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jondawson |
__author__ = "Jon Dawson"
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__copyright__ = "Copyright (C) 2012, Jonathan P Dawson"
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__version__ = "0.1"
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from parse_tree import *
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from tokens import Tokens
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from allocator import Allocator
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class Parser:
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"""Turn the C input file into a tree of expressions and statements."""
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def __init__(self, input_file, reuse, initialize_memory):
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self.scope = {}
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self.function = None
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self.loop = None
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self.tokens = Tokens(input_file)
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self.allocator = Allocator(reuse)
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self.structs = []
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self.initialize_memory = initialize_memory
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def parse_process(self):
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process = Process()
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process.allocator = self.allocator
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process.inputs = []
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process.outputs = []
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process.functions = []
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while not self.tokens.end():
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if self.tokens.peek() == "struct":
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self.parse_define_struct()
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elif self.tokens.peek() == "typedef":
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self.parse_typedef_struct()
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else:
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process.functions.append(self.parse_function())
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process.main = self.main
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return process
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def parse_type_specifier(self):
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type_specifiers = []
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while self.tokens.peek() in ["signed", "unsigned", "short", "long", "char", "int", "void"] + self.structs:
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type_specifiers.append(self.tokens.get())
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signed = True
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if "unsigned" in type_specifiers:
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signed = False
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if "signed" in type_specifiers:
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self.tokens.error("Cannot be signed and unsigned")
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size = 2
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if "long" in type_specifiers:
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if "short" in type_specifiers:
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self.tokens.error("Cannot be long and short")
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size = 4
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type_ = "int"
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for i in type_specifiers:
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if i in self.structs:
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type_ = i
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size = 2
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signed = False
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if "void" in type_specifiers:
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type_ = "void"
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size = 2
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signed = False
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return type_, size, signed
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def parse_function(self):
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function = Function()
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function.allocator = self.allocator
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stored_scope = self.scope
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type_, size, signed = self.parse_type_specifier()
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name = self.tokens.get()
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#check if it is a global declaration
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if self.tokens.peek() != "(":
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return self.parse_global_declaration(type_, size, signed, name)
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#otherwise continue parsing a function
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self.tokens.expect("(")
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function.name = name
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function.type_ = type_
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function.size = size
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function.signed = signed
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function.return_address = self.allocator.new(2, function.name+" return address")
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if type_ != "void":
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function.return_value = self.allocator.new(function.size, function.name+" return value")
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function.arguments = []
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while self.tokens.peek() != ")":
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argument_type, argument_size, argument_signed = self.parse_type_specifier()
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if argument_type in ["void"]:
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self.tokens.error("argument cannot be void")
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argument = self.tokens.get()
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element_type = None
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element_size = None
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element_signed = None
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if self.tokens.peek() == "[":
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self.tokens.expect("[")
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self.tokens.expect("]")
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element_type = argument_type
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element_size = argument_size
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element_signed = argument_signed
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argument_type+="[]"
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argument_size = 2
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argument_signed = False
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function.arguments.append(Argument(
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argument,
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argument_type,
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argument_size,
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argument_signed,
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self,
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element_type,
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element_size,
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element_signed))
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if self.tokens.peek() == ",":
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self.tokens.expect(",")
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else:
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break
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self.tokens.expect(")")
