219c423f1f
Make these names more meaningful. Specifically, made these substitutions: s/FP_Base_DepTag/FP_Reg_Base/g; s/Ctrl_Base_DepTag/Misc_Reg_Base/g; s/Max_DepTag/Max_Reg_Index/g;
2134 lines
77 KiB
Python
Executable file
2134 lines
77 KiB
Python
Executable file
# Copyright (c) 2003-2005 The Regents of The University of Michigan
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Authors: Steve Reinhardt
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import os
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import sys
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import re
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import string
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import inspect, traceback
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# get type names
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from types import *
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from m5.util.grammar import Grammar
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debug=False
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###################
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# Utility functions
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#
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# Indent every line in string 's' by two spaces
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# (except preprocessor directives).
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# Used to make nested code blocks look pretty.
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#
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def indent(s):
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return re.sub(r'(?m)^(?!#)', ' ', s)
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#
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# Munge a somewhat arbitrarily formatted piece of Python code
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# (e.g. from a format 'let' block) into something whose indentation
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# will get by the Python parser.
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#
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# The two keys here are that Python will give a syntax error if
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# there's any whitespace at the beginning of the first line, and that
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# all lines at the same lexical nesting level must have identical
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# indentation. Unfortunately the way code literals work, an entire
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# let block tends to have some initial indentation. Rather than
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# trying to figure out what that is and strip it off, we prepend 'if
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# 1:' to make the let code the nested block inside the if (and have
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# the parser automatically deal with the indentation for us).
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#
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# We don't want to do this if (1) the code block is empty or (2) the
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# first line of the block doesn't have any whitespace at the front.
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def fixPythonIndentation(s):
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# get rid of blank lines first
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s = re.sub(r'(?m)^\s*\n', '', s);
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if (s != '' and re.match(r'[ \t]', s[0])):
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s = 'if 1:\n' + s
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return s
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class ISAParserError(Exception):
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"""Error handler for parser errors"""
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def __init__(self, first, second=None):
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if second is None:
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self.lineno = 0
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self.string = first
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else:
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if hasattr(first, 'lexer'):
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first = first.lexer.lineno
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self.lineno = first
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self.string = second
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def display(self, filename_stack, print_traceback=debug):
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# Output formatted to work under Emacs compile-mode. Optional
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# 'print_traceback' arg, if set to True, prints a Python stack
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# backtrace too (can be handy when trying to debug the parser
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# itself).
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spaces = ""
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for (filename, line) in filename_stack[:-1]:
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print "%sIn file included from %s:" % (spaces, filename)
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spaces += " "
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# Print a Python stack backtrace if requested.
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if print_traceback or not self.lineno:
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traceback.print_exc()
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line_str = "%s:" % (filename_stack[-1][0], )
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if self.lineno:
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line_str += "%d:" % (self.lineno, )
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return "%s%s %s" % (spaces, line_str, self.string)
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def exit(self, filename_stack, print_traceback=debug):
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# Just call exit.
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sys.exit(self.display(filename_stack, print_traceback))
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def error(*args):
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raise ISAParserError(*args)
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####################
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# Template objects.
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#
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# Template objects are format strings that allow substitution from
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# the attribute spaces of other objects (e.g. InstObjParams instances).
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labelRE = re.compile(r'(?<!%)%\(([^\)]+)\)[sd]')
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class Template(object):
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def __init__(self, parser, t):
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self.parser = parser
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self.template = t
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def subst(self, d):
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myDict = None
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# Protect non-Python-dict substitutions (e.g. if there's a printf
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# in the templated C++ code)
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template = self.parser.protectNonSubstPercents(self.template)
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# CPU-model-specific substitutions are handled later (in GenCode).
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template = self.parser.protectCpuSymbols(template)
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# Build a dict ('myDict') to use for the template substitution.
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# Start with the template namespace. Make a copy since we're
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# going to modify it.
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myDict = self.parser.templateMap.copy()
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if isinstance(d, InstObjParams):
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# If we're dealing with an InstObjParams object, we need
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# to be a little more sophisticated. The instruction-wide
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# parameters are already formed, but the parameters which
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# are only function wide still need to be generated.
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compositeCode = ''
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myDict.update(d.__dict__)
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# The "operands" and "snippets" attributes of the InstObjParams
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# objects are for internal use and not substitution.
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del myDict['operands']
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del myDict['snippets']
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snippetLabels = [l for l in labelRE.findall(template)
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if d.snippets.has_key(l)]
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snippets = dict([(s, self.parser.mungeSnippet(d.snippets[s]))
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for s in snippetLabels])
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myDict.update(snippets)
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compositeCode = ' '.join(map(str, snippets.values()))
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# Add in template itself in case it references any
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# operands explicitly (like Mem)
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compositeCode += ' ' + template
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operands = SubOperandList(self.parser, compositeCode, d.operands)
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myDict['op_decl'] = operands.concatAttrStrings('op_decl')
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if operands.readPC or operands.setPC:
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myDict['op_decl'] += 'TheISA::PCState __parserAutoPCState;\n'
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# In case there are predicated register reads and write, declare
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# the variables for register indicies. It is being assumed that
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# all the operands in the OperandList are also in the
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# SubOperandList and in the same order. Otherwise, it is
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# expected that predication would not be used for the operands.
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if operands.predRead:
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myDict['op_decl'] += 'uint8_t _sourceIndex = 0;\n'
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if operands.predWrite:
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myDict['op_decl'] += 'uint8_t M5_VAR_USED _destIndex = 0;\n'
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is_src = lambda op: op.is_src
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is_dest = lambda op: op.is_dest
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myDict['op_src_decl'] = \
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operands.concatSomeAttrStrings(is_src, 'op_src_decl')
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myDict['op_dest_decl'] = \
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operands.concatSomeAttrStrings(is_dest, 'op_dest_decl')
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if operands.readPC:
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myDict['op_src_decl'] += \
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'TheISA::PCState __parserAutoPCState;\n'
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if operands.setPC:
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myDict['op_dest_decl'] += \
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'TheISA::PCState __parserAutoPCState;\n'
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myDict['op_rd'] = operands.concatAttrStrings('op_rd')
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if operands.readPC:
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myDict['op_rd'] = '__parserAutoPCState = xc->pcState();\n' + \
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myDict['op_rd']
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# Compose the op_wb string. If we're going to write back the
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# PC state because we changed some of its elements, we'll need to
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# do that as early as possible. That allows later uncoordinated
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# modifications to the PC to layer appropriately.
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reordered = list(operands.items)
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reordered.reverse()
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op_wb_str = ''
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pcWbStr = 'xc->pcState(__parserAutoPCState);\n'
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for op_desc in reordered:
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if op_desc.isPCPart() and op_desc.is_dest:
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op_wb_str = op_desc.op_wb + pcWbStr + op_wb_str
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pcWbStr = ''
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else:
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op_wb_str = op_desc.op_wb + op_wb_str
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myDict['op_wb'] = op_wb_str
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elif isinstance(d, dict):
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# if the argument is a dictionary, we just use it.
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myDict.update(d)
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elif hasattr(d, '__dict__'):
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# if the argument is an object, we use its attribute map.
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myDict.update(d.__dict__)
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else:
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raise TypeError, "Template.subst() arg must be or have dictionary"
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return template % myDict
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# Convert to string. This handles the case when a template with a
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# CPU-specific term gets interpolated into another template or into
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# an output block.
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def __str__(self):
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return self.parser.expandCpuSymbolsToString(self.template)
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################
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# Format object.
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#
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# A format object encapsulates an instruction format. It must provide
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# a defineInst() method that generates the code for an instruction
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# definition.
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class Format(object):
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def __init__(self, id, params, code):
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self.id = id
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self.params = params
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label = 'def format ' + id
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self.user_code = compile(fixPythonIndentation(code), label, 'exec')
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param_list = string.join(params, ", ")
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f = '''def defInst(_code, _context, %s):
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my_locals = vars().copy()
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exec _code in _context, my_locals
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return my_locals\n''' % param_list
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c = compile(f, label + ' wrapper', 'exec')
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exec c
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self.func = defInst
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def defineInst(self, parser, name, args, lineno):
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parser.updateExportContext()
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context = parser.exportContext.copy()
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if len(name):
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Name = name[0].upper()
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if len(name) > 1:
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Name += name[1:]
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context.update({ 'name' : name, 'Name' : Name })
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try:
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vars = self.func(self.user_code, context, *args[0], **args[1])
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except Exception, exc:
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if debug:
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raise
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error(lineno, 'error defining "%s": %s.' % (name, exc))
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for k in vars.keys():
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if k not in ('header_output', 'decoder_output',
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'exec_output', 'decode_block'):
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del vars[k]
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return GenCode(parser, **vars)
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# Special null format to catch an implicit-format instruction
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# definition outside of any format block.
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class NoFormat(object):
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def __init__(self):
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self.defaultInst = ''
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def defineInst(self, parser, name, args, lineno):
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error(lineno,
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'instruction definition "%s" with no active format!' % name)
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###############
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# GenCode class
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#
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# The GenCode class encapsulates generated code destined for various
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# output files. The header_output and decoder_output attributes are
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# strings containing code destined for decoder.hh and decoder.cc
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# respectively. The decode_block attribute contains code to be
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# incorporated in the decode function itself (that will also end up in
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# decoder.cc). The exec_output attribute is a dictionary with a key
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# for each CPU model name; the value associated with a particular key
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# is the string of code for that CPU model's exec.cc file. The
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# has_decode_default attribute is used in the decode block to allow
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# explicit default clauses to override default default clauses.
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class GenCode(object):
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# Constructor. At this point we substitute out all CPU-specific
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# symbols. For the exec output, these go into the per-model
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# dictionary. For all other output types they get collapsed into
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# a single string.
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def __init__(self, parser,
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header_output = '', decoder_output = '', exec_output = '',
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decode_block = '', has_decode_default = False):
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self.parser = parser
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self.header_output = parser.expandCpuSymbolsToString(header_output)
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self.decoder_output = parser.expandCpuSymbolsToString(decoder_output)
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if isinstance(exec_output, dict):
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self.exec_output = exec_output
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elif isinstance(exec_output, str):
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# If the exec_output arg is a single string, we replicate
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# it for each of the CPU models, substituting and
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# %(CPU_foo)s params appropriately.
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self.exec_output = parser.expandCpuSymbolsToDict(exec_output)
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self.decode_block = parser.expandCpuSymbolsToString(decode_block)
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self.has_decode_default = has_decode_default
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# Override '+' operator: generate a new GenCode object that
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# concatenates all the individual strings in the operands.
