зеркало из https://github.com/mozilla/gecko-dev.git
377 строки
11 KiB
C++
377 строки
11 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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// NativeCodeCache
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//
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// Scott M. Silver
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//
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#include "NativeCodeCache.h"
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#include "StringUtils.h"
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#include "ClassWorld.h"
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#include "FieldOrMethod.h"
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#include "NativeMethodDispatcher.h"
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#include "JavaVM.h"
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UT_DEFINE_LOG_MODULE(NativeCodeCache);
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#ifdef _WIN32
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Uint8* CacheEntry::asynchVersion(Pool& pool, Uint8*& ip)
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{
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Uint8* src = start.getFunctionAddress();
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Int32 sz = end-src;
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Uint8* dest = new(pool) Uint8[sz];
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Uint32* asynchPoints = eTable->getAsynchPoints();
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int numberofAPoints = eTable->getNrOfAsynchPoints();
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// loop through code and for each byte corresponding to an asynchronous
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// checkpoint, insert 'int 3' (0xCC).
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memcpy((void*)dest,(const void*)src,sz);
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for (int j=0; j<numberofAPoints; j++)
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dest[asynchPoints[j]] = 0xcc;
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ip = dest + (ip-src);
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return dest;
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}
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#else
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Uint8* CacheEntry::asynchVersion(Pool& /*pool*/, Uint8*& /*ip*/)
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{
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assert(false);
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return NULL;
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}
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#endif
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// there is one of these per VM instantiation
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NativeCodeCache NativeCodeCache::sNativeCodeCache;
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// Access to the database of classes
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extern ClassWorld world;
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#ifdef DEBUG_LOG
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static void printFrame(Method *method);
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#endif
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// acquireMemory
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//
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// Reserve inBytes of data for (potentially) a new method, or data
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Uint8* NativeCodeCache::
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acquireMemory(const size_t inBytes)
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{
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// is Pool new thread safe?
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return ((Uint8*) new(mPool) char[inBytes]);
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}
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// mapMemoryToMethod
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//
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// Assign a "name" to a method. When other users ask the cache
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// for a given method, this is the entry point returned. The
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// first call for a specific MethodDescriptor M and function f,
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// will assign f to M.
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//
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// FIX-ME do all HashTable entrypoints need monitors?
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void NativeCodeCache::
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mapMemoryToMethod( const MethodDescriptor& inMethodDescriptor,
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PlatformTVector inWhere,
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Uint8* inEnd,
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ExceptionTable* pExceptionTable,
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StackFrameInfo& inPolicy)
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{
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CacheEntry* existingEntry = NULL;
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TemporaryStringCopy key(inMethodDescriptor.method->toString());
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mIndexByDescriptor.get(key, &existingEntry);
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if (!existingEntry)
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{
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CacheEntry& cacheEntry = *new(mPool) CacheEntry(inMethodDescriptor);
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cacheEntry.start = inWhere;
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cacheEntry.end = inEnd;
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cacheEntry.eTable = pExceptionTable;
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cacheEntry.policy = inPolicy;
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mIndexByDescriptor.add(key, &cacheEntry);
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mIndexByRange.append(&cacheEntry);
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}
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else
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{
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existingEntry->start = inWhere;
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existingEntry->end = inEnd;
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existingEntry->eTable = pExceptionTable;
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existingEntry->policy = inPolicy;
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}
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}
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// lookupByRange
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//
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// Purpose: used for stack crawling / debugging purposes
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// In: pointer to memory
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// Out: pointer to cache entry if in code cache (NULL otherwise)
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//
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// Notes: currently we do a linear search of a vector of methods, eventually
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// we'll want a better search strategy
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CacheEntry* NativeCodeCache::
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lookupByRange(Uint8* inAddress)
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{
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for(CacheEntry** ce= mIndexByRange.begin(); ce < mIndexByRange.end(); ce++)
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{
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#ifdef GENERATE_FOR_X86
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if ((*ce)->stub <= inAddress && (*ce)->stub + 10 > inAddress)
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return *ce;
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else
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#endif
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if(((*ce)->start.getFunctionAddress() <= inAddress) && (inAddress < (*ce)->end))
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return *ce;
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}
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return NULL;
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}
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// lookupByDescriptor
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//
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// Looks up method inMethodDescriptor, if inMethodDescriptor
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// is not in the cache, this generates a new "stub" function
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// (which will compile inMethodDescriptor and backpatch the caller)
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// Since we have two entries in the CacheEntry, one for stub and
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// the other for function, we return the function if it exists
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// otherwise we return the stub.
