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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	heap_utils.cc	Lines:	122	243	50.2 %
Date:	2022-08-12 04:19:25	Branches:	25	104	24.0 %


#include "diagnosticfilename-inl.h"
#include "env-inl.h"
#include "memory_tracker-inl.h"
#include "node_external_reference.h"
#include "stream_base-inl.h"
#include "util-inl.h"

// Copied from https://github.com/nodejs/node/blob/b07dc4d19fdbc15b4f76557dc45b3ce3a43ad0c3/src/util.cc#L36-L41.
#ifdef _WIN32
#include <io.h>  // _S_IREAD _S_IWRITE
#ifndef S_IRUSR
#define S_IRUSR _S_IREAD
#endif  // S_IRUSR
#ifndef S_IWUSR
#define S_IWUSR _S_IWRITE
#endif  // S_IWUSR
#endif

using v8::Array;
using v8::Boolean;
using v8::Context;
using v8::EmbedderGraph;
using v8::EscapableHandleScope;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::Global;
using v8::HandleScope;
using v8::HeapSnapshot;
using v8::Isolate;
using v8::JustVoid;
using v8::Local;
using v8::Maybe;
using v8::MaybeLocal;
using v8::Nothing;
using v8::Number;
using v8::Object;
using v8::ObjectTemplate;
using v8::String;
using v8::Value;

namespace node {
namespace heap {

class JSGraphJSNode : public EmbedderGraph::Node {
 public:
  const char* Name() override { return "<JS Node>"; }
  size_t SizeInBytes() override { return 0; }
  bool IsEmbedderNode() override { return false; }
  Local<Value> JSValue() { return PersistentToLocal::Strong(persistent_); }

  int IdentityHash() {
    Local<Value> v = JSValue();
    if (v->IsObject()) return v.As<Object>()->GetIdentityHash();
    if (v->IsName()) return v.As<v8::Name>()->GetIdentityHash();
    if (v->IsInt32()) return v.As<v8::Int32>()->Value();
    return 0;
  }

  JSGraphJSNode(Isolate* isolate, Local<Value> val)
      : persistent_(isolate, val) {
    CHECK(!val.IsEmpty());
  }

  struct Hash {
    inline size_t operator()(JSGraphJSNode* n) const {
      return static_cast<size_t>(n->IdentityHash());
    }
  };

  struct Equal {
    inline bool operator()(JSGraphJSNode* a, JSGraphJSNode* b) const {
      return a->JSValue()->SameValue(b->JSValue());
    }
  };

 private:
  Global<Value> persistent_;
};

class JSGraph : public EmbedderGraph {
 public:
  explicit JSGraph(Isolate* isolate) : isolate_(isolate) {}

  Node* V8Node(const Local<Value>& value) override {
    std::unique_ptr<JSGraphJSNode> n { new JSGraphJSNode(isolate_, value) };
    auto it = engine_nodes_.find(n.get());
    if (it != engine_nodes_.end())
      return *it;
    engine_nodes_.insert(n.get());
    return AddNode(std::unique_ptr<Node>(n.release()));
  }

  Node* AddNode(std::unique_ptr<Node> node) override {
    Node* n = node.get();
    nodes_.emplace(std::move(node));
    return n;
  }

  void AddEdge(Node* from, Node* to, const char* name = nullptr) override {
    edges_[from].insert(std::make_pair(name, to));
  }

  MaybeLocal<Array> CreateObject() const {
    EscapableHandleScope handle_scope(isolate_);
    Local<Context> context = isolate_->GetCurrentContext();
    Environment* env = Environment::GetCurrent(context);

    std::unordered_map<Node*, Local<Object>> info_objects;
    Local<Array> nodes = Array::New(isolate_, nodes_.size());
    Local<String> edges_string = FIXED_ONE_BYTE_STRING(isolate_, "edges");
    Local<String> is_root_string = FIXED_ONE_BYTE_STRING(isolate_, "isRoot");
    Local<String> name_string = env->name_string();
    Local<String> size_string = env->size_string();
    Local<String> value_string = env->value_string();
    Local<String> wraps_string = FIXED_ONE_BYTE_STRING(isolate_, "wraps");
    Local<String> to_string = FIXED_ONE_BYTE_STRING(isolate_, "to");

    for (const std::unique_ptr<Node>& n : nodes_)
      info_objects[n.get()] = Object::New(isolate_);

