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first crack at an icode interpreter
This commit is contained in:
beard%netscape.com
parent
8394e82e58
commit
8283b89064
119
js/js2/interpreter.cpp
Normal file
119
js/js2/interpreter.cpp
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@ -0,0 +1,119 @@
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// -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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//
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// The contents of this file are subject to the Netscape Public
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// License Version 1.1 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of
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// the License at http://www.mozilla.org/NPL/
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//
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// Software distributed under the License is distributed on an "AS
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// IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
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// implied. See the License for the specific language governing
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// rights and limitations under the License.
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//
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// The Original Code is the JavaScript 2 Prototype.
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//
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// The Initial Developer of the Original Code is Netscape
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// Communications Corporation. Portions created by Netscape are
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// Copyright (C) 1998 Netscape Communications Corporation. All
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// Rights Reserved.
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#include "interpreter.h"
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namespace JS = JavaScript;
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namespace JS {
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// these should probably be in icodegenerator.h.
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typedef Instruction_2<StringAtom&, Register> LoadName;
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typedef Instruction_2<double, Register> LoadImmediate;
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typedef Instruction_2<int32, Register> LoadVar;
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typedef Instruction_2<int32, Register> SaveVar;
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typedef Instruction_1<int32> Branch;
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typedef Instruction_2<int32, Register> BranchCond;
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typedef Instruction_3<Register, Register, Register> Arithmetic;
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typedef Instruction_2<Register, Register> Move;
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#define op1(i) (i->itsOperand1)
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#define op2(i) (i->itsOperand2)
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#define op3(i) (i->itsOperand3)
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JSValue interpret(InstructionStream& iCode, const JSValues& args)
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{
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JSValue result = JSValue();
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JSValues frame(args);
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JSValues registers(32);
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for (InstructionIterator pc = iCode.begin(); pc != iCode.end(); ++pc) {
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Instruction* instruction = *pc;
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switch (instruction->itsOp) {
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case LOAD_NAME :
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{
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LoadName* i = static_cast<LoadName*>(instruction);
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std::cout << "\"" << op1(i) << "\", R" << op2(i);
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}
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break;
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case LOAD_IMMEDIATE :
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{
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LoadImmediate* i = static_cast<LoadImmediate*>(instruction);
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// s << t->itsOperand1 << ", R" << t->itsOperand2;
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registers[op2(i)] = JSValue(op1(i));
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}
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break;
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case LOAD_VAR:
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{
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LoadVar* i = static_cast<LoadVar*>(instruction);
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registers[op2(i)] = frame[op1(i)];
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}
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break;
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case SAVE_VAR:
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{
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SaveVar* i = static_cast<SaveVar*>(instruction);
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frame[op1(i)] = registers[op2(i)];
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}
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break;
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case BRANCH :
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{
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Branch* i = static_cast<Branch*>(instruction);
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pc = iCode.begin() + op1(i);
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}
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break;
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case BRANCH_COND :
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{
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BranchCond* i = static_cast<BranchCond*>(instruction);
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// s << "target #" << t->itsOperand1 << ", R" << t->itsOperand2;
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if (registers[op2(i)].i32)
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pc = iCode.begin() + op1(i);
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}
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break;
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case ADD:
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{
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// could get clever here with Functional forms.
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Arithmetic* i = static_cast<Arithmetic*>(instruction);
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registers[op3(i)] = JSValue(registers[op1(i)].f64 + registers[op2(i)].f64);
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}
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break;
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case COMPARE:
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{
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Arithmetic* i = static_cast<Arithmetic*>(instruction);
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registers[op3(i)].i32 = registers[op1(i)].f64 == registers[op2(i)].f64;
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}
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break;
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case MOVE_TO:
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{
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Move* i = static_cast<Move*>(instruction);
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registers[op2(i)] = registers[op1(i)];
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}
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break;
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case NOT:
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{
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Move* i = static_cast<Move*>(instruction);
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registers[op2(i)].i32 = !registers[op1(i)].i32;
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}
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break;
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}
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}
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return result;
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}
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}
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51
js/js2/interpreter.h
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51
js/js2/interpreter.h
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@ -0,0 +1,51 @@
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// -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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//
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// The contents of this file are subject to the Netscape Public
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// License Version 1.1 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of
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// the License at http://www.mozilla.org/NPL/
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//
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// Software distributed under the License is distributed on an "AS
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// IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
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// implied. See the License for the specific language governing
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// rights and limitations under the License.
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//
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// The Original Code is the JavaScript 2 Prototype.
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//
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// The Initial Developer of the Original Code is Netscape
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// Communications Corporation. Portions created by Netscape are
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// Copyright (C) 1998 Netscape Communications Corporation. All
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// Rights Reserved.
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#ifndef interpreter_h
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#define interpreter_h
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#include "icodegenerator.h"
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namespace JavaScript {
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union JSValue {
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int8 i8;
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uint8 u8;
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int16 i16;
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uint16 u16;
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int32 i32;
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uint32 u32;
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int64 i64;
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uint64 u64;
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float32 f32;
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float64 f64;
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JSValue() : i64(0) {}
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explicit JSValue(int8 i8) : i8(i8) {}
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explicit JSValue(float64 f64) : f64(f64) {}
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};
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using std::vector;
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typedef vector<JSValue> JSValues;
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JSValue interpret(InstructionStream& iCode, const JSValues& args);
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}
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#endif /* interpreter_h */
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119
js2/src/interpreter.cpp
Normal file
119
js2/src/interpreter.cpp
Normal file
@ -0,0 +1,119 @@
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// -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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//
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// The contents of this file are subject to the Netscape Public
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// License Version 1.1 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of
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// the License at http://www.mozilla.org/NPL/
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//
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// Software distributed under the License is distributed on an "AS
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// IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
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// implied. See the License for the specific language governing
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// rights and limitations under the License.
