056733d019
Using the proper API automatically sets `__stack_chk_guard` to `dso_local` if `Reloc::Static`. This wasn't strictly necessary until recently when dso_local was no longer implied by `TargetMachine::shouldAssumeDSOLocal` for `__stack_chk_guard`. By using the proper API, we can avoid generating unnecessary GOT relocations. Reviewed By: vitalybuka Differential Revision: https://reviews.llvm.org/D102646
31 lines
1004 B
LLVM
31 lines
1004 B
LLVM
; RUN: opt -safe-stack -S -mtriple=x86_64-unknown < %s -o - | FileCheck %s
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define void @foo() safestack sspreq {
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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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; CHECK: %[[A:.*]] = getelementptr i8, i8* %[[USP]], i32 -8
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; CHECK: %[[StackGuardSlot:.*]] = bitcast i8* %[[A]] to i8**
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; CHECK: %[[StackGuard:.*]] = call i8* @llvm.stackguard()
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; CHECK: store i8* %[[StackGuard]], i8** %[[StackGuardSlot]]
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%a = alloca i8, align 1
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; CHECK: call void @Capture
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call void @Capture(i8* %a)
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; CHECK: %[[B:.*]] = load i8*, i8** %[[StackGuardSlot]]
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; CHECK: %[[COND:.*]] = icmp ne i8* %[[StackGuard]], %[[B]]
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; CHECK: br i1 %[[COND]], {{.*}} !prof
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; CHECK: call void @__stack_chk_fail()
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; CHECK-NEXT: unreachable
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; CHECK: store i8* %[[USP]], i8** @__safestack_unsafe_stack_ptr
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; CHECK-NEXT: ret void
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ret void
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}
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declare void @Capture(i8*)
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