爱特每羊队
318 lines
14 KiB
Rust
318 lines
14 KiB
Rust
use crate::opcode::{self, OpCode};
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use oxide_parser::{AssignmentOperator, Expression, Statement, UnaryOperator};
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use crate::compiler::{is_int_literal, BinaryOperator, CompileCtx, Compiler};
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use crate::module::Constant;
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impl Compiler {
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pub(crate) fn emit_statement(
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&self,
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stmt: &Statement,
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ctx: &mut CompileCtx,
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) -> Result<Option<u8>, String> {
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match stmt {
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Statement::ExpressionStatement(es) => {
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Ok(Some(self.emit_expression(&es.expression, ctx)?))
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}
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Statement::VariableDeclaration(decl) => {
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let mut r = None;
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for d in &decl.declarations {
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let name = match &d.id {
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oxide_parser::BindingPattern::BindingIdentifier(bi) => bi.name.as_str(),
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_ => return Err("destructuring not supported".into()),
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};
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let var_reg = ctx.alloc_reg();
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ctx.declare(name, var_reg)?;
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if let Some(init) = &d.init {
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let val_reg = self.emit_expression(init, ctx)?;
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ctx.emit(opcode::encode(OpCode::STORE_VAR, var_reg, val_reg, 0));
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ctx.init_var(name);
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r = Some(val_reg);
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} else {
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let idx = ctx.add_constant(Constant::Undefined);
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let tmp = ctx.alloc_reg();
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ctx.emit(opcode::encode(
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OpCode::LOAD_CONST,
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tmp,
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(idx & 0xFF) as u8,
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((idx >> 8) & 0xFF) as u8,
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));
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ctx.emit(opcode::encode(OpCode::STORE_VAR, var_reg, tmp, 0));
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ctx.init_var(name);
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r = Some(var_reg);
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}
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}
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Ok(r)
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}
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Statement::ReturnStatement(ret) => {
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match &ret.argument {
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Some(expr) => {
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let r = self.emit_expression(expr, ctx)?;
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ctx.emit(opcode::encode(OpCode::RETURN, r, 0, 0));
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}
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None => {
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ctx.emit(opcode::encode(OpCode::RETURN, 0, 0, 0));
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}
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}
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Ok(None)
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}
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Statement::BlockStatement(block) => {
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ctx.push_scope();
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let mut r = None;
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for s in &block.body {
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if let Some(rr) = self.emit_statement(s, ctx)? {
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r = Some(rr);
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}
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}
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ctx.pop_scope();
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Ok(r)
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}
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_ => Ok(None),
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}
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}
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pub(crate) fn emit_expression(
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&self,
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expr: &Expression,
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ctx: &mut CompileCtx,
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) -> Result<u8, String> {
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match expr {
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Expression::NumericLiteral(n) => {
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let idx = if is_int_literal(n.value) {
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ctx.add_constant(Constant::Int(n.value as i32))
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} else {
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ctx.add_constant(Constant::Number(n.value))
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};
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let r = ctx.alloc_reg();
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ctx.emit(opcode::encode(
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OpCode::LOAD_CONST,
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r,
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(idx & 0xFF) as u8,
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((idx >> 8) & 0xFF) as u8,
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));
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Ok(r)
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}
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Expression::StringLiteral(s) => {
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let idx = ctx.add_constant(Constant::String(s.value.to_string()));
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let r = ctx.alloc_reg();
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ctx.emit(opcode::encode(
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OpCode::LOAD_CONST,
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r,
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(idx & 0xFF) as u8,
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((idx >> 8) & 0xFF) as u8,
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));
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Ok(r)
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}
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Expression::BooleanLiteral(b) => {
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let idx = ctx.add_constant(Constant::Boolean(b.value));
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let r = ctx.alloc_reg();
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ctx.emit(opcode::encode(
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OpCode::LOAD_CONST,
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r,
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(idx & 0xFF) as u8,