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// inLookupOnly - do not create a stub if the lookup fails
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addr NativeCodeCache::
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lookupByDescriptor(const MethodDescriptor& inMethodDescriptor, bool /*inhibitBackpatch*/, bool inLookupOnly)
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{
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Method *method = inMethodDescriptor.method;
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TemporaryStringCopy key(method->toString());
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CacheEntry* cacheEntry = NULL;
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mIndexByDescriptor.get(key, &cacheEntry);
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// short circuit if inLookupOnly
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if (inLookupOnly && !cacheEntry)
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return (functionAddress(NULL));
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if (!cacheEntry)
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{
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CacheEntry& newEntry = *new(mPool) CacheEntry(inMethodDescriptor);
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newEntry.stub = (unsigned char*) generateCompileStub(*this, newEntry);
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newEntry.start.setTVector(NULL);
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newEntry.end = NULL;
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newEntry.eTable = NULL;
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// FIX set shouldBackPatch to always false. Note that this
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// means that we compile evry function every time
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newEntry.shouldBackPatch = false;
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//newEntry.shouldBackPatch = !method->getDynamicallyDispatched();
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cacheEntry = &newEntry;
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mIndexByDescriptor.add(key, cacheEntry);
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mIndexByRange.append(cacheEntry);
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}
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bool inhibitBackpatching = false;
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inhibitBackpatching = VM::theVM.getInhibitBackpatching();
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if (cacheEntry->start.getFunctionAddress() && !inhibitBackpatching)
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return (functionAddress((void (*)())cacheEntry->start.getFunctionAddress()));
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else
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{
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if (!cacheEntry->stub)
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cacheEntry->stub = (unsigned char*) generateCompileStub(*this, *cacheEntry);
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return (functionAddress((void (*)())cacheEntry->stub));
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}
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}
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UT_DEFINE_LOG_MODULE(NativeCodeCacheMonitor);
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// compileOrLoadMethod
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//
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// If the method pointed to by inCacheEntry is a native method, resolve and load
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// the native code library. Otherwise compile the method's bytecode into
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// native code. Either way, return a pointer to the resulting native code.
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// Sets shouldBackPatch to true if it is neccessary to back-patch the method.
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static void*
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compileOrLoadMethod(const CacheEntry* inCacheEntry, bool &shouldBackPatch)
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{
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Method* method;
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// if this function is already compiled then just return it
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if (inCacheEntry->start.getFunctionAddress() != NULL)
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{
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shouldBackPatch = inCacheEntry->shouldBackPatch;
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goto ExitReturnFunc;
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}
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else
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{
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NativeCodeCache::enter();
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// maybe we slept while someone else was compiling, if so
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// don't do any work.
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if (inCacheEntry->start.getFunctionAddress() != NULL) {
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NativeCodeCache::exit();
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goto ExitReturnFunc;
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}
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method = inCacheEntry->descriptor.method;
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// If this is a native method, then resolve it appropriately
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if (method->getModifiers() & CR_METHOD_NATIVE)
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{
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addr a = NativeMethodDispatcher::resolve(*method);
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if (!a)
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{
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NativeCodeCache::exit();
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UT_LOG(NativeCodeCache, PR_LOG_ERROR, ("\tCould not resolve native method %s\n", method->getName()));
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runtimeError(RuntimeError::linkError);
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}
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else
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UT_LOG(NativeCodeCache, PR_LOG_DEBUG, ("\tResolved native method %s\n", method->getName()));
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NativeCodeCache &cache = NativeCodeCache::getCache();
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void* code = generateNativeStub(cache, *inCacheEntry, addressFunction(a));
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PlatformTVector tVector;
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tVector.setTVector((Uint8*)code);
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int codeLength = 0; // We don't know the length of native methods yet
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/*ExceptionTable* pExceptionTable = NULL; */ // FIX native methods don't have exception tables yet
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StackFrameInfo policy; // FIX we don't know the stack layout policies yet, so pass in junk
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cache.mapMemoryToMethod(inCacheEntry->descriptor, tVector, (Uint8*)code + codeLength, NULL, policy);
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}
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else
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method->compile();
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NativeCodeCache::exit();
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}
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ExitReturnFunc:
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assert(inCacheEntry->start.getFunctionAddress());
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shouldBackPatch = inCacheEntry->shouldBackPatch;
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EventBroadcaster::broadcastEvent(gCompileOrLoadBroadcaster, kEndCompileOrLoad, inCacheEntry->descriptor.method);
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return (inCacheEntry->start.getFunctionAddress());
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/*
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ExitMonitorThrowCompileException:
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PR_CExitMonitor((void*)inCacheEntry);
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assert(false);
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return (NULL);
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*/
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}
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// compileAndBackPatchMethod
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//
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// compile the method pointed to by inCacheEntry and then back patch
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// the caller.
