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8bbe82486b
This is a fix for PR27844. When replacing uses of unsafe allocas, emit the new location immediately after each use. Without this, the pointer stays live from the function entry to the last use, while it's usually cheaper to recalculate. llvm-svn: 272969
91 lines
3.1 KiB
LLVM
91 lines
3.1 KiB
LLVM
; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s
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; RUN: opt -safe-stack -safe-stack-usp-storage=single-thread -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck -check-prefix=SINGLE-THREAD %s
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; RUN: opt -safe-stack -S -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck %s
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; RUN: opt -safe-stack -safe-stack-usp-storage=single-thread -S -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck -check-prefix=SINGLE-THREAD %s
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; array [4 x i8]
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; Requires protector.
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; CHECK: @__safestack_unsafe_stack_ptr = external thread_local(initialexec) global i8*
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; SINGLE-THREAD: @__safestack_unsafe_stack_ptr = external global i8*
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define void @foo(i8* %a) nounwind uwtable safestack {
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entry:
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; CHECK: %[[USP:.*]] = load i8*, i8** @__safestack_unsafe_stack_ptr
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; CHECK: %[[USST:.*]] = getelementptr i8, i8* %[[USP]], i32 -16
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; CHECK: store i8* %[[USST]], i8** @__safestack_unsafe_stack_ptr
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%a.addr = alloca i8*, align 8
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%buf = alloca [4 x i8], align 1
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; CHECK: %[[AADDR:.*]] = alloca i8*, align 8
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; CHECK: store i8* {{.*}}, i8** %[[AADDR]], align 8
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store i8* %a, i8** %a.addr, align 8
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; CHECK: %[[BUFPTR:.*]] = getelementptr i8, i8* %[[USP]], i32 -4
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; CHECK: %[[BUFPTR2:.*]] = bitcast i8* %[[BUFPTR]] to [4 x i8]*
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; CHECK: %[[GEP:.*]] = getelementptr inbounds [4 x i8], [4 x i8]* %[[BUFPTR2]], i32 0, i32 0
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%gep = getelementptr inbounds [4 x i8], [4 x i8]* %buf, i32 0, i32 0
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; CHECK: %[[A2:.*]] = load i8*, i8** %[[AADDR]], align 8
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%a2 = load i8*, i8** %a.addr, align 8
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; CHECK: call i8* @strcpy(i8* %[[GEP]], i8* %[[A2]])
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%call = call i8* @strcpy(i8* %gep, i8* %a2)
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; CHECK: store i8* %[[USP]], i8** @__safestack_unsafe_stack_ptr
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ret void
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}
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; Load from an array at a fixed offset, no overflow.
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define i8 @StaticArrayFixedSafe() nounwind uwtable safestack {
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entry:
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; CHECK-LABEL: define i8 @StaticArrayFixedSafe(
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; CHECK-NOT: __safestack_unsafe_stack_ptr
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; CHECK: ret i8
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%buf = alloca i8, i32 4, align 1
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%gep = getelementptr inbounds i8, i8* %buf, i32 2
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%x = load i8, i8* %gep, align 1
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ret i8 %x
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}
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; Load from an array at a fixed offset with overflow.
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define i8 @StaticArrayFixedUnsafe() nounwind uwtable safestack {
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entry:
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; CHECK-LABEL: define i8 @StaticArrayFixedUnsafe(
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; CHECK: __safestack_unsafe_stack_ptr
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; CHECK: ret i8
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%buf = alloca i8, i32 4, align 1
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%gep = getelementptr inbounds i8, i8* %buf, i32 5
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%x = load i8, i8* %gep, align 1
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ret i8 %x
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}
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; Load from an array at an unknown offset.
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define i8 @StaticArrayVariableUnsafe(i32 %ofs) nounwind uwtable safestack {
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entry:
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; CHECK-LABEL: define i8 @StaticArrayVariableUnsafe(
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; CHECK: __safestack_unsafe_stack_ptr
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; CHECK: ret i8
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%buf = alloca i8, i32 4, align 1
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%gep = getelementptr inbounds i8, i8* %buf, i32 %ofs
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%x = load i8, i8* %gep, align 1
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ret i8 %x
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}
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; Load from an array of an unknown size.
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define i8 @DynamicArrayUnsafe(i32 %sz) nounwind uwtable safestack {
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entry:
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; CHECK-LABEL: define i8 @DynamicArrayUnsafe(
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; CHECK: __safestack_unsafe_stack_ptr
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; CHECK: ret i8
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%buf = alloca i8, i32 %sz, align 1
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%gep = getelementptr inbounds i8, i8* %buf, i32 2
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%x = load i8, i8* %gep, align 1
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ret i8 %x
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}
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declare i8* @strcpy(i8*, i8*)
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