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sinclairrf |
################################################################################
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#
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# Copyright 2012, Sinclair R.F., Inc.
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#
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# Collection of utilities for the assembler.
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#
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################################################################################
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import os
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import re
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class AsmException(Exception):
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"""
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Exception class for the assembler.\n
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This allows the top-level module to capture error messages other than internal
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errors and program bugs so that users see a single-line error relevant to
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their code rather than the usual Python mess.
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"""
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def __init__(self,message):
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self.msg = message;
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def __str__(self):
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return self.msg;
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class FileBodyIterator:
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"""
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Iterator for files that returns bodies of lines of the file.\n
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The directive must be the first non-white spaces on a line.\n
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The iterator outputs a list whos first element is the line number for the
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first line of the block and whose subsequent elements are the lines with the
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content of the block.\n
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The iterator handles the ".include" directive.
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"""
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def __init__(self, fps, ad):
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"""
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Initialize the iterator.\n
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fps list of file pointers from the argument line
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ad asmDef_9x8 object (required to identify the directives)
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"""
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# Do sanity check on arguments.
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if ad.IsDirective(".include"):
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raise Exception('Program Bug: The ".include" directive is defined by FileBodyIterator');
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# Initialize the raw processing states
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self.ixConstants = 0;
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self.fpPending = list(fps);
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self.ad = ad;
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self.current = list();
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self.pending = list();
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# Initialize the include search paths
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self.searchPaths = list();
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self.searchPaths.append('.');
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# Prepare the file parsing
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self.included = list();
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for fp in self.fpPending:
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if fp.name in self.included:
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raise AsmException('Input file %s listed more than once' % fp.name);
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self.included.append(fp.name);
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self.fpStack = list();
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self.fpStack.append(dict(fp=self.fpPending.pop(0), line=0));
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self.pendingInclude = None;
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def __iter__(self):
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"""
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Required function for an iterable object.
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"""
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return self;
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def next(self):
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"""
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Return the next directive body from the iterator.\n
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The body is a list with the following content:
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the name of the file
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the line number for the first line of the body
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the body consisting of lines from the source file\n
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The body contains comment lines preceding the directive, the line with the
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directive, and optional lines following the directive up to the optional
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comments preceding the next directive.
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"""
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# Discard the body emitted by the previous call.
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self.current = self.pending;
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self.pending = list();
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# If the current body is an include directive, then process it immediately.
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if self.current and re.match(r'\s*\.include\b',self.current[-1]):
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return self.current;
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# Loop until all of the files have been processed
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while self.fpStack or self.fpPending or self.pendingInclude:
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# Indicate when a new file is started.
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if 'started' not in self.fpStack[-1]:
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if not self.current:
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self.fpStack[-1]['started'] = True;
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self.current.append(self.fpStack[-1]['fp'].name);
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self.current.append(0);
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return self.current;
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# Ensure the bodies in closed files are all emitted before continuing to
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# the next/enclosing file.
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if 'closed' in self.fpStack[-1]:
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# Provide end-of-file indication if there is not a pending body fragment.
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if not self.current:
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self.current.append(self.fpStack[-1]['fp'].name);
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self.current.append(-1);
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self.fpStack.pop();
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return self.current;
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# Handle a queued ".include" directive.
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if self.pendingInclude:
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# Don't open the include file until all previous content has been emitted.
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if self.current:
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return self.current;
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self.included.append(self.pendingInclude);
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fp_pending = None;
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for path in self.searchPaths:
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fullInclude = os.path.join(path,self.pendingInclude);
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if os.path.exists(fullInclude):
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11 |
sinclairrf |
fp_pending = open('%s/%s' % (path,self.pendingInclude),'rt');
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2 |
sinclairrf |
break;
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else:
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raise AsmException('%s not found' % self.pendingInclude);
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self.fpStack.append(dict(fp=fp_pending, line=0));
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self.pendingInclude = None;
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# Provide start-of-file indication.
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self.fpStack[-1]['started'] = True;
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self.current.append(fp_pending.name);
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self.current.append(0);
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return self.current;
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# Get the next file to process if fpStack is empty.
