javaclass

Changeset

158:a52e70c3f294
2005-01-23 Paul Boddie raw files shortlog changelog graph Added "safety measures" for exception offset insertion, although better measures are necessary to avoid bizarre JDK 1.4 exception tables.
javaclass/bytecode.py (file)
     1.1 --- a/javaclass/bytecode.py	Sun Jan 23 21:32:42 2005 +0100
     1.2 +++ b/javaclass/bytecode.py	Sun Jan 23 23:52:39 2005 +0100
     1.3 @@ -37,6 +37,9 @@
     1.4          # A stack of exception block handler pointers.
     1.5          self.exception_handlers = []
     1.6  
     1.7 +        # A list of exception offset details.
     1.8 +        self.exception_offsets = []
     1.9 +
    1.10          # A dictionary mapping labels to jump instructions referencing such labels.
    1.11          self.jumps = {}
    1.12  
    1.13 @@ -294,10 +297,13 @@
    1.14          current_exception_start = self.blocks.pop()
    1.15          # Convert the "lazy" absolute value.
    1.16          current_exception_target = self.exception_handlers.pop()
    1.17 -        target = current_exception_target.get_value()
    1.18 -        #print "*", current_exception_start, target
    1.19          # NOTE: Using 3 as the assumed length of the SETUP_* instruction.
    1.20 -        self._rewrite_value(current_exception_start + 1, target - current_exception_start - 3)
    1.21 +        self.exception_offsets.append((current_exception_start + 1, current_exception_target, current_exception_start))
    1.22 +
    1.23 +    def end_exceptions(self):
    1.24 +        for position, exception_target, exception_start in self.exception_offsets:
    1.25 +            #print "*", exception_start, exception_target.get_value()
    1.26 +            self._rewrite_value(position, exception_target.get_value() - exception_start - 3)
    1.27  
    1.28      def start_handler(self, exc_name, class_file):
    1.29  
    1.30 @@ -816,6 +822,10 @@
    1.31  
    1.32              self.java_position = next_java_position
    1.33  
    1.34 +        # Tidy up exceptions.
    1.35 +
    1.36 +        program.end_exceptions()
    1.37 +
    1.38      def process_bytecode(self, mnemonic, number_of_arguments, code, program):
    1.39  
    1.40          """