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llvm-project/llvm/test/DebugInfo/X86/this-stack_value.ll

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Add a testcase for DIExpression(DW_OP_stack_value) and relax the assertion that prohibited its emission. This fixes the assertion failure uncovered by r301093. llvm-svn: 301209
2017-04-25 02:11:38 +08:00
; RUN: llc -filetype=asm -o - %s | FileCheck %s --check-prefix=ASM
Improve the accuracy of variable ranges .debug_loc location lists. For the following motivating example bool c(); void f(); bool start() { bool result = c(); if (!c()) { result = false; goto exit; } f(); result = true; exit: return result; } we would previously generate a single DW_AT_const_value(1) because only the DBG_VALUE in the second-to-last basic block survived codegen. This patch improves the heuristic used to determine when a DBG_VALUE is available at the beginning of its variable's enclosing lexical scope: - Stop giving singular constants blanket permission to take over the entire scope. There is still a special case for constants in the function prologue that we also miight want to retire later. - Use the lexical scope information to determine available-at-entry instead of proximity to the function prologue. After this patch we generate a location list with a more accurate narrower availability for the constant true value. As a pleasant side effect, we also generate inline locations instead of location lists where a loacation covers the entire range of the enclosing lexical scope. Measured on compiling llc with four targets this doesn't have an effect on compile time and reduces the size of the debug info for llc by ~600K. rdar://problem/30286912 llvm-svn: 305599
2017-06-17 06:40:04 +08:00
; RUN: llc -filetype=obj -o - %s | llvm-dwarfdump --debug-dump=info - | FileCheck %s
Add a testcase for DIExpression(DW_OP_stack_value) and relax the assertion that prohibited its emission. This fixes the assertion failure uncovered by r301093. llvm-svn: 301209
2017-04-25 02:11:38 +08:00
;
; Generated at -O2 from:
; struct B;
; class A {
; int a1 = 23;
; int a2 = 42;
; };
; struct B {
; A a;
; int b = 48;
; };
;
; B *getB() { return new B(); }
;
; The inlined A::this pointer has the same location as B::this, but it may not be
; modified by the debugger.
;
Print complete DIExpressions in the assembler output DEBUG_VALUE comments. The previous code was complex, incorrect, and couldn't print everything. llvm-svn: 301333
2017-04-26 01:22:09 +08:00
; ASM: [DW_OP_stack_value]
Improve the accuracy of variable ranges .debug_loc location lists. For the following motivating example bool c(); void f(); bool start() { bool result = c(); if (!c()) { result = false; goto exit; } f(); result = true; exit: return result; } we would previously generate a single DW_AT_const_value(1) because only the DBG_VALUE in the second-to-last basic block survived codegen. This patch improves the heuristic used to determine when a DBG_VALUE is available at the beginning of its variable's enclosing lexical scope: - Stop giving singular constants blanket permission to take over the entire scope. There is still a special case for constants in the function prologue that we also miight want to retire later. - Use the lexical scope information to determine available-at-entry instead of proximity to the function prologue. After this patch we generate a location list with a more accurate narrower availability for the constant true value. As a pleasant side effect, we also generate inline locations instead of location lists where a loacation covers the entire range of the enclosing lexical scope. Measured on compiling llc with four targets this doesn't have an effect on compile time and reduces the size of the debug info for llc by ~600K. rdar://problem/30286912 llvm-svn: 305599
2017-06-17 06:40:04 +08:00
; CHECK: DW_AT_location {{.*}} 70 00 9f
Add a testcase for DIExpression(DW_OP_stack_value) and relax the assertion that prohibited its emission. This fixes the assertion failure uncovered by r301093. llvm-svn: 301209
2017-04-25 02:11:38 +08:00
; rax+0, stack-value
source_filename = "ab.cpp"
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.12.0"
%struct.B = type { %class.A, i32 }
%class.A = type { i32, i32 }
; Function Attrs: ssp uwtable
define noalias nonnull %struct.B* @_Z4getBv() local_unnamed_addr #0 !dbg !7 {
entry:
%call = tail call i8* @_Znwm(i64 12) #3, !dbg !20
%0 = bitcast i8* %call to %struct.B*, !dbg !20
tail call void @llvm.dbg.value(metadata %struct.B* %0, i64 0, metadata !21, metadata !28), !dbg !29
tail call void @llvm.dbg.value(metadata %struct.B* %0, i64 0, metadata !31, metadata !28), !dbg !34
tail call void @llvm.dbg.value(metadata %struct.B* %0, i64 0, metadata !36, metadata !44), !dbg !45
tail call void @llvm.dbg.value(metadata %struct.B* %0, i64 0, metadata !47, metadata !44), !dbg !50
%a1.i.i.i.i = bitcast i8* %call to i32*, !dbg !52
store i32 23, i32* %a1.i.i.i.i, align 4, !dbg !52, !tbaa !53
%a2.i.i.i.i = getelementptr inbounds i8, i8* %call, i64 4, !dbg !58
%1 = bitcast i8* %a2.i.i.i.i to i32*, !dbg !58
