FuncCallExprAST.py revision 6657
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.ExprAST import ExprAST 29from slicc.symbols import Func, Type 30 31class FuncCallExprAST(ExprAST): 32 def __init__(self, slicc, proc_name, exprs): 33 super(FuncCallExprAST, self).__init__(slicc) 34 self.proc_name = proc_name 35 self.exprs = exprs 36 37 def __repr__(self): 38 return "[FuncCallExpr: %s %s]" % (self.proc_name, self.exprs) 39 40 def generate(self, code): 41 machine = self.state_machine 42 43 # DEBUG_EXPR is strange since it takes parameters of multiple types 44 if self.proc_name == "DEBUG_EXPR": 45 # FIXME - check for number of parameters 46 code('DEBUG_SLICC(MedPrio, "$0: ", $1)', 47 self.exprs[0].location, self.exprs[0].inline()) 48 49 return self.symtab.find("void", Type) 50 51 # hack for adding comments to profileTransition 52 if self.proc_name == "APPEND_TRANSITION_COMMENT": 53 # FIXME - check for number of parameters 54 code("APPEND_TRANSITION_COMMENT($0)", self.exprs[0].inline()) 55 return self.symtab.find("void", Type) 56 57 # Look up the function in the symbol table 58 func = self.symtab.find(self.proc_name, Func) 59 60 # Check the types and get the code for the parameters 61 if func is None: 62 self.error("Unrecognized function name: '%s'", self.proc_name) 63 64 if len(self.exprs) != len(func.param_types): 65 self.error("Wrong number of arguments passed to function : '%s'" +\ 66 " Expected %d, got %d", self.proc_name, 67 len(func.param_types), len(self.exprs)) 68 69 cvec = [] 70 for expr,expected_type in zip(self.exprs, func.param_types): 71 # Check the types of the parameter 72 actual_type,param_code = expr.inline(True) 73 if actual_type != expected_type: 74 expr.error("Type mismatch: expected: %s actual: %s" % \ 75 (expected_type, actual_type)) 76 cvec.append(param_code) 77 78 # OK, the semantics of "trigger" here is that, ports in the 79 # machine have different priorities. We always check the first 80 # port for doable transitions. If nothing/stalled, we pick one 81 # from the next port. 82 # 83 # One thing we have to be careful as the SLICC protocol 84 # writter is : If a port have two or more transitions can be 85 # picked from in one cycle, they must be independent. 86 # Otherwise, if transition A and B mean to be executed in 87 # sequential, and A get stalled, transition B can be issued 88 # erroneously. In practice, in most case, there is only one 89 # transition should be executed in one cycle for a given 90 # port. So as most of current protocols. 91 92 if self.proc_name == "trigger": 93 code(''' 94{ 95 Address addr = ${{cvec[1]}}; 96 TransitionResult result = doTransition(${{cvec[0]}}, ${machine}_getState(addr), addr); 97 98 if (result == TransitionResult_Valid) { 99 counter++; 100 continue; // Check the first port again 101 } 102 103 if (result == TransitionResult_ResourceStall) { 104 g_eventQueue_ptr->scheduleEvent(this, 1); 105 106 // Cannot do anything with this transition, go check next doable transition (mostly likely of next port) 107 } 108} 109''') 110 elif self.proc_name == "doubleTrigger": 111 # NOTE: Use the doubleTrigger call with extreme caution 112 # the key to double trigger is the second event triggered 113 # cannot fail becuase the first event cannot be undone 114 assert len(cvec) == 4 115 code(''' 116{ 117 Address addr1 = ${{cvec[1]}}; 118 TransitionResult result1 = 119 doTransition(${{cvec[0]}}, ${machine}_getState(addr1), addr1); 120 121 if (result1 == TransitionResult_Valid) { 122 //this second event cannont fail because the first event 123 // already took effect 124 Address addr2 = ${{cvec[3]}}; 125 TransitionResult result2 = doTransition(${{cvec[2]}}, ${machine}_getState(addr2), addr2); 126 127 // ensure the event suceeded 128 assert(result2 == TransitionResult_Valid); 129 130 counter++; 131 continue; // Check the first port again 132 } 133 134 if (result1 == TransitionResult_ResourceStall) { 135 g_eventQueue_ptr->scheduleEvent(this, 1); 136 // Cannot do anything with this transition, go check next 137 // doable transition (mostly likely of next port) 138 } 139} 140''') 141 elif self.proc_name == "error": 142 code("$0", self.exprs[0].embedError(cvec[0])) 143 elif self.proc_name == "assert": 144 error = self.exprs[0].embedError('"assert failure"') 145 code(''' 146if (ASSERT_FLAG && !(${{cvec[0]}})) { 147 $error 148} 149''') 150 151 elif self.proc_name == "continueProcessing": 152 code("counter++;") 153 code("continue; // Check the first port again") 154 else: 155 # Normal function 156 157 # if the func is internal to the chip but not the machine 158 # then it can only be accessed through the chip pointer 159 internal = "" 160 if "external" not in func and not func.isInternalMachineFunc: 161 internal = "m_chip_ptr->" 162 163 params = ', '.join(str(c) for c in cvec) 164 fix = code.nofix() 165 code('(${internal}${{func.c_ident}}($params))') 166 code.fix(fix) 167 168 return func.return_type 169