constant pool structure finished
This commit is contained in:
Artur Ventura
parent
1e5fd9944a
commit
50b18121b3
165
constantPool.js
165
constantPool.js
@ -10,49 +10,158 @@ var CONSTANT_Double = 6;
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var CONSTANT_NameAndType = 12;
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var CONSTANT_Utf8 = 1;
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constUtf8 = function(){
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// constant pool members
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var constUtf8 = function(){
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this.str = null;
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this.read = ( dStream ) {
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StringBuffer strBuf;
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int len, charCnt;
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byte one_byte;
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char one_char;
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this.id = CONSTANT_Utf8;
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this.read = function ( dStream ) {
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var strBuf;
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var len, charCnt;
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var one_byte;
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var one_char;
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one_char = '\u0000';
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len = readU2( dStream );
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strBuf = new StringBuffer();
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len = dStream.getU2();
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strBuf = "";
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charCnt = 0;
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while (charCnt < len) {
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one_byte = (byte)readU1( dStream );
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one_byte = dStream .getU1();
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charCnt++;
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if ((one_byte >> 7) == 1) {
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short tmp;
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var tmp;
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// its a multi-byte character
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tmp = (short)(one_byte & 0x3f); // Bits 5..0 (six bits)
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tmp = (one_byte & 0x3f); // Bits 5..0 (six bits)
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// read the next byte
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one_byte = (byte)readU1( dStream );
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one_byte = dStream .getU1();
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charCnt++;
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tmp = (short)(tmp | ((one_byte & 0x3f) << 6));
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tmp = (tmp | ((one_byte & 0x3f) << 6));
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if ((one_byte >> 6) == 0x2) {
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// We have 12 bits so far, get bits 15..12
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one_byte = (byte)readU1( dStream );
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one_byte = dStream .getU1();
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charCnt++;
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one_byte = (byte)(one_byte & 0xf);
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tmp = (short)(tmp | (one_byte << 12));
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one_byte = (one_byte & 0xf);
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tmp = (tmp | (one_byte << 12));
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}
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one_char = (char)tmp;
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one_char = tmp;
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}
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else {
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one_char = (char)one_byte;
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one_char = one_byte;
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}
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strBuf.append(one_char);
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strBuf += String.fromCharCode(one_char);
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} // while
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this.str = strBuf.toString();
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this.str = strBuf.toString();
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} // read
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return this;
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};
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allocConstEntry = function(tag){
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var constDummy = function(){
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this.read = function (stream){};
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return this;
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}
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var constInt = function(){
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this.value = null;
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this.id = CONSTANT_Integer;
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this.read = function ( dSStream ){
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this.value = dStream.getU4();
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}
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};
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var constFloat = function(){
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this.value = null;
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this.id = CONSTANT_Float;
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this.read = function ( dSStream ){
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this.value = dStream.getU4();
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}
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};
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var constLong = function(){
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this.high = null;
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this.low = null;
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this.id = CONSTANT_Long;
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this.read = function (dStream){
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this.high = dStream.getU4();
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this.low = dStream.getU4();
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}
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};
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var constDouble = function(){
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this.high = null;
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this.low = null;
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this.id = CONSTANT_Double;
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this.read = function (dStream){
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this.high = dStream.getU4();
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this.low = dStream.getU4();
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}
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};
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var constClass = function(){
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this.name_index = null;
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this.id = CONSTANT_Class;
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this.read = function(dStream){
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this.name_index = dstream.getU2();
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}
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};
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var constString = function(){
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this.string_index = null;
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this.id = CONSTANT_String;
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this.read = function(dStream){
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this.string_index = dstream.getU2();
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}
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};
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var constString = function(){
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this.string_index = null;
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this.id = CONSTANT_String;
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this.read = function(dStream){
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this.string_index = dstream.getU2();
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}
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};
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var constRef = function(){
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this.class_index = null;
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this.name_and_type_index = null;
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this.read = function(dStream){
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this.class_index = dStream.getU2();
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this.name_and_type_index = dStream.getU2();
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};
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};
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var constFieldRef = function(){
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var temp = new constRef();
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temp.id = CONSTANT_Fieldref;
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return temp;
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};
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var constMethodRef = function(){
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var temp = new constRef();
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temp.id = CONSTANT_Methodref;
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return temp;
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};
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var constInterfaceMethodRef = function(){
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var temp = new constRef();
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temp.id = CONSTANT_InterfaceMethodref;
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return temp;
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};
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var constName_and_Type_info = function(){
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this.name_index = null;
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this.descriptor_index = null;
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this.id = CONSTANT_NameAndType;
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this.read = function(dStream){
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this.name_index = dStream.getU2();
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this.descriptor_index = dStream.getU2();
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};
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}
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var allocConstEntry = function(tag){
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var obj = null;
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switch ( tag ) {
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@ -72,19 +181,27 @@ allocConstEntry = function(tag){
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obj = new constDouble();
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break;
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case CONSTANT_Class:
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obj = new constClass();
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break;
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case CONSTANT_String:
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obj = new constClass_or_String();
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obj = new constString();
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break;
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case CONSTANT_Fieldref:
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obj = new constFieldRef();
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break;
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case CONSTANT_Methodref:
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obj = new constMethodRef();
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break;
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case CONSTANT_InterfaceMethodref:
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obj = new constRef();
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obj = new constInterfaceMethodRef();
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break;
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case CONSTANT_NameAndType:
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obj = new constName_and_Type_info();
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break;
