| #! /usr/bin/env python |
| |
| # Copyright (c) 2003-2005 The Regents of The University of Michigan |
| # All rights reserved. |
| # |
| # Redistribution and use in source and binary forms, with or without |
| # modification, are permitted provided that the following conditions are |
| # met: redistributions of source code must retain the above copyright |
| # notice, this list of conditions and the following disclaimer; |
| # redistributions in binary form must reproduce the above copyright |
| # notice, this list of conditions and the following disclaimer in the |
| # documentation and/or other materials provided with the distribution; |
| # neither the name of the copyright holders nor the names of its |
| # contributors may be used to endorse or promote products derived from |
| # this software without specific prior written permission. |
| # |
| # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| import os |
| import sys |
| import re |
| import string |
| import traceback |
| # get type names |
| from types import * |
| |
| # Prepend the directory where the PLY lex & yacc modules are found |
| # to the search path. Assumes we're compiling in a subdirectory |
| # of 'build' in the current tree. |
| sys.path[0:0] = [os.environ['M5_EXT'] + '/ply'] |
| |
| import lex |
| import yacc |
| |
| ##################################################################### |
| # |
| # Lexer |
| # |
| # The PLY lexer module takes two things as input: |
| # - A list of token names (the string list 'tokens') |
| # - A regular expression describing a match for each token. The |
| # regexp for token FOO can be provided in two ways: |
| # - as a string variable named t_FOO |
| # - as the doc string for a function named t_FOO. In this case, |
| # the function is also executed, allowing an action to be |
| # associated with each token match. |
| # |
| ##################################################################### |
| |
| # Reserved words. These are listed separately as they are matched |
| # using the same regexp as generic IDs, but distinguished in the |
| # t_ID() function. The PLY documentation suggests this approach. |
| reserved = ( |
| 'BITFIELD', 'DECODE', 'DECODER', 'DEFAULT', 'DEF', 'EXEC', 'FORMAT', |
| 'HEADER', 'LET', 'NAMESPACE', 'OPERAND_TYPES', 'OPERANDS', |
| 'OUTPUT', 'SIGNED', 'TEMPLATE' |
| ) |
| |
| # List of tokens. The lex module requires this. |
| tokens = reserved + ( |
| # identifier |
| 'ID', |
| |
| # integer literal |
| 'INTLIT', |
| |
| # string literal |
| 'STRLIT', |
| |
| # code literal |
| 'CODELIT', |
| |
| # ( ) [ ] { } < > , ; : :: * |
| 'LPAREN', 'RPAREN', |
| # not used any more... commented out to suppress PLY warning |
| # 'LBRACKET', 'RBRACKET', |
| 'LBRACE', 'RBRACE', |
| 'LESS', 'GREATER', |
| 'COMMA', 'SEMI', 'COLON', 'DBLCOLON', |
| 'ASTERISK', |
| |
| # C preprocessor directives |
| 'CPPDIRECTIVE' |
| ) |
| |
| # Regular expressions for token matching |
| t_LPAREN = r'\(' |
| t_RPAREN = r'\)' |
| # not used any more... commented out to suppress PLY warning |
| # t_LBRACKET = r'\[' |
| # t_RBRACKET = r'\]' |
| t_LBRACE = r'\{' |
| t_RBRACE = r'\}' |
| t_LESS = r'\<' |
| t_GREATER = r'\>' |
| t_COMMA = r',' |
| t_SEMI = r';' |
| t_COLON = r':' |
| t_DBLCOLON = r'::' |
| t_ASTERISK = r'\*' |
| |
| # Identifiers and reserved words |
| reserved_map = { } |
| for r in reserved: |
| reserved_map[r.lower()] = r |
| |
| def t_ID(t): |
| r'[A-Za-z_]\w*' |
| t.type = reserved_map.get(t.value,'ID') |
| return t |
| |
| # Integer literal |
| def t_INTLIT(t): |
| r'(0x[\da-fA-F]+)|\d+' |
| try: |
| t.value = int(t.value,0) |
| except ValueError: |
| error(t.lineno, 'Integer value "%s" too large' % t.value) |
| t.value = 0 |
| return t |
| |
| # String literal. Note that these use only single quotes, and |
| # can span multiple lines. |
