xref: /gem5/src/mem/slicc/ast/ExprStatementAST.py

# Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
# Copyright (c) 2009 The Hewlett-Packard Development Company
# Copyright (c) 2013 Advanced Micro Devices, Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
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# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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from slicc.ast.StatementAST import StatementAST
from slicc.ast.LocalVariableAST import LocalVariableAST
from slicc.symbols import Type

class ExprStatementAST(StatementAST):
    def __init__(self, slicc, expr):
        super(ExprStatementAST, self).__init__(slicc)
        self.expr = expr

    def __repr__(self):
        return "[ExprStatementAST: %s]" % (self.expr)

    def generate(self, code, return_type):
        actual_type,rcode = self.expr.inline(True)
        code("$rcode;")

        # The return type must be void, except for local var decls
        if (not isinstance(self.expr, LocalVariableAST) and
            actual_type != self.symtab.find("void", Type)):
            self.expr.warning("Non-void return ignored, " + \
                "return type is '%s'", actual_type.ident)

    def findResources(self, resources):
        self.expr.findResources(resources)