MethodCallExprAST.py revision 11062 
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        func = obj_type.methods[methodId]
60        func.checkArguments(self.expr_ast_vec)
61
62        # Return the return type of the method
63        return obj_type.methods[methodId].return_type
64
65    def findResources(self, resources):
66        pass
67
68class MemberMethodCallExprAST(MethodCallExprAST):
69    def __init__(self, slicc, obj_expr_ast, func_call):
70        s = super(MemberMethodCallExprAST, self)
71        s.__init__(slicc, func_call.proc_name, func_call.exprs)
72        self.obj_expr_ast = obj_expr_ast
73
74    def __repr__(self):
75        return "[MethodCallExpr: %r%r %r]" % (self.proc_name,
76                                              self.obj_expr_ast,
77                                              self.expr_ast_vec)
78    def generate_prefix(self, paramTypes):
79        code = self.slicc.codeFormatter()
80
81        # member method call
82        obj_type = self.obj_expr_ast.generate(code)
83        methodId = obj_type.methodId(self.proc_name, paramTypes)
84
85        prefix = ""
86        implements_interface = False
87
88        if methodId in obj_type.methods:
89            return_type = obj_type.methods[methodId].return_type
90
91        else:
92            #
93            # Check whether the method is implemented by the super class
94            if "interface" in obj_type:
95                interface_type = self.symtab.find(obj_type["interface"]);
96
97                if methodId in interface_type.methods:
98                    return_type = interface_type.methods[methodId].return_type
99                    obj_type = interface_type
100
101                else:
102                    self.error("Invalid method call: " \
103                               "Type '%s' does not have a method %s, '%s'",
104                               obj_type, self.proc_name, methodId)
105
106            else:
107                  #
108                  # The initial method check has failed, but before generating an
109                  # error we must check whether any of the paramTypes implement
110                  # an interface.  If so, we must check if the method ids using
111                  # the inherited types exist.
112                  #
113                  # This code is a temporary fix and only checks for the methodId
114                  # where all paramTypes are converted to their inherited type.  The
115                  # right way to do this is to replace slicc's simple string
116                  # comparison for determining the correct overloaded method, with a
117                  # more robust param by param check.
118                  #
119                  implemented_paramTypes = []
120                  for paramType in paramTypes:
121                      implemented_paramType = paramType
122                      if paramType.isInterface:
123                          implements_interface = True
124                          implemented_paramType.abstract_ident = paramType["interface"]
125                      else:
126                          implemented_paramType.abstract_ident = paramType.c_ident
127
128                      implemented_paramTypes.append(implemented_paramType)
129
130                  implementedMethodId = ""
131                  if implements_interface:
132                      implementedMethodId = obj_type.methodIdAbstract(
133                              self.proc_name, implemented_paramTypes)
134
135                  if implementedMethodId not in obj_type.methods:
136                      self.error("Invalid method call: Type '%s' " \
137                                 "does not have a method %s, '%s' nor '%s'",
138                                 obj_type, self.proc_name, methodId,
139                                 implementedMethodId)
140
141                  # Replace the methodId with the implementedMethodId
142                  # found in the method list.
143                  methodId = implementedMethodId
144                  return_type = obj_type.methods[methodId].return_type
145
146        if str(obj_type) == "AbstractCacheEntry" or \
147           str(obj_type) == "AbstractEntry" or \
148           ("interface" in obj_type and (
149            obj_type["interface"] == "AbstractCacheEntry" or
150            obj_type["interface"] == "AbstractEntry")):
151            prefix = "%s((*(%s))." % (prefix, code)
152        else:
153            prefix = "%s((%s)." % (prefix, code)
154
155        return obj_type, methodId, prefix
156
157
158class ClassMethodCallExprAST(MethodCallExprAST):
159    def __init__(self, slicc, type_ast, proc_name, expr_ast_vec):
160        s = super(ClassMethodCallExprAST, self)
161        s.__init__(slicc, proc_name, expr_ast_vec)
162
163        self.type_ast = type_ast
164
165    def __repr__(self):
166        return "[MethodCallExpr: %r %r]" % (self.proc_name, self.expr_ast_vec)
167
168    def generate_prefix(self, paramTypes):
169
170        # class method call
171        prefix = "(%s::" % self.type_ast
172        obj_type = self.type_ast.type
173        methodId = obj_type.methodId(self.proc_name, paramTypes)
174
175        return obj_type, methodId, prefix
176
177__all__ = [ "MemberMethodCallExprAST", "ClassMethodCallExprAST" ]
178