arch/isa_parser.py: Fix include path (bitfield.hh -> base/bitfield.hh). --HG-- extra : convert_revision : 2ce02d0a5986694a6a6ebcab1e5e0a306d6e5a49
1450 lines
49 KiB
Python
Executable file
1450 lines
49 KiB
Python
Executable file
#! /usr/bin/env python
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# $Id$
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# Copyright (c) 2003 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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import os
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import sys
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import re
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import string
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# get type names
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from types import *
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# Check arguments. Right now there are only two: the name of the ISA
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# description (input) file and the name of the C++ decoder (output) file.
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isa_desc_filename = sys.argv[1]
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decoder_filename = sys.argv[2]
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# Might as well suck the file in while we're here. This way if it's a
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# bad filename we don't waste a lot of time building the parser :-).
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input = open(isa_desc_filename)
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isa_desc = input.read()
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input.close()
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# Prepend the directory where the PLY lex & yacc modules are found
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# to the search path. Assumes we're compiling in a subdirectory
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# of 'build' in the current tree.
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sys.path[0:0] = [os.environ['M5_EXT'] + '/ply']
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import lex
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import yacc
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#####################################################################
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#
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# Lexer
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#
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# The PLY lexer module takes two things as input:
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# - A list of token names (the string list 'tokens')
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# - A regular expression describing a match for each token. The
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# regexp for token FOO can be provided in two ways:
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# - as a string variable named t_FOO
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# - as the doc string for a function named t_FOO. In this case,
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# the function is also executed, allowing an action to be
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# associated with each token match.
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#
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#####################################################################
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# Reserved words. These are listed separately as they are matched
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# using the same regexp as generic IDs, but distinguished in the
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# t_ID() function. The PLY documentation suggests this approach.
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reserved = (
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'BITFIELD', 'DECLARE', 'DECODE', 'DEFAULT', 'DEF', 'FORMAT',
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'LET', 'NAMESPACE', 'SIGNED', 'TEMPLATE'
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)
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# List of tokens. The lex module requires this.
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tokens = reserved + (
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# identifier
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'ID',
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# integer literal
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'INTLIT',
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# string literal
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'STRLIT',
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# code literal
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'CODELIT',
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# ( ) [ ] { } < > , ; : :: *
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'LPAREN', 'RPAREN',
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# not used any more... commented out to suppress PLY warning
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# 'LBRACKET', 'RBRACKET',
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'LBRACE', 'RBRACE',
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'LESS', 'GREATER',
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'COMMA', 'SEMI', 'COLON', 'DBLCOLON',
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'ASTERISK',
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# C preprocessor directives
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'CPPDIRECTIVE'
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)
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# Regular expressions for token matching
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t_LPAREN = r'\('
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t_RPAREN = r'\)'
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# not used any more... commented out to suppress PLY warning
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# t_LBRACKET = r'\['
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# t_RBRACKET = r'\]'
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t_LBRACE = r'\{'
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t_RBRACE = r'\}'
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t_LESS = r'\<'
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t_GREATER = r'\>'
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t_COMMA = r','
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t_SEMI = r';'
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t_COLON = r':'
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t_DBLCOLON = r'::'
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t_ASTERISK = r'\*'
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# Identifiers and reserved words
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reserved_map = { }
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for r in reserved:
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reserved_map[r.lower()] = r
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def t_ID(t):
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r'[A-Za-z_]\w*'
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t.type = reserved_map.get(t.value,'ID')
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return t
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# Integer literal
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def t_INTLIT(t):
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r'(0x[\da-fA-F]+)|\d+'
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try:
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t.value = int(t.value,0)
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except ValueError:
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error(t.lineno, 'Integer value "%s" too large' % t.value)
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t.value = 0
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return t
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# String literal. Note that these use only single quotes, and
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# can span multiple lines.
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def t_STRLIT(t):
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r"(?m)'([^'])+'"
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# strip off quotes
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t.value = t.value[1:-1]
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t.lineno += t.value.count('\n')
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return t
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# "Code literal"... like a string literal, but delimiters are
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# '{{' and '}}' so they get formatted nicely under emacs c-mode
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def t_CODELIT(t):
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r"(?m)\{\{([^\}]|}(?!\}))+\}\}"
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# strip off {{ & }}
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t.value = t.value[2:-2]
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t.lineno += t.value.count('\n')
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return t
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def t_CPPDIRECTIVE(t):
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r'^\#.*\n'
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t.lineno += t.value.count('\n')
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return t
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#
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# The functions t_NEWLINE, t_ignore, and t_error are
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# special for the lex module.
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#
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# Newlines
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def t_NEWLINE(t):
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r'\n+'
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t.lineno += t.value.count('\n')
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# Comments
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def t_comment(t):
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r'//.*'
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# Completely ignored characters
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t_ignore = ' \t\x0c'
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# Error handler
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def t_error(t):
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error(t.lineno, "illegal character '%s'" % t.value[0])
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t.skip(1)
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# Build the lexer
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lex.lex()
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#####################################################################
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#
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# Parser
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#
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# Every function whose name starts with 'p_' defines a grammar rule.
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# The rule is encoded in the function's doc string, while the
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# function body provides the action taken when the rule is matched.
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# The argument to each function is a list of the values of the
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# rule's symbols: t[0] for the LHS, and t[1..n] for the symbols
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# on the RHS. For tokens, the value is copied from the t.value
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# attribute provided by the lexer. For non-terminals, the value
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# is assigned by the producing rule; i.e., the job of the grammar
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# rule function is to set the value for the non-terminal on the LHS
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# (by assigning to t[0]).
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#####################################################################
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# Not sure why, but we get a handful of shift/reduce conflicts on DECLARE.
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# By default these get resolved as shifts, which is correct, but
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# warnings are printed. Explicitly marking DECLARE as right-associative
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# suppresses the warnings.
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precedence = (
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('right', 'DECLARE'),
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)
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# The LHS of the first grammar rule is used as the start symbol
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# (in this case, 'specification'). Note that this rule enforces
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# that there will be exactly one namespace declaration, with 0 or more
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# global defs/decls before and after it. The defs & decls before
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# the namespace decl will be outside the namespace; those after
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# will be inside. The decoder function is always inside the namespace.
