1 # Copyright (c) 2014 ARM Limited
4 # The license below extends only to copyright in the software and shall
5 # not be construed as granting a license to any other intellectual
6 # property including but not limited to intellectual property relating
7 # to a hardware implementation of the functionality of the software
8 # licensed hereunder. You may use the software subject to the license
9 # terms below provided that you ensure that this notice is replicated
10 # unmodified and in its entirety in all distributions of the software,
11 # modified or unmodified, in source code or in binary form.
13 # Copyright (c) 2003-2005 The Regents of The University of Michigan
14 # Copyright (c) 2013,2015 Advanced Micro Devices, Inc.
15 # All rights reserved.
17 # Redistribution and use in source and binary forms, with or without
18 # modification, are permitted provided that the following conditions are
19 # met: redistributions of source code must retain the above copyright
20 # notice, this list of conditions and the following disclaimer;
21 # redistributions in binary form must reproduce the above copyright
22 # notice, this list of conditions and the following disclaimer in the
23 # documentation and/or other materials provided with the distribution;
24 # neither the name of the copyright holders nor the names of its
25 # contributors may be used to endorse or promote products derived from
26 # this software without specific prior written permission.
28 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 # Authors: Steve Reinhardt
42 from __future__
import with_statement
47 import inspect
, traceback
51 from m5
.util
.grammar
import Grammar
59 # Indent every line in string 's' by two spaces
60 # (except preprocessor directives).
61 # Used to make nested code blocks look pretty.
64 return re
.sub(r
'(?m)^(?!#)', ' ', s
)
67 # Munge a somewhat arbitrarily formatted piece of Python code
68 # (e.g. from a format 'let' block) into something whose indentation
69 # will get by the Python parser.
71 # The two keys here are that Python will give a syntax error if
72 # there's any whitespace at the beginning of the first line, and that
73 # all lines at the same lexical nesting level must have identical
74 # indentation. Unfortunately the way code literals work, an entire
75 # let block tends to have some initial indentation. Rather than
76 # trying to figure out what that is and strip it off, we prepend 'if
77 # 1:' to make the let code the nested block inside the if (and have
78 # the parser automatically deal with the indentation for us).
80 # We don't want to do this if (1) the code block is empty or (2) the
81 # first line of the block doesn't have any whitespace at the front.
83 def fixPythonIndentation(s
):
84 # get rid of blank lines first
85 s
= re
.sub(r
'(?m)^\s*\n', '', s
);
86 if (s
!= '' and re
.match(r
'[ \t]', s
[0])):
90 class ISAParserError(Exception):
91 """Exception class for parser errors"""
92 def __init__(self
, first
, second
=None):
104 raise ISAParserError(*args
)
109 # Template objects are format strings that allow substitution from
110 # the attribute spaces of other objects (e.g. InstObjParams instances).
112 labelRE
= re
.compile(r
'(?<!%)%\(([^\)]+)\)[sd]')
114 class Template(object):
115 def __init__(self
, parser
, t
):
122 # Protect non-Python-dict substitutions (e.g. if there's a printf
123 # in the templated C++ code)
124 template
= self
.parser
.protectNonSubstPercents(self
.template
)
125 # CPU-model-specific substitutions are handled later (in GenCode).
126 template
= self
.parser
.protectCpuSymbols(template
)
128 # Build a dict ('myDict') to use for the template substitution.
129 # Start with the template namespace. Make a copy since we're
130 # going to modify it.
131 myDict
= self
.parser
.templateMap
.copy()
133 if isinstance(d
, InstObjParams
):
134 # If we're dealing with an InstObjParams object, we need
135 # to be a little more sophisticated. The instruction-wide
136 # parameters are already formed, but the parameters which
137 # are only function wide still need to be generated.
140 myDict
.update(d
.__dict
__)
141 # The "operands" and "snippets" attributes of the InstObjParams
142 # objects are for internal use and not substitution.
143 del myDict
['operands']
144 del myDict
['snippets']
146 snippetLabels
= [l
for l
in labelRE
.findall(template
)
147 if d
.snippets
.has_key(l
)]
149 snippets
= dict([(s
, self
.parser
.mungeSnippet(d
.snippets
[s
]))
150 for s
in snippetLabels
])
152 myDict
.update(snippets
)
154 compositeCode
= ' '.join(map(str, snippets
.values()))
156 # Add in template itself in case it references any
157 # operands explicitly (like Mem)
158 compositeCode
+= ' ' + template
160 operands
= SubOperandList(self
.parser
, compositeCode
, d
.operands
)
162 myDict
['op_decl'] = operands
.concatAttrStrings('op_decl')
163 if operands
.readPC
or operands
.setPC
:
164 myDict
['op_decl'] += 'TheISA::PCState __parserAutoPCState;\n'
166 # In case there are predicated register reads and write, declare
167 # the variables for register indicies. It is being assumed that
168 # all the operands in the OperandList are also in the
169 # SubOperandList and in the same order. Otherwise, it is
170 # expected that predication would not be used for the operands.
171 if operands
.predRead
:
172 myDict
['op_decl'] += 'uint8_t _sourceIndex = 0;\n'
173 if operands
.predWrite
:
174 myDict
['op_decl'] += 'uint8_t M5_VAR_USED _destIndex = 0;\n'
176 is_src
= lambda op
: op
.is_src
177 is_dest
= lambda op
: op
.is_dest
179 myDict
['op_src_decl'] = \
180 operands
.concatSomeAttrStrings(is_src
, 'op_src_decl')
181 myDict
['op_dest_decl'] = \
182 operands
.concatSomeAttrStrings(is_dest
, 'op_dest_decl')
184 myDict
['op_src_decl'] += \
185 'TheISA::PCState __parserAutoPCState;\n'
187 myDict
['op_dest_decl'] += \
188 'TheISA::PCState __parserAutoPCState;\n'
190 myDict
['op_rd'] = operands
.concatAttrStrings('op_rd')
192 myDict
['op_rd'] = '__parserAutoPCState = xc->pcState();\n' + \
195 # Compose the op_wb string. If we're going to write back the
196 # PC state because we changed some of its elements, we'll need to
197 # do that as early as possible. That allows later uncoordinated
198 # modifications to the PC to layer appropriately.
199 reordered
= list(operands
.items
)
202 pcWbStr
= 'xc->pcState(__parserAutoPCState);\n'
203 for op_desc
in reordered
:
204 if op_desc
.isPCPart() and op_desc
.is_dest
:
205 op_wb_str
= op_desc
.op_wb
+ pcWbStr
+ op_wb_str
208 op_wb_str
= op_desc
.op_wb
+ op_wb_str
209 myDict
['op_wb'] = op_wb_str
211 elif isinstance(d
, dict):
212 # if the argument is a dictionary, we just use it.
214 elif hasattr(d
, '__dict__'):
215 # if the argument is an object, we use its attribute map.
216 myDict
.update(d
.__dict
__)
218 raise TypeError, "Template.subst() arg must be or have dictionary"
219 return template
% myDict
221 # Convert to string. This handles the case when a template with a
222 # CPU-specific term gets interpolated into another template or into
225 return self
.parser
.expandCpuSymbolsToString(self
.template
)
230 # A format object encapsulates an instruction format. It must provide
231 # a defineInst() method that generates the code for an instruction
234 class Format(object):
235 def __init__(self
, id, params
, code
):
238 label
= 'def format ' + id
239 self
.user_code
= compile(fixPythonIndentation(code
), label
, 'exec')
240 param_list
= string
.join(params
, ", ")
241 f
= '''def defInst(_code, _context, %s):
242 my_locals = vars().copy()
243 exec _code in _context, my_locals
244 return my_locals\n''' % param_list
245 c
= compile(f
, label
+ ' wrapper', 'exec')
249 def defineInst(self
, parser
, name
, args
, lineno
):
250 parser
.updateExportContext()
251 context
= parser
.exportContext
.copy()
253 Name
= name
[0].upper()
256 context
.update({ 'name' : name
, 'Name' : Name
})
258 vars = self
.func(self
.user_code
, context
, *args
[0], **args
[1])
259 except Exception, exc
:
262 error(lineno
, 'error defining "%s": %s.' % (name
, exc
))
263 for k
in vars.keys():
264 if k
not in ('header_output', 'decoder_output',
265 'exec_output', 'decode_block'):
267 return GenCode(parser
, **vars)
269 # Special null format to catch an implicit-format instruction
270 # definition outside of any format block.
271 class NoFormat(object):
273 self
.defaultInst
= ''
275 def defineInst(self
, parser
, name
, args
, lineno
):
277 'instruction definition "%s" with no active format!' % name
)
282 # The GenCode class encapsulates generated code destined for various
283 # output files. The header_output and decoder_output attributes are
284 # strings containing code destined for decoder.hh and decoder.cc
285 # respectively. The decode_block attribute contains code to be
286 # incorporated in the decode function itself (that will also end up in
287 # decoder.cc). The exec_output attribute is a dictionary with a key
288 # for each CPU model name; the value associated with a particular key
289 # is the string of code for that CPU model's exec.cc file. The
290 # has_decode_default attribute is used in the decode block to allow
291 # explicit default clauses to override default default clauses.
293 class GenCode(object):
294 # Constructor. At this point we substitute out all CPU-specific
295 # symbols. For the exec output, these go into the per-model
296 # dictionary. For all other output types they get collapsed into
298 def __init__(self
, parser
,
299 header_output
= '', decoder_output
= '', exec_output
= '',
300 decode_block
= '', has_decode_default
= False):
302 self
.header_output
= parser
.expandCpuSymbolsToString(header_output
)
303 self
.decoder_output
= parser
.expandCpuSymbolsToString(decoder_output
)
304 self
.exec_output
= exec_output
305 self
.decode_block
= decode_block
306 self
.has_decode_default
= has_decode_default
308 # Write these code chunks out to the filesystem. They will be properly
309 # interwoven by the write_top_level_files().
