1d545281b9
out CPU model. ISA description now generates multiple
output source files to (in theory) reduce compilation time.
arch/alpha/isa_desc:
Update for parser changes. Move most constructors
out of class declarations (which are now in decoder.hh)
and into decoder.cc. Move all execute() methods into
exec output.
arch/isa_parser.py:
Significant changes to make ISA description completely
independent of CPU model, and isolate model-dependent parts
of parser into one little class (CpuModel). Also split up code
output into multiple files (a header, a main source file, and
per-cpu execute() method files).
Noticeable changes to language as a result. See updated Doxygen
documentation.
cpu/simple_cpu/simple_cpu.hh:
SimpleCPUExecContext typedef no longer needed.
Add forward declaration of Process.
cpu/static_inst.hh:
SimpleCPUExecContext and FullCPUExecContext typedefs no longer needed.
Make eaCompInst() and memAccInst() return const refs.
--HG--
extra : convert_revision : 71471f267804fafd0a881bac7445677e76334daf
1664 lines
58 KiB
Python
Executable file
1664 lines
58 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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import traceback
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# get type names
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from types import *
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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', 'DECODE', 'DECODER', 'DEFAULT', 'DEF', 'EXEC', 'FORMAT',
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'HEADER', 'LET', 'NAMESPACE', 'OPERAND_TYPES', 'OPERANDS',
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'OUTPUT', '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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# 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_outputs name_decl opt_defs_and_outputs decode_block'
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global_code = t[1]
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isa_name = t[2]
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namespace = isa_name + "Inst"
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# wrap the decode block as a function definition
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t[4].wrap_decode_block('''
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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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''' % vars(), '}')
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# both the latter output blocks and the decode block are in the namespace
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namespace_code = t[3] + t[4]
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# pass it all back to the caller of yacc.parse()
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t[0] = (isa_name, namespace, global_code, namespace_code)
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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_outputs' is a possibly empty sequence of
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# def and/or output statements.
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def p_opt_defs_and_outputs_0(t):
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'opt_defs_and_outputs : empty'
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t[0] = GenCode()
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def p_opt_defs_and_outputs_1(t):
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'opt_defs_and_outputs : defs_and_outputs'
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t[0] = t[1]
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def p_defs_and_outputs_0(t):
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'defs_and_outputs : def_or_output'
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t[0] = t[1]
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def p_defs_and_outputs_1(t):
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'defs_and_outputs : defs_and_outputs def_or_output'
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t[0] = t[1] + t[2]
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# The list of possible definition/output statements.
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def p_def_or_output(t):
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'''def_or_output : def_format
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| def_bitfield
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| def_template
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| def_operand_types
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| def_operands
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| output_header
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| output_decoder
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| output_exec
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| global_let'''
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t[0] = t[1]
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# Output blocks 'output <foo> {{...}}' (C++ code blocks) are copied
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# directly to the appropriate output section.
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# Massage output block by substituting in template definitions and bit
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# operators. We handle '%'s embedded in the string that don't
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# indicate template substitutions (or CPU-specific symbols, which get
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# handled in GenCode) by doubling them first so that the format
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# operation will reduce them back to single '%'s.
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def process_output(s):
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# protect any non-substitution '%'s (not followed by '(')
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s = re.sub(r'%(?!\()', '%%', s)
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# protects cpu-specific symbols too
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s = protect_cpu_symbols(s)
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return substBitOps(s % templateMap)
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def p_output_header(t):
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'output_header : OUTPUT HEADER CODELIT SEMI'
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t[0] = GenCode(header_output = process_output(t[3]))
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def p_output_decoder(t):
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'output_decoder : OUTPUT DECODER CODELIT SEMI'
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t[0] = GenCode(decoder_output = process_output(t[3]))
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def p_output_exec(t):
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'output_exec : OUTPUT EXEC CODELIT SEMI'
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t[0] = GenCode(exec_output = process_output(t[3]))
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# global let blocks 'let {{...}}' (Python code blocks) are executed
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# directly when seen. Note that these execute in a special variable
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# context 'exportContext' to prevent the code from polluting this
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# script's namespace.
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def p_global_let(t):
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'global_let : LET CODELIT SEMI'
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updateExportContext()
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try:
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exec fixPythonIndentation(t[2]) in exportContext
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except Exception, exc:
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error(t.lineno(1),
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'error: %s in global let block "%s".' % (exc, t[2]))
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t[0] = GenCode() # contributes nothing to the output C++ file
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# Define the mapping from operand type extensions to C++ types and bit
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# widths (stored in operandTypeMap).
