go/src/runtime/traceback_system_test.go

// This is the entrypoint of the child process used by
// TestTracebackSystem. It prints a crash report to stdout.
func crash() { … }

func child1() { … }

func child2() { … }

func child3() { … }

func child4() { … }

//go:noinline
func child5() { … }

//go:noinline
func child6bad() { … }

//go:noinline
func child6() { … }

//go:noinline
func child7bad() { … }

//go:noinline
func child7() { … }

// TestTracebackSystem tests that the syntax of crash reports produced
// by GOTRACEBACK=system (see traceback2) contains a complete,
// parseable list of program counters for the running goroutine that
// can be parsed and fed to runtime.CallersFrames to obtain accurate
// information about the logical call stack, even in the presence of
// inlining.
//
// The test is a distillation of the crash monitor in
// golang.org/x/telemetry/crashmonitor.
func TestTracebackSystem(t *testing.T) { … }

// parseStackPCs parses the parent process's program counters for the
// first running goroutine out of a GOTRACEBACK=system traceback,
// adjusting them so that they are valid for the child process's text
// segment.
//
// This function returns only program counter values, ensuring that
// there is no possibility of strings from the crash report (which may
// contain PII) leaking into the telemetry system.
//
// (Copied from golang.org/x/telemetry/crashmonitor.parseStackPCs.)
func parseStackPCs(crash string) ([]uintptr, error) { … }

// The sentinel function returns its address. The difference between
// this value as observed by calls in two different processes of the
// same executable tells us the relative offset of their text segments.
//
// It would be nice if SetCrashOutput took care of this as it's fiddly
// and likely to confuse every user at first.
func sentinel() uint64 { … }

func writeSentinel(out io.Writer) { … }

// formatStack formats a stack of PC values using the symbol table,
// redacting information that cannot be relied upon in the test.
func formatStack(pcs []uintptr) string { … }