[wasm] Use a Managed<WasmModule> to hold metadata about modules.

src/wasm/signature-map.cc

Index: src/wasm/signature-map.cc
diff --git a/src/wasm/signature-map.cc b/src/wasm/signature-map.cc
index e7f8b2fc94d16d66caad53f8778f3e0e7836da24..ef20fac08aec7fb40435b02f8fcbee3261a78d47 100644
--- a/src/wasm/signature-map.cc
+++ b/src/wasm/signature-map.cc
@@ -46,6 +46,18 @@ bool SignatureMap::CompareFunctionSigs::operator()(FunctionSig* a,
   return false;
 }
 
+bool SignatureMap::Equal(FunctionSig* a, FunctionSig* b) {
+  if (a->parameter_count() != b->parameter_count()) return false;
+  if (a->return_count() != b->return_count()) return false;
+  for (size_t i = 0; i < a->parameter_count(); i++) {

[Mircea Trofin, 2016/10/19 05:28:55]

This bottom part could be done blindly wrt what's a parameter and what's a
return value, since we 
established they are the same. At that point, can't we just compare the
underlying storage?

Any reason this API isn't a member of FunctionSig?

[titzer, 2016/10/19 09:54:41]

Done.

+    if (a->GetParam(i) != b->GetParam(i)) return false;
+  }
+  for (size_t i = 0; i < a->return_count(); i++) {
+    if (a->GetReturn(i) != b->GetReturn(i)) return false;
+  }
+  return true;
+}
+
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8