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109 lines
3.2 KiB
109 lines
3.2 KiB
import type { AssignStmt, Expr, Stmt } from "../ast"
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import { R8 } from "../sm83/cpu"
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import { Loc, LocType } from "./loc"
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import type { Operand, SSA } from "./ssa"
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type IRState = {
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nextID: number
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ssa_stmts: Array<SSA>
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}
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export const convertIR = (stmts: Array<Stmt>): Array<SSA> => {
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const state: IRState = {
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nextID: 0,
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ssa_stmts: [],
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}
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stmts.forEach(stmt => {
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const ssa_stmts = convertAssignStmt(state, stmt)
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state.ssa_stmts.push(...ssa_stmts)
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})
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return state.ssa_stmts
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}
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export const convertAssignStmt = (state: IRState, stmt: AssignStmt): Array<SSA> => {
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return convertExpr(state, Loc.vari(stmt.args.name), stmt.args.expr)
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}
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export const convertExpr = (state: IRState, dest: Loc, expr: Expr): Array<SSA> => {
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const threeAddress = convertExpr3(state, dest, expr)
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const output: Array<SSA> = []
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threeAddress.forEach(ssa => {
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// skip copies
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if (!("op" in ssa)) {
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output.push(ssa)
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return
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} else if ("source1" in ssa) {
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let source1 = ssa.source1
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if (typeof source1 !== 'number' && source1.type === LocType.VARIABLE) {
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source1 = Loc.temp(`t${state.nextID++}`)
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output.push(
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{ dest: Loc.reg(R8.A), source: ssa.source1 },
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{ dest: source1, source: Loc.reg(R8.A) },
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)
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}
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output.push(
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{ dest: Loc.reg(R8.A), source: ssa.source },
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{ dest: Loc.reg(R8.A), source: Loc.reg(R8.A), op: ssa.op, source1 },
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{ dest: ssa.dest, source: Loc.reg(R8.A) },
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)
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} else {
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output.push(
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{ dest: Loc.reg(R8.A), source: ssa.source },
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{ dest: Loc.reg(R8.A), source: Loc.reg(R8.A), op: ssa.op },
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{ dest: ssa.dest, source: Loc.reg(R8.A) },
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)
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}
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})
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return output
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}
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export const convertExpr3 = (state: IRState, dest: Loc, expr: Expr): Array<SSA> => {
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let expr_stmts: Array<SSA> = []
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if (typeof expr === "number") {
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expr_stmts = [{ dest, source: expr }]
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} else if (typeof expr === "string") {
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expr_stmts = [{ dest, source: Loc.vari(expr) }]
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} else if (expr.type === "unary") {
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const [source, stmts] = getSource(state, expr.arg)
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stmts.push({
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dest,
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op: expr.op,
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source,
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})
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expr_stmts = stmts
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} else {
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const [left_source, left_stmts] = getSource(state, expr.left)
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const [right_source, right_stmts] = getSource(state, expr.right)
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const stmts = [...left_stmts, ...right_stmts]
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stmts.push({
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dest,
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op: expr.op,
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source: left_source,
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source1: right_source,
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})
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expr_stmts = stmts
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}
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return expr_stmts
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}
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const getSource = (state: IRState, expr: Expr): [Operand, Array<SSA>] => {
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if (typeof expr === "number") {
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return [expr, []]
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} else if (typeof expr === "string") {
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return [Loc.vari(expr), []]
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}
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const source = Loc.temp(`t${state.nextID++}`)
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const stmts = convertExpr3(state, source, expr)
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return [source, stmts]
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}
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