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if not self.fpStack:
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self.fpStack.append(dict(fp=self.fpPending.pop(0), line=0));
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# Process/continue processing the top file.
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fp = self.fpStack[-1];
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for line in fp['fp']:
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fp['line'] += 1;
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# Handle single-line directives.
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if re.match(r'\s*\.(IFDEF|IFNDEF|ELSE|ENDIF|include)\b',line):
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if not self.pending:
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self.pending.append(fp['fp'].name);
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self.pending.append(fp['line']);
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self.pending.append(line);
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if not self.current:
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self.current = self.pending;
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self.pending = list();
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return self.current;
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# Append empty and comment lines to the pending block.
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if re.match(r'\s*(;|$)', line):
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if not self.pending:
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self.pending.append(fp['fp'].name);
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self.pending.append(fp['line']);
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self.pending.append(line);
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continue;
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# See if the line starts with a directive.
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tokens = re.findall(r'\s*(\S+)',line);
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if self.ad.IsDirective(tokens[0]):
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if not self.pending:
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self.pending.append(fp['fp'].name);
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self.pending.append(fp['line']);
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self.pending.append(line);
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if self.current:
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return self.current;
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self.current = self.pending;
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self.pending = list();
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continue;
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# Otherwise, this line belongs to the body of the preceding directive.
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sinclairrf |
if not self.pending:
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self.pending.append(fp['fp'].name);
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self.pending.append(fp['line']);
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sinclairrf |
if not self.current:
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self.current += self.pending[0:2];
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self.current += self.pending[2:];
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self.current.append(line);
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self.pending = list();
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# Past the last line of the current file -- close it.
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self.fpStack[-1]['fp'].close();
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self.fpStack[-1]['closed'] = True;
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# Prepare to emit pending bodies if any.
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if not self.current:
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self.current = self.pending;
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self.pending = list();
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raise StopIteration;
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def AddSearchPath(self,path):
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"""
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Use by the top level assembler to add search paths for opening included
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files.
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"""
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self.searchPaths.append(path);
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def Include(self,filename):
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self.pendingInclude = filename;
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################################################################################
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#
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# Parse strings into the desired types.
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#
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################################################################################
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def ParseNumber(inString):
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"""
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Test for recognized integer values and return the value if recognized,
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otherwise return None.
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"""
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# look for single-digit 0
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if inString == '0':
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return 0;
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5 |
sinclairrf |
# look for a binary value
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a = re.match(r'0b[01_]+$',inString);
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if a:
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b = re.sub(r'_','',a.group(0)[2:]);
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return int(b,2);
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# look for an octal value
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a = re.match(r'0[0-7_]+$',inString);
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if a:
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return int(a.group(0)[1:],8);
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2 |
sinclairrf |
# look for decimal value
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sinclairrf |
a = re.match(r'[+\-]?[1-9_]\d*$',inString);
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2 |
sinclairrf |
if a:
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return int(a.group(0),10);
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# look for a hex value
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5 |
sinclairrf |
a = re.match(r'0x[0-9A-Fa-f_]+$',inString);
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2 |
sinclairrf |
if a:
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5 |
sinclairrf |
return int(a.group(0)[2:],16);
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2 |
sinclairrf |
# Everything else is an error
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return None;
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def ParseChar(inchar):
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"""
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Parse single characters including escaped characters. Return the character
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value and the number of characters in the input string matched.