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def p_specification(t):
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'specification : opt_defs_and_declares name_decl opt_defs_and_declares decode_block'
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global_decls1 = t[1]
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isa_name = t[2]
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namespace = isa_name + "Inst"
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global_decls2 = t[3]
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(inst_decls, code) = t[4]
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code = indent(code)
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# grab the last three path components of isa_desc_filename
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filename = '/'.join(isa_desc_filename.split('/')[-3:])
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# if the isa_desc file defines a 'rcs_id' string,
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# echo that into the output too
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try:
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local_rcs_id = rcs_id
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# strip $s out of ID so it doesn't get re-substituted
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local_rcs_id = re.sub(r'\$', '', local_rcs_id)
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except NameError:
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local_rcs_id = 'Id: no RCS id found'
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output = open(decoder_filename, 'w')
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# split string to keep rcs from substituting this file's RCS id in
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print >> output, '/* $Id' + '''$ */
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/*
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* Copyright (c) 2003
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* The Regents of The University of Michigan
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* All Rights Reserved
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*
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* This code is part of the M5 simulator, developed by Nathan Binkert,
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* Erik Hallnor, Steve Raasch, and Steve Reinhardt, with contributions
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* from Ron Dreslinski, Dave Greene, and Lisa Hsu.
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*
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* Permission is granted to use, copy, create derivative works and
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* redistribute this software and such derivative works for any
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* purpose, so long as the copyright notice above, this grant of
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* permission, and the disclaimer below appear in all copies made; and
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* so long as the name of The University of Michigan is not used in
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* any advertising or publicity pertaining to the use or distribution
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* of this software without specific, written prior authorization.
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*
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* THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION FROM THE
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* UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY PURPOSE, AND
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* WITHOUT WARRANTY BY THE UNIVERSITY OF MICHIGAN OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE. THE REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE
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* LIABLE FOR ANY DAMAGES, INCLUDING DIRECT, SPECIAL, INDIRECT,
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* INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM
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* ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
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* IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGES.
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*/
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/*
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* DO NOT EDIT THIS FILE!!!
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*
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* It was automatically generated from this ISA description:
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* Filename: %(filename)s
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* RCS %(local_rcs_id)s
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*/
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#include "base/bitfield.hh" // required for bitfield support
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/////////////////////////////////////
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// Global defs (outside namespace) //
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/////////////////////////////////////
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%(global_decls1)s
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/**
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* Namespace for %(isa_name)s static instruction objects.
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*/
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namespace %(namespace)s
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{
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/////////////////////////////////////
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// Global defs (within namespace) //
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/////////////////////////////////////
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%(global_decls2)s
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////////////////////////////////////
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// Declares from inst definitions //
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////////////////////////////////////
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%(inst_decls)s
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} // namespace %(namespace)s
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//////////////////////
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// Decoder function //
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//////////////////////
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StaticInstPtr<%(isa_name)s>
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%(isa_name)s::decodeInst(%(isa_name)s::MachInst machInst)
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{
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using namespace %(namespace)s;
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%(code)s
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} // decodeInst
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''' % vars()
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output.close()
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# ISA name declaration looks like "namespace <foo>;"
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def p_name_decl(t):
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'name_decl : NAMESPACE ID SEMI'
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t[0] = t[2]
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# 'opt_defs_and_declares' is a possibly empty sequence of
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# defs and/or declares.
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def p_opt_defs_and_declares_0(t):
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'opt_defs_and_declares : empty'
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t[0] = ''
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def p_opt_defs_and_declares_1(t):
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'opt_defs_and_declares : defs_and_declares'
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t[0] = t[1]
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def p_defs_and_declares_0(t):
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'defs_and_declares : def_or_declare'
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t[0] = t[1]
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def p_defs_and_declares_1(t):
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'defs_and_declares : defs_and_declares def_or_declare'
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t[0] = t[1] + t[2]
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# The list of possible definition/declaration statements.
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def p_def_or_declare(t):
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'''def_or_declare : def_format
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| def_bitfield
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| def_template
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| global_declare
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| global_let
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| cpp_directive'''
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t[0] = t[1]
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# preprocessor directives are copied directly to the output.
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def p_cpp_directive(t):
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'''cpp_directive : CPPDIRECTIVE'''
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t[0] = t[1]
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# Global declares 'declare {{...}}' (C++ code blocks) are copied
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# directly to the output.
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def p_global_declare(t):
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'global_declare : DECLARE CODELIT SEMI'
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t[0] = substBitOps(t[2])
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# global let blocks 'let {{...}}' (Python code blocks) are executed
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# directly when seen. These are typically used to initialize global
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# Python variables used in later format definitions.
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def p_global_let(t):
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'global_let : LET CODELIT SEMI'
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try:
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exec(fixPythonIndentation(t[2]))
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except:
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error_bt(t.lineno(1), 'error in global let block "%s".' % t[2])
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t[0] = '' # contributes nothing to the output C++ file
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# A bitfield definition looks like:
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# 'def [signed] bitfield <ID> [<first>:<last>]'
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# This generates a preprocessor macro in the output file.
