debug.hpp

/*
 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef SHARE_UTILITIES_DEBUG_HPP
#define SHARE_UTILITIES_DEBUG_HPP

#include "utilities/breakpoint.hpp"
#include "utilities/compilerWarnings.hpp"
#include "utilities/macros.hpp"

#include <stddef.h>

// ShowRegistersOnAssert support (for now Linux only)
#if defined(LINUX) && !defined(ZERO)
#define CAN_SHOW_REGISTERS_ON_ASSERT
extern char* g_assert_poison;
#define TOUCH_ASSERT_POISON (*g_assert_poison) = 'X';
void initialize_assert_poison();
void disarm_assert_poison();
bool handle_assert_poison_fault(const void* ucVoid, const void* faulting_address);
#else
#define TOUCH_ASSERT_POISON
#endif // CAN_SHOW_REGISTERS_ON_ASSERT

// assertions
#ifndef ASSERT
#define vmassert(p, ...)
#else
// Note: message says "assert" rather than "vmassert" for backward
// compatibility with tools that parse/match the message text.
// Note: The signature is vmassert(p, format, ...), but the solaris
// compiler can't handle an empty ellipsis in a macro without a warning.
#define vmassert(p, ...)                                                       \
do {                                                                           \
  if (!(p)) {                                                                  \
    TOUCH_ASSERT_POISON;                                                       \
    report_vm_error(__FILE__, __LINE__, "assert(" #p ") failed", __VA_ARGS__); \
    BREAKPOINT;                                                                \
  }                                                                            \
} while (0)
#endif

// For backward compatibility.
#define assert(p, ...) vmassert(p, __VA_ARGS__)

#define precond(p)   assert(p, "precond")
#define postcond(p)  assert(p, "postcond")

#ifndef ASSERT
#define vmassert_status(p, status, msg)
#else
// This version of vmassert is for use with checking return status from
// library calls that return actual error values eg. EINVAL,
// ENOMEM etc, rather than returning -1 and setting errno.
// When the status is not what is expected it is very useful to know
// what status was actually returned, so we pass the status variable as
// an extra arg and use strerror to convert it to a meaningful string
// like "Invalid argument", "out of memory" etc
#define vmassert_status(p, status, msg) \
do {                                                                           \
  if (!(p)) {                                                                  \
    TOUCH_ASSERT_POISON;                                                       \
    report_vm_status_error(__FILE__, __LINE__, "assert(" #p ") failed",        \
                           status, msg);                                       \
    BREAKPOINT;                                                                \
  }                                                                            \
} while (0)
#endif

// For backward compatibility.
#define assert_status(p, status, msg) vmassert_status(p, status, msg)

// guarantee is like vmassert except it's always executed -- use it for
// cheap tests that catch errors that would otherwise be hard to find.
// guarantee is also used for Verify options.
#define guarantee(p, ...)                                                         \
do {                                                                              \
  if (!(p)) {                                                                     \
    TOUCH_ASSERT_POISON;                                                          \
    report_vm_error(__FILE__, __LINE__, "guarantee(" #p ") failed", __VA_ARGS__); \
    BREAKPOINT;                                                                   \
  }                                                                               \
} while (0)

#define fatal(...)                                                                \
do {                                                                              \
  TOUCH_ASSERT_POISON;                                                            \
  report_fatal(INTERNAL_ERROR, __FILE__, __LINE__, __VA_ARGS__);                  \
  BREAKPOINT;                                                                     \
} while (0)

// out of memory
#define vm_exit_out_of_memory(size, vm_err_type, ...)                             \
do {                                                                              \
  report_vm_out_of_memory(__FILE__, __LINE__, size, vm_err_type, __VA_ARGS__);    \
  BREAKPOINT;                                                                     \
} while (0)

#define ShouldNotCallThis()                                                       \
do {                                                                              \
  TOUCH_ASSERT_POISON;                                                            \
  report_should_not_call(__FILE__, __LINE__);                                     \
  BREAKPOINT;                                                                     \
} while (0)

#define ShouldNotReachHere()                                                      \
do {                                                                              \
  TOUCH_ASSERT_POISON;                                                            \
  report_should_not_reach_here(__FILE__, __LINE__);                               \
  BREAKPOINT;                                                                     \
} while (0)

#define Unimplemented()                                                           \
do {                                                                              \
  TOUCH_ASSERT_POISON;                                                            \
  report_unimplemented(__FILE__, __LINE__);                                       \
  BREAKPOINT;                                                                     \
} while (0)

#define Untested(msg)                                                             \
do {                                                                              \
  report_untested(__FILE__, __LINE__, msg);                                       \
  BREAKPOINT;                                                                     \
} while (0);


// types of VM error - originally in vmError.hpp
enum VMErrorType {
  INTERNAL_ERROR   = 0xe0000000,
  OOM_MALLOC_ERROR = 0xe0000001,
  OOM_MMAP_ERROR   = 0xe0000002,
  OOM_MPROTECT_ERROR = 0xe0000003,
  OOM_JAVA_HEAP_FATAL = 0xe0000004
};

// Set to suppress secondary error reporting.
// Really should have a qualified name or something.
extern bool Debugging;

// error reporting helper functions
void report_vm_error(const char* file, int line, const char* error_msg);
void report_vm_error(const char* file, int line, const char* error_msg,
                     const char* detail_fmt, ...) ATTRIBUTE_PRINTF(4, 5);
void report_vm_status_error(const char* file, int line, const char* error_msg,
                            int status, const char* detail);
void report_fatal(VMErrorType error_type, const char* file, int line, const char* detail_fmt, ...) ATTRIBUTE_PRINTF(4, 5);
void report_vm_out_of_memory(const char* file, int line, size_t size, VMErrorType vm_err_type,
                             const char* detail_fmt, ...) ATTRIBUTE_PRINTF(5, 6);
void report_should_not_call(const char* file, int line);
void report_should_not_reach_here(const char* file, int line);
void report_unimplemented(const char* file, int line);
void report_untested(const char* file, int line, const char* message);

void warning(const char* format, ...) ATTRIBUTE_PRINTF(1, 2);

// Compile-time asserts.  Cond must be a compile-time constant expression that
// is convertible to bool.  STATIC_ASSERT() can be used anywhere a declaration
// may appear.
//
// Implementation Note: STATIC_ASSERT_FAILURE<true> provides a value member
// rather than type member that could be used directly in the typedef, because
// a type member would require conditional use of "typename", depending on
// whether Cond is dependent or not.  The use of a value member leads to the
// use of an array type.

template<bool x> struct STATIC_ASSERT_FAILURE;
template<> struct STATIC_ASSERT_FAILURE<true> { enum { value = 1 }; };

#define STATIC_ASSERT(Cond) \
  typedef char PASTE_TOKENS(STATIC_ASSERT_DUMMY_TYPE_, __LINE__)[ \
    STATIC_ASSERT_FAILURE< (Cond) >::value ]

// out of memory reporting
void report_java_out_of_memory(const char* message);

#endif // SHARE_UTILITIES_DEBUG_HPP