[wasm] Refactor import handling for 0xC.

test/mjsunit/wasm/globals.js

+// 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.
+
+// Flags: --expose-wasm
+
+load("test/mjsunit/wasm/wasm-constants.js");
+load("test/mjsunit/wasm/wasm-module-builder.js");
+
+function TestImported(type, val, expected) {
+  print("TestImported " + type + "(" + val +")" + " = " + expected);
+  var builder = new WasmModuleBuilder();
+  var sig = makeSig([], [type]);
+  var g = builder.addImportedGlobal("foo", undefined, type);
+  builder.addFunction("main", sig)
+    .addBody([kExprGetGlobal, g.index])
+    .exportAs("main");
+  builder.addGlobal(kAstI32);  // pad
+
+  var instance = builder.instantiate({foo: val});
+  assertEquals(expected, instance.exports.main());
+}
+
+TestImported(kAstI32, 300.1, 300);
+TestImported(kAstF32, 87234.87238, Math.fround(87234.87238));
+TestImported(kAstF64, 77777.88888, 77777.88888);
+TestImported(kAstF64, "89", 89);
+
+
+function TestExported(type, val, expected) {
+  print("TestExported " + type + "(" + val +")" + " = " + expected);
+  var builder = new WasmModuleBuilder();
+  var sig = makeSig([type], []);
+  builder.addGlobal(kAstI32);  // pad
+  var g = builder.addGlobal(type, false)
+      .exportAs("foo");
+  g.init = val;
+  builder.addGlobal(kAstI32);  // pad
+
+  var instance = builder.instantiate();
+  assertEquals(expected, instance.exports.foo);
+}
+
+TestExported(kAstI32, 455.5, 455);
+TestExported(kAstF32, -999.34343, Math.fround(-999.34343));
+TestExported(kAstF64, 87347.66666, 87347.66666);
+
+
+function TestImportedExported(type, val, expected) {
+  print("TestImportedExported " + type + "(" + val +")" + " = " + expected);
+  var builder = new WasmModuleBuilder();
+  var sig = makeSig([type], []);
+  var i = builder.addImportedGlobal("foo", undefined, type);
+  builder.addGlobal(kAstI32);  // pad
+  var o = builder.addGlobal(type, false)
+      .exportAs("bar");
+  o.init_index = i;
+  builder.addGlobal(kAstI32);  // pad
+
+  var instance = builder.instantiate({foo: val});
+  assertEquals(expected, instance.exports.bar);
+}
+
+TestImportedExported(kAstI32, 415.5, 415);
+TestImportedExported(kAstF32, -979.34343, Math.fround(-979.34343));
+TestImportedExported(kAstF64, 81347.66666, 81347.66666);