Without this CL, the system linker complains about absolute addressing
in type..eqfunc.*.
Updates #18190
Change-Id: I68db37a7f4c96b16a9c13baffc0f043a3048df6d
Reviewed-on: https://go-review.googlesource.com/59373
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Current code uses names like "x" and "s" which can conflict with user's
code easily. Use cryptographic names.
Fixes#21668
Change-Id: Ib6d3d6327aa5b92d95c71503d42e3a79d96c8e15
Reviewed-on: https://go-review.googlesource.com/59710
Reviewed-by: Ian Lance Taylor <iant@golang.org>
When given one argument, as in
go doc binary.BigEndian
doc would search for the package, but when given two, as in
go doc binary BigEndian
it would not. Fix the inconsistency.
Fixes#18697Fixes#18664
Change-Id: Ib59dc483e8d4f91e6061c77a5ec24d0a50e115f0
Reviewed-on: https://go-review.googlesource.com/59413
Reviewed-by: Aliaksandr Valialkin <valyala@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The assembler barfs on large offsets. Make sure that all the
instructions that need to have their offsets in an int32
1) check on any rule that computes offsets for such instructions
2) change their aux fields so the check builder checks it.
The assembler also silently misassembled offsets between 1<<31
and 1<<32. Add a check in the assembler to barf on those as well.
Fixes#21655
Change-Id: Iebf24bf10f9f37b3ea819ceb7d588251c0f46d7d
Reviewed-on: https://go-review.googlesource.com/59630
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This is useful when debugging the tool.
Some tweaks on logging: log the webserver address, log.Print instead
of log.Printf when possible.
Change-Id: Iaf71b6523b40dc13795511784d48eacf0f5a396a
Reviewed-on: https://go-review.googlesource.com/59570
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
All of the mapfast key types are reflexive.
Change-Id: I8595aed2a9d945cda1b5d08e2067dce0f1c0d585
Reviewed-on: https://go-review.googlesource.com/59132
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
The newly added routines are exact copies of the generic routines,
except for the function names and that growWork_fastX calls evacuate_fastX.
Actual optimization will happen in subsequent CLs.
This is intended to ease reviewing.
Change-Id: I52ef7dd40b2bdfc9cba2496544c0604e6e71cf7f
Reviewed-on: https://go-review.googlesource.com/59130
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
In TimeoutHandler, use a request whose context has been configured with
the handler's timeout
Fixes#20712
Change-Id: Ie670148f85fdad46841ff29232042309e15665ae
Reviewed-on: https://go-review.googlesource.com/46412
Run-TryBot: Tom Bergan <tombergan@google.com>
Reviewed-by: Tom Bergan <tombergan@google.com>
Just to make it clearer which regexps are positive and which
regexps are negative.
Change-Id: Ia190e89be28048fcae2491506f552afad90a5f85
Reviewed-on: https://go-review.googlesource.com/59490
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
Reviewed-by: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
We can rematerialize only ops that have SP or SB as their only argument.
There are some ADDQconst(SP) that can be rematerialized, but are spilled/filled instead,
so mark addconst as rematerializeable. This shaves ~1kb from go tool.
Change-Id: Ib4cf4fe5f2ec9d3d7e5f0f77f1193eba66ca2f08
Reviewed-on: https://go-review.googlesource.com/54393
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
When running multiple iOS builds on the same host, GOIOS_DEVICE_ID
is used to distinguish the devices. To improve support,
- Only restart the particular device when invoking iostest.bash
with the -restart flag.
- Make the exec wrapper lock file per-device.
For the iOS builder.
Change-Id: Id6f222981f25036399a43c3202a393dba89d87cb
Reviewed-on: https://go-review.googlesource.com/57970
Run-TryBot: Elias Naur <elias.naur@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The SSA compiler currently generates MOVOstore instructions
to optimize 16 bytes moves on AMD64 architecture.
However, we can't use the MOVOstore instruction on Plan 9,
because floating point operations are not allowed in the
note handler.
We rely on the useSSE flag to disable the use of the
MOVOstore instruction on Plan 9 and replace it by two
MOVQstore instructions.
