зеркало из https://github.com/mozilla/pjs.git
JSActivation, JSFunction
This commit is contained in:
beard%netscape.com
Родитель
95604b5bff
Коммит
12ccc48ec4
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@ -42,6 +42,12 @@ using std::pair;
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typedef gc_allocator<JSValue> gc_map_allocator;
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#endif
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/**
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* Basic behavior of all JS objects, mapping a name to a value.
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* This is provided mainly to avoid having an awkward implementation
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* of JSObject & JSArray, which must each define its own
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* gc_allocator. This is all in flux.
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*/
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class JSMap {
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map<String, JSValue, less<String>, gc_map_allocator> properties;
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public:
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@ -106,24 +112,58 @@ private:
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}
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};
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class JSFunction : public JSMap, public gc_object<JSFunction> {
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ICodeModule* mICode;
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public:
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JSFunction(ICodeModule* iCode) : mICode(iCode) {}
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ICodeModule* getICode() { return mICode; }
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};
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/**
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* Represents the current function's invocation state.
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*/
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struct JSActivation : public gc_object<JSActivation> {
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JSValues mRegisters;
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JSValues mLocals;
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JSActivation(ICodeModule* iCode, const JSValues& args)
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: mRegisters(iCode->itsMaxRegister + 1), mLocals(args)
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{
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// ensure that locals array is large enough.
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uint32 localsSize = iCode->itsMaxVariable + 1;
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if (localsSize > mLocals.size())
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mLocals.resize(localsSize);
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}
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JSActivation(ICodeModule* iCode, JSActivation* caller, const RegisterList& list)
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: mRegisters(iCode->itsMaxRegister + 1), mLocals(iCode->itsMaxVariable + 1)
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{
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// copy caller's parameter list in to locals.
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JSValues::iterator dest = mLocals.begin();
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const JSValues& params = caller->mRegisters;
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for (RegisterList::const_iterator src = list.begin(), end = list.end(); src != end; ++src, ++dest) {
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*dest = params[*src];
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}
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}
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};
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/**
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* Stores saved state from the *previous* activation, the current activation is alive
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* and well in locals of the interpreter loop.
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*/
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struct JSFrame : public gc_object<JSFrame> {
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JSFrame(InstructionIterator returnPC, InstructionIterator basePC, JSArray *registers, JSArray *variables, Register result)
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: itsReturnPC(returnPC), itsBasePC(basePC), itsRegisters(registers), itsVariables(variables), itsResult(result) { }
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JSFrame(InstructionIterator returnPC, InstructionIterator basePC,
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JSActivation* activation, Register result)
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: itsReturnPC(returnPC), itsBasePC(basePC),
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itsActivation(activation),
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itsResult(result)
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{
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}
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InstructionIterator itsReturnPC;
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InstructionIterator itsBasePC;
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JSArray *itsRegisters; // rather not save these BUT:
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// - switch temps (and others eventually?) are live across statments
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// and need to be preserved.
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// - better debugging if intermediate state can be recovered (?)
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JSArray *itsVariables;
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JSActivation* itsActivation; // caller's activation.
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Register itsResult; // the desired target register for the return value
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};
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// a stack of JSFrames.
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@ -146,18 +186,25 @@ JSValue& defineGlobalProperty(const String& name, const JSValue& value)
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return (globals[name] = value);
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}
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// FIXME: need to copy the ICodeModule's instruction stream.
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JSValue& defineFunction(const String& name, ICodeModule* iCode)
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{
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JSValue value;
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value.function = new JSFunction(iCode);
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return defineGlobalProperty(name, value);
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}
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JSValue interpret(ICodeModule* iCode, const JSValues& args)
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{
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// stack of JSFrames.
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// XXX is a linked list of activation's sufficient?
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JSFrameStack frames;
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JSArray *locals = new JSArray(args);
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// ensure that locals array is large enough.
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uint32 localsSize = iCode->itsMaxVariable + 1;
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if (localsSize > locals->length())
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locals->resize(localsSize);
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JSArray *registers = new JSArray(iCode->itsMaxRegister + 1);
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// initial activation.