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self.function = function
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function.statement = self.parse_statement()
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if type_ != "void" and not hasattr(function, "return_statement"):
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self.tokens.error("Function must have a return statement")
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self.function = None
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self.scope = stored_scope
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self.scope[function.name] = function
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#main thread is last function
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self.main = function
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return function
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def parse_break(self):
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break_ = Break()
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break_.loop = self.loop
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self.tokens.expect("break")
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self.tokens.expect(";")
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return break_
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def parse_continue(self):
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continue_ = Continue()
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continue_.loop = self.loop
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self.tokens.expect("continue")
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self.tokens.expect(";")
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return continue_
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def parse_return(self):
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return_ = Return()
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return_.function = self.function
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self.function.return_statement = return_
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self.tokens.expect("return")
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if hasattr(self.function, "return_value"):
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return_.expression = self.parse_expression()
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self.tokens.expect(";")
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return return_
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def parse_assert(self):
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assert_ = Assert()
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assert_.allocator = self.allocator
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self.tokens.expect("assert")
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self.tokens.expect("(")
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assert_.expression = self.parse_expression()
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self.tokens.expect(")")
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self.tokens.expect(";")
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assert_.line = self.tokens.lineno
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assert_.filename = self.tokens.filename
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return assert_
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def parse_report(self):
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report_ = Report()
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report_.allocator = self.allocator
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self.tokens.expect("report")
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self.tokens.expect("(")
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report_.expression = self.parse_expression()
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self.tokens.expect(")")
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self.tokens.expect(";")
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report_.line = self.tokens.lineno
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report_.filename = self.tokens.filename
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return report_
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def parse_wait_clocks(self):
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wait_clocks = WaitClocks()
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wait_clocks.allocator = self.allocator
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self.tokens.expect("wait_clocks")
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self.tokens.expect("(")
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wait_clocks.expression = self.parse_expression()
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self.tokens.expect(")")
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self.tokens.expect(";")
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wait_clocks.line = self.tokens.lineno
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return wait_clocks
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def parse_statement(self):
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if self.tokens.peek() in ["unsigned", "int", "short", "long", "char"] + self.structs:
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return self.parse_compound_declaration()
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elif self.tokens.peek() == "struct":
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return self.parse_struct_declaration()
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elif self.tokens.peek() == "if":
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return self.parse_if()
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elif self.tokens.peek() == "while":
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return self.parse_while()
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elif self.tokens.peek() == "for":
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return self.parse_for()
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elif self.tokens.peek() == "return":
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return self.parse_return()
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elif self.tokens.peek() == "break":
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return self.parse_break()
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elif self.tokens.peek() == "continue":
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return self.parse_continue()
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elif self.tokens.peek() == "{":
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return self.parse_block()
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elif self.tokens.peek() == "assert":
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return self.parse_assert()
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elif self.tokens.peek() == "report":
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return self.parse_report()
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elif self.tokens.peek() == "switch":
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return self.parse_switch()
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elif self.tokens.peek() == "case":
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return self.parse_case()
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elif self.tokens.peek() == "default":
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return self.parse_default()
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elif self.tokens.peek() == "wait_clocks":
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return self.parse_wait_clocks()
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else:
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expression = self.parse_discard()
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self.tokens.expect(";")
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return expression
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def parse_discard(self):
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return DiscardExpression(self.parse_expression(), self.allocator)
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def parse_assignment(self):
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assignment_operators = [
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"=", "+=", "-=", "*=", "/=", "%=", "&=", "|=", "<<=", ">>="
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]
