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gecko-dev/xpcom/base/nsDebug.h

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14 KiB
C
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsDebug_h___
#define nsDebug_h___
#include "nscore.h"
#include "nsError.h"
#include "nsXPCOM.h"
#include "mozilla/Assertions.h"
#include "mozilla/Likely.h"
#include <stdarg.h>
#ifdef DEBUG
#include "mozilla/IntegerPrintfMacros.h"
#include "mozilla/Printf.h"
#endif
/**
* Warn if the given condition is true. The condition is evaluated in both
* release and debug builds, and the result is an expression which can be
* used in subsequent expressions, such as:
*
* if (NS_WARN_IF(NS_FAILED(rv)) {
* return rv;
* }
*
* This explicit warning and return is preferred to the NS_ENSURE_* macros
* which hide the warning and the return control flow.
*
* This macro can also be used outside of conditions just to issue a warning,
* like so:
*
* Unused << NS_WARN_IF(NS_FAILED(FnWithSideEffects());
*
* (The |Unused <<| is necessary because of the MOZ_MUST_USE annotation.)
*
* However, note that the argument to this macro is evaluated in all builds. If
* you just want a warning assertion, it is better to use NS_WARNING_ASSERTION
* (which evaluates the condition only in debug builds) like so:
*
* NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "operation failed");
*
* @note This is C++-only
*/
#ifdef __cplusplus
#ifdef DEBUG
inline MOZ_MUST_USE bool NS_warn_if_impl(bool aCondition, const char* aExpr,
const char* aFile, int32_t aLine)
{
if (MOZ_UNLIKELY(aCondition)) {
NS_DebugBreak(NS_DEBUG_WARNING, nullptr, aExpr, aFile, aLine);
}
return aCondition;
}
#define NS_WARN_IF(condition) \
NS_warn_if_impl(condition, #condition, __FILE__, __LINE__)
#else
#define NS_WARN_IF(condition) (bool)(condition)
#endif
#endif
/**
* Test an assertion for truth. If the expression is not true then
* emit a warning.
*
* Program execution continues past the usage of this macro.
*
* Note also that the non-debug version of this macro does <b>not</b>
* evaluate the message argument.
*/
#ifdef DEBUG
#define NS_WARNING_ASSERTION(_expr, _msg) \
do { \
if (!(_expr)) { \
NS_DebugBreak(NS_DEBUG_WARNING, _msg, #_expr, __FILE__, __LINE__); \
} \
} while(false)
#else
#define NS_WARNING_ASSERTION(_expr, _msg) do { /* nothing */ } while(false)
#endif
/**
* Test an assertion for truth. If the expression is not true then
* trigger a program failure.
*
* Note that the non-debug version of this macro does <b>not</b>
* evaluate the message argument.
*/
#ifdef DEBUG
inline void MOZ_PretendNoReturn()
MOZ_PRETEND_NORETURN_FOR_STATIC_ANALYSIS {}
#define NS_ASSERTION(expr, str) \
do { \
if (!(expr)) { \
NS_DebugBreak(NS_DEBUG_ASSERTION, str, #expr, __FILE__, __LINE__); \
MOZ_PretendNoReturn(); \
} \
} while(0)
#else
#define NS_ASSERTION(expr, str) do { /* nothing */ } while(0)
#endif
/**
* Log an error message.
*/
#ifdef DEBUG
#define NS_ERROR(str) \
do { \
NS_DebugBreak(NS_DEBUG_ASSERTION, str, "Error", __FILE__, __LINE__); \
MOZ_PretendNoReturn(); \
} while(0)
#else
#define NS_ERROR(str) do { /* nothing */ } while(0)
#endif
/**
* Log a warning message.
*/
#ifdef DEBUG
#define NS_WARNING(str) \
NS_DebugBreak(NS_DEBUG_WARNING, str, nullptr, __FILE__, __LINE__)
#else
#define NS_WARNING(str) do { /* nothing */ } while(0)
#endif
/**
* Trigger a debugger breakpoint, only in debug builds.