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JSActivation* activation = new JSActivation(iCode, args);
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JSValues* locals = &activation->mLocals;
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JSValues* registers = &activation->mRegisters;
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InstructionIterator begin_pc = iCode->its_iCode->begin();
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InstructionIterator pc = begin_pc;
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@ -168,15 +215,12 @@ JSValue interpret(ICodeModule* iCode, const JSValues& args)
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case CALL:
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{
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Call* call = static_cast<Call*>(instruction);
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JSArray *previousRegisters = registers;
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frames.push(new JSFrame(++pc, begin_pc, registers, locals, op1(call)));
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ICodeModule *tgt = (*registers)[op2(call)].icm;
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locals = new JSArray(tgt->itsMaxVariable + 1);
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registers = new JSArray(tgt->itsMaxRegister + 1);
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RegisterList args = op3(call);
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for (RegisterList::iterator r = args.begin(); r != args.end(); ++r)
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(*locals)[r - args.begin()] = (*previousRegisters)[(*r)];
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begin_pc = pc = tgt->its_iCode->begin();
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frames.push(new JSFrame(++pc, begin_pc, activation, op1(call)));
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ICodeModule* target = (*registers)[op2(call)].function->getICode();
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activation = new JSActivation(target, activation, op3(call));
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locals = &activation->mLocals;
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registers = &activation->mRegisters;
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begin_pc = pc = target->its_iCode->begin();
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}
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continue;
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case RETURN:
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@ -187,13 +231,14 @@ JSValue interpret(ICodeModule* iCode, const JSValues& args)
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result = (*registers)[op1(ret)];
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if (frames.empty())
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return result;
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JSFrame *fr = frames.top();
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JSFrame *frame = frames.top();
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frames.pop();
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registers = fr->itsRegisters;
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locals = fr->itsVariables;
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(*registers)[fr->itsResult] = result;
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pc = fr->itsReturnPC;
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begin_pc = fr->itsBasePC;
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activation = frame->itsActivation;
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registers = &activation->mRegisters;
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locals = &activation->mLocals;
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(*registers)[frame->itsResult] = result;
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pc = frame->itsReturnPC;
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begin_pc = frame->itsBasePC;
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}
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continue;
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case MOVE_TO:
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@ -42,6 +42,12 @@ using std::pair;
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typedef gc_allocator<JSValue> gc_map_allocator;
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#endif
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/**
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* Basic behavior of all JS objects, mapping a name to a value.
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* This is provided mainly to avoid having an awkward implementation
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* of JSObject & JSArray, which must each define its own
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* gc_allocator. This is all in flux.
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*/
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class JSMap {
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map<String, JSValue, less<String>, gc_map_allocator> properties;
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public:
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@ -106,24 +112,58 @@ private:
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}
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};
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class JSFunction : public JSMap, public gc_object<JSFunction> {
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ICodeModule* mICode;
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public:
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JSFunction(ICodeModule* iCode) : mICode(iCode) {}
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ICodeModule* getICode() { return mICode; }
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};
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/**
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* Represents the current function's invocation state.
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*/
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struct JSActivation : public gc_object<JSActivation> {
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JSValues mRegisters;
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JSValues mLocals;
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JSActivation(ICodeModule* iCode, const JSValues& args)
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: mRegisters(iCode->itsMaxRegister + 1), mLocals(args)
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{
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// ensure that locals array is large enough.
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uint32 localsSize = iCode->itsMaxVariable + 1;
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if (localsSize > mLocals.size())
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mLocals.resize(localsSize);
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}
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JSActivation(ICodeModule* iCode, JSActivation* caller, const RegisterList& list)
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: mRegisters(iCode->itsMaxRegister + 1), mLocals(iCode->itsMaxVariable + 1)
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{
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// copy caller's parameter list in to locals.
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JSValues::iterator dest = mLocals.begin();
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const JSValues& params = caller->mRegisters;
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for (RegisterList::const_iterator src = list.begin(), end = list.end(); src != end; ++src, ++dest) {
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*dest = params[*src];
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}
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}
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};
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/**
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* Stores saved state from the *previous* activation, the current activation is alive
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* and well in locals of the interpreter loop.
