[Wasm] Convert many of the fixed-size values to LEB128.

src/wasm/wasm-module.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_MODULE_H_
 #define V8_WASM_MODULE_H_
 
 #include "src/wasm/wasm-opcodes.h"
 #include "src/wasm/wasm-result.h"
 
@@ skipping 46 matching lines @@
 
 // Constants for fixed-size elements within a module.
 static const size_t kDeclMemorySize = 3;
 static const size_t kDeclGlobalSize = 6;
 static const size_t kDeclDataSegmentSize = 13;
 
 // Static representation of a WASM function.
 struct WasmFunction {
   FunctionSig* sig;      // signature of the function.
   uint32_t func_index;   // index into the function table.
-  uint16_t sig_index;    // index into the signature table.
+  uint32_t sig_index;    // index into the signature table.
   uint32_t name_offset;  // offset in the module bytes of the name, if any.
   uint32_t code_start_offset;    // offset in the module bytes of code start.
   uint32_t code_end_offset;      // offset in the module bytes of code end.
   uint16_t local_i32_count;      // number of i32 local variables.
   uint16_t local_i64_count;      // number of i64 local variables.
   uint16_t local_f32_count;      // number of f32 local variables.
   uint16_t local_f64_count;      // number of f64 local variables.
   bool exported;                 // true if this function is exported.
   bool external;  // true if this function is externally supplied.
 };
 
 // Static representation of an imported WASM function.
 struct WasmImport {
   FunctionSig* sig;               // signature of the function.
-  uint16_t sig_index;             // index into the signature table.
+  uint32_t sig_index;             // index into the signature table.
   uint32_t module_name_offset;    // offset in module bytes of the module name.
   uint32_t function_name_offset;  // offset in module bytes of the import name.
 };
 
 // Static representation of an exported WASM function.
 struct WasmExport {
-  uint16_t func_index;   // index into the function table.
+  uint32_t func_index;   // index into the function table.
   uint32_t name_offset;  // offset in module bytes of the name to export.
 };
 
 // Static representation of a wasm global variable.
 struct WasmGlobal {
   uint32_t name_offset;  // offset in the module bytes of the name, if any.
   MachineType type;      // type of the global.
   uint32_t offset;       // offset from beginning of globals area.
   bool exported;         // true if this global is exported.
 };
@@ skipping 156 matching lines @@
 
 // For testing. Decode, verify, and run the last exported function in the
 // given decoded module.
 int32_t CompileAndRunWasmModule(Isolate* isolate, WasmModule* module);
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_MODULE_H_