*/
#ifdef DEBUG
#define NS_BREAK() \
do { \
NS_DebugBreak(NS_DEBUG_BREAK, nullptr, nullptr, __FILE__, __LINE__); \
MOZ_PretendNoReturn(); \
} while(0)
#else
#define NS_BREAK() do { /* nothing */ } while(0)
#endif
/******************************************************************************
** Macros for static assertions. These are used by the sixgill tool.
** When the tool is not running these macros are no-ops.
******************************************************************************/
/* Avoid name collision if included with other headers defining annotations. */
#ifndef HAVE_STATIC_ANNOTATIONS
#define HAVE_STATIC_ANNOTATIONS
#ifdef XGILL_PLUGIN
#define STATIC_PRECONDITION(COND) __attribute__((precondition(#COND)))
#define STATIC_PRECONDITION_ASSUME(COND) __attribute__((precondition_assume(#COND)))
#define STATIC_POSTCONDITION(COND) __attribute__((postcondition(#COND)))
#define STATIC_POSTCONDITION_ASSUME(COND) __attribute__((postcondition_assume(#COND)))
#define STATIC_INVARIANT(COND) __attribute__((invariant(#COND)))
#define STATIC_INVARIANT_ASSUME(COND) __attribute__((invariant_assume(#COND)))
/* Used to make identifiers for assert/assume annotations in a function. */
#define STATIC_PASTE2(X,Y) X ## Y
#define STATIC_PASTE1(X,Y) STATIC_PASTE2(X,Y)
#define STATIC_ASSUME(COND) \
do { \
__attribute__((assume_static(#COND), unused)) \
int STATIC_PASTE1(assume_static_, __COUNTER__); \
} while(false)
#define STATIC_ASSERT_RUNTIME(COND) \
do { \
__attribute__((assert_static_runtime(#COND), unused)) \
int STATIC_PASTE1(assert_static_runtime_, __COUNTER__); \
} while(false)
#else /* XGILL_PLUGIN */
#define STATIC_PRECONDITION(COND) /* nothing */
#define STATIC_PRECONDITION_ASSUME(COND) /* nothing */
#define STATIC_POSTCONDITION(COND) /* nothing */
#define STATIC_POSTCONDITION_ASSUME(COND) /* nothing */
#define STATIC_INVARIANT(COND) /* nothing */
#define STATIC_INVARIANT_ASSUME(COND) /* nothing */
#define STATIC_ASSUME(COND) do { /* nothing */ } while(false)
#define STATIC_ASSERT_RUNTIME(COND) do { /* nothing */ } while(false)
#endif /* XGILL_PLUGIN */
#define STATIC_SKIP_INFERENCE STATIC_INVARIANT(skip_inference())
#endif /* HAVE_STATIC_ANNOTATIONS */
/******************************************************************************
** Macros for terminating execution when an unrecoverable condition is
** reached. These need to be compiled regardless of the DEBUG flag.
******************************************************************************/
/* Macros for checking the trueness of an expression passed in within an
* interface implementation. These need to be compiled regardless of the
* DEBUG flag. New code should use NS_WARN_IF(condition) instead!
* @status deprecated
*/
#define NS_ENSURE_TRUE(x, ret) \
do { \
if (MOZ_UNLIKELY(!(x))) { \
NS_WARNING("NS_ENSURE_TRUE(" #x ") failed"); \
return ret; \
} \
} while(false)
#define NS_ENSURE_FALSE(x, ret) \
NS_ENSURE_TRUE(!(x), ret)
#define NS_ENSURE_TRUE_VOID(x) \
do { \
if (MOZ_UNLIKELY(!(x))) { \
NS_WARNING("NS_ENSURE_TRUE(" #x ") failed"); \
return; \
} \
} while(false)
#define NS_ENSURE_FALSE_VOID(x) \
NS_ENSURE_TRUE_VOID(!(x))
/******************************************************************************
** Macros for checking results
******************************************************************************/
#if defined(DEBUG) && !defined(XPCOM_GLUE_AVOID_NSPR)
#define NS_ENSURE_SUCCESS_BODY(res, ret) \
mozilla::SmprintfPointer msg = mozilla::Smprintf("NS_ENSURE_SUCCESS(%s, %s) failed with " \
"result 0x%" PRIX32, #res, #ret, \
static_cast<uint32_t>(__rv)); \
NS_WARNING(msg.get());
#define NS_ENSURE_SUCCESS_BODY_VOID(res) \
mozilla::SmprintfPointer msg = mozilla::Smprintf("NS_ENSURE_SUCCESS_VOID(%s) failed with " \
