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ts2bril.ts
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ts2bril.ts
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import * as ts from 'https://esm.sh/[email protected]';
import * as bril from './bril-ts/bril.ts';
import {Builder} from './bril-ts/builder.ts';
const opTokens = new Map<ts.SyntaxKind, [bril.ValueOpCode, bril.Type]>([
[ts.SyntaxKind.PlusToken, ["add", "int"]],
[ts.SyntaxKind.AsteriskToken, ["mul", "int"]],
[ts.SyntaxKind.MinusToken, ["sub", "int"]],
[ts.SyntaxKind.SlashToken, ["div", "int"]],
[ts.SyntaxKind.LessThanToken, ["lt", "bool"]],
[ts.SyntaxKind.LessThanEqualsToken, ["le", "bool"]],
[ts.SyntaxKind.GreaterThanToken, ["gt", "bool"]],
[ts.SyntaxKind.GreaterThanEqualsToken, ["ge", "bool"]],
[ts.SyntaxKind.EqualsEqualsToken, ["eq", "bool"]],
[ts.SyntaxKind.EqualsEqualsEqualsToken, ["eq", "bool"]],
]);
const opTokensFloat = new Map<ts.SyntaxKind, [bril.ValueOpCode, bril.Type]>([
[ts.SyntaxKind.PlusToken, ["fadd", "float"]],
[ts.SyntaxKind.AsteriskToken, ["fmul", "float"]],
[ts.SyntaxKind.MinusToken, ["fsub", "float"]],
[ts.SyntaxKind.SlashToken, ["fdiv", "float"]],
[ts.SyntaxKind.LessThanToken, ["flt", "bool"]],
[ts.SyntaxKind.LessThanEqualsToken, ["fle", "bool"]],
[ts.SyntaxKind.GreaterThanToken, ["fgt", "bool"]],
[ts.SyntaxKind.GreaterThanEqualsToken, ["fge", "bool"]],
[ts.SyntaxKind.EqualsEqualsToken, ["feq", "bool"]],
[ts.SyntaxKind.EqualsEqualsEqualsToken, ["feq", "bool"]],
]);
function isTypeReference(ty: ts.Type): ty is ts.TypeReference {
return 'typeArguments' in ty;
}
function tsTypeToBril(tsType: ts.Type, checker: ts.TypeChecker): bril.Type {
if (tsType.flags & (ts.TypeFlags.Number | ts.TypeFlags.NumberLiteral)) {
return "float";
} else if (tsType.flags &
(ts.TypeFlags.Boolean | ts.TypeFlags.BooleanLiteral)) {
return "bool";
} else if (tsType.flags &
(ts.TypeFlags.BigInt | ts.TypeFlags.BigIntLiteral)) {
return "int";
} else if (isTypeReference(tsType) && tsType.symbol && tsType.symbol.name === "Pointer") {
const params = checker.getTypeArguments(tsType);
return { ptr: tsTypeToBril(params[0], checker) };
} else {
throw "unimplemented type " + checker.typeToString(tsType);
}
}
function brilType(node: ts.Node, checker: ts.TypeChecker): bril.Type {
let tsType = checker.getTypeAtLocation(node);
return tsTypeToBril(tsType, checker);
}
/**
* Compile a complete TypeScript AST to a Bril program.
*/
function emitBril(prog: ts.Node, checker: ts.TypeChecker): bril.Program {
let builder = new Builder();
let mainFn = builder.buildFunction("main", []); // Main has no return type.
function emitExpr(expr: ts.Expression): bril.ValueInstruction {
switch (expr.kind) {
case ts.SyntaxKind.NumericLiteral: {
let lit = expr as ts.NumericLiteral;
let val = parseFloat(lit.text);
return builder.buildFloat(val);
}
case ts.SyntaxKind.BigIntLiteral: {
let lit = expr as ts.BigIntLiteral;
let val = parseInt(lit.text);
return builder.buildInt(val);
}
case ts.SyntaxKind.TrueKeyword: {
return builder.buildBool(true);
}
case ts.SyntaxKind.FalseKeyword: {
return builder.buildBool(false);
}
case ts.SyntaxKind.Identifier: {
let ident = expr as ts.Identifier;
let type = brilType(ident, checker);
return builder.buildValue("id", type, [ident.text]);
}
case ts.SyntaxKind.BinaryExpression:
let bin = expr as ts.BinaryExpression;
let kind = bin.operatorToken.kind;
// Handle assignments.
