clang/test/CodeGen/bounds-checking.c

// RUN: %clang_cc1 -fsanitize=local-bounds -emit-llvm -triple x86_64-apple-darwin10 %s -o - | FileCheck %s
// RUN: %clang_cc1 -fsanitize=local-bounds -fexperimental-new-pass-manager -emit-llvm -triple x86_64-apple-darwin10 %s -o - | FileCheck %s
// RUN: %clang_cc1 -fsanitize=array-bounds -O -fsanitize-trap=array-bounds -emit-llvm -triple x86_64-apple-darwin10 -DNO_DYNAMIC %s -o - | FileCheck %s --check-prefixes=CHECK,NONLOCAL
// RUN: %clang_cc1 -fsanitize=array-bounds -O -fsanitize-trap=array-bounds -fexperimental-new-pass-manager -emit-llvm -triple x86_64-apple-darwin10 -DNO_DYNAMIC %s -o - | FileCheck %s --check-prefixes=CHECK,NONLOCAL
//
// REQUIRES: x86-registered-target

// CHECK-LABEL: @f
double f(int b, int i) {
  double a[b];
  // CHECK: call {{.*}} @llvm.{{(ubsan)?trap}}
  return a[i];
}

// CHECK-LABEL: @f2
void f2() {
  // everything is constant; no trap possible
  // CHECK-NOT: call {{.*}} @llvm.{{(ubsan)?trap}}
  int a[2];
  a[1] = 42;

#ifndef NO_DYNAMIC
  short *b = malloc(64);
  b[5] = *a + a[1] + 2;
#endif
}

// CHECK-LABEL: @f3
void f3() {
  int a[1];
  // CHECK: call {{.*}} @llvm.{{(ubsan)?trap}}
  a[2] = 1;
}

union U { int a[0]; int b[1]; int c[2]; };

// CHECK-LABEL: define {{.*}} @f4
int f4(union U *u, int i) {
  // a and b are treated as flexible array members.
  // CHECK-NOT: @llvm.ubsantrap
  return u->a[i] + u->b[i];
  // CHECK: }
}

// CHECK-LABEL: define {{.*}} @f5
int f5(union U *u, int i) {
  // c is not a flexible array member.
  // NONLOCAL: call {{.*}} @llvm.ubsantrap
  return u->c[i];
  // CHECK: }
}