On linux/386 compared to tip:
name old time/op new time/op delta
DecodeInterfaceSlice-40 1.23ms ± 1% 1.17ms ± 1% -4.93% (p=0.000 n=9+10)
Recovers about half the performance regression from Go 1.6 on 386.
For #16117.
Change-Id: Ie8676d92a4da3e27ff21b91a98b3e13d16730ba1
Reviewed-on: https://go-review.googlesource.com/24468
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Do not throw away the rest of Int63 value used for
generation random bytes. Save it in Rand struct and
re-use during the next Read call.
Fixes#16124
Change-Id: Ic70bd80c3c3a6590e60ac615e8b3c2324589bea3
Reviewed-on: https://go-review.googlesource.com/24251
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This fixes some 40 warnings from go vet.
Fixes#16134.
Change-Id: Ib9fcba275fe692f027a2a07b581c8cf503b11087
Reviewed-on: https://go-review.googlesource.com/24287
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Change ExampleResponseRecorder to use httptest.NewRequest instead of
http.NewRequest. This makes the example shorter and shows how to use
one more function from the httptest package.
Change-Id: I3d35869bd0a4daf1c7551b649428bb2f2a45eba2
Reviewed-on: https://go-review.googlesource.com/24480
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The compiler was treating all global function literals as occurring in a
function named "glob", which caused a symbol name collision when there
was an actual function named "glob". Fixed by adding a period.
Fixes#16193.
Change-Id: I67792901a8ca04635ba41d172bfaee99944f594d
Reviewed-on: https://go-review.googlesource.com/24500
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
In the comments for this file there is a reference to gperftools
for more info on pprof. pprof now live on its own repo on github,
and the version in gperftools is deprecated.
Change-Id: I8a188f129534f73edd132ef4e5a2d566e69df7e9
Reviewed-on: https://go-review.googlesource.com/24502
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Make sure the pointer to the heap copy of an output parameter is kept
live throughout the function. The function could panic at any point,
and then a defer could recover. Thus, we need the pointer to the heap
copy always available so the post-deferreturn code can copy the return
value back to the stack.
Before this CL, the pointer to the heap copy could be considered dead in
certain situations, like code which is reverse dominated by a panic call.
Fixes#16095.
Change-Id: Ic3800423e563670e5b567b473bf4c84cddb49a4c
Reviewed-on: https://go-review.googlesource.com/24213
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This fixes the obvious bug and makes go vet look for identifiers in foo
package when checking example names in foo_test package.
Note that for this check to work the foo package have to be
installed (using go install).
This commit however doesn't fix TestDivergentPackagesExamples test that
is not implemented correctly and passes only by chance.
Updates #16189
Change-Id: I5c2f675cd07e5b66cf0432b2b3e422ab45c3dedd
Reviewed-on: https://go-review.googlesource.com/24487
Reviewed-by: Dmitri Shuralyov <shurcool@gmail.com>
Run-TryBot: Rob Pike <r@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Swtich from a sync.RWMutex to atomic.Value for cacheTypeFields.
On GOARCH=386, this recovers most of the remaining performance
difference from the 1.6 release. Compared with tip on linux/386:
name old time/op new time/op delta
CodeDecoder-40 92.8ms ± 1% 87.7ms ± 1% -5.50% (p=0.000 n=10+10)
name old speed new speed delta
CodeDecoder-40 20.9MB/s ± 1% 22.1MB/s ± 1% +5.83% (p=0.000 n=10+10)
With more time and care, I believe more of the JSON decoder's work
could be shifted so it is done before decoding, and independent of
the number of bytes processed. Maybe someone could explore that for
Go 1.8.
For #16117.
Change-Id: I049655b2e5b76384a0d5f4b90e3ec7cc8d8c4340
Reviewed-on: https://go-review.googlesource.com/24472
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Fixes#15788
Change-Id: I5a1fd1e5992f1c16cf8d8437d742bf02e1653b9c
Reviewed-on: https://go-review.googlesource.com/23461
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
If we are using a remote source (a URL), and the user did not specify
the executable file to use, then don't try to use a local source.
This was misbehaving because the local symbolizer will not fail
if there is any memory map available, but the presence of a memory map
does not ensure that the files and symbols are actually available.
We still need a pprof testsuite.
Fixes#16159.
Change-Id: I0250082a4d5181c7babc7eeec6bc95b2f3bcaec9
Reviewed-on: https://go-review.googlesource.com/24464
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Handling a symbol with address 0 and size 0, such as an ELF STT_FILE
symbols, was causing us to disassemble the entire program. We started
adding STT_FILE symbols to help fix issue #13247.
