Sean Cannella
269 linhas
9.6 KiB
C++
269 linhas
9.6 KiB
C++
/*
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+----------------------------------------------------------------------+
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| HipHop for PHP |
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+----------------------------------------------------------------------+
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| Copyright (c) 2010-2013 Facebook, Inc. (http://www.facebook.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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*/
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#ifndef incl_HPHP_VM_INSTANCE_H_
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#define incl_HPHP_VM_INSTANCE_H_
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#include "hphp/runtime/base/complex_types.h"
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#include "hphp/runtime/base/memory/smart_allocator.h"
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#include "hphp/runtime/base/array/array_init.h"
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#include "hphp/runtime/base/runtime_option.h"
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#include "hphp/runtime/base/array/hphp_array.h"
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#include "hphp/runtime/vm/class.h"
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#include "hphp/runtime/vm/unit.h"
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namespace HPHP {
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void deepInitHelper(TypedValue* propVec, const TypedValueAux* propData,
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size_t nProps);
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class Instance : public ObjectData {
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// Do not declare any fields directly in Instance; instead embed them in
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// ObjectData, so that a property vector can always reside immediately past
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// the end of an object.
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private:
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// This constructor is used for all pure classes that are not
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// descendents of cppext classes
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explicit Instance(Class* cls) : ObjectData(false, cls) {
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instanceInit(cls);
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}
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enum class NoInit { noinit };
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explicit Instance(Class* cls, NoInit) : ObjectData(false, cls) {}
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public:
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// This constructor is used for all cppext classes (including resources)
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// and their descendents.
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Instance(Class* cls, bool isResource)
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: ObjectData(isResource, cls) {
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instanceInit(cls);
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}
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virtual ~Instance() {}
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static int ObjAllocatorSizeClassCount;
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// Call newInstance() to instantiate an Instance
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static Instance* newInstance(Class* cls) {
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if (cls->m_InstanceCtor) {
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return cls->m_InstanceCtor(cls);
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}
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Attr attrs = cls->attrs();
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if (UNLIKELY(attrs & (AttrAbstract | AttrInterface | AttrTrait))) {
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raise_error("Cannot instantiate %s %s",
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(attrs & AttrInterface) ? "interface" :
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(attrs & AttrTrait) ? "trait" : "abstract class",
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cls->preClass()->name()->data());
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}
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size_t nProps = cls->numDeclProperties();
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size_t size = sizeForNProps(nProps);
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Instance* obj = (Instance*)ALLOCOBJSZ(size);
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new (obj) Instance(cls);
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if (UNLIKELY(cls->callsCustomInstanceInit())) {
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/*
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This must happen after the constructor finishes,
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because it can leak references to obj AND it can
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throw exceptions. If we have this in the Instance
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constructor, and it throws, obj will be partially
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destroyed (ie ~ObjectData will be called, resetting
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the vtable pointer) leaving dangling references
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to the object (eg in backtraces).
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*/
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obj->callCustomInstanceInit();
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}
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return obj;
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}
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// Given a Class that is assumed to be a concrete, regular (not a
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// trait or interface), pure PHP class, and an allocator index,
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// return a new, uninitialized object of that class.
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static Instance* newInstanceRaw(Class* cls, int idx);
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private:
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void instanceInit(Class* cls) {
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setAttributes(cls->getODAttrs());
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size_t nProps = cls->numDeclProperties();
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if (cls->needInitialization()) {
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cls->initialize();
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}
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if (nProps > 0) {
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if (cls->pinitVec().size() > 0) {
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const Class::PropInitVec* propInitVec = m_cls->getPropData();
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assert(propInitVec != nullptr);
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assert(nProps == propInitVec->size());
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if (!cls->hasDeepInitProps()) {
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memcpy(propVec(), &(*propInitVec)[0], nProps * sizeof(TypedValue));
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} else {
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deepInitHelper(propVec(), &(*propInitVec)[0], nProps);
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}
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} else {
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assert(nProps == cls->declPropInit().size());
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memcpy(propVec(), &cls->declPropInit()[0], nProps * sizeof(TypedValue));
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}
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}
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}
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protected:
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TypedValue* propVec();
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const TypedValue* propVec() const;
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public:
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Instance* callCustomInstanceInit();
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void operator delete(void* p) {
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Instance* this_ = (Instance*)p;
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Class* cls = this_->getVMClass();
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size_t nProps = cls->numDeclProperties();
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// cppext classes have their own implementation of delete
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assert(this_->builtinPropSize() == 0);
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TypedValue* propVec = (TypedValue *)((uintptr_t)this_ + sizeof(ObjectData));
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for (unsigned i = 0; i < nProps; ++i) {
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TypedValue* prop = &propVec[i];
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tvRefcountedDecRef(prop);
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}
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DELETEOBJSZ(sizeForNProps(nProps))(this_);
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}
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//============================================================================
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// Virtual ObjectData methods that we need to override
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public:
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virtual Variant t___destruct();
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virtual Variant t___call(Variant v_name, Variant v_arguments);
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virtual Variant t___set(Variant v_name, Variant v_value);
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virtual Variant t___get(Variant v_name);
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virtual bool t___isset(Variant v_name);
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virtual Variant t___unset(Variant v_name);
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virtual Variant t___sleep();
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virtual Variant t___wakeup();
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virtual Variant t___set_state(Variant v_properties);
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virtual String t___tostring();
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virtual Variant t___clone();
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//============================================================================
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// Miscellaneous.
