1 files changed, 117 insertions, 0 deletions
diff --git a/js/src/jsapi-tests/testWasmEncoder.cpp b/js/src/jsapi-tests/testWasmEncoder.cpp
new file mode 100644
index 0000000000..a90249264c
--- /dev/null
+++ b/js/src/jsapi-tests/testWasmEncoder.cpp
@@ -0,0 +1,117 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "jit/MacroAssembler.h"
+
+#include "jsapi-tests/tests.h"
+#include "jsapi-tests/testsJit.h"
+
+#include "wasm/WasmConstants.h"
+#include "wasm/WasmFeatures.h"  // AnyCompilerAvailable
+#include "wasm/WasmGenerator.h"
+#include "wasm/WasmSignalHandlers.h"  // EnsureFullSignalHandlers
+#include "wasm/WasmValType.h"
+
+using namespace js;
+using namespace js::jit;
+using namespace js::wasm;
+
+static bool TestTruncFn(JSContext* cx, unsigned argc, Value* vp) {
+  CallArgs args = CallArgsFromVp(argc, vp);
+  double d = args[0].toDouble();
+  args.rval().setInt32((int)d);
+  return true;
+}
+
+// Check if wasm modules can be encoded in C++ and run.
+BEGIN_TEST(testWasmEncodeBasic) {
+  if (!AnyCompilerAvailable(cx)) {
+    knownFail = true;
+    return false;
+  }
+
+  EnsureFullSignalHandlers(cx);
+
+  FeatureOptions options;
+  ScriptedCaller scriptedCaller;
+  SharedCompileArgs compileArgs =
+      CompileArgs::buildAndReport(cx, std::move(scriptedCaller), options);
+
+  ModuleEnvironment moduleEnv(compileArgs->features);
+  CompilerEnvironment compilerEnv(CompileMode::Once, Tier::Optimized,
+                                  DebugEnabled::False);
+  compilerEnv.computeParameters();
+  MOZ_ALWAYS_TRUE(moduleEnv.init());
+
+  ValTypeVector paramsImp, resultsImp;
+  MOZ_ALWAYS_TRUE(paramsImp.emplaceBack(ValType::F64) &&
+                  resultsImp.emplaceBack(ValType::I32));
+
+  CacheableName ns;
+  CacheableName impName;
+  MOZ_ALWAYS_TRUE(CacheableName::fromUTF8Chars("t", &impName));
+  MOZ_ALWAYS_TRUE(moduleEnv.addImportedFunc(std::move(paramsImp),
+                                            std::move(resultsImp),
+                                            std::move(ns), std::move(impName)));
+
+  ValTypeVector params, results;
+  MOZ_ALWAYS_TRUE(results.emplaceBack(ValType::I32));
+  CacheableName expName;
+  MOZ_ALWAYS_TRUE(CacheableName::fromUTF8Chars("r", &expName));
+  MOZ_ALWAYS_TRUE(moduleEnv.addDefinedFunc(std::move(params),
+                                           std::move(results), true,
+                                           mozilla::Some(std::move(expName))));
+
+  ModuleGenerator mg(*compileArgs, &moduleEnv, &compilerEnv, nullptr, nullptr,
+                     nullptr);
+  MOZ_ALWAYS_TRUE(mg.init(nullptr));
+
+  // Build function and keep bytecode around until the end.
+  Bytes bytecode;
+  {
+    Encoder encoder(bytecode);
+    MOZ_ALWAYS_TRUE(EncodeLocalEntries(encoder, ValTypeVector()));
+    MOZ_ALWAYS_TRUE(encoder.writeOp(Op::F64Const) &&
+                    encoder.writeFixedF64(42.3));
+    MOZ_ALWAYS_TRUE(encoder.writeOp(Op::Call) && encoder.writeVarU32(0));
+    MOZ_ALWAYS_TRUE(encoder.writeOp(Op::End));
+  }
+  MOZ_ALWAYS_TRUE(mg.compileFuncDef(1, 0, bytecode.begin(),
+                                    bytecode.begin() + bytecode.length()));
+  MOZ_ALWAYS_TRUE(mg.finishFuncDefs());
+
+  SharedBytes shareableBytes = js_new<ShareableBytes>();
+  MOZ_ALWAYS_TRUE(shareableBytes);
+  SharedModule module = mg.finishModule(*shareableBytes);
+  MOZ_ALWAYS_TRUE(module);
+
+  MOZ_ASSERT(module->imports().length() == 1);
+  MOZ_ASSERT(module->exports().length() == 1);
+
+  // Instantiate and run.
+  {
+    Rooted<ImportValues> imports(cx);
+    RootedFunction func(cx, NewNativeFunction(cx, TestTruncFn, 0, nullptr));
+    MOZ_ALWAYS_TRUE(func);
+    MOZ_ALWAYS_TRUE(imports.get().funcs.append(func));
+
+    Rooted<WasmInstanceObject*> instance(cx);
+    MOZ_ALWAYS_TRUE(module->instantiate(cx, imports.get(), nullptr, &instance));
+    RootedFunction wasmFunc(cx);
+    MOZ_ALWAYS_TRUE(
+        WasmInstanceObject::getExportedFunction(cx, instance, 1, &wasmFunc));
+
+    JSAutoRealm ar(cx, wasmFunc);
+    RootedValue rval(cx);
+    RootedValue fval(cx);
+    MOZ_ALWAYS_TRUE(
+        JS::Call(cx, fval, wasmFunc, JS::HandleValueArray::empty(), &rval));
+    MOZ_RELEASE_ASSERT(rval.toInt32() == 42);
+  }
+  return true;
+}
+END_TEST(testWasmEncodeBasic)