[wasm] Add utilities to print out WASM ast directly from the bytes.

test/cctest/wasm/wasm-run-utils.h

 // Copyright 2016 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 WASM_RUN_UTILS_H
 #define WASM_RUN_UTILS_H
 
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
@@ skipping 150 matching lines @@
     AllocModule();
     if (module->functions == nullptr) {
       module->functions = new std::vector<WasmFunction>();
       function_code = new std::vector<Handle<Code>>();
     }
     module->functions->push_back({sig, 0, 0, 0, 0, 0, 0, 0, false, false});
     function_code->push_back(code);
     return &module->functions->back();
   }
 
+  void AddIndirectFunctionTable(int* functions, int table_size) {

[ahaas, 2016/01/21 15:47:28]

This function is only used with the parameters "null_ptr, 0". Do you plan to use
it for more tests? If not, then imo the code should not be more complex than
necessary.

+    AllocModule();
+    Isolate* isolate = module->shared_isolate;
+    Handle<FixedArray> fixed =
+        isolate->factory()->NewFixedArray(2 * table_size);
+    function_table = fixed;
+    module->function_table = new std::vector<uint16_t>();
+    for (int i = 0; i < table_size; i++) {
+      module->function_table->push_back(functions[i]);
+    }
+  }
+
+  void PopulateIndirectFunctionTable() {

[ahaas, 2016/01/21 15:47:28]

This function is not used anywhere. Does it have to be in this CL?

+    if (function_table.is_null()) return;
+    int table_size = static_cast<int>(module->function_table->size());
+    for (int i = 0; i < table_size; i++) {
+      int function = module->function_table->at(i);
+      function_table->set(i, Smi::FromInt(function));
+      function_table->set(i + table_size, *function_code->at(function));
+    }
+  }
+
+
  private:
   size_t mem_size;
   uint32_t global_offset;
   byte global_data[kMaxGlobalsSize];
 
   WasmGlobal* AddGlobal(MachineType mem_type) {
     AllocModule();
     if (globals_area == 0) {
       globals_area = reinterpret_cast<uintptr_t>(global_data);
       module->globals = new std::vector<WasmGlobal>();
@@ skipping 201 matching lines @@
     if (p1 == MachineType::None()) return 1;
     if (p2 == MachineType::None()) return 2;
     if (p3 == MachineType::None()) return 3;
     return 4;
   }
 };
 
 }  // namespace
 
 #endif