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# Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
# Copyright (c) 2009 The Hewlett-Packard Development Company
# 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
# notice, this list of conditions and the following disclaimer in the
# 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
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
from slicc.ast.StatementAST import StatementAST
from slicc.symbols import Var
class PeekStatementAST(StatementAST):
def __init__(self, slicc, queue_name, type_ast, pairs, statements, method):
super(PeekStatementAST, self).__init__(slicc, pairs)
self.queue_name = queue_name
self.type_ast = type_ast
self.statements = statements
self.method = method
def __repr__(self):
return "[PeekStatementAST: %r queue_name: %r type: %r %r]" % \
(self.method, self.queue_name, self.type_ast, self.statements)
def generate(self, code, return_type):
self.symtab.pushFrame()
msg_type = self.type_ast.type
# Add new local var to symbol table
var = Var(self.symtab, "in_msg", self.location, msg_type, "(*in_msg_ptr)",
self.pairs)
self.symtab.newSymbol(var)
# Check the queue type
self.queue_name.assertType("InPort")
# Declare the new "in_msg_ptr" variable
mtid = msg_type.ident
qcode = self.queue_name.var.code
code('''
{
// Declare message
const $mtid* in_msg_ptr;
in_msg_ptr = dynamic_cast<const $mtid *>(($qcode).${{self.method}}());
assert(in_msg_ptr != NULL); // Check the cast result
''')
if self.pairs.has_key("block_on"):
address_field = self.pairs['block_on']
code('''
if ( (m_is_blocking == true) &&
(m_block_map.count(in_msg_ptr->m_$address_field) == 1) ) {
if (m_block_map[in_msg_ptr->m_$address_field] != &$qcode) {
$qcode.delayHead();
continue;
}
}
''')
# The other statements
self.statements.generate(code, return_type)
self.symtab.popFrame()
code("}")
def findResources(self, resources):
self.statements.findResources(resources)
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