    {
      HandleScope handle_scope(isolate_);
      size_t i = 0;
      for (const std::unique_ptr<Node>& n : nodes_) {
        Local<Object> obj = info_objects[n.get()];
        Local<Value> value;
        std::string name_str;
        const char* prefix = n->NamePrefix();
        if (prefix == nullptr) {
          name_str = n->Name();
        } else {
          name_str = n->NamePrefix();
          name_str += " ";
          name_str += n->Name();
        }
        if (!String::NewFromUtf8(isolate_, name_str.c_str()).ToLocal(&value) ||
            obj->Set(context, name_string, value).IsNothing() ||
            obj->Set(context,
                     is_root_string,
                     Boolean::New(isolate_, n->IsRootNode()))
                .IsNothing() ||
            obj->Set(
                   context,
                   size_string,
                   Number::New(isolate_, static_cast<double>(n->SizeInBytes())))
                .IsNothing() ||
            obj->Set(context, edges_string, Array::New(isolate_)).IsNothing()) {
          return MaybeLocal<Array>();
        }
        if (nodes->Set(context, i++, obj).IsNothing())
          return MaybeLocal<Array>();
        if (!n->IsEmbedderNode()) {
          value = static_cast<JSGraphJSNode*>(n.get())->JSValue();
          if (obj->Set(context, value_string, value).IsNothing())
            return MaybeLocal<Array>();
        }
      }
    }

    for (const std::unique_ptr<Node>& n : nodes_) {
      Node* wraps = n->WrapperNode();
      if (wraps == nullptr) continue;
      Local<Object> from = info_objects[n.get()];
      Local<Object> to = info_objects[wraps];
      if (from->Set(context, wraps_string, to).IsNothing())
        return MaybeLocal<Array>();
    }

    for (const auto& edge_info : edges_) {
      Node* source = edge_info.first;
      Local<Value> edges;
      if (!info_objects[source]->Get(context, edges_string).ToLocal(&edges) ||
          !edges->IsArray()) {
        return MaybeLocal<Array>();
      }

      size_t i = 0;
      size_t j = 0;
      for (const auto& edge : edge_info.second) {
        Local<Object> to_object = info_objects[edge.second];
        Local<Object> edge_obj = Object::New(isolate_);
        Local<Value> edge_name_value;
        const char* edge_name = edge.first;
        if (edge_name != nullptr) {
          if (!String::NewFromUtf8(isolate_, edge_name)
              .ToLocal(&edge_name_value)) {
            return MaybeLocal<Array>();
          }
        } else {
          edge_name_value = Number::New(isolate_, static_cast<double>(j++));
        }
        if (edge_obj->Set(context, name_string, edge_name_value).IsNothing() ||
            edge_obj->Set(context, to_string, to_object).IsNothing() ||
            edges.As<Array>()->Set(context, i++, edge_obj).IsNothing()) {
          return MaybeLocal<Array>();
        }
      }
    }

    return handle_scope.Escape(nodes);
  }

 private:
  Isolate* isolate_;
  std::unordered_set<std::unique_ptr<Node>> nodes_;
  std::unordered_set<JSGraphJSNode*, JSGraphJSNode::Hash, JSGraphJSNode::Equal>
      engine_nodes_;
  std::unordered_map<Node*, std::set<std::pair<const char*, Node*>>> edges_;
};

void BuildEmbedderGraph(const FunctionCallbackInfo<Value>& args) {
  Environment* env = Environment::GetCurrent(args);
  JSGraph graph(env->isolate());
  Environment::BuildEmbedderGraph(env->isolate(), &graph, env);
  Local<Array> ret;
  if (graph.CreateObject().ToLocal(&ret))
    args.GetReturnValue().Set(ret);
}

namespace {
class FileOutputStream : public v8::OutputStream {
 public:
  FileOutputStream(const int fd, uv_fs_t* req) : fd_(fd), req_(req) {}

  int GetChunkSize() override {
    return 65536;  // big chunks == faster
  }

  void EndOfStream() override {}

  WriteResult WriteAsciiChunk(char* data, const int size) override {
    DCHECK_EQ(status_, 0);
    int offset = 0;
    while (offset < size) {
      const uv_buf_t buf = uv_buf_init(data + offset, size - offset);
      const int num_bytes_written = uv_fs_write(nullptr,
                                                req_,
                                                fd_,
                                                &buf,
                                                1,
                                                -1,
                                                nullptr);
      uv_fs_req_cleanup(req_);
      if (num_bytes_written < 0) {
        status_ = num_bytes_written;
        return kAbort;
      }
      DCHECK_LE(static_cast<size_t>(num_bytes_written), buf.len);
      offset += num_bytes_written;
    }
    DCHECK_EQ(offset, size);
    return kContinue;
  }

