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Start of a breakpoints system

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This commit is contained in:
Mitchell Plamann
2015-04-19 19:48:45 -04:00
parent 6138821c3a
commit 349fd6ff78
2 changed files with 36 additions and 14 deletions
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1
src/bytecode-parser.js
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@@ -85,6 +85,7 @@ var Bc0File = function (filename) {
this.function_pool = [];
for (var i = 0; i < this.function_count; i++) {
this.function_pool.push(new FunctionInfo(stream));
this.function_pool[i].function_id = i;
}
this.native_count = stream.get_u2();

49
src/c0vm.js
View File

@@ -42,6 +42,7 @@ var StackFrame = function(file, f) {
this.stack = [];
this.pc = 0;
this.program = f.code;
this.function_id = f.function_id;
this.variables = [];
for (var i = 0; i < f.num_vars; i++)
this.variables.push(0);
@@ -69,6 +70,8 @@ var ProgramState = function(parsed_file, callback_dict) {
}
}
this.breakpoints = [];
// Memory is just a big array of bytes, right?
// "Allocation" is appending onto this array
// A pointer to memory is an index into this array.
@@ -470,8 +473,11 @@ ProgramState.prototype.step = function() {
}
}
// Takes in a parsed .bc0 file and runs it
function execute(file, callbacks, v) {
ProgramState.prototype.set_breakpoint = function(function_index, opcode_index) {
this.breakpoints.push([function_index, opcode_index]);
}
function initialize_vm(file, callbacks, v) {
verbose = typeof v !== 'undefined' ? v : true;
log("Initializing with file " + file);
@@ -481,25 +487,40 @@ function execute(file, callbacks, v) {
log("Beginning execution");
return state;
}
function run_vm(vm) {
while (true) {
var val = state.step();
for (breakpoint in vm.breakpoints) {
if (vm.frame.function_id == breakpoint[0] &&
vm.frame.pc == breakpoint[1]) {
console.log("Breakpoint reached!");
return vm;
}
}
var val = vm.step();
if (val !== undefined) return val;
if (verbose) {
console.log("Machine state:");
console.log("Machine vm:");
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);
console.log(" Stack: " + vm.frame.stack);
console.log(" PC: " + vm.frame.pc);
console.log(" Vars: " + vm.frame.variables);
// console.log(" Code: " + vm.frame.program);
console.log(" Heap: " + vm.heap);
}
// if (at_breakpoint) {
// save state (maybe in a global in this file?)
// return;
// }
}
}
// Takes in a parsed .bc0 file and runs it
function execute(file, callbacks, v) {
var state = initialize_vm(file, callbacks, v);
return run_vm(state);
}
exports.execute = execute;
exports.initialize_vm = initialize_vm;
exports.run_vm = run_vm;