| def t_STRLIT(t): |
| r"(?m)'([^'])+'" |
| # strip off quotes |
| t.value = t.value[1:-1] |
| t.lineno += t.value.count('\n') |
| return t |
| |
| |
| # "Code literal"... like a string literal, but delimiters are |
| # '{{' and '}}' so they get formatted nicely under emacs c-mode |
| def t_CODELIT(t): |
| r"(?m)\{\{([^\}]|}(?!\}))+\}\}" |
| # strip off {{ & }} |
| t.value = t.value[2:-2] |
| t.lineno += t.value.count('\n') |
| return t |
| |
| def t_CPPDIRECTIVE(t): |
| r'^\#.*\n' |
| t.lineno += t.value.count('\n') |
| return t |
| |
| # |
| # The functions t_NEWLINE, t_ignore, and t_error are |
| # special for the lex module. |
| # |
| |
| # Newlines |
| def t_NEWLINE(t): |
| r'\n+' |
| t.lineno += t.value.count('\n') |
| |
| # Comments |
| def t_comment(t): |
| r'//.*' |
| |
| # Completely ignored characters |
| t_ignore = ' \t\x0c' |
| |
| # Error handler |
| def t_error(t): |
| error(t.lineno, "illegal character '%s'" % t.value[0]) |
| t.skip(1) |
| |
| # Build the lexer |
| lex.lex() |
| |
| ##################################################################### |
| # |
| # Parser |
| # |
| # Every function whose name starts with 'p_' defines a grammar rule. |
| # The rule is encoded in the function's doc string, while the |
| # function body provides the action taken when the rule is matched. |
| # The argument to each function is a list of the values of the |
| # rule's symbols: t[0] for the LHS, and t[1..n] for the symbols |
| # on the RHS. For tokens, the value is copied from the t.value |
| # attribute provided by the lexer. For non-terminals, the value |
| # is assigned by the producing rule; i.e., the job of the grammar |
| # rule function is to set the value for the non-terminal on the LHS |
| # (by assigning to t[0]). |
| ##################################################################### |
| |
| # The LHS of the first grammar rule is used as the start symbol |
| # (in this case, 'specification'). Note that this rule enforces |
| # that there will be exactly one namespace declaration, with 0 or more |
| # global defs/decls before and after it. The defs & decls before |
| # the namespace decl will be outside the namespace; those after |
| # will be inside. The decoder function is always inside the namespace. |
| def p_specification(t): |
| 'specification : opt_defs_and_outputs name_decl opt_defs_and_outputs decode_block' |
| global_code = t[1] |
| isa_name = t[2] |
| namespace = isa_name + "Inst" |
| # wrap the decode block as a function definition |
| t[4].wrap_decode_block(''' |
| StaticInstPtr<%(isa_name)s> |
| %(isa_name)s::decodeInst(%(isa_name)s::MachInst machInst) |
| { |
| using namespace %(namespace)s; |
| ''' % vars(), '}') |
| # both the latter output blocks and the decode block are in the namespace |
| namespace_code = t[3] + t[4] |
| # pass it all back to the caller of yacc.parse() |
| t[0] = (isa_name, namespace, global_code, namespace_code) |
| |
| # ISA name declaration looks like "namespace <foo>;" |
| def p_name_decl(t): |
| 'name_decl : NAMESPACE ID SEMI' |
| t[0] = t[2] |
| |
| # 'opt_defs_and_outputs' is a possibly empty sequence of |
| # def and/or output statements. |
| def p_opt_defs_and_outputs_0(t): |
| 'opt_defs_and_outputs : empty' |
| t[0] = GenCode() |
| |
| def p_opt_defs_and_outputs_1(t): |
| 'opt_defs_and_outputs : defs_and_outputs' |
| t[0] = t[1] |
| |
| def p_defs_and_outputs_0(t): |
| 'defs_and_outputs : def_or_output' |
| t[0] = t[1] |
| |
| def p_defs_and_outputs_1(t): |
| 'defs_and_outputs : defs_and_outputs def_or_output' |
| t[0] = t[1] + t[2] |
| |
| # The list of possible definition/output statements. |
| def p_def_or_output(t): |
| '''def_or_output : def_format |
| | def_bitfield |
| | def_template |
| | def_operand_types |
| | def_operands |
| | output_header |
| | output_decoder |