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//
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// The Original Code is the JavaScript 2 Prototype.
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//
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// The Initial Developer of the Original Code is Netscape
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// Communications Corporation. Portions created by Netscape are
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// Copyright (C) 1998 Netscape Communications Corporation. All
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// Rights Reserved.
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#include "interpreter.h"
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namespace JS = JavaScript;
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namespace JS {
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// these should probably be in icodegenerator.h.
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typedef Instruction_2<StringAtom&, Register> LoadName;
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typedef Instruction_2<double, Register> LoadImmediate;
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typedef Instruction_2<int32, Register> LoadVar;
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typedef Instruction_2<int32, Register> SaveVar;
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typedef Instruction_1<int32> Branch;
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typedef Instruction_2<int32, Register> BranchCond;
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typedef Instruction_3<Register, Register, Register> Arithmetic;
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typedef Instruction_2<Register, Register> Move;
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#define op1(i) (i->itsOperand1)
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#define op2(i) (i->itsOperand2)
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#define op3(i) (i->itsOperand3)
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JSValue interpret(InstructionStream& iCode, const JSValues& args)
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{
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JSValue result = JSValue();
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JSValues frame(args);
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JSValues registers(32);
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for (InstructionIterator pc = iCode.begin(); pc != iCode.end(); ++pc) {
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Instruction* instruction = *pc;
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switch (instruction->itsOp) {
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case LOAD_NAME :
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{
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LoadName* i = static_cast<LoadName*>(instruction);
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std::cout << "\"" << op1(i) << "\", R" << op2(i);
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}
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break;
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case LOAD_IMMEDIATE :
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{
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LoadImmediate* i = static_cast<LoadImmediate*>(instruction);
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// s << t->itsOperand1 << ", R" << t->itsOperand2;
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registers[op2(i)] = JSValue(op1(i));
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}
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break;
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case LOAD_VAR:
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{
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LoadVar* i = static_cast<LoadVar*>(instruction);
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registers[op2(i)] = frame[op1(i)];
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}
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break;
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case SAVE_VAR:
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{
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SaveVar* i = static_cast<SaveVar*>(instruction);
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frame[op1(i)] = registers[op2(i)];
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}
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break;
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case BRANCH :
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{
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Branch* i = static_cast<Branch*>(instruction);
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pc = iCode.begin() + op1(i);
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}
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break;
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case BRANCH_COND :
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{
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BranchCond* i = static_cast<BranchCond*>(instruction);
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// s << "target #" << t->itsOperand1 << ", R" << t->itsOperand2;
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if (registers[op2(i)].i32)
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pc = iCode.begin() + op1(i);
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}
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break;
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case ADD:
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{
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// could get clever here with Functional forms.
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Arithmetic* i = static_cast<Arithmetic*>(instruction);
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registers[op3(i)] = JSValue(registers[op1(i)].f64 + registers[op2(i)].f64);
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}
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break;
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case COMPARE:
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{
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Arithmetic* i = static_cast<Arithmetic*>(instruction);
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registers[op3(i)].i32 = registers[op1(i)].f64 == registers[op2(i)].f64;
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}
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break;
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case MOVE_TO:
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{
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Move* i = static_cast<Move*>(instruction);
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registers[op2(i)] = registers[op1(i)];
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}
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break;
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case NOT:
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{
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Move* i = static_cast<Move*>(instruction);
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registers[op2(i)].i32 = !registers[op1(i)].i32;
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}
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break;
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}
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}
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return result;
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}
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}
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51
js2/src/interpreter.h
Normal file
51
js2/src/interpreter.h
Normal file
@ -0,0 +1,51 @@
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// -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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//
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// The contents of this file are subject to the Netscape Public
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// License Version 1.1 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of
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// the License at http://www.mozilla.org/NPL/
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//
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// Software distributed under the License is distributed on an "AS
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// IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
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// implied. See the License for the specific language governing
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// rights and limitations under the License.
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//
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// The Original Code is the JavaScript 2 Prototype.
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//
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// The Initial Developer of the Original Code is Netscape
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// Communications Corporation. Portions created by Netscape are
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// Copyright (C) 1998 Netscape Communications Corporation. All
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// Rights Reserved.
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#ifndef interpreter_h
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#define interpreter_h
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#include "icodegenerator.h"
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namespace JavaScript {
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union JSValue {
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int8 i8;
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uint8 u8;
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int16 i16;
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uint16 u16;
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int32 i32;
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uint32 u32;
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int64 i64;
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uint64 u64;
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float32 f32;
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float64 f64;
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JSValue() : i64(0) {}
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explicit JSValue(int8 i8) : i8(i8) {}
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explicit JSValue(float64 f64) : f64(f64) {}
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};
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using std::vector;
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typedef vector<JSValue> JSValues;
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JSValue interpret(InstructionStream& iCode, const JSValues& args);
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}
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#endif /* interpreter_h */
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