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"""
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if re.match(r'\\[0-7]{3}',inchar):
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return (int(inchar[1:4],8),4,);
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elif re.match(r'\\[0-7]{2}',inchar):
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return (int(inchar[1:3],8),3,);
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elif re.match(r'\\[0-7]{1}',inchar):
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return (int(inchar[1],8),2,);
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elif re.match(r'\\[xX][0-9A-Fa-f]{2}',inchar):
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return (int(inchar[2:4],16),4,);
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elif re.match(r'\\[xX][0-9A-Fa-f]{1}',inchar):
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return (int(inchar[2],16),3,);
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elif re.match(r'\\.',inchar):
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if inchar[1] == 'a': # bell ==> control-G
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return (7,2,);
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elif inchar[1] == 'b': # backspace ==> control-H
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return (8,2,);
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elif inchar[1] == 'f': # form feed ==> control-L
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return (12,2,);
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elif inchar[1] == 'n': # line feed ==> control-J
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return (10,2,);
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elif inchar[1] == 'r': # carriage return ==> control-M
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return (13,2,);
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elif inchar[1] == 't': # horizontal tab ==> control-I
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return (9,2,);
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else: # unrecognized escaped character ==> return that character
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return (ord(inchar[1]),2,);
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else:
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return (ord(inchar[0]),1,);
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def ParseString(inString):
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"""
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Parse strings recognized by the assembler.\n
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A string consists of the following:
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an optional count/termination character -- one of CNc
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a starting double-quote character
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the body of the string including escape sequences
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a terminating double-quote character
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Errors are indicated by returning the location (an integer) within the string
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where the error occurs.
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"""
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# Detect optional count/termination character.
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ix = 1 if inString[0] in 'CNc' else 0;
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# Ensure the required start double quote is preset.
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if inString[ix] != '"' or inString[-1] != '"':
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raise Exception('Program Bug -- missing one or more double quotes around string');
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ix = ix + 1;
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# Convert the characters and escape sequences in the string to a list of their
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# integer values.
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outString = list();
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while ix < len(inString)-1:
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(thisChar,thisLen,) = ParseChar(inString[ix:-1]);
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outString.append(thisChar);
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ix += thisLen;
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# Insert the optional character count or append the optional nul terminating
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# character.
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| 281 |
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if inString[0] == 'C':
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outString.insert(0,len(outString));
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elif inString[0] == 'N':
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outString.append(0);
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elif inString[0] == 'c':
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outString.insert(0,len(outString)-1);
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# That's all.
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return outString;
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def ParseToken(ad,fl_loc,col,raw,allowed):
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"""
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Examine the raw tokens and convert them into dictionary objects consisting of
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the following:
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type the type of token
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value the value of the token
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| 296 |
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this can be the name of a symbol, a numeric value, a string body, ...
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loc start location of the token
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| 298 |
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this is is required by subsequent stages of the assembler for
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error messages
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argument optional entry required for macros arguments
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range optional entry required when a range is provided for a parameter\n
