diff -r a04efdd5e7a3 -r b655ce68983f solutions/cw4a/compiler.sc --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/solutions/cw4a/compiler.sc Fri Jun 02 15:58:57 2023 +0100 @@ -0,0 +1,288 @@ +// Compiler for JVM +// +// call with +// +// amm2 compiler.sc +// + +import $file.lexer +import lexer._ + +import $file.parser +import parser._ + + +val beginning = """ +.class public XXX.XXX +.super java/lang/Object + +.method public static write(I)V + .limit locals 1 + .limit stack 2 + getstatic java/lang/System/out Ljava/io/PrintStream; + iload 0 + invokevirtual java/io/PrintStream/print(I)V + return +.end method + +.method public static writes(Ljava/lang/String;)V + .limit stack 2 + .limit locals 1 + getstatic java/lang/System/out Ljava/io/PrintStream; + aload 0 + invokevirtual java/io/PrintStream/print(Ljava/lang/String;)V + return +.end method + +.method public static read()I + .limit locals 10 + .limit stack 10 + + ldc 0 + istore 1 ; this will hold our final integer +Label1: + getstatic java/lang/System/in Ljava/io/InputStream; + invokevirtual java/io/InputStream/read()I + istore 2 + iload 2 + ldc 10 ; the newline delimiter + isub + ifeq Label2 + iload 2 + ldc 32 ; the space delimiter + isub + ifeq Label2 + + iload 2 + ldc 48 ; we have our digit in ASCII, have to subtract it from 48 + isub + ldc 10 + iload 1 + imul + iadd + istore 1 + goto Label1 +Label2: + ;when we come here we have our integer computed in local variable 1 + iload 1 + ireturn +.end method + +.method public static main([Ljava/lang/String;)V + .limit locals 200 + .limit stack 200 + +; COMPILED CODE STARTS + +""" + +val ending = """ +; COMPILED CODE ENDS + return + +.end method +""" + +// Compiler + +var counter = -1 + +def Fresh(x: String) = { + counter += 1 + x ++ "_" ++ counter.toString() +} + +implicit def string_interpolations(sc: StringContext) = new { + def i(args: Any*): String = " " ++ sc.s(args:_*) ++ "\n" + def l(args: Any*): String = sc.s(args:_*) ++ ":\n" +} + +type Env = Map[String, Int] + +def compile_op(op: String) = op match { + case "+" => i"iadd" + case "-" => i"isub" + case "*" => i"imul" + case "/" => i"idiv" + case "%" => i"irem" +} + +def compile_aexp(a: AExp, env : Env) : String = a match { + case Num(i) => i"ldc $i" + case Var(s) => i"iload ${env(s)} \t\t; $s" + case Aop(op, a1, a2) => + compile_aexp(a1, env) ++ compile_aexp(a2, env) ++ compile_op(op) +} + +def compile_bop(op: String) = op match { + case "==" => "if_icmpne" + case "!=" => "if_icmpeq" + case "<" => "if_icmpge" + case ">" => "if_icmple" +} + +def compile_bexp(b: BExp, env : Env, jmp: String) : String = b match { + case True => "" + case False => i"goto $jmp" + case And(b1, b2) => compile_bexp(b1, env, jmp) ++ compile_bexp(b2, env, jmp) + case Or(b1, b2) => { + val b1_false = Fresh("Or_second"); + val or_end = Fresh("Or_end"); + compile_bexp(b1, env, b1_false) ++ + i"goto $or_end" ++ + l"$b1_false" ++ + compile_bexp(b2, env, jmp) ++ + l"$or_end" + } + case Bop(op, a1, a2) => + compile_aexp(a1, env) ++ compile_aexp(a2, env) ++ i"${compile_bop(op)} $jmp" +} + +def compile_stmt(s: Stmt, env: Env, jmp: String) : (String, Env) = s match { + case Skip => ("", env) + case Break => (i"goto $jmp", env) + case Assign(x, a) => { + val index = env.getOrElse(x, env.keys.size) + (compile_aexp(a, env) ++ i"istore $index \t\t; $x", env + (x -> index)) + } + case If(b, bl1, bl2) => { + val if_else = Fresh("If_else") + val if_end = Fresh("If_end") + val (instrs1, env1) = compile_block(bl1, env, jmp) + val (instrs2, env2) = compile_block(bl2, env1, jmp) + (compile_bexp(b, env, if_else) ++ + instrs1 ++ + i"goto $if_end" ++ + l"$if_else" ++ + instrs2 ++ + l"$if_end", env2) + } + case While(b, bl) => { + val loop_begin = Fresh("Loop_begin") + val loop_end = Fresh("Loop_end") + val (instrs1, env1) = compile_block(bl, env, loop_end) + (l"$loop_begin" ++ + compile_bexp(b, env, loop_end) ++ + instrs1 ++ + i"goto $loop_begin" ++ + l"$loop_end", env1) + } + case For(id, lower, upper, code) => { + val (assignment_code, env1) = compile_stmt(Assign(id, lower), env, jmp) // id := lower; + val while_equivalent = While( + Or(Bop("<", Var(id), upper), Bop("==", Var(id), upper)), // while id <= upper do { + code ++ // code + List( + Assign(id, Aop("+", Var(id), Num(1))) // id := id + 1 + )) // }; + + val (while_code, env2) = compile_stmt(while_equivalent, env1, jmp) + (assignment_code ++ while_code, env2) + } + case WriteId(x) => (i"iload ${env(x)} \t\t; $x" ++ + i"invokestatic XXX/XXX/write(I)V", env) + case WriteString(x) => (s" ldc ${x}\n" ++ + i"invokestatic XXX/XXX/writes(Ljava/lang/String;)V", env) + case Read(x) => { + val index = env.getOrElse(x, env.keys.size) + (i"invokestatic XXX/XXX/read()I" ++ + i"istore $index \t\t; $x", env + (x -> index)) + } +} + +def compile_block(bl: Block, env: Env, jmp: String) : (String, Env) = bl match { + case Nil => ("", env) + case s::bl => { + val (instrs1, env1) = compile_stmt(s, env, jmp) + val (instrs2, env2) = compile_block(bl, env1, jmp) + (instrs1 ++ instrs2, env2) + } +} + +def compile(bl: Block, class_name: String) : String = { + val instructions = compile_block(bl, Map.empty, "")._1 + (beginning ++ instructions ++ ending).replaceAllLiterally("XXX", class_name) +} + +// Compiling and running + +import scala.util._ +import scala.sys.process._ +import scala.io + +def compile_tofile(bl: Block, class_name: String) = { + val output = compile(bl, class_name) + val fw = new java.io.FileWriter(class_name + ".j") + fw.write(output) + fw.close() +} + +def compile_all(bl: Block, class_name: String) : Unit = { + compile_tofile(bl, class_name) + println("compiled ") + val test = ("java -jar jasmin.jar " + class_name + ".j").!! + println("assembled ") +} + +def time_needed[T](i: Int, code: => T) = { + val start = System.nanoTime() + for (j <- 1 to i) code + val end = System.nanoTime() + (end - start)/(i * 1.0e9) +} + +def compile_run(bl: Block, class_name: String) : Unit = { + println("Start compilation") + compile_all(bl, class_name) + println("running") + println("Time: " + time_needed(1, ("java " + class_name + "/" + class_name).!)) +} + +// ---- Q1 + +// Fibonacci + +val fibonacciProgram = """write "Fib"; +read n; +minus1 := 0; +minus2 := 1; +while n > 0 do { + temp := minus2; + minus2 := minus1 + minus2; + minus1 := temp; + n := n - 1 +}; +write "Result"; +write minus2""" + +compile_all(Stmts.parse_all(tokenise(fibonacciProgram)).head, "fib") + +val factorialProgram = """write "Factorial"; +read n; +fact := 1; + +while n > 0 do { + fact := n * fact; + n := n - 1 +}; + +write "Result"; +write fact +""" + +compile_all(Stmts.parse_all(tokenise(factorialProgram)).head, "factorial") + +// ---- Q3 + +/* compile_run(Stmts.parse_all(tokenise("""for i := 1 upto 10 do { + for i := 1 upto 10 do { + write i + } +}""")).head, "nestedloop") */ + + +compile_run(Stmts.parse_all(tokenise(os.read(os.pwd / "collatz2.while"))).head, "collatz2") + + + +compile_run(Stmts.parse_all(tokenise(os.read(os.pwd / "collatz3.while"))).head, "collatz3")