b7c1a6f8b4
Remove getPrefTypeAlign calls and use only the alloca's explicit alignment, since the type may not be semantically useful, there is no useful reason to change alignment to support it. The alloca's explicit alignment (from getAlign()) is already optimally correct; we don't need to derive alignment from the allocated type. Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>
80 lines
3.4 KiB
LLVM
80 lines
3.4 KiB
LLVM
; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s
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; RUN: opt -passes='require<libcall-lowering-info>,safe-stack' -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s
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; Test debug location for the local variables moved onto the unsafe stack.
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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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%struct.S = type { [100 x i8] }
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; Function Attrs: safestack uwtable
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define void @f(ptr byval(%struct.S) align 8 %zzz) #0 !dbg !12 {
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; CHECK: define void @f
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entry:
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; CHECK: %[[USP:.*]] = load ptr, ptr @__safestack_unsafe_stack_ptr
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%xxx = alloca %struct.S, align 1
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call void @llvm.dbg.declare(metadata ptr %zzz, metadata !18, metadata !19), !dbg !20
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call void @llvm.dbg.declare(metadata ptr %xxx, metadata !21, metadata !19), !dbg !22
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; dbg.declare for %zzz and %xxx are gone; replaced with dbg.declare based off the unsafe stack pointer
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; CHECK-NOT: #dbg_declare
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; CHECK: #dbg_declare(ptr %[[USP]], ![[VAR_ARG:.*]], !DIExpression(DW_OP_constu, 104, DW_OP_minus),
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; CHECK-NOT: #dbg_declare
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; CHECK: #dbg_declare(ptr %[[USP]], ![[VAR_LOCAL:.*]], !DIExpression(DW_OP_constu, 204, DW_OP_minus),
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; CHECK-NOT: #dbg_declare
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call void @Capture(ptr %zzz), !dbg !23
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call void @Capture(ptr %xxx), !dbg !24
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; dbg.declare appears before the first use
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; CHECK: call void @Capture
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; CHECK: call void @Capture
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ret void, !dbg !25
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}
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; CHECK-DAG: ![[VAR_ARG]] = !DILocalVariable(name: "zzz"
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; CHECK-DAG: ![[VAR_LOCAL]] = !DILocalVariable(name: "xxx"
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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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declare void @Capture(ptr)
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attributes #0 = { safestack uwtable }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!15, !16}
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!llvm.ident = !{!17}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 254019) (llvm/trunk 254036)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3)
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!1 = !DIFile(filename: "../llvm/2.cc", directory: "/code/build-llvm")
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!2 = !{}
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!3 = !{!4}
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!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "S", file: !1, line: 4, size: 800, align: 8, elements: !5, identifier: "_ZTS1S")
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!5 = !{!6}
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!6 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !4, file: !1, line: 5, baseType: !7, size: 800, align: 8)
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!7 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 800, align: 8, elements: !9)
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!8 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
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!9 = !{!10}
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!10 = !DISubrange(count: 100)
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!12 = distinct !DISubprogram(name: "f", linkageName: "_Z1f1S", scope: !1, file: !1, line: 10, type: !13, isLocal: false, isDefinition: true, scopeLine: 10, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!13 = !DISubroutineType(types: !14)
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!14 = !{null, !4}
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!15 = !{i32 2, !"Dwarf Version", i32 4}
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!16 = !{i32 2, !"Debug Info Version", i32 3}
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!17 = !{!"clang version 3.8.0 (trunk 254019) (llvm/trunk 254036)"}
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!18 = !DILocalVariable(name: "zzz", arg: 1, scope: !12, file: !1, line: 10, type: !4)
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!19 = !DIExpression()
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!20 = !DILocation(line: 10, column: 10, scope: !12)
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!21 = !DILocalVariable(name: "xxx", scope: !12, file: !1, line: 11, type: !4)
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!22 = !DILocation(line: 11, column: 5, scope: !12)
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!23 = !DILocation(line: 12, column: 3, scope: !12)
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!24 = !DILocation(line: 13, column: 3, scope: !12)
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!25 = !DILocation(line: 14, column: 1, scope: !12)
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