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def p_def_operand_types(t):
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'def_operand_types : DEF OPERAND_TYPES CODELIT SEMI'
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s = 'global operandTypeMap; operandTypeMap = {' + t[3] + '}'
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try:
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exec s
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except Exception, exc:
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error(t.lineno(1),
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'error: %s in def operand_types block "%s".' % (exc, t[3]))
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t[0] = GenCode() # contributes nothing to the output C++ file
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# Define the mapping from operand names to operand classes and other
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# traits. Stored in operandTraitsMap.
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def p_def_operands(t):
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'def_operands : DEF OPERANDS CODELIT SEMI'
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s = 'global operandTraitsMap; operandTraitsMap = {' + t[3] + '}'
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try:
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exec s
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except Exception, exc:
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error(t.lineno(1),
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'error: %s in def operands block "%s".' % (exc, t[3]))
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defineDerivedOperandVars()
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t[0] = GenCode() # 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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hash_define = '#undef %s\n#define %s\t%s\n' % (t[4], t[4], expr)
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t[0] = GenCode(header_output = hash_define)
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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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hash_define = '#undef %s\n#define %s\t%s\n' % (t[4], t[4], expr)
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t[0] = GenCode(header_output = hash_define)
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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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|
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# Global map variable to hold templates
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templateMap = {}
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|
|
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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]] = Template(t[4])
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t[0] = GenCode()
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|
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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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t[0] = GenCode()
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|
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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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|
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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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|
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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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|
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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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|
|
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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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codeObj = 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 codeObj.has_decode_default:
|
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codeObj += default_defaults
|
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codeObj.wrap_decode_block('switch (%s) {\n' % t[2], '}\n')
|
|
t[0] = codeObj
|
|
|
|
# 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
|
|
|
|
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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codeObj = t[2]
|
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codeObj.wrap_decode_block('\ndefault:\n', 'break;\n')
|
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defaultStack.push(codeObj)
|
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# no meaningful value returned
|
|
t[0] = None
|
|
|
|
def p_decode_stmt_list_0(t):
|
|
'decode_stmt_list : decode_stmt'
|
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t[0] = t[1]
|
|
|
|
def p_decode_stmt_list_1(t):
|
|
'decode_stmt_list : decode_stmt decode_stmt_list'
|
|
if (t[1].has_decode_default and t[2].has_decode_default):
|
|
error(t.lineno(1), '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(t):
|
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'decode_stmt : CPPDIRECTIVE'
|
|
t[0] = GenCode(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(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 = 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(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(t):
|
|
'case_label : intlit_list'
|
|
t[0] = ': '.join(map(lambda a: 'case %#x' % a, t[1]))
|
|
|
|
def p_case_label_1(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(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()
|
|
codeObj = 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 = '\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(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])
|
|
codeObj = format.defineInst(t[3], t[5], t.lineno(1))
|
|
comment = '\n// %s::%s(%s)\n' % (t[1], t[3], t[5])
|
|
codeObj.prepend_all(comment)
|
|
t[0] = codeObj
|
|
|
|
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()
|
|
|
|
|
|
#####################################################################
|
|
#
|
|
# Support Classes
|
|
#
|
|
#####################################################################
|
|
|
|
################
|
|
# CpuModel class
|
|
#
|
|
# The CpuModel class encapsulates everything we need to know about a
|
|
# particular CPU model.
|
|
|
|
class CpuModel:
|
|
# List of all CPU models. Accessible as CpuModel.list.
|
|
list = []
|
|
|
|
# Constructor. Automatically adds models to CpuModel.list.
|
|
def __init__(self, name, filename, includes, strings):
|
|
self.name = name
|
|
self.filename = filename # filename for output exec code
|
|
self.includes = includes # include files needed in exec file
|
|
# The 'strings' dict holds all the per-CPU symbols we can
|
|
# substitute into templates etc.
|
|
self.strings = strings
|
|
# Add self to list.
|
|
CpuModel.list.append(self)
|
|
|
|
# Define CPU models. The following lines should contain the only
|
|
# CPU-model-specific information in this file. Note that the ISA
|
|
# description itself should have *no* CPU-model-specific content.
|
|
CpuModel('SimpleCPU', 'simple_cpu_exec.cc',
|
|
'#include "cpu/simple_cpu/simple_cpu.hh"',
|
|
{ 'CPU_exec_context': 'SimpleCPU' })
|
|
CpuModel('FullCPU', 'full_cpu_exec.cc',
|
|
'#include "cpu/full_cpu/dyn_inst.hh"',
|
|
{ 'CPU_exec_context': 'DynInst' })
