188 lines
6 KiB
Java
188 lines
6 KiB
Java
// Do not modify the code below except for replacing the "..."! Don't
|
|
// add anything (including "public" declarations), don't remove
|
|
// anything (including "public" declarations). Don't wrap it in a
|
|
// package, don't make it an innner class of some other class. If
|
|
// your IDE suggsts to change anything below, ignore your IDE. You are
|
|
// welcome to add new classes! Please put them into separate files.
|
|
|
|
import java.util.List;
|
|
|
|
class Program { // Used in Tasks 1, 2, 3.
|
|
// Leaves in the accumulator what running the first declaration leaves in the accumulator.
|
|
public List <Declaration> decls;
|
|
public Program ( List <Declaration> _decls ) {
|
|
assert ( _decls.size () > 0 ); // ensures that we have at least one declaration the
|
|
// first element in decls is the the procedure executed
|
|
// at startup. We assume that this initial procedure takes
|
|
// 0 arguments. NOTE: the entry procedure does NOT have
|
|
// have to be called "main". It can have ANY valid identifier
|
|
// as name.
|
|
assert ( _decls.get ( 0 ).numOfArgs == 0 ); // ensures that the first declaration takes
|
|
// 0 arguments.
|
|
decls = _decls; } }
|
|
|
|
|
|
class Declaration { // Used in Tasks 1, 2, 3.
|
|
public String id;
|
|
public int numOfArgs; // Used for computing the size of the AR.
|
|
public Exp body;
|
|
|
|
public Declaration ( String _id, int _numOfargs, Exp _body ) {
|
|
assert ( _numOfargs >= 0 );
|
|
id = _id;
|
|
numOfArgs = _numOfargs;
|
|
body = _body; } }
|
|
|
|
|
|
abstract class Exp {} // Used in Tasks 1, 2, 3.
|
|
|
|
class IntLiteral extends Exp { // Used in Tasks 1, 2, 3.
|
|
// Leaves n in the accumulator.
|
|
public int n;
|
|
IntLiteral ( int _n ) { n = _n; } }
|
|
|
|
class Variable extends Exp { // Used in Tasks 1, 2, 3.
|
|
// Leaves the content of the variables x in the accumulator. Note
|
|
// that the integer x represents the OFFSET of the variable relative
|
|
// to the encompassing procedure declaration (which is used by the
|
|
// code generator to compute, at compile time, the place, relative
|
|
// to the frame pointer, where the variable is stored at
|
|
// run-time). It does NOT hold the values the variable takes at
|
|
// run-time. E.g. in
|
|
//
|
|
// def f ( a, b, c, d ) = ...
|
|
//
|
|
// the variable a has offset 1, b has offset 2, c has 3 and d has
|
|
// 4. There are no other offsets for this procedure.
|
|
public int x;
|
|
public Variable ( int _x ) {
|
|
assert ( _x > 0 ); // ensures that 1 is the smallest possible offset.
|
|
x = _x; } }
|
|
|
|
class If extends Exp { // Used in Tasks 1, 2, 3.
|
|
// If the comparison is true, executes the thenBody.
|
|
// Otherwise the elseBody is executed.
|
|
public Exp l;
|
|
public Comp comp;
|
|
public Exp r;
|
|
public Exp thenBody;
|
|
public Exp elseBody;
|
|
public If ( Exp _l, Comp _comp, Exp _r, Exp _thenBody, Exp _elseBody ) {
|
|
l = _l;
|
|
comp = _comp;
|
|
r = _r;
|
|
thenBody = _thenBody;
|
|
elseBody = _elseBody; } }
|
|
|
|
class Binexp extends Exp { // Used in Tasks 1, 2, 3.
|
|
// Evaluates l, then r, and applies binop to both.
|
|
public Exp l;
|
|
public Binop binop;
|
|
public Exp r;
|
|
public Binexp ( Exp _l, Binop _binop, Exp _r ) {
|
|
l = _l;
|
|
binop = _binop;
|
|
r = _r; } }
|
|
|
|
class Invoke extends Exp { // Used in Tasks 1, 2, 3.
