Fix fatal errors + nice exception traceback interaction.

Cython/Compiler/Errors.py

@@ -61,7 +61,6 @@ class CompileWarning(PyrexWarning):
     #   self.message = message
         Exception.__init__(self, format_position(position) + message)
 
-
 class InternalError(Exception):
     # If this is ever raised, there is a bug in the compiler.
     
@@ -70,6 +69,12 @@ class InternalError(Exception):
         Exception.__init__(self, u"Internal compiler error: %s"
             % message)
 
+class AbortError(Exception):
+    # Throw this to stop the compilation immediately.
+    
+    def __init__(self, message):
+        self.message_only = message
+        Exception.__init__(self, u"Abort error: %s" % message)
 
 class CompilerCrash(CompileError):
     # raised when an unexpected exception occurs in a transform
@@ -140,7 +145,7 @@ def report_error(err):
                 echo_file.write(line.encode('ASCII', 'replace'))
         num_errors = num_errors + 1
         if Options.fatal_errors:
-            raise InternalError, "abort"
+            raise AbortError, "fatal errors"
 
 def error(position, message):
     #print "Errors.error:", repr(position), repr(message) ###

Cython/Compiler/Main.py

@@ -19,7 +19,7 @@ import Errors
 import Parsing
 import Version
 from Scanning import PyrexScanner, FileSourceDescriptor
-from Errors import PyrexError, CompileError, InternalError, error, warning
+from Errors import PyrexError, CompileError, InternalError, AbortError, error, warning
 from Symtab import BuiltinScope, ModuleScope
 from Cython import Utils
 from Cython.Utils import open_new_file, replace_suffix
@@ -38,7 +38,7 @@ def dumptree(t):
 def abort_on_errors(node):
     # Stop the pipeline if there are any errors.
     if Errors.num_errors != 0:
-        raise InternalError, "abort"
+        raise AbortError, "pipeline break"
     return node
 
 class CompilationData(object):
@@ -217,6 +217,7 @@ class Context(object):
     def run_pipeline(self, pipeline, source):
         error = None
         data = source
+        try:
             try:
                 for phase in pipeline:
                     if phase is not None:
@@ -235,6 +236,8 @@ class Context(object):
             if Errors.num_errors == 0:
                 raise
             error = err
+        except AbortError, err:
+            error = err
         return (error, data)
 
     def find_module(self, module_name, 

Cython/Compiler/Visitor.py

@@ -173,6 +173,8 @@ class TreeVisitor(object):
             result = handler_method(child)
         except Errors.CompileError:
             raise
+        except Errors.AbortError:
+            raise
         except Exception, e:
             if DebugFlags.debug_no_exception_intercept:
                 raise