MethodCallExprAST.py revision 11049:dfb0aa3f0649 
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                  implementedMethodId = ""
144                  if implements_interface:
145                      implementedMethodId = obj_type.methodIdAbstract(
146                              self.proc_name, implemented_paramTypes)
147
148                  if implementedMethodId not in obj_type.methods:
149                      self.error("Invalid method call: Type '%s' " \
150                                 "does not have a method %s, '%s' nor '%s'",
151                                 obj_type, self.proc_name, methodId,
152                                 implementedMethodId)
153
154                  # Replace the methodId with the implementedMethodId
155                  # found in the method list.
156                  methodId = implementedMethodId
157                  return_type = obj_type.methods[methodId].return_type
158
159        if str(obj_type) == "AbstractCacheEntry" or \
160           str(obj_type) == "AbstractEntry" or \
161           ("interface" in obj_type and (
162            obj_type["interface"] == "AbstractCacheEntry" or
163            obj_type["interface"] == "AbstractEntry")):
164            prefix = "%s((*(%s))." % (prefix, code)
165        else:
166            prefix = "%s((%s)." % (prefix, code)
167
168        return obj_type, methodId, prefix
169
170
171class ClassMethodCallExprAST(MethodCallExprAST):
172    def __init__(self, slicc, type_ast, proc_name, expr_ast_vec):
173        s = super(ClassMethodCallExprAST, self)
174        s.__init__(slicc, proc_name, expr_ast_vec)
175
176        self.type_ast = type_ast
177
178    def __repr__(self):
179        return "[MethodCallExpr: %r %r]" % (self.proc_name, self.expr_ast_vec)
180
181    def generate_prefix(self, paramTypes):
182
183        # class method call
184        prefix = "(%s::" % self.type_ast
185        obj_type = self.type_ast.type
186        methodId = obj_type.methodId(self.proc_name, paramTypes)
187
188        return obj_type, methodId, prefix
189
190__all__ = [ "MemberMethodCallExprAST", "ClassMethodCallExprAST" ]
191