  int status() const { return status_; }

 private:
  const int fd_;
  uv_fs_t* req_;
  int status_ = 0;
};

class HeapSnapshotStream : public AsyncWrap,
                           public StreamBase,
                           public v8::OutputStream {
 public:
  HeapSnapshotStream(
      Environment* env,
      HeapSnapshotPointer&& snapshot,
      Local<Object> obj) :
      AsyncWrap(env, obj, AsyncWrap::PROVIDER_HEAPSNAPSHOT),
      StreamBase(env),
      snapshot_(std::move(snapshot)) {
    MakeWeak();
    StreamBase::AttachToObject(GetObject());
  }

  ~HeapSnapshotStream() override {}

  int GetChunkSize() override {
    return 65536;  // big chunks == faster
  }

  void EndOfStream() override {
    EmitRead(UV_EOF);
    snapshot_.reset();
  }

  WriteResult WriteAsciiChunk(char* data, int size) override {
    int len = size;
    while (len != 0) {
      uv_buf_t buf = EmitAlloc(size);
      ssize_t avail = len;
      if (static_cast<ssize_t>(buf.len) < avail)
        avail = buf.len;
      memcpy(buf.base, data, avail);
      data += avail;
      len -= static_cast<int>(avail);
      EmitRead(size, buf);
    }
    return kContinue;
  }

  int ReadStart() override {
    CHECK_NE(snapshot_, nullptr);
    snapshot_->Serialize(this, HeapSnapshot::kJSON);
    return 0;
  }

  int ReadStop() override {
    return 0;
  }

  int DoShutdown(ShutdownWrap* req_wrap) override {
    UNREACHABLE();
  }

  int DoWrite(WriteWrap* w,
              uv_buf_t* bufs,
              size_t count,
              uv_stream_t* send_handle) override {
    UNREACHABLE();
  }

  bool IsAlive() override { return snapshot_ != nullptr; }
  bool IsClosing() override { return snapshot_ == nullptr; }
  AsyncWrap* GetAsyncWrap() override { return this; }

  void MemoryInfo(MemoryTracker* tracker) const override {
    if (snapshot_ != nullptr) {
      tracker->TrackFieldWithSize(
          "snapshot", sizeof(*snapshot_), "HeapSnapshot");
    }
  }

  SET_MEMORY_INFO_NAME(HeapSnapshotStream)
  SET_SELF_SIZE(HeapSnapshotStream)

 private:
  HeapSnapshotPointer snapshot_;
};

inline void TakeSnapshot(Environment* env, v8::OutputStream* out) {
  HeapSnapshotPointer snapshot {
      env->isolate()->GetHeapProfiler()->TakeHeapSnapshot() };
  snapshot->Serialize(out, HeapSnapshot::kJSON);
}

}  // namespace

Maybe<void> WriteSnapshot(Environment* env, const char* filename) {
  uv_fs_t req;
  int err;

  const int fd = uv_fs_open(nullptr,
                            &req,
                            filename,
                            O_WRONLY | O_CREAT | O_TRUNC,
                            S_IWUSR | S_IRUSR,
                            nullptr);
  uv_fs_req_cleanup(&req);
  if ((err = fd) < 0) {
    env->ThrowUVException(err, "open", nullptr, filename);
    return Nothing<void>();
  }

  FileOutputStream stream(fd, &req);
  TakeSnapshot(env, &stream);
  if ((err = stream.status()) < 0) {
    env->ThrowUVException(err, "write", nullptr, filename);
    return Nothing<void>();
  }

  err = uv_fs_close(nullptr, &req, fd, nullptr);
  uv_fs_req_cleanup(&req);
  if (err < 0) {
    env->ThrowUVException(err, "close", nullptr, filename);
    return Nothing<void>();
  }

  return JustVoid();
}

void DeleteHeapSnapshot(const HeapSnapshot* snapshot) {
  const_cast<HeapSnapshot*>(snapshot)->Delete();
}