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lvalue = self.parse_ternary_expression()
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if self.tokens.peek() in assignment_operators:
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if not hasattr(lvalue, "declaration"):
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self.tokens.error(
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"left hand operand of assignment is not modifiable"
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)
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operator = self.tokens.get()
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if operator == "=":
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expression = self.parse_ternary_expression()
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else:
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expression = Binary(
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operator[:-1],
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lvalue,
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self.parse_ternary_expression(),
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self.allocator
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)
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if not compatible(lvalue.type_, expression.type_):
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self.tokens.error(
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"type mismatch in assignment"
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)
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return Assignment(lvalue, expression, self.allocator)
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else:
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return lvalue
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def parse_if(self):
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if_ = If()
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if_.allocator = self.allocator
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self.tokens.expect("if")
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self.tokens.expect("(")
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if_.expression = self.parse_expression()
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if if_.expression.type_ not in ["unsigned", "int", "short", "long", "char"]:
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self.tokens.error(
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"if statement conditional must be an integer like expression"
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)
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self.tokens.expect(")")
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if_.true_statement = self.parse_statement()
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if self.tokens.peek() == "else":
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self.tokens.expect("else")
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if_.false_statement = self.parse_statement()
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else:
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if_.false_statement = None
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return if_
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def parse_switch(self):
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switch = Switch()
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switch.cases = {}
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self.tokens.expect("switch")
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self.tokens.expect("(")
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expression = self.parse_expression()
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| 286 |
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if expression.type_ not in ["unsigned", "int", "short", "long", "char"]:
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| 287 |
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self.tokens.error(
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"switch statement expression must be an integer like expression"
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)
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self.tokens.expect(")")
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stored_loop = self.loop
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self.loop = switch
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statement = self.parse_statement()
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self.loop = stored_loop
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switch.expression = expression
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switch.allocator = self.allocator
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switch.statement = statement
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return switch
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def parse_case(self):
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self.tokens.expect("case")
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expression = self.parse_expression()
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if expression.type_ not in ["int"]:
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self.tokens.error(
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"case expression must be an integer like expression"
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)
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| 307 |
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self.tokens.expect(":")
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try:
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expression = value(expression)
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case = Case()
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self.loop.cases[expression] = case
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except NotConstant:
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self.tokens.error("case expression must be constant")
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except AttributeError:
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self.tokens.error(
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| 316 |
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"case statements may only be use inside a switch statment"
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)
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return case
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| 319 |
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| 320 |
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def parse_default(self):
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| 321 |
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self.tokens.expect("default")
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self.tokens.expect(":")
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default = Default()
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| 324 |
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if not hasattr(self.loop, "cases"):
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self.tokens.error(
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| 326 |
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"default statements may only be used inside a switch statment"
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)
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if hasattr(self.loop, "default"):
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self.tokens.error(
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"A switch statement may only have one default statement"
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)
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self.loop.default=default
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return default
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| 334 |
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| 335 |
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def parse_while(self):
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| 336 |
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loop = Loop()
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| 337 |
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self.tokens.expect("while")
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| 338 |
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self.tokens.expect("(")
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| 339 |
