src/mem/slicc/ast/ActionDeclAST.py

# Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
# Copyright (c) 2009 The Hewlett-Packard Development Company
# All rights reserved.
#
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# redistributions in binary form must reproduce the above copyright
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# this software without specific prior written permission.
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from slicc.ast.DeclAST import DeclAST
from slicc.symbols import Action, Type, Var


class ActionDeclAST(DeclAST):
    def __init__(self, slicc, ident, pairs, statement_list):
        super().__init__(slicc, pairs)
        self.ident = ident
        self.statement_list = statement_list

    def __repr__(self):
        return "[ActionDecl: %r]" % (self.ident)

    def generate(self):
        resources = {}

        machine = self.symtab.state_machine
        if machine is None:
            self.error("Action declaration not part of a machine.")

        if self.statement_list:
            # Add new local vars
            self.symtab.pushFrame()

            addr_type = self.symtab.find("Addr", Type)

            if addr_type is None:
                self.error("Type 'Addr' not declared.")

            var = Var(
                self.symtab,
                "address",
                self.location,
                addr_type,
                "addr",
                self.pairs,
            )
            self.symtab.newSymbol(var)

            if machine.TBEType != None:
                var = Var(
                    self.symtab,
                    "tbe",
                    self.location,
                    machine.TBEType,
                    "m_tbe_ptr",
                    self.pairs,
                )
                self.symtab.newSymbol(var)

            if machine.EntryType != None:
                var = Var(
                    self.symtab,
                    "cache_entry",
                    self.location,
                    machine.EntryType,
                    "m_cache_entry_ptr",
                    self.pairs,
                )
                self.symtab.newSymbol(var)

            # Do not allows returns in actions
            code = self.slicc.codeFormatter()
            self.statement_list.generate(code, None)
            self.pairs["c_code"] = str(code)

            self.statement_list.findResources(resources)

            self.symtab.popFrame()

        action = Action(
            self.symtab, self.ident, resources, self.location, self.pairs
        )
        machine.addAction(action)