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MinijavaPrintListener.py
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MinijavaPrintListener.py
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from grammer.MinijavaListener import MinijavaListener
from grammer.MinijavaParser import MinijavaParser
def keyboard(banner=None):
import code, sys
# use exception trick to pick up the current frame
try:
raise None
except:
frame = sys.exc_info()[2].tb_frame.f_back
# evaluate commands in current namespace
namespace = frame.f_globals.copy()
namespace.update(frame.f_locals)
code.interact(banner=banner, local=namespace)
class MiniJavaPrintListener(MinijavaListener):
def __init__(self, symbolTable):
super().__init__()
self.currentClass = ""
self.currentMethod = ""
self.lastExpressionType = ""
self.codeStore = {}
self.code = ""
self.isInitialized = False
self.symbolTable = symbolTable
self.lables = []
self.lableCounter = 0
self.block_number = 0
self.variables = {}
def get_bytecode(self):
return self.codeStore
@staticmethod
def get_representation(s_type):
if s_type == 'int':
return 'I'
elif s_type == 'boolean':
return 'Z'
else:
print("type UNKNOWN", s_type)
def get_new_lable(self):
lable = 'LABLE_' + str(self.lableCounter)
self.lableCounter = self.lableCounter + 1
self.lables.append(lable)
return lable
def get_last_lable(self):
return self.lables[-1]
def remove_last_lable(self):
self.lables = self.lables[:-1]
@staticmethod
def get_return_by_type(s_type):
#todo implement array
if s_type == 'int':
return 'ireturn'
elif s_type == 'boolean':
return 'ireturn'
def get_method_type(self, method_name):
prop = self.symbolTable[self.currentClass][method_name]
return_type = prop['return_type']
return return_type
def get_method_inp_type(self, method_name, lookup_class=None):
if lookup_class is None:
lookup_class = self.currentClass
print(lookup_class, "PPPPPPPPP")
print(self.symbolTable[lookup_class])
prop = self.symbolTable[lookup_class][method_name]
inputs = prop["inputs"]
str_types = ""
for inp in inputs:
str_types += self.get_representation(inp[0]) + ','
return str_types[:-1]
def enterMainClass(self, ctx:MinijavaParser.MainClassContext):
self.currentClass = ctx.getChild(1).getText()
self.code += '.class public %s' % self.currentClass + '\n'
self.code += '.super java/lang/Object' + '\n'
self.code += '.method public <init>()V' + '\n'
self.code += 'aload_0' + '\n'
self.code += 'invokenonvirtual java/lang/Object/<init>()V' + '\n'
self.code += 'return' + '\n'
self.code += '.end method' + '\n'
self.code += '.method public static main([Ljava/lang/String;)V' + '\n'
self.code += '.limit stack 10000' + '\n'
def exitMainClass(self, ctx: MinijavaParser.MainClassContext):
self.code += "return" + '\n'
self.code += ".end method" + '\n'
self.codeStore[self.currentClass] = self.code
self.code = ""
def enterClassDeclaration(self, ctx:MinijavaParser.ClassDeclarationContext):
print("enterClassDeclaration")
self.isInitialized = False
self.currentClass = ctx.getChild(1).getText()
self.code += '.class public %s' % self.currentClass + '\n'
self.code += '.super java/lang/Object' + '\n'
def exitClassDeclaration(self, ctx:MinijavaParser.ClassDeclarationContext):
self.codeStore[self.currentClass] = self.code
self.code = ""
#todo other filed types
def enterFieldDeclaration(self, ctx:MinijavaParser.FieldDeclarationContext):
field_name = ctx.getChild(0).getChild(1).getText()
field_properties = self.symbolTable[self.currentClass][field_name]
field_type = field_properties['return_type']
field_type_representation = self.get_representation(field_type)
if field_type == 'int':
self.code += '.field private %s %s' % (field_name, field_type_representation) + '\n'
def enterMethodDeclaration(self, ctx:MinijavaParser.MethodDeclarationContext):
if not self.isInitialized:
self.code += '.method public <init>()V' + '\n'
self.code += 'aload_0' + '\n'
self.code += 'invokenonvirtual java/lang/Object/<init>()V' + '\n'
self.code += 'return' + '\n'
self.code += '.end method' + '\n'
method_type = ctx.getChild(1).getText()
self.currentMethod = ctx.getChild(2).getText()
self.code += '.method public %s' % self.currentMethod
if ctx.getChild(4).getText() == ')':
return_type_representation = self.get_representation(method_type)
self.code += '()%s' % return_type_representation + '\n'
def exitMethodDeclaration(self, ctx: MinijavaParser.MethodDeclarationContext):
self.code += '.end method' + '\n'
def enterParameterList(self, ctx:MinijavaParser.ParameterListContext):
self.code += '('
self.code += self.get_method_inp_type(self.currentMethod)
def exitParameterList(self, ctx: MinijavaParser.ParameterListContext):
method_type = self.get_method_type(self.currentMethod)
return_type_representation = self.get_representation(method_type)
self.code += ')%s' % return_type_representation + '\n'