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def p_def_bitfield_0(t):
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'def_bitfield : DEF opt_signed BITFIELD ID LESS INTLIT COLON INTLIT GREATER SEMI'
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expr = 'bits(machInst, %2d, %2d)' % (t[6], t[8])
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if (t[2] == 'signed'):
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expr = 'sext<%d>(%s)' % (t[6] - t[8] + 1, expr)
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t[0] = '#undef %s\n#define %s\t%s\n' % (t[4], t[4], expr)
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# alternate form for single bit: 'def [signed] bitfield <ID> [<bit>]'
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def p_def_bitfield_1(t):
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'def_bitfield : DEF opt_signed BITFIELD ID LESS INTLIT GREATER SEMI'
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expr = 'bits(machInst, %2d, %2d)' % (t[6], t[6])
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if (t[2] == 'signed'):
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expr = 'sext<%d>(%s)' % (1, expr)
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t[0] = '#undef %s\n#define %s\t%s\n' % (t[4], t[4], expr)
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def p_opt_signed_0(t):
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'opt_signed : SIGNED'
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t[0] = t[1]
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def p_opt_signed_1(t):
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'opt_signed : empty'
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t[0] = ''
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# Global map variable to hold templates
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templateMap = {}
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def p_def_template(t):
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'def_template : DEF TEMPLATE ID CODELIT SEMI'
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templateMap[t[3]] = t[4]
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t[0] = ''
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# An instruction format definition looks like
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# "def format <fmt>(<params>) {{...}};"
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def p_def_format(t):
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'def_format : DEF FORMAT ID LPAREN param_list RPAREN CODELIT SEMI'
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(id, params, code) = (t[3], t[5], t[7])
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defFormat(id, params, code, t.lineno(1))
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# insert a comment into the output to note that the def was processed
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t[0] = '''
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//
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// parser: format %s defined
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//
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''' % id
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# The formal parameter list for an instruction format is a possibly
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# empty list of comma-separated parameters.
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def p_param_list_0(t):
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'param_list : empty'
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t[0] = [ ]
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def p_param_list_1(t):
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'param_list : param'
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t[0] = [t[1]]
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def p_param_list_2(t):
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'param_list : param_list COMMA param'
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t[0] = t[1]
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t[0].append(t[3])
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# Each formal parameter is either an identifier or an identifier
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# preceded by an asterisk. As in Python, the latter (if present) gets
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# a tuple containing all the excess positional arguments, allowing
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# varargs functions.
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def p_param_0(t):
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'param : ID'
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t[0] = t[1]
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def p_param_1(t):
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'param : ASTERISK ID'
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# just concatenate them: '*ID'
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t[0] = t[1] + t[2]
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# End of format definition-related rules.
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##############
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#
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# A decode block looks like:
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# decode <field1> [, <field2>]* [default <inst>] { ... }
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#
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def p_decode_block(t):
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'decode_block : DECODE ID opt_default LBRACE decode_stmt_list RBRACE'
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default_defaults = defaultStack.pop()
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(decls, code, has_default) = t[5]
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# use the "default defaults" only if there was no explicit
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# default statement in decode_stmt_list
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if not has_default:
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(default_decls, default_code) = default_defaults
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decls += default_decls
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code += default_code
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t[0] = (decls, '''
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switch (%s) {
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%s
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}
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''' % (t[2], indent(code)))
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# The opt_default statement serves only to push the "default defaults"
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# onto defaultStack. This value will be used by nested decode blocks,
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# and used and popped off when the current decode_block is processed
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# (in p_decode_block() above).
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def p_opt_default_0(t):
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'opt_default : empty'
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# no default specified: reuse the one currently at the top of the stack
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defaultStack.push(defaultStack.top())
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# no meaningful value returned
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t[0] = None
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def p_opt_default_1(t):
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'opt_default : DEFAULT inst'
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# push the new default
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(decls, code) = t[2]
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defaultStack.push((decls, '\ndefault:\n%sbreak;' % code))
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# no meaningful value returned
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t[0] = None
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|
|
def p_decode_stmt_list_0(t):
|
|
'decode_stmt_list : decode_stmt'
|
|
t[0] = t[1]
|
|
|
|
def p_decode_stmt_list_1(t):
|
|
'decode_stmt_list : decode_stmt decode_stmt_list'
|
|
(decls1, code1, has_default1) = t[1]
|
|
(decls2, code2, has_default2) = t[2]
|
|
if (has_default1 and has_default2):
|
|
error(t.lineno(1), 'Two default cases in decode block')
|
|
t[0] = (decls1 + '\n' + decls2, code1 + '\n' + code2,
|
|
has_default1 or has_default2)
|
|
|
|
#
|
|
# 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 both the declaration and decode
|
|
# 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(t):
|
|
'decode_stmt : CPPDIRECTIVE'
|
|
t[0] = (t[1], t[1], 0)
|
|
|
|
# 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(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.
|
|
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(t):
|
|
'push_format_id : ID'
|
|
try:
|
|
formatStack.push(formatMap[t[1]])
|
|
t[0] = ('', '// format %s' % t[1])
|
|
except KeyError:
|
|
error(t.lineno(1), '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(t):
|
|
'decode_stmt : case_label COLON decode_block'
|
|
(label, is_default) = t[1]
|
|
(decls, code) = t[3]
|
|
# just wrap the decoding code from the block as a case in the
|
|
# outer switch statement.
|
|
t[0] = (decls, '\n%s:\n%s' % (label, indent(code)), is_default)
|
|
|
|
# Instruction definition (finally!).
|
|
def p_decode_stmt_inst(t):
|
|
'decode_stmt : case_label COLON inst SEMI'
|
|
(label, is_default) = t[1]
|
|
(decls, code) = t[3]
|
|
t[0] = (decls, '\n%s:%sbreak;' % (label, indent(code)), is_default)
|
|
|
|
# The case label is either a list of one or more constants or 'default'
|
|
def p_case_label_0(t):
|
|
'case_label : intlit_list'
|
|
t[0] = (': '.join(map(lambda a: 'case %#x' % a, t[1])), 0)
|
|
|
|
def p_case_label_1(t):
|
|
'case_label : DEFAULT'
|
|
t[0] = ('default', 1)
|
|
|
|
#
|
|
# 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(t):
|
|
'intlit_list : INTLIT'
|
|
t[0] = [t[1]]
|
|
|
|
def p_intlit_list_1(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(t):
|
|
'inst : ID LPAREN arg_list RPAREN'