"result 0x%" PRIX32, #res, \
static_cast<uint32_t>(__rv)); \
NS_WARNING(msg.get());
#else
#define NS_ENSURE_SUCCESS_BODY(res, ret) \
NS_WARNING("NS_ENSURE_SUCCESS(" #res ", " #ret ") failed");
#define NS_ENSURE_SUCCESS_BODY_VOID(res) \
NS_WARNING("NS_ENSURE_SUCCESS_VOID(" #res ") failed");
#endif
#define NS_ENSURE_SUCCESS(res, ret) \
do { \
nsresult __rv = res; /* Don't evaluate |res| more than once */ \
if (NS_FAILED(__rv)) { \
NS_ENSURE_SUCCESS_BODY(res, ret) \
return ret; \
} \
} while(false)
#define NS_ENSURE_SUCCESS_VOID(res) \
do { \
nsresult __rv = res; \
if (NS_FAILED(__rv)) { \
NS_ENSURE_SUCCESS_BODY_VOID(res) \
return; \
} \
} while(false)
/******************************************************************************
** Macros for checking state and arguments upon entering interface boundaries
******************************************************************************/
#define NS_ENSURE_ARG(arg) \
NS_ENSURE_TRUE(arg, NS_ERROR_INVALID_ARG)
#define NS_ENSURE_ARG_POINTER(arg) \
NS_ENSURE_TRUE(arg, NS_ERROR_INVALID_POINTER)
#define NS_ENSURE_ARG_MIN(arg, min) \
NS_ENSURE_TRUE((arg) >= min, NS_ERROR_INVALID_ARG)
#define NS_ENSURE_ARG_MAX(arg, max) \
NS_ENSURE_TRUE((arg) <= max, NS_ERROR_INVALID_ARG)
#define NS_ENSURE_ARG_RANGE(arg, min, max) \
NS_ENSURE_TRUE(((arg) >= min) && ((arg) <= max), NS_ERROR_INVALID_ARG)
#define NS_ENSURE_STATE(state) \
NS_ENSURE_TRUE(state, NS_ERROR_UNEXPECTED)
#define NS_ENSURE_NO_AGGREGATION(outer) \
NS_ENSURE_FALSE(outer, NS_ERROR_NO_AGGREGATION)
/*****************************************************************************/
#if (defined(DEBUG) || (defined(NIGHTLY_BUILD) && !defined(MOZ_PROFILING))) && !defined(XPCOM_GLUE_AVOID_NSPR)
#define MOZ_THREAD_SAFETY_OWNERSHIP_CHECKS_SUPPORTED 1
#endif
#ifdef MOZILLA_INTERNAL_API
void NS_ABORT_OOM(size_t aSize);
#else
inline void NS_ABORT_OOM(size_t)
{
MOZ_CRASH();
}
#endif
/* When compiling the XPCOM Glue on Windows, we pretend that it's going to
* be linked with a static CRT (-MT) even when it's not. This means that we
* cannot link to data exports from the CRT, only function exports. So,
* instead of referencing "stderr" directly, use fdopen.
*/
#ifdef __cplusplus
extern "C" {
#endif
/**
* printf_stderr(...) is much like fprintf(stderr, ...), except that:
* - on Android and Firefox OS, *instead* of printing to stderr, it
* prints to logcat. (Newlines in the string lead to multiple lines
* of logcat, but each function call implicitly completes a line even
* if the string does not end with a newline.)
* - on Windows, if a debugger is present, it calls OutputDebugString
* in *addition* to writing to stderr
*/
void printf_stderr(const char* aFmt, ...) MOZ_FORMAT_PRINTF(1, 2);
/**
* Same as printf_stderr, but taking va_list instead of varargs
*/
void vprintf_stderr(const char* aFmt, va_list aArgs) MOZ_FORMAT_PRINTF(1, 0);
/**
* fprintf_stderr is like fprintf, except that if its file argument
* is stderr, it invokes printf_stderr instead.
*
* This is useful for general debugging code that logs information to a
* file, but that you would like to be useful on Android and Firefox OS.
* If you use fprintf_stderr instead of fprintf in such debugging code,
* then callers can pass stderr to get logging that works on Android and
* Firefox OS (and also the other side-effects of using printf_stderr).
*
* Code that is structured this way needs to be careful not to split a
* line of output across multiple calls to fprintf_stderr, since doing
* so will cause it to appear in multiple lines in logcat output.
* (Producing multiple lines at once is fine.)
*/
void fprintf_stderr(FILE* aFile, const char* aFmt, ...) MOZ_FORMAT_PRINTF(2, 3);
#ifdef __cplusplus
}
#endif
#endif /* nsDebug_h___ */
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