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).
39 lines
1.3 KiB
LLVM
39 lines
1.3 KiB
LLVM
; 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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; RUN: opt -passes=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 ptr, ptr @__safestack_unsafe_stack_ptr
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; CHECK: getelementptr i8, ptr %[[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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call void @llvm.lifetime.start.p0(ptr %x0)
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call void @capture64(ptr %x0)
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call void @llvm.lifetime.end.p0(ptr %x0)
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call void @llvm.lifetime.start.p0(ptr %x1)
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call void @llvm.lifetime.start.p0(ptr %x2)
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call void @capture8(ptr %x1)
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call void @capture64(ptr %x2)
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call void @llvm.lifetime.end.p0(ptr %x1)
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call void @llvm.lifetime.end.p0(ptr %x2)
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; Test that i64 allocas share space.
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; CHECK: getelementptr i8, ptr %unsafe_stack_ptr, i32 -8
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; CHECK: getelementptr i8, ptr %unsafe_stack_ptr, i32 -9
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; CHECK: getelementptr i8, ptr %unsafe_stack_ptr, i32 -8
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ret void
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}
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declare void @llvm.lifetime.start.p0(ptr nocapture)
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declare void @llvm.lifetime.end.p0(ptr nocapture)
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declare void @capture8(ptr)
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declare void @capture64(ptr)
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