gecko/tools/trace-malloc/lib/nsTraceMalloc.h
2012-05-21 12:12:37 +01:00

224 lines
7.2 KiB
C

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* 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 nsTraceMalloc_h___
#define nsTraceMalloc_h___
#include "mozilla/StandardInteger.h"
#include <stdio.h> /* for FILE */
#include "prtypes.h"
#ifdef XP_WIN
#define setlinebuf(stream) setvbuf((stream), (char *)NULL, _IOLBF, 0)
#endif
PR_BEGIN_EXTERN_C
/**
* Magic "number" at start of a trace-malloc log file. Inspired by the PNG
* magic string, which inspired XPCOM's typelib (.xpt) file magic. See the
* NS_TraceMallocStartup comment (below) for magic number differences in log
* file structure.
*/
#define NS_TRACE_MALLOC_MAGIC "XPCOM\nTMLog08\r\n\032"
#define NS_TRACE_MALLOC_MAGIC_SIZE 16
/**
* Trace-malloc stats, traced via the 'Z' event at the end of a log file.
*/
typedef struct nsTMStats {
uint32_t calltree_maxstack;
uint32_t calltree_maxdepth;
uint32_t calltree_parents;
uint32_t calltree_maxkids;
uint32_t calltree_kidhits;
uint32_t calltree_kidmisses;
uint32_t calltree_kidsteps;
uint32_t callsite_recurrences;
uint32_t backtrace_calls;
uint32_t backtrace_failures;
uint32_t btmalloc_failures;
uint32_t dladdr_failures;
uint32_t malloc_calls;
uint32_t malloc_failures;
uint32_t calloc_calls;
uint32_t calloc_failures;
uint32_t realloc_calls;
uint32_t realloc_failures;
uint32_t free_calls;
uint32_t null_free_calls;
} nsTMStats;
#define NS_TMSTATS_STATIC_INITIALIZER {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
/**
* Call NS_TraceMallocStartup with a valid file descriptor to enable logging
* of compressed malloc traces, including callsite chains. Integers may be
* unsigned serial numbers, sizes, or offsets, and require at most 32 bits.
* They're encoded as follows:
* 0-127 0xxxxxxx (binary, one byte)
* 128-16383 10xxxxxx xxxxxxxx
* 16384-0x1fffff 110xxxxx xxxxxxxx xxxxxxxx
* 0x200000-0xfffffff 1110xxxx xxxxxxxx xxxxxxxx xxxxxxxx
* 0x10000000-0xffffffff 11110000 xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx
* Strings are NUL-terminated ASCII.
*
* Event Operands (magic TMLog01)
* 'L' library serial, shared object filename string
* 'N' method serial, library serial, demangled name string
* 'S' site serial, parent serial, method serial, calling pc offset
* 'M' site serial, malloc size
* 'C' site serial, calloc size
* 'R' site serial, realloc oldsize, realloc size
* 'F' site serial, free size
*
* Event Operands (magic TMLog02)
* 'Z' serialized struct tmstats (20 unsigned integers),
* maxkids parent callsite serial,
* maxstack top callsite serial
*
* Event Operands (magic TMLog03)
* 'T' seconds, microseconds, caption
*
* Event Operands (magic TMLog04)
* 'R' site serial, realloc size, old site serial, realloc oldsize
*
* Event Operands (magic TMLog05)
* 'M' site serial, address, malloc size
* 'C' site serial, address, calloc size
* 'R' site serial, address, realloc size, old site serial,
* old address, old size
* 'F' site serial, address, free size
*
* Event Operands (magic TMLog06)
* 'M' site serial, interval time (end), address, malloc size
* 'C' site serial, interval time (end), address, calloc size
* 'R' site serial, interval time (end), address, realloc size,
* old site serial, old address, old size
* 'F' site serial, interval time (end), address, free size
*
* Event Operands (magic TMLog07)
* 'M' site serial, interval time (start), duration, address, malloc size
* 'C' site serial, interval time (start), duration, address, calloc size
* 'R' site serial, interval time (start), duration, address, realloc size,
* old site serial, old address, old size
* 'F' site serial, interval time (start), duration, address, free size
*
* Event Operands (magic TMLog08)
* 'G' filename serial, source filename string.