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expression = self.parse_expression()
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| 340 |
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self.tokens.expect(")")
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| 341 |
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stored_loop = self.loop
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| 342 |
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self.loop = loop
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| 343 |
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statement = self.parse_statement()
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| 344 |
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self.loop = stored_loop
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| 345 |
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| 346 |
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if_ = If()
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loop.statement = if_
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| 348 |
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break_ = Break()
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| 349 |
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break_.loop = loop
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| 350 |
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if_.allocator = self.allocator
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| 351 |
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if expression.type_ not in ["int"]:
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| 352 |
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self.tokens.error(
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| 353 |
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"if statement conditional must be an integer like expression"
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| 354 |
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)
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| 355 |
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if_.expression = expression
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| 356 |
|
|
if_.false_statement = break_
|
| 357 |
|
|
if_.true_statement = statement
|
| 358 |
|
|
|
| 359 |
|
|
return loop
|
| 360 |
|
|
|
| 361 |
|
|
def parse_for(self):
|
| 362 |
|
|
for_ = For()
|
| 363 |
|
|
for_.allocator = self.allocator
|
| 364 |
|
|
self.tokens.expect("for")
|
| 365 |
|
|
self.tokens.expect("(")
|
| 366 |
|
|
if self.tokens.peek() != ";":
|
| 367 |
|
|
for_.statement1 = self.parse_discard()
|
| 368 |
|
|
self.tokens.expect(";")
|
| 369 |
|
|
if self.tokens.peek() != ";":
|
| 370 |
|
|
for_.expression = self.parse_expression()
|
| 371 |
|
|
if for_.expression.type_ not in ["unsigned", "int", "short", "long", "char"]:
|
| 372 |
|
|
self.tokens.error(
|
| 373 |
|
|
"for statement conditional must be an integer like expression"
|
| 374 |
|
|
)
|
| 375 |
|
|
self.tokens.expect(";")
|
| 376 |
|
|
if self.tokens.peek() != ")":
|
| 377 |
|
|
for_.statement2 = self.parse_discard()
|
| 378 |
|
|
self.tokens.expect(")")
|
| 379 |
|
|
stored_loop = self.loop
|
| 380 |
|
|
self.loop = for_
|
| 381 |
|
|
for_.statement3 = self.parse_statement()
|
| 382 |
|
|
self.loop = stored_loop
|
| 383 |
|
|
return for_
|
| 384 |
|
|
|
| 385 |
|
|
def parse_block(self):
|
| 386 |
|
|
block = Block()
|
| 387 |
|
|
stored_scope = self.scope
|
| 388 |
|
|
self.tokens.expect("{")
|
| 389 |
|
|
block.statements = []
|
| 390 |
|
|
while self.tokens.peek() != "}":
|
| 391 |
|
|
block.statements.append(self.parse_statement())
|
| 392 |
|
|
self.tokens.expect("}")
|
| 393 |
|
|
self.scope = stored_scope
|
| 394 |
|
|
return block
|
| 395 |
|
|
|
| 396 |
|
|
def parse_struct_body(self):
|
| 397 |
|
|
self.tokens.expect("{")
|
| 398 |
|
|
members = {}
|
| 399 |
|
|
while self.tokens.peek() != "}":
|
| 400 |
|
|
type_, size, signed = self.parse_type_specifier()
|
| 401 |
|
|
name = self.tokens.get()
|
| 402 |
|
|
members[name] = self.parse_declaration(type_, size, signed, name)
|
| 403 |
|
|
self.tokens.expect(";")
|
| 404 |
|
|
self.tokens.expect("}")
|
| 405 |
|
|
return members
|
| 406 |
|
|
|
| 407 |
|
|
def parse_typedef_struct(self):
|
| 408 |
|
|
self.tokens.expect("typedef")
|
| 409 |
|
|
self.tokens.expect("struct")
|
| 410 |
|
|
declaration = StructDeclaration(self.parse_struct_body())
|
| 411 |
|
|
name = self.tokens.get()
|
| 412 |
|
|
self.tokens.expect(";")
|
| 413 |
|
|
self.scope[name] = declaration
|
| 414 |
|
|
self.structs.append(name)
|
| 415 |
|
|
|
| 416 |
|
|
def parse_define_struct(self):
|
| 417 |
|
|
self.tokens.expect("struct")
|
| 418 |
|
|
name = self.tokens.get()
|
| 419 |
|
|
declaration = StructDeclaration(self.parse_struct_body())
|
| 420 |
|
|
self.tokens.expect(";")
|
| 421 |
|
|
self.scope[name] = declaration
|
| 422 |
|
|
|
| 423 |
|
|
def parse_struct_declaration(self):
|
| 424 |
|
|
self.tokens.expect("struct")
|
| 425 |
|
|
struct_name = self.tokens.get()
|
| 426 |
|
|
name = self.tokens.get()
|
| 427 |
|
|
self.tokens.expect(";")
|
| 428 |
|
|
instance = self.scope[struct_name].instance()
|
| 429 |
|
|
self.scope[name] = instance
|
| 430 |
|
|
return instance
|
| 431 |
|
|
|
| 432 |
|
|
def parse_global_declaration(self, type_, size, signed, name):
|
| 433 |
|
|
instances = []
|
| 434 |
|
|
while True:
|
| 435 |
|
|
instance = self.parse_declaration(type_, size, signed, name).instance()
|
| 436 |
|
|
self.scope[name] = instance
|
| 437 |
|
|
instances.append(instance)
|
| 438 |
|
|
if self.tokens.peek() == ",":
|
| 439 |
|
|
self.tokens.expect(",")
|
| 440 |
|
|
else:
|
| 441 |
|
|
break
|
| 442 |
|
|
name = self.tokens.get()
|
| 443 |
|
|
self.tokens.expect(";")
|
| 444 |
|
|
return CompoundDeclaration(instances)
|
| 445 |
|
|
|
| 446 |
|
|
def parse_compound_declaration(self):
|
| 447 |
|
|
type_, size, signed = self.parse_type_specifier()
|
| 448 |
|
|
instances = []
|
| 449 |
|
|
while True:
|
| 450 |
|
|
name = self.tokens.get()
|
| 451 |
|
|
instance = self.parse_declaration(type_, size, signed, name).instance()
|
| 452 |
|
|
self.scope[name] = instance
|
| 453 |
|
|
instances.append(instance)
|
| 454 |
|
|
if self.tokens.peek() == ",":
|
| 455 |
|
|
self.tokens.expect(",")
|
| 456 |
|
|
else:
|
| 457 |
|
|
break
|
| 458 |
|
|
name = None
|
| 459 |
|
|
self.tokens.expect(";")
|
| 460 |
|
|
return CompoundDeclaration(instances)
|
| 461 |
|
|
|
| 462 |
|
|
def parse_declaration(self, type_, size, signed, name):
|
| 463 |
|
|
#struct declaration
|
| 464 |
|
|
if type_ in self.structs:
|
| 465 |
|
|
declaration = self.scope[type_]
|
| 466 |
|
|
elif type_ in ["int"]:
|
| 467 |
|
|
#array declaration
|
| 468 |
|
|
if self.tokens.peek() == "[":
|
| 469 |
|
|
array_size = None
|
| 470 |
|
|
self.tokens.expect("[")
|
| 471 |
|
|
if self.tokens.peek() != "]":
|
| 472 |
|
|
array_size = int(self.tokens.get())
|
| 473 |
|
|
self.tokens.expect("]")
|
| 474 |
|
|
initializer = None
|
| 475 |
|
|
if self.tokens.peek() == "=":
|
| 476 |
|
|
self.tokens.expect("=")
|
| 477 |
|
|
initializer = self.tokens.get()
|
| 478 |
|
|
initializer = [ord(i) for i in initializer.strip('"').decode("string_escape")] + [0]
|
| 479 |
|
|
array_size = len(initializer)
|
| 480 |
|
|
if array_size is None:
|
| 481 |
|
|
self.tokens.error("array size must be specified if not initialized")
|
| 482 |
|
|
array_type=type_+"[]"
|
| 483 |
|
|
initialize_memory = self.initialize_memory
|
| 484 |
|
|
declaration = ArrayDeclaration(self.allocator,
|
| 485 |
|
|
array_size,
|
| 486 |
|
|
array_type,
|
| 487 |
|
|
type_,
|
| 488 |
|
|
size,
|
| 489 |
|
|
signed,
|
| 490 |
|
|
initializer,
|
| 491 |
|
|
self.initialize_memory)
|
| 492 |
|
|
|
| 493 |
|
|
#simple variable declaration
|
| 494 |
|
|
else:
|
| 495 |
|
|
if self.tokens.peek() == "=":
|
| 496 |
|
|
self.tokens.expect("=")
|
| 497 |
|
|
initializer = self.parse_ternary_expression()
|
| 498 |
|
|
else:
|
| 499 |
|
|
initializer = Constant(0)
|
| 500 |
|
|
declaration = VariableDeclaration(
|
| 501 |
|
|
self.allocator,
|
| 502 |
|
|
initializer,
|
| 503 |
|
|
name,
|
| 504 |
|
|
type_,
|
| 505 |
|
|
size,
|
| 506 |
|
|
signed
|
| 507 |
|
|
)
|
| 508 |
|
|
|
| 509 |
|
|
return declaration
|
| 510 |
|
|
|
| 511 |
|
|
def parse_expression(self):
|
| 512 |
|
|
expression = self.parse_assignment()
|
| 513 |
|
|
return expression
|
| 514 |
|
|
|
| 515 |
|
|
def parse_ternary_expression(self):
|
| 516 |
|
|
expression = constant_fold(self.parse_or_expression())
|
| 517 |
|
|
while self.tokens.peek() in ["?"]:
|
| 518 |
|
|
self.tokens.expect("?")
