3923eec0ef
Should enable implementation of split-phase timing loads
with new memory model.
May create slight timing differences under FullCPU, as I
believe we were not handling software prefetches correctly
before when the split MemAcc/Exec model was used. I haven't
looked into this in any detail though.
arch/alpha/isa/decoder.isa:
HwLoadStore format split into separate HwLoad and
HwStore formats.
Copy instructions now fall under MiscPrefetch format.
Mem_write_result is now just write_result in store
conditionals.
arch/alpha/isa/mem.isa:
Split MemAccExecute and LoadStoreExecute templates
into separate templates for loads and stores; now
that memory operands are handled differently from
registers, it's impossible to have a single template
serve both.
Also unified the handling of "regular" prefetches
(loads to r31) and "misc" prefetches (e.g., wh64)
under the new scheme. It looks like SW prefetches
were not handled correctly in FullCPU up til now,
since we generated an execute() method for the outer
instruction but didn't generate a proper method for
MemAcc::execute() (instead getting a default no-op
method for that).
arch/alpha/isa/pal.isa:
Split HwLoadStore into separate HwLoad and HwStore
formats to select proper template (see change to
mem.isa in this changeset).
arch/isa_parser.py:
Stop trying to treat memory operands like register
operands, since we never used them in a uniform way
anyway, and it made it impossible to do split-phase
loads as needed for the new CPU model. Now there's no
more 'op_mem_rd', 'op_nonmem_rd', etc.: 'op_rd' just does
register operands, and the template code is responsible
for formulating the call to the memory system. Right now
the only thing exported by InstObjParams is a new attribute
'mem_acc_size' which gives the memory access size in bits,
though more attributes can be added if needed.
Also moved code in findOperands() method to
OperandDescriptorList.__init__(), which is where it belongs.
--HG--
extra : convert_revision : 6d53d07e0c5e828455834ded4395fa40f9146a34
1687 lines
58 KiB
Python
Executable file
1687 lines
58 KiB
Python
Executable file
#! /usr/bin/env python
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# Copyright (c) 2003-2005 The Regents of The University of Michigan
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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# The following are matched but never returned. commented out to
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# suppress PLY warning
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# newfile directive
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# 'NEWFILE',
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# endfile directive
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# 'ENDFILE'
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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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def t_NEWFILE(t):
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r'^\#\#newfile\s+"[\w/.-]*"'
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global fileNameStack
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fileNameStack.append((t.value[11:-1], t.lineno))
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t.lineno = 0
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def t_ENDFILE(t):
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r'^\#\#endfile'
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(filename, t.lineno) = fileNameStack.pop()
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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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# Protect any non-dict-substitution '%'s in a format string
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# (i.e. those not followed by '(')
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def protect_non_subst_percents(s):
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return re.sub(r'%(?!\()', '%%', s)
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|
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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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s = protect_non_subst_percents(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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|
|
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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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|
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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
|
|
# directly when seen. Note that these execute in a special variable
|
|
# context 'exportContext' to prevent the code from polluting this
|
|
# script's namespace.
|
|
def p_global_let(t):
|
|
'global_let : LET CODELIT SEMI'
|
|
updateExportContext()
|
|
try:
|
|
exec fixPythonIndentation(t[2]) in exportContext
|
|
except Exception, exc:
|
|
error(t.lineno(1),
|
|
'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
|
|
# widths (stored in operandTypeMap).
|
|
def p_def_operand_types(t):
|
|
'def_operand_types : DEF OPERAND_TYPES CODELIT SEMI'
|
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s = 'global operandTypeMap; operandTypeMap = {' + t[3] + '}'
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try:
|
|
exec s
|
|
except Exception, exc:
|
|
error(t.lineno(1),
|
|
'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):
|
|
'def_operands : DEF OPERANDS CODELIT SEMI'
|
|
s = 'global operandTraitsMap; operandTraitsMap = {' + t[3] + '}'
|
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try:
|
|
exec s
|
|
except Exception, exc:
|
|
error(t.lineno(1),
|
|
'error: %s in def operands block "%s".' % (exc, t[3]))
|
|
defineDerivedOperandVars()
|
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t[0] = GenCode() # contributes nothing to the output C++ file