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def __add__(self, other):
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exec_output = {}
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for cpu in self.parser.cpuModels:
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n = cpu.name
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exec_output[n] = self.exec_output[n] + other.exec_output[n]
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return GenCode(self.parser,
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self.header_output + other.header_output,
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self.decoder_output + other.decoder_output,
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exec_output,
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self.decode_block + other.decode_block,
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self.has_decode_default or other.has_decode_default)
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# Prepend a string (typically a comment) to all the strings.
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def prepend_all(self, pre):
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self.header_output = pre + self.header_output
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self.decoder_output = pre + self.decoder_output
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self.decode_block = pre + self.decode_block
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for cpu in self.parser.cpuModels:
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self.exec_output[cpu.name] = pre + self.exec_output[cpu.name]
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# Wrap the decode block in a pair of strings (e.g., 'case foo:'
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# and 'break;'). Used to build the big nested switch statement.
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def wrap_decode_block(self, pre, post = ''):
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self.decode_block = pre + indent(self.decode_block) + post
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#####################################################################
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#
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# Bitfield Operator Support
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#
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#####################################################################
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bitOp1ArgRE = re.compile(r'<\s*(\w+)\s*:\s*>')
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bitOpWordRE = re.compile(r'(?<![\w\.])([\w\.]+)<\s*(\w+)\s*:\s*(\w+)\s*>')
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bitOpExprRE = re.compile(r'\)<\s*(\w+)\s*:\s*(\w+)\s*>')
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def substBitOps(code):
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# first convert single-bit selectors to two-index form
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# i.e., <n> --> <n:n>
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code = bitOp1ArgRE.sub(r'<\1:\1>', code)
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# simple case: selector applied to ID (name)
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# i.e., foo<a:b> --> bits(foo, a, b)
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code = bitOpWordRE.sub(r'bits(\1, \2, \3)', code)
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# if selector is applied to expression (ending in ')'),
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# we need to search backward for matching '('
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match = bitOpExprRE.search(code)
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while match:
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exprEnd = match.start()
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here = exprEnd - 1
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nestLevel = 1
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while nestLevel > 0:
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if code[here] == '(':
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nestLevel -= 1
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elif code[here] == ')':
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nestLevel += 1
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here -= 1
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if here < 0:
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sys.exit("Didn't find '('!")
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exprStart = here+1
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newExpr = r'bits(%s, %s, %s)' % (code[exprStart:exprEnd+1],
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match.group(1), match.group(2))
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code = code[:exprStart] + newExpr + code[match.end():]
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match = bitOpExprRE.search(code)
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return code
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#####################################################################
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#
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# Code Parser
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#
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# The remaining code is the support for automatically extracting
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# instruction characteristics from pseudocode.
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#
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#####################################################################
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# Force the argument to be a list. Useful for flags, where a caller
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# can specify a singleton flag or a list of flags. Also usful for
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# converting tuples to lists so they can be modified.
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def makeList(arg):
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if isinstance(arg, list):
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return arg
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elif isinstance(arg, tuple):
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return list(arg)
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elif not arg:
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return []
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else:
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return [ arg ]
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|
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class Operand(object):
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'''Base class for operand descriptors. An instance of this class
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(or actually a class derived from this one) represents a specific
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operand for a code block (e.g, "Rc.sq" as a dest). Intermediate
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derived classes encapsulates the traits of a particular operand
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type (e.g., "32-bit integer register").'''
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def buildReadCode(self, func = None):
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subst_dict = {"name": self.base_name,
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"func": func,
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"reg_idx": self.reg_spec,
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"ctype": self.ctype}
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if hasattr(self, 'src_reg_idx'):
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subst_dict['op_idx'] = self.src_reg_idx
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code = self.read_code % subst_dict
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return '%s = %s;\n' % (self.base_name, code)
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def buildWriteCode(self, func = None):
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subst_dict = {"name": self.base_name,
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"func": func,
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"reg_idx": self.reg_spec,
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"ctype": self.ctype,
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"final_val": self.base_name}
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if hasattr(self, 'dest_reg_idx'):
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subst_dict['op_idx'] = self.dest_reg_idx
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code = self.write_code % subst_dict
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return '''
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|
{
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%s final_val = %s;
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|
%s;
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if (traceData) { traceData->setData(final_val); }
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}''' % (self.dflt_ctype, self.base_name, code)
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|
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def __init__(self, parser, full_name, ext, is_src, is_dest):
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self.full_name = full_name
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self.ext = ext
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self.is_src = is_src
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self.is_dest = is_dest
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|
# The 'effective extension' (eff_ext) is either the actual
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# extension, if one was explicitly provided, or the default.
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|
if ext:
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self.eff_ext = ext
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elif hasattr(self, 'dflt_ext'):
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self.eff_ext = self.dflt_ext
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if hasattr(self, 'eff_ext'):
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self.ctype = parser.operandTypeMap[self.eff_ext]
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# Finalize additional fields (primarily code fields). This step
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|
# is done separately since some of these fields may depend on the
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# register index enumeration that hasn't been performed yet at the
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# time of __init__(). The register index enumeration is affected
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# by predicated register reads/writes. Hence, we forward the flags
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# that indicate whether or not predication is in use.
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def finalize(self, predRead, predWrite):
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self.flags = self.getFlags()
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self.constructor = self.makeConstructor(predRead, predWrite)
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self.op_decl = self.makeDecl()
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if self.is_src:
|
|
self.op_rd = self.makeRead(predRead)
|
|
self.op_src_decl = self.makeDecl()
|
|
else:
|
|
self.op_rd = ''
|
|
self.op_src_decl = ''
|
|
|
|
if self.is_dest:
|
|
self.op_wb = self.makeWrite(predWrite)
|
|
self.op_dest_decl = self.makeDecl()
|
|
else:
|
|
self.op_wb = ''
|
|
self.op_dest_decl = ''
|
|
|
|
def isMem(self):
|
|
return 0
|
|
|
|
def isReg(self):
|
|
return 0
|
|
|
|
