339 lines
9.9 KiB
C++
339 lines
9.9 KiB
C++
/* Copyright (C) 2014 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precompiled.h"
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#include "ScriptRuntime.h"
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#include "ps/GameSetup/Config.h"
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#include "ps/Profile.h"
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void GCSliceCallbackHook(JSRuntime* UNUSED(rt), JS::GCProgress progress, const JS::GCDescription& UNUSED(desc))
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{
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/*
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* During non-incremental GC, the GC is bracketed by JSGC_CYCLE_BEGIN/END
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* callbacks. During an incremental GC, the sequence of callbacks is as
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* follows:
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* JSGC_CYCLE_BEGIN, JSGC_SLICE_END (first slice)
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* JSGC_SLICE_BEGIN, JSGC_SLICE_END (second slice)
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* ...
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* JSGC_SLICE_BEGIN, JSGC_CYCLE_END (last slice)
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*/
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if (progress == JS::GC_SLICE_BEGIN)
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{
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if (CProfileManager::IsInitialised() && ThreadUtil::IsMainThread())
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g_Profiler.Start("GCSlice");
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g_Profiler2.RecordRegionEnter("GCSlice");
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}
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else if (progress == JS::GC_SLICE_END)
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{
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if (CProfileManager::IsInitialised() && ThreadUtil::IsMainThread())
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g_Profiler.Stop();
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g_Profiler2.RecordRegionLeave("GCSlice");
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}
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else if (progress == JS::GC_CYCLE_BEGIN)
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{
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if (CProfileManager::IsInitialised() && ThreadUtil::IsMainThread())
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g_Profiler.Start("GCSlice");
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g_Profiler2.RecordRegionEnter("GCSlice");
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}
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else if (progress == JS::GC_CYCLE_END)
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{
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if (CProfileManager::IsInitialised() && ThreadUtil::IsMainThread())
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g_Profiler.Stop();
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g_Profiler2.RecordRegionLeave("GCSlice");
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}
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// The following code can be used to print some information aobut garbage collection
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// Search for "Nonincremental reason" if there are problems running GC incrementally.
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#if 0
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if (progress == JS::GCProgress::GC_CYCLE_BEGIN)
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printf("starting cycle ===========================================\n");
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const jschar* str = desc.formatMessage(rt);
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int len = 0;
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for(int i = 0; i < 10000; i++)
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{
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len++;
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if(!str[i])
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break;
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}
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wchar_t outstring[len];
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for(int i = 0; i < len; i++)
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{
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outstring[i] = (wchar_t)str[i];
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}
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printf("---------------------------------------\n: %ls \n---------------------------------------\n", outstring);
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#endif
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}
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void ScriptRuntime::GCCallback(JSRuntime* UNUSED(rt), JSGCStatus status, void *data)
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{
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if (status == JSGC_END)
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reinterpret_cast<ScriptRuntime*>(data)->GCCallbackMember();
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}
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void ScriptRuntime::GCCallbackMember()
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{
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m_FinalizationListObjectIdCache.clear();
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}
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void ScriptRuntime::AddDeferredFinalizationObject(const std::shared_ptr<void>& obj)
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{
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m_FinalizationListObjectIdCache.push_back(obj);
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}
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bool ScriptRuntime::m_Initialized = false;
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ScriptRuntime::ScriptRuntime(shared_ptr<ScriptRuntime> parentRuntime, int runtimeSize, int heapGrowthBytesGCTrigger):
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m_LastGCBytes(0),
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m_LastGCCheck(0.0f),
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m_HeapGrowthBytesGCTrigger(heapGrowthBytesGCTrigger),
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m_RuntimeSize(runtimeSize)
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{
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if (!m_Initialized)
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{
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ENSURE(JS_Init());
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m_Initialized = true;
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}
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JSRuntime* parentJSRuntime = parentRuntime ? parentRuntime->m_rt : nullptr;
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m_rt = JS_NewRuntime(runtimeSize, JS_USE_HELPER_THREADS, parentJSRuntime);
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ENSURE(m_rt); // TODO: error handling
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if (g_ScriptProfilingEnabled)
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{
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// Execute and call hooks are disabled if the runtime debug mode is disabled
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JS_SetRuntimeDebugMode(m_rt, true);
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// Profiler isn't thread-safe, so only enable this on the main thread
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if (ThreadUtil::IsMainThread())
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{
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if (CProfileManager::IsInitialised())
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{
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JS_SetExecuteHook(m_rt, jshook_script, this);
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JS_SetCallHook(m_rt, jshook_function, this);
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}
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}
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}
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JS::SetGCSliceCallback(m_rt, GCSliceCallbackHook);
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JS_SetGCCallback(m_rt, ScriptRuntime::GCCallback, this);
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JS_SetGCParameter(m_rt, JSGC_MAX_MALLOC_BYTES, m_RuntimeSize);
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JS_SetGCParameter(m_rt, JSGC_MAX_BYTES, m_RuntimeSize);
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JS_SetGCParameter(m_rt, JSGC_MODE, JSGC_MODE_INCREMENTAL);
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// The whole heap-growth mechanism seems to work only for non-incremental GCs.