Fixes#16154.
Change-Id: I174b9614e66ddc3d65801f7c1af7650f291ac2af
Reviewed-on: https://go-review.googlesource.com/24460
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Like AMD64, don't issue NilCheck instruction if the subsequent block
has a load or store at the same address.
Pass test/nilptr3_ssa.go.
Updates #15365.
Change-Id: Ic88780dab8c4893c57d1c95f663760cc185fe51e
Reviewed-on: https://go-review.googlesource.com/24451
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
Previously, a 0 mantissa was special-cased during big.Float
parsing, but not during big.Rat parsing. This meant that a value
like 0e9999999999 would parse successfully in big.Float.SetString,
but would hang in big.Rat.SetString. This discrepancy became an
issue in https://golang.org/src/go/constant/value.go?#L250,
where the big.Float would report an exponent of 0, so
big.Rat.SetString would be used and would subsequently hang.
A Go Playground example of this is https://play.golang.org/p/3fy28eUJuF
The solution is to special-case a zero mantissa during big.Rat
parsing as well, so that neither big.Rat nor big.Float will hang when
parsing a value with 0 mantissa but a large exponent.
This was discovered using go-fuzz on CockroachDB:
https://github.com/cockroachdb/go-fuzz/blob/master/examples/parser/main.goFixes#16176
Change-Id: I775558a8682adbeba1cc9d20ba10f8ed26259c56
Reviewed-on: https://go-review.googlesource.com/24430
Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
It was out of date; in 1.7 the format changes to 0s.
Change-Id: I2013a1b0951afc5607828f313641b51c74433257
Reviewed-on: https://go-review.googlesource.com/24421
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Also replace double spaces after periods with single spaces.
Change-Id: Iedaea47595c5ce64e7e8aa3a368f36d49061c555
Reviewed-on: https://go-review.googlesource.com/24431
Reviewed-by: Alan Donovan <adonovan@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The encoding/json package uses NumMethod()==0 as a fast check for
interface satisfaction. In the case when a type has no methods at
all, we don't need to grab the RWMutex.
Improves JSON decoding benchmark on linux/amd64:
name old time/op new time/op delta
CodeDecoder-8 44.2ms ± 2% 40.6ms ± 1% -8.11% (p=0.000 n=10+10)
name old speed new speed delta
CodeDecoder-8 43.9MB/s ± 2% 47.8MB/s ± 1% +8.82% (p=0.000 n=10+10)
For #16117
Change-Id: Id717e7fcd2f41b7d51d50c26ac167af45bae3747
Reviewed-on: https://go-review.googlesource.com/24433
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
CSE may substitute a tuple generator with another one in a different
block. In this case, since we want tuple selectors to stay together
with the tuple generator, copy the selector to the new generator's
block and rewrite its use.
Op.isTupleGenerator and Op.isTupleSelector are introduced to assert
tuple ops. Use it in tighten as well.
Updates #15365.
Change-Id: Ia9e8c734b9cc3bc9fca4a2750041eef9cdfac5a5
Reviewed-on: https://go-review.googlesource.com/24137
Reviewed-by: David Chase <drchase@google.com>
This was removed in CL 19695 but it slows down reflect.New, which ends
up on the hot path of things like JSON decoding.
There is no immediate cost in binary size, but it will make it harder to
further shrink run time type information in Go 1.8.
Before
BenchmarkNew-40 30000000 36.3 ns/op
After
BenchmarkNew-40 50000000 29.5 ns/op
Fixes#16161
Updates #16117
Change-Id: If7cb7f3e745d44678f3f5cf3a5338c59847529d2
Reviewed-on: https://go-review.googlesource.com/24400
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Since at least 1.0.3, the testing package has said that logs are dumped
to standard error, but has in fact dumped the logs to standard output.
We could change to dump to standard error, but after doing it this way
for so long I think it's better to change the docs.
Fixes#16138.
Change-Id: If39c7ce91f51c7113f33ebabfb8f84fd4611b9e1
Reviewed-on: https://go-review.googlesource.com/24311
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
I tried simply increasing the size of the slice but then I got an error
because NSTATES was too small. Leaving a real fix for after 1.7.
Update #16144.
Change-Id: I8676772cb79845dd4ca1619977d4d54a2ce6de59
Reviewed-on: https://go-review.googlesource.com/24321
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
MOVB $1, (AX) was being disassembled as MOVL $1, (AX).
Use the memory size to override the standard size.
Fix the tests.