switch (kind) {
case ts.SyntaxKind.EqualsToken:
if (!ts.isIdentifier(bin.left)) {
throw "assignment to non-variables unsupported";
}
let dest = bin.left as ts.Identifier;
let rhs = emitExpr(bin.right);
let type = brilType(dest, checker);
return builder.buildValue("id", type, [rhs.dest], undefined, undefined, dest.text);
}
// Handle "normal" value operators.
let op: bril.ValueOpCode;
let type: bril.Type;
if (brilType(bin.left, checker) === "float" ||
brilType(bin.right, checker) === "float") {
// Floating point operators.
let p = opTokensFloat.get(kind);
if (!p) {
throw `unhandled FP binary operator kind ${kind}`;
}
[op, type] = p;
} else {
// Non-float.
let p = opTokens.get(kind);
if (!p) {
throw `unhandled binary operator kind ${kind}`;
}
[op, type] = p;
}
let lhs = emitExpr(bin.left);
let rhs = emitExpr(bin.right);
return builder.buildValue(op, type, [lhs.dest, rhs.dest]);
// Support call instructions---but only for printing, for now.
case ts.SyntaxKind.CallExpression:
let call = expr as ts.CallExpression;
let callText = call.expression.getText();
if (callText === "console.log") {
let values = call.arguments.map(emitExpr);
builder.buildEffect("print", values.map(v => v.dest));
return builder.buildInt(0); // Expressions must produce values.
} else if (memoryBuiltins[callText]) {
return memoryBuiltins[callText](call);
} else {
// Recursively translate arguments.
let values = call.arguments.map(emitExpr);
// Check if effect statement, i.e., a call that is not a subexpression
if (call.parent.kind === ts.SyntaxKind.ExpressionStatement) {
builder.buildCall(callText,
values.map(v => v.dest));
return builder.buildInt(0); // Expressions must produce values
} else {
let decl = call.parent as ts.VariableDeclaration;
let type = brilType(decl, checker);
let name = (decl.name != undefined) ? decl.name.getText() : undefined;
return builder.buildCall(
callText,
values.map(v => v.dest),
type,
name,
);
}
}
default:
throw `unsupported expression kind: ${expr.getText()}`;
}
}
function emit(node: ts.Node) {
switch (node.kind) {
// Descend through containers.
case ts.SyntaxKind.SourceFile:
case ts.SyntaxKind.Block:
case ts.SyntaxKind.VariableStatement:
case ts.SyntaxKind.VariableDeclarationList:
ts.forEachChild(node, emit);
break;
// No-op.
case ts.SyntaxKind.EndOfFileToken:
break;
// Emit declarations.
case ts.SyntaxKind.VariableDeclaration: {
let decl = node as ts.VariableDeclaration;
// Declarations without initializers are no-ops.
if (decl.initializer) {
let init = emitExpr(decl.initializer);
let type = brilType(decl, checker);
builder.buildValue("id", type, [init.dest], undefined, undefined, decl.name.getText());
}
break;
}
// Expressions by themselves.
case ts.SyntaxKind.ExpressionStatement: {
let exstmt = node as ts.ExpressionStatement;
emitExpr(exstmt.expression); // Ignore the result.
break;
}
// Conditionals.
case ts.SyntaxKind.IfStatement: {
let if_ = node as ts.IfStatement;
// Label names.
let sfx = builder.freshSuffix();
let thenLab = "then" + sfx;
let elseLab = "else" + sfx;
let endLab = "endif" + sfx;
// Branch.
let cond = emitExpr(if_.expression);
builder.buildEffect("br", [cond.dest], undefined, [thenLab, elseLab]);
// Statement chunks.
builder.buildLabel(thenLab);
emit(if_.thenStatement);
const then_branch_terminated = builder.getLastInstr()?.op === "ret";
if (!then_branch_terminated) {
builder.buildEffect("jmp", [], undefined, [endLab]);
}
builder.buildLabel(elseLab);
if (if_.elseStatement) {
emit(if_.elseStatement);
}
// The else branch otherwise just falls through without needing a target label
if (!then_branch_terminated) {
builder.buildLabel(endLab);
}
break;
}
// Plain "for" loops.
