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57907269da
so we can stop using DW_OP_bit_piece with the wrong semantics. The entire back story can be found here: http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20161114/405934.html The gist is that in LLVM we've been misinterpreting DW_OP_bit_piece's offset field to mean the offset into the source variable rather than the offset into the location at the top the DWARF expression stack. In order to be able to fix this in a subsequent patch, this patch introduces a dedicated DW_OP_LLVM_fragment operation with the semantics that we used to apply to DW_OP_bit_piece, which is what we actually need while inside of LLVM. This patch is complete with a bitcode upgrade for expressions using the old format. It does not yet fix the DWARF backend to use DW_OP_bit_piece correctly. Implementation note: We discussed several options for implementing this, including reserving a dedicated field in DIExpression for the fragment size and offset, but using an custom operator at the end of the expression works just fine and is more efficient because we then only pay for it when we need it. Differential Revision: https://reviews.llvm.org/D27361 rdar://problem/29335809 llvm-svn: 288683
141 lines
6.6 KiB
LLVM
141 lines
6.6 KiB
LLVM
; RUN: opt -inline -S < %s | FileCheck %s
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; struct A {
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; int arg0;
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; double arg1[2];
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; } a, b;
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;
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; void fn3(A p1) {
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; if (p1.arg0)
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; a = p1;
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; }
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;
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; void fn4() { fn3(b); }
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;
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; void fn5() {
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; while (1)
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; fn4();
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; }
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; ModuleID = 'test.cpp'
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target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
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target triple = "aarch64-apple-darwin"
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%struct.A = type { i32, [2 x double] }
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@a = global %struct.A zeroinitializer, align 8, !dbg !26
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@b = global %struct.A zeroinitializer, align 8, !dbg !27
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; Function Attrs: nounwind
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declare void @_Z3fn31A(%struct.A* nocapture readonly %p1) #0
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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.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) #2
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; Function Attrs: nounwind
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define void @_Z3fn4v() #0 !dbg !21 {
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entry:
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; Test that the dbg.declare is moved together with the alloca.
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; CHECK: define void @_Z3fn5v()
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %agg.tmp.sroa.3.i = alloca [20 x i8], align 4
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; CHECK-NEXT: call void @llvm.dbg.declare(metadata [20 x i8]* %agg.tmp.sroa.3.i,
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%agg.tmp.sroa.3 = alloca [20 x i8], align 4
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tail call void @llvm.dbg.declare(metadata [20 x i8]* %agg.tmp.sroa.3, metadata !46, metadata !48), !dbg !49
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%agg.tmp.sroa.0.0.copyload = load i32, i32* getelementptr inbounds (%struct.A, %struct.A* @b, i64 0, i32 0), align 8, !dbg !50
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tail call void @llvm.dbg.value(metadata i32 %agg.tmp.sroa.0.0.copyload, i64 0, metadata !46, metadata !51), !dbg !49
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%agg.tmp.sroa.3.0..sroa_idx = getelementptr inbounds [20 x i8], [20 x i8]* %agg.tmp.sroa.3, i64 0, i64 0, !dbg !50
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %agg.tmp.sroa.3.0..sroa_idx, i8* getelementptr (i8, i8* bitcast (%struct.A* @b to i8*), i64 4), i64 20, i32 4, i1 false), !dbg !50
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tail call void @llvm.dbg.declare(metadata %struct.A* undef, metadata !46, metadata !31) #2, !dbg !49
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%tobool.i = icmp eq i32 %agg.tmp.sroa.0.0.copyload, 0, !dbg !52
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br i1 %tobool.i, label %_Z3fn31A.exit, label %if.then.i, !dbg !53
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if.then.i: ; preds = %entry
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store i32 %agg.tmp.sroa.0.0.copyload, i32* getelementptr inbounds (%struct.A, %struct.A* @a, i64 0, i32 0), align 8, !dbg !54
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* getelementptr (i8, i8* bitcast (%struct.A* @a to i8*), i64 4), i8* %agg.tmp.sroa.3.0..sroa_idx, i64 20, i32 4, i1 false), !dbg !54
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br label %_Z3fn31A.exit, !dbg !54
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_Z3fn31A.exit: ; preds = %entry, %if.then.i
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ret void, !dbg !50
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}
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; Function Attrs: noreturn nounwind
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define void @_Z3fn5v() #3 !dbg !24 {
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entry:
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br label %while.body, !dbg !55
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while.body: ; preds = %entry, %while.body
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call void @_Z3fn4v(), !dbg !56
