/*
* Copyright (c) 1999, 2018, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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.
*/
#include "debug_util.h"
static void JNICALL DTrace_PrintStdErr(const char *msg);
#if defined(DEBUG)
enum {
MAX_TRACES = 200, /* max number of defined trace points allowed */
MAX_TRACE_BUFFER = 512, /* maximum size of a given trace output */
MAX_LINE = 100000, /* reasonable upper limit on line number in source file */
MAX_ARGC = 8 /* maximum number of arguments to print functions */
};
typedef enum dtrace_scope {
DTRACE_FILE,
DTRACE_LINE
} dtrace_scope;
typedef struct dtrace_info {
char file[FILENAME_MAX+1];
int line;
int enabled;
dtrace_scope scope;
} dtrace_info, * p_dtrace_info;
static dtrace_info DTraceInfo[MAX_TRACES];
static char DTraceBuffer[MAX_TRACE_BUFFER*2+1]; /* double the buffer size to catch overruns */
static dmutex_t DTraceMutex = NULL;
static dbool_t GlobalTracingEnabled = FALSE;
static int NumTraces = 0;
static DTRACE_OUTPUT_CALLBACK PfnTraceCallback = DTrace_PrintStdErr;
static p_dtrace_info DTrace_GetInfo(dtrace_id tid) {
DASSERT(tid < MAX_TRACES);
return &DTraceInfo[tid];
}
static dtrace_id DTrace_CreateTraceId(const char * file, int line, dtrace_scope scope) {
dtrace_id tid = NumTraces++;
p_dtrace_info info = &DTraceInfo[tid];
DASSERT(NumTraces < MAX_TRACES);
strcpy(info->file, file);
info->line = line;
info->enabled = FALSE;
info->scope = scope;
return tid;
}
/*
* Compares the trailing characters in a filename to see if they match
* e.g. "src\win32\foobar.c" and "foobar.c" would be considered equal
* but "src\win32\foo.c" and "src\win32\bar.c" would not.
*/
static dbool_t FileNamesSame(const char * fileOne, const char * fileTwo) {
size_t lengthOne = strlen(fileOne);
size_t lengthTwo = strlen(fileTwo);
size_t numCompareChars;
dbool_t tailsEqual;
if (fileOne == fileTwo) {
return TRUE;
} else if (fileOne == NULL || fileTwo == NULL) {
return FALSE;
}
/* compare the tail ends of the strings for equality */
numCompareChars = lengthOne < lengthTwo ? lengthOne : lengthTwo;
tailsEqual = strcmp(fileOne + lengthOne - numCompareChars,
fileTwo + lengthTwo - numCompareChars) == 0;
return tailsEqual;
}
/*
* Finds the trace id for a given file/line location or creates one
* if it doesn't exist
*/
static dtrace_id DTrace_GetTraceId(const char * file, int line, dtrace_scope scope) {
dtrace_id tid;
p_dtrace_info info;
/* check to see if the trace point has already been created */
for ( tid = 0; tid < NumTraces; tid++ ) {
info = DTrace_GetInfo(tid);
if ( info->scope == scope ) {
dbool_t sameFile = FileNamesSame(file, info->file);
dbool_t sameLine = info->line == line;
if ( (info->scope == DTRACE_FILE && sameFile) ||
(info->scope == DTRACE_LINE && sameFile && sameLine) ) {
goto Exit;
}
}
}
/* trace point wasn't created, so force it's creation */
tid = DTrace_CreateTraceId(file, line, scope);
Exit:
return tid;
}
static dbool_t DTrace_IsEnabledAt(dtrace_id * pfileid, dtrace_id * plineid, const char * file, int line) {
DASSERT(pfileid != NULL && plineid != NULL);
if ( *pfileid == UNDEFINED_TRACE_ID ) {
/* first time calling the trace for this file, so obtain a trace id */
*pfileid = DTrace_GetTraceId(file, -1, DTRACE_FILE);
}
if ( *plineid == UNDEFINED_TRACE_ID ) {
/* first time calling the trace for this line, so obtain a trace id */
*plineid = DTrace_GetTraceId(file, line, DTRACE_LINE);
}
return GlobalTracingEnabled || DTraceInfo[*pfileid].enabled || DTraceInfo[*plineid].enabled;
}
/*
* Initialize trace functionality. This MUST BE CALLED before any
* tracing function is called.
*/
void DTrace_Initialize() {
DTraceMutex = DMutex_Create();
}
/*
* Cleans up tracing system. Should be called when tracing functionality
* is no longer needed.
*/
void DTrace_Shutdown() {
DMutex_Destroy(DTraceMutex);
}
void DTrace_DisableMutex() {
DTraceMutex = NULL;
}
/*
* Enable tracing for all modules.
*/
void DTrace_EnableAll(dbool_t enabled) {
DMutex_Enter(DTraceMutex);
GlobalTracingEnabled = enabled;
DMutex_Exit(DTraceMutex);
}
/*
* Enable tracing for a specific module. Filename may
* be fully or partially qualified.