def isFloatReg(self):
|
|
return 0
|
|
|
|
def isIntReg(self):
|
|
return 0
|
|
|
|
def isControlReg(self):
|
|
return 0
|
|
|
|
def isPCState(self):
|
|
return 0
|
|
|
|
def isPCPart(self):
|
|
return self.isPCState() and self.reg_spec
|
|
|
|
def hasReadPred(self):
|
|
return self.read_predicate != None
|
|
|
|
def hasWritePred(self):
|
|
return self.write_predicate != None
|
|
|
|
def getFlags(self):
|
|
# note the empty slice '[:]' gives us a copy of self.flags[0]
|
|
# instead of a reference to it
|
|
my_flags = self.flags[0][:]
|
|
if self.is_src:
|
|
my_flags += self.flags[1]
|
|
if self.is_dest:
|
|
my_flags += self.flags[2]
|
|
return my_flags
|
|
|
|
def makeDecl(self):
|
|
# Note that initializations in the declarations are solely
|
|
# to avoid 'uninitialized variable' errors from the compiler.
|
|
return self.ctype + ' ' + self.base_name + ' = 0;\n';
|
|
|
|
class IntRegOperand(Operand):
|
|
def isReg(self):
|
|
return 1
|
|
|
|
def isIntReg(self):
|
|
return 1
|
|
|
|
def makeConstructor(self, predRead, predWrite):
|
|
c_src = ''
|
|
c_dest = ''
|
|
|
|
if self.is_src:
|
|
c_src = '\n\t_srcRegIdx[_numSrcRegs++] = %s;' % (self.reg_spec)
|
|
if self.hasReadPred():
|
|
c_src = '\n\tif (%s) {%s\n\t}' % \
|
|
(self.read_predicate, c_src)
|
|
|
|
if self.is_dest:
|
|
c_dest = '\n\t_destRegIdx[_numDestRegs++] = %s;' % \
|
|
(self.reg_spec)
|
|
c_dest += '\n\t_numIntDestRegs++;'
|
|
if self.hasWritePred():
|
|
c_dest = '\n\tif (%s) {%s\n\t}' % \
|
|
(self.write_predicate, c_dest)
|
|
|
|
return c_src + c_dest
|
|
|
|
def makeRead(self, predRead):
|
|
if (self.ctype == 'float' or self.ctype == 'double'):
|
|
error('Attempt to read integer register as FP')
|
|
if self.read_code != None:
|
|
return self.buildReadCode('readIntRegOperand')
|
|
|
|
int_reg_val = ''
|
|
if predRead:
|
|
int_reg_val = 'xc->readIntRegOperand(this, _sourceIndex++)'
|
|
if self.hasReadPred():
|
|
int_reg_val = '(%s) ? %s : 0' % \
|
|
(self.read_predicate, int_reg_val)
|
|
else:
|
|
int_reg_val = 'xc->readIntRegOperand(this, %d)' % self.src_reg_idx
|
|
|
|
return '%s = %s;\n' % (self.base_name, int_reg_val)
|
|
|
|
def makeWrite(self, predWrite):
|
|
if (self.ctype == 'float' or self.ctype == 'double'):
|
|
error('Attempt to write integer register as FP')
|
|
if self.write_code != None:
|
|
return self.buildWriteCode('setIntRegOperand')
|
|
|
|
if predWrite:
|
|
wp = 'true'
|
|
if self.hasWritePred():
|
|
wp = self.write_predicate
|
|
|
|
wcond = 'if (%s)' % (wp)
|
|
windex = '_destIndex++'
|
|
else:
|
|
wcond = ''
|
|
windex = '%d' % self.dest_reg_idx
|
|
|
|
wb = '''
|
|
%s
|
|
{
|
|
%s final_val = %s;
|
|
xc->setIntRegOperand(this, %s, final_val);\n
|
|
if (traceData) { traceData->setData(final_val); }
|
|
}''' % (wcond, self.ctype, self.base_name, windex)
|
|
|
|
return wb
|
|
|
|
class FloatRegOperand(Operand):
|
|
def isReg(self):
|
|
return 1
|
|
|
|
def isFloatReg(self):
|
|
return 1
|
|
|
|
def makeConstructor(self, predRead, predWrite):
|
|
c_src = ''
|
|
c_dest = ''
|
|
|
|
if self.is_src:
|
|
c_src = '\n\t_srcRegIdx[_numSrcRegs++] = %s + FP_Reg_Base;' % \
|
|
(self.reg_spec)
|
|
|
|
if self.is_dest:
|
|
c_dest = \
|
|
'\n\t_destRegIdx[_numDestRegs++] = %s + FP_Reg_Base;' % \
|
|
(self.reg_spec)
|
|
c_dest += '\n\t_numFPDestRegs++;'
|
|
|
|
return c_src + c_dest
|
|
|
|
def makeRead(self, predRead):
|
|
bit_select = 0
|
|
if (self.ctype == 'float' or self.ctype == 'double'):
|
|
func = 'readFloatRegOperand'
|
|
else:
|
|
func = 'readFloatRegOperandBits'
|
|
if self.read_code != None:
|
|
return self.buildReadCode(func)
|
|
|
|
if predRead:
|
|
rindex = '_sourceIndex++'
|
|
else:
|
|
rindex = '%d' % self.src_reg_idx
|
|
|
|
return '%s = xc->%s(this, %s);\n' % \
|
|
(self.base_name, func, rindex)
|
|
|
|
def makeWrite(self, predWrite):
|
|
if (self.ctype == 'float' or self.ctype == 'double'):
|
|
func = 'setFloatRegOperand'
|
|
else:
|
|
func = 'setFloatRegOperandBits'
|
|
if self.write_code != None:
|
|
return self.buildWriteCode(func)
|
|
|
|
if predWrite:
|
|
wp = '_destIndex++'
|
|
else:
|
|
wp = '%d' % self.dest_reg_idx
|
|
wp = 'xc->%s(this, %s, final_val);' % (func, wp)
|
|
|
|
wb = '''
|
|
{
|
|
%s final_val = %s;
|
|
%s\n
|
|
if (traceData) { traceData->setData(final_val); }
|
|
}''' % (self.ctype, self.base_name, wp)
|
|
return wb
|
|
|
|
class ControlRegOperand(Operand):
|
|
def isReg(self):
|
|
return 1
|
|
|
|
def isControlReg(self):
|
|
return 1
|
|
|
|
def makeConstructor(self, predRead, predWrite):
|
|
c_src = ''
|
|
c_dest = ''
|
|
|
|
if self.is_src:
|
|
c_src = \
|
|
'\n\t_srcRegIdx[_numSrcRegs++] = %s + Misc_Reg_Base;' % \
|
|
(self.reg_spec)
|
|
|
|
if self.is_dest:
|
|
c_dest = \
|
|
'\n\t_destRegIdx[_numDestRegs++] = %s + Misc_Reg_Base;' % \
|
|
(self.reg_spec)
|
|
|
|
return c_src + c_dest
|
|
|
|
def makeRead(self, predRead):
|
|
bit_select = 0
|
|
if (self.ctype == 'float' or self.ctype == 'double'):
|
|
error('Attempt to read control register as FP')
|
|
if self.read_code != None:
|
|
return self.buildReadCode('readMiscRegOperand')
|
|
|
|
if predRead:
|
|
rindex = '_sourceIndex++'
|
|
else:
|
|
rindex = '%d' % self.src_reg_idx
|
|
|
|
return '%s = xc->readMiscRegOperand(this, %s);\n' % \
|
|
(self.base_name, rindex)
|
|
|
|
def makeWrite(self, predWrite):
|
|
if (self.ctype == 'float' or self.ctype == 'double'):
|
|
error('Attempt to write control register as FP')
|
|
if self.write_code != None:
|
|
return self.buildWriteCode('setMiscRegOperand')
|
|
|
|
if predWrite:
|
|
windex = '_destIndex++'
|
|
else:
|
|
windex = '%d' % self.dest_reg_idx
|
|
|
|
wb = 'xc->setMiscRegOperand(this, %s, %s);\n' % \
|
|
(windex, self.base_name)
|
|
wb += 'if (traceData) { traceData->setData(%s); }' % \
|
|
self.base_name
|
|
|
|
return wb
|
|
|
|
class MemOperand(Operand):
|
|
def isMem(self):
|
|
return 1
|
|
|
|
def makeConstructor(self, predRead, predWrite):
|
|
return ''
|
|
|
|
def makeDecl(self):
|
|
# Note that initializations in the declarations are solely
|
|
# to avoid 'uninitialized variable' errors from the compiler.
|
|
# Declare memory data variable.
|
|
return '%s %s = 0;\n' % (self.ctype, self.base_name)
|
|
|
|
def makeRead(self, predRead):
|
|
if self.read_code != None:
|
|
return self.buildReadCode()
|
|
return ''
|
|
|
|
def makeWrite(self, predWrite):
|
|
if self.write_code != None:
|
|
return self.buildWriteCode()
|
|
return ''
|
|
|
|
class PCStateOperand(Operand):
|
|
def makeConstructor(self, predRead, predWrite):
|
|
return ''
|
|
|
|
def makeRead(self, predRead):
|
|
if self.reg_spec:
|
|
# A component of the PC state.
|
|
return '%s = __parserAutoPCState.%s();\n' % \
|
|
(self.base_name, self.reg_spec)
|
|
else:
|
|
# The whole PC state itself.
|
|
return '%s = xc->pcState();\n' % self.base_name
|
|
|
|
def makeWrite(self, predWrite):
|
|
if self.reg_spec:
|
|
# A component of the PC state.
|
|
return '__parserAutoPCState.%s(%s);\n' % \
|
|
(self.reg_spec, self.base_name)
|
|
else:
|
|
# The whole PC state itself.
|
|
return 'xc->pcState(%s);\n' % self.base_name
|
|
|
|
def makeDecl(self):
|
|
ctype = 'TheISA::PCState'
|
|
if self.isPCPart():
|
|
ctype = self.ctype
|
|
return "%s %s;\n" % (ctype, self.base_name)
|
|
|
|
def isPCState(self):
|
|
return 1
|
|
|
|
class OperandList(object):
|
|
'''Find all the operands in the given code block. Returns an operand
|
|
descriptor list (instance of class OperandList).'''
|
|
def __init__(self, parser, code):
|
|
self.items = []
|
|
self.bases = {}
|
|
# delete strings and comments so we don't match on operands inside
|
|
for regEx in (stringRE, commentRE):
|
|
code = regEx.sub('', code)
|
|
# search for operands
|
|
next_pos = 0
|
|
while 1:
|
|
match = parser.operandsRE.search(code, next_pos)
|
|
if not match:
|
|
# no more matches: we're done
|
|
break
|
|
op = match.groups()
|
|
# regexp groups are operand full name, base, and extension
|
|
(op_full, op_base, op_ext) = op
|
|
# if the token following the operand is an assignment, this is
|
|
# a destination (LHS), else it's a source (RHS)
|
|
is_dest = (assignRE.match(code, match.end()) != None)
|
|
is_src = not is_dest
|
|
# see if we've already seen this one
|
|
op_desc = self.find_base(op_base)
|
|
if op_desc:
|
|
if op_desc.ext != op_ext:
|
|
error('Inconsistent extensions for operand %s' % \
|
|
op_base)
|
|
op_desc.is_src = op_desc.is_src or is_src
|
|
op_desc.is_dest = op_desc.is_dest or is_dest
|
|
else:
|
|
# new operand: create new descriptor
|
|
op_desc = parser.operandNameMap[op_base](parser,
|
|
op_full, op_ext, is_src, is_dest)
|
|
self.append(op_desc)
|
|
# start next search after end of current match
|
|
next_pos = match.end()
|
|
self.sort()
|
|
# enumerate source & dest register operands... used in building
|
|
# constructor later
|
|
self.numSrcRegs = 0
|
|
self.numDestRegs = 0
|
|
self.numFPDestRegs = 0
|
|
self.numIntDestRegs = 0
|
|
self.numMiscDestRegs = 0
|
|
self.memOperand = None
|
|
|
|
# Flags to keep track if one or more operands are to be read/written
|
|
# conditionally.
|
|
self.predRead = False
|
|
self.predWrite = False
|
|
|
|
for op_desc in self.items:
|
|
if op_desc.isReg():
|
|
if op_desc.is_src:
|
|
op_desc.src_reg_idx = self.numSrcRegs
|
|
self.numSrcRegs += 1
|
|
if op_desc.is_dest:
|
|
op_desc.dest_reg_idx = self.numDestRegs
|
|
self.numDestRegs += 1
|
|
if op_desc.isFloatReg():
|
|
self.numFPDestRegs += 1
|
|
elif op_desc.isIntReg():
|
|
self.numIntDestRegs += 1
|
|
elif op_desc.isControlReg():
|
|
self.numMiscDestRegs += 1
|
|
elif op_desc.isMem():
|
|
if self.memOperand:
|
|
error("Code block has more than one memory operand.")
|
|
self.memOperand = op_desc
|
|
|
|
# Check if this operand has read/write predication. If true, then
|
|
# the microop will dynamically index source/dest registers.
|
|
self.predRead = self.predRead or op_desc.hasReadPred()
|
|
self.predWrite = self.predWrite or op_desc.hasWritePred()
|
|
|
|
if parser.maxInstSrcRegs < self.numSrcRegs:
|
|
parser.maxInstSrcRegs = self.numSrcRegs
|
|
if parser.maxInstDestRegs < self.numDestRegs:
|
|
parser.maxInstDestRegs = self.numDestRegs
|
|
if parser.maxMiscDestRegs < self.numMiscDestRegs:
|
|
parser.maxMiscDestRegs = self.numMiscDestRegs
|
|
|
|
# now make a final pass to finalize op_desc fields that may depend
|
|
# on the register enumeration
|
|
for op_desc in self.items:
|
|
op_desc.finalize(self.predRead, self.predWrite)
|
|
|
|
def __len__(self):
|
|
return len(self.items)
|
|
|
|
def __getitem__(self, index):
|
|
return self.items[index]
|
|
|
|
def append(self, op_desc):
|
|
self.items.append(op_desc)
|
|
self.bases[op_desc.base_name] = op_desc
|
|
|
|
def find_base(self, base_name):
|
|
# like self.bases[base_name], but returns None if not found
|
|
# (rather than raising exception)
|
|
return self.bases.get(base_name)
|
|
|
|
# internal helper function for concat[Some]Attr{Strings|Lists}
|
|
def __internalConcatAttrs(self, attr_name, filter, result):
|
|
for op_desc in self.items:
|
|
if filter(op_desc):
|
|
result += getattr(op_desc, attr_name)
|
|
return result
|
|
|
|
# return a single string that is the concatenation of the (string)
|
|
# values of the specified attribute for all operands
|
|
def concatAttrStrings(self, attr_name):
|
|
return self.__internalConcatAttrs(attr_name, lambda x: 1, '')
|
|
|
|
# like concatAttrStrings, but only include the values for the operands
|
|
# for which the provided filter function returns true
|
|
def concatSomeAttrStrings(self, filter, attr_name):
|
|
return self.__internalConcatAttrs(attr_name, filter, '')
|
|
|
|
# return a single list that is the concatenation of the (list)
|
|
# values of the specified attribute for all operands
|
|
def concatAttrLists(self, attr_name):
|
|
return self.__internalConcatAttrs(attr_name, lambda x: 1, [])
|
|
|
|
# like concatAttrLists, but only include the values for the operands
|
|
# for which the provided filter function returns true
|
|
def concatSomeAttrLists(self, filter, attr_name):
|
|
return self.__internalConcatAttrs(attr_name, filter, [])
|
|
|
|
def sort(self):
|
|
self.items.sort(lambda a, b: a.sort_pri - b.sort_pri)
|
|
|
|
class SubOperandList(OperandList):
|
|
'''Find all the operands in the given code block. Returns an operand
|
|
descriptor list (instance of class OperandList).'''
