MethodCallExprAST.py revision 6882 
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 m5.util import code_formatter
29
30from slicc.ast.ExprAST import ExprAST
31
32class MethodCallExprAST(ExprAST):
33    def __init__(self, slicc, proc_name, expr_ast_vec):
34        super(MethodCallExprAST, self).__init__(slicc)
35        self.proc_name = proc_name
36        self.expr_ast_vec = expr_ast_vec
37
38    def generate(self, code):
39        tmp = code_formatter()
40        paramTypes = []
41        for expr_ast in self.expr_ast_vec:
42            return_type = expr_ast.generate(tmp)
43            paramTypes.append(return_type)
44
45        obj_type, methodId, prefix = self.generate_prefix(paramTypes)
46
47        # generate code
48        params = []
49        for expr_ast in self.expr_ast_vec:
50            return_type,tcode = expr_ast.inline(True)
51            params.append(str(tcode))
52        fix = code.nofix()
53        code("$prefix${{self.proc_name}}(${{', '.join(params)}}))")
54        code.fix(fix)
55
56        # Verify that this is a method of the object
57        if methodId not in obj_type.methods:
58            self.error("Invalid method call: Type '%s' does not have a method '%s'",
59                       obj_type, methodId)
60
61        if len(self.expr_ast_vec) != \
62               len(obj_type.methods[methodId].param_types):
63            # Right number of parameters
64            self.error("Wrong number of parameters for function name: '%s', " + \
65                       "expected: , actual: ", proc_name,
66                  len(obj_type.methods[methodId].param_types),
67                  len(self.expr_ast_vec))
68
69        for actual_type, expected_type in \
70                zip(paramTypes, obj_type.methods[methodId].param_types):
71            if actual_type != expected_type and \
72                   str(actual_type["interface"]) != str(expected_type):
73                self.error("Type mismatch: expected: %s actual: %s",
74                           expected_type, actual_type)
75
76        # Return the return type of the method
77        return obj_type.methods[methodId].return_type
78
79    def findResources(self, resources):
80        pass
81
82class MemberMethodCallExprAST(MethodCallExprAST):
83    def __init__(self, slicc, obj_expr_ast, proc_name, expr_ast_vec):
84        s = super(MemberMethodCallExprAST, self)
85        s.__init__(slicc, proc_name, expr_ast_vec)
86
87        self.obj_expr_ast = obj_expr_ast
88
89    def __repr__(self):
90        return "[MethodCallExpr: %r%r %r]" % (self.proc_name,
91                                              self.obj_expr_ast,
92                                              self.expr_ast_vec)
93    def generate_prefix(self, paramTypes):
94        code = code_formatter()
95
96        # member method call
97        obj_type = self.obj_expr_ast.generate(code)
98        methodId = obj_type.methodId(self.proc_name, paramTypes)
99
100        prefix = ""
101        implements_interface = False
102        if methodId not in obj_type.methods:
103            #
104            # The initial method check has failed, but before generating an
105            # error we must check whether any of the paramTypes implement
106            # an interface.  If so, we must check if the method ids using
107            # the inherited types exist.
108            #
109            # This code is a temporary fix and only checks for the methodId
110            # where all paramTypes are converted to their inherited type.  The
111            # right way to do this is to replace slicc's simple string
112            # comparison for determining the correct overloaded method, with a
113            # more robust param by param check.
114            #
115            implemented_paramTypes = []
116            for paramType in paramTypes:
117                implemented_paramType = paramType
118                if paramType.isInterface:
119                    implements_interface = True
120                    implemented_paramType.abstract_ident = paramType["interface"]
121                else:
122                    implemented_paramType.abstract_ident = paramType.c_ident
123
124                implemented_paramTypes.append(implemented_paramType)
125
126            if implements_interface:
127                implementedMethodId = obj_type.methodIdAbstract(self.proc_name,
128                                                                implemented_paramTypes)
129            else:
130                implementedMethodId = ""
131
132            if implementedMethodId not in obj_type.methods:
133                self.error("Invalid method call: " \
134                           "Type '%s' does not have a method '%s' nor '%s'",
135                           obj_type, methodId, implementedMethodId)
136            else:
137                #
138                # Replace the methodId with the implementedMethodId found in
139                # the method list.
140                #
141                methodId = implementedMethodId
142
143        return_type = obj_type.methods[methodId].return_type
144        if return_type.isInterface:
145            prefix = "static_cast<%s &>" % return_type.c_ident
146        prefix = "%s((%s)." % (prefix, code)
147
148        return obj_type, methodId, prefix
149
150
151class ClassMethodCallExprAST(MethodCallExprAST):
152    def __init__(self, slicc, type_ast, proc_name, expr_ast_vec):
153        s = super(ClassMethodCallExprAST, self)
154        s.__init__(slicc, proc_name, expr_ast_vec)
155
156        self.type_ast = type_ast
157
158    def __repr__(self):
159        return "[MethodCallExpr: %r %r]" % (self.proc_name, self.expr_ast_vec)
160
161    def generate_prefix(self, paramTypes):
162
163        # class method call
164        prefix = "(%s::" % self.type_ast
165        obj_type = self.type_ast.type
166        methodId = obj_type.methodId(self.proc_name, paramTypes)
167
168        return obj_type, methodId, prefix
169
170__all__ = [ "MemberMethodCallExprAST", "ClassMethodCallExprAST" ]
171