311 if self
.header_output
:
312 self
.parser
.get_file('header').write(self
.header_output
)
313 if self
.decoder_output
:
314 self
.parser
.get_file('decoder').write(self
.decoder_output
)
316 self
.parser
.get_file('exec').write(self
.exec_output
)
317 if self
.decode_block
:
318 self
.parser
.get_file('decode_block').write(self
.decode_block
)
320 # Override '+' operator: generate a new GenCode object that
321 # concatenates all the individual strings in the operands.
322 def __add__(self
, other
):
323 return GenCode(self
.parser
,
324 self
.header_output
+ other
.header_output
,
325 self
.decoder_output
+ other
.decoder_output
,
326 self
.exec_output
+ other
.exec_output
,
327 self
.decode_block
+ other
.decode_block
,
328 self
.has_decode_default
or other
.has_decode_default
)
330 # Prepend a string (typically a comment) to all the strings.
331 def prepend_all(self
, pre
):
332 self
.header_output
= pre
+ self
.header_output
333 self
.decoder_output
= pre
+ self
.decoder_output
334 self
.decode_block
= pre
+ self
.decode_block
335 self
.exec_output
= pre
+ self
.exec_output
337 # Wrap the decode block in a pair of strings (e.g., 'case foo:'
338 # and 'break;'). Used to build the big nested switch statement.
339 def wrap_decode_block(self
, pre
, post
= ''):
340 self
.decode_block
= pre
+ indent(self
.decode_block
) + post
342 #####################################################################
344 # Bitfield Operator Support
346 #####################################################################
348 bitOp1ArgRE
= re
.compile(r
'<\s*(\w+)\s*:\s*>')
350 bitOpWordRE
= re
.compile(r
'(?<![\w\.])([\w\.]+)<\s*(\w+)\s*:\s*(\w+)\s*>')
351 bitOpExprRE
= re
.compile(r
'\)<\s*(\w+)\s*:\s*(\w+)\s*>')
353 def substBitOps(code
):
354 # first convert single-bit selectors to two-index form
355 # i.e., <n> --> <n:n>
356 code
= bitOp1ArgRE
.sub(r
'<\1:\1>', code
)
357 # simple case: selector applied to ID (name)
358 # i.e., foo<a:b> --> bits(foo, a, b)
359 code
= bitOpWordRE
.sub(r
'bits(\1, \2, \3)', code
)
360 # if selector is applied to expression (ending in ')'),
361 # we need to search backward for matching '('
362 match
= bitOpExprRE
.search(code
)
364 exprEnd
= match
.start()
368 if code
[here
] == '(':
370 elif code
[here
] == ')':
374 sys
.exit("Didn't find '('!")
376 newExpr
= r
'bits(%s, %s, %s)' % (code
[exprStart
:exprEnd
+1],
377 match
.group(1), match
.group(2))
378 code
= code
[:exprStart
] + newExpr
+ code
[match
.end():]
379 match
= bitOpExprRE
.search(code
)
383 #####################################################################
387 # The remaining code is the support for automatically extracting
388 # instruction characteristics from pseudocode.
390 #####################################################################
392 # Force the argument to be a list. Useful for flags, where a caller
393 # can specify a singleton flag or a list of flags. Also usful for
394 # converting tuples to lists so they can be modified.
396 if isinstance(arg
, list):
398 elif isinstance(arg
, tuple):
405 class Operand(object):
406 '''Base class for operand descriptors. An instance of this class
407 (or actually a class derived from this one) represents a specific
408 operand for a code block (e.g, "Rc.sq" as a dest). Intermediate
409 derived classes encapsulates the traits of a particular operand
410 type (e.g., "32-bit integer register").'''
412 def buildReadCode(self
, func
= None):
413 subst_dict
= {"name": self
.base_name
,
415 "reg_idx": self
.reg_spec
,
417 if hasattr(self
, 'src_reg_idx'):
418 subst_dict
['op_idx'] = self
.src_reg_idx
419 code
= self
.read_code
% subst_dict
420 return '%s = %s;\n' % (self
.base_name
, code
)
422 def buildWriteCode(self
, func
= None):
423 subst_dict
= {"name": self
.base_name
,
425 "reg_idx": self
.reg_spec
,
427 "final_val": self
.base_name
}
428 if hasattr(self
, 'dest_reg_idx'):
429 subst_dict
['op_idx'] = self
.dest_reg_idx
430 code
= self
.write_code
% subst_dict
435 if (traceData) { traceData->setData(final_val); }
436 }''' % (self
.dflt_ctype
, self
.base_name
, code
)
438 def __init__(self
, parser
, full_name
, ext
, is_src
, is_dest
):
439 self
.full_name
= full_name
442 self
.is_dest
= is_dest
443 # The 'effective extension' (eff_ext) is either the actual
444 # extension, if one was explicitly provided, or the default.
447 elif hasattr(self
, 'dflt_ext'):
448 self
.eff_ext
= self
.dflt_ext
450 if hasattr(self
, 'eff_ext'):
451 self
.ctype
= parser
.operandTypeMap
[self
.eff_ext
]
453 # Finalize additional fields (primarily code fields). This step
454 # is done separately since some of these fields may depend on the
455 # register index enumeration that hasn't been performed yet at the
456 # time of __init__(). The register index enumeration is affected
457 # by predicated register reads/writes. Hence, we forward the flags
458 # that indicate whether or not predication is in use.
459 def finalize(self
, predRead
, predWrite
):
460 self
.flags
= self
.getFlags()
461 self
.constructor
= self
.makeConstructor(predRead
, predWrite
)
462 self
.op_decl
= self
.makeDecl()
465 self
.op_rd
= self
.makeRead(predRead
)
466 self
.op_src_decl
= self
.makeDecl()
469 self
.op_src_decl
= ''
472 self
.op_wb
= self
.makeWrite(predWrite
)
473 self
.op_dest_decl
= self
.makeDecl()
476 self
.op_dest_decl
= ''
484 def isFloatReg(self
):
493 def isControlReg(self
):
500 return self
.isPCState() and self
.reg_spec
502 def hasReadPred(self
):
503 return self
.read_predicate
!= None
505 def hasWritePred(self
):
506 return self
.write_predicate
!= None
509 # note the empty slice '[:]' gives us a copy of self.flags[0]
510 # instead of a reference to it
511 my_flags
= self
.flags
[0][:]
513 my_flags
+= self
.flags
[1]
515 my_flags
+= self
.flags
[2]
519 # Note that initializations in the declarations are solely
520 # to avoid 'uninitialized variable' errors from the compiler.
521 return self
.ctype
+ ' ' + self
.base_name
+ ' = 0;\n';
523 class IntRegOperand(Operand
):
530 def makeConstructor(self
, predRead
, predWrite
):
535 c_src
= '\n\t_srcRegIdx[_numSrcRegs++] = %s;' % (self
.reg_spec
)
536 if self
.hasReadPred():
537 c_src
= '\n\tif (%s) {%s\n\t}' % \
538 (self
.read_predicate
, c_src
)
541 c_dest
= '\n\t_destRegIdx[_numDestRegs++] = %s;' % \
543 c_dest
+= '\n\t_numIntDestRegs++;'
544 if self
.hasWritePred():
545 c_dest
= '\n\tif (%s) {%s\n\t}' % \
546 (self
.write_predicate
, c_dest
)
548 return c_src
+ c_dest
550 def makeRead(self
, predRead
):
551 if (self
.ctype
== 'float' or self
.ctype
== 'double'):
552 error('Attempt to read integer register as FP')
553 if self
.read_code
!= None:
554 return self
.buildReadCode('readIntRegOperand')
558 int_reg_val
= 'xc->readIntRegOperand(this, _sourceIndex++)'
559 if self
.hasReadPred():
560 int_reg_val
= '(%s) ? %s : 0' % \
561 (self
.read_predicate
, int_reg_val
)
563 int_reg_val
= 'xc->readIntRegOperand(this, %d)' % self
.src_reg_idx
565 return '%s = %s;\n' % (self
.base_name
, int_reg_val
)
567 def makeWrite(self
, predWrite
):
568 if (self
.ctype
== 'float' or self
.ctype
== 'double'):
569 error('Attempt to write integer register as FP')
570 if self
.write_code
!= None:
571 return self
.buildWriteCode('setIntRegOperand')
575 if self
.hasWritePred():
576 wp
= self
.write_predicate
578 wcond
= 'if (%s)' % (wp
)
579 windex
= '_destIndex++'
582 windex
= '%d' % self
.dest_reg_idx
588 xc->setIntRegOperand(this, %s, final_val);\n
589 if (traceData) { traceData->setData(final_val); }
590 }''' % (wcond
, self
.ctype
, self
.base_name
, windex
)
594 class FloatRegOperand(Operand
):
598 def isFloatReg(self
):
601 def makeConstructor(self
, predRead
, predWrite
):
606 c_src
= '\n\t_srcRegIdx[_numSrcRegs++] = %s + FP_Reg_Base;' % \
611 '\n\t_destRegIdx[_numDestRegs++] = %s + FP_Reg_Base;' % \
613 c_dest
+= '\n\t_numFPDestRegs++;'
615 return c_src
+ c_dest
617 def makeRead(self
, predRead
):
619 if (self
.ctype
== 'float' or self
.ctype
== 'double'):
620 func
= 'readFloatRegOperand'
622 func
= 'readFloatRegOperandBits'
623 if self
.read_code
!= None:
624 return self
.buildReadCode(func
)
627 rindex
= '_sourceIndex++'
629 rindex
= '%d' % self
.src_reg_idx
631 return '%s = xc->%s(this, %s);\n' % \
632 (self
.base_name
, func
, rindex
)
634 def makeWrite(self
, predWrite
):
635 if (self
.ctype
== 'float' or self
.ctype
== 'double'):
636 func
= 'setFloatRegOperand'
638 func
= 'setFloatRegOperandBits'
639 if self
.write_code
!= None:
640 return self
.buildWriteCode(func
)
645 wp
= '%d' % self
.dest_reg_idx
646 wp
= 'xc->%s(this, %s, final_val);' % (func
, wp
)
652 if (traceData) { traceData->setData(final_val); }
