40 lines
1.3 KiB
LLVM
40 lines
1.3 KiB
LLVM
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; Test that safestack layout reuses a region w/o fragmentation.
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; RUN: opt -safe-stack -safe-stack-coloring=1 -S -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck %s
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define void @f() safestack {
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; CHECK-LABEL: define void @f
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entry:
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; CHECK: %[[USP:.*]] = load i8*, i8** @__safestack_unsafe_stack_ptr
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; CHECK: getelementptr i8, i8* %[[USP]], i32 -16
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%x0 = alloca i64, align 8
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%x1 = alloca i8, align 1
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%x2 = alloca i64, align 8
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%x0a = bitcast i64* %x0 to i8*
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%x2a = bitcast i64* %x2 to i8*
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call void @llvm.lifetime.start.p0i8(i64 8, i8* %x0a)
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call void @capture64(i64* %x0)
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call void @llvm.lifetime.end.p0i8(i64 8, i8* %x0a)
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call void @llvm.lifetime.start.p0i8(i64 1, i8* %x1)
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call void @llvm.lifetime.start.p0i8(i64 8, i8* %x2a)
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call void @capture8(i8* %x1)
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call void @capture64(i64* %x2)
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call void @llvm.lifetime.end.p0i8(i64 1, i8* %x1)
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call void @llvm.lifetime.end.p0i8(i64 8, i8* %x2a)
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; Test that i64 allocas share space.
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; CHECK: getelementptr i8, i8* %unsafe_stack_ptr, i32 -8
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; CHECK: getelementptr i8, i8* %unsafe_stack_ptr, i32 -9
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; CHECK: getelementptr i8, i8* %unsafe_stack_ptr, i32 -8
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ret void
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}
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declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture)
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declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture)
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declare void @capture8(i8*)
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declare void @capture64(i64*)
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