[wasm] [asm.js] Track direct function indices and fixup.

src/wasm/wasm-module-builder.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_WASM_MODULE_BUILDER_H_
 #define V8_WASM_WASM_MODULE_BUILDER_H_
 
 #include "src/signature.h"
 #include "src/zone/zone-containers.h"
 
@@ skipping 108 matching lines @@
   void EmitVarInt(uint32_t val);
   void EmitCode(const byte* code, uint32_t code_size);
   void Emit(WasmOpcode opcode);
   void EmitGetLocal(uint32_t index);
   void EmitSetLocal(uint32_t index);
   void EmitTeeLocal(uint32_t index);
   void EmitI32Const(int32_t val);
   void EmitWithU8(WasmOpcode opcode, const byte immediate);
   void EmitWithU8U8(WasmOpcode opcode, const byte imm1, const byte imm2);
   void EmitWithVarInt(WasmOpcode opcode, uint32_t immediate);
+  void EmitDirectCallIndex(uint32_t index);
   void SetExported();
   void SetName(const char* name, int name_length);
 
   void WriteSignature(ZoneBuffer& buffer) const;
   void WriteExport(ZoneBuffer& buffer) const;
   void WriteBody(ZoneBuffer& buffer) const;
 
   bool exported() { return exported_; }
   uint32_t func_index() { return func_index_; }
   FunctionSig* signature();
 
  private:
   explicit WasmFunctionBuilder(WasmModuleBuilder* builder);
   friend class WasmModuleBuilder;
   friend class WasmTemporary;
+
+  struct DirectCallIndex {
+    size_t offset;
+    uint32_t direct_index;
+  };
+
   WasmModuleBuilder* builder_;
   LocalDeclEncoder locals_;
   uint32_t signature_index_;
   bool exported_;
   uint32_t func_index_;
   ZoneVector<uint8_t> body_;
   ZoneVector<char> name_;
   ZoneVector<uint32_t> i32_temps_;
   ZoneVector<uint32_t> i64_temps_;
   ZoneVector<uint32_t> f32_temps_;
   ZoneVector<uint32_t> f64_temps_;
+  ZoneVector<DirectCallIndex> direct_calls_;
 };
 
 class WasmTemporary {
  public:
   WasmTemporary(WasmFunctionBuilder* builder, LocalType type) {
     switch (type) {
       case kAstI32:
         temporary_ = &builder->i32_temps_;
         break;
       case kAstI64:
@@ skipping 89 matching lines @@
 
 inline FunctionSig* WasmFunctionBuilder::signature() {
   return builder_->signatures_[signature_index_];
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_WASM_MODULE_BUILDER_H_