|
| 519 |
|
|
true_expression = constant_fold(self.parse_or_expression())
|
| 520 |
|
|
self.tokens.expect(":")
|
| 521 |
|
|
false_expression = constant_fold(self.parse_or_expression())
|
| 522 |
|
|
expression = OR(AND(expression, true_expression), false_expression)
|
| 523 |
|
|
return expression
|
| 524 |
|
|
|
| 525 |
|
|
def parse_or_expression(self):
|
| 526 |
|
|
expression = self.parse_and_expression()
|
| 527 |
|
|
while self.tokens.peek() in ["||"]:
|
| 528 |
|
|
self.tokens.expect("||")
|
| 529 |
|
|
expression = OR(expression, self.parse_and_expression())
|
| 530 |
|
|
return expression
|
| 531 |
|
|
|
| 532 |
|
|
def parse_and_expression(self):
|
| 533 |
|
|
expression = self.parse_binary_expression(["|"])
|
| 534 |
|
|
while self.tokens.peek() in ["&&"]:
|
| 535 |
|
|
self.tokens.expect("&&")
|
| 536 |
|
|
expression = AND(expression, self.parse_binary_expression(["|"]))
|
| 537 |
|
|
return expression
|
| 538 |
|
|
|
| 539 |
|
|
def substitute_function(self, operator, left, right):
|
| 540 |
|
|
#Some things can't be implemented in verilog, substitute them with a function
|
| 541 |
|
|
if operator in ["/", "%"]:
|
| 542 |
|
|
function_call = FunctionCall()
|
| 543 |
|
|
function_call.arguments = [left, right]
|
| 544 |
|
|
if operator == "/":
|
| 545 |
|
|
if left.signed and right.signed:
|
| 546 |
|
|
if max(left.size, right.size) == 4:
|
| 547 |
|
|
function_call.function = self.scope["long_divide_xxxx"]
|
| 548 |
|
|
else:
|
| 549 |
|
|
function_call.function = self.scope["divide_xxxx"]
|
| 550 |
|
|
else:
|
| 551 |
|
|
if max(left.size, right.size) == 4:
|
| 552 |
|
|
function_call.function = self.scope["long_unsigned_divide_xxxx"]
|
| 553 |
|
|
else:
|
| 554 |
|
|
function_call.function = self.scope["unsigned_divide_xxxx"]
|
| 555 |
|
|
elif operator == "%":
|
| 556 |
|
|
if left.signed and right.signed:
|
| 557 |
|
|
if max(left.size, right.size) == 4:
|
| 558 |
|
|
function_call.function = self.scope["long_modulo_xxxx"]
|
| 559 |
|
|
else:
|
| 560 |
|
|
function_call.function = self.scope["modulo_xxxx"]
|
| 561 |
|
|
else:
|
| 562 |
|
|
if max(left.size, right.size) == 4:
|
| 563 |
|
|
function_call.function = self.scope["long_unsigned_modulo_xxxx"]
|
| 564 |
|
|
else:
|
| 565 |
|
|
function_call.function = self.scope["unsigned_modulo_xxxx"]
|
| 566 |
|
|
function_call.type_ = function_call.function.type_
|
| 567 |
|
|
function_call.size = function_call.function.size
|
| 568 |
|
|
function_call.signed = function_call.function.signed
|
| 569 |
|
|
return function_call
|
| 570 |
|
|
else:
|
| 571 |
|
|
return Binary(
|
| 572 |
|
|
operator,
|
| 573 |
|
|
left,
|
| 574 |
|
|
right,
|
| 575 |
|
|
self.allocator
|
| 576 |
|
|
)
|
| 577 |
|
|
|
| 578 |
|
|
def parse_binary_expression(self, operators):
|
| 579 |
|
|
operator_precedence = {
|
| 580 |
|
|
"|": ["^"],
|
| 581 |
|
|
"^": ["&"],
|
| 582 |
|
|
"&": ["==", "!="],
|
| 583 |
|
|
"==": ["<", ">", "<=", ">="],
|
| 584 |
|
|
"<": ["<<", ">>"],
|
| 585 |
|
|
"<<": ["+", "-"],
|
| 586 |
|
|
"+": ["*", "/", "%"],
|
| 587 |
|
|
}
|
| 588 |
|
|
if operators[0] not in operator_precedence:
|
| 589 |
|
|
expression = self.parse_unary_expression()
|
| 590 |
|
|
while self.tokens.peek() in operators:
