clang::clangd::trace Namespace Reference

Classes
class	EventTracer
	A consumer of trace events and measurements. More...
struct	Metric
	Represents measurements of clangd events, e.g. More...
class	Session
	Sets up a global EventTracer that consumes events produced by Span and trace::log. More...
class	Span
	Records an event whose duration is the lifetime of the Span object. More...
class	TestTracer
	A RAII Tracer that can be used by tests. More...

Functions
std::unique_ptr< EventTracer >	createJSONTracer (llvm::raw_ostream &OS, bool Pretty=false)
	Create an instance of EventTracer that produces an output in the Trace Event format supported by Chrome's trace viewer (chrome://tracing).
std::unique_ptr< EventTracer >	createCSVMetricTracer (llvm::raw_ostream &OS)
	Create an instance of EventTracer that outputs metric measurements as CSV.
void	log (const llvm::Twine &Name)
	Records a single instant event, associated with the current thread.
bool	enabled ()
	Returns true if there is an active tracer.
static std::pair< Context, llvm::json::Object * >	makeSpanContext (llvm::Twine Name, const Metric &LatencyMetric)
constexpr Metric	SpanLatency ("span_latency", Metric::Distribution, "span_name")

Function Documentation

createCSVMetricTracer()

std::unique_ptr< EventTracer > clang::clangd::trace::createCSVMetricTracer

(

llvm::raw_ostream &

OS

)

Create an instance of EventTracer that outputs metric measurements as CSV.

Trace spans and instant events are ignored.

Definition at line 273 of file Trace.cpp.

Referenced by clang::clangd::clangdMain().

createJSONTracer()

std::unique_ptr< EventTracer > clang::clangd::trace::createJSONTracer	(	llvm::raw_ostream &	OS,
		bool	Pretty = false )

Create an instance of EventTracer that produces an output in the Trace Event format supported by Chrome's trace viewer (chrome://tracing).

FIXME: Metrics are not recorded, some could become counter events.

The format is documented here: https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview

Definition at line 268 of file Trace.cpp.

Referenced by clang::clangd::clangdMain(), and main().

enabled()

bool clang::clangd::trace::enabled

(

)

Returns true if there is an active tracer.

Definition at line 283 of file Trace.cpp.

log()

void clang::clangd::trace::log

(

const llvm::Twine &

Message

)

Records a single instant event, associated with the current thread.

Definition at line 277 of file Trace.cpp.

Referenced by clang::clangd::StreamLogger::log().

makeSpanContext()

std::pair< Context, llvm::json::Object * > clang::clangd::trace::makeSpanContext ( llvm::Twine Name, const Metric & LatencyMetric )

static

Definition at line 287 of file Trace.cpp.

References clang::clangd::Context::current().

Referenced by clang::clangd::trace::Span::Span().

SpanLatency()

Metric clang::clangd::trace::SpanLatency ( "span_latency" , Metric::Distribution , "span_name"  )

constexpr

References clang::clangd::trace::Metric::Distribution.

Referenced by clang::clangd::trace::Span::Span().