store i32 42, i32* %1, align 4, !dbg !58, !tbaa !59
%b.i.i = getelementptr inbounds i8, i8* %call, i64 8, !dbg !60
%2 = bitcast i8* %b.i.i to i32*, !dbg !60
store i32 48, i32* %2, align 4, !dbg !60, !tbaa !61
ret %struct.B* %0, !dbg !63
}
declare noalias nonnull i8* @_Znwm(i64) local_unnamed_addr #1
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
attributes #0 = { ssp uwtable }
attributes #1 = { nobuiltin }
attributes #2 = { nounwind readnone }
attributes #3 = { builtin }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 5.0.0 (trunk 301093) (llvm/trunk 301093)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "ab.cpp", directory: "/")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"PIC Level", i32 2}
!7 = distinct !DISubprogram(name: "getB", linkageName: "_Z4getBv", scope: !1, file: !1, line: 11, type: !8, isLocal: false, isDefinition: true, scopeLine: 11, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !2)
!8 = !DISubroutineType(types: !9)
!9 = !{!10}
!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64)
!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "B", file: !1, line: 6, size: 96, elements: !12, identifier: "_ZTS1B")
!12 = !{!13, !19}
!13 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !11, file: !1, line: 7, baseType: !14, size: 64)
!14 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "A", file: !1, line: 2, size: 64, elements: !15, identifier: "_ZTS1A")
!15 = !{!16, !18}
!16 = !DIDerivedType(tag: DW_TAG_member, name: "a1", scope: !14, file: !1, line: 3, baseType: !17, size: 32)
!17 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!18 = !DIDerivedType(tag: DW_TAG_member, name: "a2", scope: !14, file: !1, line: 4, baseType: !17, size: 32, offset: 32)
!19 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !11, file: !1, line: 8, baseType: !17, size: 32, offset: 64)
!20 = !DILocation(line: 11, column: 20, scope: !7)
!21 = !DILocalVariable(name: "this", arg: 1, scope: !22, type: !10, flags: DIFlagArtificial | DIFlagObjectPointer)
!22 = distinct !DISubprogram(name: "B", linkageName: "_ZN1BC1Ev", scope: !11, file: !1, line: 6, type: !23, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagArtificial | DIFlagPrototyped, isOptimized: true, unit: !0, declaration: !26, variables: !27)
!23 = !DISubroutineType(types: !24)
!24 = !{null, !25}
!25 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
!26 = !DISubprogram(name: "B", scope: !11, type: !23, isLocal: false, isDefinition: false, flags: DIFlagArtificial | DIFlagPrototyped, isOptimized: true)
!27 = !{!21}
!28 = !DIExpression()
!29 = !DILocation(line: 0, scope: !22, inlinedAt: !30)
!30 = distinct !DILocation(line: 11, column: 24, scope: !7)
!31 = !DILocalVariable(name: "this", arg: 1, scope: !32, type: !10, flags: DIFlagArtificial | DIFlagObjectPointer)
!32 = distinct !DISubprogram(name: "B", linkageName: "_ZN1BC2Ev", scope: !11, file: !1, line: 6, type: !23, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagArtificial | DIFlagPrototyped, isOptimized: true, unit: !0, declaration: !26, variables: !33)
!33 = !{!31}
!34 = !DILocation(line: 0, scope: !32, inlinedAt: !35)
!35 = distinct !DILocation(line: 6, column: 8, scope: !22, inlinedAt: !30)
!36 = !DILocalVariable(name: "this", arg: 1, scope: !37, type: !43, flags: DIFlagArtificial | DIFlagObjectPointer)
!37 = distinct !DISubprogram(name: "A", linkageName: "_ZN1AC1Ev", scope: !14, file: !1, line: 2, type: !38, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagArtificial | DIFlagPrototyped, isOptimized: true, unit: !0, declaration: !41, variables: !42)
!38 = !DISubroutineType(types: !39)
!39 = !{null, !40}
!40 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
!41 = !DISubprogram(name: "A", scope: !14, type: !38, isLocal: false, isDefinition: false, flags: DIFlagPublic | DIFlagArtificial | DIFlagPrototyped, isOptimized: true)
!42 = !{!36}
!43 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64)
!44 = !DIExpression(DW_OP_stack_value)
!45 = !DILocation(line: 0, scope: !37, inlinedAt: !46)
!46 = distinct !DILocation(line: 6, column: 8, scope: !32, inlinedAt: !35)
!47 = !DILocalVariable(name: "this", arg: 1, scope: !48, type: !43, flags: DIFlagArtificial | DIFlagObjectPointer)
!48 = distinct !DISubprogram(name: "A", linkageName: "_ZN1AC2Ev", scope: !14, file: !1, line: 2, type: !38, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagArtificial | DIFlagPrototyped, isOptimized: true, unit: !0, declaration: !41, variables: !49)
!49 = !{!47}
!50 = !DILocation(line: 0, scope: !48, inlinedAt: !51)
!51 = distinct !DILocation(line: 2, column: 7, scope: !37, inlinedAt: !46)
!52 = !DILocation(line: 3, column: 7, scope: !48, inlinedAt: !51)
!53 = !{!54, !55, i64 0}
!54 = !{!"_ZTS1A", !55, i64 0, !55, i64 4}
!55 = !{!"int", !56, i64 0}
!56 = !{!"omnipotent char", !57, i64 0}
!57 = !{!"Simple C++ TBAA"}
!58 = !DILocation(line: 4, column: 7, scope: !48, inlinedAt: !51)
!59 = !{!54, !55, i64 4}
!60 = !DILocation(line: 8, column: 7, scope: !32, inlinedAt: !35)
!61 = !{!62, !55, i64 8}
!62 = !{!"_ZTS1B", !54, i64 0, !55, i64 8}
!63 = !DILocation(line: 11, column: 13, scope: !7)