BaseObjectPtr<AsyncWrap> CreateHeapSnapshotStream(
    Environment* env, HeapSnapshotPointer&& snapshot) {
  HandleScope scope(env->isolate());

  if (env->streambaseoutputstream_constructor_template().IsEmpty()) {
    // Create FunctionTemplate for HeapSnapshotStream
    Local<FunctionTemplate> os = FunctionTemplate::New(env->isolate());
    os->Inherit(AsyncWrap::GetConstructorTemplate(env));
    Local<ObjectTemplate> ost = os->InstanceTemplate();
    ost->SetInternalFieldCount(StreamBase::kInternalFieldCount);
    os->SetClassName(
        FIXED_ONE_BYTE_STRING(env->isolate(), "HeapSnapshotStream"));
    StreamBase::AddMethods(env, os);
    env->set_streambaseoutputstream_constructor_template(ost);
  }

  Local<Object> obj;
  if (!env->streambaseoutputstream_constructor_template()
           ->NewInstance(env->context())
           .ToLocal(&obj)) {
    return {};
  }
  return MakeBaseObject<HeapSnapshotStream>(env, std::move(snapshot), obj);
}

void CreateHeapSnapshotStream(const FunctionCallbackInfo<Value>& args) {
  Environment* env = Environment::GetCurrent(args);
  HeapSnapshotPointer snapshot {
      env->isolate()->GetHeapProfiler()->TakeHeapSnapshot() };
  CHECK(snapshot);
  BaseObjectPtr<AsyncWrap> stream =
      CreateHeapSnapshotStream(env, std::move(snapshot));
  if (stream)
    args.GetReturnValue().Set(stream->object());
}

void TriggerHeapSnapshot(const FunctionCallbackInfo<Value>& args) {
  Environment* env = Environment::GetCurrent(args);
  Isolate* isolate = args.GetIsolate();

  Local<Value> filename_v = args[0];

  if (filename_v->IsUndefined()) {
    DiagnosticFilename name(env, "Heap", "heapsnapshot");
    if (WriteSnapshot(env, *name).IsNothing())
      return;
    if (String::NewFromUtf8(isolate, *name).ToLocal(&filename_v)) {
      args.GetReturnValue().Set(filename_v);
    }
    return;
  }

  BufferValue path(isolate, filename_v);
  CHECK_NOT_NULL(*path);
  if (WriteSnapshot(env, *path).IsNothing())
    return;
  return args.GetReturnValue().Set(filename_v);
}

void Initialize(Local<Object> target,
                Local<Value> unused,
                Local<Context> context,
                void* priv) {
  SetMethod(context, target, "buildEmbedderGraph", BuildEmbedderGraph);
  SetMethod(context, target, "triggerHeapSnapshot", TriggerHeapSnapshot);
  SetMethod(
      context, target, "createHeapSnapshotStream", CreateHeapSnapshotStream);
}

void RegisterExternalReferences(ExternalReferenceRegistry* registry) {
  registry->Register(BuildEmbedderGraph);
  registry->Register(TriggerHeapSnapshot);
  registry->Register(CreateHeapSnapshotStream);
}

}  // namespace heap
}  // namespace node

NODE_MODULE_CONTEXT_AWARE_INTERNAL(heap_utils, node::heap::Initialize)
NODE_MODULE_EXTERNAL_REFERENCE(heap_utils,
                               node::heap::RegisterExternalReferences)