case ts.SyntaxKind.ForStatement: {
let for_ = node as ts.ForStatement;
// Label names.
let sfx = builder.freshSuffix();
let condLab = "for.cond" + sfx;
let bodyLab = "for.body" + sfx;
let endLab = "for.end" + sfx;
// Initialization.
if (for_.initializer) {
emit(for_.initializer);
}
// Condition check.
builder.buildLabel(condLab);
if (for_.condition) {
let cond = emitExpr(for_.condition);
builder.buildEffect("br", [cond.dest], undefined, [bodyLab, endLab]);
}
builder.buildLabel(bodyLab);
emit(for_.statement);
if (for_.incrementor) {
emitExpr(for_.incrementor);
}
builder.buildEffect("jmp", [], undefined, [condLab]);
builder.buildLabel(endLab);
break;
}
case ts.SyntaxKind.FunctionDeclaration:
let funcDef = node as ts.FunctionDeclaration;
if (funcDef.name === undefined) {
throw `no anonymous functions!`;
}
let name: string = funcDef.name.getText();
let args: bril.Argument[] = [];
for (let p of funcDef.parameters) {
let argName = p.name.getText();
let argType = brilType(p, checker);
args.push({name: argName, type: argType} as bril.Argument);
}
// The type checker gives a full function type;
// we want only the return type.
if (funcDef.type && funcDef.type.getText() !== 'void') {
builder.buildFunction(name, args, brilType(funcDef.type, checker));
} else {
builder.buildFunction(name, args);
}
if (funcDef.body) {
emit(funcDef.body);
}
builder.setCurrentFunction(mainFn);
break;
case ts.SyntaxKind.ReturnStatement: {
let retstmt = node as ts.ReturnStatement;
if (retstmt.expression) {
let val = emitExpr(retstmt.expression);
builder.buildEffect("ret", [val.dest]);
} else {
builder.buildEffect("ret", []);
}
break;
}
case ts.SyntaxKind.ImportDeclaration:
break;
default:
throw `unhandled TypeScript AST node kind ${ts.SyntaxKind[node.kind]}`;
}
}
const memoryBuiltins: Record<string, (call: ts.CallExpression) => bril.ValueInstruction> = {
"mem.alloc": (call) => {
let type = brilType(call, checker);
let values = call.arguments.map(emitExpr);
return builder.buildValue("alloc", type, values.map(v => v.dest));
},
"mem.store": (call) => {
let values = call.arguments.map(emitExpr);
builder.buildEffect("store", values.map(v => v.dest));
return builder.buildInt(0); // Expressions must produce values.
},
"mem.load": (call) => {
let type = brilType(call, checker);
let values = call.arguments.map(emitExpr);
return builder.buildValue("load", type, values.map(v => v.dest));
},
"mem.free": (call) => {
let values = call.arguments.map(emitExpr);
builder.buildEffect("free", values.map(v => v.dest));
return builder.buildInt(0);
},
"mem.ptradd": (call) => {
let type = brilType(call, checker);
let values = call.arguments.map(emitExpr);
return builder.buildValue("ptradd", type, values.map(v => v.dest));
}
}
emit(prog);
return builder.program;
}
async function main() {
// Get the TypeScript filename.
let filename = Deno.args[0];
if (!filename) {
console.error(`usage: ts2bril src.ts`)
Deno.exit(1);
}
// Load up the TypeScript context.
let program = ts.createProgram([filename], {
target: ts.ScriptTarget.ES5,
});
let checker = program.getTypeChecker();
// Do a weird dance to look up our source file.
let sf: ts.SourceFile | undefined;
for (let file of program.getSourceFiles()) {
if (file.fileName === filename) {
sf = file;
break;
}
}
if (!sf) {
throw "source file not found";
}
// Generate Bril code.
let brilProg = emitBril(sf, checker);
let json = JSON.stringify(brilProg, undefined, 2);
await Deno.stdout.write(
new TextEncoder().encode(json)
);
}
main();