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The token type is compared against the allowed tokens.\n
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Detect syntax errors and display error messages consisting of the error and
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the location within the file where the error occurs.
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"""
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flc_loc = fl_loc + ':' + str(col+1);
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# look for instructions
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# Note: Do this before anything else because instructions can be a
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# strange mix of symbols.
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| 310 |
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if ad.IsInstruction(raw):
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if 'instruction' not in allowed:
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raise AsmException('instruction "%s" not allowed at %s' % (raw,flc_loc));
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return dict(type='instruction', value=raw, loc=flc_loc);
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# look for computation
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a = re.match(r'\${\S+}$',raw);
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| 316 |
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if a:
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| 317 |
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if 'singlevalue' not in allowed:
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| 318 |
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raise AsmException('Computed value not allowed at %s' % flc_loc);
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| 319 |
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try:
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| 320 |
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tParseNumber = eval(raw[2:-1],ad.SymbolDict());
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except:
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| 322 |
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raise AsmException('Malformed computed value at %s: "%s"' % (flc_loc,raw,));
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| 323 |
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if type(tParseNumber) != int:
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| 324 |
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raise AsmException('Malformed single-byte value at %s' % flc_loc);
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| 325 |
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return dict(type='value', value=tParseNumber, loc=flc_loc);
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| 326 |
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# look for a repeated single-byte numeric value (N*M where M is the repeat count)
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| 327 |
5 |
sinclairrf |
matchString=r'(0|0b[01_]+|0[0-7]+|[+\-]?[1-9]\d*|0x[0-9A-Fa-f]{1,2})\*([1-9]\d*|C_\w+|\$\{\S+\})$';
|
| 328 |
2 |
sinclairrf |
a = re.match(matchString,raw);
|
| 329 |
|
|
if a:
|
| 330 |
|
|
if 'multivalue' not in allowed:
|
| 331 |
|
|
raise AsmException('Multi-byte value not allowed at %s' % flc_loc);
|
| 332 |
|
|
b = re.findall(matchString,a.group(0));
|
| 333 |
|
|
if not b:
|
| 334 |
|
|
raise Exception('Program Bug -- findall failed after match worked');
|
| 335 |
|
|
b = b[0];
|
| 336 |
|
|
try:
|
| 337 |
|
|
tParseNumber = ParseNumber(b[0]);
|
| 338 |
|
|
except:
|
| 339 |
|
|
raise AsmException('Malformed multi-byte value at %s' % (fl_loc + ':' + str(col+1)));
|
| 340 |
|
|
tValue = list();
|
| 341 |
|
|
fl_loc2 = fl_loc+':'+str(col+1+len(b[0])+1);
|
| 342 |
|
|
if re.match(r'[1-9]',b[1]):
|
| 343 |
|
|
repeatCount = int(b[1]);
|
| 344 |
|
|
elif re.match(r'C_',b[1]):
|
| 345 |
|
|
if not ad.IsConstant(b[1]):
|
| 346 |
|
|
raise AsmException('Unrecognized symbol "%s" at %s' % (b[1],fl_loc2,));
|
| 347 |
|
|
ix = ad.symbols['list'].index(b[1]);
|
| 348 |
|
|
if len(ad.symbols['body'][ix]) != 1:
|
| 349 |
|
|
raise asmDef.AsmException('constant can only be one byte at %s' % fl_loc2);
|
| 350 |
|
|
repeatCount = ad.symbols['body'][ix][0];
|
| 351 |
|
|
elif re.match(r'\$',b[1]):
|
| 352 |
|
|
repeatCount = eval(b[1][2:-1],ad.SymbolDict());
|
| 353 |
|
|
else:
|
| 354 |
|
|
raise Exception('Program Bug -- unrecognized repeat count');
|
| 355 |
|
|
if repeatCount <= 0:
|
| 356 |
|
|
raise AsmException('Repeat count must be positive at %s' % fl_loc2);
|
| 357 |
|
|
for ix in range(repeatCount):
|
| 358 |
|
|
tValue.append(tParseNumber);
|
| 359 |
|
|
return dict(type='value', value=tValue, loc=flc_loc);
|
| 360 |
|
|
# look for a single-byte numeric value
|
| 361 |
5 |
sinclairrf |
a = re.match(r'(0|0b[01_]+|0[0-7]+|[+\-]?[1-9]\d*|0x[0-9A-Fa-f]+)$',raw);
|
| 362 |
2 |
sinclairrf |
if a:
|
| 363 |
|
|
if 'singlevalue' not in allowed:
|
| 364 |
|
|
raise AsmException('Value not allowed at %s' % flc_loc);
|
| 365 |
|
|
try:
|
| 366 |
|
|
tParseNumber = ParseNumber(raw);
|
| 367 |
|
|
except:
|
| 368 |
|
|
raise AsmException('Malformed single-byte value at %s' % flc_loc);
|
| 369 |
|
|
return dict(type='value', value=tParseNumber, loc=flc_loc);
|
| 370 |
|
|
# capture double-quoted strings
|
| 371 |
|
|
if re.match(r'[CNc]?"',raw):
|
| 372 |
|
|
if 'string' not in allowed:
|
| 373 |
|
|
raise AsmException('String not allowed at %s' % flc_loc);
|
| 374 |
|
|
parsedString = ParseString(raw);
|
| 375 |
|
|
if type(parsedString) == int:
|
| 376 |
|
|
raise AsmException('Malformed string at %s' % (fl_loc + ':' + str(col+parsedString)));
|
| 377 |
|
|
return dict(type='value', value=parsedString, loc=flc_loc);
|
| 378 |
|
|
# capture single-quoted character
|
| 379 |
|
|
if raw[0] == "'":
|
| 380 |
|
|
if 'singlevalue' not in allowed:
|
| 381 |
|
|
raise AsmException('Character not allowed at %s' % flc_loc);
|
| 382 |
|
|
(thisChar,thisLen,) = ParseChar(raw[1:-1]);
|
| 383 |
|
|
if len(raw) != thisLen+2:
|
| 384 |
|
|
raise AsmException('Malformed \'.\' in %s' % flc_loc);
|
| 385 |
|
|
return dict(type='value', value=thisChar, loc=flc_loc);
|
| 386 |
|
|
# look for directives
|
| 387 |
|
|
if ad.IsDirective(raw):
|
| 388 |
|
|
if 'directive' not in allowed:
|
| 389 |
|
|
raise AsmException('Directive not allowed at %s' % flc_loc);
|
| 390 |
|
|
return dict(type='directive', value=raw, loc=flc_loc);
