[wasm] asm.js - Check stdlib.NaN is valid, prepare for the rest.

src/asmjs/asm-typer.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 SRC_ASMJS_ASM_TYPER_H_
 #define SRC_ASMJS_ASM_TYPER_H_
 
 #include <cstdint>
 #include <string>
+#include <unordered_set>
 
 #include "src/allocation.h"
 #include "src/asmjs/asm-types.h"
 #include "src/ast/ast-type-bounds.h"
 #include "src/ast/ast.h"
 #include "src/effects.h"
 #include "src/type-info.h"
 #include "src/types.h"
 #include "src/zone-containers.h"
 #include "src/zone.h"
@@ skipping 47 matching lines @@
   ~AsmTyper() = default;
   AsmTyper(Isolate* isolate, Zone* zone, Script* script, FunctionLiteral* root);
 
   bool Validate();
 
   const char* error_message() const { return error_message_; }
 
   AsmType* TypeOf(AstNode* node) const;
   StandardMember VariableAsStandardMember(Variable* var);
 
+  typedef std::unordered_set<StandardMember, std::hash<int> > StdlibSet;
+
+  StdlibSet StdlibUses() const { return stdlib_uses_; }
+
  private:
   friend class v8::internal::wasm::AsmTyperHarnessBuilder;
 
   class VariableInfo : public ZoneObject {
    public:
     enum Mutability {
       kInvalidMutability,
       kLocal,
       kMutableGlobal,
       kImmutableGlobal,
@@ skipping 226 matching lines @@
   ZoneHashMap global_scope_;  // 3.1 Global environment
   ZoneHashMap local_scope_;   // 3.2 Variable environment
 
   std::uintptr_t stack_limit_;
   bool stack_overflow_ = false;
   ZoneMap<AstNode*, AsmType*> node_types_;
   static const int kErrorMessageLimit = 100;
   AsmType* fround_type_;
   AsmType* ffi_type_;
   char error_message_[kErrorMessageLimit];
+  StdlibSet stdlib_uses_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(AsmTyper);
 };
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // SRC_ASMJS_ASM_TYPER_H_