MethodCallExprAST.py revision 6999 
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,
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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        if methodId not in obj_type.methods:
101            #
102            # The initial method check has failed, but before generating an
103            # error we must check whether any of the paramTypes implement
104            # an interface.  If so, we must check if the method ids using
105            # the inherited types exist.
106            #
107            # This code is a temporary fix and only checks for the methodId
108            # where all paramTypes are converted to their inherited type.  The
109            # right way to do this is to replace slicc's simple string
110            # comparison for determining the correct overloaded method, with a
111            # more robust param by param check.
112            #
113            implemented_paramTypes = []
114            for paramType in paramTypes:
115                implemented_paramType = paramType
116                if paramType.isInterface:
117                    implements_interface = True
118                    implemented_paramType.abstract_ident = paramType["interface"]
119                else:
120                    implemented_paramType.abstract_ident = paramType.c_ident
121
122                implemented_paramTypes.append(implemented_paramType)
123
124            if implements_interface:
125                implementedMethodId = obj_type.methodIdAbstract(self.proc_name,
126                                                                implemented_paramTypes)
127            else:
128                implementedMethodId = ""
129
130            if implementedMethodId not in obj_type.methods:
131                self.error("Invalid method call: " \
132                           "Type '%s' does not have a method '%s' nor '%s'",
133                           obj_type, methodId, implementedMethodId)
134            else:
135                #
136                # Replace the methodId with the implementedMethodId found in
137                # the method list.
138                #
139                methodId = implementedMethodId
140
141        return_type = obj_type.methods[methodId].return_type
142        if return_type.isInterface:
143            prefix = "static_cast<%s &>" % return_type.c_ident
144        prefix = "%s((%s)." % (prefix, code)
145
146        return obj_type, methodId, prefix
147
148
149class ClassMethodCallExprAST(MethodCallExprAST):
150    def __init__(self, slicc, type_ast, proc_name, expr_ast_vec):
151        s = super(ClassMethodCallExprAST, self)
152        s.__init__(slicc, proc_name, expr_ast_vec)
153
154        self.type_ast = type_ast
155
156    def __repr__(self):
157        return "[MethodCallExpr: %r %r]" % (self.proc_name, self.expr_ast_vec)
158
159    def generate_prefix(self, paramTypes):
160
161        # class method call
162        prefix = "(%s::" % self.type_ast
163        obj_type = self.type_ast.type
164        methodId = obj_type.methodId(self.proc_name, paramTypes)
165
166        return obj_type, methodId, prefix
167
168__all__ = [ "MemberMethodCallExprAST", "ClassMethodCallExprAST" ]
169