Change {Source,Binary}ErrorHandler to C++ (#403)

Added some new classes:

* BinaryErrorHandler: abstract base class
* BinaryErrorHandlerFile: writes errors to a FILE*
* SourceErrorHandler: abstract base class
* SourceErrorHandlerNop: eats all errors
* SourceErrorHandlerFile: writes errors to a FILE*

There are some specific ones as well:

* BinaryErrorHandlerAssert: used in wasm-interp to handle writing out a
  custom header with assertion "failures"; i.e. places where the error
  handler should fire.
* BinaryErrorHandlerModule: used when parsing a .wast, but there's an
  embedded binary file.

1 files changed, 2 insertions, 4 deletions

diff --git a/src/ast-parser.h b/src/ast-parser.h
index 0992d16b..4cd90f31 100644
--- a/src/ast-parser.h
+++ b/src/ast-parser.h
@@ -18,15 +18,13 @@
 #define WABT_AST_PARSER_H_
 
 #include "ast-lexer.h"
-#include "common.h"
 
 namespace wabt {
 
 struct Script;
+class SourceErrorHandler;
 
-Result parse_ast(AstLexer* lexer,
-                 struct Script** out_script,
-                 SourceErrorHandler*);
+Result parse_ast(AstLexer* lexer, Script** out_script, SourceErrorHandler*);
 
 }  // namespace wabt