MethodCallExprAST.py revision 8644
1# Copyright (c) 1999-2008 Mark D. Hill and David A. Wood 2# Copyright (c) 2009 The Hewlett-Packard Development Company 3# All rights reserved. 4# 5# Redistribution and use in source and binary forms, with or without 6# modification, are permitted provided that the following conditions are 7# met: redistributions of source code must retain the above copyright 8# notice, this list of conditions and the following disclaimer; 9# redistributions in binary form must reproduce the above copyright 10# notice, this list of conditions and the following disclaimer in the 11# documentation and/or other materials provided with the distribution; 12# neither the name of the copyright holders nor the names of its 13# contributors may be used to endorse or promote products derived from 14# this software without specific prior written permission. 15# 16# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28from slicc.ast.ExprAST import ExprAST 29 30class MethodCallExprAST(ExprAST): 31 def __init__(self, slicc, proc_name, expr_ast_vec): 32 super(MethodCallExprAST, self).__init__(slicc) 33 self.proc_name = proc_name 34 self.expr_ast_vec = expr_ast_vec 35 36 def generate(self, code): 37 tmp = self.slicc.codeFormatter() 38 paramTypes = [] 39 for expr_ast in self.expr_ast_vec: 40 return_type = expr_ast.generate(tmp) 41 paramTypes.append(return_type) 42 43 obj_type, methodId, prefix = self.generate_prefix(paramTypes) 44 45 # generate code 46 params = [] 47 for expr_ast in self.expr_ast_vec: 48 return_type,tcode = expr_ast.inline(True) 49 params.append(str(tcode)) 50 fix = code.nofix() 51 code("$prefix${{self.proc_name}}(${{', '.join(params)}}))") 52 code.fix(fix) 53 54 # Verify that this is a method of the object 55 if methodId not in obj_type.methods: 56 self.error("Invalid method call: Type '%s' does not have a method '%s'", 57 obj_type, methodId) 58 59 if len(self.expr_ast_vec) != \ 60 len(obj_type.methods[methodId].param_types): 61 # Right number of parameters 62 self.error("Wrong number of parameters for function name: '%s', " + \ 63 "expected: , actual: ", proc_name, 64 len(obj_type.methods[methodId].param_types), 65 len(self.expr_ast_vec)) 66 67 for actual_type, expected_type in \ 68 zip(paramTypes, obj_type.methods[methodId].param_types): 69 if actual_type != expected_type and \ 70 str(actual_type["interface"]) != str(expected_type): 71 self.error("Type mismatch: expected: %s actual: %s", 72 expected_type, actual_type) 73 74 # Return the return type of the method 75 return obj_type.methods[methodId].return_type 76 77 def findResources(self, resources): 78 pass 79 80class MemberMethodCallExprAST(MethodCallExprAST): 81 def __init__(self, slicc, obj_expr_ast, proc_name, expr_ast_vec): 82 s = super(MemberMethodCallExprAST, self) 83 s.__init__(slicc, proc_name, expr_ast_vec) 84 85 self.obj_expr_ast = obj_expr_ast 86 87 def __repr__(self): 88 return "[MethodCallExpr: %r%r %r]" % (self.proc_name, 89 self.obj_expr_ast, 90 self.expr_ast_vec) 91 def generate_prefix(self, paramTypes): 92 code = self.slicc.codeFormatter() 93 94 # member method call 95 obj_type = self.obj_expr_ast.generate(code) 96 methodId = obj_type.methodId(self.proc_name, paramTypes) 97 98 prefix = "" 99 implements_interface = False 100 101 if methodId in obj_type.methods: 102 return_type = obj_type.methods[methodId].return_type 103 104 else: 105 # 106 # Check whether the method is implemented by the super class 107 if "interface" in obj_type: 108 interface_type = self.symtab.find(obj_type["interface"]); 109 110 if methodId in interface_type.methods: 111 return_type = interface_type.methods[methodId].return_type 112 obj_type = interface_type 113 114 else: 115 self.error("Invalid method call: " \ 116 "Type '%s' does not have a method %s, '%s'", 117 obj_type, self.proc_name, methodId) 118 119 else: 120 # 121 # The initial method check has failed, but before generating an 122 # error we must check whether any of the paramTypes implement 123 # an interface. If so, we must check if the method ids using 124 # the inherited types exist. 125 # 126 # This code is a temporary fix and only checks for the methodId 127 # where all paramTypes are converted to their inherited type. The 128 # right way to do this is to replace slicc's simple string 129 # comparison for determining the correct overloaded method, with a 130 # more robust param by param check. 131 # 132 implemented_paramTypes = [] 133 for paramType in paramTypes: 134 implemented_paramType = paramType 135 if paramType.isInterface: 136 implements_interface = True 137 implemented_paramType.abstract_ident = paramType["interface"] 138 else: 139 implemented_paramType.abstract_ident = paramType.c_ident 140 141 implemented_paramTypes.append(implemented_paramType) 142 143 if implements_interface: 144 implementedMethodId = obj_type.methodIdAbstract(self.proc_name, 145 implemented_paramTypes) 146 else: 147 implementedMethodId = "" 148 149 if implementedMethodId not in obj_type.methods: 150 self.error("Invalid method call: " \ 151 "Type '%s' does not have a method %s, '%s' nor '%s'", 152 obj_type, self.proc_name, methodId, implementedMethodId) 153 else: 154 # 155 # Replace the methodId with the implementedMethodId found in 156 # the method list. 157 # 158 methodId = implementedMethodId 159 return_type = obj_type.methods[methodId].return_type 160 161 if return_type.isInterface: 162 prefix = "static_cast<%s &>" % return_type.c_ident 163 164 if str(obj_type) == "AbstractCacheEntry" or \ 165 str(obj_type) == "AbstractEntry" or \ 166 ("interface" in obj_type and ( 167 obj_type["interface"] == "AbstractCacheEntry" or 168 obj_type["interface"] == "AbstractEntry")): 169 prefix = "%s((*(%s))." % (prefix, code) 170 else: 171 prefix = "%s((%s)." % (prefix, code) 172 173 return obj_type, methodId, prefix 174 175 176class ClassMethodCallExprAST(MethodCallExprAST): 177 def __init__(self, slicc, type_ast, proc_name, expr_ast_vec): 178 s = super(ClassMethodCallExprAST, self) 179 s.__init__(slicc, proc_name, expr_ast_vec) 180 181 self.type_ast = type_ast 182 183 def __repr__(self): 184 return "[MethodCallExpr: %r %r]" % (self.proc_name, self.expr_ast_vec) 185 186 def generate_prefix(self, paramTypes): 187 188 # class method call 189 prefix = "(%s::" % self.type_ast 190 obj_type = self.type_ast.type 191 methodId = obj_type.methodId(self.proc_name, paramTypes) 192 193 return obj_type, methodId, prefix 194 195__all__ = [ "MemberMethodCallExprAST", "ClassMethodCallExprAST" ] 196