File: stack-clash-protection.c

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// Check the correct function attributes are generated
// RUN: %clang_cc1 -triple x86_64-linux -O0 -S -emit-llvm -o- %s -fstack-clash-protection | FileCheck %s
// RUN: %clang_cc1 -triple s390x-linux-gnu -O0 -S -emit-llvm -o- %s -fstack-clash-protection | FileCheck %s
// RUN: %clang_cc1 -triple powerpc64le-linux-gnu -O0 -S -emit-llvm -o- %s -fstack-clash-protection | FileCheck %s
// RUN: %clang_cc1 -triple powerpc64-linux-gnu -O0 -S -emit-llvm -o- %s -fstack-clash-protection | FileCheck %s

// CHECK: define{{.*}} void @large_stack() #[[A:.*]] {
void large_stack(void) {
  volatile int stack[20000], i;
  for (i = 0; i < sizeof(stack) / sizeof(int); ++i)
    stack[i] = i;
}

// CHECK: define{{.*}} void @vla({{.*}}) #[[A:.*]] {
void vla(int n) {
  volatile int vla[n];
  __builtin_memset(&vla[0], 0, 1);
}

// CHECK: define{{.*}} void @builtin_alloca({{.*}}) #[[A:.*]] {
void builtin_alloca(int n) {
  volatile void *mem = __builtin_alloca(n);
}

// CHECK: attributes #[[A]] = {{.*}} "probe-stack"="inline-asm"