| | output_exec |
| | global_let''' |
| t[0] = t[1] |
| |
| # Output blocks 'output <foo> {{...}}' (C++ code blocks) are copied |
| # directly to the appropriate output section. |
| |
| |
| # Protect any non-dict-substitution '%'s in a format string |
| # (i.e. those not followed by '(') |
| def protect_non_subst_percents(s): |
| return re.sub(r'%(?!\()', '%%', s) |
| |
| # Massage output block by substituting in template definitions and bit |
| # operators. We handle '%'s embedded in the string that don't |
| # indicate template substitutions (or CPU-specific symbols, which get |
| # handled in GenCode) by doubling them first so that the format |
| # operation will reduce them back to single '%'s. |
| def process_output(s): |
| s = protect_non_subst_percents(s) |
| # protects cpu-specific symbols too |
| s = protect_cpu_symbols(s) |
| return substBitOps(s % templateMap) |
| |
| def p_output_header(t): |
| 'output_header : OUTPUT HEADER CODELIT SEMI' |
| t[0] = GenCode(header_output = process_output(t[3])) |
| |
| def p_output_decoder(t): |
| 'output_decoder : OUTPUT DECODER CODELIT SEMI' |
| t[0] = GenCode(decoder_output = process_output(t[3])) |
| |
| def p_output_exec(t): |
| 'output_exec : OUTPUT EXEC CODELIT SEMI' |
| t[0] = GenCode(exec_output = process_output(t[3])) |
| |
| # global let blocks 'let {{...}}' (Python code blocks) are executed |
| # directly when seen. Note that these execute in a special variable |
| # context 'exportContext' to prevent the code from polluting this |
| # script's namespace. |
| def p_global_let(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])) |
| t[0] = GenCode() # contributes nothing to the output C++ file |
| |
| # 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' |
| s = 'global operandTypeMap; operandTypeMap = {' + t[3] + '}' |
| try: |
| exec s |
| except Exception, exc: |
| error(t.lineno(1), |
| 'error: %s in def operand_types block "%s".' % (exc, t[3])) |
| t[0] = GenCode() # contributes nothing to the output C++ file |
| |
| # Define the mapping from operand names to operand classes and other |
| # traits. Stored in operandTraitsMap. |
| def p_def_operands(t): |
| 'def_operands : DEF OPERANDS CODELIT SEMI' |
| s = 'global operandTraitsMap; operandTraitsMap = {' + t[3] + '}' |
| try: |
| exec s |
| except Exception, exc: |
| error(t.lineno(1), |
| 'error: %s in def operands block "%s".' % (exc, t[3])) |
| defineDerivedOperandVars() |
| 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]) |
| if (t[2] == 'signed'): |
| expr = 'sext<%d>(%s)' % (t[6] - t[8] + 1, expr) |
| hash_define = '#undef %s\n#define %s\t%s\n' % (t[4], t[4], expr) |
| t[0] = GenCode(header_output = hash_define) |
| |
| # alternate form for single bit: 'def [signed] bitfield <ID> [<bit>]' |
| def p_def_bitfield_1(t): |
| 'def_bitfield : DEF opt_signed BITFIELD ID LESS INTLIT GREATER SEMI' |
| expr = 'bits(machInst, %2d, %2d)' % (t[6], t[6]) |
| if (t[2] == 'signed'): |
| expr = 'sext<%d>(%s)' % (1, expr) |
| hash_define = '#undef %s\n#define %s\t%s\n' % (t[4], t[4], expr) |
| t[0] = GenCode(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). |
| |
| class Stack: |
| def __init__(self, initItem): |
| self.stack = [ initItem ] |
| |
| def push(self, item): |
| self.stack.append(item); |
| |
| def pop(self): |
| return self.stack.pop() |
| |
| def top(self): |
| return self.stack[-1] |
| |
| # The global format stack. |
| formatStack = Stack(NoFormat()) |
| |
| # The global default case stack. |
| defaultStack = Stack( None ) |
| |
| ################### |
| # Utility functions |
| |
| # |
| # Indent every line in string 's' by two spaces |
| # (except preprocessor directives). |
| # Used to make nested code blocks look pretty. |
| # |
| def indent(s): |
| return re.sub(r'(?m)^(?!\#)', ' ', s) |
| |
| # |