653 }''' % (self
.ctype
, self
.base_name
, wp
)
656 class CCRegOperand(Operand
):
663 def makeConstructor(self
, predRead
, predWrite
):
668 c_src
= '\n\t_srcRegIdx[_numSrcRegs++] = %s + CC_Reg_Base;' % \
670 if self
.hasReadPred():
671 c_src
= '\n\tif (%s) {%s\n\t}' % \
672 (self
.read_predicate
, c_src
)
676 '\n\t_destRegIdx[_numDestRegs++] = %s + CC_Reg_Base;' % \
678 c_dest
+= '\n\t_numCCDestRegs++;'
679 if self
.hasWritePred():
680 c_dest
= '\n\tif (%s) {%s\n\t}' % \
681 (self
.write_predicate
, c_dest
)
683 return c_src
+ c_dest
685 def makeRead(self
, predRead
):
686 if (self
.ctype
== 'float' or self
.ctype
== 'double'):
687 error('Attempt to read condition-code register as FP')
688 if self
.read_code
!= None:
689 return self
.buildReadCode('readCCRegOperand')
693 int_reg_val
= 'xc->readCCRegOperand(this, _sourceIndex++)'
694 if self
.hasReadPred():
695 int_reg_val
= '(%s) ? %s : 0' % \
696 (self
.read_predicate
, int_reg_val
)
698 int_reg_val
= 'xc->readCCRegOperand(this, %d)' % self
.src_reg_idx
700 return '%s = %s;\n' % (self
.base_name
, int_reg_val
)
702 def makeWrite(self
, predWrite
):
703 if (self
.ctype
== 'float' or self
.ctype
== 'double'):
704 error('Attempt to write condition-code register as FP')
705 if self
.write_code
!= None:
706 return self
.buildWriteCode('setCCRegOperand')
710 if self
.hasWritePred():
711 wp
= self
.write_predicate
713 wcond
= 'if (%s)' % (wp
)
714 windex
= '_destIndex++'
717 windex
= '%d' % self
.dest_reg_idx
723 xc->setCCRegOperand(this, %s, final_val);\n
724 if (traceData) { traceData->setData(final_val); }
725 }''' % (wcond
, self
.ctype
, self
.base_name
, windex
)
729 class ControlRegOperand(Operand
):
733 def isControlReg(self
):
736 def makeConstructor(self
, predRead
, predWrite
):
742 '\n\t_srcRegIdx[_numSrcRegs++] = %s + Misc_Reg_Base;' % \
747 '\n\t_destRegIdx[_numDestRegs++] = %s + Misc_Reg_Base;' % \
750 return c_src
+ c_dest
752 def makeRead(self
, predRead
):
754 if (self
.ctype
== 'float' or self
.ctype
== 'double'):
755 error('Attempt to read control register as FP')
756 if self
.read_code
!= None:
757 return self
.buildReadCode('readMiscRegOperand')
760 rindex
= '_sourceIndex++'
762 rindex
= '%d' % self
.src_reg_idx
764 return '%s = xc->readMiscRegOperand(this, %s);\n' % \
765 (self
.base_name
, rindex
)
767 def makeWrite(self
, predWrite
):
768 if (self
.ctype
== 'float' or self
.ctype
== 'double'):
769 error('Attempt to write control register as FP')
770 if self
.write_code
!= None:
771 return self
.buildWriteCode('setMiscRegOperand')
774 windex
= '_destIndex++'
776 windex
= '%d' % self
.dest_reg_idx
778 wb
= 'xc->setMiscRegOperand(this, %s, %s);\n' % \
779 (windex
, self
.base_name
)
780 wb
+= 'if (traceData) { traceData->setData(%s); }' % \
785 class MemOperand(Operand
):
789 def makeConstructor(self
, predRead
, predWrite
):
793 # Declare memory data variable.
794 return '%s %s;\n' % (self
.ctype
, self
.base_name
)
796 def makeRead(self
, predRead
):
797 if self
.read_code
!= None:
798 return self
.buildReadCode()
801 def makeWrite(self
, predWrite
):
802 if self
.write_code
!= None:
803 return self
.buildWriteCode()
806 class PCStateOperand(Operand
):
807 def makeConstructor(self
, predRead
, predWrite
):
810 def makeRead(self
, predRead
):
812 # A component of the PC state.
813 return '%s = __parserAutoPCState.%s();\n' % \
814 (self
.base_name
, self
.reg_spec
)
816 # The whole PC state itself.
817 return '%s = xc->pcState();\n' % self
.base_name
819 def makeWrite(self
, predWrite
):
821 # A component of the PC state.
822 return '__parserAutoPCState.%s(%s);\n' % \
823 (self
.reg_spec
, self
.base_name
)
825 # The whole PC state itself.
826 return 'xc->pcState(%s);\n' % self
.base_name
829 ctype
= 'TheISA::PCState'
832 # Note that initializations in the declarations are solely
833 # to avoid 'uninitialized variable' errors from the compiler.
834 return '%s %s = 0;\n' % (ctype
, self
.base_name
)
839 class OperandList(object):
840 '''Find all the operands in the given code block. Returns an operand
841 descriptor list (instance of class OperandList).'''
842 def __init__(self
, parser
, code
):
845 # delete strings and comments so we don't match on operands inside
846 for regEx
in (stringRE
, commentRE
):
847 code
= regEx
.sub('', code
)
848 # search for operands
851 match
= parser
.operandsRE
.search(code
, next_pos
)
853 # no more matches: we're done
856 # regexp groups are operand full name, base, and extension
857 (op_full
, op_base
, op_ext
) = op
858 # if the token following the operand is an assignment, this is
859 # a destination (LHS), else it's a source (RHS)
860 is_dest
= (assignRE
.match(code
, match
.end()) != None)
862 # see if we've already seen this one
863 op_desc
= self
.find_base(op_base
)
865 if op_desc
.ext
!= op_ext
:
866 error('Inconsistent extensions for operand %s' % \
868 op_desc
.is_src
= op_desc
.is_src
or is_src
869 op_desc
.is_dest
= op_desc
.is_dest
or is_dest
871 # new operand: create new descriptor
872 op_desc
= parser
.operandNameMap
[op_base
](parser
,
873 op_full
, op_ext
, is_src
, is_dest
)
875 # start next search after end of current match
876 next_pos
= match
.end()
878 # enumerate source & dest register operands... used in building
882 self
.numFPDestRegs
= 0
883 self
.numIntDestRegs
= 0
884 self
.numCCDestRegs
= 0
885 self
.numMiscDestRegs
= 0
886 self
.memOperand
= None
888 # Flags to keep track if one or more operands are to be read/written
890 self
.predRead
= False
891 self
.predWrite
= False
893 for op_desc
in self
.items
:
896 op_desc
.src_reg_idx
= self
.numSrcRegs
899 op_desc
.dest_reg_idx
= self
.numDestRegs
900 self
.numDestRegs
+= 1
901 if op_desc
.isFloatReg():
902 self
.numFPDestRegs
+= 1
903 elif op_desc
.isIntReg():
904 self
.numIntDestRegs
+= 1
905 elif op_desc
.isCCReg():
906 self
.numCCDestRegs
+= 1
907 elif op_desc
.isControlReg():
908 self
.numMiscDestRegs
+= 1
909 elif op_desc
.isMem():
911 error("Code block has more than one memory operand.")
912 self
.memOperand
= op_desc
914 # Check if this operand has read/write predication. If true, then
915 # the microop will dynamically index source/dest registers.
916 self
.predRead
= self
.predRead
or op_desc
.hasReadPred()
917 self
.predWrite
= self
.predWrite
or op_desc
.hasWritePred()
919 if parser
.maxInstSrcRegs
< self
.numSrcRegs
:
920 parser
.maxInstSrcRegs
= self
.numSrcRegs
921 if parser
.maxInstDestRegs
< self
.numDestRegs
:
922 parser
.maxInstDestRegs
= self
.numDestRegs
923 if parser
.maxMiscDestRegs
< self
.numMiscDestRegs
:
924 parser
.maxMiscDestRegs
= self
.numMiscDestRegs
926 # now make a final pass to finalize op_desc fields that may depend
927 # on the register enumeration
928 for op_desc
in self
.items
:
929 op_desc
.finalize(self
.predRead
, self
.predWrite
)
932 return len(self
.items
)
934 def __getitem__(self
, index
):
935 return self
.items
[index
]
937 def append(self
, op_desc
):
938 self
.items
.append(op_desc
)
939 self
.bases
[op_desc
.base_name
] = op_desc
941 def find_base(self
, base_name
):
942 # like self.bases[base_name], but returns None if not found
943 # (rather than raising exception)
944 return self
.bases
.get(base_name
)
946 # internal helper function for concat[Some]Attr{Strings|Lists}
947 def __internalConcatAttrs(self
, attr_name
, filter, result
):
948 for op_desc
in self
.items
:
950 result
+= getattr(op_desc
, attr_name
)
953 # return a single string that is the concatenation of the (string)
954 # values of the specified attribute for all operands
955 def concatAttrStrings(self
, attr_name
):
956 return self
.__internalConcatAttrs
(attr_name
, lambda x
: 1, '')
958 # like concatAttrStrings, but only include the values for the operands
959 # for which the provided filter function returns true
960 def concatSomeAttrStrings(self
, filter, attr_name
):
961 return self
.__internalConcatAttrs
(attr_name
, filter, '')
963 # return a single list that is the concatenation of the (list)
964 # values of the specified attribute for all operands
965 def concatAttrLists(self
, attr_name
):
966 return self
.__internalConcatAttrs
(attr_name
, lambda x
: 1, [])
968 # like concatAttrLists, but only include the values for the operands
969 # for which the provided filter function returns true
970 def concatSomeAttrLists(self
, filter, attr_name
):
971 return self
.__internalConcatAttrs
(attr_name
, filter, [])
974 self
.items
.sort(lambda a
, b
: a
.sort_pri
- b
.sort_pri
)
976 class SubOperandList(OperandList
):
977 '''Find all the operands in the given code block. Returns an operand
978 descriptor list (instance of class OperandList).'''
