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gecko-dev/xpcom/glue/nsDebug.h

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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 "prprf.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(0)
#else
#define NS_WARNING_ASSERTION(_expr, _msg) do { /* nothing */ } while(0)
#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
/**
* NS_PRECONDITION/POSTCONDITION are synonyms for NS_ASSERTION.
*/
#define NS_PRECONDITION(expr, str) NS_ASSERTION(expr, str)
#define NS_POSTCONDITION(expr, str) NS_ASSERTION(expr, str)
/**
* This macros triggers a program failure if executed. It indicates that
* an attempt was made to execute some unimplemented functionality.
*/
#ifdef DEBUG
#define NS_NOTYETIMPLEMENTED(str) \
do { \
NS_DebugBreak(NS_DEBUG_ASSERTION, str, "NotYetImplemented", __FILE__, __LINE__); \
MOZ_PretendNoReturn(); \
} while(0)
#else
#define NS_NOTYETIMPLEMENTED(str) do { /* nothing */ } while(0)
#endif
/**
* This macros triggers a program failure if executed. It indicates that
* an attempt was made to execute a codepath which should not be reachable.
*/
#ifdef DEBUG
#define NS_NOTREACHED(str) \
do { \
NS_DebugBreak(NS_DEBUG_ASSERTION, str, "Not Reached", __FILE__, __LINE__); \
MOZ_PretendNoReturn(); \
} while(0)
#else
#define NS_NOTREACHED(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 an debug-only abort.
*
* @see NS_RUNTIMEABORT for release-mode asserts.
*/
#ifdef DEBUG
#define NS_ABORT() \
do { \
NS_DebugBreak(NS_DEBUG_ABORT, nullptr, nullptr, __FILE__, __LINE__); \
MOZ_PretendNoReturn(); \
} while(0)
#else
#define NS_ABORT() 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(0)
#define STATIC_ASSERT_RUNTIME(COND) \
do { \
__attribute__((assert_static_runtime(#COND), unused)) \
int STATIC_PASTE1(assert_static_runtime_, __COUNTER__); \
} while(0)
#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(0)
#define STATIC_ASSERT_RUNTIME(COND) do { /* nothing */ } while(0)
#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.
******************************************************************************/
/**
* Terminate execution <i>immediately</i>, and if possible on the current
* platform, in such a way that execution can't be continued by other
* code (e.g., by intercepting a signal).
*/
#define NS_RUNTIMEABORT(msg) \
NS_DebugBreak(NS_DEBUG_ABORT, msg, nullptr, __FILE__, __LINE__)
/* 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(0)
#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(0)
#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) \
char *msg = PR_smprintf("NS_ENSURE_SUCCESS(%s, %s) failed with " \
"result 0x%X", #res, #ret, __rv); \
NS_WARNING(msg); \
PR_smprintf_free(msg);
#define NS_ENSURE_SUCCESS_BODY_VOID(res) \
char *msg = PR_smprintf("NS_ENSURE_SUCCESS_VOID(%s) failed with " \
"result 0x%X", #res, __rv); \
NS_WARNING(msg); \
PR_smprintf_free(msg);
#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(0)
#define NS_ENSURE_SUCCESS_VOID(res) \
do { \
nsresult __rv = res; \
if (NS_FAILED(__rv)) { \
NS_ENSURE_SUCCESS_BODY_VOID(res) \
return; \
} \
} while(0)
/******************************************************************************
** 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 XPCOM_GLUE
#define NS_CheckThreadSafe(owningThread, msg)
#else
#define NS_CheckThreadSafe(owningThread, msg) \
if (MOZ_UNLIKELY(owningThread != PR_GetCurrentThread())) { \
MOZ_CRASH(msg); \
}
#endif
#ifdef MOZILLA_INTERNAL_API
void NS_ABORT_OOM(size_t aSize);
#else
inline void NS_ABORT_OOM(size_t)
{
MOZ_CRASH();
}
#endif
typedef void (*StderrCallback)(const char* aFmt, va_list aArgs);
/* 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:
* - it calls the callback set through set_stderr_callback
* - 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);
/**
* 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);
// used by the profiler to log stderr in the profiler for more
// advanced performance debugging and display/layers visualization.
void set_stderr_callback(StderrCallback aCallback);
#if defined(ANDROID) && !defined(RELEASE_OR_BETA)
// Call this if you want a copy of stderr logging sent to a file. This is
// useful to get around logcat overflow problems on android devices, which use
// a circular logcat buffer and can intermittently drop messages if there's too
// much spew.
//
// This is intended for local debugging only, DO NOT USE IN PRODUCTION CODE.
// (This is ifndef RELEASE_OR_BETA to catch uses of it that accidentally get
// checked in). Using this will also prevent the profiler from getting a copy of
// the stderr messages which it uses for various visualization features.
//
// This function can be called from any thread, but if it is called multiple
// times all invocations must be on the same thread. Invocations after the
// first one are ignored, so you can safely put it inside a loop, for example.
// Once this is called there is no way to turn it off; all stderr output from
// that point forward will go to the file. Note that the output is subject to
// buffering so make sure you have enough output to flush the messages you care
// about before you terminate the process.
//
// The file passed in should be writable, so on Android devices a path like
// "/data/local/tmp/blah" is a good one to use as it is world-writable and will
// work even in B2G child processes which have reduced privileges. Note that the
// actual file created will have the PID appended to the path you pass in, so
// that on B2G the output from each process goes to a separate file.
void copy_stderr_to_file(const char* aFile);
#endif
#ifdef __cplusplus
}
#endif
#endif /* nsDebug_h___ */
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