Method stack

internal/bisect/bisect.go:441–485

stack does the real work for Stack. This lets stack's body handle m == nil and potentially be inlined.

(w Writer)

// stack does the real work for Stack.
// This lets stack's body handle m == nil and potentially be inlined.
func (m *Matcher) stack(w Writer) bool {
	const maxStack = 16
	var stk [maxStack]uintptr
	n := runtime.Callers(2, stk[:])
	// caller #2 is not for printing; need it to normalize PCs if ASLR.
	if n <= 1 {
		return false
	}

	base := stk[0]
	// normalize PCs
	for i := range stk[:n] {
		stk[i] -= base
	}

	h := Hash(stk[:n])
	if m.ShouldPrint(h) {
		var d *dedup
		for {
			d = m.dedup.Load()
			if d != nil {
				break
			}
			d = new(dedup)
			if m.dedup.CompareAndSwap(nil, d) {
				break
			}
		}

		if m.MarkerOnly() {
			if !d.seenLossy(h) {
				PrintMarker(w, h)
			}
		} else {
			if !d.seen(h) {
				// Restore PCs in stack for printing
				for i := range stk[:n] {
					stk[i] += base
				}
				printStack(w, h, stk[1:n])
			}
		}
	}
	return m.ShouldEnable(h)
}

// Writer is the same interface as io.Writer.
// It is duplicated here to avoid importing io.