|
| 591 |
|
|
operator = self.tokens.get()
|
| 592 |
|
|
right = self.parse_unary_expression()
|
| 593 |
|
|
expression = self.substitute_function(operator, expression, right)
|
| 594 |
|
|
return expression
|
| 595 |
|
|
else:
|
| 596 |
|
|
next_operators = operator_precedence[operators[0]]
|
| 597 |
|
|
expression = self.parse_binary_expression(next_operators)
|
| 598 |
|
|
while self.tokens.peek() in operators:
|
| 599 |
|
|
expression = Binary(
|
| 600 |
|
|
self.tokens.get(),
|
| 601 |
|
|
expression,
|
| 602 |
|
|
self.parse_binary_expression(next_operators),
|
| 603 |
|
|
self.allocator
|
| 604 |
|
|
)
|
| 605 |
|
|
return expression
|
| 606 |
|
|
|
| 607 |
|
|
def parse_unary_expression(self):
|
| 608 |
|
|
if self.tokens.peek() == "!":
|
| 609 |
|
|
operator = self.tokens.get()
|
| 610 |
|
|
expression = self.parse_postfix_expression()
|
| 611 |
|
|
return Binary("==", expression, Constant(0), self.allocator)
|
| 612 |
|
|
elif self.tokens.peek() == "-":
|
| 613 |
|
|
operator = self.tokens.get()
|
| 614 |
|
|
expression = self.parse_postfix_expression()
|
| 615 |
|
|
return Binary("-", Constant(0), expression, self.allocator)
|
| 616 |
|
|
elif self.tokens.peek() == "~":
|
| 617 |
|
|
operator = self.tokens.get()
|
| 618 |
|
|
expression = self.parse_postfix_expression()
|
| 619 |
|
|
return Unary("~", expression, self.allocator)
|
| 620 |
|
|
elif self.tokens.peek() == "sizeof":
|
| 621 |
|
|
operator = self.tokens.get()
|
| 622 |
|
|
expression = self.parse_unary_expression()
|
| 623 |
|
|
return SizeOf(expression)
|
| 624 |
|
|
else:
|
| 625 |
|
|
return self.parse_postfix_expression()
|
| 626 |
|
|
|
| 627 |
|
|
def parse_postfix_expression(self):
|
| 628 |
|
|
expression = self.parse_paren_expression()
|
| 629 |
|
|
while self.tokens.peek() in ["++", "--"]:
|
| 630 |
|
|
operator = self.tokens.get()
|
| 631 |
|
|
expression = PostIncrement(
|
| 632 |
|
|
operator[:-1],
|
| 633 |
|
|
expression,
|
| 634 |
|
|
self.allocator
|
| 635 |
|
|
)
|
| 636 |
|
|
return expression
|
| 637 |
|
|
|
| 638 |
|
|
def parse_paren_expression(self):
|
| 639 |
|
|
if self.tokens.peek() == "(":
|
| 640 |
|
|
self.tokens.expect("(")
|
| 641 |
|
|
expression = self.parse_expression()
|
| 642 |
|
|
self.tokens.expect(")")
|
| 643 |
|
|
else:
|
| 644 |
|
|
expression = self.parse_number_or_variable()
|
| 645 |
|
|
return expression
|
| 646 |
|
|
|
| 647 |
|
|
def parse_number_or_variable(self):
|
| 648 |
|
|
if self.tokens.peek()[0].isalpha():
|
| 649 |
|
|
name = self.tokens.get()
|
| 650 |
|
|
if self.tokens.peek() == "(":
|
| 651 |
|
|
return self.parse_function_call(name)
|
| 652 |
|
|
else:
|
| 653 |
|
|
return self.parse_variable(name)
|
| 654 |
|
|
else:
|
| 655 |
|
|
return self.parse_number()
|
| 656 |
|
|
|
| 657 |
|
|
def parse_file_read(self):
|
| 658 |
|
|
self.tokens.expect("(")
|
| 659 |
|
|
file_name = self.tokens.get()
|
| 660 |
|
|
file_name = file_name.strip('"').decode("string_escape")
|
| 661 |
|
|
self.tokens.expect(")")
|
| 662 |
|
|
return FileRead(file_name)
|
| 663 |
|
|
|
| 664 |
|
|
def parse_file_write(self):
|
| 665 |
|
|
self.tokens.expect("(")
|
| 666 |
|
|
expression = self.parse_expression()
|
| 667 |
|
|