|
|
|
|
# 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.
|
|
def expand_cpu_symbols_to_dict(template):
|
|
# Protect '%'s that don't go with CPU-specific terms
|
|
t = re.sub(r'%(?!\(CPU_)', '%%', template)
|
|
result = {}
|
|
for cpu in CpuModel.list:
|
|
result[cpu.name] = t % cpu.strings
|
|
return result
|
|
|
|
# *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.
|
|
def expand_cpu_symbols_to_string(template):
|
|
if template.find('%(CPU_') != -1:
|
|
return reduce(lambda x,y: x+y,
|
|
expand_cpu_symbols_to_dict(template).values())
|
|
else:
|
|
return template
|
|
|
|
# Protect CPU-specific references by doubling the corresponding '%'s
|
|
# (in preparation for substituting a different set of references into
|
|
# the template).
|
|
def protect_cpu_symbols(template):
|
|
return re.sub(r'%(?=\(CPU_)', '%%', template)
|
|
|
|
###############
|
|
# GenCode class
|
|
#
|
|
# The GenCode class encapsulates generated code destined for various
|
|
# output files. The header_output and decoder_output attributes are
|
|
# strings containing code destined for decoder.hh and decoder.cc
|
|
# respectively. The decode_block attribute contains code to be
|
|
# incorporated in the decode function itself (that will also end up in
|
|
# decoder.cc). The exec_output attribute is a dictionary with a key
|
|
# for each CPU model name; the value associated with a particular key
|
|
# is the string of code for that CPU model's exec.cc file. The
|
|
# has_decode_default attribute is used in the decode block to allow
|
|
# explicit default clauses to override default default clauses.
|
|
|
|
class GenCode:
|
|
# Constructor. At this point we substitute out all CPU-specific
|
|
# symbols. For the exec output, these go into the per-model
|
|
# dictionary. For all other output types they get collapsed into
|
|
# a single string.
|
|
def __init__(self,
|
|
header_output = '', decoder_output = '', exec_output = '',
|
|
decode_block = '', has_decode_default = False):
|
|
self.header_output = expand_cpu_symbols_to_string(header_output)
|
|
self.decoder_output = expand_cpu_symbols_to_string(decoder_output)
|
|
if isinstance(exec_output, dict):
|
|
self.exec_output = exec_output
|
|
elif isinstance(exec_output, str):
|
|
# If the exec_output arg is a single string, we replicate
|
|
# it for each of the CPU models, substituting and
|
|
# %(CPU_foo)s params appropriately.
|
|
self.exec_output = expand_cpu_symbols_to_dict(exec_output)
|
|
self.decode_block = expand_cpu_symbols_to_string(decode_block)
|
|
self.has_decode_default = has_decode_default
|
|
|
|
# Override '+' operator: generate a new GenCode object that
|
|
# concatenates all the individual strings in the operands.
|
|
def __add__(self, other):
|
|
exec_output = {}
|
|
for cpu in CpuModel.list:
|
|
n = cpu.name
|
|
exec_output[n] = self.exec_output[n] + other.exec_output[n]
|
|
return GenCode(self.header_output + other.header_output,
|
|
self.decoder_output + other.decoder_output,
|
|
exec_output,
|
|
self.decode_block + other.decode_block,
|
|
self.has_decode_default or other.has_decode_default)
|
|
|
|
# Prepend a string (typically a comment) to all the strings.
|
|
def prepend_all(self, pre):
|
|
self.header_output = pre + self.header_output
|
|
self.decoder_output = pre + self.decoder_output
|
|
self.decode_block = pre + self.decode_block
|
|
for cpu in CpuModel.list:
|
|
self.exec_output[cpu.name] = pre + self.exec_output[cpu.name]
