jsiruntime.cpp

OSB-PIK-OpenVXI-3.0.0源代码 “中国XML论坛 - 专业的XML技术讨论区--XML在语音技术中的应用”

/*****************************************************************************
  *****************************************************************************
  *
  * $Id: JsiRuntime.cpp,v 1.13.2.2 2003/10/06 19:11:32 mpanacci Exp $
  *
  * JsiRuntime, class for managing JavaScript runtime environments
  *
  * The JsiRuntime class represents a JavaScript interpreter runtime
  * environment, which is the overall JavaScript engine execution space
  * (compiler, interpreter, decompiler, garbage collector, etc.) which
  * can hold zero or more JavaScript contexts (JsiContext objects).
  *
  *****************************************************************************
  ****************************************************************************/
 

 /****************License************************************************
  *
  * Copyright 2000-2003.  ScanSoft, Inc.    
  *
  * Use of this software is subject to notices and obligations set forth 
  * in the SpeechWorks Public License - Software Version 1.2 which is 
  * included with this software. 
  *
  * ScanSoft is a registered trademark of ScanSoft, Inc., and OpenSpeech, 
  * SpeechWorks and the SpeechWorks logo are registered trademarks or 
  * trademarks of SpeechWorks International, Inc. in the United States 
  * and other countries.
  *
  ***********************************************************************/
 

 static const char *rcsid = 0 ? (char *) &rcsid :
 "$Id: JsiRuntime.cpp,v 1.13.2.2 2003/10/06 19:11:32 mpanacci Exp $";
 
 // -----1=0-------2=0-------3=0-------4=0-------5=0-------6=0-------7=0-------8
 
 
 #include "SBjsiInternal.h"
 
 #include "JsiRuntime.hpp"          // Defines this class
 
 #ifndef JS_THREADSAFE
 #include "VXItrd.h"                // For VXItrdMutex object and functions
 #endif
 #include "SBjsiLog.h"              // For logging
 
 #include <jsapi.h>                 // SpiderMonkey JavaScript API
 
 // -----1=0-------2=0-------3=0-------4=0-------5=0-------6=0-------7=0-------8
 
 
 // Constructor, only does initialization that cannot fail
 JsiRuntime::JsiRuntime( ) : SBjsiLogger(MODULE_SBJSI, NULL, 0), runtime(NULL)
 #ifndef JS_THREADSAFE
   , mutex(NULL)
 #endif
 {
 }
 
 
 // Destructor
 JsiRuntime::~JsiRuntime( )
 {
   // Destroy the runtime
   if ( runtime )
     JS_DestroyRuntime (runtime);
 
 #ifndef JS_THREADSAFE
   // Destroy the mutex
   if ( mutex )
     VXItrdMutexDestroy (&mutex);
 #endif
 }
 
 
 // Creation method
 VXIjsiResult JsiRuntime::Create (long runtimeSize,
 				 VXIlogInterface *l,
 				 VXIunsigned diagTagBase)
 {
   if (( runtimeSize < 1 ) || ( ! l ))
     return VXIjsi_RESULT_INVALID_ARGUMENT;
 
   // Initialize the logging base class
   SetLog (l, diagTagBase);
 
   VXIjsiResult rc = VXIjsi_RESULT_SUCCESS;
 
 #ifndef JS_THREADSAFE
   // Create the mutex
   if ( VXItrdMutexCreate (&mutex) != VXItrd_RESULT_SUCCESS )
     rc = VXIjsi_RESULT_SYSTEM_ERROR;
 #endif
 
   if ( rc == VXIjsi_RESULT_SUCCESS ) {
     // Create the runtime, must do this within a mutex to ensure
     // this is thread safe due to us using a non-thread safe build
     // of SpiderMonkey for performance reasons
     runtime = JS_NewRuntime (runtimeSize);
     if ( runtime == NULL ) {
       rc = VXIjsi_RESULT_OUT_OF_MEMORY;
     } else {
       // Set this as the runtime's private data
       JS_SetRuntimePrivate (runtime, this);
 
