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[VM] Implemented stack_push(m) and stack_pop(m) opcodes.

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This commit is contained in:
jtuu 2019-10-07 20:52:44 +03:00
parent 345c9ab0dc
commit dbe4f3ab78
1 changed files with 51 additions and 0 deletions
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51
src/quest_editor/scripting/vm/index.ts
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@ -74,6 +74,10 @@ import {
OP_UJMPI_LE,
OP_JMP_LE,
OP_JMPI_LE,
OP_STACK_POP,
OP_STACK_PUSH,
OP_STACK_PUSHM,
OP_STACK_POPM,
} from "../opcodes";
import Logger from "js-logger";
@ -81,6 +85,7 @@ const logger = Logger.get("quest_editor/scripting/vm");
const REGISTER_COUNT = 256;
const REGISTER_SIZE = 4;
const VARIABLE_STACK_LENGTH = 16; // TODO: verify this value
export enum ExecutionResult {
Ok,
@ -476,6 +481,19 @@ export class VirtualMachine {
...conditional_jump_args(comparison_ops.lte),
);
break;
// variable stack operations
case OP_STACK_PUSH.code:
this.push_variable_stack(exec, arg0, 1);
break;
case OP_STACK_POP.code:
this.pop_variable_stack(exec, arg0, 1);
break;
case OP_STACK_PUSHM.code:
this.push_variable_stack(exec, arg0, arg1);
break;
case OP_STACK_POPM.code:
this.pop_variable_stack(exec, arg0, arg1);
break;
default:
throw new Error(`Unsupported instruction: ${inst.opcode.mnemonic}.`);
}
@ -672,6 +690,38 @@ export class VirtualMachine {
return arg;
}
private push_variable_stack(exec: Thread, base_reg: number, num_push: number): void {
const end = base_reg + num_push;
if (end > REGISTER_COUNT) {
throw new Error("Variable stack: Invalid register");
}
if (exec.variable_stack.length + num_push > VARIABLE_STACK_LENGTH) {
throw new Error("Variable stack: Stack overflow");
}
for (let r = base_reg; r < end; r++) {
exec.variable_stack.push(this.get_uint(r));
}
}
private pop_variable_stack(exec: Thread, base_reg: number, num_pop: number): void {
const end = base_reg + num_pop;
if (end > REGISTER_COUNT) {
throw new Error("Variable stack: Invalid register");
}
if (exec.variable_stack.length < num_pop) {
throw new Error("Variable stack: Stack underflow");
}
for (let r = end - 1; r >= base_reg; r--) {
this.set_uint(r, exec.variable_stack.pop()!);
}
}
private get_next_instruction_from_thread(exec: Thread): Instruction {
if (exec.call_stack.length) {
const top = exec.call_stack_top();
@ -710,6 +760,7 @@ class Thread {
*/
public call_stack: ExecutionLocation[] = [];
public arg_stack: Arg[] = [];
public variable_stack: number[] = [];
/**
* Global or floor-local?
*/