Fixes#21625
Change-Id: Idfefcceadccafe1752b059b5fe113ce566c0e71c
Reviewed-on: https://go-review.googlesource.com/59171
Run-TryBot: David du Colombier <0intro@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ilya Tocar <ilya.tocar@intel.com>
Current documentation lacks simple examples for functions Regexp.Expand
and Regexp.ExpandString whose usage is unclear from description alone.
This commit adds examples that demonstrate usage in practical way.
Fixes#21649
Change-Id: I7b2c06c8ab747f69a6578f0595bf0f3c742ac479
Reviewed-on: https://go-review.googlesource.com/59470
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Most of these are return values that were part of a receiving parameter,
so they're still accessible.
A few others are not, but those have never had a use.
Found with github.com/mvdan/unparam, after Kevin Burke's suggestion that
the tool should also warn about unused result parameters.
Change-Id: Id8b5ed89912a99db22027703a88bd94d0b292b8b
Reviewed-on: https://go-review.googlesource.com/55910
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
* use bool instead of int if it's adequate.
* remove blank lines.
Change-Id: Ic4a5644a33ed9fc7ce388ef8ba15f1732446fcfc
Reviewed-on: https://go-review.googlesource.com/59375
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The PKCS #1 v2.2 document has been moved to an EMC
website with a new URL. This CL updates the reference to the document to
the new URL.
The new URL is referenced under https://en.wikipedia.org/wiki/PKCS_1Fixes#21642
Change-Id: Ib8738b0c4c3bb9ec427bebea20c4aacd607ba0db
Reviewed-on: https://go-review.googlesource.com/59351
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This has been supported since Go 1 and there's even a test for it.
The documentation was missing.
Fixes#21409.
Change-Id: I5813488f6a98c1b4506c239e968d43344b91be12
Reviewed-on: https://go-review.googlesource.com/59412
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The IsMetaPackage function was made exported when it was moved from
cmd/go to cmd/go/internal/load in CL 36196. Its documentation wasn't
updated accordingly. This change fixes that, resolving a golint issue.
Updates #18653.
Change-Id: Icf89461000754d0f09e6617b11c838e4c050d5a6
Reviewed-on: https://go-review.googlesource.com/59430
Reviewed-by: Dave Cheney <dave@cheney.net>
One example of a heavily-used zero-size value is encoding/binary.BigEndian.
Change-Id: I8e873c447e154ab2ca61b7315df774693891270c
Reviewed-on: https://go-review.googlesource.com/59330
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Went mainly for the ones that make no sense, such as the ones
mid-sentence or after commas.
Change-Id: Ie245d2c19cc7428a06295635cf6a9482ade25ff0
Reviewed-on: https://go-review.googlesource.com/57293
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Many aspects of the package is woefully undocumented.
With the recent flurry of improvements, the package is now at feature
parity with the GNU and TAR tools. Thoroughly all of the public API
and perform some minor stylistic cleanup in some code segments.
Change-Id: Ic892fd72c587f30dfe91d1b25b88c9c8048cc389
Reviewed-on: https://go-review.googlesource.com/59210
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The PAX specification says the following:
<<<
'g' represents global extended header records for the following files in the archive.
The format of these extended header records shall be as described in pax Extended Header.
Each value shall affect all subsequent files that do not override that value
in their own extended header record and until another global extended header record
is reached that provides another value for the same field.
>>>
This CL adds support for parsing and composing global PAX records,
but intentionally does not provide support for automatically
persisting the global state across files.
Changes made:
* When Reader encounters a TypeXGlobalRecord header, it parses the
PAX records and returns them to the user ad-verbatim. Reader does not
store them in its state, ensuring it has no effect on future Next calls.
* When Writer receives a TypeXGlobalRecord header, it writes the
PAX records to the archive ad-verbatim. It does not store them in
its state, ensuring it has no effect on future WriteHeader calls.
* The restriction regarding empty record values is lifted since this
value is used to represent deletion in global headers.
Why provide raw support only:
* Some archives in the wild have a global header section (often empty)
and it is the user's responsibility to manually read and discard it's body.
The logic added here allows users to more easily skip over these sections.
* For users that do care about global headers, having access to the raw
records allows them to implement the functionality of global headers themselves
and manually persist the global state across files.
* We can still upgrade to a full implementation in the future.
