зеркало из https://github.com/mozilla/gecko-dev.git
287 строки
9.8 KiB
C++
287 строки
9.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* JavaScript Debugging support - Stepping support
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*/
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#include "jsd.h"
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/*
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* #define JSD_TRACE 1
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*/
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#ifdef JSD_TRACE
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static char*
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_indentSpaces(int i)
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{
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#define MAX_INDENT 63
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static char* p = NULL;
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if(!p)
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{
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p = calloc(1, MAX_INDENT+1);
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if(!p) return "";
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memset(p, ' ', MAX_INDENT);
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}
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if(i > MAX_INDENT) return p;
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return p + MAX_INDENT-i;
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}
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static void
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_interpreterTrace(JSDContext* jsdc, JSContext *cx, JSAbstractFramePtr frame,
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bool isConstructing, JSBool before)
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{
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JSDScript* jsdscript = NULL;
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JSScript * script;
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static indent = 0;
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JSString* funName = NULL;
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script = frame.script();
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if(script)
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{
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JSD_LOCK_SCRIPTS(jsdc);
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jsdscript = jsd_FindOrCreateJSDScript(jsdc, cx, script, frame);
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JSD_UNLOCK_SCRIPTS(jsdc);
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if(jsdscript)
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funName = JSD_GetScriptFunctionId(jsdc, jsdscript);
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}
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if(before)
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printf("%sentering ", _indentSpaces(indent++));
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else
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printf("%sleaving ", _indentSpaces(--indent));
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if (!funName)
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printf("TOP_LEVEL");
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else
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JS_FileEscapedString(stdout, funName, 0);
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if(before)
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{
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jsval thisVal;
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printf("%s this: ", isConstructing ? "constructing":"");
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if (JS_GetFrameThis(cx, frame, &thisVal))
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printf("0x%0llx", (uintptr_t) thisVal);
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else
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puts("<unavailable>");
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}
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printf("\n");
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JS_ASSERT(indent >= 0);
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}
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#endif
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JSBool
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_callHook(JSDContext *jsdc, JSContext *cx, JSAbstractFramePtr frame, bool isConstructing,
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JSBool before, unsigned type, JSD_CallHookProc hook, void *hookData)
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{
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JSDScript* jsdscript;
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JSScript* jsscript;
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JSBool hookresult = JS_TRUE;
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if (!jsdc || !jsdc->inited)
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return JS_FALSE;
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if (!hook && !(jsdc->flags & JSD_COLLECT_PROFILE_DATA))
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{
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/* no hook to call, no profile data needs to be collected,
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* so there is nothing to do here.
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*/
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return hookresult;
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}
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if (before && isConstructing) {
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JS::RootedValue newObj(cx);
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if (!frame.getThisValue(cx, &newObj))
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return JS_FALSE;
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jsd_Constructing(jsdc, cx, JSVAL_TO_OBJECT(newObj), frame);
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}
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jsscript = frame.script();
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if (jsscript)
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{
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JSD_LOCK_SCRIPTS(jsdc);
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jsdscript = jsd_FindOrCreateJSDScript(jsdc, cx, jsscript, frame);
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JSD_UNLOCK_SCRIPTS(jsdc);
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if (jsdscript)
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{
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if (JSD_IS_PROFILE_ENABLED(jsdc, jsdscript))
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{
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JSDProfileData *pdata;
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pdata = jsd_GetScriptProfileData (jsdc, jsdscript);
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if (pdata)
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{
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if (before)
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{
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if (!pdata->lastCallStart)
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{
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int64_t now;
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JSDProfileData *callerpdata;
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/* Get the time just the once, for consistency. */
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now = JS_Now();
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/* This contains a pointer to the profile data for
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* the caller of this function. */
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callerpdata = jsdc->callingFunctionPData;
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if (callerpdata)
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{
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int64_t ll_delta;
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pdata->caller = callerpdata;
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/* We need to 'stop' the timer for the caller.