|
|
|
|
# Wrap the decode block in a pair of strings (e.g., 'case foo:'
|
|
# and 'break;'). Used to build the big nested switch statement.
|
|
def wrap_decode_block(self, pre, post = ''):
|
|
self.decode_block = pre + indent(self.decode_block) + post
|
|
|
|
################
|
|
# 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
|
|
label = 'def format ' + id
|
|
self.user_code = compile(fixPythonIndentation(code), label, 'exec')
|
|
param_list = string.join(params, ", ")
|
|
f = '''def defInst(_code, _context, %s):
|
|
my_locals = vars().copy()
|
|
exec _code in _context, my_locals
|
|
return my_locals\n''' % param_list
|
|
c = compile(f, label + ' wrapper', 'exec')
|
|
exec c
|
|
self.func = defInst
|
|
|
|
def defineInst(self, name, args, lineno):
|
|
context = {}
|
|
updateExportContext()
|
|
context.update(exportContext)
|
|
context.update({ 'name': name, 'Name': string.capitalize(name) })
|
|
try:
|
|
vars = self.func(self.user_code, context, *args)
|
|
except Exception, exc:
|
|
error(lineno, 'error defining "%s": %s.' % (name, exc))
|
|
for k in vars.keys():
|
|
if k not in ('header_output', 'decoder_output',
|
|
'exec_output', 'decode_block'):
|
|
del vars[k]
|
|
return GenCode(**vars)
|
|
|
|
# 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" % (input_filename, lineno, string))
|
|
|
|
# Like error(), but include a Python stack backtrace (for processing
|
|
# Python exceptions).
|
|
def error_bt(lineno, string):
|
|
traceback.print_exc()
|
|
print >> sys.stderr, "%s:%d: %s" % (input_filename, lineno, string)
|
|
sys.exit(1)
|
|
|
|
|
|
#####################################################################
|
|
#
|
|
# 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
|
|
|
|
|
|
####################
|
|
# Template objects.
|
|
#
|
|
# Template objects are format strings that allow substitution from
|
|
# the attribute spaces of other objects (e.g. InstObjParams instances).
|
|
|
|
class Template:
|
|
def __init__(self, t):
|
|
self.template = t
|
|
|
|
def subst(self, d):
|
|
# Start with the template namespace. Make a copy since we're
|
|
# going to modify it.
|
|
myDict = templateMap.copy()
|
|
# if the argument is a dictionary, we just use it.
|
|
if isinstance(d, dict):
|
|
myDict.update(d)
|
|
# if the argument is an object, we use its attribute map.
|
|
elif hasattr(d, '__dict__'):
|
|
myDict.update(d.__dict__)
|
|
else:
|
|
raise TypeError, "Template.subst() arg must be or have dictionary"
|
|
# CPU-model-specific substitutions are handled later (in GenCode).
|
|
return protect_cpu_symbols(self.template) % myDict
|
|
|
|
# Convert to string. This handles the case when a template with a
|
|
# CPU-specific term gets interpolated into another template or into
|
|
# an output block.
|
|
def __str__(self):
|
|
return expand_cpu_symbols_to_string(self.template)
|
|
|
|
#####################################################################
|
|
#
|
|
# 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):
|
|
(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):
|
|
(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):
|
|
(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):
|
|
(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):
|
|
(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):
|
|
(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):
|
|
(size, type, is_signed) = operandSizeMap[op_desc.eff_ext]
|
|
eff_type = 'uint%d_t' % size
|
|
return 'fault = xc->read(EA, (%s&)%s, %s_flags);\n' \
|
|
% (eff_type, op_desc.munged_name, op_desc.base_name)
|
|
|
|
def makeWrite(self, op_desc):
|
|
(size, type, is_signed) = operandSizeMap[op_desc.eff_ext]
|
|
eff_type = 'uint%d_t' % size
|
|
return 'fault = xc->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):
|
|
return '%s = xc->readPC() + 4;\n' % op_desc.munged_name
|
|
|
|
def makeWrite(self, op_desc):
|
|
return 'xc->setNextPC(%s);\n' % op_desc.munged_name
|
|
|
|
|
|
exportContextSymbols = ('IntRegOperandTraits', 'FloatRegOperandTraits',
|
|
'ControlRegOperandTraits', 'MemOperandTraits',
|
|
'NPCOperandTraits', 'InstObjParams', 'CodeBlock',
|
|
're', 'string')
|
|
|
|
exportContext = {}
|
|
|
|
def updateExportContext():
|
|
exportContext.update(exportDict(*exportContextSymbols))
|
|
exportContext.update(templateMap)
|
|
|
|
|
|
def exportDict(*symNames):
|
|
return dict([(s, eval(s)) for s in symNames])
|
|
|
|
|
|
#
|
|
# 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.op_decl = self.traits.makeDecl(self)
|
|
|
|
if self.is_src:
|
|
self.op_rd = self.traits.makeRead(self)
|
|
else:
|
|
self.op_rd = ''
|
|
|
|
if self.is_dest:
|
|
self.op_wb = self.traits.makeWrite(self)
|
|
else:
|
|
self.op_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.op_decl = self.operands.concatAttrStrings('op_decl')
|
|
|
|
is_mem = lambda op: op.traits.isMem()
|
|
not_mem = lambda op: not op.traits.isMem()
|
|
|
|
self.op_rd = self.operands.concatAttrStrings('op_rd')
|
|
self.op_wb = self.operands.concatAttrStrings('op_wb')
|
|
self.op_mem_rd = \
|
|
self.operands.concatSomeAttrStrings(is_mem, 'op_rd')
|
|
self.op_mem_wb = \
|
|
self.operands.concatSomeAttrStrings(is_mem, 'op_wb')
|
|
self.op_nonmem_rd = \
|
|
self.operands.concatSomeAttrStrings(not_mem, 'op_rd')
|
|
self.op_nonmem_wb = \
|
|
self.operands.concatSomeAttrStrings(not_mem, 'op_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 = ''
|
|
|
|
#######################
|
|
#
|
|
# Output file template
|
|
#
|
|
|
|
file_template = '''
|
|
/*
|
|
* Copyright (c) 2003
|
|
* The Regents of The University of Michigan
|
|
* All Rights Reserved
|
|
*
|
|
* This code is part of the M5 simulator, developed by Nathan Binkert,
|
|
* Erik Hallnor, Steve Raasch, and Steve Reinhardt, with contributions
|
|
* from Ron Dreslinski, Dave Greene, and Lisa Hsu.
