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gecko-dev/js/jsd/jsd_high.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* 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/. */
/*
* JavaScript Debugging support - 'High Level' functions
*/
#include "jsd.h"
#include "nsCxPusher.h"
using mozilla::AutoSafeJSContext;
/***************************************************************************/
/* XXX not 'static' because of old Mac CodeWarrior bug */
JSCList _jsd_context_list = JS_INIT_STATIC_CLIST(&_jsd_context_list);
/* these are used to connect JSD_SetUserCallbacks() with JSD_DebuggerOn() */
static JSD_UserCallbacks _callbacks;
static void* _user = nullptr;
static JSRuntime* _jsrt = nullptr;
#ifdef JSD_HAS_DANGEROUS_THREAD
static void* _dangerousThread = nullptr;
#endif
#ifdef JSD_THREADSAFE
JSDStaticLock* _jsd_global_lock = nullptr;
#endif
#ifdef DEBUG
void JSD_ASSERT_VALID_CONTEXT(JSDContext* jsdc)
{
MOZ_ASSERT(jsdc->inited);
MOZ_ASSERT(jsdc->jsrt);
MOZ_ASSERT(jsdc->glob);
}
#endif
/***************************************************************************/
/* xpconnect related utility functions implemented in jsd_xpc.cpp */
extern void
global_finalize(JSFreeOp* fop, JSObject* obj);
extern JSObject*
CreateJSDGlobal(JSContext *cx, const JSClass *clasp);
/***************************************************************************/
static const JSClass global_class = {
"JSDGlobal", JSCLASS_GLOBAL_FLAGS |
JSCLASS_HAS_PRIVATE | JSCLASS_PRIVATE_IS_NSISUPPORTS,
JS_PropertyStub, JS_DeletePropertyStub, JS_PropertyStub, JS_StrictPropertyStub,
JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, global_finalize,
nullptr, nullptr, nullptr,
JS_GlobalObjectTraceHook
};
static bool
_validateUserCallbacks(JSD_UserCallbacks* callbacks)
{
return !callbacks ||
(callbacks->size && callbacks->size <= sizeof(JSD_UserCallbacks));
}
static JSDContext*
_newJSDContext(JSRuntime* jsrt,
JSD_UserCallbacks* callbacks,
void* user,
JSObject* scopeobj)
{
JSDContext* jsdc = nullptr;
bool ok = true;
AutoSafeJSContext cx;
if( ! jsrt )
return nullptr;
if( ! _validateUserCallbacks(callbacks) )
return nullptr;
jsdc = (JSDContext*) calloc(1, sizeof(JSDContext));
if( ! jsdc )
goto label_newJSDContext_failure;
if( ! JSD_INIT_LOCKS(jsdc) )
goto label_newJSDContext_failure;
JS_INIT_CLIST(&jsdc->links);
jsdc->jsrt = jsrt;
if( callbacks )
memcpy(&jsdc->userCallbacks, callbacks, callbacks->size);
jsdc->user = user;
#ifdef JSD_HAS_DANGEROUS_THREAD
jsdc->dangerousThread = _dangerousThread;
#endif
JS_INIT_CLIST(&jsdc->threadsStates);
JS_INIT_CLIST(&jsdc->sources);
JS_INIT_CLIST(&jsdc->removedSources);
jsdc->sourceAlterCount = 1;
if( ! jsd_CreateAtomTable(jsdc) )
goto label_newJSDContext_failure;
if( ! jsd_InitObjectManager(jsdc) )
goto label_newJSDContext_failure;
if( ! jsd_InitScriptManager(jsdc) )
goto label_newJSDContext_failure;
{
JS::RootedObject global(cx, CreateJSDGlobal(cx, &global_class));
if( ! global )
goto label_newJSDContext_failure;
jsdc->glob = global;
JSAutoCompartment ac(cx, jsdc->glob);
ok = JS::AddNamedObjectRoot(cx, &jsdc->glob, "JSD context global") &&