|
| 391 |
|
|
# look for macros
|
| 392 |
6 |
sinclairrf |
# Note: Macro arguments can contain a single layer of macros.
|
| 393 |
|
|
a = re.match(r'\.[A-Za-z]',raw);
|
| 394 |
2 |
sinclairrf |
if a:
|
| 395 |
|
|
b = re.match(r'\.[^(]+',raw);
|
| 396 |
|
|
if not ad.IsMacro(b.group(0)):
|
| 397 |
6 |
sinclairrf |
raise AsmException('Unrecognized directive or macro at %s:%d' % (fl_loc,col+1,));
|
| 398 |
2 |
sinclairrf |
if ('macro' not in allowed) and not ('singlemacro' in allowed and ad.IsSingleMacro(b.group(0))):
|
| 399 |
|
|
raise AsmException('Macro "%s" not allowed at %s:%d' % (b.group(0),fl_loc,col+1,));
|
| 400 |
6 |
sinclairrf |
macroArgs = list();
|
| 401 |
|
|
if len(b.group(0)) == len(raw):
|
| 402 |
|
|
pass;
|
| 403 |
|
|
elif (raw[len(b.group(0))] != '(') or (raw[-1] != ')'):
|
| 404 |
9 |
sinclairrf |
raise AsmException('Malformed macro invokaction "%s" at %s:%d' % (raw,fl_loc,col+1,));
|
| 405 |
6 |
sinclairrf |
else:
|
| 406 |
|
|
tcol = len(b.group(0))+1;
|
| 407 |
|
|
while tcol < len(raw):
|
| 408 |
|
|
c = re.match(r'[^,(]*(\([^)]*\))?',raw[tcol:-1]);
|
| 409 |
|
|
macroArgs.append(c.group(0));
|
| 410 |
|
|
tcol += len(c.group(0))+1;
|
| 411 |
2 |
sinclairrf |
nArgs = ad.MacroNumberArgs(b.group(0))
|
| 412 |
|
|
if len(macroArgs) not in nArgs:
|
| 413 |
|
|
raise AsmException('Wrong number of arguments to macro "%s" at %s:%d' % (b.group(0),fl_loc,col+1));
|
| 414 |
|
|
while len(macroArgs) < nArgs[-1]:
|
| 415 |
|
|
macroArgs.append(ad.MacroDefault(b.group(0),len(macroArgs)));
|
| 416 |
|
|
outArgs = list();
|
| 417 |
6 |
sinclairrf |
tcol = col + len(b.group(0)) + 1;
|
| 418 |
2 |
sinclairrf |
for ixArg in range(len(macroArgs)):
|
| 419 |
6 |
sinclairrf |
outArgs.append(ParseToken(ad,fl_loc,tcol,macroArgs[ixArg],ad.MacroArgTypes(b.group(0),ixArg)));
|
| 420 |
|
|
tcol += len(macroArgs[ixArg]) + 1;
|
| 421 |
2 |
sinclairrf |
return dict(type='macro', value=b.group(0), loc=fl_loc + ':' + str(col+1), argument=outArgs);
|
| 422 |
|
|
# look for a label definition
|
| 423 |
|
|
a = re.match(r':[A-Za-z]\w*$',raw);
|
| 424 |
|
|
if a:
|
| 425 |
|
|
if 'label' not in allowed:
|
| 426 |
|
|
raise AsmException('Label not allowed at %s' % flc_loc);
|
| 427 |
|
|
return dict(type='label', value=raw[1:], loc=flc_loc);
|
| 428 |
|
|
# look for parameters with range specification
|
| 429 |
|
|
a = re.match('[LG]_\w+[[]\d+\+?:\d+]$',raw);
|
| 430 |
|
|
if a:
|
| 431 |
|
|
if 'symbol' not in allowed:
|
| 432 |
|
|
raise AsmException('Symbol not allowed at %s' % flc_loc);
|
| 433 |
|
|
a = re.findall('([LG]_\w+)([[].*)',raw)[0];
|
| 434 |
|
|
