Base code for node-hermes

Summary:
Baseline code, basically the same as jsi to initialize the folder.
Just for coherency as more commits are added right now,
since there is nothing really new here.
#utd-hermes-ignore-wasm

Reviewed By: avp

Differential Revision: D28818665

fbshipit-source-id: 7452646d8bf8913c97d321cd7ed80102dad780ac

CMakeLists.txt

@@ -651,6 +651,7 @@ if(HERMES_ENABLE_TEST_SUITE)
     hbc-deltaprep
     hbc-diff
     dependency-extractor
+    node-hermes
     )
 
   set(coverage_directory "")
@@ -672,6 +673,7 @@ if(HERMES_ENABLE_TEST_SUITE)
     hbcdump=${HERMES_TOOLS_OUTPUT_DIR}/hbcdump
     hbc-deltaprep=${HERMES_TOOLS_OUTPUT_DIR}/hbc-deltaprep
     hbc_diff=${HERMES_TOOLS_OUTPUT_DIR}/hbc-diff
+    node-hermes=${HERMES_TOOLS_OUTPUT_DIR}/node-hermes
     build_mode=${HERMES_ASSUMED_BUILD_MODE_IN_LIT_TEST}
     exception_on_oom_enabled=${HERMESVM_EXCEPTION_ON_OOM}
     serialize_enabled=${HERMESVM_SERIALIZE}

test/lit.cfg

@@ -90,3 +90,5 @@ if lit_config.params.get("hbc_diff"):
   config.substitutions.append(("%hbc-diff", lit_config.params["hbc_diff"].replace('\\', '/')))
 if lit_config.params.get("dependency_extractor"):
   config.substitutions.append(("%dependency-extractor", lit_config.params["dependency_extractor"].replace('\\', '/')))
+if lit_config.params.get("node-hermes"):
+  config.substitutions.append(("%node-hermes", lit_config.params["node-hermes"].replace('\\', '/')))

test/node-hermes/no-requires.js

@@ -0,0 +1,17 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+// RUN: %node-hermes %s | %FileCheck --match-full-lines %s
+
+print('No Requires');
+// CHECK-LABEL: No Requires
+
+var x = 5;
+print(x);
+// CHECK-NEXT: 5

tools/CMakeLists.txt

@@ -17,4 +17,5 @@ add_subdirectory(emhermesc)
 add_subdirectory(fuzzers)
 add_subdirectory(dependency-extractor)
 add_subdirectory(hermes-parser)
+add_subdirectory(node-hermes)
 add_subdirectory(synth)

tools/node-hermes/CMakeLists.txt

@@ -0,0 +1,17 @@
+# Copyright (c) Facebook, Inc. and its affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+include_directories(${HERMES_SOURCE_DIR}/API)
+include_directories(${HERMES_JSI_DIR})
+
+set(HERMES_ENABLE_EH ON)
+set(CXX_STANDARD 14)
+set(CXX_STANDARD_REQUIRED ON)
+
+add_hermes_tool(node-hermes
+  node-hermes.cpp
+  ${ALL_HEADER_FILES}
+  LINK_LIBS hermesapi
+  )

tools/node-hermes/node-hermes.cpp

@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include "hermes/Support/OSCompat.h"
+#include "hermes/hermes.h"
+
+#include "llvh/Support/CommandLine.h"
+#include "llvh/Support/FileSystem.h"
+#include "llvh/Support/InitLLVM.h"
+#include "llvh/Support/MemoryBuffer.h"
+#include "llvh/Support/PrettyStackTrace.h"
+#include "llvh/Support/Program.h"
+#include "llvh/Support/Signals.h"
+
+using namespace facebook;
+
+// -help options
+static llvh::cl::opt<std::string> EvalScript(
+    "eval",
+    llvh::cl::desc("evaluate script"),
+    llvh::cl::value_desc("script"));
+
+static llvh::cl::opt<std::string> InputFilename(
+    llvh::cl::Positional,
+    llvh::cl::desc("<file>"),
+    llvh::cl::init("-"));
+
+class FileBuffer : public jsi::Buffer {
+ public:
+  static std::shared_ptr<jsi::Buffer> bufferFromFile(llvh::StringRef path) {
+    auto fileBuffer = llvh::MemoryBuffer::getFileOrSTDIN(path);
+    if (!fileBuffer)
+      return nullptr;
+    return std::make_shared<FileBuffer>(std::move(*fileBuffer));
+  }
+
+  FileBuffer(std::unique_ptr<llvh::MemoryBuffer> buffer)
+      : buffer_(std::move(buffer)){};
+  size_t size() const override {
+    return buffer_->getBufferSize();
+  }
+  const uint8_t *data() const override {
+    return reinterpret_cast<const uint8_t *>(buffer_->getBufferStart());
+  }
+
+ private:
+  std::unique_ptr<llvh::MemoryBuffer> buffer_;
+};
+
+int main(int argc, char **argv) {
+  // Normalize the arg vector.
+  llvh::InitLLVM initLLVM(argc, argv);
+  // Print a stack trace if we signal out.
+  llvh::sys::PrintStackTraceOnErrorSignal("Node Hermes");
+  llvh::PrettyStackTraceProgram X(argc, argv);
+  // Call llvm_shutdown() on exit to print stats and free memory.
+  llvh::llvm_shutdown_obj Y;
+
+  llvh::cl::ParseCommandLineOptions(argc, argv, "Node Hermes \n");
+
+  // Suppress any ASAN leak complaints for the alt signal stack on exit.
+  ::hermes::oscompat::SigAltStackLeakSuppressor sigAltLeakSuppressor;
+
+  if (!EvalScript.empty() && InputFilename != "-") {
+    llvh::errs() << "Cannot use both --eval <script> and <file>" << '\n';
+    return EXIT_FAILURE;
+  }
+
+  auto jsiBuffer = !EvalScript.empty()
+      ? std::make_shared<jsi::StringBuffer>(EvalScript)
+      : FileBuffer::bufferFromFile(InputFilename);
+
+  if (!jsiBuffer) {
+    llvh::errs() << "Error! Failed to open file: " << InputFilename << '\n';
+    return EXIT_FAILURE;
+  }
+
+  std::string srcPath = !EvalScript.empty() ? "<eval>"
+      : InputFilename == "-"                ? "<stdin>"
+                                            : std::string(InputFilename);
+
+  auto runtime = facebook::hermes::makeHermesRuntime();
+
+  try {
+    // add function headers for require, value of last expression becomes the
+    // return value
+    auto result = runtime->evaluateJavaScript(jsiBuffer, srcPath);
+
+  } catch (const jsi::JSIException &e) {
+    llvh::errs() << "JavaScript terminated via uncaught exception: " << e.what()
+                 << '\n';
+    return EXIT_FAILURE;
+  }
+
+  return EXIT_SUCCESS;
+}