JS_InitStandardClasses(cx, global);
}
if( ! ok )
goto label_newJSDContext_failure;
jsdc->data = nullptr;
jsdc->inited = true;
JSD_LOCK();
JS_INSERT_LINK(&jsdc->links, &_jsd_context_list);
JSD_UNLOCK();
return jsdc;
label_newJSDContext_failure:
if( jsdc ) {
if ( jsdc->glob )
JS::RemoveObjectRootRT(JS_GetRuntime(cx), &jsdc->glob);
jsd_DestroyObjectManager(jsdc);
jsd_DestroyAtomTable(jsdc);
free(jsdc);
}
return nullptr;
}
static void
_destroyJSDContext(JSDContext* jsdc)
{
JSD_ASSERT_VALID_CONTEXT(jsdc);
JSD_LOCK();
JS_REMOVE_LINK(&jsdc->links);
JSD_UNLOCK();
if ( jsdc->glob ) {
JS::RemoveObjectRootRT(jsdc->jsrt, &jsdc->glob);
}
jsd_DestroyObjectManager(jsdc);
jsd_DestroyAtomTable(jsdc);
jsdc->inited = false;
/*
* We should free jsdc here, but we let it leak in case there are any
* asynchronous hooks calling into the system using it as a handle
*
* XXX we also leak the locks
*/
}
/***************************************************************************/
JSDContext*
jsd_DebuggerOnForUser(JSRuntime* jsrt,
JSD_UserCallbacks* callbacks,
void* user,
JSObject* scopeobj)
{
JSDContext* jsdc;
jsdc = _newJSDContext(jsrt, callbacks, user, scopeobj);
if( ! jsdc )
return nullptr;
/*
* Set hooks here. The new/destroy script hooks are on even when
* the debugger is paused. The destroy hook so we'll clean up
* internal data structures when scripts are destroyed, and the
* newscript hook for backwards compatibility for now. We'd like
* to stop doing that.
*/
JS_SetNewScriptHookProc(jsdc->jsrt, jsd_NewScriptHookProc, jsdc);
JS_SetDestroyScriptHookProc(jsdc->jsrt, jsd_DestroyScriptHookProc, jsdc);
jsd_DebuggerUnpause(jsdc);
if( jsdc->userCallbacks.setContext )
jsdc->userCallbacks.setContext(jsdc, jsdc->user);
return jsdc;
}
JSDContext*
jsd_DebuggerOn(void)
{
MOZ_ASSERT(_jsrt);
MOZ_ASSERT(_validateUserCallbacks(&_callbacks));
return jsd_DebuggerOnForUser(_jsrt, &_callbacks, _user, nullptr);
}
void
jsd_DebuggerOff(JSDContext* jsdc)
{
jsd_DebuggerPause(jsdc, true);
/* clear hooks here */
JS_SetNewScriptHookProc(jsdc->jsrt, nullptr, nullptr);
JS_SetDestroyScriptHookProc(jsdc->jsrt, nullptr, nullptr);
/* clean up */
JSD_LockScriptSubsystem(jsdc);
jsd_DestroyScriptManager(jsdc);
JSD_UnlockScriptSubsystem(jsdc);
jsd_DestroyAllSources(jsdc);
_destroyJSDContext(jsdc);
if( jsdc->userCallbacks.setContext )
jsdc->userCallbacks.setContext(nullptr, jsdc->user);
}
void
jsd_DebuggerPause(JSDContext* jsdc, bool forceAllHooksOff)
{
JS_SetDebuggerHandler(jsdc->jsrt, nullptr, nullptr);
if (forceAllHooksOff || !(jsdc->flags & JSD_COLLECT_PROFILE_DATA)) {
JS_SetExecuteHook(jsdc->jsrt, nullptr, nullptr);
JS_SetCallHook(jsdc->jsrt, nullptr, nullptr);
}
JS_SetThrowHook(jsdc->jsrt, nullptr, nullptr);
JS_SetDebugErrorHook(jsdc->jsrt, nullptr, nullptr);
}
static bool
jsd_DebugErrorHook(JSContext *cx, const char *message,
JSErrorReport *report, void *closure);
void
jsd_DebuggerUnpause(JSDContext* jsdc)
{
JS_SetDebuggerHandler(jsdc->jsrt, jsd_DebuggerHandler, jsdc);
JS_SetExecuteHook(jsdc->jsrt, jsd_TopLevelCallHook, jsdc);