* e.g. awt_Component.cpp
* or
* src\win32\native\sun\windows\awt_Component.cpp
*/
void DTrace_EnableFile(const char * file, dbool_t enabled) {
dtrace_id tid;
p_dtrace_info info;
DASSERT(file != NULL);
DMutex_Enter(DTraceMutex);
tid = DTrace_GetTraceId(file, -1, DTRACE_FILE);
info = DTrace_GetInfo(tid);
info->enabled = enabled;
DMutex_Exit(DTraceMutex);
}
/*
* Enable tracing for a specific line in a specific module.
* See comments above regarding filename argument.
*/
void DTrace_EnableLine(const char * file, int line, dbool_t enabled) {
dtrace_id tid;
p_dtrace_info info;
DASSERT(file != NULL && (line > 0 && line < MAX_LINE));
DMutex_Enter(DTraceMutex);
tid = DTrace_GetTraceId(file, line, DTRACE_LINE);
info = DTrace_GetInfo(tid);
info->enabled = enabled;
DMutex_Exit(DTraceMutex);
}
static void DTrace_ClientPrint(const char * msg) {
DASSERT(msg != NULL && PfnTraceCallback != NULL);
(*PfnTraceCallback)(msg);
}
/*
* Print implementation for the use of client defined trace macros. Unsynchronized so it must
* be used from within a DTRACE_PRINT_CALLBACK function.
*/
void DTrace_VPrintImpl(const char * fmt, va_list arglist) {
DASSERT(fmt != NULL);
/* format the trace message */
vsprintf(DTraceBuffer, fmt, arglist);
/* not a real great overflow check (memory would already be hammered) but better than nothing */
DASSERT(strlen(DTraceBuffer) < MAX_TRACE_BUFFER);
/* output the trace message */
DTrace_ClientPrint(DTraceBuffer);
}
/*
* Print implementation for the use of client defined trace macros. Unsynchronized so it must
* be used from within a DTRACE_PRINT_CALLBACK function.
*/
void DTrace_PrintImpl(const char * fmt, ...) {
va_list arglist;
va_start(arglist, fmt);
DTrace_VPrintImpl(fmt, arglist);
va_end(arglist);
}
/*
* Called via DTRACE_PRINT macro. Outputs printf style formatted text.
* JNIEXPORT because these functions are also called from libawt_xawt.
*/
JNIEXPORT void JNICALL
DTrace_VPrint( const char * file, int line, int argc, const char * fmt, va_list arglist ) {
DASSERT(fmt != NULL);
DTrace_VPrintImpl(fmt, arglist);
}
/*
* Called via DTRACE_PRINTLN macro. Outputs printf style formatted text with an automatic newline.
* JNIEXPORT because these functions are also called from libawt_xawt.
*/
JNIEXPORT void JNICALL
DTrace_VPrintln( const char * file, int line, int argc, const char * fmt, va_list arglist ) {
DTrace_VPrintImpl(fmt, arglist);
DTrace_PrintImpl("\n");
}
/*
* Called via DTRACE_ macros. If tracing is enabled at the given location, it enters
* the trace mutex and invokes the callback function to output the trace.
* JNIEXPORT because these functions are also called from libawt_xawt.
*/
JNIEXPORT void JNICALL
DTrace_PrintFunction( DTRACE_PRINT_CALLBACK pfn, dtrace_id * pFileTraceId, dtrace_id * pLineTraceId,
const char * file, int line,
int argc, const char * fmt, ... ) {
va_list arglist;
DASSERT(file != NULL);
DASSERT(line > 0 && line < MAX_LINE);
DASSERT(argc <= MAX_ARGC);
DASSERT(fmt != NULL);
DMutex_Enter(DTraceMutex);
if ( DTrace_IsEnabledAt(pFileTraceId, pLineTraceId, file, line) ) {
va_start(arglist, fmt);
(*pfn)(file, line, argc, fmt, arglist);
va_end(arglist);
}
DMutex_Exit(DTraceMutex);
}
/*
* Sets a callback function to be used to output
* trace statements.
*/
void DTrace_SetOutputCallback(DTRACE_OUTPUT_CALLBACK pfn) {
DASSERT(pfn != NULL);
DMutex_Enter(DTraceMutex);
PfnTraceCallback = pfn;
DMutex_Exit(DTraceMutex);
}
#endif /* DEBUG */
/**********************************************************************************
* Support for Java tracing in release or debug mode builds
*/
static void JNICALL DTrace_PrintStdErr(const char *msg) {
fprintf(stderr, "%s", msg);
fflush(stderr);
}
static void DTrace_JavaPrint(const char * msg) {
#if defined(DEBUG)
DMutex_Enter(DTraceMutex);
DTrace_ClientPrint(msg);
DMutex_Exit(DTraceMutex);
#else
DTrace_PrintStdErr(msg);
#endif
}
static void DTrace_JavaPrintln(const char * msg) {
#if defined(DEBUG)
DMutex_Enter(DTraceMutex);
DTrace_ClientPrint(msg);
DTrace_ClientPrint("\n");
DMutex_Exit(DTraceMutex);
#else
DTrace_PrintStdErr(msg);
DTrace_PrintStdErr("\n");
#endif
}
/*********************************************************************************
* Native method implementations. Java print trace calls are functional in
* release builds, but functions to enable/disable native tracing are not.
*/
/* Implementation of DebugSettings.setCTracingOn*/
/**代码未完, 请加载全部代码(NowJava.com).**/