Why we don't provide full support:
* Even though the PAX specification describes their operation in detail,
both the GNU and BSD tar tools (which are the most common implementations)
do not have a consistent interpretation of many details.
* Global headers were a controversial feature in PAX, by admission of the
specification itself:
<<<
The concept of a global extended header (typeflag g) was controversial.
The typeflag g global headers should not be used with interchange media that
could suffer partial data loss in transporting the archive.
>>>
* Having state persist from entry-to-entry complicates the implementation
for a feature that is not widely used and not well supported.
Change-Id: I1d904cacc2623ddcaa91525a5470b7dbe226c7e8
Reviewed-on: https://go-review.googlesource.com/59190
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
Otherwise, if there are any parallel tests, it will hang and panic with
"all goroutines are asleep - deadlock!".
Do not use flag.Uint to handle the error for us because we also want to
error on N==0, and because it would make setting the default to
GOMAXPROCS(0) more difficult, since it's an int.
Check for it right after flag.Parse, and mimic flag errors by printing
the usage and returning exit code 2.
Fixes#20542.
Change-Id: I0c9d4587f83d406a8f5e42ed74e40be46d639ffb
Reviewed-on: https://go-review.googlesource.com/54150
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This addresses the case of a -timeout panic, but not the more
general case of a signal arriving. See CL 48370 and CL 44352
for recent difficulties in that area.
"-timeout" here means flag usage to distinguish from the
default timeout termination which uses signals.
Fixes#19394
Change-Id: I5452d5422c0c080e940cbcc8c6606049975268c6
Reviewed-on: https://go-review.googlesource.com/48491
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This CL adds the following new publicly visible API:
type Header struct { ...; PAXRecords map[string]string }
The new Header.PAXRecords field is a map of all PAX extended header records.
We suggest (but do not enforce) that users use VENDOR-prefixed keys
according to the following in the PAX specification:
<<<
The standard developers have reserved keyword name space for vendor extensions.
It is suggested that the format to be used is:
VENDOR.keyword
where VENDOR is the name of the vendor or organization in all uppercase letters.
>>>
When reading, the Header.PAXRecords is populated with all PAX records
encountered so far, including basic ones (e.g., "path", "mtime", etc).
When writing, the fields of Header will be merged into PAXRecords,
overwriting any records that may conflict.
Since PAXRecords is a more expressive feature than Xattrs and
is entirely a superset of Xattrs, we mark Xattrs as deprecated,
and steer users towards the new PAXRecords API.
The issue has a discussion about adding a Header.SetPAXRecord method
to help validate records and keep the Header fields in sync.
However, we do not include that in this CL since that helper
method can always be added in the future.
There is no support for global records.
Fixes#14472
Change-Id: If285a52749acc733476cf75a2c7ad15bc1542071
Reviewed-on: https://go-review.googlesource.com/58390
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Add this early in the cycle so that we can start regression testing
of the master toolchain.
Change-Id: Ida3ccad6e9642648f489babd12877fc8a5eca07a
Reviewed-on: https://go-review.googlesource.com/59151
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
If Less(a, b) returns true when a is less than b, the correct way to
check if a is greater than b is to use Less(b, a). It is wrong to use
!Less(a, b) because that checks if a is greater than *or equal to* b.
1. The decreasingDistance function in Example_sortKeys makes this
mistake. Fix it.
2. The documentation of multiSorter.Less says it loops along the less
functions until it finds a comparison "that is either Less or
!Less". This is nonsense, because (Less(a, b) or !Less(a, b)) is
always true. Fix the documentation to say that it finds a
comparison "that discriminates between the two items (one is less
than the other)". The implementation already does this correctly.
Change-Id: If52b79f68e4fdb0d1095edf29bdecdf154a61b8d
Reviewed-on: https://go-review.googlesource.com/57752
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The current code treats the type of SIMD&FP register as C_REG incorrectly.
The fix code converts C_REG type into C_FREG type.
Uncomment fcsels/fcseld test cases.
Fixes#21582
Change-Id: I754c51f72a0418bd352cbc0f7740f14cc599c72d
Reviewed-on: https://go-review.googlesource.com/58350
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Fix two small but serious bugs in the DWARF location list code that
should have been caught by the automated tests I didn't write.