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			#include "diagnosticfilename-inl.h"
2			#include "env-inl.h"
3			#include "memory_tracker-inl.h"
4			#include "node_external_reference.h"
5			#include "stream_base-inl.h"
6			#include "util-inl.h"
7
8			// Copied from https://github.com/nodejs/node/blob/b07dc4d19fdbc15b4f76557dc45b3ce3a43ad0c3/src/util.cc#L36-L41.
9			#ifdef _WIN32
10			#include <io.h> // _S_IREAD _S_IWRITE
11			#ifndef S_IRUSR
12			#define S_IRUSR _S_IREAD
13			#endif // S_IRUSR
14			#ifndef S_IWUSR
15			#define S_IWUSR _S_IWRITE
16			#endif // S_IWUSR
17			#endif
18
19			using v8::Array;
20			using v8::Boolean;
21			using v8::Context;
22			using v8::EmbedderGraph;
23			using v8::EscapableHandleScope;
24			using v8::FunctionCallbackInfo;
25			using v8::FunctionTemplate;
26			using v8::Global;
27			using v8::HandleScope;
28			using v8::HeapSnapshot;
29			using v8::Isolate;
30			using v8::JustVoid;
31			using v8::Local;
32			using v8::Maybe;
33			using v8::MaybeLocal;
34			using v8::Nothing;
35			using v8::Number;
36			using v8::Object;
37			using v8::ObjectTemplate;
38			using v8::String;
39			using v8::Value;
40
41			namespace node {
42			namespace heap {
43
44			class JSGraphJSNode : public EmbedderGraph::Node {
45			public:
46			const char* Name() override { return "<JS Node>"; }
47			size_t SizeInBytes() override { return 0; }
48			bool IsEmbedderNode() override { return false; }
49			Local<Value> JSValue() { return PersistentToLocal::Strong(persistent_); }
50
51			int IdentityHash() {
52			Local<Value> v = JSValue();
53			if (v->IsObject()) return v.As<Object>()->GetIdentityHash();
54			if (v->IsName()) return v.As<v8::Name>()->GetIdentityHash();
55			if (v->IsInt32()) return v.As<v8::Int32>()->Value();
56			return 0;
57			}
58
59			JSGraphJSNode(Isolate* isolate, Local<Value> val)
60			: persistent_(isolate, val) {
61			CHECK(!val.IsEmpty());
62			}
63
64			struct Hash {
65			inline size_t operator()(JSGraphJSNode* n) const {
66			return static_cast<size_t>(n->IdentityHash());
67			}
68			};
69
70			struct Equal {
71			inline bool operator()(JSGraphJSNode* a, JSGraphJSNode* b) const {
72			return a->JSValue()->SameValue(b->JSValue());
73			}
74			};
75
76			private:
77			Global<Value> persistent_;
78			};
79
80			class JSGraph : public EmbedderGraph {
81			public:
82			explicit JSGraph(Isolate* isolate) : isolate_(isolate) {}
83
84			Node* V8Node(const Local<Value>& value) override {
85			std::unique_ptr<JSGraphJSNode> n { new JSGraphJSNode(isolate_, value) };
86			auto it = engine_nodes_.find(n.get());
87			if (it != engine_nodes_.end())
88			return *it;
89			engine_nodes_.insert(n.get());
90			return AddNode(std::unique_ptr<Node>(n.release()));
91			}
92
93			Node* AddNode(std::unique_ptr<Node> node) override {
94			Node* n = node.get();
95			nodes_.emplace(std::move(node));
96			return n;
97			}
98
99			void AddEdge(Node* from, Node* to, const char* name = nullptr) override {
100			edges_[from].insert(std::make_pair(name, to));
101			}
102
103			MaybeLocal<Array> CreateObject() const {
104			EscapableHandleScope handle_scope(isolate_);
105			Local<Context> context = isolate_->GetCurrentContext();
106			Environment* env = Environment::GetCurrent(context);
107
108			std::unordered_map<Node*, Local<Object>> info_objects;
109			Local<Array> nodes = Array::New(isolate_, nodes_.size());
110			Local<String> edges_string = FIXED_ONE_BYTE_STRING(isolate_, "edges");
111			Local<String> is_root_string = FIXED_ONE_BYTE_STRING(isolate_, "isRoot");
112			Local<String> name_string = env->name_string();
113			Local<String> size_string = env->size_string();
114			Local<String> value_string = env->value_string();
115			Local<String> wraps_string = FIXED_ONE_BYTE_STRING(isolate_, "wraps");