|
|
# Pass the ID and arg list to the current format class to deal with.
|
|
currentFormat = formatStack.top()
|
|
(decls, code) = currentFormat.defineInst(t[1], t[3], t.lineno(1))
|
|
args = ','.join(map(str, t[3]))
|
|
args = re.sub('(?m)^', '//', args)
|
|
args = re.sub('^//', '', args)
|
|
comment = '// %s::%s(%s)\n' % (currentFormat.id, t[1], args)
|
|
t[0] = (comment + decls, comment + code)
|
|
|
|
# Define an instruction using an explicitly specified format:
|
|
# "<fmt>::<mnemonic>(<args>)"
|
|
def p_inst_1(t):
|
|
'inst : ID DBLCOLON ID LPAREN arg_list RPAREN'
|
|
try:
|
|
format = formatMap[t[1]]
|
|
except KeyError:
|
|
error(t.lineno(1), 'instruction format "%s" not defined.' % t[1])
|
|
(decls, code) = format.defineInst(t[3], t[5], t.lineno(1))
|
|
comment = '// %s::%s(%s)\n' % (t[1], t[3], t[5])
|
|
t[0] = (comment + decls, comment + code)
|
|
|
|
def p_arg_list_0(t):
|
|
'arg_list : empty'
|
|
t[0] = [ ]
|
|
|
|
def p_arg_list_1(t):
|
|
'arg_list : arg'
|
|
t[0] = [t[1]]
|
|
|
|
def p_arg_list_2(t):
|
|
'arg_list : arg_list COMMA arg'
|
|
t[0] = t[1]
|
|
t[0].append(t[3])
|
|
|
|
def p_arg(t):
|
|
'''arg : ID
|
|
| INTLIT
|
|
| STRLIT
|
|
| CODELIT'''
|
|
t[0] = t[1]
|
|
|
|
#
|
|
# Empty production... use in other rules for readability.
|
|
#
|
|
def p_empty(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(t):
|
|
if t:
|
|
error(t.lineno, "syntax error at '%s'" % t.value)
|
|
else:
|
|
error_bt(0, "unknown syntax error")
|
|
|
|
# END OF GRAMMAR RULES
|
|
#
|
|
# Now build the parser.
|
|
yacc.yacc()
|
|
|
|
################
|
|
# Format object.
|
|
#
|
|
# A format object encapsulates an instruction format. It must provide
|
|
# a defineInst() method that generates the code for an instruction
|
|
# definition.
|
|
|
|
class Format:
|
|
def __init__(self, id, params, code):
|
|
# constructor: just save away arguments
|
|
self.id = id
|
|
self.params = params
|
|
# strip blank lines from code (ones at the end are troublesome)
|
|
code = re.sub(r'(?m)^\s*$', '', code);
|
|
if code == '':
|
|
code = ' pass\n'
|
|
param_list = string.join(params, ", ")
|
|
f = 'def defInst(name, Name, ' + param_list + '):\n' + code
|
|
exec(f)
|
|
self.func = defInst
|
|
|
|
def defineInst(self, name, args, lineno):
|
|
# automatically provide a capitalized version of mnemonic
|
|
Name = string.capitalize(name)
|
|
try:
|
|
retval = self.func(name, Name, *args)
|
|
except:
|
|
error_bt(lineno, 'error defining "%s".' % name)
|
|
return retval
|
|
|
|
# Special null format to catch an implicit-format instruction
|
|
# definition outside of any format block.
|
|
class NoFormat:
|
|
def __init__(self):
|
|
self.defaultInst = ''
|
|
|
|
def defineInst(self, name, args, lineno):
|
|
error(lineno,
|
|
'instruction definition "%s" with no active format!' % name)
|
|
|
|
# This dictionary maps format name strings to Format objects.
|
|
formatMap = {}
|
|
|
|
# Define a new format
|
|
def defFormat(id, params, code, lineno):
|
|
# make sure we haven't already defined this one
|
|
if formatMap.get(id, None) != None:
|
|
error(lineno, 'format %s redefined.' % id)
|
|
# create new object and store in global map
|
|
formatMap[id] = Format(id, params, code)
|
|
|
|
|
|
##############
|
|
# Stack: a simple stack object. Used for both formats (formatStack)
|
|
# and default cases (defaultStack).
|
|
|
|
class Stack:
|
|
def __init__(self, initItem):
|
|
self.stack = [ initItem ]
|
|
|
|
def push(self, item):
|
|
self.stack.append(item);
|
|
|
|
def pop(self):
|
|
return self.stack.pop()
|
|
|
|
def top(self):
|
|
return self.stack[-1]
|
|
|
|
# The global format stack.
|
|
formatStack = Stack(NoFormat())
|
|
|
|
# The global default case stack.
|
|
defaultStack = Stack( None )
|
|
|
|
###################
|
|
# Utility functions
|
|
|
|
#
|
|
# Indent every line in string 's' by two spaces
|
|
# (except preprocessor directives).
|
|
# Used to make nested code blocks look pretty.
|
|
#
|
|
def indent(s):
|
|
return re.sub(r'(?m)^(?!\#)', ' ', s)
|
|
|
|
#
|
|
# Munge a somewhat arbitrarily formatted piece of Python code
|
|
# (e.g. from a format 'let' block) into something whose indentation
|
|
# will get by the Python parser.
|
|
#
|
|
# The two keys here are that Python will give a syntax error if
|
|
# there's any whitespace at the beginning of the first line, and that
|
|
# all lines at the same lexical nesting level must have identical
|
|
# indentation. Unfortunately the way code literals work, an entire
|
|
# let block tends to have some initial indentation. Rather than
|
|
# trying to figure out what that is and strip it off, we prepend 'if
|
|
# 1:' to make the let code the nested block inside the if (and have
|
|
# the parser automatically deal with the indentation for us).
|
|
#
|
|
# We don't want to do this if (1) the code block is empty or (2) the
|
|
# first line of the block doesn't have any whitespace at the front.
|
|
|
|
def fixPythonIndentation(s):
|
|
# get rid of blank lines first
|
|
s = re.sub(r'(?m)^\s*\n', '', s);
|
|
if (s != '' and re.match(r'[ \t]', s[0])):
|
|
s = 'if 1:\n' + s
|
|
return s
|
|
|
|
# Error handler. Just call exit. Output formatted to work under
|
|
# Emacs compile-mode.
|
|
def error(lineno, string):
|
|
sys.exit("%s:%d: %s" % (isa_desc_filename, lineno, string))