After emitting debug information for a user variable, mark it as done
so that it doesn't get emitted again. Otherwise it would be written once
per slot it was decomposed into.
Correct a merge error in CL 44350: the location list abbreviations need
to have DW_AT_decl_line too, otherwise the resulting DWARF is gibberish.
Change-Id: I6ab4b8b32b7870981dac80eadf0ebfc4015ccb01
Reviewed-on: https://go-review.googlesource.com/59070
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Change-Id: Ic3ce2f3c055f2636ec8fc9cec8592e596b18dc05
Reviewed-on: https://go-review.googlesource.com/54771
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Sometimes (often for calls) we generate code like this:
MOVQ (addr),AX
MOVQ 8(addr),BX
MOVQ AX,(otheraddr)
MOVQ BX,8(otheraddr)
Replace it with
MOVUPS (addr),X0
MOVUPS X0,(otheraddr)
For completeness do the same for 8,16,32-bit loads/stores too.
Shaves 1% from code sections of go tool.
/localdisk/itocar/golang/bin/go 10293917
go_old 10334877 [40960 bytes]
read-only data = 682 bytes (0.040769%)
global text (code) = 38961 bytes (1.036503%)
Total difference 39643 bytes (0.674628%)
Updates #6853
Change-Id: I1f0d2f60273a63a079b58927cd1c4e3429d2e7ae
Reviewed-on: https://go-review.googlesource.com/57130
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Prior to this change, we use typedmemmove to write the key
value to its new location in mapassign_fast32 and mapassign_fast64.
(The use of typedmemmove was a last-minute fix in the 1.9 cycle;
see #21297 and CL 53414.)
This is significantly less inefficient than direct assignment or
calling writebarrierptr directly.
Fortunately, there aren't many cases to consider.
On systems with 32 bit pointers:
* A 32 bit AMEM value either is a single pointer or has no pointers.
* A 64 bit AMEM value may contain a pointer at the beginning,
a pointer at 32 bits, or two pointers.
On systems with 64 bit pointers:
* A 32 bit AMEM value contains no pointers.
* A 64 bit AMEM value either is a single pointer or has no pointers.
All combinations except the 32 bit pointers / 64 bit AMEM value are
cheap and easy to handle, and the problematic case is likely rare.
The most popular map keys appear to be ints and pointers.
So we handle them exhaustively. The sys.PtrSize checks are constant branches
and are eliminated by the compiler.
An alternative fix would be to return a pointer to the key,
and have the calling code do the assignment, at which point the compiler
would have full type information.
Initial tests suggest that the performance difference between these
strategies is negligible, and this fix is considerably simpler,
and has much less impact on binary size.
Fixes#21321
Change-Id: Ib03200e89e2324dd3c76d041131447df66f22bfe
Reviewed-on: https://go-review.googlesource.com/59110
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Implement int reg <-> fp reg moves on amd64.
If we see a load to int reg followed by an int->fp move, then we can just
load to the fp reg instead. Same for stores.
math.Abs is now:
MOVQ "".x+8(SP), AX
SHLQ $1, AX
SHRQ $1, AX
MOVQ AX, "".~r1+16(SP)
math.Copysign is now:
MOVQ "".x+8(SP), AX
SHLQ $1, AX
SHRQ $1, AX
MOVQ "".y+16(SP), CX
SHRQ $63, CX
SHLQ $63, CX
ORQ CX, AX
MOVQ AX, "".~r2+24(SP)
math.Float64bits is now:
MOVSD "".x+8(SP), X0
MOVSD X0, "".~r1+16(SP)
(it would be nicer to use a non-SSE reg for this, nothing is perfect)
And due to the fix for #21440, the inlined version of these improve as well.
name old time/op new time/op delta
Abs 1.38ns ± 5% 0.89ns ±10% -35.54% (p=0.000 n=10+10)
Copysign 1.56ns ± 7% 1.35ns ± 6% -13.77% (p=0.000 n=9+10)
Fixes#13095
Change-Id: Ibd7f2792412a6668608780b0688a77062e1f1499
Reviewed-on: https://go-review.googlesource.com/58732
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ilya Tocar <ilya.tocar@intel.com>
Make it dead simple to see visually what the function outputs in
various scenarios.