116			Local<String> to_string = FIXED_ONE_BYTE_STRING(isolate_, "to");
117
118			for (const std::unique_ptr<Node>& n : nodes_)
119			info_objects[n.get()] = Object::New(isolate_);
120
121			{
122			HandleScope handle_scope(isolate_);
123			size_t i = 0;
124			for (const std::unique_ptr<Node>& n : nodes_) {
125			Local<Object> obj = info_objects[n.get()];
126			Local<Value> value;
127			std::string name_str;
128			const char* prefix = n->NamePrefix();
129			if (prefix == nullptr) {
130			name_str = n->Name();
131			} else {
132			name_str = n->NamePrefix();
133			name_str += " ";
134			name_str += n->Name();
135			}
136			if (!String::NewFromUtf8(isolate_, name_str.c_str()).ToLocal(&value) \|\|
137			obj->Set(context, name_string, value).IsNothing() \|\|
138			obj->Set(context,
139			is_root_string,
140			Boolean::New(isolate_, n->IsRootNode()))
141			.IsNothing() \|\|
142			obj->Set(
143			context,
144			size_string,
145			Number::New(isolate_, static_cast<double>(n->SizeInBytes())))
146			.IsNothing() \|\|
147			obj->Set(context, edges_string, Array::New(isolate_)).IsNothing()) {
148			return MaybeLocal<Array>();
149			}
150			if (nodes->Set(context, i++, obj).IsNothing())
151			return MaybeLocal<Array>();
152			if (!n->IsEmbedderNode()) {
153			value = static_cast<JSGraphJSNode*>(n.get())->JSValue();
154			if (obj->Set(context, value_string, value).IsNothing())
155			return MaybeLocal<Array>();
156			}
157			}
158			}
159
160			for (const std::unique_ptr<Node>& n : nodes_) {
161			Node* wraps = n->WrapperNode();
162			if (wraps == nullptr) continue;
163			Local<Object> from = info_objects[n.get()];
164			Local<Object> to = info_objects[wraps];
165			if (from->Set(context, wraps_string, to).IsNothing())
166			return MaybeLocal<Array>();
167			}
168
169			for (const auto& edge_info : edges_) {
170			Node* source = edge_info.first;
171			Local<Value> edges;
172			if (!info_objects[source]->Get(context, edges_string).ToLocal(&edges) \|\|
173			!edges->IsArray()) {
174			return MaybeLocal<Array>();
175			}
176
177			size_t i = 0;
178			size_t j = 0;
179			for (const auto& edge : edge_info.second) {
180			Local<Object> to_object = info_objects[edge.second];
181			Local<Object> edge_obj = Object::New(isolate_);
182			Local<Value> edge_name_value;
183			const char* edge_name = edge.first;
184			if (edge_name != nullptr) {
185			if (!String::NewFromUtf8(isolate_, edge_name)
186			.ToLocal(&edge_name_value)) {
187			return MaybeLocal<Array>();
188			}
189			} else {
190			edge_name_value = Number::New(isolate_, static_cast<double>(j++));
191			}
192			if (edge_obj->Set(context, name_string, edge_name_value).IsNothing() \|\|
193			edge_obj->Set(context, to_string, to_object).IsNothing() \|\|
194			edges.As<Array>()->Set(context, i++, edge_obj).IsNothing()) {
195			return MaybeLocal<Array>();
196			}
197			}
198			}
199
200			return handle_scope.Escape(nodes);
201			}
202
203			private:
204			Isolate* isolate_;
205			std::unordered_set<std::unique_ptr<Node>> nodes_;
206			std::unordered_set<JSGraphJSNode*, JSGraphJSNode::Hash, JSGraphJSNode::Equal>
207			engine_nodes_;
208			std::unordered_map<Node, std::set<std::pair<const char, Node*>>> edges_;
209			};
210
211			void BuildEmbedderGraph(const FunctionCallbackInfo<Value>& args) {
212			Environment* env = Environment::GetCurrent(args);
213			JSGraph graph(env->isolate());
214			Environment::BuildEmbedderGraph(env->isolate(), &graph, env);
215			Local<Array> ret;
216			if (graph.CreateObject().ToLocal(&ret))
217			args.GetReturnValue().Set(ret);
218			}
219
220			namespace {
221			class FileOutputStream : public v8::OutputStream {
222			public:
223		5	FileOutputStream(const int fd, uv_fs_t* req) : fd_(fd), req_(req) {}
224
225		10	int GetChunkSize() override {
226		10	return 65536; // big chunks == faster