|
|
|
|
# A bitfield definition looks like:
|
|
# 'def [signed] bitfield <ID> [<first>:<last>]'
|
|
# This generates a preprocessor macro in the output file.
|
|
def p_def_bitfield_0(t):
|
|
'def_bitfield : DEF opt_signed BITFIELD ID LESS INTLIT COLON INTLIT GREATER SEMI'
|
|
expr = 'bits(machInst, %2d, %2d)' % (t[6], t[8])
|
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if (t[2] == 'signed'):
|
|
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)
|
|
|
|
# alternate form for single bit: 'def [signed] bitfield <ID> [<bit>]'
|
|
def p_def_bitfield_1(t):
|
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'def_bitfield : DEF opt_signed BITFIELD ID LESS INTLIT GREATER SEMI'
|
|
expr = 'bits(machInst, %2d, %2d)' % (t[6], t[6])
|
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if (t[2] == 'signed'):
|
|
expr = 'sext<%d>(%s)' % (1, expr)
|
|
hash_define = '#undef %s\n#define %s\t%s\n' % (t[4], t[4], expr)
|
|
t[0] = GenCode(header_output = hash_define)
|
|
|
|
def p_opt_signed_0(t):
|
|
'opt_signed : SIGNED'
|
|
t[0] = t[1]
|
|
|
|
def p_opt_signed_1(t):
|
|
'opt_signed : empty'
|
|
t[0] = ''
|
|
|
|
# Global map variable to hold templates
|
|
templateMap = {}
|
|
|
|
def p_def_template(t):
|
|
'def_template : DEF TEMPLATE ID CODELIT SEMI'
|
|
templateMap[t[3]] = Template(t[4])
|
|
t[0] = GenCode()
|
|
|
|
# An instruction format definition looks like
|
|
# "def format <fmt>(<params>) {{...}};"
|
|
def p_def_format(t):
|
|
'def_format : DEF FORMAT ID LPAREN param_list RPAREN CODELIT SEMI'
|
|
(id, params, code) = (t[3], t[5], t[7])
|
|
defFormat(id, params, code, t.lineno(1))
|
|
t[0] = GenCode()
|
|
|
|
# The formal parameter list for an instruction format is a possibly
|
|
# empty list of comma-separated parameters.
|
|
def p_param_list_0(t):
|
|
'param_list : empty'
|
|
t[0] = [ ]
|
|
|
|
def p_param_list_1(t):
|
|
'param_list : param'
|
|
t[0] = [t[1]]
|
|
|
|
def p_param_list_2(t):
|
|
'param_list : param_list COMMA param'
|
|
t[0] = t[1]
|
|
t[0].append(t[3])
|
|
|
|
# Each formal parameter is either an identifier or an identifier
|
|
# preceded by an asterisk. As in Python, the latter (if present) gets
|
|
# a tuple containing all the excess positional arguments, allowing
|
|
# varargs functions.
|
|
def p_param_0(t):
|
|
'param : ID'
|
|
t[0] = t[1]
|
|
|
|
def p_param_1(t):
|
|
'param : ASTERISK ID'
|
|
# just concatenate them: '*ID'
|
|
t[0] = t[1] + t[2]
|
|
|
|
# End of format definition-related rules.
|
|
##############
|
|
|
|
#
|
|
# A decode block looks like:
|
|
# decode <field1> [, <field2>]* [default <inst>] { ... }
|
|
#
|
|
def p_decode_block(t):
|
|
'decode_block : DECODE ID opt_default LBRACE decode_stmt_list RBRACE'
|
|
default_defaults = defaultStack.pop()
|
|
codeObj = t[5]
|
|
# use the "default defaults" only if there was no explicit
|
|
# default statement in decode_stmt_list
|
|
if not codeObj.has_decode_default:
|
|
codeObj += default_defaults
|
|
codeObj.wrap_decode_block('switch (%s) {\n' % t[2], '}\n')
|
|
t[0] = codeObj
|
|
|
|
# The opt_default statement serves only to push the "default defaults"
|
|
# onto defaultStack. This value will be used by nested decode blocks,
|
|
# and used and popped off when the current decode_block is processed
|
|
# (in p_decode_block() above).
|
|
def p_opt_default_0(t):
|
|
'opt_default : empty'
|
|
# no default specified: reuse the one currently at the top of the stack
|
|
defaultStack.push(defaultStack.top())
|
|
# no meaningful value returned
|
|
t[0] = None
|
|
|
|
def p_opt_default_1(t):
|
|
'opt_default : DEFAULT inst'
|
|
# push the new default
|
|
codeObj = t[2]
|
|
codeObj.wrap_decode_block('\ndefault:\n', 'break;\n')
|
|
defaultStack.push(codeObj)
|
|
# no meaningful value returned
|
|
t[0] = None
|
|
|
|
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'
|
|
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):
|
|
'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.hh"',
|
|
{ 'CPU_exec_context': 'SimpleCPU' })
|
|
CpuModel('FastCPU', 'fast_cpu_exec.cc',
|
|
'#include "cpu/fast/cpu.hh"',
|
|
{ 'CPU_exec_context': 'FastCPU' })
|
|
CpuModel('FullCPU', 'full_cpu_exec.cc',
|
|
'#include "encumbered/cpu/full/dyn_inst.hh"',
|
|
{ 'CPU_exec_context': 'DynInst' })
|
|
CpuModel('AlphaFullCPU', 'alpha_o3_exec.cc',
|
|
'#include "cpu/o3/alpha_dyn_inst.hh"',
|
|
{ 'CPU_exec_context': 'AlphaDynInst<AlphaSimpleImpl>' })
