node-api: add external buffer creation benchmark

Add a micro benchmark for external buffer creation.

PR-URL: nodejs#54877
Refs: nodejs#53804
Refs: nodejs#44111
Reviewed-By: Gabriel Schulhof <gabrielschulhof@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>

benchmark/napi/buffer/.gitignore

@@ -0,0 +1 @@
+build/

benchmark/napi/buffer/binding.cc

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+#include <node_api.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define NODE_API_CALL(call)                                                    \
+  do {                                                                         \
+    napi_status status = call;                                                 \
+    if (status != napi_ok) {                                                   \
+      fprintf(stderr, #call " failed: %d\n", status);                          \
+      abort();                                                                 \
+    }                                                                          \
+  } while (0)
+
+#define ABORT_IF_FALSE(condition)                                              \
+  if (!(condition)) {                                                          \
+    fprintf(stderr, #condition " failed\n");                                   \
+    abort();                                                                   \
+  }
+
+static void Finalize(node_api_basic_env env, void* data, void* hint) {
+  delete[] static_cast<uint8_t*>(data);
+}
+
+static napi_value CreateExternalBuffer(napi_env env, napi_callback_info info) {
+  napi_value argv[2], undefined, start, end;
+  size_t argc = 2;
+  int32_t n = 0;
+  napi_valuetype val_type = napi_undefined;
+
+  // Validate params and retrieve start and end function.
+  NODE_API_CALL(napi_get_cb_info(env, info, &argc, argv, nullptr, nullptr));
+  ABORT_IF_FALSE(argc == 2);
+  NODE_API_CALL(napi_typeof(env, argv[0], &val_type));
+  ABORT_IF_FALSE(val_type == napi_object);
+  NODE_API_CALL(napi_typeof(env, argv[1], &val_type));
+  ABORT_IF_FALSE(val_type == napi_number);
+  NODE_API_CALL(napi_get_named_property(env, argv[0], "start", &start));
+  NODE_API_CALL(napi_typeof(env, start, &val_type));
+  ABORT_IF_FALSE(val_type == napi_function);
+  NODE_API_CALL(napi_get_named_property(env, argv[0], "end", &end));
+  NODE_API_CALL(napi_typeof(env, end, &val_type));
+  ABORT_IF_FALSE(val_type == napi_function);
+  NODE_API_CALL(napi_get_value_int32(env, argv[1], &n));
+
+  NODE_API_CALL(napi_get_undefined(env, &undefined));
+
+  constexpr uint32_t kBufferLen = 32;
+
+  // Start the benchmark.
+  napi_call_function(env, argv[0], start, 0, nullptr, nullptr);
+
+  for (int32_t idx = 0; idx < n; idx++) {
+    napi_handle_scope scope;
+    uint8_t* buffer = new uint8_t[kBufferLen];
+    napi_value jsbuffer;
+    NODE_API_CALL(napi_open_handle_scope(env, &scope));
+    NODE_API_CALL(napi_create_external_buffer(
+        env, kBufferLen, buffer, Finalize, nullptr, &jsbuffer));
+    NODE_API_CALL(napi_close_handle_scope(env, scope));
+  }
+
+  // Conclude the benchmark.
+  napi_value end_argv[] = {argv[1]};
+  NODE_API_CALL(napi_call_function(env, argv[0], end, 1, end_argv, nullptr));
+
+  return undefined;
+}
+
+NAPI_MODULE_INIT() {
+  napi_property_descriptor props[] = {
+      {"createExternalBuffer",
+       nullptr,
+       CreateExternalBuffer,
+       nullptr,
+       nullptr,
+       nullptr,
+       static_cast<napi_property_attributes>(napi_writable | napi_configurable |
+                                             napi_enumerable),
+       nullptr},
+  };
+
+  NODE_API_CALL(napi_define_properties(
+      env, exports, sizeof(props) / sizeof(*props), props));
+  return exports;
+}

benchmark/napi/buffer/binding.gyp

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+{
+  'targets': [
+    {
+      'target_name': 'binding',
+      'sources': [ 'binding.cc' ],
+      'defines': [
+          'NAPI_EXPERIMENTAL'
+      ]
+    },
+    {
+      'target_name': 'binding_node_api_v8',
+      'sources': [ 'binding.cc' ],
+      'defines': [
+          'NAPI_VERSION=8'
+      ]
+    }
+  ]
+}

benchmark/napi/buffer/index.js

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+'use strict';
+
+const common = require('../../common.js');
+
+const bench = common.createBenchmark(main, {
+  n: [5e6],
+  addon: ['binding', 'binding_node_api_v8'],
+  implem: ['createExternalBuffer'],
+});
+
+function main({ n, implem, addon }) {
+  const binding = require(`./build/${common.buildType}/${addon}`);
+  binding[implem](bench, n);
+}