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// We disable it to make it more clear if full GCs happen triggered by this JSAPI internal mechanism.
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JS_SetGCParameter(m_rt, JSGC_DYNAMIC_HEAP_GROWTH, false);
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m_dummyContext = JS_NewContext(m_rt, STACK_CHUNK_SIZE);
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ENSURE(m_dummyContext);
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}
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ScriptRuntime::~ScriptRuntime()
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{
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JS_DestroyContext(m_dummyContext);
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JS_SetGCCallback(m_rt, nullptr, nullptr);
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JS_DestroyRuntime(m_rt);
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ENSURE(m_FinalizationListObjectIdCache.empty() && "Leak: Removing callback while some objects still aren't finalized!");
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}
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void ScriptRuntime::RegisterContext(JSContext* cx)
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{
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m_Contexts.push_back(cx);
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}
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void ScriptRuntime::UnRegisterContext(JSContext* cx)
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{
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m_Contexts.remove(cx);
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}
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#define GC_DEBUG_PRINT 0
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void ScriptRuntime::MaybeIncrementalGC(double delay)
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{
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PROFILE2("MaybeIncrementalGC");
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if (JS::IsIncrementalGCEnabled(m_rt))
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{
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// The idea is to get the heap size after a completed GC and trigger the next GC when the heap size has
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// reached m_LastGCBytes + X.
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// In practice it doesn't quite work like that. When the incremental marking is completed, the sweeping kicks in.
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// The sweeping actually frees memory and it does this in a background thread (if JS_USE_HELPER_THREADS is set).
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// While the sweeping is happening we already run scripts again and produce new garbage.
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const int GCSliceTimeBudget = 30; // Milliseconds an incremental slice is allowed to run
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// Have a minimum time in seconds to wait between GC slices and before starting a new GC to distribute the GC
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// load and to hopefully make it unnoticeable for the player. This value should be high enough to distribute
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// the load well enough and low enough to make sure we don't run out of memory before we can start with the
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// sweeping.
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if (timer_Time() - m_LastGCCheck < delay)
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return;
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m_LastGCCheck = timer_Time();
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int gcBytes = JS_GetGCParameter(m_rt, JSGC_BYTES);
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#if GC_DEBUG_PRINT
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std::cout << "gcBytes: " << gcBytes / 1024 << " KB" << std::endl;
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#endif
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if (m_LastGCBytes > gcBytes || m_LastGCBytes == 0)
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{
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#if GC_DEBUG_PRINT
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printf("Setting m_LastGCBytes: %d KB \n", gcBytes / 1024);
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#endif
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m_LastGCBytes = gcBytes;
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}
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// Run an additional incremental GC slice if the currently running incremental GC isn't over yet
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// ... or
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// start a new incremental GC if the JS heap size has grown enough for a GC to make sense
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if (JS::IsIncrementalGCInProgress(m_rt) || (gcBytes - m_LastGCBytes > m_HeapGrowthBytesGCTrigger))
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{
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#if GC_DEBUG_PRINT
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if (JS::IsIncrementalGCInProgress(m_rt))
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printf("An incremental GC cycle is in progress. \n");
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else
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printf("GC needed because JSGC_BYTES - m_LastGCBytes > m_HeapGrowthBytesGCTrigger \n"
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" JSGC_BYTES: %d KB \n m_LastGCBytes: %d KB \n m_HeapGrowthBytesGCTrigger: %d KB \n",
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gcBytes / 1024,
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m_LastGCBytes / 1024,
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m_HeapGrowthBytesGCTrigger / 1024);
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#endif
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// A hack to make sure we never exceed the runtime size because we can't collect the memory
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// fast enough.