| # Munge a somewhat arbitrarily formatted piece of Python code |
| # (e.g. from a format 'let' block) into something whose indentation |
| # will get by the Python parser. |
| # |
| # The two keys here are that Python will give a syntax error if |
| # there's any whitespace at the beginning of the first line, and that |
| # all lines at the same lexical nesting level must have identical |
| # indentation. Unfortunately the way code literals work, an entire |
| # let block tends to have some initial indentation. Rather than |
| # trying to figure out what that is and strip it off, we prepend 'if |
| # 1:' to make the let code the nested block inside the if (and have |
| # the parser automatically deal with the indentation for us). |
| # |
| # We don't want to do this if (1) the code block is empty or (2) the |
| # first line of the block doesn't have any whitespace at the front. |
| |
| def fixPythonIndentation(s): |
| # get rid of blank lines first |
| s = re.sub(r'(?m)^\s*\n', '', s); |
| if (s != '' and re.match(r'[ \t]', s[0])): |
| s = 'if 1:\n' + s |
| return s |
| |
| # Error handler. Just call exit. Output formatted to work under |
| # Emacs compile-mode. |
| def error(lineno, string): |
| sys.exit("%s:%d: %s" % (input_filename, lineno, string)) |
| |
| # Like error(), but include a Python stack backtrace (for processing |
| # Python exceptions). |
| def error_bt(lineno, string): |
| traceback.print_exc() |
| print >> sys.stderr, "%s:%d: %s" % (input_filename, lineno, string) |
| sys.exit(1) |
| |
| |
| ##################################################################### |
| # |
| # Bitfield Operator Support |
| # |
| ##################################################################### |
| |
| bitOp1ArgRE = re.compile(r'<\s*(\w+)\s*:\s*>') |
| |
| bitOpWordRE = re.compile(r'(?<![\w\.])([\w\.]+)<\s*(\w+)\s*:\s*(\w+)\s*>') |
| bitOpExprRE = re.compile(r'\)<\s*(\w+)\s*:\s*(\w+)\s*>') |
| |
| def substBitOps(code): |
| # first convert single-bit selectors to two-index form |
| # i.e., <n> --> <n:n> |
| code = bitOp1ArgRE.sub(r'<\1:\1>', code) |
| # simple case: selector applied to ID (name) |
| # i.e., foo<a:b> --> bits(foo, a, b) |
| code = bitOpWordRE.sub(r'bits(\1, \2, \3)', code) |
| # if selector is applied to expression (ending in ')'), |
| # we need to search backward for matching '(' |
| match = bitOpExprRE.search(code) |
| while match: |
| exprEnd = match.start() |
| here = exprEnd - 1 |
| nestLevel = 1 |
| while nestLevel > 0: |
| if code[here] == '(': |
| nestLevel -= 1 |
| elif code[here] == ')': |
| nestLevel += 1 |
| here -= 1 |
| if here < 0: |
| sys.exit("Didn't find '('!") |
| exprStart = here+1 |
| newExpr = r'bits(%s, %s, %s)' % (code[exprStart:exprEnd+1], |
| match.group(1), match.group(2)) |
| code = code[:exprStart] + newExpr + code[match.end():] |
| match = bitOpExprRE.search(code) |
| return code |
| |
| |
| #################### |
| # Template objects. |
| # |
| # Template objects are format strings that allow substitution from |
| # the attribute spaces of other objects (e.g. InstObjParams instances). |
| |
| class Template: |
| def __init__(self, t): |
| self.template = t |
| |
| def subst(self, d): |
| # Start with the template namespace. Make a copy since we're |
| # going to modify it. |
| myDict = templateMap.copy() |
| # if the argument is a dictionary, we just use it. |
| if isinstance(d, dict): |
| myDict.update(d) |
| # if the argument is an object, we use its attribute map. |
| elif hasattr(d, '__dict__'): |
| myDict.update(d.__dict__) |
| else: |
| raise TypeError, "Template.subst() arg must be or have dictionary" |
| # 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.munged_name + ' = 0;\n'; |
| |
| class IntRegOperandTraits(OperandTraits): |
| def isReg(self): |
| return 1 |
| |
| def isIntReg(self): |
| return 1 |
| |