979 def __init__(self
, parser
, code
, master_list
):
982 # delete strings and comments so we don't match on operands inside
983 for regEx
in (stringRE
, commentRE
):
984 code
= regEx
.sub('', code
)
985 # search for operands
988 match
= parser
.operandsRE
.search(code
, next_pos
)
990 # no more matches: we're done
993 # regexp groups are operand full name, base, and extension
994 (op_full
, op_base
, op_ext
) = op
995 # find this op in the master list
996 op_desc
= master_list
.find_base(op_base
)
998 error('Found operand %s which is not in the master list!'
1001 # See if we've already found this operand
1002 op_desc
= self
.find_base(op_base
)
1004 # if not, add a reference to it to this sub list
1005 self
.append(master_list
.bases
[op_base
])
1007 # start next search after end of current match
1008 next_pos
= match
.end()
1010 self
.memOperand
= None
1011 # Whether the whole PC needs to be read so parts of it can be accessed
1013 # Whether the whole PC needs to be written after parts of it were
1016 # Whether this instruction manipulates the whole PC or parts of it.
1017 # Mixing the two is a bad idea and flagged as an error.
1020 # Flags to keep track if one or more operands are to be read/written
1022 self
.predRead
= False
1023 self
.predWrite
= False
1025 for op_desc
in self
.items
:
1026 if op_desc
.isPCPart():
1031 if op_desc
.isPCState():
1032 if self
.pcPart
is not None:
1033 if self
.pcPart
and not op_desc
.isPCPart() or \
1034 not self
.pcPart
and op_desc
.isPCPart():
1035 error("Mixed whole and partial PC state operands.")
1036 self
.pcPart
= op_desc
.isPCPart()
1040 error("Code block has more than one memory operand.")
1041 self
.memOperand
= op_desc
1043 # Check if this operand has read/write predication. If true, then
1044 # the microop will dynamically index source/dest registers.
1045 self
.predRead
= self
.predRead
or op_desc
.hasReadPred()
1046 self
.predWrite
= self
.predWrite
or op_desc
.hasWritePred()
1048 # Regular expression object to match C++ strings
1049 stringRE
= re
.compile(r
'"([^"\\]|\\.)*"')
1051 # Regular expression object to match C++ comments
1052 # (used in findOperands())
1053 commentRE
= re
.compile(r
'(^)?[^\S\n]*/(?:\*(.*?)\*/[^\S\n]*|/[^\n]*)($)?',
1054 re
.DOTALL | re
.MULTILINE
)
1056 # Regular expression object to match assignment statements (used in
1057 # findOperands()). If the code immediately following the first
1058 # appearance of the operand matches this regex, then the operand
1059 # appears to be on the LHS of an assignment, and is thus a
1060 # destination. basically we're looking for an '=' that's not '=='.
1061 # The heinous tangle before that handles the case where the operand
1062 # has an array subscript.
1063 assignRE
= re
.compile(r
'(\[[^\]]+\])?\s*=(?!=)', re
.MULTILINE
)
1065 def makeFlagConstructor(flag_list
):
1066 if len(flag_list
) == 0:
1068 # filter out repeated flags
1071 while i
< len(flag_list
):
1072 if flag_list
[i
] == flag_list
[i
-1]:
1078 code
= pre
+ string
.join(flag_list
, post
+ pre
) + post
1081 # Assume all instruction flags are of the form 'IsFoo'
1082 instFlagRE
= re
.compile(r
'Is.*')
1084 # OpClass constants end in 'Op' except No_OpClass
1085 opClassRE
= re
.compile(r
'.*Op|No_OpClass')
1087 class InstObjParams(object):
1088 def __init__(self
, parser
, mnem
, class_name
, base_class
= '',
1089 snippets
= {}, opt_args
= []):
1090 self
.mnemonic
= mnem
1091 self
.class_name
= class_name
1092 self
.base_class
= base_class
1093 if not isinstance(snippets
, dict):
1094 snippets
= {'code' : snippets
}
1095 compositeCode
= ' '.join(map(str, snippets
.values()))
1096 self
.snippets
= snippets
1098 self
.operands
= OperandList(parser
, compositeCode
)
1100 # The header of the constructor declares the variables to be used
1101 # in the body of the constructor.
1103 header
+= '\n\t_numSrcRegs = 0;'
1104 header
+= '\n\t_numDestRegs = 0;'
1105 header
+= '\n\t_numFPDestRegs = 0;'
1106 header
+= '\n\t_numIntDestRegs = 0;'
1107 header
+= '\n\t_numCCDestRegs = 0;'
1109 self
.constructor
= header
+ \
1110 self
.operands
.concatAttrStrings('constructor')
1112 self
.flags
= self
.operands
.concatAttrLists('flags')
1114 self
.op_class
= None
1116 # Optional arguments are assumed to be either StaticInst flags
1117 # or an OpClass value. To avoid having to import a complete
1118 # list of these values to match against, we do it ad-hoc
1121 if instFlagRE
.match(oa
):
1122 self
.flags
.append(oa
)
1123 elif opClassRE
.match(oa
):
1126 error('InstObjParams: optional arg "%s" not recognized '
1127 'as StaticInst::Flag or OpClass.' % oa
)
1129 # Make a basic guess on the operand class if not set.
1130 # These are good enough for most cases.
1131 if not self
.op_class
:
1132 if 'IsStore' in self
.flags
:
1133 self
.op_class
= 'MemWriteOp'
1134 elif 'IsLoad' in self
.flags
or 'IsPrefetch' in self
.flags
:
1135 self
.op_class
= 'MemReadOp'
1136 elif 'IsFloating' in self
.flags
:
1137 self
.op_class
= 'FloatAddOp'
1139 self
.op_class
= 'IntAluOp'
1141 # add flag initialization to contructor here to include
1142 # any flags added via opt_args
1143 self
.constructor
+= makeFlagConstructor(self
.flags
)
1145 # if 'IsFloating' is set, add call to the FP enable check
1146 # function (which should be provided by isa_desc via a declare)
1147 if 'IsFloating' in self
.flags
:
1148 self
.fp_enable_check
= 'fault = checkFpEnableFault(xc);'
1150 self
.fp_enable_check
= ''
1153 # Stack: a simple stack object. Used for both formats (formatStack)
1154 # and default cases (defaultStack). Simply wraps a list to give more
1155 # stack-like syntax and enable initialization with an argument list
1156 # (as opposed to an argument that's a list).
1159 def __init__(self
, *items
):
1160 list.__init
__(self
, items
)
1162 def push(self
, item
):
1168 # Format a file include stack backtrace as a string
1169 def backtrace(filename_stack
):
1170 fmt
= "In file included from %s:"
1171 return "\n".join([fmt
% f
for f
in filename_stack
])
1174 #######################
1176 # LineTracker: track filenames along with line numbers in PLY lineno fields
1177 # PLY explicitly doesn't do anything with 'lineno' except propagate
1178 # it. This class lets us tie filenames with the line numbers with a
1179 # minimum of disruption to existing increment code.
1182 class LineTracker(object):
1183 def __init__(self
, filename
, lineno
=1):
1184 self
.filename
= filename
1185 self
.lineno
= lineno
1187 # Overload '+=' for increments. We need to create a new object on
1188 # each update else every token ends up referencing the same
1189 # constantly incrementing instance.
1190 def __iadd__(self
, incr
):
1191 return LineTracker(self
.filename
, self
.lineno
+ incr
)
1194 return "%s:%d" % (self
.filename
, self
.lineno
)
1196 # In case there are places where someone really expects a number
1201 #######################
1204 # parses ISA DSL and emits C++ headers and source
1207 class ISAParser(Grammar
):
1208 class CpuModel(object):
1209 def __init__(self
, name
, filename
, includes
, strings
):
1211 self
.filename
= filename
1212 self
.includes
= includes
1213 self
.strings
= strings
1215 def __init__(self
, output_dir
):
1216 super(ISAParser
, self
).__init
__()
1217 self
.output_dir
= output_dir
1219 self
.filename
= None # for output file watermarking/scaremongering
1222 ISAParser
.CpuModel('ExecContext',
1223 'generic_cpu_exec.cc',
1224 '#include "cpu/exec_context.hh"',
1225 { "CPU_exec_context" : "ExecContext" }),
1228 # variable to hold templates
1229 self
.templateMap
= {}
1231 # This dictionary maps format name strings to Format objects.
1234 # Track open files and, if applicable, how many chunks it has been
1235 # split into so far.
1239 # isa_name / namespace identifier from namespace declaration.
1240 # before the namespace declaration, None.
1241 self
.isa_name
= None
1242 self
.namespace
= None
1245 self
.formatStack
= Stack(NoFormat())
1247 # The default case stack.
1248 self
.defaultStack
= Stack(None)
1250 # Stack that tracks current file and line number. Each
1251 # element is a tuple (filename, lineno) that records the
1252 # *current* filename and the line number in the *previous*
1253 # file where it was included.
1254 self
.fileNameStack
= Stack()
1256 symbols
= ('makeList', 're', 'string')
1257 self
.exportContext
= dict([(s
, eval(s
)) for s
in symbols
])
1259 self
.maxInstSrcRegs
= 0
1260 self
.maxInstDestRegs
= 0
1261 self
.maxMiscDestRegs
= 0
1263 def __getitem__(self
, i
): # Allow object (self) to be
1264 return getattr(self
, i
) # passed to %-substitutions
1266 # Change the file suffix of a base filename:
1267 # (e.g.) decoder.cc -> decoder-g.cc.inc for 'global' outputs
1268 def suffixize(self
, s
, sec
):
1269 extn
= re
.compile('(\.[^\.]+)$') # isolate extension
1271 return extn
.sub(r
'-ns\1.inc', s
) # insert some text on either side
1273 return extn
.sub(r
'-g\1.inc', s
)
1275 # Get the file object for emitting code into the specified section
1276 # (header, decoder, exec, decode_block).