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((idx >> 8) & 0xFF) as u8,
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));
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Ok(r)
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}
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Expression::NullLiteral(_) => {
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let idx = ctx.add_constant(Constant::Null);
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let r = ctx.alloc_reg();
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ctx.emit(opcode::encode(
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OpCode::LOAD_CONST,
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r,
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(idx & 0xFF) as u8,
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((idx >> 8) & 0xFF) as u8,
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));
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Ok(r)
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}
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Expression::BinaryExpression(bin) => {
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let left = self.emit_expression(&bin.left, ctx)?;
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let right = self.emit_expression(&bin.right, ctx)?;
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let op = match bin.operator {
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BinaryOperator::Addition => OpCode::ADD,
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BinaryOperator::Subtraction => OpCode::SUB,
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BinaryOperator::Multiplication => OpCode::MUL,
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BinaryOperator::Division => OpCode::DIV,
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BinaryOperator::Remainder => OpCode::MOD,
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BinaryOperator::Equality => OpCode::EQ,
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BinaryOperator::Inequality => OpCode::NEQ,
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BinaryOperator::LessThan => OpCode::LT,
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BinaryOperator::GreaterThan => OpCode::GT,
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BinaryOperator::LessEqualThan => OpCode::LTE,
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BinaryOperator::GreaterEqualThan => OpCode::GTE,
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BinaryOperator::In => OpCode::IN,
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_ => return Err(format!("unsupported binary operator: {:?}", bin.operator)),
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};
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let r = ctx.alloc_reg();
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ctx.emit(opcode::encode(op, r, left, right));
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Ok(r)
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}
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Expression::UnaryExpression(un) => {
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let arg = self.emit_expression(&un.argument, ctx)?;
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match un.operator {
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UnaryOperator::UnaryNegation => {
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let r = ctx.alloc_reg();
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ctx.emit(opcode::encode(OpCode::NEG, r, arg, 0));
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Ok(r)
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}
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UnaryOperator::Typeof => {
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let r = ctx.alloc_reg();
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ctx.emit(opcode::encode(OpCode::TYPEOF, r, arg, 0));
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Ok(r)
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}
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UnaryOperator::Void => {
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let r = ctx.alloc_reg();
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ctx.emit(opcode::encode(OpCode::VOID, r, arg, 0));
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Ok(r)
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}
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_ => Err(format!("unsupported unary operator: {:?}", un.operator)),
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}
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}
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Expression::StaticMemberExpression(member) => {
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let obj_reg = self.emit_expression(&member.object, ctx)?;
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let prop_name = member.property.name.as_str();
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let idx = ctx.add_constant(Constant::String(prop_name.to_string()));
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let key_reg = ctx.alloc_reg();
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ctx.emit(opcode::encode(
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OpCode::LOAD_CONST,
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key_reg,
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(idx & 0xFF) as u8,
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((idx >> 8) & 0xFF) as u8,
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));
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let result_reg = ctx.alloc_reg();
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ctx.emit(opcode::encode(
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OpCode::IC_GET_PROP,
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result_reg,
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obj_reg,
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key_reg,
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));
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ctx.emit(0);
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Ok(result_reg)
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}
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Expression::ComputedMemberExpression(member) => {
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let obj_reg = self.emit_expression(&member.object, ctx)?;
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let key_reg = self.emit_expression(&member.expression, ctx)?;
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let r = ctx.alloc_reg();
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ctx.emit(opcode::encode(
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OpCode::GET_PROP_DYNAMIC,
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obj_reg,
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key_reg,
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r,
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));
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Ok(r)
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}
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Expression::ObjectExpression(obj) => {
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let obj_reg = ctx.alloc_reg();
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ctx.emit(opcode::encode(OpCode::NEW_OBJECT, obj_reg, 0, 0));
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for prop in &obj.properties {
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let oxide_parser::ObjectPropertyKind::ObjectProperty(p) = prop else {
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return Err("spread properties not yet supported".into());
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};
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let prop_name = match &p.key {
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oxide_parser::PropertyKey::StaticIdentifier(ident) => {
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ident.name.as_str().to_string()
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}
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oxide_parser::PropertyKey::StringLiteral(s) => s.value.to_string(),