| def makeConstructor(self, op_desc): |
| c = '' |
| if op_desc.is_src: |
| c += '\n\t_srcRegIdx[%d] = %s;' % \ |
| (op_desc.src_reg_idx, self.reg_spec) |
| if op_desc.is_dest: |
| c += '\n\t_destRegIdx[%d] = %s;' % \ |
| (op_desc.dest_reg_idx, self.reg_spec) |
| return c |
| |
| def makeRead(self, op_desc): |
| (size, type, is_signed) = operandSizeMap[op_desc.eff_ext] |
| if (type == 'float' or type == 'double'): |
| error(0, 'Attempt to read integer register as FP') |
| if (size == self.dflt_size): |
| return '%s = xc->readIntReg(this, %d);\n' % \ |
| (op_desc.munged_name, op_desc.src_reg_idx) |
| else: |
| return '%s = bits(xc->readIntReg(this, %d), %d, 0);\n' % \ |
| (op_desc.munged_name, op_desc.src_reg_idx, size-1) |
| |
| def makeWrite(self, op_desc): |
| (size, type, is_signed) = operandSizeMap[op_desc.eff_ext] |
| if (type == 'float' or type == 'double'): |
| error(0, 'Attempt to write integer register as FP') |
| if (size != self.dflt_size and is_signed): |
| final_val = 'sext<%d>(%s)' % (size, op_desc.munged_name) |
| else: |
| final_val = op_desc.munged_name |
| wb = ''' |
| { |
| %s final_val = %s; |
| xc->setIntReg(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.munged_name, base, size-1) |
| else: |
| return '%s = %s;\n' % (op_desc.munged_name, base) |
| |
| def makeWrite(self, op_desc): |
| (size, type, is_signed) = operandSizeMap[op_desc.eff_ext] |
| final_val = op_desc.munged_name |
| if (type == 'float'): |
| func = 'setFloatRegSingle' |
| elif (type == 'double'): |
| func = 'setFloatRegDouble' |
| else: |
| func = 'setFloatRegInt' |
| type = 'uint%d_t' % self.dflt_size |
| if (size != self.dflt_size and is_signed): |
| final_val = 'sext<%d>(%s)' % (size, op_desc.munged_name) |
| wb = ''' |
| { |
| %s final_val = %s; |
| xc->%s(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.munged_name, base) |
| else: |
| return '%s = bits(%s, %d, 0);\n' % \ |
| (op_desc.munged_name, base, size-1) |
| |
| def makeWrite(self, op_desc): |
| (size, type, is_signed) = operandSizeMap[op_desc.eff_ext] |
| if (type == 'float' or type == 'double'): |
| error(0, 'Attempt to write control register as FP') |
| wb = 'xc->set%s(%s);\n' % (self.reg_spec, op_desc.munged_name) |
| wb += 'if (traceData) { traceData->setData(%s); }' % \ |
| op_desc.munged_name |
| return wb |
| |
| class MemOperandTraits(OperandTraits): |
| def isMem(self): |
| return 1 |
| |
| def makeConstructor(self, op_desc): |
| return '' |
| |
| def makeDecl(self, op_desc): |
| (size, type, is_signed) = operandSizeMap[op_desc.eff_ext] |
| # Note that initializations in the declarations are solely |
| # to avoid 'uninitialized variable' errors from the compiler. |
| # Declare memory data variable. |
| c = '%s %s = 0;\n' % (type, op_desc.munged_name) |
| # Declare var to hold memory access flags. |
| c += 'unsigned %s_flags = memAccessFlags;\n' % op_desc.base_name |
| # If this operand is a dest (i.e., it's a store operation), |
| # then we need to declare a variable for the write result code |
| # as well. |
| if op_desc.is_dest: |
| c += 'uint64_t %s_write_result = 0;\n' % op_desc.base_name |
| return c |
| |
| def makeRead(self, op_desc): |
| (size, type, is_signed) = operandSizeMap[op_desc.eff_ext] |
| eff_type = 'uint%d_t' % size |
| return 'fault = xc->read(EA, (%s&)%s, %s_flags);\n' \ |
| % (eff_type, op_desc.munged_name, op_desc.base_name) |
| |
| def makeWrite(self, op_desc): |
| (size, type, is_signed) = operandSizeMap[op_desc.eff_ext] |
| eff_type = 'uint%d_t' % size |
| wb = 'fault = xc->write((%s&)%s, EA, %s_flags, &%s_write_result);\n' \ |
| % (eff_type, op_desc.munged_name, op_desc.base_name, |
| op_desc.base_name) |
| wb += 'if (traceData) { traceData->setData(%s); }' % \ |
| op_desc.munged_name |
| return wb |
| |
| class NPCOperandTraits(OperandTraits): |