|
|
|
|
# Like error(), but include a Python stack backtrace (for processing
|
|
# Python exceptions).
|
|
def error_bt(lineno, string):
|
|
print >> sys.stderr, "%s:%d: %s" % (isa_desc_filename, lineno, string)
|
|
raise
|
|
|
|
|
|
#####################################################################
|
|
#
|
|
# Bitfield Operator Support
|
|
#
|
|
#####################################################################
|
|
|
|
bitOp1ArgRE = re.compile(r'<\s*(\w+)\s*:\s*>')
|
|
|
|
bitOpWordRE = re.compile(r'(?<![\w\.])([\w\.]+)<\s*(\w+)\s*:\s*(\w+)\s*>')
|
|
bitOpExprRE = re.compile(r'\)<\s*(\w+)\s*:\s*(\w+)\s*>')
|
|
|
|
def substBitOps(code):
|
|
# first convert single-bit selectors to two-index form
|
|
# i.e., <n> --> <n:n>
|
|
code = bitOp1ArgRE.sub(r'<\1:\1>', code)
|
|
# simple case: selector applied to ID (name)
|
|
# i.e., foo<a:b> --> bits(foo, a, b)
|
|
code = bitOpWordRE.sub(r'bits(\1, \2, \3)', code)
|
|
# if selector is applied to expression (ending in ')'),
|
|
# we need to search backward for matching '('
|
|
match = bitOpExprRE.search(code)
|
|
while match:
|
|
exprEnd = match.start()
|
|
here = exprEnd - 1
|
|
nestLevel = 1
|
|
while nestLevel > 0:
|
|
if code[here] == '(':
|
|
nestLevel -= 1
|
|
elif code[here] == ')':
|
|
nestLevel += 1
|
|
here -= 1
|
|
if here < 0:
|
|
sys.exit("Didn't find '('!")
|
|
exprStart = here+1
|
|
newExpr = r'bits(%s, %s, %s)' % (code[exprStart:exprEnd+1],
|
|
match.group(1), match.group(2))
|
|
code = code[:exprStart] + newExpr + code[match.end():]
|
|
match = bitOpExprRE.search(code)
|
|
return code
|
|
|
|
|
|
#####################################################################
|
|
#
|
|
# Code Parser
|
|
#
|
|
# The remaining code is the support for automatically extracting
|
|
# instruction characteristics from pseudocode.
|
|
#
|
|
#####################################################################
|
|
|
|
# Force the argument to be a list
|
|
def makeList(list_or_item):
|
|
if not list_or_item:
|
|
return []
|
|
elif type(list_or_item) == ListType:
|
|
return list_or_item
|
|
else:
|
|
return [ list_or_item ]
|
|
|
|
# generate operandSizeMap based on provided operandTypeMap:
|
|
# basically generate equiv. C++ type and make is_signed flag
|
|
def buildOperandSizeMap():
|
|
global operandSizeMap
|
|
operandSizeMap = {}
|
|
for ext in operandTypeMap.keys():
|
|
(desc, size) = operandTypeMap[ext]
|
|
if desc == 'signed int':
|
|
type = 'int%d_t' % size
|
|
is_signed = 1
|
|
elif desc == 'unsigned int':
|
|
type = 'uint%d_t' % size
|
|
is_signed = 0
|
|
elif desc == 'float':
|
|
is_signed = 1 # shouldn't really matter
|
|
if size == 32:
|
|
type = 'float'
|
|
elif size == 64:
|
|
type = 'double'
|
|
if type == '':
|
|
error(0, 'Unrecognized type description "%s" in operandTypeMap')
|
|
operandSizeMap[ext] = (size, type, is_signed)
|
|
|
|
#
|
|
# Base class for operand traits. An instance of this class (or actually
|
|
# a class derived from this one) encapsulates the traits of a particular
|
|
# operand type (e.g., "32-bit integer register").
|
|
#
|
|
class OperandTraits:
|
|
def __init__(self, dflt_ext, reg_spec, flags, sort_pri):
|
|
# Force construction of operandSizeMap from operandTypeMap
|
|
# if it hasn't happened yet
|
|
if not globals().has_key('operandSizeMap'):
|
|
buildOperandSizeMap()
|
|
self.dflt_ext = dflt_ext
|
|
(self.dflt_size, self.dflt_type, self.dflt_is_signed) = \
|
|
operandSizeMap[dflt_ext]
|
|
self.reg_spec = reg_spec
|
|
# 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')
|
|
self.flags = ( [], [], [] )
|
|
elif type(flags) == StringType:
|
|
# a single flag: assumed to be unconditional
|
|
self.flags = ( [ flags ], [], [] )
|
|
elif type(flags) == ListType:
|
|
# a list of flags: also assumed to be unconditional
|
|
self.flags = ( flags, [], [] )
|
|
elif type(flags) == TupleType:
|
|
# 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
|
|
self.flags = (makeList(uncond_flags),
|
|
makeList(src_flags), makeList(dest_flags))
|
|
self.sort_pri = sort_pri
|
|
|
|
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 getFlags(self, op_desc):
|
|
# note the empty slice '[:]' gives us a copy of self.flags[0]
|
|
# instead of a reference to it
|
|
my_flags = self.flags[0][:]
|
|
if op_desc.is_src:
|
|
my_flags += self.flags[1]
|
|
if op_desc.is_dest:
|
|
my_flags += self.flags[2]
|
|
return my_flags
|
|
|
|
def makeDecl(self, op_desc):
|
|
(size, type, is_signed) = operandSizeMap[op_desc.eff_ext]
