind optsize ssp uwtable
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define void @f() local_unnamed_addr #0 !dbg !8 {
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%1 = alloca i64, align 8
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%2 = bitcast i64* %1 to i8*, !dbg !15
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call void @llvm.lifetime.start.p0i8(i64 8, i8* %2), !dbg !15
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call void @llvm.dbg.declare(metadata i64* %1, metadata !12, metadata !DIExpression()), !dbg !15
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%3 = call i64 (...) @g() #4, !dbg !15
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store volatile i64 %3, i64* %1, align 8, !dbg !15
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%4 = load volatile i64, i64* %1, align 8, !dbg !15
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%5 = icmp eq i64 %4, 0, !dbg !15
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br i1 %5, label %6, label %8, !dbg !15
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; <label>:6: ; preds = %0
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%7 = call i64 (...) @g() #4, !dbg !15
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br label %8, !dbg !15
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; <label>:8: ; preds = %6, %0
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%9 = load volatile i64, i64* %1, align 8, !dbg !15
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call void @h(i64 %9) #4, !dbg !15
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call void @llvm.lifetime.end.p0i8(i64 8, i8* %2), !dbg !15
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ret void, !dbg !15
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}
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
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; Function Attrs: optsize
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declare i64 @g(...) local_unnamed_addr #3
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; Function Attrs: optsize
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declare void @h(i64) local_unnamed_addr #3
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1
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attributes #0 = { nounwind optsize ssp uwtable }
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attributes #1 = { argmemonly nounwind }
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attributes #2 = { nounwind readnone speculatable }
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attributes #3 = { optsize }
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attributes #4 = { optsize }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
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!1 = !DIFile(filename: "volatile.c", directory: "/")
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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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!8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 3, type: !9, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !0, retainedNodes: !11)
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!9 = !DISubroutineType(types: !10)
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!10 = !{null}
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!11 = !{!12}
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!12 = !DILocalVariable(name: "v", scope: !8, file: !1, line: 4, type: !13)
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!13 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !14)
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!14 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned)
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!15 = !DILocation(line: 4, column: 3, scope: !8)
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