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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.ExprAST import ExprAST
from slicc.symbols import Func, Type
class FuncCallExprAST(ExprAST):
def __init__(self, slicc, proc_name, exprs):
super(FuncCallExprAST, self).__init__(slicc)
self.proc_name = proc_name
self.exprs = exprs
def __repr__(self):
return "[FuncCallExpr: %s %s]" % (self.proc_name, self.exprs)
def generate(self, code):
machine = self.state_machine
# DEBUG_EXPR is strange since it takes parameters of multiple types
if self.proc_name == "DEBUG_EXPR":
# FIXME - check for number of parameters
code('DEBUG_SLICC(MedPrio, "$0: ", $1)',
self.exprs[0].location, self.exprs[0].inline())
return self.symtab.find("void", Type)
# hack for adding comments to profileTransition
if self.proc_name == "APPEND_TRANSITION_COMMENT":
# FIXME - check for number of parameters
code("APPEND_TRANSITION_COMMENT($0)", self.exprs[0].inline())
return self.symtab.find("void", Type)
# Look up the function in the symbol table
func = self.symtab.find(self.proc_name, Func)
# Check the types and get the code for the parameters
if func is None:
self.error("Unrecognized function name: '%s'", self.proc_name)
if len(self.exprs) != len(func.param_types):
self.error("Wrong number of arguments passed to function : '%s'" +\
" Expected %d, got %d", self.proc_name,
len(func.param_types), len(self.exprs))
cvec = []
for expr,expected_type in zip(self.exprs, func.param_types):
# Check the types of the parameter
actual_type,param_code = expr.inline(True)
if actual_type != expected_type:
expr.error("Type mismatch: expected: %s actual: %s" % \
(expected_type, actual_type))
cvec.append(param_code)
# OK, the semantics of "trigger" here is that, ports in the
# machine have different priorities. We always check the first
# port for doable transitions. If nothing/stalled, we pick one
# from the next port.
#
# One thing we have to be careful as the SLICC protocol
# writter is : If a port have two or more transitions can be
# picked from in one cycle, they must be independent.
# Otherwise, if transition A and B mean to be executed in
# sequential, and A get stalled, transition B can be issued
# erroneously. In practice, in most case, there is only one
# transition should be executed in one cycle for a given
# port. So as most of current protocols.
if self.proc_name == "trigger":
code('''
{
Address addr = ${{cvec[1]}};
TransitionResult result = doTransition(${{cvec[0]}}, ${machine}_getState(addr), addr);
if (result == TransitionResult_Valid) {
counter++;
continue; // Check the first port again
}
if (result == TransitionResult_ResourceStall) {
g_eventQueue_ptr->scheduleEvent(this, 1);
// Cannot do anything with this transition, go check next doable transition (mostly likely of next port)
}
}
''')
elif self.proc_name == "doubleTrigger":
# NOTE: Use the doubleTrigger call with extreme caution
# the key to double trigger is the second event triggered
# cannot fail becuase the first event cannot be undone
assert len(cvec) == 4
code('''
{
Address addr1 = ${{cvec[1]}};
TransitionResult result1 =
doTransition(${{cvec[0]}}, ${machine}_getState(addr1), addr1);
if (result1 == TransitionResult_Valid) {
//this second event cannont fail because the first event
// already took effect
Address addr2 = ${{cvec[3]}};
TransitionResult result2 = doTransition(${{cvec[2]}}, ${machine}_getState(addr2), addr2);
// ensure the event suceeded
assert(result2 == TransitionResult_Valid);
counter++;
continue; // Check the first port again
}
if (result1 == TransitionResult_ResourceStall) {
g_eventQueue_ptr->scheduleEvent(this, 1);
// Cannot do anything with this transition, go check next
// doable transition (mostly likely of next port)
}
}
''')
elif self.proc_name == "error":
code("$0", self.exprs[0].embedError(cvec[0]))
elif self.proc_name == "assert":
error = self.exprs[0].embedError('"assert failure"')
code('''
if (ASSERT_FLAG && !(${{cvec[0]}})) {
$error
}
''')
elif self.proc_name == "continueProcessing":
code("counter++;")
code("continue; // Check the first port again")
else:
# Normal function
# if the func is internal to the chip but not the machine
# then it can only be accessed through the chip pointer
internal = ""
if "external" not in func and not func.isInternalMachineFunc:
internal = "m_chip_ptr->"
params = ', '.join(str(c) for c in cvec)
fix = code.nofix()
code('(${internal}${{func.c_ident}}($params))')
code.fix(fix)
return func.return_type
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