|
|
def __init__(self, parser, code, master_list):
|
|
self.items = []
|
|
self.bases = {}
|
|
# delete strings and comments so we don't match on operands inside
|
|
for regEx in (stringRE, commentRE):
|
|
code = regEx.sub('', code)
|
|
# search for operands
|
|
next_pos = 0
|
|
while 1:
|
|
match = parser.operandsRE.search(code, next_pos)
|
|
if not match:
|
|
# no more matches: we're done
|
|
break
|
|
op = match.groups()
|
|
# regexp groups are operand full name, base, and extension
|
|
(op_full, op_base, op_ext) = op
|
|
# find this op in the master list
|
|
op_desc = master_list.find_base(op_base)
|
|
if not op_desc:
|
|
error('Found operand %s which is not in the master list!' \
|
|
' This is an internal error' % op_base)
|
|
else:
|
|
# See if we've already found this operand
|
|
op_desc = self.find_base(op_base)
|
|
if not op_desc:
|
|
# if not, add a reference to it to this sub list
|
|
self.append(master_list.bases[op_base])
|
|
|
|
# start next search after end of current match
|
|
next_pos = match.end()
|
|
self.sort()
|
|
self.memOperand = None
|
|
# Whether the whole PC needs to be read so parts of it can be accessed
|
|
self.readPC = False
|
|
# Whether the whole PC needs to be written after parts of it were
|
|
# changed
|
|
self.setPC = False
|
|
# Whether this instruction manipulates the whole PC or parts of it.
|
|
# Mixing the two is a bad idea and flagged as an error.
|
|
self.pcPart = None
|
|
|
|
# Flags to keep track if one or more operands are to be read/written
|
|
# conditionally.
|
|
self.predRead = False
|
|
self.predWrite = False
|
|
|
|
for op_desc in self.items:
|
|
if op_desc.isPCPart():
|
|
self.readPC = True
|
|
if op_desc.is_dest:
|
|
self.setPC = True
|
|
|
|
if op_desc.isPCState():
|
|
if self.pcPart is not None:
|
|
if self.pcPart and not op_desc.isPCPart() or \
|
|
not self.pcPart and op_desc.isPCPart():
|
|
error("Mixed whole and partial PC state operands.")
|
|
self.pcPart = op_desc.isPCPart()
|
|
|
|
if op_desc.isMem():
|
|
if self.memOperand:
|
|
error("Code block has more than one memory operand.")
|
|
self.memOperand = op_desc
|
|
|
|
# Check if this operand has read/write predication. If true, then
|
|
# the microop will dynamically index source/dest registers.
|
|
self.predRead = self.predRead or op_desc.hasReadPred()
|
|
self.predWrite = self.predWrite or op_desc.hasWritePred()
|
|
|
|
# Regular expression object to match C++ strings
|
|
stringRE = re.compile(r'"([^"\\]|\\.)*"')
|
|
|
|
# Regular expression object to match C++ comments
|
|
# (used in findOperands())
|
|
commentRE = re.compile(r'(^)?[^\S\n]*/(?:\*(.*?)\*/[^\S\n]*|/[^\n]*)($)?',
|
|
re.DOTALL | re.MULTILINE)
|
|
|
|
# Regular expression object to match assignment statements
|
|
# (used in findOperands())
|
|
assignRE = re.compile(r'\s*=(?!=)', re.MULTILINE)
|
|
|
|
def makeFlagConstructor(flag_list):
|
|
if len(flag_list) == 0:
|
|
return ''
|
|
# filter out repeated flags
|
|
flag_list.sort()
|
|
i = 1
|
|
while i < len(flag_list):
|
|
if flag_list[i] == flag_list[i-1]:
|
|
del flag_list[i]
|
|
else:
|
|
i += 1
|
|
pre = '\n\tflags['
|
|
post = '] = true;'
|
|
code = pre + string.join(flag_list, post + pre) + post
|
|
return code
|
|
|
|
# Assume all instruction flags are of the form 'IsFoo'
|
|
instFlagRE = re.compile(r'Is.*')
|
|
|
|
# OpClass constants end in 'Op' except No_OpClass
|
|
opClassRE = re.compile(r'.*Op|No_OpClass')
|
|
|
|
class InstObjParams(object):
|
|
def __init__(self, parser, mnem, class_name, base_class = '',
|
|
snippets = {}, opt_args = []):
|
|
self.mnemonic = mnem
|
|
self.class_name = class_name
|
|
self.base_class = base_class
|
|
if not isinstance(snippets, dict):
|
|
snippets = {'code' : snippets}
|
|
compositeCode = ' '.join(map(str, snippets.values()))
|
|
self.snippets = snippets
|
|
|
|
self.operands = OperandList(parser, compositeCode)
|
|
|
|
# The header of the constructor declares the variables to be used
|
|
# in the body of the constructor.
|
|
header = ''
|
|
header += '\n\t_numSrcRegs = 0;'
|
|
header += '\n\t_numDestRegs = 0;'
|
|
header += '\n\t_numFPDestRegs = 0;'
|
|
header += '\n\t_numIntDestRegs = 0;'
|
|
|
|
self.constructor = header + \
|
|
self.operands.concatAttrStrings('constructor')
|
|
|
|
self.flags = self.operands.concatAttrLists('flags')
|
|
|
|
# Make a basic guess on the operand class (function unit type).
|
|
# These are good enough for most cases, and can be overridden
|
|
# later otherwise.
|
|
if 'IsStore' in self.flags:
|
|
self.op_class = 'MemWriteOp'
|
|
elif 'IsLoad' in self.flags or 'IsPrefetch' in self.flags:
|
|
self.op_class = 'MemReadOp'
|
|
elif 'IsFloating' in self.flags:
|
|
self.op_class = 'FloatAddOp'
|
|
else:
|
|
self.op_class = 'IntAluOp'
|
|
|
|
# Optional arguments are assumed to be either StaticInst flags
|
|
# or an OpClass value. To avoid having to import a complete
|
|
# list of these values to match against, we do it ad-hoc
|
|
# with regexps.
|
|
for oa in opt_args:
|
|
if instFlagRE.match(oa):
|
|
self.flags.append(oa)
|
|
elif opClassRE.match(oa):
|
|
self.op_class = oa
|
|
else:
|
|
error('InstObjParams: optional arg "%s" not recognized '
|
|
'as StaticInst::Flag or OpClass.' % oa)
|
|
|
|
# add flag initialization to contructor here to include
|
|
# any flags added via opt_args
|
|
self.constructor += makeFlagConstructor(self.flags)
|
|
|
|
# if 'IsFloating' is set, add call to the FP enable check
|
|
# function (which should be provided by isa_desc via a declare)
|
|
if 'IsFloating' in self.flags:
|
|
self.fp_enable_check = 'fault = checkFpEnableFault(xc);'
|
|
else:
|
|
self.fp_enable_check = ''
|
|
|
|
##############
|
|
# Stack: a simple stack object. Used for both formats (formatStack)
|
|
# and default cases (defaultStack). Simply wraps a list to give more
|
|
# stack-like syntax and enable initialization with an argument list
|
|
# (as opposed to an argument that's a list).
|
|
|
|
class Stack(list):
|
|
def __init__(self, *items):
|
|
list.__init__(self, items)
|
|
|
|
def push(self, item):
|
|
self.append(item);
|
|
|
|
def top(self):
|
|
return self[-1]
|
|
|
|
#######################
|
|
#
|
|
# Output file template
|
|
#
|
|
|
|
file_template = '''
|
|
/*
|
|
* DO NOT EDIT THIS FILE!!!
|
|
*
|
|
* It was automatically generated from the ISA description in %(filename)s
|
|
*/
|
|
|
|
%(includes)s
|
|
|
|
%(global_output)s
|
|
|
|
namespace %(namespace)s {
|
|
|
|
%(namespace_output)s
|
|
|
|
} // namespace %(namespace)s
|
|
|
|
%(decode_function)s
|
|
'''
|
|
|
|
max_inst_regs_template = '''
|
|
/*
|
|
* DO NOT EDIT THIS FILE!!!
|
|
*
|
|
* It was automatically generated from the ISA description in %(filename)s
|
|
*/
|
|
|
|
namespace %(namespace)s {
|
|
|
|
const int MaxInstSrcRegs = %(MaxInstSrcRegs)d;
|
|
const int MaxInstDestRegs = %(MaxInstDestRegs)d;
|
|
const int MaxMiscDestRegs = %(MaxMiscDestRegs)d;
|
|
|
|
} // namespace %(namespace)s
|
|
|
|
'''
|
|
|
|
class ISAParser(Grammar):
|
|
def __init__(self, output_dir, cpu_models):
|
|
super(ISAParser, self).__init__()
|
|
self.output_dir = output_dir
|
|
|
|
self.cpuModels = cpu_models
|
|
|
|
# variable to hold templates
|
|
self.templateMap = {}
|
|
|
|
# This dictionary maps format name strings to Format objects.
|
|
self.formatMap = {}
|
|
|
|
# The format stack.
|
|
self.formatStack = Stack(NoFormat())
|
|
|
|
# The default case stack.
|
|
self.defaultStack = Stack(None)