Change-Id: I8f6fcd72fa1515361481f0510412cde221e1d4e3
Reviewed-on: https://go-review.googlesource.com/51630
Run-TryBot: Kevin Burke <kev@inburke.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Hiroshi Ioka <hirochachacha@gmail.com>
CL 36428 changed the way nanotime works so on Darwin and Windows it
now depends on runtime.startNano, which is computed at runtime.init
time. Unfortunately, the `runtimeInitTime = nanotime()` initialization
happened *before* runtime.init, so on these platforms runtimeInitTime
is set incorrectly. The one (and only) consequence of this is that the
start time printed in gctrace lines is bogus:
gc 1 18446653480.186s 0%: 0.092+0.47+0.038 ms clock, 0.37+0.15/0.81/1.8+0.15 ms cpu, 4->4->1 MB, 5 MB goal, 8 P
To fix this, this commit moves the runtimeInitTime initialization to
shortly after runtime.init, at which point nanotime is safe to use.
This also requires changing the condition in newproc1 that currently
uses runtimeInitTime != 0 simply to detect whether or not the main M
has started. Since runtimeInitTime could genuinely be 0 now, this
introduces a separate flag to newproc1.
Fixes#21554.
Change-Id: Id874a4b912d3fa3d22f58d01b31ffb3548266d3b
Reviewed-on: https://go-review.googlesource.com/58690
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Generated with
github.com/catapult/tracing/bin/vulcanize_trace_viewer
catapult @ ab4d571fa
Renamed trace_viewer_lean.html to trace_viewer_full.html
to make it clear we are using the full version of trace viewer
(waiting for https://github.com/catapult-project/catapult/issues/2247
to be fixed).
Update #15302
Change-Id: Ice808bb27ab79a1dec9fc863e0c5a761027ebfbe
Reviewed-on: https://go-review.googlesource.com/58750
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Since golang.org/cl/31670, we've stopped using the 'embedded' function
for handling struct embeddings within package export data. Now the
only remaining use is for Go source files, which allows for some
substantial simplifications:
1. CenterDot never appears within Go source files, so that logic can
simply be removed.
2. The field name will always be declared in the local package.
Passes toolstash-check.
Change-Id: I59505f62824206dd5de0782918f98fbef6e93224
Reviewed-on: https://go-review.googlesource.com/58790
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Discovered while debugging CL 53644.
No test case because these are purely internal conversions that should
never end up resulting in compiler warnings or even generated code.
Updates #19683.
Change-Id: I0d9333ef2c963fa22eb9b5335bb022bcc9b25708
Reviewed-on: https://go-review.googlesource.com/58190
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
When we remove a nil check, add it back to the free Value pool immediately.
Fixes#18732
Change-Id: I8d644faabbfb52157d3f2d071150ff0342ac28dc
Reviewed-on: https://go-review.googlesource.com/58810
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
There are some major problems with TestAdversary (based on "A Killer
Adversary for Quicksort"[1] by M. D. McIlroy). See #21581 for details.
Rewrite the test to closely match the version in the paper so it can
be verified as correct by virtue of similarity.
The only major difference between this new version and the version in
the paper is that this version swaps the values directly instead of
permuting an array of indices because we don't need to recover the
original permutation.
This new version also counts the number of calls to Less() and fails
the test if there are too many.
Fixes#21581.
[1]: http://www.cs.dartmouth.edu/~doug/mdmspe.pdf
Change-Id: Ia94b5b6d288b8fa3805a5fa27661cebbc5bad9a7
Reviewed-on: https://go-review.googlesource.com/58330
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The tests were removed in https://golang.org/cl/2311 but some
references to them were missed.
Change-Id: I163e554a0cc99401a012deead8fda813ad74dbfe
Reviewed-on: https://go-review.googlesource.com/58870
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
CL 54410 and CL 56250 recently added use of the MOVOstore
instruction to improve performance.
However, we can't use the MOVOstore instruction on Plan 9,
because floating point operations are not allowed in the
note handler.
This change adds a configuration flag useSSE to enable the
use of SSE instructions for non-floating point operations.
This flag is enabled by default and disabled on Plan 9.
When this flag is disabled, the MOVOstore instruction is
not used and the MOVQstoreconst instruction is used instead.