|
|
# Note that initializations in the declarations are solely
|
|
# to avoid 'uninitialized variable' errors from the compiler.
|
|
return type + ' ' + op_desc.munged_name + ' = 0;\n';
|
|
|
|
class IntRegOperandTraits(OperandTraits):
|
|
def isReg(self):
|
|
return 1
|
|
|
|
def isIntReg(self):
|
|
return 1
|
|
|
|
def makeConstructor(self, op_desc):
|
|
c = ''
|
|
if op_desc.is_src:
|
|
c += '\n\t_srcRegIdx[%d] = %s;' % \
|
|
(op_desc.src_reg_idx, self.reg_spec)
|
|
if op_desc.is_dest:
|
|
c += '\n\t_destRegIdx[%d] = %s;' % \
|
|
(op_desc.dest_reg_idx, self.reg_spec)
|
|
return c
|
|
|
|
def makeRead(self, op_desc, cpu_model):
|
|
(size, type, is_signed) = operandSizeMap[op_desc.eff_ext]
|
|
if (type == 'float' or type == 'double'):
|
|
error(0, 'Attempt to read integer register as FP')
|
|
if (size == self.dflt_size):
|
|
return '%s = xc->readIntReg(_srcRegIdx[%d]);\n' % \
|
|
(op_desc.munged_name, op_desc.src_reg_idx)
|
|
else:
|
|
return '%s = bits(xc->readIntReg(_srcRegIdx[%d]), %d, 0);\n' % \
|
|
(op_desc.munged_name, op_desc.src_reg_idx, size-1)
|
|
|
|
def makeWrite(self, op_desc, cpu_model):
|
|
(size, type, is_signed) = operandSizeMap[op_desc.eff_ext]
|
|
if (type == 'float' or type == 'double'):
|
|
error(0, 'Attempt to write integer register as FP')
|
|
if (size != self.dflt_size and is_signed):
|
|
final_val = 'sext<%d>(%s)' % (size, op_desc.munged_name)
|
|
else:
|
|
final_val = op_desc.munged_name
|
|
wb = '''
|
|
{
|
|
%s final_val = %s;
|
|
xc->setIntReg(_destRegIdx[%d], final_val);\n
|
|
if (traceData) { traceData->setData(final_val); }
|
|
}''' % (self.dflt_type, final_val, op_desc.dest_reg_idx)
|
|
return wb
|
|
|
|
class FloatRegOperandTraits(OperandTraits):
|
|
def isReg(self):
|
|
return 1
|
|
|
|
def isFloatReg(self):
|
|
return 1
|
|
|
|
def makeConstructor(self, op_desc):
|
|
c = ''
|
|
if op_desc.is_src:
|
|
c += '\n\t_srcRegIdx[%d] = %s + FP_Base_DepTag;' % \
|
|
(op_desc.src_reg_idx, self.reg_spec)
|
|
if op_desc.is_dest:
|
|
c += '\n\t_destRegIdx[%d] = %s + FP_Base_DepTag;' % \
|
|
(op_desc.dest_reg_idx, self.reg_spec)
|
|
return c
|
|
|
|
def makeRead(self, op_desc, cpu_model):
|
|
(size, type, is_signed) = operandSizeMap[op_desc.eff_ext]
|
|
bit_select = 0
|
|
if (type == 'float'):
|
|
func = 'readFloatRegSingle'
|
|
elif (type == 'double'):
|
|
func = 'readFloatRegDouble'
|
|
else:
|
|
func = 'readFloatRegInt'
|
|
if (size != self.dflt_size):
|
|
bit_select = 1
|
|
base = 'xc->%s(_srcRegIdx[%d] - FP_Base_DepTag)' % \
|
|
(func, op_desc.src_reg_idx)
|
|
if bit_select:
|
|
return '%s = bits(%s, %d, 0);\n' % \
|
|
(op_desc.munged_name, base, size-1)
|
|
else:
|
|
return '%s = %s;\n' % (op_desc.munged_name, base)
|
|
|
|
def makeWrite(self, op_desc, cpu_model):
|
|
(size, type, is_signed) = operandSizeMap[op_desc.eff_ext]
|
|
final_val = op_desc.munged_name
|
|
if (type == 'float'):
|
|
func = 'setFloatRegSingle'
|
|
elif (type == 'double'):
|
|
func = 'setFloatRegDouble'
|
|
else:
|
|
func = 'setFloatRegInt'
|
|
type = 'uint%d_t' % self.dflt_size
|
|
if (size != self.dflt_size and is_signed):
|
|
final_val = 'sext<%d>(%s)' % (size, op_desc.munged_name)
|
|
wb = '''
|
|
{
|
|
%s final_val = %s;
|
|
xc->%s(_destRegIdx[%d] - FP_Base_DepTag, final_val);\n
|
|
if (traceData) { traceData->setData(final_val); }
|
|
}''' % (type, final_val, func, op_desc.dest_reg_idx)
|
|
return wb
|
|
|
|
class ControlRegOperandTraits(OperandTraits):
|
|
def isReg(self):
|
|
return 1
|
|
|
|
def isControlReg(self):
|
|
return 1
|
|
|
|
def makeConstructor(self, op_desc):
|
|
c = ''
|
|
if op_desc.is_src:
|
|
c += '\n\t_srcRegIdx[%d] = %s_DepTag;' % \
|
|
(op_desc.src_reg_idx, self.reg_spec)
|
|
if op_desc.is_dest:
|
|
c += '\n\t_destRegIdx[%d] = %s_DepTag;' % \
|
|
(op_desc.dest_reg_idx, self.reg_spec)
|
|
return c
|
|
|
|
def makeRead(self, op_desc, cpu_model):
|
|
(size, type, is_signed) = operandSizeMap[op_desc.eff_ext]
|
|
bit_select = 0
|
|
if (type == 'float' or type == 'double'):
|
|
error(0, 'Attempt to read control register as FP')
|
|
base = 'xc->read%s()' % self.reg_spec
|
|
if size == self.dflt_size:
|
|
return '%s = %s;\n' % (op_desc.munged_name, base)
|
|
else:
|
|
return '%s = bits(%s, %d, 0);\n' % \
|
|
(op_desc.munged_name, base, size-1)
|
|
|
|
def makeWrite(self, op_desc, cpu_model):
|
|
(size, type, is_signed) = operandSizeMap[op_desc.eff_ext]
|
|
if (type == 'float' or type == 'double'):
|
|
error(0, 'Attempt to write control register as FP')
|
|
wb = 'xc->set%s(%s);\n' % (self.reg_spec, op_desc.munged_name)
|
|
wb += 'if (traceData) { traceData->setData(%s); }' % \
|
|
op_desc.munged_name
|
|
return wb
|
|
|
|
class MemOperandTraits(OperandTraits):
|
|
def isMem(self):
|
|
return 1
|
|
|
|
def makeConstructor(self, op_desc):
|
|
return ''
|
|
|
|
def makeDecl(self, op_desc):
|
|
(size, type, is_signed) = operandSizeMap[op_desc.eff_ext]
