PeekStatementAST.py revision 8641
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 slicc.ast.StatementAST import StatementAST 29from slicc.symbols import Var 30 31class PeekStatementAST(StatementAST): 32 def __init__(self, slicc, queue_name, type_ast, pairs, statements, method): 33 super(PeekStatementAST, self).__init__(slicc, pairs) 34 35 self.queue_name = queue_name 36 self.type_ast = type_ast 37 self.statements = statements 38 self.method = method 39 40 def __repr__(self): 41 return "[PeekStatementAST: %r queue_name: %r type: %r %r]" % \ 42 (self.method, self.queue_name, self.type_ast, self.statements) 43 44 def generate(self, code, return_type): 45 self.symtab.pushFrame() 46 47 msg_type = self.type_ast.type 48 49 # Add new local var to symbol table 50 var = Var(self.symtab, "in_msg", self.location, msg_type, "(*in_msg_ptr)", 51 self.pairs) 52 self.symtab.newSymbol(var) 53 54 # Check the queue type 55 self.queue_name.assertType("InPort") 56 57 # Declare the new "in_msg_ptr" variable 58 mtid = msg_type.ident 59 qcode = self.queue_name.var.code 60 code(''' 61{ 62 // Declare message 63 const $mtid* in_msg_ptr M5_VAR_USED; 64 in_msg_ptr = dynamic_cast<const $mtid *>(($qcode).${{self.method}}()); 65 assert(in_msg_ptr != NULL); // Check the cast result 66''') 67 68 if self.pairs.has_key("block_on"): 69 address_field = self.pairs['block_on'] 70 code(''' 71 if ( (m_is_blocking == true) && 72 (m_block_map.count(in_msg_ptr->m_$address_field) == 1) ) { 73 if (m_block_map[in_msg_ptr->m_$address_field] != &$qcode) { 74 $qcode.delayHead(); 75 continue; 76 } 77 } 78 ''') 79 80 if self.pairs.has_key("wake_up"): 81 address_field = self.pairs['wake_up'] 82 code(''' 83 if (m_waiting_buffers.count(in_msg_ptr->m_$address_field) > 0) { 84 wakeUpBuffers(in_msg_ptr->m_$address_field); 85 } 86 ''') 87 88 # The other statements 89 self.statements.generate(code, return_type) 90 self.symtab.popFrame() 91 code("}") 92 93 def findResources(self, resources): 94 self.statements.findResources(resources) 95