gecko-dev/js/jsd/jsd_step.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
2012-05-21 11:12:37 +00:00
* 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 - Stepping support
*/
#include "jsd.h"
/*
* #define JSD_TRACE 1
*/
#ifdef JSD_TRACE
static char*
_indentSpaces(int i)
{
#define MAX_INDENT 63
static char* p = nullptr;
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, JSAbstractFramePtr frame,
bool isConstructing, bool before)
{
JSDScript* jsdscript = nullptr;
JSScript * script;
static indent = 0;
JSString* funName = nullptr;
script = frame.script();
if(script)
{
JSD_LOCK_SCRIPTS(jsdc);
jsdscript = jsd_FindOrCreateJSDScript(jsdc, cx, script, frame);
JSD_UNLOCK_SCRIPTS(jsdc);
if(jsdscript)
funName = JSD_GetScriptFunctionId(jsdc, jsdscript);
}
if(before)
printf("%sentering ", _indentSpaces(indent++));
else
printf("%sleaving ", _indentSpaces(--indent));
if (!funName)
printf("TOP_LEVEL");
else
JS_FileEscapedString(stdout, funName, 0);
if(before)
{
jsval thisVal;
printf("%s this: ", isConstructing ? "constructing":"");
if (JS_GetFrameThis(cx, frame, &thisVal))
printf("0x%0llx", (uintptr_t) thisVal);
else
puts("<unavailable>");
}
printf("\n");
JS_ASSERT(indent >= 0);
}
#endif
bool
_callHook(JSDContext *jsdc, JSContext *cx, JSAbstractFramePtr frame, bool isConstructing,
bool before, unsigned type, JSD_CallHookProc hook, void *hookData)
{
JSDScript* jsdscript;
JSScript* jsscript;
bool hookresult = true;
if (!jsdc || !jsdc->inited)
return false;
if (!hook && !(jsdc->flags & JSD_COLLECT_PROFILE_DATA))
{
/* no hook to call, no profile data needs to be collected,
* so there is nothing to do here.
*/
return hookresult;
}
if (before && isConstructing) {
JS::RootedValue newObj(cx);
if (!frame.getThisValue(cx, &newObj))
return false;
jsd_Constructing(jsdc, cx, JSVAL_TO_OBJECT(newObj), frame);
}
jsscript = frame.script();
if (jsscript)
{
JSD_LOCK_SCRIPTS(jsdc);
jsdscript = jsd_FindOrCreateJSDScript(jsdc, cx, jsscript, frame);
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 (!pdata->lastCallStart)
{
int64_t 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_t ll_delta;
pdata->caller = callerpdata;
/* We need to 'stop' the timer for the caller.
* Use time since last return if appropriate. */
ll_delta = jsdc->lastReturnTime
? now - jsdc->lastReturnTime
: now - callerpdata->lastCallStart;
callerpdata->runningTime += ll_delta;
}
/* We're the new current function, and no return
* has happened yet. */
jsdc->callingFunctionPData = pdata;
jsdc->lastReturnTime = 0;
/* This function has no running time (just been
* called!), and we'll need the call start time. */
pdata->runningTime = 0;
pdata->lastCallStart = now;
} else {
if (++pdata->recurseDepth > pdata->maxRecurseDepth)
pdata->maxRecurseDepth = pdata->recurseDepth;
}
/* make sure we're called for the return too. */
hookresult = true;
} else if (!pdata->recurseDepth && pdata->lastCallStart) {
int64_t now, ll_delta;
double delta;
now = JS_Now();
ll_delta = now - pdata->lastCallStart;
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 (jsdc->lastReturnTime)
{
/* Add last chunk to running time, and use total
* running time as 'delta'. */
ll_delta = now - jsdc->lastReturnTime;
pdata->runningTime += ll_delta;
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 = nullptr;
/* Mark the time we returned, and indicate this
* function is no longer running. */
jsdc->lastReturnTime = now;
pdata->lastCallStart = 0;
++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 = true;
}
}
}
#ifdef JSD_TRACE
_interpreterTrace(jsdc, cx, frame, isConstructing, before);
return true;
#else
return hookresult;
#endif
}
void *
jsd_FunctionCallHook(JSContext *cx, JSAbstractFramePtr frame, bool isConstructing,
bool before, bool *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, frame, isConstructing, before,
(before) ? JSD_HOOK_FUNCTION_CALL : JSD_HOOK_FUNCTION_RETURN,
hook, hookData))
{
return closure;
}
return nullptr;
}
void *
jsd_TopLevelCallHook(JSContext *cx, JSAbstractFramePtr frame, bool isConstructing,
bool before, bool *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, frame, isConstructing, before,
(before) ? JSD_HOOK_TOPLEVEL_START : JSD_HOOK_TOPLEVEL_END,
hook, hookData))
{
return closure;
}
return nullptr;
}