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* Use time since last return if appropriate. */
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ll_delta = jsdc->lastReturnTime
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? now - jsdc->lastReturnTime
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: now - callerpdata->lastCallStart;
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callerpdata->runningTime += ll_delta;
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}
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/* We're the new current function, and no return
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* has happened yet. */
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jsdc->callingFunctionPData = pdata;
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jsdc->lastReturnTime = 0;
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/* This function has no running time (just been
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* called!), and we'll need the call start time. */
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pdata->runningTime = 0;
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pdata->lastCallStart = now;
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} else {
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if (++pdata->recurseDepth > pdata->maxRecurseDepth)
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pdata->maxRecurseDepth = pdata->recurseDepth;
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}
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/* make sure we're called for the return too. */
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hookresult = JS_TRUE;
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} else if (!pdata->recurseDepth && pdata->lastCallStart) {
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int64_t now, ll_delta;
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double delta;
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now = JS_Now();
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ll_delta = now - pdata->lastCallStart;
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delta = ll_delta;
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delta /= 1000.0;
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pdata->totalExecutionTime += delta;
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/* minExecutionTime starts as 0, so we need to overwrite
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* it on the first call always. */
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if ((0 == pdata->callCount) ||
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delta < pdata->minExecutionTime)
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{
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pdata->minExecutionTime = delta;
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}
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if (delta > pdata->maxExecutionTime)
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pdata->maxExecutionTime = delta;
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/* If we last returned from a function (as opposed to
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* having last entered this function), we need to inc.
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* the running total by the time delta since the last
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* return, and use the running total instead of the
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* delta calculated above. */
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if (jsdc->lastReturnTime)
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{
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/* Add last chunk to running time, and use total
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* running time as 'delta'. */
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ll_delta = now - jsdc->lastReturnTime;
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pdata->runningTime += ll_delta;
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delta = pdata->runningTime;
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delta /= 1000.0;
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}
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pdata->totalOwnExecutionTime += delta;
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/* See minExecutionTime comment above. */
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if ((0 == pdata->callCount) ||
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delta < pdata->minOwnExecutionTime)
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{
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pdata->minOwnExecutionTime = delta;
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}
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if (delta > pdata->maxOwnExecutionTime)
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pdata->maxOwnExecutionTime = delta;
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/* Current function is now our caller. */
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jsdc->callingFunctionPData = pdata->caller;
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/* No hanging pointers, please. */
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pdata->caller = NULL;
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/* Mark the time we returned, and indicate this
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* function is no longer running. */
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jsdc->lastReturnTime = now;
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pdata->lastCallStart = 0;
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++pdata->callCount;
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} else if (pdata->recurseDepth) {
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--pdata->recurseDepth;
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++pdata->callCount;
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}
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}
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if (hook)
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jsd_CallCallHook (jsdc, cx, type, hook, hookData);
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} else {
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if (hook)
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hookresult =
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jsd_CallCallHook (jsdc, cx, type, hook, hookData);
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else
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hookresult = JS_TRUE;
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}
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}
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}
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#ifdef JSD_TRACE
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_interpreterTrace(jsdc, cx, frame, isConstructing, before);
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return JS_TRUE;
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#else
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return hookresult;
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#endif
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}
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void *
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jsd_FunctionCallHook(JSContext *cx, JSAbstractFramePtr frame, bool isConstructing,
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JSBool before, JSBool *ok, void *closure)
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{
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JSDContext* jsdc;
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JSD_CallHookProc hook;
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void* hookData;
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jsdc = (JSDContext*) closure;
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/* local in case jsdc->functionHook gets cleared on another thread */
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JSD_LOCK();
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hook = jsdc->functionHook;
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hookData = jsdc->functionHookData;
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JSD_UNLOCK();
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if (_callHook (jsdc, cx, frame, isConstructing, before,
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(before) ? JSD_HOOK_FUNCTION_CALL : JSD_HOOK_FUNCTION_RETURN,
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hook, hookData))
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{
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return closure;
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}
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return NULL;
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}
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void *
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jsd_TopLevelCallHook(JSContext *cx, JSAbstractFramePtr frame, bool isConstructing,
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JSBool before, JSBool *ok, void *closure)
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{
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JSDContext* jsdc;
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JSD_CallHookProc hook;
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void* hookData;
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jsdc = (JSDContext*) closure;
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/* local in case jsdc->toplevelHook gets cleared on another thread */
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JSD_LOCK();
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hook = jsdc->toplevelHook;
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hookData = jsdc->toplevelHookData;
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JSD_UNLOCK();
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if (_callHook (jsdc, cx, frame, isConstructing, before,
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(before) ? JSD_HOOK_TOPLEVEL_START : JSD_HOOK_TOPLEVEL_END,
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hook, hookData))
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{
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return closure;
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}
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return NULL;
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}
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