|
|
# Note that initializations in the declarations are solely
|
|
# to avoid 'uninitialized variable' errors from the compiler.
|
|
# Declare memory data variable.
|
|
c = '%s %s = 0;\n' % (type, op_desc.munged_name)
|
|
# Declare var to hold memory access flags.
|
|
c += 'unsigned %s_flags = memAccessFlags;\n' % op_desc.base_name
|
|
# If this operand is a dest (i.e., it's a store operation),
|
|
# then we need to declare a variable for the write result code
|
|
# as well.
|
|
if op_desc.is_dest:
|
|
c += 'uint64_t %s_write_result = 0;\n' % op_desc.base_name
|
|
return c
|
|
|
|
def makeRead(self, op_desc, cpu_model):
|
|
(size, type, is_signed) = operandSizeMap[op_desc.eff_ext]
|
|
eff_type = 'uint%d_t' % size
|
|
return 'fault = memAccessObj->read(EA, (%s&)%s, %s_flags);\n' \
|
|
% (eff_type, op_desc.munged_name, op_desc.base_name)
|
|
|
|
def makeWrite(self, op_desc, cpu_model):
|
|
(size, type, is_signed) = operandSizeMap[op_desc.eff_ext]
|
|
eff_type = 'uint%d_t' % size
|
|
return 'fault = memAccessObj->write((%s&)%s, EA, %s_flags,' \
|
|
' &%s_write_result);\n' \
|
|
% (eff_type, op_desc.munged_name, op_desc.base_name,
|
|
op_desc.base_name)
|
|
|
|
class NPCOperandTraits(OperandTraits):
|
|
def makeConstructor(self, op_desc):
|
|
return ''
|
|
|
|
def makeRead(self, op_desc, cpu_model):
|
|
return '%s = xc->readPC() + 4;\n' % op_desc.munged_name
|
|
|
|
def makeWrite(self, op_desc, cpu_model):
|
|
return 'xc->setNextPC(%s);\n' % op_desc.munged_name
|
|
|
|
|
|
#
|
|
# Define operand variables that get derived from the basic declaration
|
|
# of ISA-specific operands in operandTraitsMap. This function must be
|
|
# called by the ISA description file explicitly after defining
|
|
# operandTraitsMap (in a 'let' block).
|
|
#
|
|
def defineDerivedOperandVars():
|
|
global operands
|
|
operands = operandTraitsMap.keys()
|
|
|
|
operandsREString = (r'''
|
|
(?<![\w\.]) # neg. lookbehind assertion: prevent partial matches
|
|
((%s)(?:\.(\w+))?) # match: operand with optional '.' then suffix
|
|
(?![\w\.]) # neg. lookahead assertion: prevent partial matches
|
|
'''
|
|
% string.join(operands, '|'))
|
|
|
|
global operandsRE
|
|
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)\.(\w+)(?![\w\.])'
|
|
% string.join(operands, '|'))
|
|
|
|
global operandsWithExtRE
|
|
operandsWithExtRE = re.compile(operandsWithExtREString, re.MULTILINE)
|
|
|
|
|
|
#
|
|
# Operand descriptor class. An instance of this class represents
|
|
# a specific operand for a code block.
|
|
#
|
|
class OperandDescriptor:
|
|
def __init__(self, full_name, base_name, ext, is_src, is_dest):
|
|
self.full_name = full_name
|
|
self.base_name = base_name
|
|
self.ext = ext
|
|
self.is_src = is_src
|
|
self.is_dest = is_dest
|
|
self.traits = operandTraitsMap[base_name]
|
|
# The 'effective extension' (eff_ext) is either the actual
|
|
# extension, if one was explicitly provided, or the default.
|
|
# The 'munged name' replaces the '.' between the base and
|
|
# extension (if any) with a '_' to make a legal C++ variable name.
|
|
if ext:
|
|
self.eff_ext = ext
|
|
self.munged_name = base_name + '_' + ext
|
|
else:
|
|
self.eff_ext = self.traits.dflt_ext
|
|
self.munged_name = base_name
|
|
|
|
# Finalize additional fields (primarily code fields). This step
|
|
# is done separately since some of these fields may depend on the
|
|
# register index enumeration that hasn't been performed yet at the
|
|
# time of __init__().
|
|
def finalize(self):
|
|
self.flags = self.traits.getFlags(self)
|
|
self.constructor = self.traits.makeConstructor(self)
|
|
self.exec_decl = self.traits.makeDecl(self)
|
|
|
|
if self.is_src:
|
|
self.simple_rd = self.traits.makeRead(self, 'simple')
|
|
self.dtld_rd = self.traits.makeRead(self, 'dtld')
|
|
else:
|
|
self.simple_rd = ''
|
|
self.dtld_rd = ''
|
|
|
|
if self.is_dest:
|
|
self.simple_wb = self.traits.makeWrite(self, 'simple')
|
|
self.dtld_wb = self.traits.makeWrite(self, 'dtld')
|
|
else:
|
|
self.simple_wb = ''
|
|
self.dtld_wb = ''
|
|
|
|
class OperandDescriptorList:
|
|
def __init__(self):
|
|
self.items = []
|
|
self.bases = {}
|
|
|
|
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.traits.sort_pri - b.traits.sort_pri)
|
|
|
|
# Regular expression object to match C++ comments
|
|
# (used in findOperands())
|
|
commentRE = re.compile(r'//.*\n')
|
|
|
|
# Regular expression object to match assignment statements
|
|
# (used in findOperands())
|
|
assignRE = re.compile(r'\s*=(?!=)', re.MULTILINE)
