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https://github.com/RPCS3/llvm-mirror.git
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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
91 lines
3.8 KiB
LLVM
91 lines
3.8 KiB
LLVM
; RUN: opt %s -sroa -verify -S -o - | FileCheck %s
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; From:
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; struct prog_src_register {
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; unsigned : 4;
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; int Index : 12 + 1;
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; unsigned : 12;
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; unsigned : 4;
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; int : 12 + 1
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; } src_reg_for_float() {
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; struct prog_src_register a;
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; memset(&a, 0, sizeof(a));
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; int local = a.Index;
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; return a;
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; }
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; ModuleID = 'pr22495.c'
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; When SROA is creating new smaller allocas, it may add padding.
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;
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; There should be no debug info for the padding.
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; CHECK-NOT: DW_OP_LLVM_fragment, 56
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; CHECK: DIExpression(DW_OP_LLVM_fragment, 0, 32)
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; CHECK-NOT: DW_OP_LLVM_fragment, 56
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; CHECK: DIExpression(DW_OP_LLVM_fragment, 32, 24)
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; CHECK-NOT: DW_OP_LLVM_fragment, 56
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%struct.prog_src_register = type { i32, i24 }
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; Function Attrs: nounwind
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define i64 @src_reg_for_float() #0 !dbg !4 {
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entry:
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%retval = alloca %struct.prog_src_register, align 4
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%a = alloca %struct.prog_src_register, align 4
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%local = alloca i32, align 4
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call void @llvm.dbg.declare(metadata %struct.prog_src_register* %a, metadata !16, metadata !17), !dbg !18
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%0 = bitcast %struct.prog_src_register* %a to i8*, !dbg !19
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call void @llvm.memset.p0i8.i64(i8* align 4 %0, i8 0, i64 8, i1 false), !dbg !19
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call void @llvm.dbg.declare(metadata i32* %local, metadata !20, metadata !17), !dbg !21
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%1 = bitcast %struct.prog_src_register* %a to i32*, !dbg !21
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%bf.load = load i32, i32* %1, align 4, !dbg !21
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%bf.shl = shl i32 %bf.load, 15, !dbg !21
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%bf.ashr = ashr i32 %bf.shl, 19, !dbg !21
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store i32 %bf.ashr, i32* %local, align 4, !dbg !21
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%2 = bitcast %struct.prog_src_register* %retval to i8*, !dbg !22
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%3 = bitcast %struct.prog_src_register* %a to i8*, !dbg !22
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %2, i8* align 4 %3, i64 8, i1 false), !dbg !22
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%4 = bitcast %struct.prog_src_register* %retval to i64*, !dbg !22
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%5 = load i64, i64* %4, align 1, !dbg !22
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ret i64 %5, !dbg !22
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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; Function Attrs: nounwind
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declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i1) #2
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; Function Attrs: nounwind
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i1) #2
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attributes #0 = { nounwind }
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attributes #1 = { nounwind readnone }
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attributes #2 = { nounwind }
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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_C99, producer: "clang version 3.7.0 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "<stdin>", directory: "")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "src_reg_for_float", line: 7, isLocal: false, isDefinition: true, isOptimized: false, unit: !0, scopeLine: 7, file: !5, scope: !6, type: !7, retainedNodes: !2)
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!5 = !DIFile(filename: "pr22495.c", directory: "")
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!6 = !DIFile(filename: "pr22495.c", directory: "")
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!7 = !DISubroutineType(types: !8)
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!8 = !{!9}
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!9 = !DICompositeType(tag: DW_TAG_structure_type, name: "prog_src_register", line: 1, size: 64, align: 32, file: !5, elements: !10)
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!10 = !{!11}
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!11 = !DIDerivedType(tag: DW_TAG_member, name: "Index", line: 3, size: 13, align: 32, offset: 4, file: !5, scope: !9, baseType: !12)
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!12 = !DIBasicType(tag: DW_TAG_base_type, 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 3.7.0 "}
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!16 = !DILocalVariable(name: "a", line: 8, scope: !4, file: !6, type: !9)
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!17 = !DIExpression()
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!18 = !DILocation(line: 8, scope: !4)
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!19 = !DILocation(line: 9, scope: !4)
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!20 = !DILocalVariable(name: "local", line: 10, scope: !4, file: !6, type: !12)
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!21 = !DILocation(line: 10, scope: !4)
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!22 = !DILocation(line: 11, scope: !4)
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