self.tokens.expect(",")
|
| 668 |
|
|
file_name = self.tokens.get()
|
| 669 |
|
|
file_name = file_name.strip('"').decode("string_escape")
|
| 670 |
|
|
self.tokens.expect(")")
|
| 671 |
|
|
return FileWrite(file_name, expression)
|
| 672 |
|
|
|
| 673 |
|
|
def parse_input(self, name):
|
| 674 |
|
|
input_name = name.replace("input_", "")
|
| 675 |
|
|
self.tokens.expect("(")
|
| 676 |
|
|
self.tokens.expect(")")
|
| 677 |
|
|
return Input(input_name)
|
| 678 |
|
|
|
| 679 |
|
|
def parse_ready(self, name):
|
| 680 |
|
|
input_name = name.replace("ready_", "")
|
| 681 |
|
|
self.tokens.expect("(")
|
| 682 |
|
|
self.tokens.expect(")")
|
| 683 |
|
|
return Ready(input_name)
|
| 684 |
|
|
|
| 685 |
|
|
def parse_output(self, name):
|
| 686 |
|
|
output_name = name.replace("output_", "")
|
| 687 |
|
|
self.tokens.expect("(")
|
| 688 |
|
|
expression = self.parse_expression()
|
| 689 |
|
|
self.tokens.expect(")")
|
| 690 |
|
|
return Output(output_name, expression)
|
| 691 |
|
|
|
| 692 |
|
|
def parse_function_call(self, name):
|
| 693 |
|
|
if name.startswith("input_"):
|
| 694 |
|
|
return self.parse_input(name)
|
| 695 |
|
|
if name.startswith("ready_"):
|
| 696 |
|
|
return self.parse_ready(name)
|
| 697 |
|
|
if name.startswith("output_"):
|
| 698 |
|
|
return self.parse_output(name)
|
| 699 |
|
|
if name == "file_read":
|
| 700 |
|
|
return self.parse_file_read()
|
| 701 |
|
|
if name == "file_write":
|
| 702 |
|
|
return self.parse_file_write()
|
| 703 |
|
|
function_call = FunctionCall()
|
| 704 |
|
|
function_call.arguments = []
|
| 705 |
|
|
self.tokens.expect("(")
|
| 706 |
|
|
while self.tokens.peek() != ")":
|
| 707 |
|
|
function_call.arguments.append(self.parse_expression())
|
| 708 |
|
|
if self.tokens.peek() == ",":
|
| 709 |
|
|
self.tokens.expect(",")
|
| 710 |
|
|
else:
|
| 711 |
|
|
break
|
| 712 |
|
|
self.tokens.expect(")")
|
| 713 |
|
|
|
| 714 |
|
|
if name not in self.scope:
|
| 715 |
|
|
self.tokens.error("Unknown function: %s"%name)
|
| 716 |
|
|
|
| 717 |
|
|
function_call.function = self.scope[name]
|
| 718 |
|
|
function_call.type_ = function_call.function.type_
|
| 719 |
|
|
function_call.size = function_call.function.size
|
| 720 |
|
|
function_call.signed = function_call.function.signed
|
| 721 |
|
|
required_arguments = len(function_call.function.arguments)
|
| 722 |
|
|
actual_arguments = len(function_call.arguments)
|
| 723 |
|
|
if required_arguments != actual_arguments:
|
| 724 |
|
|
self.tokens.error("Function %s takes %s arguments %s given."%(
|
| 725 |
|
|
name,
|
| 726 |
|
|
len(function_call.function.arguments),
|
| 727 |
|
|
len(function_call.arguments)
|
| 728 |
|
|
))
|
| 729 |
|
|
required_arguments = function_call.function.arguments
|
| 730 |
|
|
actual_arguments = function_call.arguments
|
| 731 |
|
|
for required, actual in zip(required_arguments, actual_arguments):
|
| 732 |
|
|
if not compatible(required.type_, actual.type_):
|
| 733 |
|
|
self.tokens.error("Type mismatch expected type : %s got: %s."%(
|
| 734 |
|
|
required.type_,
|
| 735 |
|
|
actual.type_
|
| 736 |
|
|
))
|
| 737 |
|
|
|
| 738 |
|
|
|
| 739 |
|
|
return function_call
|
| 740 |
|
|
|
| 741 |
|
|
def parse_number(self):
|
| 742 |
|
|