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void cloneSet(ObjectData* clone);
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ObjectData* cloneImpl();
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void invokeUserMethod(TypedValue* retval, const Func* method,
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CArrRef params);
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const Func* methodNamed(const StringData* sd) const {
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return getVMClass()->lookupMethod(sd);
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}
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static size_t sizeForNProps(Slot nProps) {
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size_t sz = sizeof(Instance) + (sizeof(TypedValue) * nProps);
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assert((sz & (sizeof(TypedValue) - 1)) == 0);
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return sz;
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}
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static Object FromArray(ArrayData *properties);
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//============================================================================
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// Properties.
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public:
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int builtinPropSize() const {
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return m_cls->builtinPropSize();
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}
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// public for ObjectData access
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void initDynProps(int numDynamic = 0);
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Slot declPropInd(TypedValue* prop) const;
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private:
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template <bool declOnly>
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TypedValue* getPropImpl(Class* ctx, const StringData* key, bool& visible,
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bool& accessible, bool& unset);
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public:
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TypedValue* getProp(Class* ctx, const StringData* key, bool& visible,
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bool& accessible, bool& unset);
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TypedValue* getDeclProp(Class* ctx, const StringData* key, bool& visible,
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bool& accessible, bool& unset);
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private:
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template <bool warn, bool define>
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void propImpl(TypedValue*& retval, TypedValue& tvRef, Class* ctx,
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const StringData* key);
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void invokeSet(TypedValue* retval, const StringData* key, TypedValue* val);
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void invokeGet(TypedValue* retval, const StringData* key);
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void invokeGetProp(TypedValue*& retval, TypedValue& tvRef,
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const StringData* key);
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void invokeIsset(TypedValue* retval, const StringData* key);
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void invokeUnset(TypedValue* retval, const StringData* key);
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void getProp(const Class* klass, bool pubOnly, const PreClass::Prop* prop,
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Array& props, std::vector<bool>& inserted) const;
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void getProps(const Class* klass, bool pubOnly, const PreClass* pc,
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Array& props, std::vector<bool>& inserted) const;
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public:
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void prop(TypedValue*& retval, TypedValue& tvRef, Class* ctx,
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const StringData* key);
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void propD(TypedValue*& retval, TypedValue& tvRef, Class* ctx,
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const StringData* key);
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void propW(TypedValue*& retval, TypedValue& tvRef, Class* ctx,
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const StringData* key);
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void propWD(TypedValue*& retval, TypedValue& tvRef, Class* ctx,
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const StringData* key);
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bool propIsset(Class* ctx, const StringData* key);
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bool propEmpty(Class* ctx, const StringData* key);
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TypedValue* setProp(Class* ctx, const StringData* key, TypedValue* val,
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bool bindingAssignment = false);
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TypedValue* setOpProp(TypedValue& tvRef, Class* ctx, unsigned char op,
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const StringData* key, Cell* val);
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private:
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template <bool setResult>
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void incDecPropImpl(TypedValue& tvRef, Class* ctx, unsigned char op,
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const StringData* key, TypedValue& dest);
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public:
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template <bool setResult>
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void incDecProp(TypedValue& tvRef, Class* ctx, unsigned char op,
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const StringData* key, TypedValue& dest);
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void unsetProp(Class* ctx, const StringData* key);
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void raiseUndefProp(const StringData* name);
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friend class ObjectData;
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};
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inline Instance* instanceFromTv(TypedValue* tv) {
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assert(dynamic_cast<Instance*>(tv->m_data.pobj));
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return static_cast<Instance*>(tv->m_data.pobj);
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}
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} // HPHP::VM
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namespace HPHP {
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class ExtObjectData : public HPHP::Instance {
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public:
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explicit ExtObjectData(HPHP::Class* cls)
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: HPHP::Instance(cls, false) {
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assert(!m_cls->callsCustomInstanceInit());
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}
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};
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template <int flags> class ExtObjectDataFlags : public ExtObjectData {
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public:
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explicit ExtObjectDataFlags(HPHP::Class* cb) : ExtObjectData(cb) {
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ObjectData::setAttributes(flags);
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}
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};
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} // HPHP
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#endif
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