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refactor annotation lowering code

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This commit is contained in:
Theis Pieter Hollebeek 2024-12-11 14:02:26 +01:00
parent 483a5081e3
commit 5216c3bef0
1 changed files with 25 additions and 18 deletions
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43
compiler/lowerer.ts
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@ -116,6 +116,30 @@ export class Lowerer {
this.program.add(Ops.Jump, this.breakStack.at(-1)!);
}
private lowerBuiltinAnno(annoArgs: Expr[]) {
if (annoArgs.length !== 1) {
throw new Error("invalid # of arguments to builtin annotation");
}
const anno = annoArgs[0];
if (anno.kind.type !== "ident") {
throw new Error(
`unexpected argument type '${anno.kind.type}' expected 'ident'`,
);
}
const value = anno.kind.value;
switch (value) {
case "print": {
this.program.add(Ops.Builtin, Builtins.Print);
break;
}
default: {
throw new Error(
`unrecognized builtin '${value}'`,
);
}
}
}
private lowerFnStmt(stmt: Stmt) {
if (stmt.kind.type !== "fn") {
throw new Error();
@ -135,24 +159,7 @@ export class Lowerer {
this.locals.allocSym(ident);
}
if (stmt.kind.anno?.ident === "builtin") {
const anno = stmt.kind.anno.values[0];
if (!anno) {
throw new Error("builtin annotation without ident");
}
if (anno.kind.type !== "ident") {
throw new Error("builtin annotation without ident");
}
const value = anno.kind.value;
switch (value) {
case "print": {
this.program.add(Ops.LoadLocal, 0);
this.program.add(Ops.Builtin, Builtins.Print);
break;
}
default: {
throw new Error("unrecognized builtin");
}
}
this.lowerBuiltinAnno(stmt.kind.anno.values);
} else {
this.lowerExpr(stmt.kind.body);
}