Fixes#15922
Change-Id: If92fe74c33a21e5427c8c5cc97dd15e087edb860
Reviewed-on: https://go-review.googlesource.com/23608
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Add Bill O'Farrell (corporate CLA for IBM)
Add Karan Dhiman (corporate CLA for IBM)
Add Sam Ding (corporate CLA for IBM)
Add Tristan Amini (corporate CLA for IBM)
Add Yu Heng Zhang (corporate CLA for IBM)
Add Yu Xuan Zhang (corporate CLA for IBM)
Change-Id: I9ab15e33954afc2c208fc2e420a72c5a4d865f9b
Reviewed-on: https://go-review.googlesource.com/24350
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This is a regression from 1.6. The respective code in importimport
(export.go) was not exactly replicated with the new importer. Also
copied over the missing cyclic import check.
Added test cases.
Fixes#16133.
Change-Id: I1e0a39ff1275ca62a8054874294d400ed83fb26a
Reviewed-on: https://go-review.googlesource.com/24312
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
If -s is specified, each file is considered a separate
package even if multiple files have the same package names.
For instance, the action and flag "errorcheckdir -s"
will compile all files in the respective directory as
individual packages.
Change-Id: Ic5c2f9e915a669433f66c2d3fe0ac068227a502f
Reviewed-on: https://go-review.googlesource.com/24313
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The cfg subpackage builds a control flow graph of ast.Nodes.
The lostcancel module checks this graph to find paths, from a call to
WithCancel to a return statement, on which the cancel variable is
not used. (A trivial case is simply assigning the cancel result to
the blank identifier.)
In a sample of 50,000 source files, the new check found 2068 blank
assignments and 118 return-before-cancel errors. I manually inspected
20 of the latter and didn't find a single false positive among them.
Change-Id: I84cd49445f9f8d04908b04881eb1496a96611205
Reviewed-on: https://go-review.googlesource.com/24150
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
The test is in the runtime package because there are other tests of
pprof there. At some point we should probably move them all into a pprof
testsuite.
Fixes#16128.
Change-Id: Ieefa40c61cf3edde11fe0cf04da1debfd8b3d7c0
Reviewed-on: https://go-review.googlesource.com/24274
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
A straight conversion from a type T to an interface type I, where T does
not implement I, should always panic with an interface conversion error
that shows the missing method. This was not happening if the conversion
was done once using the comma-ok form (the result would not be OK) and
then again in a straight conversion. Due to an error in the runtime
package the second conversion was failing with a nil pointer
dereference.
Fixes#16130.
Change-Id: I8b9fca0f1bb635a6181b8b76de8c2385bb7ac2d2
Reviewed-on: https://go-review.googlesource.com/24284
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Michel Lespinasse <walken@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
- Mention RFC 2616 conformation in which the server now only sends one
"Transfer-Encoding" header when "chunked" is explicitly set.
- Mention that a timeout handler now sends a 200 status code on
encountering an empty response body instead of sending back 0.
Change-Id: Id45e2867390f7e679ab40d7a66db1f7b9d92ce17
Reviewed-on: https://go-review.googlesource.com/24250
Reviewed-by: Andrew Gerrand <adg@golang.org>
pecoff.doc (https://goo.gl/ayvckk) in section 5.6 says:
Immediately following the COFF symbol table is the COFF string table.
The position of this table is found by taking the symbol table address
in the COFF header, and adding the number of symbols multiplied by
the size of a symbol.
So it is unclear what to do when symbol table address is 0.
Lets assume executable does not have any string table.
Added new test with executable with no symbol table. The
gcc -s testdata\hello.c -o testdata\gcc-386-mingw-no-symbols-exec.
command was used to generate the executable.
Fixes#16084
Change-Id: Ie74137ac64b15daadd28e1f0315f3b62d1bf2059
Reviewed-on: https://go-review.googlesource.com/24200
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Use the same technique as mips64 for these casts (CL 22835).
We could use the FCFIDU instruction for ppc64le however it seems
better to keep it the same as ppc64 for now.
Updates #15539, updates #16004.
Change-Id: I550680e485327568bf3238c4615a6cc8de6438d7
Reviewed-on: https://go-review.googlesource.com/24191
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Michael Munday <munday@ca.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
We haven't used poisonStack since we switched to 1-bit stack maps
(4d0f3a1), but the checks are still there. However, nothing prevents
us from genuinely allocating an object at this address on 32-bit and
causing the runtime to crash claiming that it's found a bad pointer.
Since we're not using poisonStack anyway, just pull it out.
Fixes#15831.
Change-Id: Ia6ef604675b8433f75045e369f5acd4644a5bb38
Reviewed-on: https://go-review.googlesource.com/24211
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
