Replace ErrorHandler with Errors and FormatErrors*

`ErrorHandler` complicated all error handling in wabt, since it was
callback-based. Callbacks would be useful if we ever wanted to change
behavior when an error occurred, but instead all that the handler ever
did was write the errors to stdout/stderr or to a buffer.

This change adds a new class `Error`, which contains an `ErrorLevel`, a
`Location` and an error message. It also replaces ErrorHandler with
`Errors` (a typedef for `std::vector<Error>`), and adds a couple of
functions that can format a list of `Errors` for output:
`FormatErrorsTo{String,File}`.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/binary-reader-interp.h b/src/binary-reader-interp.h
index 82043ce5..767b9479 100644
--- a/src/binary-reader-interp.h
+++ b/src/binary-reader-interp.h
@@ -18,6 +18,7 @@
 #define WABT_BINARY_READER_INTERP_H_
 
 #include "src/common.h"
+#include "src/error.h"
 
 namespace wabt {
 
@@ -28,14 +29,13 @@ class Environment;
 
 }  // namespace interp
 
-class ErrorHandler;
 struct ReadBinaryOptions;
 
 Result ReadBinaryInterp(interp::Environment* env,
                         const void* data,
                         size_t size,
                         const ReadBinaryOptions& options,
-                        ErrorHandler*,
+                        Errors*,
                         interp::DefinedModule** out_module);
 
 }  // namespace wabt