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Merge branch 'mplamann' into run_vm

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Conflicts:
	public/vm/index.js
This commit is contained in:
Aaron Gutierrez
2015-04-13 23:15:38 -04:00
parent d2841cd48f 65197535bc
commit 55b06a1288
52 changed files with 1262 additions and 32 deletions
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58
public/vm/c0vm.js
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@@ -16,6 +16,13 @@ function c0_memory_error(val) {
throw ("c0 memory error: " + val);
}
function num_to_i32(num) {
log("num is 0x" + num.toString(16));
log("num & 0x7FFFFFFF is " + (num & 0x7FFFFFFF));
log("neg factor is " + ( (num & 0x80000000)));
return (num & 0x7FFFFFFF) + ((num & 0x80000000));
}
function i32_to_array(i32) {
return [(i32 & 0xFF),
((i32 >> 8) & 0xFF),
@@ -78,6 +85,8 @@ ProgramState.prototype.push = function(val) {
}
ProgramState.prototype.pop = function() {
if (this.frame.stack === [])
throw "Tried to pop from an empty stack!";
return this.frame.stack.pop();
}
@@ -152,19 +161,20 @@ ProgramState.prototype.step = function() {
var y = this.pop();
var x = this.pop();
log("Adding " + x + " and " + y);
this.push((x+y) % 0x100000000);
this.push(num_to_i32(x+y));
break;
case op.ISUB:
this.frame.pc++;
var y = this.pop();
var x = this.pop();
this.push((x-y) % 0x100000000);
log("Subtracting " + x + " and " + y);
this.push(num_to_i32(x-y));
break;
case op.IMUL:
this.frame.pc++;
var y = this.pop();
var x = this.pop();
this.push((x*y) % 0x100000000);
this.push(num_to_i32(x*y));
break;
case op.IDIV:
this.frame.pc++;
@@ -229,7 +239,9 @@ ProgramState.prototype.step = function() {
case op.VSTORE:
this.frame.pc += 2;
var index = this.frame.program[this.frame.pc-1];
this.frame.variables[index] = this.pop();
var val = this.pop();
this.frame.variables[index] = val;
log("Set variable " + index + " to value " + val);
break;
case op.ACONST_NULL:
this.frame.pc++;
@@ -249,7 +261,7 @@ ProgramState.prototype.step = function() {
var c2 = this.frame.program[this.frame.pc-1];
var index = (c1 * 0x1000) + c2;
this.push(this.file.string_pool[index]);
this.push(this.file.string_from_index(index));
break;
// Control flow
@@ -328,6 +340,8 @@ ProgramState.prototype.step = function() {
};
console.log("Unknown native function index " + f.function_table_index);
}
log("Calling native function with index " + index + " with arguments " +
arg_array);
this.push(native_function(arg_array));
break;
@@ -372,7 +386,7 @@ ProgramState.prototype.step = function() {
// Read offset into a struct
var offset = this.frame.program[this.frame.pc + 1];
var index = this.pop();
this.push(this.heap[index + offset]);
this.push(index + offset);
this.frame.pc += 2;
break;
@@ -380,10 +394,16 @@ ProgramState.prototype.step = function() {
// Read offset into an array
var elt_index = this.pop();
var index = this.pop();
var array_length = this.heap[index];
var elt_size = this.heap[index+1];
if (elt_index >= array_length) c0_memory_error("Array index out of bounds.");
this.push(this.heap[index + 2 + elt_size*elt_index]);
if (typeof index == "string") {
this.push(index.slice(elt_index));
} else {
var array_length = this.heap[index];
var elt_size = this.heap[index+1];
if (elt_index >= array_length)
c0_memory_error("Array index out of bounds.");
this.push(index + 2 + (elt_size*elt_index));
}
this.frame.pc++;
break;
@@ -407,6 +427,7 @@ ProgramState.prototype.step = function() {
for (var i = 0; i < 4; i++)
this.heap[addr + i] = array[i];
this.frame.pc++;
break;
case op.AMLOAD:
var addr = this.pop();
@@ -423,7 +444,10 @@ ProgramState.prototype.step = function() {
case op.CMLOAD:
var addr = this.pop();
this.push(this.heap[addr]);
if (typeof addr == "string")
this.push(addr);
else
this.push(this.heap[addr]);
this.frame.pc++;
break;
@@ -454,12 +478,24 @@ function execute(file, callbacks, v) {
var state = new ProgramState(file, callbacks);
if (verbose) log(file);
log("Beginning execution");
while (true) {
var val = state.step();
if (val !== undefined) return val;
if (verbose) {
console.log("Machine state:");
console.log(" Current Stack Frame:");
console.log(" Stack: " + state.frame.stack);
console.log(" PC: " + state.frame.pc);
console.log(" Vars: " + state.frame.variables);
// console.log(" Code: " + state.frame.program);
console.log(" Heap: " + state.heap);
}
// if (at_breakpoint) {
// save state (maybe in a global in this file?)
// return;