| def makeConstructor(self, op_desc): |
| return '' |
| |
| def makeRead(self, op_desc): |
| return '%s = xc->readPC() + 4;\n' % op_desc.munged_name |
| |
| def makeWrite(self, op_desc): |
| return 'xc->setNextPC(%s);\n' % op_desc.munged_name |
| |
| |
| exportContextSymbols = ('IntRegOperandTraits', 'FloatRegOperandTraits', |
| 'ControlRegOperandTraits', 'MemOperandTraits', |
| 'NPCOperandTraits', 'InstObjParams', 'CodeBlock', |
| 're', 'string') |
| |
| exportContext = {} |
| |
| def updateExportContext(): |
| exportContext.update(exportDict(*exportContextSymbols)) |
| exportContext.update(templateMap) |
| |
| |
| def exportDict(*symNames): |
| return dict([(s, eval(s)) for s in symNames]) |
| |
| |
| # |
| # Define operand variables that get derived from the basic declaration |
| # of ISA-specific operands in operandTraitsMap. This function must be |
| # called by the ISA description file explicitly after defining |
| # operandTraitsMap (in a 'let' block). |
| # |
| def defineDerivedOperandVars(): |
| global operands |
| operands = operandTraitsMap.keys() |
| |
| operandsREString = (r''' |
| (?<![\w\.]) # neg. lookbehind assertion: prevent partial matches |
| ((%s)(?:\.(\w+))?) # match: operand with optional '.' then suffix |
| (?![\w\.]) # neg. lookahead assertion: prevent partial matches |
| ''' |
| % string.join(operands, '|')) |
| |
| global operandsRE |
| operandsRE = re.compile(operandsREString, re.MULTILINE|re.VERBOSE) |
| |
| # Same as operandsREString, but extension is mandatory, and only two |
| # groups are returned (base and ext, not full name as above). |
| # Used for subtituting '_' for '.' to make C++ identifiers. |
| operandsWithExtREString = (r'(?<![\w\.])(%s)\.(\w+)(?![\w\.])' |
| % string.join(operands, '|')) |
| |
| global operandsWithExtRE |
| operandsWithExtRE = re.compile(operandsWithExtREString, re.MULTILINE) |
| |
| |
| # |
| # Operand descriptor class. An instance of this class represents |
| # a specific operand for a code block. |
| # |
| class OperandDescriptor: |
| def __init__(self, full_name, base_name, ext, is_src, is_dest): |
| self.full_name = full_name |
| self.base_name = base_name |
| self.ext = ext |
| self.is_src = is_src |
| self.is_dest = is_dest |
| self.traits = operandTraitsMap[base_name] |
| # The 'effective extension' (eff_ext) is either the actual |
| # extension, if one was explicitly provided, or the default. |
| # The 'munged name' replaces the '.' between the base and |
| # extension (if any) with a '_' to make a legal C++ variable name. |
| if ext: |
| self.eff_ext = ext |
| self.munged_name = base_name + '_' + ext |
| else: |
| self.eff_ext = self.traits.dflt_ext |
| self.munged_name = base_name |
| |
| # Finalize additional fields (primarily code fields). This step |
| # is done separately since some of these fields may depend on the |
| # register index enumeration that hasn't been performed yet at the |
| # time of __init__(). |
| def finalize(self): |
| self.flags = self.traits.getFlags(self) |
| self.constructor = self.traits.makeConstructor(self) |
| self.op_decl = self.traits.makeDecl(self) |
| |
| if self.is_src: |
| self.op_rd = self.traits.makeRead(self) |
| else: |
| self.op_rd = '' |
| |
| if self.is_dest: |
| self.op_wb = self.traits.makeWrite(self) |
| else: |
| self.op_wb = '' |
| |
| class OperandDescriptorList: |
| def __init__(self): |
| self.items = [] |
| self.bases = {} |
| |
| def __len__(self): |
| return len(self.items) |
| |
| def __getitem__(self, index): |
| return self.items[index] |
| |
| def append(self, op_desc): |
| self.items.append(op_desc) |
| self.bases[op_desc.base_name] = op_desc |
| |
| def find_base(self, base_name): |
| # like self.bases[base_name], but returns None if not found |
| # (rather than raising exception) |
| return self.bases.get(base_name) |
| |
