[wasm] Verify boundaries of data segments when decoding modules.

src/wasm/wasm-module.cc

 // 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.
 
 #include "src/macro-assembler.h"
 #include "src/objects.h"
 #include "src/v8.h"
 
 #include "src/simulator.h"
 
@@ skipping 13 matching lines @@
   os << (1 << module.min_mem_size_log2) << " min mem";
   os << (1 << module.max_mem_size_log2) << " max mem";
   if (module.functions) os << module.functions->size() << " functions";
   if (module.globals) os << module.functions->size() << " globals";
   if (module.data_segments) os << module.functions->size() << " data segments";
   return os;
 }
 
 
 std::ostream& operator<<(std::ostream& os, const WasmFunction& function) {
-  os << "WASM function with signature ";
+  os << "WASM function with signature " << *function.sig;
 
-  // TODO(titzer): factor out rendering of signatures.
-  if (function.sig->return_count() == 0) os << "v";
-  for (size_t i = 0; i < function.sig->return_count(); i++) {
-    os << WasmOpcodes::ShortNameOf(function.sig->GetReturn(i));
-  }
-  os << "_";
-  if (function.sig->parameter_count() == 0) os << "v";
-  for (size_t i = 0; i < function.sig->parameter_count(); i++) {
-    os << WasmOpcodes::ShortNameOf(function.sig->GetParam(i));
-  }
   os << " locals: ";
   if (function.local_int32_count)
     os << function.local_int32_count << " int32s ";
   if (function.local_int64_count)
     os << function.local_int64_count << " int64s ";
   if (function.local_float32_count)
     os << function.local_float32_count << " float32s ";
   if (function.local_float64_count)
     os << function.local_float64_count << " float64s ";
 
@@ skipping 457 matching lines @@
   }
   if (result->IsHeapNumber()) {
     return static_cast<int32_t>(HeapNumber::cast(*result)->value());
   }
   thrower.Error("WASM.compileRun() failed: Return value should be number");
   return -1;
 }
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8