+++ /dev/null
-// Copyright 2004 Adam Megacz, see the COPYING file for licensing [GPL]
-package org.ibex.js;
-
-/**
- * Constants for the various JavaScript ByteCode operations.
- *
- * Each instruction is an opcode and an optional literal literal;
- * some Tokens are also valid; see Tokens.java
- */
-interface ByteCodes {
-
- /** push the literal onto the stack */
- public static final byte LITERAL = -2;
-
- /** push a new array onto the stack with length equal to the literal */
- public static final byte ARRAY = -3;
-
- /** push an empty object onto the stack */
- public static final byte OBJECT = -4;
-
- /** create a new instance; literal is a reference to the corresponding ForthBlock */
- public static final byte NEWFUNCTION = -5;
-
- /** if given a non-null argument declare its argument in the current scope and push
- it to the stack, else, declares the element on the top of the stack and leaves it
- there */
- //public static final byte DECLARE = -6;
-
- /** push a reference to the current scope onto the stack */
- // FIXME: Document this
- public static final byte GLOBALSCOPE = -7;
-
- /** if given a null literal pop two elements off the stack; push stack[-1].get(stack[top])
- else pop one element off the stack, push stack[top].get(literal) */
- public static final byte GET = -8;
-
- /** push stack[-1].get(stack[top]) */
- public static final byte GET_PRESERVE = -9;
-
- /** pop two elements off the stack; stack[-2].put(stack[-1], stack[top]); push stack[top] */
- public static final byte PUT = -10;
-
- /** literal is a relative address; pop stacktop and jump if the value is true */
- public static final byte JT = -11;
-
- /** literal is a relative address; pop stacktop and jump if the value is false */
- public static final byte JF = -12;
-
- /** literal is a relative address; jump to it */
- public static final byte JMP = -13;
-
- /** discard the top stack element */
- static public final byte POP = -14;
-
- /** pop element; call stack[top](stack[-n], stack[-n+1]...) where n is the number of args to the function */
- public static final byte CALL = -15;
-
- /** pop an element; push a JS.JSArray containing the keys of the popped element */
- public static final byte PUSHKEYS = -16;
-
- /** push the top element down so that (arg) elements are on top of it; all other elements retain ordering */
- public static final byte SWAP = -17;
-
- /** execute the bytecode block pointed to by the literal in a fresh scope with parentScope==THIS */
- public static final byte NEWSCOPE = -18;
-
- /** execute the bytecode block pointed to by the literal in a fresh scope with parentScope==THIS */
- public static final byte OLDSCOPE = -19;
-
- /** push a copy of the top stack element */
- public static final byte DUP = -20;
-
- /** a NOP; confers a label upon the following instruction */
- public static final byte LABEL = -21;
-
- /** execute the ForthBlock pointed to by the literal until BREAK encountered; push TRUE onto the stack for the first iteration
- * and FALSE for all subsequent iterations */
- public static final byte LOOP = -22;
-
- /** similar effect a a GET followed by a CALL */
- public static final byte CALLMETHOD = -23;
-
- /** finish a finally block and carry out whatever instruction initiated the finally block */
- public static final byte FINALLY_DONE = -24;
-
- /** finish a finally block and carry out whatever instruction initiated the finally block */
- public static final byte MAKE_GRAMMAR = -25;
-
- // FIXME: Document these and NEWSCOPE/OLDSCOPE/TOPSCOPE changes
- public static final byte SCOPEGET = -26;
- public static final byte SCOPEPUT = -27;
-
- public static final String[] bytecodeToString = new String[] {
- "", "", "LITERAL", "ARRAY", "OBJECT", "NEWFUNCTION", "DECLARE", "GLOBALSCOPE",
- "GET", "GET_PRESERVE", "PUT", "JT", "JF", "JMP", "POP", "CALL", "PUSHKEYS",
- "SWAP", "NEWSCOPE", "OLDSCOPE", "DUP", "LABEL", "LOOP", "CALLMETHOD",
- "FINALLY_DONE", "MAKE_GRAMMAR", "SCOPEGET", "SCOPEPUT"
- };
-}