|
|
*
|
|
* Permission is granted to use, copy, create derivative works and
|
|
* redistribute this software and such derivative works for any
|
|
* purpose, so long as the copyright notice above, this grant of
|
|
* permission, and the disclaimer below appear in all copies made; and
|
|
* so long as the name of The University of Michigan is not used in
|
|
* any advertising or publicity pertaining to the use or distribution
|
|
* of this software without specific, written prior authorization.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION FROM THE
|
|
* UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY PURPOSE, AND
|
|
* WITHOUT WARRANTY BY THE UNIVERSITY OF MICHIGAN OF ANY KIND, EITHER
|
|
* EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE. THE REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE
|
|
* LIABLE FOR ANY DAMAGES, INCLUDING DIRECT, SPECIAL, INDIRECT,
|
|
* INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM
|
|
* ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
|
|
* IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF SUCH
|
|
* DAMAGES.
|
|
*/
|
|
|
|
/*
|
|
* 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
|
|
'''
|
|
|
|
|
|
# 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.
|
|
def update_if_needed(file, contents):
|
|
update = False
|
|
if os.access(file, os.R_OK):
|
|
f = open(file, 'r')
|
|
old_contents = f.read()
|
|
f.close()
|
|
if contents != old_contents:
|
|
print 'Updating', file
|
|
os.remove(file) # in case it's write-protected
|
|
update = True
|
|
else:
|
|
print 'File', file, 'is unchanged'
|
|
else:
|
|
print 'Generating', file
|
|
update = True
|
|
if update:
|
|
f = open(file, 'w')
|
|
f.write(contents)
|
|
f.close()
|
|
|
|
#
|
|
# Read in and parse the ISA description.
|
|
#
|
|
def parse_isa_desc(isa_desc_file, output_dir, include_path):
|
|
# set a global var for the input filename... used in error messages
|
|
global input_filename
|
|
input_filename = isa_desc_file
|
|
|
|
# Suck the ISA description file in.
|
|
input = open(isa_desc_file)
|
|
isa_desc = input.read()
|
|
input.close()
|
|
|
|
# Parse it.
|
|
(isa_name, namespace, global_code, namespace_code) = yacc.parse(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
|
|
update_if_needed(output_dir + '/decoder.hh', file_template % vars())
|
|
|
|
# generate decoder.cc
|
|
includes = '#include "%s/decoder.hh"' % include_path
|
|
global_output = global_code.decoder_output
|
|
namespace_output = namespace_code.decoder_output
|
|
namespace_output += namespace_code.decode_block
|
|
update_if_needed(output_dir + '/decoder.cc', file_template % vars())
|
|
|
|
# generate per-cpu exec files
|
|
for cpu in CpuModel.list:
|
|
includes = '#include "%s/decoder.hh"\n' % include_path
|
|
includes += cpu.includes
|
|
global_output = global_code.exec_output[cpu.name]
|
|
namespace_output = namespace_code.exec_output[cpu.name]
|
|
update_if_needed(output_dir + '/' + cpu.filename,
|
|
file_template % vars())
|
|
|
|
# Called as script: get args from command line.
|
|
if __name__ == '__main__':
|
|
parse_isa_desc(sys.argv[1], sys.argv[2], sys.argv[3])
|