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
4.9 KiB
LLVM
100 lines
4.9 KiB
LLVM
; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s
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; RUN: opt -passes=safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s
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; Test llvm.dbg.value for the local variables moved onto the unsafe stack.
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; SafeStack rewrites them relative to the unsafe stack pointer (base address of
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; the unsafe stack frame).
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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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; Function Attrs: noinline safestack uwtable
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define void @f() #0 !dbg !6 {
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entry:
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; CHECK: %[[USP:.*]] = load ptr, ptr @__safestack_unsafe_stack_ptr
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%x1 = alloca i32, align 4
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%x2 = alloca i32, align 4
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; Unhandled dbg.value: expression does not start with OP_DW_deref
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; CHECK: #dbg_value(ptr poison, !{{.*}}, !{{.*}})
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tail call void @llvm.dbg.value(metadata ptr %x1, metadata !10, metadata !23), !dbg !16
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; Unhandled dbg.value: expression does not start with OP_DW_deref
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; CHECK: #dbg_value(ptr poison, !{{.*}}, !{{.*}})
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tail call void @llvm.dbg.value(metadata ptr %x1, metadata !10, metadata !24), !dbg !16
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; Supported dbg.value: rewritted based on the [[USP]] value.
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; CHECK: #dbg_value(ptr %[[USP]], ![[X1:.*]], !DIExpression(DW_OP_constu, 4, DW_OP_minus, DW_OP_deref, DW_OP_LLVM_fragment, 0, 4),
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tail call void @llvm.dbg.value(metadata ptr %x1, metadata !10, metadata !25), !dbg !16
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; Supported dbg.value: rewritted based on the [[USP]] value.
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; CHECK: #dbg_value(ptr %[[USP]], ![[X1:.*]], !DIExpression(DW_OP_constu, 4, DW_OP_minus, DW_OP_deref),
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tail call void @llvm.dbg.value(metadata ptr %x1, metadata !10, metadata !15), !dbg !16
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call void @capture(ptr nonnull %x1), !dbg !17
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; An extra non-dbg.value metadata use of %x2. Replaced with poison.
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; CHECK: call void @llvm.random.metadata.use(metadata ptr poison
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call void @llvm.random.metadata.use(metadata ptr %x2)
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; CHECK: #dbg_value(ptr %[[USP]], ![[X2:.*]], !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref),
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call void @llvm.dbg.value(metadata ptr %x2, metadata !12, metadata !15), !dbg !18
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call void @capture(ptr nonnull %x2), !dbg !19
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ret void, !dbg !20
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}
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.start.p0(ptr nocapture) #1
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declare void @capture(ptr) #2
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.end.p0(ptr nocapture) #1
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, metadata, metadata) #3
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declare void @llvm.random.metadata.use(metadata)
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attributes #0 = { noinline safestack uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { argmemonly nounwind }
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attributes #2 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #3 = { nounwind readnone }
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attributes #4 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!llvm.ident = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.9.0 (trunk 271022) (llvm/trunk 271027)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "../llvm/2.cc", directory: "/code/build-llvm")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{!"clang version 3.9.0 (trunk 271022) (llvm/trunk 271027)"}
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!6 = distinct !DISubprogram(name: "f", linkageName: "_Z1fv", scope: !1, file: !1, line: 4, type: !7, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !9)
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!7 = !DISubroutineType(types: !8)
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!8 = !{null}
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!9 = !{!10, !12}
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; CHECK-DAG: ![[X1]] = !DILocalVariable(name: "x1",
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!10 = !DILocalVariable(name: "x1", scope: !6, file: !1, line: 5, type: !11)
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!11 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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; CHECK-DAG: ![[X2]] = !DILocalVariable(name: "x2",
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!12 = !DILocalVariable(name: "x2", scope: !6, file: !1, line: 6, type: !11)
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!13 = !DILocation(line: 5, column: 3, scope: !6)
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!14 = !DILocation(line: 6, column: 3, scope: !6)
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!15 = !DIExpression(DW_OP_deref)
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!16 = !DILocation(line: 5, column: 7, scope: !6)
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!17 = !DILocation(line: 8, column: 3, scope: !6)
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!18 = !DILocation(line: 6, column: 7, scope: !6)
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!19 = !DILocation(line: 9, column: 3, scope: !6)
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!20 = !DILocation(line: 10, column: 1, scope: !6)
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!21 = !DILocation(line: 10, column: 1, scope: !22)
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!22 = !DILexicalBlockFile(scope: !6, file: !1, discriminator: 1)
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!23 = !DIExpression()
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!24 = !DIExpression(DW_OP_constu, 42, DW_OP_minus)
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!25 = !DIExpression(DW_OP_deref, DW_OP_LLVM_fragment, 0, 4)
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