c23b4fbdbb
Now that #149310 has restricted lifetime intrinsics to only work on allocas, we can also drop the explicit size argument. Instead, the size is implied by the alloca. This removes the ability to only mark a prefix of an alloca alive/dead. We never used that capability, so we should remove the need to handle that possibility everywhere (though many key places, including stack coloring, did not actually respect this).
100 lines
5.3 KiB
LLVM
100 lines
5.3 KiB
LLVM
; RUN: opt -safe-stack -safestack-use-pointer-address < %s -S | FileCheck %s
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; RUN: opt -passes=safe-stack -safestack-use-pointer-address < %s -S | FileCheck %s
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "armv7-pc-linux-android"
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; Original C used to generate debug info:
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; char*** addr;
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; char** __safestack_pointer_address() {
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; return *addr;
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; }
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; void Capture(char*x);
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; void f() { char c[16]; Capture(c); }
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; CHECK: !36 = !DILocation(line: 3, column: 11, scope: !17, inlinedAt: !37)
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; CHECK: !37 = distinct !DILocation(line: 6, scope: !27)
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@addr = common local_unnamed_addr global ptr null, align 4, !dbg !0
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; Function Attrs: norecurse nounwind readonly safestack
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define ptr @__safestack_pointer_address() local_unnamed_addr #0 !dbg !17 {
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entry:
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%0 = load ptr, ptr @addr, align 4, !dbg !20, !tbaa !21
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%1 = load ptr, ptr %0, align 4, !dbg !25, !tbaa !21
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ret ptr %1, !dbg !26
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}
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; Function Attrs: nounwind safestack
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define void @f() local_unnamed_addr #1 !dbg !27 {
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entry:
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%c = alloca [16 x i8], align 1
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call void @llvm.lifetime.start.p0(ptr nonnull %c) #5, !dbg !35
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call void @llvm.dbg.declare(metadata ptr %c, metadata !31, metadata !DIExpression()), !dbg !36
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call void @Capture(ptr nonnull %c) #5, !dbg !37
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call void @llvm.lifetime.end.p0(ptr nonnull %c) #5, !dbg !38
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ret void, !dbg !38
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}
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.start.p0(ptr nocapture) #2
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #3
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declare void @Capture(ptr) local_unnamed_addr #4
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.end.p0(ptr nocapture) #2
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attributes #0 = { norecurse nounwind readonly safestack "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="all" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="generic" "target-features"="+armv7-a,+dsp,+neon,+vfp3,-thumb-mode" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind safestack "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="all" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="generic" "target-features"="+armv7-a,+dsp,+neon,+vfp3,-thumb-mode" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #2 = { argmemonly nounwind }
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attributes #3 = { nounwind readnone speculatable }
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attributes #4 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="all" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="generic" "target-features"="+armv7-a,+dsp,+neon,+vfp3,-thumb-mode" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #5 = { nounwind }
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!11, !12, !13, !14, !15}
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!llvm.ident = !{!16}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "addr", scope: !2, file: !6, line: 1, type: !7, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
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!3 = !DIFile(filename: "-", directory: "/")
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!4 = !{}
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!5 = !{!0}
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!6 = !DIFile(filename: "<stdin>", directory: "/")
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!7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 32)
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!8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 32)
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!9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 32)
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!10 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_unsigned_char)
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!11 = !{i32 2, !"Dwarf Version", i32 4}
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!12 = !{i32 2, !"Debug Info Version", i32 3}
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!13 = !{i32 1, !"wchar_size", i32 4}
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!14 = !{i32 1, !"min_enum_size", i32 4}
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!15 = !{i32 7, !"PIC Level", i32 1}
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!16 = !{!"clang"}
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!17 = distinct !DISubprogram(name: "__safestack_pointer_address", scope: !6, file: !6, line: 2, type: !18, isLocal: false, isDefinition: true, scopeLine: 2, isOptimized: true, unit: !2, retainedNodes: !4)
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!18 = !DISubroutineType(types: !19)
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!19 = !{!8}
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!20 = !DILocation(line: 3, column: 11, scope: !17)
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!21 = !{!22, !22, i64 0}
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!22 = !{!"any pointer", !23, i64 0}
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!23 = !{!"omnipotent char", !24, i64 0}
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!24 = !{!"Simple C/C++ TBAA"}
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!25 = !DILocation(line: 3, column: 10, scope: !17)
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!26 = !DILocation(line: 3, column: 3, scope: !17)
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!27 = distinct !DISubprogram(name: "f", scope: !6, file: !6, line: 6, type: !28, isLocal: false, isDefinition: true, scopeLine: 6, isOptimized: true, unit: !2, retainedNodes: !30)
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!28 = !DISubroutineType(types: !29)
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!29 = !{null}
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!30 = !{!31}
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!31 = !DILocalVariable(name: "c", scope: !27, file: !6, line: 6, type: !32)
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!32 = !DICompositeType(tag: DW_TAG_array_type, baseType: !10, size: 128, elements: !33)
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!33 = !{!34}
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!34 = !DISubrange(count: 16)
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!35 = !DILocation(line: 6, column: 12, scope: !27)
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!36 = !DILocation(line: 6, column: 17, scope: !27)
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!37 = !DILocation(line: 6, column: 24, scope: !27)
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!38 = !DILocation(line: 6, column: 36, scope: !27)
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