* 'N' method serial, library serial, source filename serial,
* source file linenumber, demangled name string
*
* See tools/trace-malloc/bloatblame.c for an example log-file reader.
*/
#define TM_EVENT_LIBRARY 'L'
#define TM_EVENT_FILENAME 'G'
#define TM_EVENT_METHOD 'N'
#define TM_EVENT_CALLSITE 'S'
#define TM_EVENT_MALLOC 'M'
#define TM_EVENT_CALLOC 'C'
#define TM_EVENT_REALLOC 'R'
#define TM_EVENT_FREE 'F'
#define TM_EVENT_STATS 'Z'
#define TM_EVENT_TIMESTAMP 'T'
PR_EXTERN(void) NS_TraceMallocStartup(int logfd);
/**
* Initialize malloc tracing, using the ``standard'' startup arguments.
*/
PR_EXTERN(int) NS_TraceMallocStartupArgs(int argc, char* argv[]);
/**
* Return PR_TRUE iff |NS_TraceMallocStartup[Args]| has been successfully called.
*/
PR_EXTERN(PRBool) NS_TraceMallocHasStarted(void);
/**
* Stop all malloc tracing, flushing any buffered events to the logfile.
*/
PR_EXTERN(void) NS_TraceMallocShutdown(void);
/**
* Disable malloc tracing.
*/
PR_EXTERN(void) NS_TraceMallocDisable(void);
/**
* Enable malloc tracing.
*/
PR_EXTERN(void) NS_TraceMallocEnable(void);
/**
* Change the log file descriptor, flushing any buffered output to the old
* fd, and writing NS_TRACE_MALLOC_MAGIC to the new file if it is zero length.
* Return the old fd, so the caller can swap open fds. Return -2 on failure,
* which means malloc failure.
*/
PR_EXTERN(int) NS_TraceMallocChangeLogFD(int fd);
/**
* Close the file descriptor fd and forget any bookkeeping associated with it.
* Do nothing if fd is -1.
*/
PR_EXTERN(void) NS_TraceMallocCloseLogFD(int fd);
/**
* Emit a timestamp event with the given caption to the current log file.
*/
PR_EXTERN(void) NS_TraceMallocLogTimestamp(const char *caption);
/**
* Walk the stack, dumping frames in standard form to ofp. If skip is 0,
* exclude the frames for NS_TraceStack and anything it calls to do the walk.
* If skip is less than 0, include -skip such frames. If skip is positive,
* exclude that many frames leading to the call to NS_TraceStack.
*/
PR_EXTERN(void)
NS_TraceStack(int skip, FILE *ofp);
/**
* Dump a human-readable listing of current allocations and their compressed
* stack backtraces to the file named by pathname. Beware this file may have
* very long lines.
*
* Return -1 on error with errno set by the system, 0 on success.
*/
PR_EXTERN(int)
NS_TraceMallocDumpAllocations(const char *pathname);
/**
* Flush all logfile buffers.
*/
PR_EXTERN(void)
NS_TraceMallocFlushLogfiles(void);
/**
* Track all realloc and free calls operating on a given allocation.
*/
PR_EXTERN(void)
NS_TrackAllocation(void* ptr, FILE *ofp);
/* opaque type for API */
typedef struct nsTMStackTraceIDStruct *nsTMStackTraceID;
/**
* Get an identifier for the stack trace of the current thread (to this
* function's callsite) that can be used to print that stack trace later.
*/
PR_EXTERN(nsTMStackTraceID)
NS_TraceMallocGetStackTrace(void);
/**
* Print the stack trace identified.
*/
PR_EXTERN(void)
NS_TraceMallocPrintStackTrace(FILE *ofp, nsTMStackTraceID id);
PR_END_EXTERN_C
#endif /* nsTraceMalloc_h___ */