RetroZilla/js/jsd/jsd_step.c

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2015-10-21 05:03:22 +02:00
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* JavaScript Debugging support - Stepping support
*/
#include "jsd.h"
/*
* #define JSD_TRACE 1
*/
#ifdef JSD_TRACE
static char*
_indentSpaces(int i)
{
#define MAX_INDENT 63
static char* p = NULL;
if(!p)
{
p = calloc(1, MAX_INDENT+1);
if(!p) return "";
memset(p, ' ', MAX_INDENT);
}
if(i > MAX_INDENT) return p;
return p + MAX_INDENT-i;
}
static void
_interpreterTrace(JSDContext* jsdc, JSContext *cx, JSStackFrame *fp,
JSBool before)
{
JSDScript* jsdscript = NULL;
JSScript * script;
static indent = 0;
char* buf;
const char* funName = NULL;
script = JS_GetFrameScript(cx, fp);
if(script)
{
JSD_LOCK_SCRIPTS(jsdc);
jsdscript = jsd_FindJSDScript(jsdc, script);
JSD_UNLOCK_SCRIPTS(jsdc);
if(jsdscript)
funName = JSD_GetScriptFunctionName(jsdc, jsdscript);
}
if(!funName)
funName = "TOP_LEVEL";
if(before)
{
buf = JS_smprintf("%sentering %s %s this: %0x\n",
_indentSpaces(indent++),
funName,
JS_IsConstructorFrame(cx, fp) ? "constructing":"",
(int)JS_GetFrameThis(cx, fp));
}
else
{
buf = JS_smprintf("%sleaving %s\n",
_indentSpaces(--indent),
funName);
}
JS_ASSERT(indent >= 0);
if(!buf)
return;
printf(buf);
free(buf);
}
#endif
JSBool
_callHook(JSDContext *jsdc, JSContext *cx, JSStackFrame *fp, JSBool before,
uintN type, JSD_CallHookProc hook, void *hookData)
{
JSDScript* jsdscript;
JSScript* jsscript;
JSBool hookresult = JS_TRUE;
if (!jsdc || !jsdc->inited)
return JS_FALSE;
if (!hook && !(jsdc->flags & JSD_COLLECT_PROFILE_DATA) &&
jsdc->flags & JSD_DISABLE_OBJECT_TRACE)
{
/* no hook to call, no profile data needs to be collected, and
* the client has object tracing disabled, so there is nothing
* to do here.
*/
return hookresult;
}
if (before && JS_IsConstructorFrame(cx, fp))
jsd_Constructing(jsdc, cx, JS_GetFrameThis(cx, fp), fp);
jsscript = JS_GetFrameScript(cx, fp);
if (jsscript)
{
JSD_LOCK_SCRIPTS(jsdc);
jsdscript = jsd_FindJSDScript(jsdc, jsscript);
JSD_UNLOCK_SCRIPTS(jsdc);
if (jsdscript)
{
if (JSD_IS_PROFILE_ENABLED(jsdc, jsdscript))
{
JSDProfileData *pdata;
pdata = jsd_GetScriptProfileData (jsdc, jsdscript);
if (pdata)
{
if (before)
{
if (JSLL_IS_ZERO(pdata->lastCallStart))
{
int64 now;
JSDProfileData *callerpdata;
/* Get the time just the once, for consistency. */
now = JS_Now();
/* This contains a pointer to the profile data for
* the caller of this function. */
callerpdata = jsdc->callingFunctionPData;
if (callerpdata)
{
int64 ll_delta;
pdata->caller = callerpdata;
/* We need to 'stop' the timer for the caller.