|
|
|
|
# Stack that tracks current file and line number. Each
|
|
# element is a tuple (filename, lineno) that records the
|
|
# *current* filename and the line number in the *previous*
|
|
# file where it was included.
|
|
self.fileNameStack = Stack()
|
|
|
|
symbols = ('makeList', 're', 'string')
|
|
self.exportContext = dict([(s, eval(s)) for s in symbols])
|
|
|
|
self.maxInstSrcRegs = 0
|
|
self.maxInstDestRegs = 0
|
|
self.maxMiscDestRegs = 0
|
|
|
|
#####################################################################
|
|
#
|
|
# Lexer
|
|
#
|
|
# The PLY lexer module takes two things as input:
|
|
# - A list of token names (the string list 'tokens')
|
|
# - A regular expression describing a match for each token. The
|
|
# regexp for token FOO can be provided in two ways:
|
|
# - as a string variable named t_FOO
|
|
# - as the doc string for a function named t_FOO. In this case,
|
|
# the function is also executed, allowing an action to be
|
|
# associated with each token match.
|
|
#
|
|
#####################################################################
|
|
|
|
# Reserved words. These are listed separately as they are matched
|
|
# using the same regexp as generic IDs, but distinguished in the
|
|
# t_ID() function. The PLY documentation suggests this approach.
|
|
reserved = (
|
|
'BITFIELD', 'DECODE', 'DECODER', 'DEFAULT', 'DEF', 'EXEC', 'FORMAT',
|
|
'HEADER', 'LET', 'NAMESPACE', 'OPERAND_TYPES', 'OPERANDS',
|
|
'OUTPUT', 'SIGNED', 'TEMPLATE'
|
|
)
|
|
|
|
# List of tokens. The lex module requires this.
|
|
tokens = reserved + (
|
|
# identifier
|
|
'ID',
|
|
|
|
# integer literal
|
|
'INTLIT',
|
|
|
|
# string literal
|
|
'STRLIT',
|
|
|
|
# code literal
|
|
'CODELIT',
|
|
|
|
# ( ) [ ] { } < > , ; . : :: *
|
|
'LPAREN', 'RPAREN',
|
|
'LBRACKET', 'RBRACKET',
|
|
'LBRACE', 'RBRACE',
|
|
'LESS', 'GREATER', 'EQUALS',
|
|
'COMMA', 'SEMI', 'DOT', 'COLON', 'DBLCOLON',
|
|
'ASTERISK',
|
|
|
|
# C preprocessor directives
|
|
'CPPDIRECTIVE'
|
|
|
|
# The following are matched but never returned. commented out to
|
|
# suppress PLY warning
|
|
# newfile directive
|
|
# 'NEWFILE',
|
|
|
|
# endfile directive
|
|
# 'ENDFILE'
|
|
)
|
|
|
|
# Regular expressions for token matching
|
|
t_LPAREN = r'\('
|
|
t_RPAREN = r'\)'
|
|
t_LBRACKET = r'\['
|
|
t_RBRACKET = r'\]'
|
|
t_LBRACE = r'\{'
|
|
t_RBRACE = r'\}'
|
|
t_LESS = r'\<'
|
|
t_GREATER = r'\>'
|
|
t_EQUALS = r'='
|
|
t_COMMA = r','
|
|
t_SEMI = r';'
|
|
t_DOT = r'\.'
|
|
t_COLON = r':'
|
|
t_DBLCOLON = r'::'
|
|
t_ASTERISK = r'\*'
|
|
|
|
# Identifiers and reserved words
|
|
reserved_map = { }
|
|
for r in reserved:
|
|
reserved_map[r.lower()] = r
|
|
|
|
def t_ID(self, t):
|
|
r'[A-Za-z_]\w*'
|
|
t.type = self.reserved_map.get(t.value, 'ID')
|
|
return t
|
|
|
|
# Integer literal
|
|
def t_INTLIT(self, t):
|
|
r'-?(0x[\da-fA-F]+)|\d+'
|
|
try:
|
|
t.value = int(t.value,0)
|
|
except ValueError:
|
|
error(t, 'Integer value "%s" too large' % t.value)
|
|
t.value = 0
|
|
return t
|
|
|
|
# String literal. Note that these use only single quotes, and
|
|
# can span multiple lines.
|
|
def t_STRLIT(self, t):
|
|
r"(?m)'([^'])+'"
|
|
# strip off quotes
|
|
t.value = t.value[1:-1]
|
|
t.lexer.lineno += t.value.count('\n')
|
|
return t
|
|
|
|
|
|
# "Code literal"... like a string literal, but delimiters are
|
|
# '{{' and '}}' so they get formatted nicely under emacs c-mode
|
|
def t_CODELIT(self, t):
|
|
r"(?m)\{\{([^\}]|}(?!\}))+\}\}"
|
|
# strip off {{ & }}
|
|
t.value = t.value[2:-2]
|
|
t.lexer.lineno += t.value.count('\n')
|
|
return t
|
|
|
|
def t_CPPDIRECTIVE(self, t):
|
|
r'^\#[^\#].*\n'
|
|
t.lexer.lineno += t.value.count('\n')
|
|
return t
|
|
|
|
def t_NEWFILE(self, t):
|
|
r'^\#\#newfile\s+"[^"]*"'
|
|
self.fileNameStack.push((t.value[11:-1], t.lexer.lineno))
|
|
t.lexer.lineno = 0
|
|
|
|
def t_ENDFILE(self, t):
|
|
r'^\#\#endfile'
|
|
(old_filename, t.lexer.lineno) = self.fileNameStack.pop()
|
|
|
|
#
|
|
# The functions t_NEWLINE, t_ignore, and t_error are
|
|
# special for the lex module.
|
|
#
|
|
|
|
# Newlines
|
|
def t_NEWLINE(self, t):
|
|
r'\n+'
|
|
t.lexer.lineno += t.value.count('\n')
|
|
|
|
# Comments
|
|
def t_comment(self, t):
|
|
r'//.*'
|
|
|
|
# Completely ignored characters
|
|
t_ignore = ' \t\x0c'
|
|
|
|
# Error handler
|
|
def t_error(self, t):
|
|
error(t, "illegal character '%s'" % t.value[0])
|
|
t.skip(1)
|
|
|
|
#####################################################################
|
|
#
|
|
# Parser
|
|
#
|
|
# Every function whose name starts with 'p_' defines a grammar
|
|
# rule. The rule is encoded in the function's doc string, while
|
|
# the function body provides the action taken when the rule is
|
|
# matched. The argument to each function is a list of the values
|
|
# of the rule's symbols: t[0] for the LHS, and t[1..n] for the
|
|
# symbols on the RHS. For tokens, the value is copied from the
|
|
# t.value attribute provided by the lexer. For non-terminals, the
|
|
# value is assigned by the producing rule; i.e., the job of the
|
|
# grammar rule function is to set the value for the non-terminal
|
|
# on the LHS (by assigning to t[0]).
|
|
#####################################################################
|
|
|
|
# The LHS of the first grammar rule is used as the start symbol
|
|
# (in this case, 'specification'). Note that this rule enforces
|
|
# that there will be exactly one namespace declaration, with 0 or
|
|
# more global defs/decls before and after it. The defs & decls
|
|
# before the namespace decl will be outside the namespace; those
|
|
# after will be inside. The decoder function is always inside the
|
|
# namespace.
|
|
def p_specification(self, t):
|
|
'specification : opt_defs_and_outputs name_decl opt_defs_and_outputs decode_block'
|
|
global_code = t[1]
|
|
isa_name = t[2]
|
|
namespace = isa_name + "Inst"
|
|
# wrap the decode block as a function definition
|
|
t[4].wrap_decode_block('''
|
|
StaticInstPtr
|
|
%(isa_name)s::Decoder::decodeInst(%(isa_name)s::ExtMachInst machInst)
|
|
{
|
|
using namespace %(namespace)s;
|
|
''' % vars(), '}')
|
|
# both the latter output blocks and the decode block are in
|
|
# the namespace
|
|
namespace_code = t[3] + t[4]
|
|
# pass it all back to the caller of yacc.parse()
|
|
t[0] = (isa_name, namespace, global_code, namespace_code)
|
|
|
|
# ISA name declaration looks like "namespace <foo>;"
|
|
def p_name_decl(self, t):
|
|
'name_decl : NAMESPACE ID SEMI'
|
|
t[0] = t[2]
|
|
|
|
# 'opt_defs_and_outputs' is a possibly empty sequence of
|
|
# def and/or output statements.
|
|
def p_opt_defs_and_outputs_0(self, t):
|
|
'opt_defs_and_outputs : empty'
|
|
t[0] = GenCode(self)
|
|
|
|
def p_opt_defs_and_outputs_1(self, t):
|
|
'opt_defs_and_outputs : defs_and_outputs'
|
|
t[0] = t[1]
|
|
|
|
def p_defs_and_outputs_0(self, t):
|
|
'defs_and_outputs : def_or_output'
|
|
t[0] = t[1]
|
|
|
|
def p_defs_and_outputs_1(self, t):
|
|
'defs_and_outputs : defs_and_outputs def_or_output'
|
|
t[0] = t[1] + t[2]
|
|
|
|
# The list of possible definition/output statements.
|
|
def p_def_or_output(self, t):
|
|
'''def_or_output : def_format
|
|
| def_bitfield
|
|
| def_bitfield_struct
|
|
| def_template
|
|
| def_operand_types
|
|
| def_operands
|
|
| output_header
|
|
| output_decoder
|
|
| output_exec
|
|
| global_let'''
|
|
t[0] = t[1]
|
|
|
|
# Output blocks 'output <foo> {{...}}' (C++ code blocks) are copied
|
|
# directly to the appropriate output section.
|
|
|
|
# Massage output block by substituting in template definitions and
|
|
# bit operators. We handle '%'s embedded in the string that don't
|
|
# indicate template substitutions (or CPU-specific symbols, which
|
|
# get handled in GenCode) by doubling them first so that the
|
|
# format operation will reduce them back to single '%'s.
|
|
def process_output(self, s):
|
|
s = self.protectNonSubstPercents(s)
|
|
# protects cpu-specific symbols too
|
|
s = self.protectCpuSymbols(s)
|
|
return substBitOps(s % self.templateMap)
|
|
|
|
def p_output_header(self, t):
|
|
'output_header : OUTPUT HEADER CODELIT SEMI'
|
|
t[0] = GenCode(self, header_output = self.process_output(t[3]))
|
|
|
|
def p_output_decoder(self, t):
|
|
'output_decoder : OUTPUT DECODER CODELIT SEMI'
|
|
t[0] = GenCode(self, decoder_output = self.process_output(t[3]))
|
|
|
|
def p_output_exec(self, t):
|
|
'output_exec : OUTPUT EXEC CODELIT SEMI'
|
|
t[0] = GenCode(self, exec_output = self.process_output(t[3]))
