[wasm] Add UTF-8 validation

test/mjsunit/wasm/unicode-validation.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 toByteArray(s) {
+  var arr = [];
+  for (var i = 0; i < s.length; ++i) {
+    arr.push(s.charCodeAt(i) & 0xff);
+  }
+  return arr;
+}
+
+function toString(arr) {
+  if (typeof arr === "string") return arr;
+  var s = "";
+  for (var b of arr) s += String.fromCharCode(b);
+  return s;
+}
+
+function toUTF8(arr) {
+  if (typeof arr === "string" || arr === undefined) return arr;
+  return decodeURIComponent(escape(toString(arr)));
+}
+
+function isValidUtf8(arr) {
+  if (typeof arr === "string" || arr === undefined) return true;
+  try {
+    var s = toUTF8(arr);
+    for (var i = 0; i < s.length; ++i)
+      if ((s.charCodeAt(i) & 0xfffe) == 0xfffe)
+        return false;
+    return true;
+  } catch (e) {
+    if (e instanceof URIError) return false;
+    throw e;
+  }
+}
+
+function checkImportsAndExports(imported_module_name, imported_function_name,
+    internal_function_name, exported_function_name, shouldThrow) {
+  var builder = new WasmModuleBuilder();
+
+  builder.addImportWithModule(imported_module_name, imported_function_name,
+      kSig_v_v);
+
+  builder.addFunction(internal_function_name, kSig_v_v)
+    .addBody([kExprCallImport, kArity0, 0])
+    .exportAs(exported_function_name);
+
+  // sanity check: does javascript agree with out shouldThrow annotation?
+  assertEquals(shouldThrow,
+      !isValidUtf8(imported_module_name) ||
+          !isValidUtf8(imported_function_name) ||
+          !isValidUtf8(exported_function_name),
+      "JavaScript does not agree with our shouldThrow expectation");
+
+  if (!shouldThrow) {
+    imported_module_name = toUTF8(imported_module_name);
+    imported_function_name = toUTF8(imported_function_name);
+  }
+
+  var ffi = new Object();
+  if (imported_function_name === undefined) {
+    ffi[imported_module_name] = function() { };
+  } else {
+    ffi[imported_module_name] = new Object();
+    ffi[imported_module_name][imported_function_name] = function() { };
+  }
+
+  var hasThrown = true;
+  try {
+    builder.instantiate(ffi);
+    hasThrown = false;
+  } catch (err) {
+    if (!shouldThrow) print(err);
+    assertTrue(shouldThrow, "Should not throw error on valid names");
+    assertContains("UTF-8", err.toString());
+  }
+  assertEquals(shouldThrow, hasThrown,
+      "Should throw validation error on invalid names");
+}
+
+function checkImportedModuleName(name, shouldThrow) {
+  checkImportsAndExports(name, "imp", "func", undefined, shouldThrow);
+}
+
+function checkImportedFunctionName(name, shouldThrow) {
+  checkImportsAndExports("module", name, "func", "func", shouldThrow);
+}
+
+function checkExportedFunctionName(name, shouldThrow) {
+  checkImportsAndExports("module", "func", "func", name, shouldThrow);
+}
+
+function checkInternalFunctionName(name) {
+  checkImportsAndExports("module", "func", name, "func", false);
+}
+
+function checkAll(name, shouldThrow) {
+  checkImportedModuleName(name, shouldThrow);
+  checkImportedFunctionName(name, shouldThrow);
+  checkExportedFunctionName(name, shouldThrow);
+  checkInternalFunctionName(name);
+}
+
+checkAll("ascii", false);
+checkAll("some math: (½)² = ¼", false);
+checkAll("中国历史系列条目\n北", false);
+checkAll(toByteArray("\xef\xb7\x8f"), false);
+checkAll(toByteArray("a\xc2\x81\xe1\x80\xbf\xf1\x80\xa0\xbf"), false);
+checkAll(toByteArray("\xff"), true);
+checkAll(toByteArray("\xed\xa0\x8f"), true);        // surrogate code points
+checkAll(toByteArray("\xe0\x82\x80"), true);        // overlong sequence
+checkAll(toByteArray("\xf4\x90\x80\x80"), true);    // beyond limit: U+110000
+checkAll(toByteArray("\xef\xbf\xbe"), true);        // non-character; U+FFFE
+checkAll(toByteArray("with\x00null"), false);