| # internal helper function for concat[Some]Attr{Strings|Lists} |
| def __internalConcatAttrs(self, attr_name, filter, result): |
| for op_desc in self.items: |
| if filter(op_desc): |
| result += getattr(op_desc, attr_name) |
| return result |
| |
| # return a single string that is the concatenation of the (string) |
| # values of the specified attribute for all operands |
| def concatAttrStrings(self, attr_name): |
| return self.__internalConcatAttrs(attr_name, lambda x: 1, '') |
| |
| # like concatAttrStrings, but only include the values for the operands |
| # for which the provided filter function returns true |
| def concatSomeAttrStrings(self, filter, attr_name): |
| return self.__internalConcatAttrs(attr_name, filter, '') |
| |
| # return a single list that is the concatenation of the (list) |
| # values of the specified attribute for all operands |
| def concatAttrLists(self, attr_name): |
| return self.__internalConcatAttrs(attr_name, lambda x: 1, []) |
| |
| # like concatAttrLists, but only include the values for the operands |
| # for which the provided filter function returns true |
| def concatSomeAttrLists(self, filter, attr_name): |
| return self.__internalConcatAttrs(attr_name, filter, []) |
| |
| def sort(self): |
| self.items.sort(lambda a, b: a.traits.sort_pri - b.traits.sort_pri) |
| |
| # Regular expression object to match C++ comments |
| # (used in findOperands()) |
| commentRE = re.compile(r'//.*\n') |
| |
| # Regular expression object to match assignment statements |
| # (used in findOperands()) |
| assignRE = re.compile(r'\s*=(?!=)', re.MULTILINE) |
| |
| # |
| # Find all the operands in the given code block. Returns an operand |
| # descriptor list (instance of class OperandDescriptorList). |
| # |
| def findOperands(code): |
| operands = OperandDescriptorList() |
| # delete comments so we don't accidentally match on reg specifiers inside |
| code = commentRE.sub('', code) |
| # search for operands |
| next_pos = 0 |
| while 1: |
| match = operandsRE.search(code, next_pos) |
| if not match: |
| # no more matches: we're done |
| break |
| op = match.groups() |
| # regexp groups are operand full name, base, and extension |
| (op_full, op_base, op_ext) = op |
| # if the token following the operand is an assignment, this is |
| # a destination (LHS), else it's a source (RHS) |
| is_dest = (assignRE.match(code, match.end()) != None) |
| is_src = not is_dest |
| # see if we've already seen this one |
| op_desc = operands.find_base(op_base) |
| if op_desc: |
| if op_desc.ext != op_ext: |
| error(0, 'Inconsistent extensions for operand %s' % op_base) |
| op_desc.is_src = op_desc.is_src or is_src |
| op_desc.is_dest = op_desc.is_dest or is_dest |
| else: |
| # new operand: create new descriptor |
| op_desc = OperandDescriptor(op_full, op_base, op_ext, |
| is_src, is_dest) |
| operands.append(op_desc) |
| # start next search after end of current match |
| next_pos = match.end() |
| operands.sort() |
| # enumerate source & dest register operands... used in building |
| # constructor later |
| srcRegs = 0 |
| destRegs = 0 |
| operands.numFPDestRegs = 0 |
| operands.numIntDestRegs = 0 |
| for op_desc in operands: |
| if op_desc.traits.isReg(): |
| if op_desc.is_src: |
| op_desc.src_reg_idx = srcRegs |
| srcRegs += 1 |
| if op_desc.is_dest: |
| op_desc.dest_reg_idx = destRegs |
| destRegs += 1 |
| if op_desc.traits.isFloatReg(): |
| operands.numFPDestRegs += 1 |
| elif op_desc.traits.isIntReg(): |
| operands.numIntDestRegs += 1 |
| operands.numSrcRegs = srcRegs |
| operands.numDestRegs = destRegs |
| # now make a final pass to finalize op_desc fields that may depend |
| # on the register enumeration |
| for op_desc in operands: |
| op_desc.finalize() |
| return operands |
| |
| # Munge operand names in code string to make legal C++ variable names. |