227			}
228
229		5	void EndOfStream() override {}
230
231		395	WriteResult WriteAsciiChunk(char* data, const int size) override {
232			DCHECK_EQ(status_, 0);
233		395	int offset = 0;
234	✓✓	790	while (offset < size) {
235		395	const uv_buf_t buf = uv_buf_init(data + offset, size - offset);
236		395	const int num_bytes_written = uv_fs_write(nullptr,
237			req_,
238		395	fd_,
239			&buf,
240			1,
241			-1,
242			nullptr);
243		395	uv_fs_req_cleanup(req_);
244	✗✓	395	if (num_bytes_written < 0) {
245			status_ = num_bytes_written;
246			return kAbort;
247			}
248			DCHECK_LE(static_cast<size_t>(num_bytes_written), buf.len);
249		395	offset += num_bytes_written;
250			}
251			DCHECK_EQ(offset, size);
252		395	return kContinue;
253			}
254
255		5	int status() const { return status_; }
256
257			private:
258			const int fd_;
259			uv_fs_t* req_;
260			int status_ = 0;
261			};
262
263			class HeapSnapshotStream : public AsyncWrap,
264			public StreamBase,
265			public v8::OutputStream {
266			public:
267		16	HeapSnapshotStream(
268			Environment* env,
269			HeapSnapshotPointer&& snapshot,
270		16	Local<Object> obj) :
271			AsyncWrap(env, obj, AsyncWrap::PROVIDER_HEAPSNAPSHOT),
272			StreamBase(env),
273		16	snapshot_(std::move(snapshot)) {
274		16	MakeWeak();
275		16	StreamBase::AttachToObject(GetObject());
276		16	}
277
278		64	~HeapSnapshotStream() override {}
279
280		26	int GetChunkSize() override {
281		26	return 65536; // big chunks == faster
282			}
283
284		13	void EndOfStream() override {
285		13	EmitRead(UV_EOF);
286		13	snapshot_.reset();
287		13	}
288
289		1032	WriteResult WriteAsciiChunk(char* data, int size) override {
290		1032	int len = size;
291	✓✓	2064	while (len != 0) {
292		1032	uv_buf_t buf = EmitAlloc(size);
293		1032	ssize_t avail = len;
294	✗✓	1032	if (static_cast<ssize_t>(buf.len) < avail)
295			avail = buf.len;
296		1032	memcpy(buf.base, data, avail);
297		1032	data += avail;
298		1032	len -= static_cast<int>(avail);
299		1032	EmitRead(size, buf);
300			}
301		1032	return kContinue;
302			}
303
304		13	int ReadStart() override {
305	✗✓	13	CHECK_NE(snapshot_, nullptr);
306		13	snapshot_->Serialize(this, HeapSnapshot::kJSON);
307		13	return 0;
308			}
309
310		1032	int ReadStop() override {
311		1032	return 0;
312			}
313
314			int DoShutdown(ShutdownWrap* req_wrap) override {
315			UNREACHABLE();
316			}
317
318			int DoWrite(WriteWrap* w,
319			uv_buf_t* bufs,
320			size_t count,
321			uv_stream_t* send_handle) override {
322			UNREACHABLE();
323			}
324
325		1045	bool IsAlive() override { return snapshot_ != nullptr; }
326			bool IsClosing() override { return snapshot_ == nullptr; }
327		2106	AsyncWrap* GetAsyncWrap() override { return this; }
328
329		7	void MemoryInfo(MemoryTracker* tracker) const override {
330	✓✗	7	if (snapshot_ != nullptr) {
331		7	tracker->TrackFieldWithSize(
332			"snapshot", sizeof(*snapshot_), "HeapSnapshot");
333			}
334		7	}
335
336		7	SET_MEMORY_INFO_NAME(HeapSnapshotStream)
337		7	SET_SELF_SIZE(HeapSnapshotStream)
338
339			private:
340			HeapSnapshotPointer snapshot_;
341			};
342
343		5	inline void TakeSnapshot(Environment* env, v8::OutputStream* out) {
344			HeapSnapshotPointer snapshot {
345		10	env->isolate()->GetHeapProfiler()->TakeHeapSnapshot() };
346		5	snapshot->Serialize(out, HeapSnapshot::kJSON);
347		5	}
348
349			} // namespace
350
351		6	Maybe<void> WriteSnapshot(Environment* env, const char* filename) {
352			uv_fs_t req;
353			int err;
354
355		6	const int fd = uv_fs_open(nullptr,
356			&req,
357			filename,
358			O_WRONLY \| O_CREAT \| O_TRUNC,
359			S_IWUSR \| S_IRUSR,
360			nullptr);
361		6	uv_fs_req_cleanup(&req);
362	✓✓	6	if ((err = fd) < 0) {
363		1	env->ThrowUVException(err, "open", nullptr, filename);
364		1	return Nothing<void>();