1277 def get_file(self
, section
):
1278 if section
== 'decode_block':
1279 filename
= 'decode-method.cc.inc'
1281 if section
== 'header':
1284 file = '%s.cc' % section
1285 filename
= self
.suffixize(file, section
)
1287 return self
.files
[filename
]
1288 except KeyError: pass
1290 f
= self
.open(filename
)
1291 self
.files
[filename
] = f
1293 # The splittable files are the ones with many independent
1294 # per-instruction functions - the decoder's instruction constructors
1295 # and the instruction execution (execute()) methods. These both have
1296 # the suffix -ns.cc.inc, meaning they are within the namespace part
1297 # of the ISA, contain object-emitting C++ source, and are included
1298 # into other top-level files. These are the files that need special
1299 # #define's to allow parts of them to be compiled separately. Rather
1300 # than splitting the emissions into separate files, the monolithic
1301 # output of the ISA parser is maintained, but the value (or lack
1302 # thereof) of the __SPLIT definition during C preprocessing will
1303 # select the different chunks. If no 'split' directives are used,
1304 # the cpp emissions have no effect.
1305 if re
.search('-ns.cc.inc$', filename
):
1306 print >>f
, '#if !defined(__SPLIT) || (__SPLIT == 1)'
1308 # ensure requisite #include's
1309 elif filename
in ['decoder-g.cc.inc', 'exec-g.cc.inc']:
1310 print >>f
, '#include "decoder.hh"'
1311 elif filename
== 'decoder-g.hh.inc':
1312 print >>f
, '#include "base/bitfield.hh"'
1316 # Weave together the parts of the different output sections by
1317 # #include'ing them into some very short top-level .cc/.hh files.
1318 # These small files make it much clearer how this tool works, since
1319 # you directly see the chunks emitted as files that are #include'd.
1320 def write_top_level_files(self
):
1321 dep
= self
.open('inc.d', bare
=True)
1323 # decoder header - everything depends on this
1325 with self
.open(file) as f
:
1328 fn
= 'decoder-g.hh.inc'
1329 assert(fn
in self
.files
)
1330 f
.write('#include "%s"\n' % fn
)
1333 fn
= 'decoder-ns.hh.inc'
1334 assert(fn
in self
.files
)
1335 f
.write('namespace %s {\n#include "%s"\n}\n'
1336 % (self
.namespace
, fn
))
1339 print >>dep
, file+':', ' '.join(inc
)
1341 # decoder method - cannot be split
1343 with self
.open(file) as f
:
1346 fn
= 'decoder-g.cc.inc'
1347 assert(fn
in self
.files
)
1348 f
.write('#include "%s"\n' % fn
)
1351 fn
= 'decode-method.cc.inc'
1352 # is guaranteed to have been written for parse to complete
1353 f
.write('#include "%s"\n' % fn
)
1356 inc
.append("decoder.hh")
1357 print >>dep
, file+':', ' '.join(inc
)
1359 extn
= re
.compile('(\.[^\.]+)$')
1361 # instruction constructors
1362 splits
= self
.splits
[self
.get_file('decoder')]
1363 file_
= 'inst-constrs.cc'
1364 for i
in range(1, splits
+1):
1366 file = extn
.sub(r
'-%d\1' % i
, file_
)
1369 with self
.open(file) as f
:
1372 fn
= 'decoder-g.cc.inc'
1373 assert(fn
in self
.files
)
1374 f
.write('#include "%s"\n' % fn
)
1377 fn
= 'decoder-ns.cc.inc'
1378 assert(fn
in self
.files
)
1379 print >>f
, 'namespace %s {' % self
.namespace
1381 print >>f
, '#define __SPLIT %u' % i
1382 print >>f
, '#include "%s"' % fn
1386 inc
.append("decoder.hh")
1387 print >>dep
, file+':', ' '.join(inc
)
1389 # instruction execution per-CPU model
1390 splits
= self
.splits
[self
.get_file('exec')]
1391 for cpu
in self
.cpuModels
:
1392 for i
in range(1, splits
+1):
1394 file = extn
.sub(r
'_%d\1' % i
, cpu
.filename
)
1397 with self
.open(file) as f
:
1400 fn
= 'exec-g.cc.inc'
1401 assert(fn
in self
.files
)
1402 f
.write('#include "%s"\n' % fn
)
1405 f
.write(cpu
.includes
+"\n")
1407 fn
= 'exec-ns.cc.inc'
1408 assert(fn
in self
.files
)
1409 print >>f
, 'namespace %s {' % self
.namespace
1410 print >>f
, '#define CPU_EXEC_CONTEXT %s' \
1411 % cpu
.strings
['CPU_exec_context']
1413 print >>f
, '#define __SPLIT %u' % i
1414 print >>f
, '#include "%s"' % fn
1418 inc
.append("decoder.hh")
1419 print >>dep
, file+':', ' '.join(inc
)
1422 self
.update('max_inst_regs.hh',
1423 '''namespace %(namespace)s {
1424 const int MaxInstSrcRegs = %(maxInstSrcRegs)d;
1425 const int MaxInstDestRegs = %(maxInstDestRegs)d;
1426 const int MaxMiscDestRegs = %(maxMiscDestRegs)d;\n}\n''' % self
)
1427 print >>dep
, 'max_inst_regs.hh:'
1432 scaremonger_template
='''// DO NOT EDIT
1433 // This file was automatically generated from an ISA description:
1438 #####################################################################
1442 # The PLY lexer module takes two things as input:
1443 # - A list of token names (the string list 'tokens')
1444 # - A regular expression describing a match for each token. The
1445 # regexp for token FOO can be provided in two ways:
1446 # - as a string variable named t_FOO
1447 # - as the doc string for a function named t_FOO. In this case,
1448 # the function is also executed, allowing an action to be
1449 # associated with each token match.
1451 #####################################################################
1453 # Reserved words. These are listed separately as they are matched
1454 # using the same regexp as generic IDs, but distinguished in the
1455 # t_ID() function. The PLY documentation suggests this approach.
1457 'BITFIELD', 'DECODE', 'DECODER', 'DEFAULT', 'DEF', 'EXEC', 'FORMAT',
1458 'HEADER', 'LET', 'NAMESPACE', 'OPERAND_TYPES', 'OPERANDS',
1459 'OUTPUT', 'SIGNED', 'SPLIT', 'TEMPLATE'
1462 # List of tokens. The lex module requires this.
1463 tokens
= reserved
+ (
1476 # ( ) [ ] { } < > , ; . : :: *
1478 'LBRACKET', 'RBRACKET',
1480 'LESS', 'GREATER', 'EQUALS',
1481 'COMMA', 'SEMI', 'DOT', 'COLON', 'DBLCOLON',
1484 # C preprocessor directives
1487 # The following are matched but never returned. commented out to
1488 # suppress PLY warning
1496 # Regular expressions for token matching
1513 # Identifiers and reserved words
1516 reserved_map
[r
.lower()] = r
1520 t
.type = self
.reserved_map
.get(t
.value
, 'ID')
1524 def t_INTLIT(self
, t
):
1525 r
'-?(0x[\da-fA-F]+)|\d+'
1527 t
.value
= int(t
.value
,0)
1529 error(t
.lexer
.lineno
, 'Integer value "%s" too large' % t
.value
)
1533 # String literal. Note that these use only single quotes, and
1534 # can span multiple lines.
1535 def t_STRLIT(self
, t
):
1538 t
.value
= t
.value
[1:-1]
1539 t
.lexer
.lineno
+= t
.value
.count('\n')
1543 # "Code literal"... like a string literal, but delimiters are
1544 # '{{' and '}}' so they get formatted nicely under emacs c-mode
1545 def t_CODELIT(self
, t
):
1546 r
"(?m)\{\{([^\}]|}(?!\}))+\}\}"
1548 t
.value
= t
.value
[2:-2]
1549 t
.lexer
.lineno
+= t
.value
.count('\n')
1552 def t_CPPDIRECTIVE(self
, t
):
1554 t
.lexer
.lineno
+= t
.value
.count('\n')
1557 def t_NEWFILE(self
, t
):
1558 r
'^\#\#newfile\s+"[^"]*"\n'
1559 self
.fileNameStack
.push(t
.lexer
.lineno
)
1560 t
.lexer
.lineno
= LineTracker(t
.value
[11:-2])
1562 def t_ENDFILE(self
, t
):
1564 t
.lexer
.lineno
= self
.fileNameStack
.pop()
1567 # The functions t_NEWLINE, t_ignore, and t_error are
1568 # special for the lex module.
1572 def t_NEWLINE(self
, t
):
1574 t
.lexer
.lineno
+= t
.value
.count('\n')
1577 def t_comment(self
, t
):
1580 # Completely ignored characters
1581 t_ignore
= ' \t\x0c'
1584 def t_error(self
, t
):
1585 error(t
.lexer
.lineno
, "illegal character '%s'" % t
.value
[0])
1588 #####################################################################
1592 # Every function whose name starts with 'p_' defines a grammar
1593 # rule. The rule is encoded in the function's doc string, while
1594 # the function body provides the action taken when the rule is
1595 # matched. The argument to each function is a list of the values
1596 # of the rule's symbols: t[0] for the LHS, and t[1..n] for the
1597 # symbols on the RHS. For tokens, the value is copied from the
1598 # t.value attribute provided by the lexer. For non-terminals, the
1599 # value is assigned by the producing rule; i.e., the job of the
1600 # grammar rule function is to set the value for the non-terminal
1601 # on the LHS (by assigning to t[0]).
1602 #####################################################################
1604 # The LHS of the first grammar rule is used as the start symbol
1605 # (in this case, 'specification'). Note that this rule enforces
1606 # that there will be exactly one namespace declaration, with 0 or
1607 # more global defs/decls before and after it. The defs & decls
1608 # before the namespace decl will be outside the namespace; those
1609 # after will be inside. The decoder function is always inside the
1611 def p_specification(self
, t
):
1612 'specification : opt_defs_and_outputs top_level_decode_block'
1614 for f
in self
.splits
.iterkeys():
1615 f
.write('\n#endif\n')
1617 for f
in self
.files
.itervalues(): # close ALL the files;
1618 f
.close() # not doing so can cause compilation to fail
1620 self
.write_top_level_files()
1624 # 'opt_defs_and_outputs' is a possibly empty sequence of def and/or
1625 # output statements. Its productions do the hard work of eventually
1626 # instantiating a GenCode, which are generally emitted (written to disk)
1627 # as soon as possible, except for the decode_block, which has to be
1628 # accumulated into one large function of nested switch/case blocks.