|
|
|
|
# global let blocks 'let {{...}}' (Python code blocks) are
|
|
# executed directly when seen. Note that these execute in a
|
|
# special variable context 'exportContext' to prevent the code
|
|
# from polluting this script's namespace.
|
|
def p_global_let(self, t):
|
|
'global_let : LET CODELIT SEMI'
|
|
self.updateExportContext()
|
|
self.exportContext["header_output"] = ''
|
|
self.exportContext["decoder_output"] = ''
|
|
self.exportContext["exec_output"] = ''
|
|
self.exportContext["decode_block"] = ''
|
|
try:
|
|
exec fixPythonIndentation(t[2]) in self.exportContext
|
|
except Exception, exc:
|
|
if debug:
|
|
raise
|
|
error(t, 'error: %s in global let block "%s".' % (exc, t[2]))
|
|
t[0] = GenCode(self,
|
|
header_output=self.exportContext["header_output"],
|
|
decoder_output=self.exportContext["decoder_output"],
|
|
exec_output=self.exportContext["exec_output"],
|
|
decode_block=self.exportContext["decode_block"])
|
|
|
|
# Define the mapping from operand type extensions to C++ types and
|
|
# bit widths (stored in operandTypeMap).
|
|
def p_def_operand_types(self, t):
|
|
'def_operand_types : DEF OPERAND_TYPES CODELIT SEMI'
|
|
try:
|
|
self.operandTypeMap = eval('{' + t[3] + '}')
|
|
except Exception, exc:
|
|
if debug:
|
|
raise
|
|
error(t,
|
|
'error: %s in def operand_types block "%s".' % (exc, t[3]))
|
|
t[0] = GenCode(self) # contributes nothing to the output C++ file
|
|
|
|
# Define the mapping from operand names to operand classes and
|
|
# other traits. Stored in operandNameMap.
|
|
def p_def_operands(self, t):
|
|
'def_operands : DEF OPERANDS CODELIT SEMI'
|
|
if not hasattr(self, 'operandTypeMap'):
|
|
error(t, 'error: operand types must be defined before operands')
|
|
try:
|
|
user_dict = eval('{' + t[3] + '}', self.exportContext)
|
|
except Exception, exc:
|
|
if debug:
|
|
raise
|
|
error(t, 'error: %s in def operands block "%s".' % (exc, t[3]))
|
|
self.buildOperandNameMap(user_dict, t.lexer.lineno)
|
|
t[0] = GenCode(self) # contributes nothing to the output C++ file
|
|
|
|
# A bitfield definition looks like:
|
|
# 'def [signed] bitfield <ID> [<first>:<last>]'
|
|
# This generates a preprocessor macro in the output file.
|
|
def p_def_bitfield_0(self, t):
|
|
'def_bitfield : DEF opt_signed BITFIELD ID LESS INTLIT COLON INTLIT GREATER SEMI'
|
|
expr = 'bits(machInst, %2d, %2d)' % (t[6], t[8])
|
|
if (t[2] == 'signed'):
|
|
expr = 'sext<%d>(%s)' % (t[6] - t[8] + 1, expr)
|
|
hash_define = '#undef %s\n#define %s\t%s\n' % (t[4], t[4], expr)
|
|
t[0] = GenCode(self, header_output=hash_define)
|
|
|
|
# alternate form for single bit: 'def [signed] bitfield <ID> [<bit>]'
|
|
def p_def_bitfield_1(self, t):
|
|
'def_bitfield : DEF opt_signed BITFIELD ID LESS INTLIT GREATER SEMI'
|
|
expr = 'bits(machInst, %2d, %2d)' % (t[6], t[6])
|
|
if (t[2] == 'signed'):
|
|
expr = 'sext<%d>(%s)' % (1, expr)
|
|
hash_define = '#undef %s\n#define %s\t%s\n' % (t[4], t[4], expr)
|
|
t[0] = GenCode(self, header_output=hash_define)
|
|
|
|
# alternate form for structure member: 'def bitfield <ID> <ID>'
|
|
def p_def_bitfield_struct(self, t):
|
|
'def_bitfield_struct : DEF opt_signed BITFIELD ID id_with_dot SEMI'
|
|
if (t[2] != ''):
|
|
error(t, 'error: structure bitfields are always unsigned.')
|
|
expr = 'machInst.%s' % t[5]
|
|
hash_define = '#undef %s\n#define %s\t%s\n' % (t[4], t[4], expr)
|
|
t[0] = GenCode(self, header_output=hash_define)
|
|
|
|
def p_id_with_dot_0(self, t):
|
|
'id_with_dot : ID'
|
|
t[0] = t[1]
|
|
|
|
def p_id_with_dot_1(self, t):
|
|
'id_with_dot : ID DOT id_with_dot'
|
|
t[0] = t[1] + t[2] + t[3]
|
|
|
|
def p_opt_signed_0(self, t):
|
|
'opt_signed : SIGNED'
|
|
t[0] = t[1]
|
|
|
|
def p_opt_signed_1(self, t):
|
|
'opt_signed : empty'
|
|
t[0] = ''
|
|
|
|
def p_def_template(self, t):
|
|
'def_template : DEF TEMPLATE ID CODELIT SEMI'
|
|
self.templateMap[t[3]] = Template(self, t[4])
|
|
t[0] = GenCode(self)
|
|
|
|
# An instruction format definition looks like
|
|
# "def format <fmt>(<params>) {{...}};"
|
|
def p_def_format(self, t):
|
|
'def_format : DEF FORMAT ID LPAREN param_list RPAREN CODELIT SEMI'
|
|
(id, params, code) = (t[3], t[5], t[7])
|
|
self.defFormat(id, params, code, t.lexer.lineno)
|
|
t[0] = GenCode(self)
|
|
|
|
# The formal parameter list for an instruction format is a
|
|
# possibly empty list of comma-separated parameters. Positional
|
|
# (standard, non-keyword) parameters must come first, followed by
|
|
# keyword parameters, followed by a '*foo' parameter that gets
|
|
# excess positional arguments (as in Python). Each of these three
|
|
# parameter categories is optional.
|
|
#
|
|
# Note that we do not support the '**foo' parameter for collecting
|
|
# otherwise undefined keyword args. Otherwise the parameter list
|
|
# is (I believe) identical to what is supported in Python.
|
|
#
|
|
# The param list generates a tuple, where the first element is a
|
|
# list of the positional params and the second element is a dict
|
|
# containing the keyword params.
|
|
def p_param_list_0(self, t):
|
|
'param_list : positional_param_list COMMA nonpositional_param_list'
|
|
t[0] = t[1] + t[3]
|
|
|
|
def p_param_list_1(self, t):
|
|
'''param_list : positional_param_list
|
|
| nonpositional_param_list'''
|
|
t[0] = t[1]
|
|
|
|
def p_positional_param_list_0(self, t):
|
|
'positional_param_list : empty'
|
|
t[0] = []
|
|
|
|
def p_positional_param_list_1(self, t):
|
|
'positional_param_list : ID'
|
|
t[0] = [t[1]]
|
|
|
|
def p_positional_param_list_2(self, t):
|
|
'positional_param_list : positional_param_list COMMA ID'
|
|
t[0] = t[1] + [t[3]]
|
|
|
|
def p_nonpositional_param_list_0(self, t):
|
|
'nonpositional_param_list : keyword_param_list COMMA excess_args_param'
|
|
t[0] = t[1] + t[3]
|
|
|
|
def p_nonpositional_param_list_1(self, t):
|
|
'''nonpositional_param_list : keyword_param_list
|
|
| excess_args_param'''
|
|
t[0] = t[1]
|
|
|
|
def p_keyword_param_list_0(self, t):
|
|
'keyword_param_list : keyword_param'
|
|
t[0] = [t[1]]
|
|
|
|
def p_keyword_param_list_1(self, t):
|
|
'keyword_param_list : keyword_param_list COMMA keyword_param'
|
|
t[0] = t[1] + [t[3]]
|
|
|
|
def p_keyword_param(self, t):
|
|
'keyword_param : ID EQUALS expr'
|
|
t[0] = t[1] + ' = ' + t[3].__repr__()
|
|
|
|
def p_excess_args_param(self, t):
|
|
'excess_args_param : ASTERISK ID'
|
|
# Just concatenate them: '*ID'. Wrap in list to be consistent
|
|
# with positional_param_list and keyword_param_list.
|
|
t[0] = [t[1] + t[2]]
|
|
|
|
# End of format definition-related rules.
|
|
##############
|
|
|
|
#
|
|
# A decode block looks like:
|
|
# decode <field1> [, <field2>]* [default <inst>] { ... }
|
|
#
|
|
def p_decode_block(self, t):
|
|
'decode_block : DECODE ID opt_default LBRACE decode_stmt_list RBRACE'
|
|
default_defaults = self.defaultStack.pop()
|
|
codeObj = t[5]
|
|
# use the "default defaults" only if there was no explicit
|
|
# default statement in decode_stmt_list
|
|
if not codeObj.has_decode_default:
|
|
codeObj += default_defaults
|
|
codeObj.wrap_decode_block('switch (%s) {\n' % t[2], '}\n')
|
|
t[0] = codeObj
|
|
|
|
# The opt_default statement serves only to push the "default
|
|
# defaults" onto defaultStack. This value will be used by nested
|
|
# decode blocks, and used and popped off when the current
|
|
# decode_block is processed (in p_decode_block() above).
|
|
def p_opt_default_0(self, t):
|
|
'opt_default : empty'
|
|
# no default specified: reuse the one currently at the top of
|
|
# the stack
|
|
self.defaultStack.push(self.defaultStack.top())
|
|
# no meaningful value returned
|
|
t[0] = None
|
|
|
|
def p_opt_default_1(self, t):
|
|
'opt_default : DEFAULT inst'
|
|
# push the new default
|
|
codeObj = t[2]
|
|
codeObj.wrap_decode_block('\ndefault:\n', 'break;\n')
|
|
self.defaultStack.push(codeObj)
|
|
# no meaningful value returned
|
|
t[0] = None
|
|
|
|
def p_decode_stmt_list_0(self, t):
|
|
'decode_stmt_list : decode_stmt'
|
|
t[0] = t[1]
|
|
|
|
def p_decode_stmt_list_1(self, t):
|
|
'decode_stmt_list : decode_stmt decode_stmt_list'
|
|
if (t[1].has_decode_default and t[2].has_decode_default):
|
|
error(t, 'Two default cases in decode block')
|
|
t[0] = t[1] + t[2]