|
|
|
|
# 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). Simply wraps a list to give more
|
|
# stack-like syntax and enable initialization with an argument list
|
|
# (as opposed to an argument that's a list).
|
|
|
|
class Stack(list):
|
|
def __init__(self, *items):
|
|
list.__init__(self, items)
|
|
|
|
def push(self, item):
|
|
self.append(item);
|
|
|
|
def top(self):
|
|
return self[-1]
|
|
|
|
# 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. This function should be called when errors due
|
|
# to user input are detected (as opposed to parser bugs).
|
|
def error(lineno, string):
|
|
spaces = ""
|
|
for (filename, line) in fileNameStack[0:-1]:
|
|
print spaces + "In file included from " + filename
|
|
spaces += " "
|
|
# Uncomment the following line to get a Python stack backtrace for
|
|
# these errors too. Can be handy when trying to debug the parser.
|
|
# traceback.print_exc()
|
|
sys.exit(spaces + "%s:%d: %s" % (fileNameStack[-1][0], lineno, string))
|
|
|
|
# Like error(), but include a Python stack backtrace (for processing
|
|
# Python exceptions). This function should be called for errors that
|
|
# appear to be bugs in the parser itself.
|
|
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"
|
|
# Protect non-Python-dict substitutions (e.g. if there's a printf
|
|
# in the templated C++ code)
|
|
template = protect_non_subst_percents(self.template)
|
|
# CPU-model-specific substitutions are handled later (in GenCode).
|
|
template = protect_cpu_symbols(template)
|
|
return 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.base_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(this, %d);\n' % \
|
|
(op_desc.base_name, op_desc.src_reg_idx)
|
|
else:
|
|
return '%s = bits(xc->readIntReg(this, %d), %d, 0);\n' % \
|
|
(op_desc.base_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.base_name)
|
|
else:
|
|
final_val = op_desc.base_name
|
|
wb = '''
|
|
{
|
|
%s final_val = %s;
|
|
xc->setIntReg(this, %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(this, %d)' % \
|
|
(func, op_desc.src_reg_idx)
|
|
if bit_select:
|
|
return '%s = bits(%s, %d, 0);\n' % \
|
|
(op_desc.base_name, base, size-1)
|
|
else:
|
|
return '%s = %s;\n' % (op_desc.base_name, base)
|
|
|
|
def makeWrite(self, op_desc):
|
|
(size, type, is_signed) = operandSizeMap[op_desc.eff_ext]
|
|
final_val = op_desc.base_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.base_name)
|
|
wb = '''
|
|
{
|
|
%s final_val = %s;
|
|
xc->%s(this, %d, 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.base_name, base)
|
|
else:
|
|
return '%s = bits(%s, %d, 0);\n' % \
|
|
(op_desc.base_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.base_name)
|
|
wb += 'if (traceData) { traceData->setData(%s); }' % \
|
|
op_desc.base_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.base_name)
|
|
return c
|
|
|
|
def makeRead(self, op_desc):
|
|
return ''
|
|
|
|
def makeWrite(self, op_desc):
|
|
return ''
|
|
|
|
# Return the memory access size *in bits*, suitable for
|
|
# forming a type via "uint%d_t". Divide by 8 if you want bytes.
|
|
def makeAccSize(self, op_desc):
|
|
(size, type, is_signed) = operandSizeMap[op_desc.eff_ext]
|
|
return size
|
|
|
|
class NPCOperandTraits(OperandTraits):
|
|
def makeConstructor(self, op_desc):
|
|
return ''
|
|
|
|
def makeRead(self, op_desc):
|
|
return '%s = xc->readPC() + 4;\n' % op_desc.base_name
|
|
|
|
def makeWrite(self, op_desc):
|
|
return 'xc->setNextPC(%s);\n' % op_desc.base_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.
