From 0644130612d89fab74008d01794cd2eb4b6e5bbe Mon Sep 17 00:00:00 2001 From: Eli Friedman Date: Sat, 21 Apr 2018 00:07:46 +0000 Subject: [AArch64] Don't crash trying to resolve __stack_chk_guard. In certain cases, the compiler might try to merge __stack_chk_guard with another global variable. (Or someone could theoretically define __stack_chk_guard as an alias.) In that case, make sure we don't crash. Differential Revision: https://reviews.llvm.org/D45746 llvm-svn: 330495 --- llvm/test/CodeGen/AArch64/stackguard-internal.ll | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 llvm/test/CodeGen/AArch64/stackguard-internal.ll (limited to 'llvm/test/CodeGen/AArch64/stackguard-internal.ll') diff --git a/llvm/test/CodeGen/AArch64/stackguard-internal.ll b/llvm/test/CodeGen/AArch64/stackguard-internal.ll new file mode 100644 index 00000000000..6dcdf161985 --- /dev/null +++ b/llvm/test/CodeGen/AArch64/stackguard-internal.ll @@ -0,0 +1,21 @@ +; RUN: llc -O3 %s -o - | FileCheck %s +target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128" +target triple = "aarch64-linux-gnu" + +; Make sure we correctly lower stack guards even if __stack_chk_guard +; is an alias. (The alias is created by GlobalMerge.) +; CHECK: adrp {{.*}}, __stack_chk_guard +; CHECK: ldr {{.*}}, [{{.*}}, :lo12:__stack_chk_guard] +; CHECK: .set __stack_chk_guard, .L_MergedGlobals+4 + +@__stack_chk_guard = internal global [8 x i32] zeroinitializer, align 4 +@x = internal global i32 0, align 4 + +define i32 @b() nounwind sspstrong { +entry: + %z = alloca [10 x i32], align 4 + %arraydecay = getelementptr inbounds [10 x i32], [10 x i32]* %z, i64 0, i64 0 + %call = call i32 @a(i32* getelementptr inbounds ([8 x i32], [8 x i32]* @__stack_chk_guard, i64 0, i64 0), i32* nonnull @x, i32* nonnull %arraydecay) #3 + ret i32 %call +} +declare i32 @a(i32*, i32*, i32*) -- cgit v1.2.3