1629 def p_opt_defs_and_outputs_0(self
, t
):
1630 'opt_defs_and_outputs : empty'
1632 def p_opt_defs_and_outputs_1(self
, t
):
1633 'opt_defs_and_outputs : defs_and_outputs'
1635 def p_defs_and_outputs_0(self
, t
):
1636 'defs_and_outputs : def_or_output'
1638 def p_defs_and_outputs_1(self
, t
):
1639 'defs_and_outputs : defs_and_outputs def_or_output'
1641 # The list of possible definition/output statements.
1642 # They are all processed as they are seen.
1643 def p_def_or_output(self
, t
):
1644 '''def_or_output : name_decl
1647 | def_bitfield_struct
1655 # Utility function used by both invocations of splitting - explicit
1656 # 'split' keyword and split() function inside "let {{ }};" blocks.
1657 def split(self
, sec
, write
=False):
1658 assert(sec
!= 'header' and "header cannot be split")
1660 f
= self
.get_file(sec
)
1662 s
= '\n#endif\n#if __SPLIT == %u\n' % self
.splits
[f
]
1668 # split output file to reduce compilation time
1669 def p_split(self
, t
):
1670 'split : SPLIT output_type SEMI'
1671 assert(self
.isa_name
and "'split' not allowed before namespace decl")
1673 self
.split(t
[2], True)
1675 def p_output_type(self
, t
):
1676 '''output_type : DECODER
1681 # ISA name declaration looks like "namespace <foo>;"
1682 def p_name_decl(self
, t
):
1683 'name_decl : NAMESPACE ID SEMI'
1684 assert(self
.isa_name
== None and "Only 1 namespace decl permitted")
1685 self
.isa_name
= t
[2]
1686 self
.namespace
= t
[2] + 'Inst'
1688 # Output blocks 'output <foo> {{...}}' (C++ code blocks) are copied
1689 # directly to the appropriate output section.
1691 # Massage output block by substituting in template definitions and
1692 # bit operators. We handle '%'s embedded in the string that don't
1693 # indicate template substitutions (or CPU-specific symbols, which
1694 # get handled in GenCode) by doubling them first so that the
1695 # format operation will reduce them back to single '%'s.
1696 def process_output(self
, s
):
1697 s
= self
.protectNonSubstPercents(s
)
1698 # protects cpu-specific symbols too
1699 s
= self
.protectCpuSymbols(s
)
1700 return substBitOps(s
% self
.templateMap
)
1702 def p_output(self
, t
):
1703 'output : OUTPUT output_type CODELIT SEMI'
1704 kwargs
= { t
[2]+'_output' : self
.process_output(t
[3]) }
1705 GenCode(self
, **kwargs
).emit()
1707 # global let blocks 'let {{...}}' (Python code blocks) are
1708 # executed directly when seen. Note that these execute in a
1709 # special variable context 'exportContext' to prevent the code
1710 # from polluting this script's namespace.
1711 def p_global_let(self
, t
):
1712 'global_let : LET CODELIT SEMI'
1714 return self
.split(sec
)
1715 self
.updateExportContext()
1716 self
.exportContext
["header_output"] = ''
1717 self
.exportContext
["decoder_output"] = ''
1718 self
.exportContext
["exec_output"] = ''
1719 self
.exportContext
["decode_block"] = ''
1720 self
.exportContext
["split"] = _split
1724 globals()[sec + '_output'] += func(sec)
1729 # This tricky setup (immediately above) allows us to just write
1730 # (e.g.) "split('exec')" in the Python code and the split #ifdef's
1731 # will automatically be added to the exec_output variable. The inner
1732 # Python execution environment doesn't know about the split points,
1733 # so we carefully inject and wrap a closure that can retrieve the
1734 # next split's #define from the parser and add it to the current
1735 # emission-in-progress.
1737 exec split_setup
+fixPythonIndentation(t
[2]) in self
.exportContext
1738 except Exception, exc
:
1741 error(t
.lineno(1), 'In global let block: %s' % exc
)
1743 header_output
=self
.exportContext
["header_output"],
1744 decoder_output
=self
.exportContext
["decoder_output"],
1745 exec_output
=self
.exportContext
["exec_output"],
1746 decode_block
=self
.exportContext
["decode_block"]).emit()
1748 # Define the mapping from operand type extensions to C++ types and
1749 # bit widths (stored in operandTypeMap).
1750 def p_def_operand_types(self
, t
):
1751 'def_operand_types : DEF OPERAND_TYPES CODELIT SEMI'
1753 self
.operandTypeMap
= eval('{' + t
[3] + '}')
1754 except Exception, exc
:
1758 'In def operand_types: %s' % exc
)
1760 # Define the mapping from operand names to operand classes and
1761 # other traits. Stored in operandNameMap.
1762 def p_def_operands(self
, t
):
1763 'def_operands : DEF OPERANDS CODELIT SEMI'
1764 if not hasattr(self
, 'operandTypeMap'):
1766 'error: operand types must be defined before operands')
1768 user_dict
= eval('{' + t
[3] + '}', self
.exportContext
)
1769 except Exception, exc
:
1772 error(t
.lineno(1), 'In def operands: %s' % exc
)
1773 self
.buildOperandNameMap(user_dict
, t
.lexer
.lineno
)
1775 # A bitfield definition looks like:
1776 # 'def [signed] bitfield <ID> [<first>:<last>]'
1777 # This generates a preprocessor macro in the output file.
1778 def p_def_bitfield_0(self
, t
):
1779 'def_bitfield : DEF opt_signed BITFIELD ID LESS INTLIT COLON INTLIT GREATER SEMI'
1780 expr
= 'bits(machInst, %2d, %2d)' % (t
[6], t
[8])
1781 if (t
[2] == 'signed'):
1782 expr
= 'sext<%d>(%s)' % (t
[6] - t
[8] + 1, expr
)
1783 hash_define
= '#undef %s\n#define %s\t%s\n' % (t
[4], t
[4], expr
)
1784 GenCode(self
, header_output
=hash_define
).emit()
1786 # alternate form for single bit: 'def [signed] bitfield <ID> [<bit>]'
1787 def p_def_bitfield_1(self
, t
):
1788 'def_bitfield : DEF opt_signed BITFIELD ID LESS INTLIT GREATER SEMI'
1789 expr
= 'bits(machInst, %2d, %2d)' % (t
[6], t
[6])
1790 if (t
[2] == 'signed'):
1791 expr
= 'sext<%d>(%s)' % (1, expr
)
1792 hash_define
= '#undef %s\n#define %s\t%s\n' % (t
[4], t
[4], expr
)
1793 GenCode(self
, header_output
=hash_define
).emit()
1795 # alternate form for structure member: 'def bitfield <ID> <ID>'
1796 def p_def_bitfield_struct(self
, t
):
1797 'def_bitfield_struct : DEF opt_signed BITFIELD ID id_with_dot SEMI'
1800 'error: structure bitfields are always unsigned.')
1801 expr
= 'machInst.%s' % t
[5]
1802 hash_define
= '#undef %s\n#define %s\t%s\n' % (t
[4], t
[4], expr
)
1803 GenCode(self
, header_output
=hash_define
).emit()
1805 def p_id_with_dot_0(self
, t
):
1809 def p_id_with_dot_1(self
, t
):
1810 'id_with_dot : ID DOT id_with_dot'
1811 t
[0] = t
[1] + t
[2] + t
[3]
1813 def p_opt_signed_0(self
, t
):
1814 'opt_signed : SIGNED'
1817 def p_opt_signed_1(self
, t
):
1818 'opt_signed : empty'
1821 def p_def_template(self
, t
):
1822 'def_template : DEF TEMPLATE ID CODELIT SEMI'
1823 if t
[3] in self
.templateMap
:
1824 print "warning: template %s already defined" % t
[3]
1825 self
.templateMap
[t
[3]] = Template(self
, t
[4])
1827 # An instruction format definition looks like
1828 # "def format <fmt>(<params>) {{...}};"
1829 def p_def_format(self
, t
):
1830 'def_format : DEF FORMAT ID LPAREN param_list RPAREN CODELIT SEMI'
1831 (id, params
, code
) = (t
[3], t
[5], t
[7])
1832 self
.defFormat(id, params
, code
, t
.lexer
.lineno
)
1834 # The formal parameter list for an instruction format is a
1835 # possibly empty list of comma-separated parameters. Positional
1836 # (standard, non-keyword) parameters must come first, followed by
1837 # keyword parameters, followed by a '*foo' parameter that gets
1838 # excess positional arguments (as in Python). Each of these three
1839 # parameter categories is optional.
1841 # Note that we do not support the '**foo' parameter for collecting
1842 # otherwise undefined keyword args. Otherwise the parameter list
1843 # is (I believe) identical to what is supported in Python.
1845 # The param list generates a tuple, where the first element is a
1846 # list of the positional params and the second element is a dict
1847 # containing the keyword params.
1848 def p_param_list_0(self
, t
):
1849 'param_list : positional_param_list COMMA nonpositional_param_list'
1852 def p_param_list_1(self
, t
):
1853 '''param_list : positional_param_list
1854 | nonpositional_param_list'''
1857 def p_positional_param_list_0(self
, t
):
1858 'positional_param_list : empty'
1861 def p_positional_param_list_1(self
, t
):
1862 'positional_param_list : ID'
1865 def p_positional_param_list_2(self
, t
):
1866 'positional_param_list : positional_param_list COMMA ID'
1867 t
[0] = t
[1] + [t
[3]]
1869 def p_nonpositional_param_list_0(self
, t
):
1870 'nonpositional_param_list : keyword_param_list COMMA excess_args_param'
1873 def p_nonpositional_param_list_1(self
, t
):
1874 '''nonpositional_param_list : keyword_param_list
1875 | excess_args_param'''
1878 def p_keyword_param_list_0(self
, t
):
1879 'keyword_param_list : keyword_param'
1882 def p_keyword_param_list_1(self
, t
):
1883 'keyword_param_list : keyword_param_list COMMA keyword_param'
1884 t
[0] = t
[1] + [t
[3]]
1886 def p_keyword_param(self
, t
):
1887 'keyword_param : ID EQUALS expr'
1888 t
[0] = t
[1] + ' = ' + t
[3].__repr
__()
1890 def p_excess_args_param(self
, t
):
1891 'excess_args_param : ASTERISK ID'
1892 # Just concatenate them: '*ID'. Wrap in list to be consistent
1893 # with positional_param_list and keyword_param_list.