|
|
if ext:
|
|
self.eff_ext = ext
|
|
else:
|
|
self.eff_ext = self.traits.dflt_ext
|
|
|
|
# note that mem_acc_size is undefined for non-mem operands...
|
|
# template must be careful not to use it if it doesn't apply.
|
|
if self.traits.isMem():
|
|
self.mem_acc_size = self.traits.makeAccSize(self)
|
|
|
|
# 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:
|
|
|
|
# Find all the operands in the given code block. Returns an operand
|
|
# descriptor list (instance of class OperandDescriptorList).
|
|
def __init__(self, code):
|
|
self.items = []
|
|
self.bases = {}
|
|
# delete comments so we don't 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 = self.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)
|
|
self.append(op_desc)
|
|
# start next search after end of current match
|
|
next_pos = match.end()
|
|
self.sort()
|
|
# enumerate source & dest register operands... used in building
|
|
# constructor later
|
|
self.numSrcRegs = 0
|
|
self.numDestRegs = 0
|
|
self.numFPDestRegs = 0
|
|
self.numIntDestRegs = 0
|
|
self.memOperand = None
|
|
for op_desc in self.items:
|
|
if op_desc.traits.isReg():
|
|
if op_desc.is_src:
|
|
op_desc.src_reg_idx = self.numSrcRegs
|
|
self.numSrcRegs += 1
|
|
if op_desc.is_dest:
|
|
op_desc.dest_reg_idx = self.numDestRegs
|
|
self.numDestRegs += 1
|
|
if op_desc.traits.isFloatReg():
|
|
self.numFPDestRegs += 1
|
|
elif op_desc.traits.isIntReg():
|
|
self.numIntDestRegs += 1
|
|
elif op_desc.traits.isMem():
|
|
if self.memOperand:
|
|
error(0, "Code block has more than one memory operand.")
|
|
self.memOperand = op_desc
|
|
# now make a final pass to finalize op_desc fields that may depend
|
|
# on the register enumeration
|
|
for op_desc in self.items:
|
|
op_desc.finalize()
|
|
|
|
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)
|
|
|
|
# Munge operand names in code string to make legal C++ variable names.
|
|
# This means getting rid of the type extension if any.
|
|
# (Will match base_name attribute of OperandDescriptor object.)
|
|
def substMungedOpNames(code):
|
|
return operandsWithExtRE.sub(r'\1', 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 = OperandDescriptorList(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')
|
|
|
|
self.op_rd = self.operands.concatAttrStrings('op_rd')
|
|
self.op_wb = self.operands.concatAttrStrings('op_wb')
|
|
|
|
self.flags = self.operands.concatAttrLists('flags')
|
|
|
|
if self.operands.memOperand:
|
|
self.mem_acc_size = self.operands.memOperand.mem_acc_size
|
|
|
|
# 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 = 'MemWriteOp'
|
|
elif 'IsLoad' in self.flags or 'IsPrefetch' in self.flags:
|
|
self.op_class = 'MemReadOp'
|
|
elif 'IsFloating' in self.flags:
|
|
self.op_class = 'FloatAddOp'
|
|
else:
|
|
self.op_class = 'IntAluOp'
|
|
|
|
# Assume all instruction flags are of the form 'IsFoo'
|
|
instFlagRE = re.compile(r'Is.*')
|
|
|
|
# OpClass constants end in 'Op' except No_OpClass
|
|
opClassRE = re.compile(r'.*Op|No_OpClass')
|
|
|
|
class InstObjParams:
|
|
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 = '''
|
|
/*
|
|
* 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()
|
|
|
|
# This regular expression matches include directives
|
|
includeRE = re.compile(r'^\s*##include\s+"(?P<filename>[\w/.-]*)".*$',
|
|
re.MULTILINE)
|
|
|
|
def preprocess_isa_desc(isa_desc):
|
|
# Find any includes and include them
|
|
pos = 0
|
|
while 1:
|
|
m = includeRE.search(isa_desc, pos)
|
|
if not m:
|
|
break
|
|
filename = m.group('filename')
|
|
print 'Including file "%s"' % filename
|
|
try:
|
|
isa_desc = isa_desc[:m.start()] + \
|
|
'##newfile "' + filename + '"\n' + \
|
|
open(filename).read() + \
|
|
'##endfile\n' + \
|
|
isa_desc[m.end():]
|
|
except IOError:
|
|
error(0, 'Error including file "%s"' % (filename))
|
|
pos = m.start()
|
|
return isa_desc
|
|
|
|
#
|
|
# 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
|
|
global fileNameStack
|
|
fileNameStack = [(input_filename, 1)]
|
|
|
|
# Suck the ISA description file in.
|
|
input = open(isa_desc_file)
|
|
isa_desc = input.read()
|
|
input.close()
|
|
|
|
# Perform Preprocessing
|
|
isa_desc = preprocess_isa_desc(isa_desc)
|
|
|
|
# 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])
|