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br label %while.body, !dbg !55
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
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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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attributes #3 = { noreturn nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!28, !29}
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!llvm.ident = !{!30}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.7.0 (trunk 227480) (llvm/trunk 227517)", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !3, globals: !25, imports: !2)
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!1 = !DIFile(filename: "<stdin>", directory: "")
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!2 = !{}
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!3 = !{!4}
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!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "A", line: 1, size: 192, align: 64, file: !5, elements: !6, identifier: "_ZTS1A")
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!5 = !DIFile(filename: "test.cpp", directory: "")
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!6 = !{!7, !9}
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!7 = !DIDerivedType(tag: DW_TAG_member, name: "arg0", line: 2, size: 32, align: 32, file: !5, scope: !4, baseType: !8)
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !DIDerivedType(tag: DW_TAG_member, name: "arg1", line: 3, size: 128, align: 64, offset: 64, file: !5, scope: !4, baseType: !10)
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!10 = !DICompositeType(tag: DW_TAG_array_type, size: 128, align: 64, baseType: !11, elements: !12)
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!11 = !DIBasicType(tag: DW_TAG_base_type, name: "double", size: 64, align: 64, encoding: DW_ATE_float)
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!12 = !{!13}
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!13 = !DISubrange(count: 2)
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!15 = distinct !DISubprogram(name: "fn3", linkageName: "_Z3fn31A", line: 6, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 6, file: !5, scope: !16, type: !17, variables: !19)
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!16 = !DIFile(filename: "test.cpp", directory: "")
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!17 = !DISubroutineType(types: !18)
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!18 = !{null, !4}
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!19 = !{!20}
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!20 = !DILocalVariable(name: "p1", line: 6, arg: 1, scope: !15, file: !16, type: !4)
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!21 = distinct !DISubprogram(name: "fn4", linkageName: "_Z3fn4v", line: 11, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 11, file: !5, scope: !16, type: !22, variables: !2)
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!22 = !DISubroutineType(types: !23)
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!23 = !{null}
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!24 = distinct !DISubprogram(name: "fn5", linkageName: "_Z3fn5v", line: 13, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 13, file: !5, scope: !16, type: !22, variables: !2)
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!25 = !{!26, !27}
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!26 = !DIGlobalVariable(name: "a", line: 4, isLocal: false, isDefinition: true, scope: null, file: !16, type: !4)
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!27 = !DIGlobalVariable(name: "b", line: 4, isLocal: false, isDefinition: true, scope: null, file: !16, type: !4)
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!28 = !{i32 2, !"Dwarf Version", i32 4}
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!29 = !{i32 2, !"Debug Info Version", i32 3}
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!30 = !{!"clang version 3.7.0 (trunk 227480) (llvm/trunk 227517)"}
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!31 = !DIExpression(DW_OP_deref)
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!32 = !DILocation(line: 6, scope: !15)
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!33 = !DILocation(line: 7, scope: !34)
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!34 = distinct !DILexicalBlock(line: 7, column: 0, file: !5, scope: !15)
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!35 = !{!36, !37, i64 0}
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!36 = !{!4, !37, i64 0, !38, i64 8}
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!37 = !{!"int", !38, i64 0}
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!38 = !{!"omnipotent char", !39, i64 0}
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!39 = !{!"Simple C/C++ TBAA"}
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!40 = !DILocation(line: 7, scope: !15)
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!41 = !DILocation(line: 8, scope: !34)
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!42 = !{i64 0, i64 4, !43, i64 8, i64 16, !44}
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!43 = !{!37, !37, i64 0}
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!44 = !{!38, !38, i64 0}
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!45 = !DILocation(line: 9, scope: !15)
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!46 = !DILocalVariable(name: "p1", line: 6, arg: 1, scope: !15, file: !16, type: !4)
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!47 = distinct !DILocation(line: 11, scope: !21)
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!48 = !DIExpression(DW_OP_LLVM_fragment, 32, 160)
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!49 = !DILocation(line: 6, scope: !15, inlinedAt: !47)
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!50 = !DILocation(line: 11, scope: !21)
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!51 = !DIExpression(DW_OP_LLVM_fragment, 0, 32)
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!52 = !DILocation(line: 7, scope: !34, inlinedAt: !47)
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!53 = !DILocation(line: 7, scope: !15, inlinedAt: !47)
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!54 = !DILocation(line: 8, scope: !34, inlinedAt: !47)
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!55 = !DILocation(line: 14, scope: !24)
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!56 = !DILocation(line: 15, scope: !24)
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