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default:
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System.out.println("allocConstEntry: bad tag value = " + tag);
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obj = new constDummy();
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//throw "allocConstEntry: bad tag value = " + tag;
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break;
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} // switch
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return obj;
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}
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@ -2,6 +2,12 @@
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<head>
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<title>JS JVM</title>
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<script src="preload.js" type="text/javascript"></script>
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<script>
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write = function(msg){
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var l = document.getElementById("log");
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l.innerHTML = l.innerHTML + msg + "\n";
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}
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</script>
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<script src="main.js" type="text/javascript"></script>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<style>
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@ -29,5 +35,6 @@
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<body onload="main()">
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<h1>JS JVM</h1>
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Open JavaScript Debug Window to read the debug;
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<pre id="log"></pre>
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</body>
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</html>
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@ -1,47 +1,73 @@
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DataStream = function(data){
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var DataStream = function(data){
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this.i = 0;
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this.getU = function(size){
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switch(size){
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case 1:
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this.constantPoolCount = new DataView(data,this.i,1).getUint8(0);
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this.i += 1;
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break;
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case 2:
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this.constantPoolCount = new DataView(data,this.i,2).getUint16(0);
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this.i += 2;
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break;
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case 4:
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this.constantPoolCount = new DataView(data,this.i,4).getUint32(0);
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this.i += 4;
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break;
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case 8:
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this.constantPoolCount = new DataView(data,this.i,8).getUint64(0);
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this.i += 8;
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break;
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}
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};
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this.get = function(size){
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switch(size){
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case 1:
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this.constantPoolCount = new DataView(data,this.i,1).getInt8(0);
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this.i += 1;
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break;
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case 2:
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this.constantPoolCount = new DataView(data,this.i,2).getInt16(0);
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this.i += 2;
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break;
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case 4:
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this.constantPoolCount = new DataView(data,this.i,4).getInt32(0);
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this.getF = function(size){
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var result;
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switch(size){
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case 4:
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result = new DataView(data,this.i,4).getFloat32(0);
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this.i += 4;
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break;
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case 8:
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this.constantPoolCount = new DataView(data,this.i,8).getInt64(0);
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result = new DataView(data,this.i,8).getFloat64(0);
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this.i += 8;
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break;
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default:
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throw "Weird size float " + size;
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}
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return result;
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}
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this.getU = function(size){
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var result;
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switch(size){
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case 1:
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result = new DataView(data,this.i,1).getUint8(0);
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this.i += 1;
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break;
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case 2:
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result = new DataView(data,this.i,2).getUint16(0);
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this.i += 2;
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break;
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case 4:
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result = new DataView(data,this.i,4).getUint32(0);
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this.i += 4;
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break;
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case 8:
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result = new DataView(data,this.i,8).getUint64(0);
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this.i += 8;
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break;
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default:
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throw "Weird size " + size;
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}
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return result;
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}
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this.get = function(size){
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var result;
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switch(size){
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case 1:
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result = new DataView(data,this.i,1).getInt8(0);
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this.i += 1;
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break;
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case 2:
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result = new DataView(data,this.i,2).getInt16(0);
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this.i += 2;
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break;
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case 4:
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result = new DataView(data,this.i,4).getInt32(0);
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this.i += 4;
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break;
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case 8:
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result = new DataView(data,this.i,8).getInt64(0);
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this.i += 8;
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break;
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default:
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throw "Weird size " + size;
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}
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return result;
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}
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this.getUint8 = function () { return this.getU(1) }
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this.getU1 = this.getUint8;
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this.getUint16 = function () { return this.getU(2) }
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@ -55,4 +81,7 @@ DataStream = function(data){
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this.getInt16 = function () { return this.get(2) }
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this.getInt32 = function () { return this.get(4) }
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this.getInt64 = function () { return this.get(8) }
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this.getFloat32 = function () { return this.getF(4) }
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this.getFloat64 = function () { return this.getF(8) }
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return this;
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}
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15
main.js
15
main.js
@ -1,6 +1,8 @@
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include("linearDataStream.js");
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include("constantPool.js");
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function slurpFile (filename, fa) {
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var xmlHttpRequest, response, result ;
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// ie support if (typeof ActiveXObject == "function") return this.load_binary_ie9(filename, fa);
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@ -36,6 +38,7 @@ function slurpFile (filename, fa) {
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return result;
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};
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log = function (msg){
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write(msg);
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if (console){
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console.log(msg);
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}
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@ -87,17 +90,19 @@ ConstantPoolStruct = function (tag,info){
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ClassDefinition = function (file){
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var dataStream = new DataStream(slurpFile(file)[1]);
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this.magic = dataStream.getU4();
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this.magic == 0xCAFEBABE || alert("Invalid Class Magic");
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if (this.magic != 0xCAFEBABE){
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throw "Invalid Class Magic (" + this.magic + ")" ;
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}
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this.minorVersion = dataStream.getU2();
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this.majorVersion = dataStream.getU2();
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this.constantPoolCount = dataStream.getU2();
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this.constantPool = [];
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for(var i = 1; i <= this.constantPoolCount; i++){
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for(var i = 1; i <= this.constantPoolCount; i++){
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var tag = dataStream.getU1();
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var alloc = allocConstEntry(tag);
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// new ConstantPoolStruct(tag,0);
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var alloc = allocConstEntry(tag);
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alloc.read(dataStream);
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var info = new DataView(x, 10 + (i-1) * (1 + 1) + 1,1).getUint8(0);
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this.constantPool[(i-1)] = new ConstantPoolStruct(tag,info);
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this.constantPool[(i-1)] = alloc;
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}
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}
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