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  1. 05 Oct, 2016 9 commits
    • Brad Fitzpatrick's avatar
      sort: fix a slice benchmark not using the stable variant, add another · aad29eba
      Brad Fitzpatrick authored 
      Change-Id: I9783d8023d453a72c4605a308064bef98168bcb8
Reviewed-on: https://go-review.googlesource.com/30360Reviewed-by: default avatarIan Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
      aad29eba
    • Aliaksandr Valialkin's avatar
      cmd/vet: skip printf check for non-constant format string during failed import · ee8ec429
      Aliaksandr Valialkin authored 
      Fixes #17006

Change-Id: I3c2060ca5384a4b9782a7d804305d2cf4388dd5a
Reviewed-on: https://go-review.googlesource.com/29014
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: default avatarRob Pike <r@golang.org>
      ee8ec429
    • Ian Lance Taylor's avatar
      runtime: don't call cgocallback from signal handler · 6c13a1db
      Ian Lance Taylor authored 
      Calling cgocallback from a signal handler can fail when using the race
detector. Calling cgocallback will lead to a call to newextram which
will call oneNewExtraM which will call racegostart. The racegostart
function will set up some race detector data structures, and doing that
will sometimes call the C memory allocator. If we are running the signal
handler from a signal that interrupted the C memory allocator, we will
crash or hang.

Instead, change the signal handler code to call needm and dropm. The
needm function will grab allocated m and g structures and initialize the
g to use the current stack--the signal stack. That is all we need to
safely call code that allocates memory and checks whether it needs to
split the stack. This may temporarily leave us with no m available to
run a cgo callback, but that is OK in this case since the code we call
will quickly either crash or call dropm to return the m.

Implementing this required changing some of the setSignalstackSP
functions to avoid a write barrier. These functions never need a write
barrier but in some cases generated one anyhow because on some systems
the ss_sp field is a pointer.

Change-Id: I3893f47c3a66278f85eab7f94c1ab11d4f3be133
Reviewed-on: https://go-review.googlesource.com/30218
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: default avatarDmitry Vyukov <dvyukov@google.com>
      6c13a1db
    • Ian Lance Taylor's avatar
      runtime: avoid endless loop if printing the panic value panics · 7faf7023
      Ian Lance Taylor authored 
      Change-Id: I56de359a5ccdc0a10925cd372fa86534353c6ca0
Reviewed-on: https://go-review.googlesource.com/30358
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: default avatarBrad Fitzpatrick <bradfitz@golang.org>
      7faf7023
    • Brad Fitzpatrick's avatar
      encoding/csv: update and add CSV reading benchmarks · efaa3601
      Brad Fitzpatrick authored 
      Benchmarks broken off from https://golang.org/cl/24723 and modified to
allocate less in the places we're not trying to measure.

Updates #16791

Change-Id: I508e4cfeac60322d56f1d71ff1912f6a6f183a63
Reviewed-on: https://go-review.googlesource.com/30357
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: default avatarBrad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
      efaa3601
    • Jeff R. Allen's avatar
      image/gif: check handling of truncated GIF files · d1d798dd
      Jeff R. Allen authored 
      All the prefixes of the testGIF produce errors today,
but they differ wildly in which errors: some are io.EOF,
others are io.ErrUnexpectedEOF, and others are gif-specific.
Make them all gif-specific to explain context, and make
any complaining about EOF be sure to mention the EOF
is unexpected.

Fixes #11390.

Change-Id: I742c39c88591649276268327ea314e68d1de1845
Reviewed-on: https://go-review.googlesource.com/17493
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: default avatarBrad Fitzpatrick <bradfitz@golang.org>
      d1d798dd
    • Russ Cox's avatar
      math: fix Gamma(x) for x < -170.5 and other corner cases · a39920fd
      Russ Cox authored 
      Fixes #11441.

Test tables generated by

	package main

	import (
		"bytes"
		"fmt"
		"log"
		"os/exec"
		"strconv"
		"strings"
	)

	var inputs = []float64{
		0.5,
		1.5,
		2.5,
		3.5,
		-0.5,
		-1.5,
		-2.5,
		-3.5,
		0.1,
		0.01,
		1e-8,
		1e-16,
		1e-3,
		1e-16,
		1e-308,
		5.6e-309,
		5.5e-309,
		1e-309,
		1e-323,
		5e-324,
		-0.1,
		-0.01,
		-1e-8,
		-1e-16,
		-1e-3,
		-1e-16,
		-1e-308,
		-5.6e-309,
		-5.5e-309,
		-1e-300 / 1e9,
		-1e-300 / 1e23,
		-5e-300 / 1e24,
		-0.9999999999999999,
		-1.0000000000000002,
		-1.9999999999999998,
		-2.0000000000000004,
		-100.00000000000001,
		-99.999999999999986,
		17,
		171,
		171.6,
		171.624,
		171.625,
		172,
		2000,
		-100.5,
		-160.5,
		-170.5,
		-171.5,
		-176.5,
		-177.5,
		-178.5,
		-179.5,
		-201.0001,
		-202.9999,
		-1000.5,
		-1000000000.3,
		-4503599627370495.5,
		-63.349078729022985,
		-127.45117632943295,
	}