365			}
366
367		10	FileOutputStream stream(fd, &req);
368		5	TakeSnapshot(env, &stream);
369	✗✓	5	if ((err = stream.status()) < 0) {
370			env->ThrowUVException(err, "write", nullptr, filename);
371			return Nothing<void>();
372			}
373
374		5	err = uv_fs_close(nullptr, &req, fd, nullptr);
375		5	uv_fs_req_cleanup(&req);
376	✗✓	5	if (err < 0) {
377			env->ThrowUVException(err, "close", nullptr, filename);
378			return Nothing<void>();
379			}
380
381		5	return JustVoid();
382			}
383
384		21	void DeleteHeapSnapshot(const HeapSnapshot* snapshot) {
385		21	const_cast<HeapSnapshot*>(snapshot)->Delete();
386		21	}
387
388		16	BaseObjectPtr<AsyncWrap> CreateHeapSnapshotStream(
389			Environment* env, HeapSnapshotPointer&& snapshot) {
390		32	HandleScope scope(env->isolate());
391
392	✓✓	32	if (env->streambaseoutputstream_constructor_template().IsEmpty()) {
393			// Create FunctionTemplate for HeapSnapshotStream
394		7	Local<FunctionTemplate> os = FunctionTemplate::New(env->isolate());
395		7	os->Inherit(AsyncWrap::GetConstructorTemplate(env));
396		7	Local<ObjectTemplate> ost = os->InstanceTemplate();
397		7	ost->SetInternalFieldCount(StreamBase::kInternalFieldCount);
398		7	os->SetClassName(
399			FIXED_ONE_BYTE_STRING(env->isolate(), "HeapSnapshotStream"));
400		7	StreamBase::AddMethods(env, os);
401		7	env->set_streambaseoutputstream_constructor_template(ost);
402			}
403
404			Local<Object> obj;
405		16	if (!env->streambaseoutputstream_constructor_template()
406		16	->NewInstance(env->context())
407	✗✓	16	.ToLocal(&obj)) {
408			return {};
409			}
410		16	return MakeBaseObject<HeapSnapshotStream>(env, std::move(snapshot), obj);
411			}
412
413		15	void CreateHeapSnapshotStream(const FunctionCallbackInfo<Value>& args) {
414		15	Environment* env = Environment::GetCurrent(args);
415			HeapSnapshotPointer snapshot {
416		30	env->isolate()->GetHeapProfiler()->TakeHeapSnapshot() };
417	✗✓	15	CHECK(snapshot);
418			BaseObjectPtr<AsyncWrap> stream =
419		30	CreateHeapSnapshotStream(env, std::move(snapshot));
420	✓✗	15	if (stream)
421		30	args.GetReturnValue().Set(stream->object());
422		15	}
423
424		5	void TriggerHeapSnapshot(const FunctionCallbackInfo<Value>& args) {
425		5	Environment* env = Environment::GetCurrent(args);
426	✓✗	5	Isolate* isolate = args.GetIsolate();
427
428		5	Local<Value> filename_v = args[0];
429
430	✓✓	10	if (filename_v->IsUndefined()) {
431		6	DiagnosticFilename name(env, "Heap", "heapsnapshot");
432	✗✓	6	if (WriteSnapshot(env, *name).IsNothing())
433			return;
434	✓✗	6	if (String::NewFromUtf8(isolate, *name).ToLocal(&filename_v)) {
435		6	args.GetReturnValue().Set(filename_v);
436			}
437		3	return;
438			}
439
440		4	BufferValue path(isolate, filename_v);
441	✗✓	2	CHECK_NOT_NULL(*path);
442	✓✓	4	if (WriteSnapshot(env, *path).IsNothing())
443		1	return;
444		2	return args.GetReturnValue().Set(filename_v);
445			}
446
447		771	void Initialize(Local<Object> target,
448			Local<Value> unused,
449			Local<Context> context,
450			void* priv) {
451		771	SetMethod(context, target, "buildEmbedderGraph", BuildEmbedderGraph);
452		771	SetMethod(context, target, "triggerHeapSnapshot", TriggerHeapSnapshot);
453		771	SetMethod(
454			context, target, "createHeapSnapshotStream", CreateHeapSnapshotStream);
455		771	}
456
457		5337	void RegisterExternalReferences(ExternalReferenceRegistry* registry) {
458		5337	registry->Register(BuildEmbedderGraph);
459		5337	registry->Register(TriggerHeapSnapshot);
460		5337	registry->Register(CreateHeapSnapshotStream);
461		5337	}
462
463			} // namespace heap
464			} // namespace node
465
466		5409	NODE_MODULE_CONTEXT_AWARE_INTERNAL(heap_utils, node::heap::Initialize)
467		5337	NODE_MODULE_EXTERNAL_REFERENCE(heap_utils,
468			node::heap::RegisterExternalReferences)