mass rename and rebranding from xwt to ibex - fixed to use ixt files

[org.ibex.core.git] / src / org / ibex / js / JSFunction.java

diff --git a/src/org/ibex/js/JSFunction.java b/src/org/ibex/js/JSFunction.java
new file mode 100644 (file)
index 0000000..6c0e89a
--- /dev/null
+++ b/src/org/ibex/js/JSFunction.java
@@ -0,0 +1,132 @@
+// Copyright 2004 Adam Megacz, see the COPYING file for licensing [GPL]
+package org.ibex.js;
+
+import java.io.*;
+
+/** A JavaScript function, compiled into bytecode */
+class JSFunction extends JS implements ByteCodes, Tokens, org.ibex.Scheduler.Task {
+
+
+    // Fields and Accessors ///////////////////////////////////////////////
+
+    int numFormalArgs = 0;         ///< the number of formal arguments
+
+    String sourceName;             ///< the source code file that this block was drawn from
+    private int firstLine = -1;    ///< the first line of this script
+
+    int[] line = new int[10];      ///< the line numbers
+    int[] op = new int[10];        ///< the instructions
+    Object[] arg = new Object[10]; ///< the arguments to the instructions
+    int size = 0;                  ///< the number of instruction/argument pairs
+
+    JSScope parentScope;           ///< the default scope to use as a parent scope when executing this
+
+
+    // Public //////////////////////////////////////////////////////////////////////////////
+
+    // FEATURE: make sure that this can only be called from the Scheduler...
+    /** if you enqueue a function, it gets invoked in its own pauseable context */
+    public void perform() throws JSExn {
+        Interpreter i = new Interpreter(this, true, new JSArray());
+        int oldpausecount = i.pausecount;
+        i.resume();
+    }
+
+    /** parse and compile a function */
+    public static JSFunction _fromReader(String sourceName, int firstLine, Reader sourceCode) throws IOException {
+        JSFunction ret = new JSFunction(sourceName, firstLine, null);
+        if (sourceCode == null) return ret;
+        Parser p = new Parser(sourceCode, sourceName, firstLine);
+        while(true) {
+            int s = ret.size;
+            p.parseStatement(ret, null);
+            if (s == ret.size) break;
+        }
+        ret.add(-1, LITERAL, null); 
+        ret.add(-1, RETURN);
+        return ret;
+    }
+
+    public JSFunction _cloneWithNewParentScope(JSScope s) {
+        JSFunction ret = new JSFunction(sourceName, firstLine, s);
+        // Reuse the same op, arg, line, and size variables for the new "instance" of the function
+        // NOTE: Neither *this* function nor the new function should be modified after this call
+        ret.op = this.op;
+        ret.arg = this.arg;
+        ret.line = this.line;
+        ret.size = this.size;
+        ret.numFormalArgs = this.numFormalArgs;
+        return ret;
+    }
+
+    /** Note: code gets run in an <i>unpauseable</i> context. */
+    public Object call(Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
+        JSArray args = new JSArray();
+        if (nargs > 0) args.addElement(a0);
+        if (nargs > 1) args.addElement(a1);
+        if (nargs > 2) args.addElement(a2);
+        for(int i=3; i<nargs; i++) args.addElement(rest[i-3]);
+        Interpreter cx = new Interpreter(this, false, args);
+        return cx.resume();
+    }
+
+    public JSScope getParentScope() { return parentScope; }
+
+    // Adding and Altering Bytecodes ///////////////////////////////////////////////////
+
+    JSFunction(String sourceName, int firstLine, JSScope parentScope) {
+        this.sourceName = sourceName;
+        this.firstLine = firstLine;
+        this.parentScope = parentScope;
+    }
+
+    int get(int pos) { return op[pos]; }
+    Object getArg(int pos) { return arg[pos]; }
+    void set(int pos, int op_, Object arg_) { op[pos] = op_; arg[pos] = arg_; }
+    void set(int pos, Object arg_) { arg[pos] = arg_; }
+    int pop() { size--; arg[size] = null; return op[size]; }
+    void paste(JSFunction other) { for(int i=0; i<other.size; i++) add(other.line[i], other.op[i], other.arg[i]); }
+    JSFunction add(int line, int op_) { return add(line, op_, null); }
+    JSFunction add(int line, int op_, Object arg_) {
+        if (size == op.length - 1) {
+            int[] line2 = new int[op.length * 2]; System.arraycopy(this.line, 0, line2, 0, op.length); this.line = line2;
+            Object[] arg2 = new Object[op.length * 2]; System.arraycopy(arg, 0, arg2, 0, arg.length); arg = arg2;
+            int[] op2 = new int[op.length * 2]; System.arraycopy(op, 0, op2, 0, op.length); op = op2;
+        }
+        this.line[size] = line;
+        op[size] = op_;
+        arg[size] = arg_;
+        size++;
+        return this;
+    }
+    
+
+    // Debugging //////////////////////////////////////////////////////////////////////
+
+    public String toString() { return "JSFunction [" + sourceName + ":" + firstLine + "]"; }
+
+    public String dump() {
+        StringBuffer sb = new StringBuffer(1024);
+        sb.append("\n" + sourceName + ": " + firstLine + "\n");
+        for (int i=0; i < size; i++) {
+            sb.append(i);
+            sb.append(": ");
+            if (op[i] < 0) sb.append(bytecodeToString[-op[i]]);
+            else sb.append(codeToString[op[i]]);
+            sb.append(" ");
+            sb.append(arg[i] == null ? "(no arg)" : arg[i]);
+            if((op[i] == JF || op[i] == JT || op[i] == JMP) && arg[i] != null && arg[i] instanceof Number) {
+                sb.append(" jump to ").append(i+((Number) arg[i]).intValue());
+            } else  if(op[i] == TRY) {
+                int[] jmps = (int[]) arg[i];
+                sb.append(" catch: ").append(jmps[0] < 0 ? "No catch block" : ""+(i+jmps[0]));
+                sb.append(" finally: ").append(jmps[1] < 0 ? "No finally block" : ""+(i+jmps[1]));
+            }
+            sb.append("\n");
+        }
+        return sb.toString();
+    } 
+
+
+}
+