|
|
|
|
#
|
|
# Decode statement rules
|
|
#
|
|
# There are four types of statements allowed in a decode block:
|
|
# 1. Format blocks 'format <foo> { ... }'
|
|
# 2. Nested decode blocks
|
|
# 3. Instruction definitions.
|
|
# 4. C preprocessor directives.
|
|
|
|
|
|
# Preprocessor directives found in a decode statement list are
|
|
# passed through to the output, replicated to all of the output
|
|
# code streams. This works well for ifdefs, so we can ifdef out
|
|
# both the declarations and the decode cases generated by an
|
|
# instruction definition. Handling them as part of the grammar
|
|
# makes it easy to keep them in the right place with respect to
|
|
# the code generated by the other statements.
|
|
def p_decode_stmt_cpp(self, t):
|
|
'decode_stmt : CPPDIRECTIVE'
|
|
t[0] = GenCode(self, t[1], t[1], t[1], t[1])
|
|
|
|
# A format block 'format <foo> { ... }' sets the default
|
|
# instruction format used to handle instruction definitions inside
|
|
# the block. This format can be overridden by using an explicit
|
|
# format on the instruction definition or with a nested format
|
|
# block.
|
|
def p_decode_stmt_format(self, t):
|
|
'decode_stmt : FORMAT push_format_id LBRACE decode_stmt_list RBRACE'
|
|
# The format will be pushed on the stack when 'push_format_id'
|
|
# is processed (see below). Once the parser has recognized
|
|
# the full production (though the right brace), we're done
|
|
# with the format, so now we can pop it.
|
|
self.formatStack.pop()
|
|
t[0] = t[4]
|
|
|
|
# This rule exists so we can set the current format (& push the
|
|
# stack) when we recognize the format name part of the format
|
|
# block.
|
|
def p_push_format_id(self, t):
|
|
'push_format_id : ID'
|
|
try:
|
|
self.formatStack.push(self.formatMap[t[1]])
|
|
t[0] = ('', '// format %s' % t[1])
|
|
except KeyError:
|
|
error(t, 'instruction format "%s" not defined.' % t[1])
|
|
|
|
# Nested decode block: if the value of the current field matches
|
|
# the specified constant, do a nested decode on some other field.
|
|
def p_decode_stmt_decode(self, t):
|
|
'decode_stmt : case_label COLON decode_block'
|
|
label = t[1]
|
|
codeObj = t[3]
|
|
# just wrap the decoding code from the block as a case in the
|
|
# outer switch statement.
|
|
codeObj.wrap_decode_block('\n%s:\n' % label)
|
|
codeObj.has_decode_default = (label == 'default')
|
|
t[0] = codeObj
|
|
|
|
# Instruction definition (finally!).
|
|
def p_decode_stmt_inst(self, t):
|
|
'decode_stmt : case_label COLON inst SEMI'
|
|
label = t[1]
|
|
codeObj = t[3]
|
|
codeObj.wrap_decode_block('\n%s:' % label, 'break;\n')
|
|
codeObj.has_decode_default = (label == 'default')
|
|
t[0] = codeObj
|
|
|
|
# The case label is either a list of one or more constants or
|
|
# 'default'
|
|
def p_case_label_0(self, t):
|
|
'case_label : intlit_list'
|
|
def make_case(intlit):
|
|
if intlit >= 2**32:
|
|
return 'case ULL(%#x)' % intlit
|
|
else:
|
|
return 'case %#x' % intlit
|
|
t[0] = ': '.join(map(make_case, t[1]))
|
|
|
|
def p_case_label_1(self, t):
|
|
'case_label : DEFAULT'
|
|
t[0] = 'default'
|
|
|
|
#
|
|
# The constant list for a decode case label must be non-empty, but
|
|
# may have one or more comma-separated integer literals in it.
|
|
#
|
|
def p_intlit_list_0(self, t):
|
|
'intlit_list : INTLIT'
|
|
t[0] = [t[1]]
|
|
|
|
def p_intlit_list_1(self, t):
|
|
'intlit_list : intlit_list COMMA INTLIT'
|
|
t[0] = t[1]
|
|
t[0].append(t[3])
|
|
|
|
# Define an instruction using the current instruction format
|
|
# (specified by an enclosing format block).
|
|
# "<mnemonic>(<args>)"
|
|
def p_inst_0(self, t):
|
|
'inst : ID LPAREN arg_list RPAREN'
|
|
# Pass the ID and arg list to the current format class to deal with.
|
|
currentFormat = self.formatStack.top()
|
|
codeObj = currentFormat.defineInst(self, t[1], t[3], t.lexer.lineno)
|
|
args = ','.join(map(str, t[3]))
|
|
args = re.sub('(?m)^', '//', args)
|
|
args = re.sub('^//', '', args)
|
|
comment = '\n// %s::%s(%s)\n' % (currentFormat.id, t[1], args)
|
|
codeObj.prepend_all(comment)
|
|
t[0] = codeObj
|
|
|
|
# Define an instruction using an explicitly specified format:
|
|
# "<fmt>::<mnemonic>(<args>)"
|
|
def p_inst_1(self, t):
|
|
'inst : ID DBLCOLON ID LPAREN arg_list RPAREN'
|
|
try:
|
|
format = self.formatMap[t[1]]
|
|
except KeyError:
|
|
error(t, 'instruction format "%s" not defined.' % t[1])
|
|
|
|
codeObj = format.defineInst(self, t[3], t[5], t.lexer.lineno)
|
|
comment = '\n// %s::%s(%s)\n' % (t[1], t[3], t[5])
|
|
codeObj.prepend_all(comment)
|
|
t[0] = codeObj
|
|
|
|
# The arg list generates a tuple, where the first element is a
|
|
# list of the positional args and the second element is a dict
|
|
# containing the keyword args.
|
|
def p_arg_list_0(self, t):
|
|
'arg_list : positional_arg_list COMMA keyword_arg_list'
|
|
t[0] = ( t[1], t[3] )
|
|
|
|
def p_arg_list_1(self, t):
|
|
'arg_list : positional_arg_list'
|
|
t[0] = ( t[1], {} )
|
|
|
|
def p_arg_list_2(self, t):
|
|
'arg_list : keyword_arg_list'
|
|
t[0] = ( [], t[1] )
|
|
|
|
def p_positional_arg_list_0(self, t):
|
|
'positional_arg_list : empty'
|
|
t[0] = []
|
|
|
|
def p_positional_arg_list_1(self, t):
|
|
'positional_arg_list : expr'
|
|
t[0] = [t[1]]
|
|
|
|
def p_positional_arg_list_2(self, t):
|
|
'positional_arg_list : positional_arg_list COMMA expr'
|
|
t[0] = t[1] + [t[3]]
|
|
|
|
def p_keyword_arg_list_0(self, t):
|
|
'keyword_arg_list : keyword_arg'
|
|
t[0] = t[1]
|
|
|
|
def p_keyword_arg_list_1(self, t):
|
|
'keyword_arg_list : keyword_arg_list COMMA keyword_arg'
|
|
t[0] = t[1]
|
|
t[0].update(t[3])
|
|
|
|
def p_keyword_arg(self, t):
|
|
'keyword_arg : ID EQUALS expr'
|
|
t[0] = { t[1] : t[3] }
|
|
|
|
#
|
|
# Basic expressions. These constitute the argument values of
|
|
# "function calls" (i.e. instruction definitions in the decode
|
|
# block) and default values for formal parameters of format
|
|
# functions.
|
|
#
|
|
# Right now, these are either strings, integers, or (recursively)
|
|
# lists of exprs (using Python square-bracket list syntax). Note
|
|
# that bare identifiers are trated as string constants here (since
|
|
# there isn't really a variable namespace to refer to).
|
|
#
|
|
def p_expr_0(self, t):
|
|
'''expr : ID
|
|
| INTLIT
|
|
| STRLIT
|
|
| CODELIT'''
|
|
t[0] = t[1]
|
|
|
|
def p_expr_1(self, t):
|
|
'''expr : LBRACKET list_expr RBRACKET'''
|
|
t[0] = t[2]
|
|
|
|
def p_list_expr_0(self, t):
|
|
'list_expr : expr'
|
|
t[0] = [t[1]]
|
|
|
|
def p_list_expr_1(self, t):
|
|
'list_expr : list_expr COMMA expr'
|
|
t[0] = t[1] + [t[3]]
|
|
|
|
def p_list_expr_2(self, t):
|
|
'list_expr : empty'
|
|
t[0] = []
|
|
|
|
#
|
|
# Empty production... use in other rules for readability.
|
|
#
|
|
def p_empty(self, t):
|
|
'empty :'
|
|
pass
|
|
|
|
# Parse error handler. Note that the argument here is the
|
|
# offending *token*, not a grammar symbol (hence the need to use
|
|
# t.value)
|
|
def p_error(self, t):
|
|
if t:
|
|
error(t, "syntax error at '%s'" % t.value)
|
|
else:
|
|
error("unknown syntax error")
|
|
|
|
# END OF GRAMMAR RULES
|
|
|
|
def updateExportContext(self):
|
|
|
|
# create a continuation that allows us to grab the current parser
|
|
def wrapInstObjParams(*args):
|
|
return InstObjParams(self, *args)
|
|
self.exportContext['InstObjParams'] = wrapInstObjParams
|
|
self.exportContext.update(self.templateMap)
|
|
|
|
def defFormat(self, id, params, code, lineno):
|
|
'''Define a new format'''
|
|
|
|
# make sure we haven't already defined this one
|
|
if id in self.formatMap:
|
|
error(lineno, 'format %s redefined.' % id)
|
|
|
|
# create new object and store in global map
|
|
self.formatMap[id] = Format(id, params, code)
|
|
|
|
def expandCpuSymbolsToDict(self, template):
|
|
'''Expand template with CPU-specific references into a
|
|
dictionary with an entry for each CPU model name. The entry
|
|
key is the model name and the corresponding value is the
|
|
template with the CPU-specific refs substituted for that
|
|
model.'''
|
|
|
|
# Protect '%'s that don't go with CPU-specific terms
|
|
t = re.sub(r'%(?!\(CPU_)', '%%', template)
|
|
result = {}
|
|
for cpu in self.cpuModels:
|
|
result[cpu.name] = t % cpu.strings
|
|
return result
|
|
|
|
def expandCpuSymbolsToString(self, template):
|
|
'''*If* the template has CPU-specific references, return a
|
|
single string containing a copy of the template for each CPU
|
|
model with the corresponding values substituted in. If the
|
|
template has no CPU-specific references, it is returned
|
|
unmodified.'''
|
|
|
|
if template.find('%(CPU_') != -1:
|
|
return reduce(lambda x,y: x+y,
|
|
self.expandCpuSymbolsToDict(template).values())
|
|
else:
|
|
return template
|
|
|
|
def protectCpuSymbols(self, template):
|
|
'''Protect CPU-specific references by doubling the
|
|
corresponding '%'s (in preparation for substituting a different
|
|
set of references into the template).'''