| # (Will match munged_name attribute of OperandDescriptor object.) |
| def substMungedOpNames(code): |
| return operandsWithExtRE.sub(r'\1_\2', code) |
| |
| def joinLists(t): |
| return map(string.join, t) |
| |
| def makeFlagConstructor(flag_list): |
| if len(flag_list) == 0: |
| return '' |
| # filter out repeated flags |
| flag_list.sort() |
| i = 1 |
| while i < len(flag_list): |
| if flag_list[i] == flag_list[i-1]: |
| del flag_list[i] |
| else: |
| i += 1 |
| pre = '\n\tflags[' |
| post = '] = true;' |
| code = pre + string.join(flag_list, post + pre) + post |
| return code |
| |
| class CodeBlock: |
| def __init__(self, code): |
| self.orig_code = code |
| self.operands = findOperands(code) |
| self.code = substMungedOpNames(substBitOps(code)) |
| self.constructor = self.operands.concatAttrStrings('constructor') |
| self.constructor += \ |
| '\n\t_numSrcRegs = %d;' % self.operands.numSrcRegs |
| self.constructor += \ |
| '\n\t_numDestRegs = %d;' % self.operands.numDestRegs |
| self.constructor += \ |
| '\n\t_numFPDestRegs = %d;' % self.operands.numFPDestRegs |
| self.constructor += \ |
| '\n\t_numIntDestRegs = %d;' % self.operands.numIntDestRegs |
| |
| self.op_decl = self.operands.concatAttrStrings('op_decl') |
| |
| is_mem = lambda op: op.traits.isMem() |
| not_mem = lambda op: not op.traits.isMem() |
| |
| self.op_rd = self.operands.concatAttrStrings('op_rd') |
| self.op_wb = self.operands.concatAttrStrings('op_wb') |
| self.op_mem_rd = \ |
| self.operands.concatSomeAttrStrings(is_mem, 'op_rd') |
| self.op_mem_wb = \ |
| self.operands.concatSomeAttrStrings(is_mem, 'op_wb') |
| self.op_nonmem_rd = \ |
| self.operands.concatSomeAttrStrings(not_mem, 'op_rd') |
| self.op_nonmem_wb = \ |
| self.operands.concatSomeAttrStrings(not_mem, 'op_wb') |
| |
| self.flags = self.operands.concatAttrLists('flags') |
| |
| # Make a basic guess on the operand class (function unit type). |
| # These are good enough for most cases, and will be overridden |
| # later otherwise. |
| if 'IsStore' in self.flags: |
| self.op_class = '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() |
| |
| # |
| # Read in and parse the ISA description. |
| # |
| def parse_isa_desc(isa_desc_file, output_dir, include_path): |
| # set a global var for the input filename... used in error messages |
| global input_filename |
| input_filename = isa_desc_file |
| |
| # Suck the ISA description file in. |
| input = open(isa_desc_file) |
| isa_desc = input.read() |
| input.close() |
| |
| # Parse it. |
| (isa_name, namespace, global_code, namespace_code) = yacc.parse(isa_desc) |
| |
| # grab the last three path components of isa_desc_file to put in |
| # the output |
| filename = '/'.join(isa_desc_file.split('/')[-3:]) |
| |
| # generate decoder.hh |
| includes = '#include "base/bitfield.hh" // for bitfield support' |
| global_output = global_code.header_output |
| namespace_output = namespace_code.header_output |
| update_if_needed(output_dir + '/decoder.hh', file_template % vars()) |
| |
| # generate decoder.cc |
| includes = '#include "%s/decoder.hh"' % include_path |
| global_output = global_code.decoder_output |
| namespace_output = namespace_code.decoder_output |
| namespace_output += namespace_code.decode_block |
| update_if_needed(output_dir + '/decoder.cc', file_template % vars()) |
| |
| # generate per-cpu exec files |
| for cpu in CpuModel.list: |
| includes = '#include "%s/decoder.hh"\n' % include_path |
| includes += cpu.includes |
| global_output = global_code.exec_output[cpu.name] |
| namespace_output = namespace_code.exec_output[cpu.name] |
| update_if_needed(output_dir + '/' + cpu.filename, |
| file_template % vars()) |
| |
| # Called as script: get args from command line. |
| if __name__ == '__main__': |
| parse_isa_desc(sys.argv[1], sys.argv[2], sys.argv[3]) |