       // Enable garbage collection tracking
       JS_SetGCCallbackRT (runtime, JsiRuntime::GCCallback);
     }
   }
   
   return rc;
 }
 
 
 // Get a new JavaScript context for the runtime
 VXIjsiResult JsiRuntime::NewContext (long contextSize, JSContext **context)
 {
   if (( contextSize < 1 ) || ( context == NULL ))
     return VXIjsi_RESULT_INVALID_ARGUMENT;
 
 #ifndef JS_THREADSAFE
   if ( AccessBegin( ) == false )
     return VXIjsi_RESULT_SYSTEM_ERROR;
 #endif
 
   // Create the context
   JSContext *newContext = JS_NewContext (runtime, contextSize);
   if ( newContext == NULL )
     return VXIjsi_RESULT_OUT_OF_MEMORY;
 
 #ifndef JS_THREADSAFE
   if ( AccessEnd( ) == false ) {
     DestroyContext (&newContext);
     return VXIjsi_RESULT_SYSTEM_ERROR;
   }
 #endif
 
   *context = newContext;
   return VXIjsi_RESULT_SUCCESS;
 }
 
 
 // Destroy a JavaScript context for the runtime
 VXIjsiResult JsiRuntime::DestroyContext (JSContext **context)
 {
   if (( context == NULL ) || ( *context == NULL ))
     return VXIjsi_RESULT_INVALID_ARGUMENT;
 
 #ifndef JS_THREADSAFE
   if ( AccessBegin( ) == false )
     return VXIjsi_RESULT_SYSTEM_ERROR;
 #endif
 
   // Destroy the context
   JS_DestroyContext (*context);
 
 #ifndef JS_THREADSAFE
   if ( AccessEnd( ) == false )
     return VXIjsi_RESULT_SYSTEM_ERROR;
 #endif
 
   *context = NULL;
   return VXIjsi_RESULT_SUCCESS;
 }
 
 
 #ifndef JS_THREADSAFE
 
 // Flag that we are beginning and ending access of a context within
 // this runtime, used to ensure thread safety. For simplicity,
 // return true on success, false on failure (mutex error).
 bool JsiRuntime::AccessBegin( ) const
 {
   return (VXItrdMutexLock (mutex) == VXItrd_RESULT_SUCCESS ? true : false);
 }
 
 
 bool JsiRuntime::AccessEnd( ) const
 {
   return (VXItrdMutexUnlock (mutex) == VXItrd_RESULT_SUCCESS ? true : false);
 }
 
 #endif /* JS_THREADSAFE */
 
 
 // Static callback for diagnostic logging of garbage collection
 JSBool JS_DLL_CALLBACK 
 JsiRuntime::GCCallback (JSContext *context, JSGCStatus status)
 {
   JSBool rc = JS_TRUE;
 
   // Get the runtime, then this runtime object
   JSRuntime *rt = JS_GetRuntime (context);
   if ( rt == NULL ) {
     rc = JS_FALSE; // Fatal error
   } else {
     const JsiRuntime *pThis = (const JsiRuntime *) JS_GetRuntimePrivate (rt);
     if ( pThis == NULL ) {
       return JS_FALSE; // Fatal error
     } else {
       // Log the garbage collection state
       switch (status) {
       case JSGC_BEGIN:
 	pThis->Diag (SBJSI_LOG_GC, NULL, L"begin 0x%p", context);
 	break;
       case JSGC_END:
 	pThis->Diag (SBJSI_LOG_GC, NULL, L"end 0x%p", context);
 	break;
       case JSGC_MARK_END:
 	// Diag (SBJSI_LOG_GC, NULL, L"mark end 0x%p", context);
 	break;
       default:
 	pThis->Diag (SBJSI_LOG_GC, NULL, L"unknown %d 0x%p", status, context);
 	break;
       }
     }
   }
 
   return rc;
 }