JS_SetCallHook(jsdc->jsrt, jsd_FunctionCallHook, jsdc);
JS_SetThrowHook(jsdc->jsrt, jsd_ThrowHandler, jsdc);
JS_SetDebugErrorHook(jsdc->jsrt, jsd_DebugErrorHook, jsdc);
}
void
jsd_SetUserCallbacks(JSRuntime* jsrt, JSD_UserCallbacks* callbacks, void* user)
{
_jsrt = jsrt;
_user = user;
#ifdef JSD_HAS_DANGEROUS_THREAD
_dangerousThread = JSD_CURRENT_THREAD();
#endif
if( callbacks )
memcpy(&_callbacks, callbacks, sizeof(JSD_UserCallbacks));
else
memset(&_callbacks, 0 , sizeof(JSD_UserCallbacks));
}
void*
jsd_SetContextPrivate(JSDContext* jsdc, void *data)
{
jsdc->data = data;
return data;
}
void*
jsd_GetContextPrivate(JSDContext* jsdc)
{
return jsdc->data;
}
void
jsd_ClearAllProfileData(JSDContext* jsdc)
{
JSDScript *current;
JSD_LOCK_SCRIPTS(jsdc);
current = (JSDScript *)jsdc->scripts.next;
while (current != (JSDScript *)&jsdc->scripts)
{
jsd_ClearScriptProfileData(jsdc, current);
current = (JSDScript *)current->links.next;
}
JSD_UNLOCK_SCRIPTS(jsdc);
}
JSDContext*
jsd_JSDContextForJSContext(JSContext* context)
{
JSDContext* iter;
JSDContext* jsdc = nullptr;
JSRuntime* runtime = JS_GetRuntime(context);
JSD_LOCK();
for( iter = (JSDContext*)_jsd_context_list.next;
iter != (JSDContext*)&_jsd_context_list;
iter = (JSDContext*)iter->links.next )
{
if( runtime == iter->jsrt )
{
jsdc = iter;
break;
}
}
JSD_UNLOCK();
return jsdc;
}
static bool
jsd_DebugErrorHook(JSContext *cx, const char *message,
JSErrorReport *report, void *closure)
{
JSDContext* jsdc = (JSDContext*) closure;
JSD_ErrorReporter errorReporter;
void* errorReporterData;
if( ! jsdc )
{
MOZ_ASSERT(0);
return true;
}
if( JSD_IS_DANGEROUS_THREAD(jsdc) )
return true;
/* local in case hook gets cleared on another thread */
JSD_LOCK();
errorReporter = jsdc->errorReporter;
errorReporterData = jsdc->errorReporterData;
JSD_UNLOCK();
if(!errorReporter)
return true;
switch(errorReporter(jsdc, cx, message, report, errorReporterData))
{
case JSD_ERROR_REPORTER_PASS_ALONG:
return true;
case JSD_ERROR_REPORTER_RETURN:
return false;
case JSD_ERROR_REPORTER_DEBUG:
{
JS::RootedValue rval(cx);
JSD_ExecutionHookProc hook;
void* hookData;
/* local in case hook gets cleared on another thread */
JSD_LOCK();
hook = jsdc->debugBreakHook;
hookData = jsdc->debugBreakHookData;
JSD_UNLOCK();
jsd_CallExecutionHook(jsdc, cx, JSD_HOOK_DEBUG_REQUESTED,
hook, hookData, rval.address());
/* XXX Should make this dependent on ExecutionHook retval */
return true;
}
case JSD_ERROR_REPORTER_CLEAR_RETURN:
if(report && JSREPORT_IS_EXCEPTION(report->flags))
JS_ClearPendingException(cx);
return false;
default:
MOZ_ASSERT(0);
break;
}
return true;
}
bool
jsd_SetErrorReporter(JSDContext* jsdc,
JSD_ErrorReporter reporter,
void* callerdata)
{
JSD_LOCK();
jsdc->errorReporter = reporter;
jsdc->errorReporterData = callerdata;
JSD_UNLOCK();
return true;
}
bool
jsd_GetErrorReporter(JSDContext* jsdc,
JSD_ErrorReporter* reporter,
void** callerdata)
{
JSD_LOCK();
if( reporter )
*reporter = jsdc->errorReporter;
if( callerdata )
*callerdata = jsdc->errorReporterData;
JSD_UNLOCK();
return true;
}
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