|
|
// Evaluates the arguments right-to-left. Then calls the procedure name with
|
|
// these arguments.
|
|
public String name;
|
|
public List<Exp> args;
|
|
public Invoke ( String _name, List<Exp> _args ) {
|
|
name = _name;
|
|
args = _args; } }
|
|
|
|
class While extends Exp { // Used in Tasks 2, 3.
|
|
// Implements the standard while-loop,
|
|
// Can return anything in accumulator
|
|
public Exp l;
|
|
public Comp comp;
|
|
public Exp r;
|
|
public Exp body;
|
|
public While ( Exp _l, Comp _comp, Exp _r, Exp _body ) {
|
|
l = _l;
|
|
comp = _comp;
|
|
r = _r;
|
|
body = _body; } }
|
|
|
|
class RepeatUntil extends Exp { // Used in Tasks 2, 3.
|
|
// Implements the standard repeat-unitl loop,
|
|
// Can return anything in accumulator.
|
|
public Exp body;
|
|
public Exp l;
|
|
public Comp comp;
|
|
public Exp r;
|
|
public RepeatUntil ( Exp _body, Exp _l, Comp _comp, Exp _r ) {
|
|
body = _body;
|
|
l = _l;
|
|
comp = _comp;
|
|
r = _r; } }
|
|
|
|
class Assign extends Exp { // Used in Tasks 2, 3.
|
|
// Evaluates the right-hand side e, and stores the result
|
|
// Can return anything in accumulator.
|
|
public int x;
|
|
public Exp e;
|
|
public Assign ( int _x, Exp _e ) {
|
|
assert ( _x > 0 );
|
|
x = _x;
|
|
e = _e; } }
|
|
|
|
class Seq extends Exp { // Used in Tasks 2, 3.
|
|
// Runs l first, then r.
|
|
// Returns the result of r in the accumulator.
|
|
public Exp l;
|
|
public Exp r;
|
|
public Seq ( Exp _l, Exp _r ) {
|
|
l = _l;
|
|
r = _r; } }
|
|
|
|
class Skip extends Exp { // Used in Tasks 2, 3.
|
|
// Does nothing.
|
|
// Can return anything in accumulator.
|
|
public Skip () {} }
|
|
|
|
class Break extends Exp { // Used in Task 3 only.
|
|
// Exits the nearest enclosing loop. Leaves
|
|
// Can return anything in accumulator.
|
|
public Break () {} }
|
|
|
|
class Continue extends Exp { // Used in Task 3 only.
|
|
// Abandons the current iteration of the nearest enclosing
|
|
// loop, jumping straight to the checking of the conditional.
|
|
// Can return anything in accumulator.
|
|
public Continue () {} }
|
|
|
|
|
|
abstract class Comp {} // Used in Tasks 1, 2, 3.
|
|
|
|
class Less extends Comp { // Used in Tasks 2, 3.
|
|
public Less () {} }
|
|
|
|
class LessEq extends Comp { // Used in Tasks 2, 3.
|
|
public LessEq () {} }
|
|
|
|
class Equals extends Comp { // Used in Tasks 1, 2, 3.
|
|
public Equals () {} }
|
|
|
|
class Greater extends Comp { // Used in Tasks 2, 3.
|
|
public Greater () {} }
|
|
|
|
class GreaterEq extends Comp { // Used in Tasks 2, 3.
|
|
public GreaterEq () {} }
|
|
|
|
|
|
abstract class Binop {}
|
|
|
|
class Plus extends Binop { // Used in Tasks 1, 2, 3.
|
|
public Plus () {} }
|
|
|
|
class Minus extends Binop { // Used in Tasks 1, 2, 3.
|
|
public Minus () {} }
|
|
|
|
class Times extends Binop { // Used in Tasks 2, 3.
|
|
public Times () {} }
|
|
|
|
class Div extends Binop { // Used in Task 3 only.
|
|
public Div () {} }
|