|
|
|
|
#
|
|
# Find all the operands in the given code block. Returns an operand
|
|
# descriptor list (instance of class OperandDescriptorList).
|
|
#
|
|
def findOperands(code):
|
|
operands = OperandDescriptorList()
|
|
# delete comments so we don't accidentally match on reg specifiers inside
|
|
code = commentRE.sub('', code)
|
|
# search for operands
|
|
next_pos = 0
|
|
while 1:
|
|
match = 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 = operands.find_base(op_base)
|
|
if op_desc:
|
|
if op_desc.ext != op_ext:
|
|
error(0, '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 = OperandDescriptor(op_full, op_base, op_ext,
|
|
is_src, is_dest)
|
|
operands.append(op_desc)
|
|
# start next search after end of current match
|
|
next_pos = match.end()
|
|
operands.sort()
|
|
# enumerate source & dest register operands... used in building
|
|
# constructor later
|
|
srcRegs = 0
|
|
destRegs = 0
|
|
operands.numFPDestRegs = 0
|
|
operands.numIntDestRegs = 0
|
|
for op_desc in operands:
|
|
if op_desc.traits.isReg():
|
|
if op_desc.is_src:
|
|
op_desc.src_reg_idx = srcRegs
|
|
srcRegs += 1
|
|
if op_desc.is_dest:
|
|
op_desc.dest_reg_idx = destRegs
|
|
destRegs += 1
|
|
if op_desc.traits.isFloatReg():
|
|
operands.numFPDestRegs += 1
|
|
elif op_desc.traits.isIntReg():
|
|
operands.numIntDestRegs += 1
|
|
operands.numSrcRegs = srcRegs
|
|
operands.numDestRegs = destRegs
|
|
# now make a final pass to finalize op_desc fields that may depend
|
|
# on the register enumeration
|
|
for op_desc in operands:
|
|
op_desc.finalize()
|
|
return operands
|
|
|
|
# Munge operand names in code string to make legal C++ variable names.
|
|
# (Will match munged_name attribute of OperandDescriptor object.)
|
|
def substMungedOpNames(code):
|
|
return operandsWithExtRE.sub(r'\1_\2', code)
|
|
|
|
def joinLists(t):
|
|
return map(string.join, t)
|
|
|
|
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
|
|
|
|
class CodeBlock:
|
|
def __init__(self, code):
|
|
self.orig_code = code
|
|
self.operands = findOperands(code)
|
|
self.code = substMungedOpNames(substBitOps(code))
|
|
self.constructor = self.operands.concatAttrStrings('constructor')
|
|
self.constructor += \
|
|
'\n\t_numSrcRegs = %d;' % self.operands.numSrcRegs
|
|
self.constructor += \
|
|
'\n\t_numDestRegs = %d;' % self.operands.numDestRegs
|
|
self.constructor += \
|
|
'\n\t_numFPDestRegs = %d;' % self.operands.numFPDestRegs
|
|
self.constructor += \
|
|
'\n\t_numIntDestRegs = %d;' % self.operands.numIntDestRegs
|
|
|
|
self.exec_decl = self.operands.concatAttrStrings('exec_decl')
|
|
|
|
is_mem = lambda op: op.traits.isMem()
|
|
not_mem = lambda op: not op.traits.isMem()
|
|
|
|
self.simple_rd = self.operands.concatAttrStrings('simple_rd')
|
|
self.simple_wb = self.operands.concatAttrStrings('simple_wb')
|
|
self.simple_mem_rd = \
|
|
self.operands.concatSomeAttrStrings(is_mem, 'simple_rd')
|
|
self.simple_mem_wb = \
|
|
self.operands.concatSomeAttrStrings(is_mem, 'simple_wb')
|
|
self.simple_nonmem_rd = \
|
|
self.operands.concatSomeAttrStrings(not_mem, 'simple_rd')
|
|
self.simple_nonmem_wb = \
|
|
self.operands.concatSomeAttrStrings(not_mem, 'simple_wb')
|
|
|
|
self.dtld_rd = self.operands.concatAttrStrings('dtld_rd')
|
|
self.dtld_wb = self.operands.concatAttrStrings('dtld_wb')
|
|
self.dtld_mem_rd = \
|
|
self.operands.concatSomeAttrStrings(is_mem, 'dtld_rd')
|
|
self.dtld_mem_wb = \
|
|
self.operands.concatSomeAttrStrings(is_mem, 'dtld_wb')
|
|
self.dtld_nonmem_rd = \
|
|
self.operands.concatSomeAttrStrings(not_mem, 'dtld_rd')
|
|
self.dtld_nonmem_wb = \
|
|
self.operands.concatSomeAttrStrings(not_mem, 'dtld_wb')
|
|
|
|
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 will be overridden
|
|
# later otherwise.
|
|
if 'IsStore' in self.flags:
|
|
self.op_class = 'WrPort'
|
|
elif 'IsLoad' in self.flags or 'IsPrefetch' in self.flags:
|
|
self.op_class = 'RdPort'
|
|
elif 'IsFloating' in self.flags:
|
|
self.op_class = 'FloatADD'
|
|
else:
|
|
self.op_class = 'IntALU'
|
|
|
|
# Assume all instruction flags are of the form 'IsFoo'
|
|
instFlagRE = re.compile(r'Is.*')
|
|
|
|
# OpClass constants are just a little more complicated
|
|
opClassRE = re.compile(r'Int.*|Float.*|.*Port|No_OpClass')
|
|
|
|
class InstObjParams:
|
|
def __init__(self, mnem, class_name, base_class = '',
|
|
code_block = None, opt_args = []):
|
|
self.mnemonic = mnem
|
|
self.class_name = class_name
|
|
self.base_class = base_class
|
|
if code_block:
|
|
for code_attr in code_block.__dict__.keys():
|
|
setattr(self, code_attr, getattr(code_block, code_attr))
|
|
else:
|
|
self.constructor = ''
|
|
self.flags = []
|
|
# 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(0, '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 = ''
|
|
|
|
def subst(self, *args):
|
|
result = []
|
|
for t in args:
|
|
if not templateMap.has_key(t):
|
|
error(0, 'InstObjParams::subst: undefined template "%s"' % t)
|
|
try:
|
|
result.append(templateMap[t] % self.__dict__)
|
|
except KeyError, key:
|
|
error(0, 'InstObjParams::subst: no definition for "%s"' % key)
|
|
if len(args) == 1:
|
|
result = result[0]
|
|
return result
|
|
|
|
#
|
|
# All set... read in and parse the ISA description.
|
|
#
|
|
yacc.parse(isa_desc)
|