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doc: add relnotes for stack objects and mid-stack inlining
Change-Id: Ief11612b67def93311707165910124d3ce28fb89 Reviewed-on: https://go-review.googlesource.com/c/151777 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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@ -66,6 +66,48 @@ Go 1.13 will require macOS 10.11 El Capitan or later.
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has no effect in Go 1.12.
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</p>
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<h3 id="compiler">Compiler toolchain</h3>
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<p><!-- CL 134155, 134156 -->
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The compiler's live variable analysis has improved. This may mean that
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finalizers will be executed sooner in this release than in previous
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releases. If that is a problem, consider the appropriate addition of a
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<a href="/pkg/runtime/#KeepAlive"><code>runtime.KeepAlive</code></a> call.
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</p>
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<p><!-- CL 147361 -->
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More functions are now eligible for inlining by default, including
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functions that do nothing but call another function.
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This extra inlining makes it additionally important to use
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<a href="/pkg/runtime/#CallersFrames"><code>runtime.CallersFrames</code></a>
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instead of iterating over the result of
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<a href="/pkg/runtime/#Callers"><code>runtime.Callers</code></a> directly.
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<pre>
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// Old code which no longer works correctly (it will miss inlined call frames).
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var pcs [10]uintptr
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n := runtime.Callers(1, pcs[:])
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for _, pc := range pcs[:n] {
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f := runtime.FuncForPC(pc)
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if f != nil {
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fmt.Println(f.Name())
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}
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}
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</pre>
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<pre>
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// New code which will work correctly.
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var pcs [10]uintptr
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n := runtime.Callers(1, pcs[:])
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frames := runtime.CallersFrames(pcs[:n])
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for {
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frame, more := frames.Next()
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fmt.Println(frame.Function)
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if !more {
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break
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}
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}
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</pre>
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</p>
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<h3 id="godoc">Godoc</h3>
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<p>
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