* Use time since last return if appropriate. */
if (JSLL_IS_ZERO(jsdc->lastReturnTime))
{
JSLL_SUB(ll_delta, now, callerpdata->lastCallStart);
} else {
JSLL_SUB(ll_delta, now, jsdc->lastReturnTime);
}
JSLL_ADD(callerpdata->runningTime, callerpdata->runningTime, ll_delta);
}
/* We're the new current function, and no return
* has happened yet. */
jsdc->callingFunctionPData = pdata;
jsdc->lastReturnTime = JSLL_ZERO;
/* This function has no running time (just been
* called!), and we'll need the call start time. */
pdata->runningTime = JSLL_ZERO;
pdata->lastCallStart = now;
} else {
if (++pdata->recurseDepth > pdata->maxRecurseDepth)
pdata->maxRecurseDepth = pdata->recurseDepth;
}
/* make sure we're called for the return too. */
hookresult = JS_TRUE;
} else if (!pdata->recurseDepth &&
!JSLL_IS_ZERO(pdata->lastCallStart)) {
int64 now, ll_delta;
jsdouble delta;
now = JS_Now();
JSLL_SUB(ll_delta, now, pdata->lastCallStart);
JSLL_L2D(delta, ll_delta);
delta /= 1000.0;
pdata->totalExecutionTime += delta;
/* minExecutionTime starts as 0, so we need to overwrite
* it on the first call always. */
if ((0 == pdata->callCount) ||
delta < pdata->minExecutionTime)
{
pdata->minExecutionTime = delta;
}
if (delta > pdata->maxExecutionTime)
pdata->maxExecutionTime = delta;
/* If we last returned from a function (as opposed to
* having last entered this function), we need to inc.
* the running total by the time delta since the last
* return, and use the running total instead of the
* delta calculated above. */
if (!JSLL_IS_ZERO(jsdc->lastReturnTime))
{
/* Add last chunk to running time, and use total
* running time as 'delta'. */
JSLL_SUB(ll_delta, now, jsdc->lastReturnTime);
JSLL_ADD(pdata->runningTime, pdata->runningTime, ll_delta);
JSLL_L2D(delta, pdata->runningTime);
delta /= 1000.0;
}
pdata->totalOwnExecutionTime += delta;
/* See minExecutionTime comment above. */
if ((0 == pdata->callCount) ||
delta < pdata->minOwnExecutionTime)
{
pdata->minOwnExecutionTime = delta;
}
if (delta > pdata->maxOwnExecutionTime)
pdata->maxOwnExecutionTime = delta;
/* Current function is now our caller. */
jsdc->callingFunctionPData = pdata->caller;
/* No hanging pointers, please. */
pdata->caller = NULL;
/* Mark the time we returned, and indicate this
* function is no longer running. */
jsdc->lastReturnTime = now;
pdata->lastCallStart = JSLL_ZERO;
++pdata->callCount;
} else if (pdata->recurseDepth) {
--pdata->recurseDepth;
++pdata->callCount;
}
}
if (hook)
jsd_CallCallHook (jsdc, cx, type, hook, hookData);
} else {
if (hook)
hookresult =
jsd_CallCallHook (jsdc, cx, type, hook, hookData);
else
hookresult = JS_TRUE;
}
}
}
#ifdef JSD_TRACE
_interpreterTrace(jsdc, cx, fp, before);
return JS_TRUE;
#else
return hookresult;
#endif
}
void * JS_DLL_CALLBACK
jsd_FunctionCallHook(JSContext *cx, JSStackFrame *fp, JSBool before,
JSBool *ok, void *closure)
{
JSDContext* jsdc;
JSD_CallHookProc hook;
void* hookData;
jsdc = (JSDContext*) closure;
/* local in case jsdc->functionHook gets cleared on another thread */
JSD_LOCK();
hook = jsdc->functionHook;
hookData = jsdc->functionHookData;
JSD_UNLOCK();
if (_callHook (jsdc, cx, fp, before,
(before) ? JSD_HOOK_FUNCTION_CALL : JSD_HOOK_FUNCTION_RETURN,
hook, hookData))
{
return closure;
}
return NULL;
}
void * JS_DLL_CALLBACK
jsd_TopLevelCallHook(JSContext *cx, JSStackFrame *fp, JSBool before,
JSBool *ok, void *closure)
{
JSDContext* jsdc;
JSD_CallHookProc hook;
void* hookData;
jsdc = (JSDContext*) closure;
/* local in case jsdc->toplevelHook gets cleared on another thread */
JSD_LOCK();
hook = jsdc->toplevelHook;
hookData = jsdc->toplevelHookData;
JSD_UNLOCK();
if (_callHook (jsdc, cx, fp, before,
(before) ? JSD_HOOK_TOPLEVEL_START : JSD_HOOK_TOPLEVEL_END,
hook, hookData))
{
return closure;
}
return NULL;
}