Fixes#21599
Change-Id: Ie609e5d9b82ec0092ae874bab4ce01caa5bc8fb8
Reviewed-on: https://go-review.googlesource.com/58850
Reviewed-by: Keith Randall <khr@golang.org>
This change also added the same check in make.bash to make.rc,
which makes sure $GOROOT_BOOTSTRAP != $GOROOT.
Fixes#14339
Change-Id: I2758f4a845bae42ace02492fc6a911f6d6247d26
Reviewed-on: https://go-review.googlesource.com/57753
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
WriteHeader may fail to encode a header for any number of reasons,
which can be frustrating for the user when trying to create a tar archive.
As we validate the Header, we generate an informative error message
intended for human consumption and return that if and only if no
format can be selected.
This allows WriteHeader to return informative errors like:
tar: cannot encode header: invalid PAX record: "linkpath = \x00hello"
tar: cannot encode header: invalid PAX record: "SCHILY.xattr.foo=bar = baz"
tar: cannot encode header: Format specifies GNU; and only PAX supports Xattrs
tar: cannot encode header: Format specifies GNU; and GNU cannot encode ModTime=1969-12-31 15:59:59.0000005 -0800 PST
tar: cannot encode header: Format specifies GNU; and GNU supports sparse files only with TypeGNUSparse
tar: cannot encode header: Format specifies USTAR; and USTAR cannot encode ModTime=292277026596-12-04 07:30:07 -0800 PST
tar: cannot encode header: Format specifies USTAR; and USTAR does not support sparse files
tar: cannot encode header: Format specifies PAX; and only GNU supports TypeGNUSparse
Updates #18710
Change-Id: I82a498d6f29d02c4e73bce47b768eb578da8499c
Reviewed-on: https://go-review.googlesource.com/58310
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
For code like the following (where x escapes):
x := []int{1}
We're currently generating a nil check. The line above is really 3 operations:
t := new([1]int)
t[0] = 1
x := t[:]
We remove the nil check for t[0] = 1, but not for t[:].
Our current nil check removal rule is too strict about the possible
memory arguments of the nil check. Unlike zeroing or storing to the
result of runtime.newobject, the nilness of runtime.newobject is
always false, even after other stores have happened in the meantime.
Change-Id: I95fad4e3a59c27effdb37c43ea215e18f30b1e5f
Reviewed-on: https://go-review.googlesource.com/58711
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
In writelines the linker uses various auxiliary information about a
function to create its line table entries. (It also does some unrelated
stuff, but never mind.) There's no reason to do this for non-Go
functions, so it bails out if the symbol has no FuncInfo.
However, it does so *after* it looks up (and implicitly creates!) the
go.info symbol for the function, which doesn't make sense and risks
creating duplicate symbols for static C functions. Move the check up so
that it doesn't do that.
Since non-Go functions can't reference Go types, there shouldn't be any
relocations to type info DIEs that need to be built, so there should be
no harm not doing that.
I wanted to change the Lookup to an ROLookup but that broke the
shared-mode tests with an inscrutable error.
No test. It seems too specific to worry about, but if someone disagrees
I can figure something out.
Fixes#21566
Change-Id: I61f03b7c504a3bf1c4245a8811795b6303469e91
Reviewed-on: https://go-review.googlesource.com/58630
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This eliminates a nil check of b while evaluating b.tophash,
which is in the inner loop of many hot map functions.
It also makes the code a bit clearer.
Also remove some gotos in favor of labeled breaks.
On non-x86 architectures, this change introduces a pointless reg-reg move,
although the cause is well-understood (#21572).
Change-Id: Ib7ee58b59ea5463b92e1590c8b8f5c0ef87d410a
Reviewed-on: https://go-review.googlesource.com/58372
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Otherwise the default computation in symalign kicked in, setting the
alignment to be too high. This didn't matter with GNU ld, which put
each loadable note into a separate PT_NOTE segment, but it did matter
with gold which accumulated them all into a single PT_NOTE segment,
respecting the requested alignment. In the single PT_NOTE segment
generated by gold, the incorrect section alignment made the notes
unreadable.
Fixes#21564
Change-Id: I15eb408bb04a2566c9fdfb6828e14188d9ef2280
Reviewed-on: https://go-review.googlesource.com/58290
Reviewed-by: Russ Cox <rsc@golang.org>
This is a crude compiler pass to eliminate stores to auto variables
that are only ever written to.