1894 t
[0] = [t
[1] + t
[2]]
1896 # End of format definition-related rules.
1900 # A decode block looks like:
1901 # decode <field1> [, <field2>]* [default <inst>] { ... }
1903 def p_top_level_decode_block(self
, t
):
1904 'top_level_decode_block : decode_block'
1906 codeObj
.wrap_decode_block('''
1908 %(isa_name)s::Decoder::decodeInst(%(isa_name)s::ExtMachInst machInst)
1910 using namespace %(namespace)s;
1915 def p_decode_block(self
, t
):
1916 'decode_block : DECODE ID opt_default LBRACE decode_stmt_list RBRACE'
1917 default_defaults
= self
.defaultStack
.pop()
1919 # use the "default defaults" only if there was no explicit
1920 # default statement in decode_stmt_list
1921 if not codeObj
.has_decode_default
:
1922 codeObj
+= default_defaults
1923 codeObj
.wrap_decode_block('switch (%s) {\n' % t
[2], '}\n')
1926 # The opt_default statement serves only to push the "default
1927 # defaults" onto defaultStack. This value will be used by nested
1928 # decode blocks, and used and popped off when the current
1929 # decode_block is processed (in p_decode_block() above).
1930 def p_opt_default_0(self
, t
):
1931 'opt_default : empty'
1932 # no default specified: reuse the one currently at the top of
1934 self
.defaultStack
.push(self
.defaultStack
.top())
1935 # no meaningful value returned
1938 def p_opt_default_1(self
, t
):
1939 'opt_default : DEFAULT inst'
1940 # push the new default
1942 codeObj
.wrap_decode_block('\ndefault:\n', 'break;\n')
1943 self
.defaultStack
.push(codeObj
)
1944 # no meaningful value returned
1947 def p_decode_stmt_list_0(self
, t
):
1948 'decode_stmt_list : decode_stmt'
1951 def p_decode_stmt_list_1(self
, t
):
1952 'decode_stmt_list : decode_stmt decode_stmt_list'
1953 if (t
[1].has_decode_default
and t
[2].has_decode_default
):
1954 error(t
.lineno(1), 'Two default cases in decode block')
1958 # Decode statement rules
1960 # There are four types of statements allowed in a decode block:
1961 # 1. Format blocks 'format <foo> { ... }'
1962 # 2. Nested decode blocks
1963 # 3. Instruction definitions.
1964 # 4. C preprocessor directives.
1967 # Preprocessor directives found in a decode statement list are
1968 # passed through to the output, replicated to all of the output
1969 # code streams. This works well for ifdefs, so we can ifdef out
1970 # both the declarations and the decode cases generated by an
1971 # instruction definition. Handling them as part of the grammar
1972 # makes it easy to keep them in the right place with respect to
1973 # the code generated by the other statements.
1974 def p_decode_stmt_cpp(self
, t
):
1975 'decode_stmt : CPPDIRECTIVE'
1976 t
[0] = GenCode(self
, t
[1], t
[1], t
[1], t
[1])
1978 # A format block 'format <foo> { ... }' sets the default
1979 # instruction format used to handle instruction definitions inside
1980 # the block. This format can be overridden by using an explicit
1981 # format on the instruction definition or with a nested format
1983 def p_decode_stmt_format(self
, t
):
1984 'decode_stmt : FORMAT push_format_id LBRACE decode_stmt_list RBRACE'
1985 # The format will be pushed on the stack when 'push_format_id'
1986 # is processed (see below). Once the parser has recognized
1987 # the full production (though the right brace), we're done
1988 # with the format, so now we can pop it.
1989 self
.formatStack
.pop()
1992 # This rule exists so we can set the current format (& push the
1993 # stack) when we recognize the format name part of the format
1995 def p_push_format_id(self
, t
):
1996 'push_format_id : ID'
1998 self
.formatStack
.push(self
.formatMap
[t
[1]])
1999 t
[0] = ('', '// format %s' % t
[1])
2001 error(t
.lineno(1), 'instruction format "%s" not defined.' % t
[1])
2003 # Nested decode block: if the value of the current field matches
2004 # the specified constant(s), do a nested decode on some other field.
2005 def p_decode_stmt_decode(self
, t
):
2006 'decode_stmt : case_list COLON decode_block'
2009 # just wrap the decoding code from the block as a case in the
2010 # outer switch statement.
2011 codeObj
.wrap_decode_block('\n%s\n' % ''.join(case_list
))
2012 codeObj
.has_decode_default
= (case_list
== ['default:'])
2015 # Instruction definition (finally!).
2016 def p_decode_stmt_inst(self
, t
):
2017 'decode_stmt : case_list COLON inst SEMI'
2020 codeObj
.wrap_decode_block('\n%s' % ''.join(case_list
), 'break;\n')
2021 codeObj
.has_decode_default
= (case_list
== ['default:'])
2024 # The constant list for a decode case label must be non-empty, and must
2025 # either be the keyword 'default', or made up of one or more
2026 # comma-separated integer literals or strings which evaluate to
2027 # constants when compiled as C++.
2028 def p_case_list_0(self
, t
):
2029 'case_list : DEFAULT'
2032 def prep_int_lit_case_label(self
, lit
):
2034 return 'case ULL(%#x): ' % lit
2036 return 'case %#x: ' % lit
2038 def prep_str_lit_case_label(self
, lit
):
2039 return 'case %s: ' % lit
2041 def p_case_list_1(self
, t
):
2042 'case_list : INTLIT'
2043 t
[0] = [self
.prep_int_lit_case_label(t
[1])]
2045 def p_case_list_2(self
, t
):
2046 'case_list : STRLIT'
2047 t
[0] = [self
.prep_str_lit_case_label(t
[1])]
2049 def p_case_list_3(self
, t
):
2050 'case_list : case_list COMMA INTLIT'
2052 t
[0].append(self
.prep_int_lit_case_label(t
[3]))
2054 def p_case_list_4(self
, t
):
2055 'case_list : case_list COMMA STRLIT'
2057 t
[0].append(self
.prep_str_lit_case_label(t
[3]))
2059 # Define an instruction using the current instruction format
2060 # (specified by an enclosing format block).
2061 # "<mnemonic>(<args>)"
2062 def p_inst_0(self
, t
):
2063 'inst : ID LPAREN arg_list RPAREN'
2064 # Pass the ID and arg list to the current format class to deal with.
2065 currentFormat
= self
.formatStack
.top()
2066 codeObj
= currentFormat
.defineInst(self
, t
[1], t
[3], t
.lexer
.lineno
)
2067 args
= ','.join(map(str, t
[3]))
2068 args
= re
.sub('(?m)^', '//', args
)
2069 args
= re
.sub('^//', '', args
)
2070 comment
= '\n// %s::%s(%s)\n' % (currentFormat
.id, t
[1], args
)
2071 codeObj
.prepend_all(comment
)
2074 # Define an instruction using an explicitly specified format:
2075 # "<fmt>::<mnemonic>(<args>)"
2076 def p_inst_1(self
, t
):
2077 'inst : ID DBLCOLON ID LPAREN arg_list RPAREN'
2079 format
= self
.formatMap
[t
[1]]
2081 error(t
.lineno(1), 'instruction format "%s" not defined.' % t
[1])
2083 codeObj
= format
.defineInst(self
, t
[3], t
[5], t
.lexer
.lineno
)
2084 comment
= '\n// %s::%s(%s)\n' % (t
[1], t
[3], t
[5])
2085 codeObj
.prepend_all(comment
)
2088 # The arg list generates a tuple, where the first element is a
2089 # list of the positional args and the second element is a dict
2090 # containing the keyword args.
2091 def p_arg_list_0(self
, t
):
2092 'arg_list : positional_arg_list COMMA keyword_arg_list'
2093 t
[0] = ( t
[1], t
[3] )
2095 def p_arg_list_1(self
, t
):
2096 'arg_list : positional_arg_list'
2099 def p_arg_list_2(self
, t
):
2100 'arg_list : keyword_arg_list'
2103 def p_positional_arg_list_0(self
, t
):
2104 'positional_arg_list : empty'
2107 def p_positional_arg_list_1(self
, t
):
2108 'positional_arg_list : expr'
2111 def p_positional_arg_list_2(self
, t
):
2112 'positional_arg_list : positional_arg_list COMMA expr'
2113 t
[0] = t
[1] + [t
[3]]
2115 def p_keyword_arg_list_0(self
, t
):
2116 'keyword_arg_list : keyword_arg'
2119 def p_keyword_arg_list_1(self
, t
):
2120 'keyword_arg_list : keyword_arg_list COMMA keyword_arg'
2124 def p_keyword_arg(self
, t
):
2125 'keyword_arg : ID EQUALS expr'
2126 t
[0] = { t
[1] : t
[3] }
2129 # Basic expressions. These constitute the argument values of
2130 # "function calls" (i.e. instruction definitions in the decode
2131 # block) and default values for formal parameters of format
2134 # Right now, these are either strings, integers, or (recursively)
2135 # lists of exprs (using Python square-bracket list syntax). Note
2136 # that bare identifiers are trated as string constants here (since
2137 # there isn't really a variable namespace to refer to).
2139 def p_expr_0(self
, t
):
2146 def p_expr_1(self
, t
):
2147 '''expr : LBRACKET list_expr RBRACKET'''
2150 def p_list_expr_0(self
, t
):
2154 def p_list_expr_1(self
, t
):
2155 'list_expr : list_expr COMMA expr'
2156 t
[0] = t
[1] + [t
[3]]
2158 def p_list_expr_2(self
, t
):
2163 # Empty production... use in other rules for readability.
