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116 lines
2.9 KiB
116 lines
2.9 KiB
import { convertIR } from "./ir/convert"
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import { prettyPrintBlock } from "./ir/pretty"
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import { parse } from "./parser"
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import { allocateRegisters } from "./regalloc"
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import { generateBlock } from "./sm83/codegen"
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import { R8 } from "./sm83/cpu"
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import type { Attr, Decl, Stmt, Type, VarDecl } from "./ast"
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type SymbolDefn = {
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attrs: Array<Attr>,
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name: string,
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type: Type
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}
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type SymbolMap = {
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[name: string]: SymbolDefn
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}
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// TODO: Support more than one TU
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export const compile = (fileName: string, source: string): string => {
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// 1. Parse
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const ast = parse(source)
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// 2. Partition declarations and statements
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const decls = ast.filter((x): x is Decl => x.type == "decl")
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const stmts = ast.filter((x): x is Stmt => x.type == "stmt")
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// 3. Create top-level symbol map
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const symbols = processDecls(decls)
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// TODO: Support declaring types other than U8/S8
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const asmDecls = Object.values(symbols).map(symbol => `${symbol.name}:: DB`)
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// TODO: Some form of type-checking
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// 4. Generate IR
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const ir = convertIR(stmts)
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console.log("=== IR === ")
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console.log(prettyPrintBlock(ir))
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// 5. Generate code
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const alloc = allocateRegisters(ir, Object.values(R8))
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const insns = generateBlock(alloc, ir)
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let output = ''
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if (asmDecls.length > 0) {
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output += `SECTION "${fileName} Data", WRAM0\n\n`
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output += asmDecls.join("\n")
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output += "\n\n"
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}
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if (insns.length > 0) {
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output += `SECTION "${fileName} Code", ROM0\n\n`
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output += insns.join("\n")
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}
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console.log("=== ASM ===")
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return output
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}
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export const processDecls = (decls: Array<Decl>): SymbolMap => decls.reduce(processDecl, {})
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export const processDecl = (symbols: SymbolMap, decl: Decl): SymbolMap => {
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const symbol = processVarDecl(symbols, decl)
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// Don't declare extern symbols
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if (hasAttr(symbol, { name: 'extern', args: [] })) {
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return symbols
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}
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return {
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...symbols,
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[symbol.name]: symbol,
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}
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}
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export const processVarDecl = (symbols: SymbolMap, decl: VarDecl): SymbolDefn => {
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if (typeof symbols[decl.name] !== 'undefined') {
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throw new Error(`a variable named \`${decl.name}' is already defined`)
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}
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return {
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attrs: decl.attrs,
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name: decl.name,
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type: decl.args.type,
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}
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}
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export const hasAttr = (symbol: SymbolDefn, attr: Attr) => {
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let has = false
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for (let i = 0; i < symbol.attrs.length; ++i) {
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has = attrEquals(symbol.attrs[i], attr)
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if (has) {
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break
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}
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}
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return has
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}
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const attrEquals = (attr1: Attr, attr2: Attr): boolean => {
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if (attr1.name !== attr2.name || attr1.args.length !== attr2.args.length) {
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return false
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}
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for (let i = 0; i < attr1.args.length; ++i) {
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if (attr1.args[i] !== attr2.args[i]) {
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return false
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}
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}
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return true
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}
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