Eliminates an unnecessary store to x from the following code:
func f() int {
var x := 1
return *(&x)
}
Fixes#19765.
Change-Id: If2c63a8ae67b8c590b6e0cc98a9610939a3eeffa
Reviewed-on: https://go-review.googlesource.com/38746
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This prevents unnecessary reg-reg moves during pointer arithmetic.
This change reduces the size of the full hello world binary by 0.4%.
Updates #21572
Change-Id: Ia0427021e5c94545a0dbd83a6801815806e5b12d
Reviewed-on: https://go-review.googlesource.com/58371
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
On 386 the below code triggered an infinite loop in growslice:
x = make([]byte, 1<<30-1, 1<<30-1)
x = append(x, x...)
Check for overflow when calculating the new slice capacity
and set the new capacity to the requested capacity when an overflow
is detected to avoid an infinite loop.
No automatic test added due to requiring to allocate 1GB of memory
on a 32bit plaform before use of append is able to trigger the
overflow check.
Fixes#21441
Change-Id: Ia871cc9f88479dacf2c7044531b233f83d2fcedf
Reviewed-on: https://go-review.googlesource.com/57950
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Marvin Stenger <marvin.stenger94@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Currently all package tests are executed once
with Parallel tests executed in parallel.
Then this process is repeated count*cpu times.
Tests are not parallelized over count*cpu.
Parallelizing over cpu is not possible as
GOMAXPROCS is a global setting. But it is
possible for count.
Parallelize over count.
Brings down testing of my package with -count=100
form 10s to 0.3s.
Change-Id: I76d8322adeb8c5c6e70b99af690291fd69d6402a
Reviewed-on: https://go-review.googlesource.com/44830
Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This slightly improves the generated code on x86 architectures,
including on many hot paths.
It is a no-op on other architectures.
Change-Id: I86336fd846bc5805a27bbec572e8c73dcbd0d567
Reviewed-on: https://go-review.googlesource.com/57411
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This is necessary when you aren't actively changing the runtime. Oops.
Also, run the tests on the builders, to avoid silent failures (#17472).
Change-Id: I1fc03790cdbddddb07026a772137a79919dcaac7
Reviewed-on: https://go-review.googlesource.com/58050
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The Reader and Writer are now at feature parity,
meaning that everything that can be parsed by the Reader,
can also be composed by the Writer.
This position enables us to support selection of the format
in a backwards compatible way, since it ensures that everything
that can be read can also be round-trip written.
As such, we add the following new API:
type Format int
const FormatUnknown Format = 0 ...
type Header struct { ...; Format Format }
The new Header.Format field is populated by the Reader on the
best guess on what the format is. Note that the Reader is very liberal
in what it permits, so a hybrid TAR file using aspects of multiple
formats can still be decoded, but will be reported as FormatUnknown.
Even though Reader has full support for V7 and basic support for STAR,
it will still report those formats as unknown (and the constants for
those formats are not even exported). The reasons for this is because
the Writer has no support for V7 or STAR. Leaving it as unknown allows
the Writer to choose a format usually USTAR or GNU that can encode
the equivalent Header.
When writing, the Header.allowedFormats will take the Format field
into consideration if it is a known format.
Fixes#18710
Change-Id: I00980c475d067c6969d3414e1ff0224fdd89cd49
Reviewed-on: https://go-review.googlesource.com/58230
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The method Method expects index to be an index of exported fields,
but, before this change, the index used by MethodByName could
take into account unexported fields if those happened sort
before the exported one.
Fixes#21177
Change-Id: I90bb64a47b23e2e43fdd2b8a1e0a2c9a8a63ded2
Reviewed-on: https://go-review.googlesource.com/51810
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This CL is the second step (of two; part1 is CL/56771) for adding
sparse file support to the Writer.
There are no new identifiers exported in this CL, but this does make
use of Header.SparseHoles added in part1. If the Typeflag is set to
TypeGNUSparse or len(SparseHoles) > 0, then the Writer will emit an
sparse file, where the holes must be written by the user as zeros.
If TypeGNUSparse is set, then the output file must use the GNU format.
Otherwise, it must use the PAX format (with GNU-defined PAX keys).
