tests/toolchain/dwarf_local_var.c

/*
 * Copyright (c) 2012 The Native Client Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

/* Test that dwarf info for local variables is preserved after linking.
 *
 * This test uses LLVM's FileCheck utility. For more information,
 * please refer to http://llvm.org/docs/CommandGuide/FileCheck.html
 */

#include <stdlib.h>

extern int bar(int x) __attribute__((noinline));

__attribute__((noinline)) int foo(int dwarf_test_param) {
  // CHECK-DAG: DW_TAG_formal_parameter
  // CHECK: DW_AT_name{{.*}} dwarf_test_param
  // CHECK-DAG: DW_AT_decl_line{{.*}} 17
  return bar(dwarf_test_param);
}

int main(int argc, char* argv[]) {
  int dwarf_test_local;
  // CHECK-DAG: DW_TAG_variable
  // CHECK: DW_AT_name{{.*}} dwarf_test_local
  // CHECK-DAG: DW_AT_decl_line{{.*}} 25

  /* Try to trick the optimizer to preserve dwarf_test_local. */
  if (argc != 55) {
    /* This branch should be taken. */
    dwarf_test_local = 55;
  } else if (argc == 54) {
    dwarf_test_local = atoi(argv[1]);
  } else {
    dwarf_test_local = -1;
  }

  if (argc != 54) {
    /* This branch should be taken. */
    return foo(dwarf_test_local);
  } else {
    return -1;
  }
}