def enterMethodBody(self, ctx:MinijavaParser.MethodBodyContext):
self.code += '.limit stack 10000' + '\n'
self.code += '.limit locals 1000' + '\n'
#todo implement .limit locals
self.code += ''
def exitMethodBody(self, ctx:MinijavaParser.MethodBodyContext):
method_type = self.get_method_type(self.currentMethod)
self.code += self.get_return_by_type(method_type) + '\n'
def exitNotExpression(self, ctx:MinijavaParser.NotExpressionContext):
self.code += 'ldc 1' + '\n'
self.code += 'ixor' + '\n'
def enterObjectInstantiationExpression(self, ctx:MinijavaParser.ObjectInstantiationExpressionContext):
object_class_name = ctx.getChild(1).getText()
self.code += 'new %s' % object_class_name + '\n'
self.code += 'dup' + '\n'
self.code += 'invokespecial %s/<init>()V' % object_class_name + '\n'
def exitObjectInstantiationExpression(self, ctx:MinijavaParser.ObjectInstantiationExpressionContext):
object_class_name = ctx.getChild(1).getText()
self.lastExpressionType = object_class_name
def exitMethodCallExpression(self, ctx: MinijavaParser.MethodCallExpressionContext):
#todo implement method inputs
method_name = ctx.getChild(2).getText()
class_properties = self.symbolTable[self.lastExpressionType][method_name]
input_types = self.get_method_inp_type(method_name, self.lastExpressionType)
return_type_representation = self.get_representation(class_properties["return_type"])
self.code += 'invokevirtual %s/%s(%s)%s' % (self.lastExpressionType, method_name, input_types, return_type_representation) + '\n'
def enterLocalDeclaration(self, ctx:MinijavaParser.LocalDeclarationContext):
#todo
var_name = ctx.getChild(0).getChild(1).getText()
var_properties= self.symbolTable[self.currentClass][var_name]
var_id = var_properties['id']
if var_properties['return_type'] == 'int':
self.code += 'bipush 0' + '\n'
self.code += 'istore %s' % var_id + '\n'
def enterVariableAssignmentStatement(self, ctx:MinijavaParser.VariableAssignmentStatementContext):
name = ctx.getChild(0).getText()
properties = self.symbolTable[self.currentClass][name]
type = properties['type']
if type == 'field':
self.code += 'aload 0 ; push this' + '\n'
def enterIfElseStatement(self, ctx:MinijavaParser.IfElseStatementContext):
lable = self.get_new_lable()
self.code += ''
#todo var type
def exitVariableAssignmentStatement(self, ctx:MinijavaParser.VariableAssignmentStatementContext):
name = ctx.getChild(0).getText()
properties = self.symbolTable[self.currentClass][name]
type = properties['type']
if type == 'field':
return_type = properties['return_type']
representation = self.get_representation(return_type)
self.code += 'putfield %s/%s %s' % (self.currentClass, name, representation) + '\n'
def exitPowExpression(self, ctx:MinijavaParser.PowExpressionContext):
#todo implement
print()
print("exitPowExpression")
self.code += "" + '\n'
def exitMulExpression(self, ctx:MinijavaParser.MulExpressionContext):
print()
print("exitMulExpression")
self.code += "imul" + '\n'
def exitBasicMathExpression(self, ctx:MinijavaParser.BasicMathExpressionContext):
print("exitBasicMathExpression")
type = ctx.getChild(1).getText()
if type == '+':
self.code += "iadd" + '\n'
elif type == '-':
self.code += "isub" + '\n'
def exitLtExpression(self, ctx:MinijavaParser.LtExpressionContext):
l1 = self.get_new_lable()
l2 = self.get_new_lable()
print()
print("enterLtExpression")
self.code += 'isub' + '\n'
self.code += 'ifle %s' % l1 + '\n'
self.code += 'ldc 0' + '\n'
self.code += 'goto %s' % l2 + '\n'
self.code += '%s:' % l1 + '\n'
self.code += 'ldc 1' + '\n'
self.code += '%s:' % l2 + '\n'
self.remove_last_lable()
self.remove_last_lable()
def enterIntLitExpression(self, ctx:MinijavaParser.IntLitExpressionContext):
literal = ctx.getChild(0).getText()
print("enterIntLitExpression %s" % literal)
self.code += "ldc %s" % literal + '\n'
def enterIdentifierExpression(self, ctx:MinijavaParser.IdentifierExpressionContext):
name = ctx.getChild(0).getText()
properties = self.symbolTable[self.currentClass][name]
type = properties['type']
if type == 'field':
return_type = properties['return_type']
representation = self.get_representation(return_type)
self.code += 'aload 0 ; push this' + '\n'
self.code += 'getfield %s/%s %s' % (self.currentClass, name, representation) + '\n'
elif type == 'var':
var_id = properties['id'] - 1
return_type = properties['return_type']
upcode = self.get_representation(return_type).lower() + 'load'
self.code += '%s %d' % (upcode, var_id) + '\n'
def enterPrintStatement(self, ctx: MinijavaParser.PrintStatementContext):
self.code += "getstatic java/lang/System/out Ljava/io/PrintStream;" + '\n'
def exitPrintStatement(self, ctx:MinijavaParser.PrintStatementContext):
self.code += "invokevirtual java/io/PrintStream/println(I)V" + '\n'
def enterAndExpression(self, ctx:MinijavaParser.AndExpressionContext):
print()
print("enterAndExpression")
self.code += ""