- import type { AssignStmt, Expr, Stmt } from "./ast"
-
- type Operand = string | number
-
- type ASSA<Data> = { dest: string, source: Operand } & Data
-
- export type SSACopy = ASSA<{ source: Operand }> // dest = source
-
- export type SSAUnary = ASSA<{ op: string }> // dest = op(source)
-
- export type SSABinary = ASSA<{ op: string, source1: Operand }> // dest = op(source, source1)
-
- export type SSA = SSACopy | SSAUnary | SSABinary
-
- type IRState = {
- nextID: number
- ssa_stmts: Array<SSA>
- }
-
- export const convertIR = (stmts: Array<Stmt>): Array<SSA> => {
- const state: IRState = {
- nextID: 0,
- ssa_stmts: [],
- }
-
- stmts.forEach(stmt => {
- const ssa_stmts = convertAssignStmt(state, stmt)
- state.ssa_stmts.push(...ssa_stmts)
- })
-
- return state.ssa_stmts
- }
-
- export const convertAssignStmt = (state: IRState, stmt: AssignStmt): Array<SSA> => {
- return convertExpr(state, stmt.args.name, stmt.args.expr)
- }
-
- export const convertExpr = (state: IRState, dest: string, expr: Expr): Array<SSA> => {
- let expr_stmts = []
-
- if (typeof expr === "number" || typeof expr === "string") {
- expr_stmts = [{ dest, source: expr }]
- } else if (expr.type === "unary") {
- const [source, stmts] = getSource(state, expr.arg)
- stmts.push({
- dest,
- op: expr.op,
- source,
- })
-
- expr_stmts = stmts
- } else {
- const [left_source, left_stmts] = getSource(state, expr.left)
- const [right_source, right_stmts] = getSource(state, expr.right)
-
- const stmts = [...left_stmts, ...right_stmts]
- stmts.push({
- dest,
- op: expr.op,
- source: left_source,
- source1: right_source,
- })
-
- expr_stmts = stmts
- }
-
- return expr_stmts
- }
-
- const getSource = (state: IRState, expr: Expr): [string | number, Array<SSA>] => {
- if (typeof expr === "number" || typeof expr === "string") {
- return [expr, []]
- }
-
- const source = `temp${state.nextID++}`
- const stmts = convertExpr(state, source, expr)
- return [source, stmts]
- }
-
- export const prettyPrintIR = (ssa: SSA): string => {
- let output = ""
-
- if ("source1" in ssa) {
- output = `${ssa.dest} = ${ssa.op}(${ssa.source}, ${ssa.source1})`
- } else if ("op" in ssa) {
- output = `${ssa.dest} = ${ssa.op}(${ssa.source})`
- } else {
- output = `${ssa.dest} = ${ssa.source}`
- }
-
- return output
- }
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