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//
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// inLastPC = address of next native instruction to be executed
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// if the callee executed and returned. (where callee is the method that
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// is to be compiled)
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extern "C" void*
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compileAndBackPatchMethod(const CacheEntry* inCacheEntry, void* inLastPC, void* inUserDefined)
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{
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bool shouldBackPatch;
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void *nativeCode = compileOrLoadMethod(inCacheEntry, shouldBackPatch);
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if (VM::theVM.getInhibitBackpatching())
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shouldBackPatch = false;
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#ifdef DEBUG
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if (VM::theVM.getTraceAllMethods())
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{
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Method *method = inCacheEntry->descriptor.method;
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printFrame(method);
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}
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#endif
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/* Back-patch method only if method was resolved statically */
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return (shouldBackPatch) ?
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(backPatchMethod(nativeCode, inLastPC, inUserDefined)) : nativeCode;
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}
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#ifdef DEBUG_LOG
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// C-entry point so we can call this from
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// the MSVC debugger
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void NS_EXTERN
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printMethodTable()
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{
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NativeCodeCache::getCache().printMethodTable(UT_LOG_MODULE(NativeCodeCache));
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}
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// printMethodTable
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//
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// Print out all the methods currently in the cache, with their
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// ExceptionTables
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void NativeCodeCache::
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printMethodTable(LogModuleObject &f)
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{
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UT_OBJECTLOG(f, PR_LOG_ALWAYS, ("\n__________________Method Table___________________\n"));
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for(CacheEntry** ce= mIndexByRange.begin(); ce < mIndexByRange.end(); ce++)
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{
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Uint8* pStart = (*ce)->start.getFunctionAddress();
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Uint8* pEnd = (*ce)->end;
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const char* pName= (*ce)->descriptor.method->toString();
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ExceptionTable* eTable= (*ce)->eTable;
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UT_OBJECTLOG(f, PR_LOG_ALWAYS, ("[%#010x-%#010x] %s\n", Uint32(pStart), Uint32(pEnd), pName));
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if(eTable)
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eTable->printShort(f);
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UT_OBJECTLOG(f, PR_LOG_ALWAYS, ("\n"));
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}
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UT_OBJECTLOG(f, PR_LOG_ALWAYS, ("\n\n"));
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}
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UT_EXTERN_LOG_MODULE(StackWalker);
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#include "StackWalker.h"
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// printFrame
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//
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// Print a frame of a given method (which is
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// the caller). This can be called from a debugger
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static void printFrame(Method *method)
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{
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UT_SET_LOG_LEVEL(StackWalker, PR_LOG_DEBUG);
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Frame frame;
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frame.moveToPrevFrame();
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frame.moveToPrevFrame();
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// Indent the frame according to stack depth
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int stackDepth = Frame::getStackDepth();
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int i;
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// Discount the stack frames used for internal EF native code
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stackDepth -= 7;
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if (stackDepth < 0)
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stackDepth = 0;
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for (i = 0; i < stackDepth; i++)
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UT_LOG(StackWalker, PR_LOG_ALWAYS, (" "));
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Frame::printWithArgs(UT_LOG_MODULE(StackWalker), (Uint8*)(frame.getBase()), method);
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UT_LOG(StackWalker, PR_LOG_ALWAYS, ("\n"));
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UT_LOG_MODULE(StackWalker).flushLogFile();
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}
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#endif // DEBUG_LOG
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