return dict(type='symbol', value=a[0], loc=flc_loc, range=a[1]);
|
| 435 |
|
|
# look for symbols
|
| 436 |
|
|
# Note: This should be the last check performed as every other kind of
|
| 437 |
|
|
# token should be recognizable
|
| 438 |
|
|
a = re.match(r'[A-Za-z]\w*$',raw);
|
| 439 |
|
|
if a:
|
| 440 |
|
|
if 'symbol' not in allowed:
|
| 441 |
|
|
raise AsmException('Symbol not allowed at %s' % flc_loc);
|
| 442 |
|
|
return dict(type='symbol', value=a.group(0), loc=flc_loc);
|
| 443 |
|
|
# anything else is an error
|
| 444 |
|
|
raise AsmException('Malformed entry at %s: "%s"' % (flc_loc,raw,));
|
| 445 |
|
|
|
| 446 |
|
|
################################################################################
|
| 447 |
|
|
#
|
| 448 |
|
|
# Extract the tokens from a block of code.
|
| 449 |
|
|
#
|
| 450 |
|
|
# These blocks of code should be generated by FileBodyIterator.
|
| 451 |
|
|
#
|
| 452 |
|
|
################################################################################
|
| 453 |
|
|
|
| 454 |
|
|
def RawTokens(ad,filename,startLineNumber,lines):
|
| 455 |
|
|
"""
|
| 456 |
|
|
Extract the list of tokens from the provided list of lines.
|
| 457 |
|
|
Convert the directive body into a list of individual tokens.\n
|
| 458 |
|
|
Tokens are directive names, symbol names, values, strings, labels, etc.\n
|
| 459 |
|
|
The return is a list of the tokens in the sequence they are encountered. Each
|
| 460 |
|
|
of these tokens is a dictionary object constructed by ParseToken.
|
| 461 |
|
|
"""
|
| 462 |
|
|
allowed = [
|
| 463 |
|
|
'instruction',
|
| 464 |
|
|
'label',
|
| 465 |
|
|
'macro',
|
| 466 |
|
|
'multivalue',
|
| 467 |
|
|
'singlevalue',
|
| 468 |
|
|
'string',
|
| 469 |
|
|
'symbol'
|
| 470 |
|
|
];
|
| 471 |
|
|
ifstack = list();
|
| 472 |
|
|
tokens = list();
|
| 473 |
|
|
lineNumber = startLineNumber - 1;
|
| 474 |
|
|
for line in lines:
|
| 475 |
|
|
lineNumber = lineNumber + 1;
|
| 476 |
|
|
fl_loc = '%s:%d' % (filename,lineNumber);
|
| 477 |
|
|
col = 0;
|
| 478 |
|
|
spaceFound = True;
|
| 479 |
|
|
while col < len(line):
|
| 480 |
|
|
flc_loc = fl_loc + ':' + str(col+1);
|
| 481 |
|
|
# Identify and then ignore white-space characters.
|
| 482 |
|
|
if re.match(r'\s',line[col:]):
|
| 483 |
|
|
spaceFound = True;
|
| 484 |
|
|
col = col + 1;
|
| 485 |
|
|
continue;
|
| 486 |
|
|
# Ensure tokens start on new lines or are separated by spaces.
|
| 487 |
|
|
if not spaceFound:
|
| 488 |
|
|
raise AsmException('Missing space in %s:%d' % (fl_loc,col+1));
|
| 489 |
|
|
spaceFound = False;
|
| 490 |
|
|
# Ignore comments.
|
| 491 |
|
|
if line[col] == ';':
|
| 492 |
|
|
break;
