[wasm] Master CL for Binary 0xC changes.

src/asmjs/asm-typer.cc

Index: src/asmjs/asm-typer.cc
diff --git a/src/asmjs/asm-typer.cc b/src/asmjs/asm-typer.cc
index 20b8d96053d31477ff81d9e9e54a8daa035706e1..a98c18b5328d4ae12dc5746130b9a56afeffdfa2 100644
--- a/src/asmjs/asm-typer.cc
+++ b/src/asmjs/asm-typer.cc
@@ -128,6 +128,7 @@ AsmTyper::AsmTyper(Isolate* isolate, Zone* zone, Script* script,
       script_(script),
       root_(root),
       forward_definitions_(zone),
+      ffi_use_signatures_(zone),
       stdlib_types_(zone),
       stdlib_math_types_(zone),
       module_info_(VariableInfo::ForSpecialSymbol(zone_, kModule)),
@@ -329,8 +330,8 @@ AsmTyper::VariableInfo* AsmTyper::ImportLookup(Property* import) {
   return i->second;
 }
 
-AsmTyper::VariableInfo* AsmTyper::Lookup(Variable* variable) {
-  ZoneHashMap* scope = in_function_ ? &local_scope_ : &global_scope_;
+AsmTyper::VariableInfo* AsmTyper::Lookup(Variable* variable) const {
+  const ZoneHashMap* scope = in_function_ ? &local_scope_ : &global_scope_;
   ZoneHashMap::Entry* entry =
       scope->Lookup(variable, ComputePointerHash(variable));
   if (entry == nullptr && in_function_) {
@@ -423,6 +424,8 @@ AsmType* AsmTyper::TypeOf(AstNode* node) const {
   return AsmType::None();
 }
 
+AsmType* AsmTyper::TypeOf(Variable* v) const { return Lookup(v)->type(); }
+
 AsmTyper::StandardMember AsmTyper::VariableAsStandardMember(Variable* var) {
   auto* var_info = Lookup(var);
   if (var_info == nullptr) {
@@ -2306,9 +2309,20 @@ AsmType* AsmTyper::ValidateCall(AsmType* return_type, Call* call) {
       FAIL(call, "Calling something that's not a function.");
     }
 
-    if (callee_type->AsFFIType() != nullptr &&
-        return_type == AsmType::Float()) {
-      FAIL(call, "Foreign functions can't return float.");
+    if (callee_type->AsFFIType() != nullptr) {
+      if (return_type == AsmType::Float()) {
+        FAIL(call, "Foreign functions can't return float.");
+      }
+      // Record FFI use signature, since the asm->wasm translator must know
+      // all uses up-front.
+      ffi_use_signatures_.emplace_back(
+          FFIUseSignature(call_var_proxy->var(), zone_));
+      FFIUseSignature* sig = &ffi_use_signatures_.back();
+      sig->return_type_ = return_type;
+      sig->arg_types_.reserve(args.size());
+      for (size_t i = 0; i < args.size(); ++i) {
+        sig->arg_types_.emplace_back(args[i]);
+      }
     }
 
     if (!callee_type->CanBeInvokedWith(return_type, args)) {