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if(gcBytes > m_RuntimeSize / 2)
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{
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if (JS::IsIncrementalGCInProgress(m_rt))
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{
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#if GC_DEBUG_PRINT
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printf("Finishing incremental GC because gcBytes > m_RuntimeSize / 2. \n");
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#endif
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PrepareContextsForIncrementalGC();
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JS::FinishIncrementalGC(m_rt, JS::gcreason::REFRESH_FRAME);
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}
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else
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{
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if (gcBytes > m_RuntimeSize * 0.75)
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{
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ShrinkingGC();
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#if GC_DEBUG_PRINT
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printf("Running shrinking GC because gcBytes > m_RuntimeSize * 0.75. \n");
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#endif
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}
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else
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{
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#if GC_DEBUG_PRINT
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printf("Running full GC because gcBytes > m_RuntimeSize / 2. \n");
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#endif
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JS_GC(m_rt);
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}
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}
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}
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else
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{
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#if GC_DEBUG_PRINT
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if (!JS::IsIncrementalGCInProgress(m_rt))
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printf("Starting incremental GC \n");
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else
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printf("Running incremental GC slice \n");
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#endif
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PrepareContextsForIncrementalGC();
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JS::IncrementalGC(m_rt, JS::gcreason::REFRESH_FRAME, GCSliceTimeBudget);
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}
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m_LastGCBytes = gcBytes;
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}
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}
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}
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void ScriptRuntime::ShrinkingGC()
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{
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JS_SetGCParameter(m_rt, JSGC_MODE, JSGC_MODE_COMPARTMENT);
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JS::PrepareForFullGC(m_rt);
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JS::ShrinkingGC(m_rt, JS::gcreason::REFRESH_FRAME);
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JS_SetGCParameter(m_rt, JSGC_MODE, JSGC_MODE_INCREMENTAL);
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}
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void* ScriptRuntime::jshook_script(JSContext* UNUSED(cx), JSAbstractFramePtr UNUSED(fp), bool UNUSED(isConstructing), bool before, bool* UNUSED(ok), void* closure)
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{
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if (before)
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g_Profiler.StartScript("script invocation");
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else
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g_Profiler.Stop();
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return closure;
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}
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void* ScriptRuntime::jshook_function(JSContext* cx, JSAbstractFramePtr fp, bool UNUSED(isConstructing), bool before, bool* UNUSED(ok), void* closure)
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{
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JSAutoRequest rq(cx);
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if (!before)
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{
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g_Profiler.Stop();
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return closure;
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}
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JS::RootedFunction fn(cx, fp.maybeFun());
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if (!fn)
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{
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g_Profiler.StartScript("(function)");
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return closure;
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}
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// Try to get the name of non-anonymous functions
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JS::RootedString name(cx, JS_GetFunctionId(fn));
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if (name)
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{
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char* chars = JS_EncodeString(cx, name);
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if (chars)
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{
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g_Profiler.StartScript(StringFlyweight(chars).get().c_str());
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JS_free(cx, chars);
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return closure;
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}
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}
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// No name - use fileName and line instead
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JS::AutoFilename fileName;
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unsigned lineno;
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JS::DescribeScriptedCaller(cx, &fileName, &lineno);
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std::stringstream ss;
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ss << "(" << fileName.get() << ":" << lineno << ")";
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g_Profiler.StartScript(StringFlyweight(ss.str()).get().c_str());
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return closure;
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}
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void ScriptRuntime::PrepareContextsForIncrementalGC()
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{
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for (JSContext* const& ctx : m_Contexts)
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JS::PrepareZoneForGC(js::GetCompartmentZone(js::GetContextCompartment(ctx)));
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}
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