ilya-biryukov updated this revision to Diff 126329.
ilya-biryukov added a comment.
Updated the patch after changes to Context
Repository:
rCTE Clang Tools Extra
https://reviews.llvm.org/D40489
Files:
clangd/Trace.cpp
clangd/Trace.h
Index: clangd/Trace.h
===================================================================
--- clangd/Trace.h
+++ clangd/Trace.h
@@ -28,12 +28,21 @@
namespace trace {
/// A consumer of trace events. The events are produced by Spans and trace::log.
+/// Calls to begin_event and end_event with the same name are always properly
+/// nested by using a RAII object (Span).
+/// Implmentations of this interface must be thread-safe.
class EventTracer {
public:
virtual ~EventTracer() = default;
- /// Consume a trace event.
- virtual void event(const Context &Ctx, llvm::StringRef Phase,
- json::obj &&Contents) = 0;
+
+ /// Called when event with \p Name starts.
+ virtual void begin_event(const Context &Ctx, llvm::StringRef Name) = 0;
+ /// Called when event with \p Name ends.
+ virtual void end_event(const Context &Ctx, llvm::StringRef Name,
+ json::obj &&Args) = 0;
+ /// Called for instant events.
+ virtual void instant_event(const Context &Ctx, llvm::StringRef Name,
+ json::obj &&Args) = 0;
};
/// Sets up a global EventTracer that consumes events produced by Span and
@@ -67,15 +76,16 @@
/// SomeJSONExpr is evaluated and copied only if actually needed.
class Span {
public:
- Span(const Context &Ctx, std::string Name);
+ Span(const Context &Ctx, llvm::StringRef Name);
~Span();
/// Returns mutable span metadata if this span is interested.
/// Prefer to use SPAN_ATTACH rather than accessing this directly.
json::obj *args() { return Args.get(); }
private:
llvm::Optional<Context> Ctx;
+ std::string Name;
std::unique_ptr<json::obj> Args;
};
Index: clangd/Trace.cpp
===================================================================
--- clangd/Trace.cpp
+++ clangd/Trace.cpp
@@ -44,10 +44,23 @@
Out.flush();
}
+ void begin_event(const Context &Ctx, llvm::StringRef Name) override {
+ jsonEvent("B", json::obj{{"name", Name}});
+ }
+
+ void end_event(const Context &Ctx, llvm::StringRef Name,
+ json::obj &&Args) override {
+ jsonEvent("E", json::obj{{"args", std::move(Args)}});
+ }
+
+ void instant_event(const Context &Ctx, llvm::StringRef Name,
+ json::obj &&Args) override {
+ jsonEvent("i", json::obj{{"name", Name}, {"args", std::move(Args)}});
+ }
+
// Record an event on the current thread. ph, pid, tid, ts are set.
// Contents must be a list of the other JSON key/values.
- void event(const Context &Ctx, StringRef Phase,
- json::obj &&Contents) override {
+ void jsonEvent(StringRef Phase, json::obj &&Contents) {
uint64_t TID = get_threadid();
std::lock_guard<std::mutex> Lock(Mu);
// If we haven't already, emit metadata describing this thread.
@@ -109,30 +122,24 @@
void log(const Context &Ctx, const Twine &Message) {
if (!T)
return;
- T->event(Ctx, "i",
- json::obj{
- {"name", "Log"},
- {"args", json::obj{{"Message", Message.str()}}},
- });
+ T->instant_event(Ctx, "Log", json::obj{{"Message", Message.str()}});
}
-Span::Span(const Context &Ctx, std::string Name) {
+Span::Span(const Context &Ctx, llvm::StringRef Name) : Name(Name) {
if (!T)
return;
// Clone the context, so that the original Context can be moved.
this->Ctx.emplace(Ctx.clone());
- T->event(*this->Ctx, "B", json::obj{{"name", std::move(Name)}});
+ T->begin_event(*this->Ctx, this->Name);
Args = llvm::make_unique<json::obj>();
}
Span::~Span() {
if (!T)
return;
- if (!Args)
- Args = llvm::make_unique<json::obj>();
- T->event(*Ctx, "E",
- Args ? json::obj{{"args", std::move(*Args)}} : json::obj{});
+ assert(Args && "Args can't be null at this point");
+ T->end_event(*this->Ctx, Name, std::move(*Args));
}
} // namespace trace
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