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Add structure based bitfield syntax to the isa_parser. This is primarily useful for x86.

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--HG--
extra : convert_revision : dfe6df160d00adec1830d9b88520ba20834d1209
This commit is contained in:
Gabe Black 2007-03-22 04:10:57 +00:00
parent 39182808bc
commit e3d3ab4513
1 changed files with 15 additions and 7 deletions
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22
src/arch/isa_parser.py
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@ -81,12 +81,12 @@ tokens = reserved + (
# code literal
'CODELIT',
# ( ) [ ] { } < > , ; : :: *
# ( ) [ ] { } < > , ; . : :: *
'LPAREN', 'RPAREN',
'LBRACKET', 'RBRACKET',
'LBRACE', 'RBRACE',
'LESS', 'GREATER', 'EQUALS',
'COMMA', 'SEMI', 'COLON', 'DBLCOLON',
'COMMA', 'SEMI', 'DOT', 'COLON', 'DBLCOLON',
'ASTERISK',
# C preprocessor directives
@ -113,6 +113,7 @@ t_GREATER = r'\>'
t_EQUALS = r'='
t_COMMA = r','
t_SEMI = r';'
t_DOT = r'\.'
t_COLON = r':'
t_DBLCOLON = r'::'
t_ASTERISK = r'\*'
@ -261,6 +262,7 @@ def p_defs_and_outputs_1(t):
def p_def_or_output(t):
'''def_or_output : def_format
| def_bitfield
| def_bitfield_struct
| def_template
| def_operand_types
| def_operands
@ -364,15 +366,21 @@ def p_def_bitfield_1(t):
t[0] = GenCode(header_output = hash_define)
# alternate form for structure member: 'def bitfield <ID> <ID>'
def p_def_bitfield_2(t):
'def_bitfield : DEF nothing BITFIELD ID ID SEMI'
def p_def_bitfield_struct(t):
'def_bitfield_struct : DEF opt_signed BITFIELD ID id_with_dot SEMI'
if (t[2] != ''):
error(t.lineno(1), 'error: structure bitfields are always unsigned.')
expr = 'machInst.%s' % t[5]
hash_define = '#undef %s\n#define %s\t%s\n' % (t[4], t[4], expr)
t[0] = GenCode(header_output = hash_define)
def p_nothing(t):
'nothing : empty'
t[0] = ''
def p_id_with_dot_0(t):
'id_with_dot : ID'
t[0] = t[1]
def p_id_with_dot_1(t):
'id_with_dot : ID DOT id_with_dot'
t[0] = t[1] + t[2] + t[3]
def p_opt_signed_0(t):
'opt_signed : SIGNED'