diff options
Diffstat (limited to 'xpcom/glue/nsDebug.h')
| -rw-r--r-- | xpcom/glue/nsDebug.h | 460 |
1 files changed, 460 insertions, 0 deletions
diff --git a/xpcom/glue/nsDebug.h b/xpcom/glue/nsDebug.h new file mode 100644 index 0000000000..7365f9ce34 --- /dev/null +++ b/xpcom/glue/nsDebug.h @@ -0,0 +1,460 @@ +/* -*- 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___ */ |