token = self.tokens.get()
|
| 743 |
|
|
size = 2
|
| 744 |
|
|
signed = True
|
| 745 |
|
|
if token.startswith("'"):
|
| 746 |
|
|
try:
|
| 747 |
|
|
token = eval(token)
|
| 748 |
|
|
value = ord(token)
|
| 749 |
|
|
except SyntaxError:
|
| 750 |
|
|
self.tokens.error("%s is not a character literal"%token)
|
| 751 |
|
|
elif token.startswith('"'):
|
| 752 |
|
|
try:
|
| 753 |
|
|
initializer = [ord(i) for i in token.strip('"').decode("string_escape")] + [0]
|
| 754 |
|
|
size = len(initializer)
|
| 755 |
|
|
initialize_memory = self.initialize_memory
|
| 756 |
|
|
declaration = ArrayDeclaration(
|
| 757 |
|
|
self.allocator,
|
| 758 |
|
|
size,
|
| 759 |
|
|
"int[]",
|
| 760 |
|
|
"int",
|
| 761 |
|
|
2,
|
| 762 |
|
|
False,
|
| 763 |
|
|
initializer,
|
| 764 |
|
|
self.initialize_memory)
|
| 765 |
|
|
return declaration.instance()
|
| 766 |
|
|
except SyntaxError:
|
| 767 |
|
|
self.tokens.error("%s is not a character literal"%token)
|
| 768 |
|
|
else:
|
| 769 |
|
|
try:
|
| 770 |
|
|
if "U" in token.upper():
|
| 771 |
|
|
signed = False
|
| 772 |
|
|
if "L" in token.upper():
|
| 773 |
|
|
size = 4
|
| 774 |
|
|
token = token.upper().replace("U", "")
|
| 775 |
|
|
value = int(eval(token))
|
| 776 |
|
|
|
| 777 |
|
|
if signed:
|
| 778 |
|
|
if value > 2**((size * 8)-1) - 1:
|
| 779 |
|
|
self.tokens.error("value too large")
|
| 780 |
|
|
if value < -(2**((size * 8)-1)):
|
| 781 |
|
|
self.tokens.error("value too small")
|
| 782 |
|
|
else:
|
| 783 |
|
|
if value > 2**(size * 8) - 1:
|
| 784 |
|
|
self.tokens.error("value too large")
|
| 785 |
|
|
if value < 0:
|
| 786 |
|
|
self.tokens.error("value too small")
|
| 787 |
|
|
|
| 788 |
|
|
except SyntaxError:
|
| 789 |
|
|
self.tokens.error("%s is not an integer literal"%token)
|
| 790 |
|
|
return Constant(value, size, signed)
|
| 791 |
|
|
|
| 792 |
|
|
def parse_variable(self, name):
|
| 793 |
|
|
if name not in self.scope:
|
| 794 |
|
|
self.tokens.error("Unknown variable: %s"%name)
|
| 795 |
|
|
instance = self.scope[name]
|
| 796 |
|
|
return self.parse_variable_array_struct(instance)
|
| 797 |
|
|
|
| 798 |
|
|
def parse_variable_array_struct(self, instance):
|
| 799 |
|
|
if instance.type_ in ["unsigned", "int", "short", "long", "char"]:
|
| 800 |
|
|
return Variable(instance, self.allocator)
|
| 801 |
|
|
elif instance.type_.endswith("[]"):
|
| 802 |
|
|
if self.tokens.peek() == "[":
|
| 803 |
|
|
self.tokens.expect("[")
|
| 804 |
|
|
index_expression = self.parse_expression()
|
| 805 |
|
|
self.tokens.expect("]")
|
| 806 |
|
|
if index_expression.type_ not in ["unsigned", "int", "short", "long", "char"]:
|
| 807 |
|
|
self.tokens.error(
|
| 808 |
|
|
"array indices must be an integer like expression"
|
| 809 |
|
|
)
|
| 810 |
|
|
return ArrayIndex(instance, index_expression, self.allocator)
|
| 811 |
|
|
else:
|
| 812 |
|
|
return Array(instance, self.allocator)
|
| 813 |
|
|
elif instance.type_ == "struct":
|
| 814 |
|
|
self.tokens.expect(".")
|
| 815 |
|
|
member = self.tokens.get()
|
| 816 |
|
|
instance = instance.members[member]
|
| 817 |
|
|
return self.parse_variable_array_struct(instance)
|
| 818 |
|
|
|
| 819 |
|
|
def compatible(left, right):
|
| 820 |
|
|
return left == right
|