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*/
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struct JSFrame : public gc_object<JSFrame> {
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JSFrame(InstructionIterator returnPC, InstructionIterator basePC, JSArray *registers, JSArray *variables, Register result)
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: itsReturnPC(returnPC), itsBasePC(basePC), itsRegisters(registers), itsVariables(variables), itsResult(result) { }
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JSFrame(InstructionIterator returnPC, InstructionIterator basePC,
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JSActivation* activation, Register result)
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: itsReturnPC(returnPC), itsBasePC(basePC),
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itsActivation(activation),
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itsResult(result)
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{
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}
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InstructionIterator itsReturnPC;
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InstructionIterator itsBasePC;
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JSArray *itsRegisters; // rather not save these BUT:
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// - switch temps (and others eventually?) are live across statments
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// and need to be preserved.
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// - better debugging if intermediate state can be recovered (?)
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JSArray *itsVariables;
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JSActivation* itsActivation; // caller's activation.
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Register itsResult; // the desired target register for the return value
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};
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// a stack of JSFrames.
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@ -146,18 +186,25 @@ JSValue& defineGlobalProperty(const String& name, const JSValue& value)
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return (globals[name] = value);
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}
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// FIXME: need to copy the ICodeModule's instruction stream.
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JSValue& defineFunction(const String& name, ICodeModule* iCode)
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{
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JSValue value;
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value.function = new JSFunction(iCode);
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return defineGlobalProperty(name, value);
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}
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JSValue interpret(ICodeModule* iCode, const JSValues& args)
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{
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// stack of JSFrames.
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// XXX is a linked list of activation's sufficient?
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JSFrameStack frames;
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JSArray *locals = new JSArray(args);
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// ensure that locals array is large enough.
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uint32 localsSize = iCode->itsMaxVariable + 1;
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if (localsSize > locals->length())
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locals->resize(localsSize);
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JSArray *registers = new JSArray(iCode->itsMaxRegister + 1);
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// initial activation.
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JSActivation* activation = new JSActivation(iCode, args);
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JSValues* locals = &activation->mLocals;
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JSValues* registers = &activation->mRegisters;
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InstructionIterator begin_pc = iCode->its_iCode->begin();
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InstructionIterator pc = begin_pc;
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@ -168,15 +215,12 @@ JSValue interpret(ICodeModule* iCode, const JSValues& args)
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case CALL:
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{
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Call* call = static_cast<Call*>(instruction);
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JSArray *previousRegisters = registers;
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frames.push(new JSFrame(++pc, begin_pc, registers, locals, op1(call)));
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ICodeModule *tgt = (*registers)[op2(call)].icm;
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locals = new JSArray(tgt->itsMaxVariable + 1);
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registers = new JSArray(tgt->itsMaxRegister + 1);
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RegisterList args = op3(call);
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for (RegisterList::iterator r = args.begin(); r != args.end(); ++r)
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(*locals)[r - args.begin()] = (*previousRegisters)[(*r)];
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begin_pc = pc = tgt->its_iCode->begin();
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frames.push(new JSFrame(++pc, begin_pc, activation, op1(call)));
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ICodeModule* target = (*registers)[op2(call)].function->getICode();
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activation = new JSActivation(target, activation, op3(call));
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locals = &activation->mLocals;
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registers = &activation->mRegisters;
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begin_pc = pc = target->its_iCode->begin();
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}
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continue;
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case RETURN:
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@ -187,13 +231,14 @@ JSValue interpret(ICodeModule* iCode, const JSValues& args)
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result = (*registers)[op1(ret)];
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if (frames.empty())
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return result;
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JSFrame *fr = frames.top();
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JSFrame *frame = frames.top();
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frames.pop();
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registers = fr->itsRegisters;
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locals = fr->itsVariables;
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(*registers)[fr->itsResult] = result;
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pc = fr->itsReturnPC;
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begin_pc = fr->itsBasePC;
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activation = frame->itsActivation;
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registers = &activation->mRegisters;
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locals = &activation->mLocals;
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(*registers)[frame->itsResult] = result;
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pc = frame->itsReturnPC;
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begin_pc = frame->itsBasePC;
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}
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continue;
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case MOVE_TO:
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