A future CL may export Reader.Discard and Writer.FillZeros,
but those methods are currently unexported, and only used by the
tests for efficiency reasons.
Calling Discard or FillZeros on a hole 10GiB in size does take
time, even if it is essentially a memcopy.
Updates #13548
Change-Id: Id586d9178c227c0577f796f731ae2cbb72355601
Reviewed-on: https://go-review.googlesource.com/57212
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run "cmd/go terminal test" after standard library tests.
Run "testing race detector" before cgo tests, not in the middle of them.
Fixes#21524
Change-Id: I32964ec6377dd070242138ec452bd8ab1821dcc5
Reviewed-on: https://go-review.googlesource.com/57230
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Reviewed-by: Joe Tsai <joetsai@google.com>
For those tests there won't be enough permissions in containers.
I decided to go this way instead of just skipping os.IsPermission errors because
many of those tests were specifically written to check false positive permission
errors.
Fixes#21379
Change-Id: Ie25e1d6d47f85bb6b570352638440f3ac1e18e03
Reviewed-on: https://go-review.googlesource.com/58170
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
The current code treats floating-point constant as integer
and does not treat fcmp/fcmpe as the comparison instrucitons
that requires special handling.
The fix corrects the type of immediate arguments and adds fcmp/fcmpe
in the special handing.
Uncomment the fcmp/fcmpe cases.
Fixes#21567
Change-Id: I6782520e2770f6ce70270b667dd5e68f71e2d5ad
Reviewed-on: https://go-review.googlesource.com/57852
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This will prevent any ptrace calls from getting trace output from the runtime
itself setting up after fork.
Fixes#21428.
Change-Id: I9d835bd5a8f404394eb6237679f2111a72e5bc17
Reviewed-on: https://go-review.googlesource.com/55811
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Avelino <t@avelino.xxx>
When deleting entries from a map, only clear the key and value
if they contain pointers. And use memclrHasPointers to do so.
While we're here, specialize key clearing in mapdelete_faststr,
and fix another missed usage of add in mapdelete.
Benchmarking impeded by #21546.
Change-Id: I3f6f924f738d6b899b722d6438e9e63f52359b84
Reviewed-on: https://go-review.googlesource.com/57630
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Move the tophash checks after the equality/length checks.
For fast32/fast64, since we've done a full equality check already,
just check whether tophash is empty instead of checking tophash.
This is cheaper and allows us to skip calculating tophash.
These changes are modeled on the changes in CL 57590,
which were polished based on benchmarking.
Benchmarking directly is impeded by #21546.
Change-Id: I0e17163028e34720310d1bf8f95c5ef42d223e00
Reviewed-on: https://go-review.googlesource.com/57611
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This better matches the style of the rest of the runtime.
Change-Id: I6abb755df50eb3d9086678629c0d184177e1981f
Reviewed-on: https://go-review.googlesource.com/57610
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
During rebase of golang.org/cl/55152 the bucket argument
which was removed in golang.org/cl/56290 from makemap
was not removed from the argument list of makemap64.
This did lead to "pointer in unallocated span" errors
on 32bit platforms since the compiler did only generate
calls to makemap64 without the bucket argument.
Fixes#21568
Change-Id: Ia964a3c285837cd901297f4e16e40402148f8c1c
Reviewed-on: https://go-review.googlesource.com/57990
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Alex Brainman
Hiroshi Ioka
Kunpei Sakai
Matthew Dempsky
Josh Bleecher Snyder
Rob Pike
Keith Randall
Hana Kim
Martin Möhrmann
Michael Fraenkel
Ilya Tocar
Karsten Köhler
Elias Naur
David du Colombier
Artyom Pervukhin
Ben Shi
Matej Baćo
Wei Xiao
Daniel Martí
Ulrich Kunitz
Dmitri Shuralyov
Joe Tsai
Meir Fischer
Ian Lance Taylor
Borja Clemente
Tom Levy
fanzha02
Heschi Kreinick
jaredculp
Kevin Burke
Austin Clements
Danny Rosseau
Aliaksandr Valialkin
Wei Congrui
Francesc Campoy Flores
Michael Munday
Dmitry Vyukov
Karel Pazdera
André Carvalho
Alexander Morozov
Jess Frazelle