2165 def p_empty(self
, t
):
2169 # Parse error handler. Note that the argument here is the
2170 # offending *token*, not a grammar symbol (hence the need to use
2172 def p_error(self
, t
):
2174 error(t
.lexer
.lineno
, "syntax error at '%s'" % t
.value
)
2176 error("unknown syntax error")
2178 # END OF GRAMMAR RULES
2180 def updateExportContext(self
):
2182 # create a continuation that allows us to grab the current parser
2183 def wrapInstObjParams(*args
):
2184 return InstObjParams(self
, *args
)
2185 self
.exportContext
['InstObjParams'] = wrapInstObjParams
2186 self
.exportContext
.update(self
.templateMap
)
2188 def defFormat(self
, id, params
, code
, lineno
):
2189 '''Define a new format'''
2191 # make sure we haven't already defined this one
2192 if id in self
.formatMap
:
2193 error(lineno
, 'format %s redefined.' % id)
2195 # create new object and store in global map
2196 self
.formatMap
[id] = Format(id, params
, code
)
2198 def expandCpuSymbolsToDict(self
, template
):
2199 '''Expand template with CPU-specific references into a
2200 dictionary with an entry for each CPU model name. The entry
2201 key is the model name and the corresponding value is the
2202 template with the CPU-specific refs substituted for that
2205 # Protect '%'s that don't go with CPU-specific terms
2206 t
= re
.sub(r
'%(?!\(CPU_)', '%%', template
)
2208 for cpu
in self
.cpuModels
:
2209 result
[cpu
.name
] = t
% cpu
.strings
2212 def expandCpuSymbolsToString(self
, template
):
2213 '''*If* the template has CPU-specific references, return a
2214 single string containing a copy of the template for each CPU
2215 model with the corresponding values substituted in. If the
2216 template has no CPU-specific references, it is returned
2219 if template
.find('%(CPU_') != -1:
2220 return reduce(lambda x
,y
: x
+y
,
2221 self
.expandCpuSymbolsToDict(template
).values())
2225 def protectCpuSymbols(self
, template
):
2226 '''Protect CPU-specific references by doubling the
2227 corresponding '%'s (in preparation for substituting a different
2228 set of references into the template).'''
2230 return re
.sub(r
'%(?=\(CPU_)', '%%', template
)
2232 def protectNonSubstPercents(self
, s
):
2233 '''Protect any non-dict-substitution '%'s in a format string
2234 (i.e. those not followed by '(')'''
2236 return re
.sub(r
'%(?!\()', '%%', s
)
2238 def buildOperandNameMap(self
, user_dict
, lineno
):
2240 for op_name
, val
in user_dict
.iteritems():
2242 # Check if extra attributes have been specified.
2244 error(lineno
, 'error: too many attributes for operand "%s"' %
2247 # Pad val with None in case optional args are missing
2248 val
+= (None, None, None, None)
2249 base_cls_name
, dflt_ext
, reg_spec
, flags
, sort_pri
, \
2250 read_code
, write_code
, read_predicate
, write_predicate
= val
[:9]
2252 # Canonical flag structure is a triple of lists, where each list
2253 # indicates the set of flags implied by this operand always, when
2254 # used as a source, and when used as a dest, respectively.
2255 # For simplicity this can be initialized using a variety of fairly
2256 # obvious shortcuts; we convert these to canonical form here.
2258 # no flags specified (e.g., 'None')
2259 flags
= ( [], [], [] )
2260 elif isinstance(flags
, str):
2261 # a single flag: assumed to be unconditional
2262 flags
= ( [ flags
], [], [] )
2263 elif isinstance(flags
, list):
2264 # a list of flags: also assumed to be unconditional
2265 flags
= ( flags
, [], [] )
2266 elif isinstance(flags
, tuple):
2267 # it's a tuple: it should be a triple,
2268 # but each item could be a single string or a list
2269 (uncond_flags
, src_flags
, dest_flags
) = flags
2270 flags
= (makeList(uncond_flags
),
2271 makeList(src_flags
), makeList(dest_flags
))
2273 # Accumulate attributes of new operand class in tmp_dict
2275 attrList
= ['reg_spec', 'flags', 'sort_pri',
2276 'read_code', 'write_code',
2277 'read_predicate', 'write_predicate']
2279 dflt_ctype
= self
.operandTypeMap
[dflt_ext
]
2280 attrList
.extend(['dflt_ctype', 'dflt_ext'])
2281 for attr
in attrList
:
2282 tmp_dict
[attr
] = eval(attr
)
2283 tmp_dict
['base_name'] = op_name
2285 # New class name will be e.g. "IntReg_Ra"
2286 cls_name
= base_cls_name
+ '_' + op_name
2287 # Evaluate string arg to get class object. Note that the
2288 # actual base class for "IntReg" is "IntRegOperand", i.e. we
2289 # have to append "Operand".
2291 base_cls
= eval(base_cls_name
+ 'Operand')
2294 'error: unknown operand base class "%s"' % base_cls_name
)
2295 # The following statement creates a new class called
2296 # <cls_name> as a subclass of <base_cls> with the attributes
2297 # in tmp_dict, just as if we evaluated a class declaration.
2298 operand_name
[op_name
] = type(cls_name
, (base_cls
,), tmp_dict
)
2300 self
.operandNameMap
= operand_name
2302 # Define operand variables.
2303 operands
= user_dict
.keys()
2304 extensions
= self
.operandTypeMap
.keys()
2306 operandsREString
= r
'''
2307 (?<!\w) # neg. lookbehind assertion: prevent partial matches
2308 ((%s)(?:_(%s))?) # match: operand with optional '_' then suffix
2309 (?!\w) # neg. lookahead assertion: prevent partial matches
2310 ''' % (string
.join(operands
, '|'), string
.join(extensions
, '|'))
2312 self
.operandsRE
= re
.compile(operandsREString
, re
.MULTILINE|re
.VERBOSE
)
2314 # Same as operandsREString, but extension is mandatory, and only two
2315 # groups are returned (base and ext, not full name as above).
2316 # Used for subtituting '_' for '.' to make C++ identifiers.
2317 operandsWithExtREString
= r
'(?<!\w)(%s)_(%s)(?!\w)' \
2318 % (string
.join(operands
, '|'), string
.join(extensions
, '|'))
2320 self
.operandsWithExtRE
= \
2321 re
.compile(operandsWithExtREString
, re
.MULTILINE
)
2323 def substMungedOpNames(self
, code
):
2324 '''Munge operand names in code string to make legal C++
2325 variable names. This means getting rid of the type extension
2326 if any. Will match base_name attribute of Operand object.)'''
2327 return self
.operandsWithExtRE
.sub(r
'\1', code
)
2329 def mungeSnippet(self
, s
):
2330 '''Fix up code snippets for final substitution in templates.'''
2331 if isinstance(s
, str):
2332 return self
.substMungedOpNames(substBitOps(s
))
2336 def open(self
, name
, bare
=False):
2337 '''Open the output file for writing and include scary warning.'''
2338 filename
= os
.path
.join(self
.output_dir
, name
)
2339 f
= open(filename
, 'w')
2342 f
.write(ISAParser
.scaremonger_template
% self
)
2345 def update(self
, file, contents
):
2346 '''Update the output file only. Scons should handle the case when
2347 the new contents are unchanged using its built-in hash feature.'''
2352 # This regular expression matches '##include' directives
2353 includeRE
= re
.compile(r
'^\s*##include\s+"(?P<filename>[^"]*)".*$',
2356 def replace_include(self
, matchobj
, dirname
):
2357 """Function to replace a matched '##include' directive with the
2358 contents of the specified file (with nested ##includes
2359 replaced recursively). 'matchobj' is an re match object
2360 (from a match of includeRE) and 'dirname' is the directory
2361 relative to which the file path should be resolved."""
2363 fname
= matchobj
.group('filename')
2364 full_fname
= os
.path
.normpath(os
.path
.join(dirname
, fname
))
2365 contents
= '##newfile "%s"\n%s\n##endfile\n' % \
2366 (full_fname
, self
.read_and_flatten(full_fname
))
2369 def read_and_flatten(self
, filename
):
2370 """Read a file and recursively flatten nested '##include' files."""
2372 current_dir
= os
.path
.dirname(filename
)
2374 contents
= open(filename
).read()
2376 error('Error including file "%s"' % filename
)
2378 self
.fileNameStack
.push(LineTracker(filename
))
2380 # Find any includes and include them
2381 def replace(matchobj
):
2382 return self
.replace_include(matchobj
, current_dir
)
2383 contents
= self
.includeRE
.sub(replace
, contents
)
2385 self
.fileNameStack
.pop()
2388 AlreadyGenerated
= {}
2390 def _parse_isa_desc(self
, isa_desc_file
):
2391 '''Read in and parse the ISA description.'''
2393 # The build system can end up running the ISA parser twice: once to
2394 # finalize the build dependencies, and then to actually generate
2395 # the files it expects (in src/arch/$ARCH/generated). This code
2396 # doesn't do anything different either time, however; the SCons
2397 # invocations just expect different things. Since this code runs
2398 # within SCons, we can just remember that we've already run and
2399 # not perform a completely unnecessary run, since the ISA parser's
2400 # effect is idempotent.
2401 if isa_desc_file
in ISAParser
.AlreadyGenerated
:
2404 # grab the last three path components of isa_desc_file
2405 self
.filename
= '/'.join(isa_desc_file
.split('/')[-3:])
2407 # Read file and (recursively) all included files into a string.
2408 # PLY requires that the input be in a single string so we have to
2410 isa_desc
= self
.read_and_flatten(isa_desc_file
)
2412 # Initialize lineno tracker
2413 self
.lex
.lineno
= LineTracker(isa_desc_file
)
2416 self
.parse_string(isa_desc
)
2418 ISAParser
.AlreadyGenerated
[isa_desc_file
] = None
2420 def parse_isa_desc(self
, *args
, **kwargs
):
2422 self
._parse
_isa
_desc
(*args
, **kwargs
)
2423 except ISAParserError
, e
:
2424 print backtrace(self
.fileNameStack
)
2425 print "At %s:" % e
.lineno
2429 # Called as script: get args from command line.
2430 # Args are: <isa desc file> <output dir>
2431 if __name__
== '__main__':
2432 ISAParser(sys
.argv
[2]).parse_isa_desc(sys
.argv
[1])