	func main() {
		var buf bytes.Buffer
		for _, v := range inputs {
			fmt.Fprintf(&buf, "gamma(%.1000g)\n", v)
		}
		cmd := exec.Command("gp", "-q")
		cmd.Stdin = &buf
		out, err := cmd.CombinedOutput()
		if err != nil {
			log.Fatalf("gp: %v", err)
		}
		f := strings.Split(string(out), "\n")
		if len(f) > 0 && f[len(f)-1] == "" {
			f = f[:len(f)-1]
		}
		if len(f) != len(inputs) {
			log.Fatalf("gp: wrong output count\n%s\n", out)
		}
		for i, g := range f {
			gf, err := strconv.ParseFloat(strings.Replace(g, " E", "e", -1), 64)
			if err != nil {
				if strings.Contains(err.Error(), "value out of range") {
					if strings.HasPrefix(g, "-") {
						fmt.Printf("\t{%g, Inf(-1)},\n", inputs[i])
					} else {
						fmt.Printf("\t{%g, Inf(1)},\n", inputs[i])
					}
					continue
				}
				log.Fatal(err)
			}
			if gf == 0 && strings.HasPrefix(g, "-") {
				fmt.Printf("\t{%g, Copysign(0, -1)},\n", inputs[i])
				continue
			}
			fmt.Printf("\t{%g, %g},\n", inputs[i], gf)
		}
	}

Change-Id: Ie98c7751d92b8ffb40e8313f5ea10df0890e2feb
Reviewed-on: https://go-review.googlesource.com/30146
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: default avatarQuentin Smith <quentin@golang.org>
      a39920fd
    • Russ Cox's avatar
      math: use portable Exp instead of 387 instructions on 386 · aab849e4
      Russ Cox authored 
      The 387 implementation is less accurate and slower.

name     old time/op  new time/op  delta
Exp-8    29.7ns ± 2%  24.0ns ± 2%  -19.08%  (p=0.000 n=10+10)

This makes Gamma more accurate too.

Change-Id: Iad33b9cce0b087ccbce3e08ba7a6d285c4999d02
Reviewed-on: https://go-review.googlesource.com/30230
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: default avatarQuentin Smith <quentin@golang.org>
Reviewed-by: default avatarBrad Fitzpatrick <bradfitz@golang.org>
      aab849e4
    • Joe Tsai's avatar
      cmd/doc: ensure summaries truly are only one line · 84743c34
      Joe Tsai authored 
      The documentation for doc says:
> Doc prints the documentation comments associated with the item identified by its
> arguments (a package, const, func, type, var, or method) followed by a one-line
> summary of each of the first-level items "under" that item (package-level
> declarations for a package, methods for a type, etc.).

Certain variables (and constants, functions, and types) have value specifications
that are multiple lines long. Prior to this change, doc would print out all of the
lines necessary to display the value. This is inconsistent with the documented
behavior, which guarantees a one-line summary for all first-level items.
We fix this here by writing a general oneLineNode method that always returns
a one-line summary (guaranteed!) of any input node.

Packages like image/color/palette and unicode now become much
more readable since large slices are now a single line.

$ go doc image/color/palette
<<<
// Before:
var Plan9 = []color.Color{
	color.RGBA{0x00, 0x00, 0x00, 0xff},
	color.RGBA{0x00, 0x00, 0x44, 0xff},
	color.RGBA{0x00, 0x00, 0x88, 0xff},
	... // Hundreds of more lines!
}
var WebSafe = []color.Color{
	color.RGBA{0x00, 0x00, 0x00, 0xff},
	color.RGBA{0x00, 0x00, 0x33, 0xff},
	color.RGBA{0x00, 0x00, 0x66, 0xff},
	... // Hundreds of more lines!
}

// After:
var Plan9 = []color.Color{ ... }
var WebSafe = []color.Color{ ... }
>>>

In order to test this, I ran `go doc` and `go doc -u` on all of the
standard library packages and diff'd the output with and without the
change to ensure that all differences were intended.

Fixes #13072

Change-Id: Ida10b7796b7e4e174a929b55c60813a9eb7158fe
Reviewed-on: https://go-review.googlesource.com/25420
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: default avatarRob Pike <r@golang.org>
      84743c34
  3. 04 Oct, 2016 27 commits
  5. 03 Oct, 2016 4 commits
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