def __init__(self, file, show_comments=0):
"""Constructor. 'file' is the file object to output the
resulting code to. If 'show_comments' is true, then annotated
comments are produced for the generated assembly code."""
Visitor.__init__(self)
# The current label number we're on, for generating
# jump labels in the assembly code (e.g., 'LO', 'L1', etc).
self.__label = 0
# Current label number for generating string literal labels.
self.__str_literal_label = 0
# Current assembly code for string literals.
self.__str_literal_str = ""
# Whether we should show comments or not.
self.show_comments = show_comments
# The file we're outputting the generated code to.
self.file = file
# A hashtable of binary operators and the assembly
# instructions corresponding to them. Certain instructions
# are just the 'base' instruction and require a suffix
# corresponding to the size of the operands; for instance,
# addition can be accomplished with the 'addl' instruction
# for 32-bit integers and 'addb' for 8-bit integers.
#
# In such cases, the code adds the appropriate suffixes on its
# own.
self.binop_instructions = \
{ '==' : 'sete',
'!=' : 'setne',
'>=' : 'setge',
'<=' : 'setle',
'>' : 'setg',
'<' : 'setl',
'+' : 'add',
'-' : 'sub',
'*' : 'imul',
'=' : 'mov'
}
# Windows' C linkage prepends a '_' before symbol
# names, whereas Unix doesn't. This is particularly
# critical if the source file is linking to external
# libraries that we're not compiling. Figure out
# which one to use here.
import sys
if sys.platform == 'win32':
self.symbol_prepend = "_"
else:
self.symbol_prepend = ""
def __init__(self, file, show_comments=0):
"""Constructor. 'file' is the file object to output the
resulting code to. If 'show_comments' is true, then annotated
comments are produced for the generated assembly code."""
Visitor.__init__(self)
# The current label number we're on, for generating
# jump labels in the assembly code (e.g., 'LO', 'L1', etc).
self.__label = 0
# Current label number for generating string literal labels.
self.__str_literal_label = 0
# Current assembly code for string literals.
self.__str_literal_str = ""
# Whether we should show comments or not.
self.show_comments = show_comments
# The file we're outputting the generated code to.
self.file = file
# A hashtable of binary operators and the assembly
# instructions corresponding to them. Certain instructions
# are just the 'base' instruction and require a suffix
# corresponding to the size of the operands; for instance,
# addition can be accomplished with the 'addl' instruction
# for 32-bit integers and 'addb' for 8-bit integers.
#
# In such cases, the code adds the appropriate suffixes on its
# own.
self.binop_instructions = \
{ '==' : 'sete',
'!=' : 'setne',
'>=' : 'setge',
'<=' : 'setle',
'>' : 'setg',
'<' : 'setl',
'+' : 'add',
'-' : 'sub',
'*' : 'imul',
'=' : 'mov'
}
# Windows' C linkage prepends a '_' before symbol
# names, whereas Unix doesn't. This is particularly
# critical if the source file is linking to external
# libraries that we're not compiling. Figure out
# which one to use here.
import sys
if sys.platform == 'win32':
self.symbol_prepend = "_"
else:
self.symbol_prepend = ""
def __init__(self):
Visitor.__init__(self)
self.liveness_at_inst = {}
def __init__(self):
Visitor.__init__(self)
self.liveness_at_inst = {}