|
| 493 |
|
|
# Catch N"" string.
|
| 494 |
|
|
if re.match(r'N""',line[col:]):
|
| 495 |
|
|
a = re.match(r'N""',line[col:]);
|
| 496 |
|
|
# Catch strings.
|
| 497 |
|
|
elif re.match(r'[CNc]?"',line[col:]):
|
| 498 |
|
|
a = re.match(r'[CNc]?"([^\\"]|\\.)+"',line[col:]);
|
| 499 |
|
|
if not a:
|
| 500 |
|
|
raise AsmException('Malformed string at %s' % flc_loc);
|
| 501 |
|
|
# Catch single-quoted characters
|
| 502 |
|
|
elif re.match(r'\'',line[col:]):
|
| 503 |
|
|
a = re.match(r'\'(.|\\.|\\[xX][0-9A-Fa-f]{1,2}|\\[0-7]{1,3})\'',line[col:]);
|
| 504 |
|
|
if not a:
|
| 505 |
|
|
raise AsmException('Malformed \'.\' at %s' % flc_loc);
|
| 506 |
|
|
else:
|
| 507 |
|
|
# Everything else is a white-space delimited token.
|
| 508 |
|
|
a = re.match(r'\S+',line[col:]);
|
| 509 |
|
|
# Get the candidate token.
|
| 510 |
|
|
candToken = a.group(0);
|
| 511 |
|
|
# Catch conditional code inclusion constructs before parsing the token
|
| 512 |
|
|
if candToken == '.else':
|
| 513 |
|
|
if not ifstack:
|
| 514 |
|
|
raise AsmException('Unmatched ".else" at %s' % flc_loc);
|
| 515 |
|
|
ifstack[-1] = not ifstack[-1];
|
| 516 |
|
|
col += 5;
|
| 517 |
|
|
continue;
|
| 518 |
|
|
if candToken == '.endif':
|
| 519 |
|
|
if not ifstack:
|
| 520 |
|
|
raise AsmException('Unmatched ".endif" at %s' % flc_loc);
|
| 521 |
|
|
ifstack.pop();
|
| 522 |
|
|
col += 6;
|
| 523 |
|
|
continue;
|
| 524 |
|
|
elif re.match(r'\.ifdef\(',candToken):
|
| 525 |
|
|
a = re.findall(r'\.ifdef\((\w+)\)$',candToken);
|
| 526 |
|
|
if not a:
|
| 527 |
|
|
raise AsmException('Malformed ".ifdef" at %s' % flc_loc);
|
| 528 |
|
|
ifstack.append(ad.IsSymbol(a[0]));
|
| 529 |
|
|
col += 8+len(a[0]);
|
| 530 |
|
|
continue;
|
| 531 |
|
|
elif re.match(r'\.ifndef\(',candToken):
|
| 532 |
|
|
a = re.findall(r'\.ifndef\((\w+)\)$',candToken);
|
| 533 |
|
|
if not a:
|
| 534 |
|
|
raise AsmException('Malformed ".ifndef" at %s' % flc_loc);
|
| 535 |
|
|
ifstack.append(not ad.IsSymbol(a[0]));
|
| 536 |
|
|
col += 9+len(a[0]);
|
| 537 |
|
|
continue;
|
| 538 |
|
|
if ifstack and not ifstack[-1]:
|
| 539 |
|
|
col += len(candToken);
|
| 540 |
|
|
continue;
|
| 541 |
|
|
# Determine which kinds of tokens are allowed at this location in the
|
| 542 |
|
|
# directive body.
|
| 543 |
|
|
if not tokens:
|
| 544 |
|
|
selAllowed = 'directive';
|
| 545 |
|
|
else:
|
| 546 |
|
|
selAllowed = allowed;
|
| 547 |
|
|
# Append the parsed token to the list of tokens.
|
| 548 |
|
|
tokens.append(ParseToken(ad,fl_loc,col,candToken,selAllowed));
|
| 549 |
|
|
col += len(candToken);
|
| 550 |
|
|
if ifstack:
|
| 551 |
|
|
raise AsmException('%d unmatched conditionals at line %d' % (len(ifstack),lineNumber,));
|
| 552 |
|
|
return tokens;
|
