1 files changed, 72 insertions, 0 deletions
diff --git a/src/wasm-ast-parser-lexer-shared.c b/src/wasm-ast-parser-lexer-shared.c
new file mode 100644
index 00000000..9c380282
--- /dev/null
+++ b/src/wasm-ast-parser-lexer-shared.c
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2016 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "wasm-ast-parser-lexer-shared.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+
+void wasm_ast_parser_error(WasmLocation* loc,
+                           WasmAstLexer* lexer,
+                           WasmAstParser* parser,
+                           const char* format,
+                           ...) {
+  parser->errors++;
+  va_list args;
+  va_start(args, format);
+  wasm_ast_format_error(parser->error_handler, loc, lexer, format, args);
+  va_end(args);
+}
+
+void wasm_ast_format_error(WasmSourceErrorHandler* error_handler,
+                           const struct WasmLocation* loc,
+                           WasmAstLexer* lexer,
+                           const char* format,
+                           va_list args) {
+  va_list args_copy;
+  va_copy(args_copy, args);
+  char fixed_buf[WASM_DEFAULT_SNPRINTF_ALLOCA_BUFSIZE];
+  char* buffer = fixed_buf;
+  size_t len = wasm_vsnprintf(fixed_buf, sizeof(fixed_buf), format, args);
+  if (len + 1 > sizeof(fixed_buf)) {
+    buffer = alloca(len + 1);
+    len = wasm_vsnprintf(buffer, len + 1, format, args_copy);
+  }
+
+  char* source_line = NULL;
+  size_t source_line_length = 0;
+  int source_line_column_offset = 0;
+  size_t source_line_max_length = error_handler->source_line_max_length;
+  if (loc) {
+    source_line = alloca(source_line_max_length + 1);
+    WasmResult result = wasm_ast_lexer_get_source_line(
+        lexer, loc, source_line_max_length, source_line, &source_line_length,
+        &source_line_column_offset);
+    if (WASM_FAILED(result)) {
+      /* if this fails, it means that we've probably screwed up the lexer. blow
+       * up. */
+      WASM_FATAL("error getting the source line.");
+    }
+  }
+
+  if (error_handler->on_error) {
+    error_handler->on_error(loc, buffer, source_line, source_line_length,
+                            source_line_column_offset,
+                            error_handler->user_data);
+  }
+  va_end(args_copy);
+}