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_ => return Err("unsupported object property key type".into()),
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};
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let idx = ctx.add_constant(Constant::String(prop_name.to_string()));
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let key_reg = ctx.alloc_reg();
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ctx.emit(opcode::encode(
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OpCode::LOAD_CONST,
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key_reg,
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(idx & 0xFF) as u8,
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((idx >> 8) & 0xFF) as u8,
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));
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let val_reg = self.emit_expression(&p.value, ctx)?;
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ctx.emit(opcode::encode(OpCode::SET_PROP, obj_reg, val_reg, key_reg));
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}
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Ok(obj_reg)
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}
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Expression::ArrayExpression(arr) => {
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let arr_reg = ctx.alloc_reg();
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let n = arr.elements.len() as u16;
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ctx.emit(opcode::encode(
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OpCode::NEW_ARRAY,
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arr_reg,
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(n & 0xFF) as u8,
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((n >> 8) & 0xFF) as u8,
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));
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for (i, elem) in arr.elements.iter().enumerate() {
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let Some(e) = elem.as_expression() else {
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return Err("spread not supported".into());
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};
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let val_reg = self.emit_expression(e, ctx)?;
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let idx_reg = ctx.alloc_reg();
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let idx = ctx.add_constant(Constant::Number(i as f64));
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ctx.emit(opcode::encode(
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OpCode::LOAD_CONST,
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idx_reg,
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(idx & 0xFF) as u8,
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((idx >> 8) & 0xFF) as u8,
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));
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ctx.emit(opcode::encode(OpCode::SET_ELEM, arr_reg, idx_reg, val_reg));
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}
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Ok(arr_reg)
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}
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Expression::AssignmentExpression(assign) => {
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if let oxide_parser::AssignmentTarget::StaticMemberExpression(member) = &assign.left
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{
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let obj_reg = self.emit_expression(&member.object, ctx)?;
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let val_reg = self.emit_expression(&assign.right, ctx)?;
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let prop_name = member.property.name.as_str();
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let idx = ctx.add_constant(Constant::String(prop_name.to_string()));
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let key_reg = ctx.alloc_reg();
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ctx.emit(opcode::encode(
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OpCode::LOAD_CONST,
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key_reg,
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(idx & 0xFF) as u8,
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((idx >> 8) & 0xFF) as u8,
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));
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ctx.emit(opcode::encode(
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OpCode::IC_SET_PROP,
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obj_reg,
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val_reg,
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key_reg,
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));
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ctx.emit(0);
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Ok(val_reg)
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} else if let oxide_parser::AssignmentTarget::ComputedMemberExpression(member) =
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&assign.left
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{
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let obj_reg = self.emit_expression(&member.object, ctx)?;
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let key_reg = self.emit_expression(&member.expression, ctx)?;
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let val_reg = self.emit_expression(&assign.right, ctx)?;
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ctx.emit(opcode::encode(
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OpCode::SET_PROP_DYNAMIC,
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obj_reg,
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key_reg,
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val_reg,
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));
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Ok(val_reg)
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} else if let oxide_parser::AssignmentTarget::AssignmentTargetIdentifier(id_ref) =
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&assign.left
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{
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if assign.operator != AssignmentOperator::Assign {
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return Err("compound assignment not yet supported".into());
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}
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let val_reg = self.emit_expression(&assign.right, ctx)?;
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let name = id_ref.name.as_str();
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let var_reg = ctx.lookup_or_global(name);
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ctx.emit(opcode::encode(OpCode::STORE_VAR, var_reg, val_reg, 0));
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Ok(val_reg)
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} else {
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Err("assignment target not supported".into())
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}
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}
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Expression::Identifier(ident) => {
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let var_reg = ctx.lookup(ident.name.as_str())?;
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let r = ctx.alloc_reg();
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ctx.emit(opcode::encode(OpCode::LOAD_VAR, r, var_reg, 0));
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Ok(r)
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}
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Expression::ParenthesizedExpression(p) => self.emit_expression(&p.expression, ctx),
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_ => Err(format!("unsupported expression type: {:?}", expr)),
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}
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}
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}
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