|
|
|
|
return re.sub(r'%(?=\(CPU_)', '%%', template)
|
|
|
|
def protectNonSubstPercents(self, s):
|
|
'''Protect any non-dict-substitution '%'s in a format string
|
|
(i.e. those not followed by '(')'''
|
|
|
|
return re.sub(r'%(?!\()', '%%', s)
|
|
|
|
def buildOperandNameMap(self, user_dict, lineno):
|
|
operand_name = {}
|
|
for op_name, val in user_dict.iteritems():
|
|
|
|
# Check if extra attributes have been specified.
|
|
if len(val) > 9:
|
|
error(lineno, 'error: too many attributes for operand "%s"' %
|
|
base_cls_name)
|
|
|
|
# Pad val with None in case optional args are missing
|
|
val += (None, None, None, None)
|
|
base_cls_name, dflt_ext, reg_spec, flags, sort_pri, \
|
|
read_code, write_code, read_predicate, write_predicate = val[:9]
|
|
|
|
# Canonical flag structure is a triple of lists, where each list
|
|
# indicates the set of flags implied by this operand always, when
|
|
# used as a source, and when used as a dest, respectively.
|
|
# For simplicity this can be initialized using a variety of fairly
|
|
# obvious shortcuts; we convert these to canonical form here.
|
|
if not flags:
|
|
# no flags specified (e.g., 'None')
|
|
flags = ( [], [], [] )
|
|
elif isinstance(flags, str):
|
|
# a single flag: assumed to be unconditional
|
|
flags = ( [ flags ], [], [] )
|
|
elif isinstance(flags, list):
|
|
# a list of flags: also assumed to be unconditional
|
|
flags = ( flags, [], [] )
|
|
elif isinstance(flags, tuple):
|
|
# it's a tuple: it should be a triple,
|
|
# but each item could be a single string or a list
|
|
(uncond_flags, src_flags, dest_flags) = flags
|
|
flags = (makeList(uncond_flags),
|
|
makeList(src_flags), makeList(dest_flags))
|
|
|
|
# Accumulate attributes of new operand class in tmp_dict
|
|
tmp_dict = {}
|
|
attrList = ['reg_spec', 'flags', 'sort_pri',
|
|
'read_code', 'write_code',
|
|
'read_predicate', 'write_predicate']
|
|
if dflt_ext:
|
|
dflt_ctype = self.operandTypeMap[dflt_ext]
|
|
attrList.extend(['dflt_ctype', 'dflt_ext'])
|
|
for attr in attrList:
|
|
tmp_dict[attr] = eval(attr)
|
|
tmp_dict['base_name'] = op_name
|
|
|
|
# New class name will be e.g. "IntReg_Ra"
|
|
cls_name = base_cls_name + '_' + op_name
|
|
# Evaluate string arg to get class object. Note that the
|
|
# actual base class for "IntReg" is "IntRegOperand", i.e. we
|
|
# have to append "Operand".
|
|
try:
|
|
base_cls = eval(base_cls_name + 'Operand')
|
|
except NameError:
|
|
error(lineno,
|
|
'error: unknown operand base class "%s"' % base_cls_name)
|
|
# The following statement creates a new class called
|
|
# <cls_name> as a subclass of <base_cls> with the attributes
|
|
# in tmp_dict, just as if we evaluated a class declaration.
|
|
operand_name[op_name] = type(cls_name, (base_cls,), tmp_dict)
|
|
|
|
self.operandNameMap = operand_name
|
|
|
|
# Define operand variables.
|
|
operands = user_dict.keys()
|
|
extensions = self.operandTypeMap.keys()
|
|
|
|
operandsREString = r'''
|
|
(?<!\w) # neg. lookbehind assertion: prevent partial matches
|
|
((%s)(?:_(%s))?) # match: operand with optional '_' then suffix
|
|
(?!\w) # neg. lookahead assertion: prevent partial matches
|
|
''' % (string.join(operands, '|'), string.join(extensions, '|'))
|
|
|
|
self.operandsRE = re.compile(operandsREString, re.MULTILINE|re.VERBOSE)
|
|
|
|
# Same as operandsREString, but extension is mandatory, and only two
|
|
# groups are returned (base and ext, not full name as above).
|
|
# Used for subtituting '_' for '.' to make C++ identifiers.
|
|
operandsWithExtREString = r'(?<!\w)(%s)_(%s)(?!\w)' \
|
|
% (string.join(operands, '|'), string.join(extensions, '|'))
|
|
|
|
self.operandsWithExtRE = \
|
|
re.compile(operandsWithExtREString, re.MULTILINE)
|
|
|
|
def substMungedOpNames(self, code):
|
|
'''Munge operand names in code string to make legal C++
|
|
variable names. This means getting rid of the type extension
|
|
if any. Will match base_name attribute of Operand object.)'''
|
|
return self.operandsWithExtRE.sub(r'\1', code)
|
|
|
|
def mungeSnippet(self, s):
|
|
'''Fix up code snippets for final substitution in templates.'''
|
|
if isinstance(s, str):
|
|
return self.substMungedOpNames(substBitOps(s))
|
|
else:
|
|
return s
|
|
|
|
def update_if_needed(self, file, contents):
|
|
'''Update the output file only if the new contents are
|
|
different from the current contents. Minimizes the files that
|
|
need to be rebuilt after minor changes.'''
|
|
|
|
file = os.path.join(self.output_dir, file)
|
|
update = False
|
|
if os.access(file, os.R_OK):
|
|
f = open(file, 'r')
|
|
old_contents = f.read()
|
|
f.close()
|
|
if contents != old_contents:
|
|
os.remove(file) # in case it's write-protected
|
|
update = True
|
|
else:
|
|
print 'File', file, 'is unchanged'
|
|
else:
|
|
update = True
|
|
if update:
|
|
f = open(file, 'w')
|
|
f.write(contents)
|
|
f.close()
|
|
|
|
# This regular expression matches '##include' directives
|
|
includeRE = re.compile(r'^\s*##include\s+"(?P<filename>[^"]*)".*$',
|
|
re.MULTILINE)
|
|
|
|
def replace_include(self, matchobj, dirname):
|
|
"""Function to replace a matched '##include' directive with the
|
|
contents of the specified file (with nested ##includes
|
|
replaced recursively). 'matchobj' is an re match object
|
|
(from a match of includeRE) and 'dirname' is the directory
|
|
relative to which the file path should be resolved."""
|
|
|
|
fname = matchobj.group('filename')
|
|
full_fname = os.path.normpath(os.path.join(dirname, fname))
|
|
contents = '##newfile "%s"\n%s\n##endfile\n' % \
|
|
(full_fname, self.read_and_flatten(full_fname))
|
|
return contents
|
|
|
|
def read_and_flatten(self, filename):
|
|
"""Read a file and recursively flatten nested '##include' files."""
|
|
|
|
current_dir = os.path.dirname(filename)
|
|
try:
|
|
contents = open(filename).read()
|
|
except IOError:
|
|
error('Error including file "%s"' % filename)
|
|
|
|
self.fileNameStack.push((filename, 0))
|
|
|
|
# Find any includes and include them
|
|
def replace(matchobj):
|
|
return self.replace_include(matchobj, current_dir)
|
|
contents = self.includeRE.sub(replace, contents)
|
|
|
|
self.fileNameStack.pop()
|
|
return contents
|
|
|
|
def _parse_isa_desc(self, isa_desc_file):
|
|
'''Read in and parse the ISA description.'''
|
|
|
|
# Read file and (recursively) all included files into a string.
|
|
# PLY requires that the input be in a single string so we have to
|
|
# do this up front.
|
|
isa_desc = self.read_and_flatten(isa_desc_file)
|
|
|
|
# Initialize filename stack with outer file.
|
|
self.fileNameStack.push((isa_desc_file, 0))
|
|
|
|
# Parse it.
|
|
(isa_name, namespace, global_code, namespace_code) = \
|
|
self.parse_string(isa_desc)
|
|
|
|
# grab the last three path components of isa_desc_file to put in
|
|
# the output
|
|
filename = '/'.join(isa_desc_file.split('/')[-3:])
|
|
|
|
# generate decoder.hh
|
|
includes = '#include "base/bitfield.hh" // for bitfield support'
|
|
global_output = global_code.header_output
|
|
namespace_output = namespace_code.header_output
|
|
decode_function = ''
|
|
self.update_if_needed('decoder.hh', file_template % vars())
|
|
|
|
# generate decoder.cc
|
|
includes = '#include "decoder.hh"'
|
|
global_output = global_code.decoder_output
|
|
namespace_output = namespace_code.decoder_output
|
|
# namespace_output += namespace_code.decode_block
|
|
decode_function = namespace_code.decode_block
|
|
self.update_if_needed('decoder.cc', file_template % vars())
|
|
|
|
# generate per-cpu exec files
|
|
for cpu in self.cpuModels:
|
|
includes = '#include "decoder.hh"\n'
|
|
includes += cpu.includes
|
|
global_output = global_code.exec_output[cpu.name]
|
|
namespace_output = namespace_code.exec_output[cpu.name]
|
|
decode_function = ''
|
|
self.update_if_needed(cpu.filename, file_template % vars())
|
|
|
|
# The variable names here are hacky, but this will creat local
|
|
# variables which will be referenced in vars() which have the
|
|
# value of the globals.
|
|
MaxInstSrcRegs = self.maxInstSrcRegs
|
|
MaxInstDestRegs = self.maxInstDestRegs
|
|
MaxMiscDestRegs = self.maxMiscDestRegs
|
|
# max_inst_regs.hh
|
|
self.update_if_needed('max_inst_regs.hh',
|
|
max_inst_regs_template % vars())
|
|
|
|
def parse_isa_desc(self, *args, **kwargs):
|
|
try:
|
|
self._parse_isa_desc(*args, **kwargs)
|
|
except ISAParserError, e:
|
|
e.exit(self.fileNameStack)
|
|
|
|
# Called as script: get args from command line.
|
|
# Args are: <path to cpu_models.py> <isa desc file> <output dir> <cpu models>
|
|
if __name__ == '__main__':
|
|
execfile(sys.argv[1]) # read in CpuModel definitions
|
|
cpu_models = [CpuModel.dict[cpu] for cpu in sys.argv[4:]]
|
|
ISAParser(sys.argv[3], cpu_models).parse_isa_desc(sys.argv[2])
|