[wasm] Implement official wasm text format

src/wasm/ast-decoder.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_WASM_AST_DECODER_H_
 #define V8_WASM_AST_DECODER_H_
 
 #include "src/base/compiler-specific.h"
 #include "src/globals.h"
 #include "src/signature.h"
@@ skipping 225 matching lines @@
     DCHECK_EQ(kExprBrTable, decoder->checked_read_u8(pc, 0, "opcode"));
     start = pc + 1;
     unsigned len1 = 0;
     table_count = decoder->checked_read_u32v(pc, 1, &len1, "table count");
     if (table_count > (UINT_MAX / sizeof(uint32_t)) - 1 ||
         len1 > UINT_MAX - (table_count + 1) * sizeof(uint32_t)) {
       decoder->error(pc, "branch table size overflow");
     }
     table = pc + 1 + len1;
   }
-  inline uint32_t read_entry(Decoder* decoder, unsigned i) {
-    DCHECK(i <= table_count);
-    return table ? decoder->read_u32(table + i * sizeof(uint32_t)) : 0;
-  }
 };
 
 // A helper to iterate over a branch table.
 class BranchTableIterator {
  public:
   unsigned cur_index() { return index_; }
   bool has_next() { return decoder_->ok() && index_ <= table_count_; }
   uint32_t next() {
     DCHECK(has_next());
     index_++;
@@ skipping 175 matching lines @@
   }
 
   bool has_next() { return pc_ < end_; }
 };
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_AST_DECODER_H_