Fixes #5614.

R=golang-dev
CC=golang-dev
https://golang.org/cl/9953044

R=golang-dev, dsymonds, r
CC=golang-dev
https://golang.org/cl/9961043

New version of cmd/cgo from
https://golang.org/cl/9574043/
is used to regenerate these.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/9679046

Remove unnecessary ( ) around == in && clause.
Add { } around multiline if body, even though it's one statement.

Add runtime: prefix to printed errors.

R=cshapiro, iant
CC=golang-dev
https://golang.org/cl/9685047

Fixes #5566.

R=rsc
CC=gobot, golang-dev
https://golang.org/cl/9882043

benchmark                old ns/op    new ns/op    delta
BenchmarkDecodeDigits     19451173     14347829  -26.24%
BenchmarkDecodeTwain      57516800     42619978  -25.90%

benchmark                 old MB/s     new MB/s  speedup
BenchmarkDecodeDigits         2.22         3.01    1.36x
BenchmarkDecodeTwain          2.17         2.93    1.35x

R=golang-dev, dave, bradfitz, agl
CC=golang-dev
https://golang.org/cl/9915043

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/9953043

Fixes #5527

R=golang-dev, dvyukov
CC=golang-dev
https://golang.org/cl/9955043

Required for preemptive scheduler, see the comments for details.

R=golang-dev, khr, iant, khr
CC=golang-dev
https://golang.org/cl/9740051

This is part of preemptive scheduler.

R=golang-dev, cshapiro, iant
CC=golang-dev
https://golang.org/cl/9843046

This is part of preemptive scheduler.
stackguard0 is checked in split stack checks and can be set to StackPreempt.
stackguard is not set to StackPreempt (holds the original value).

R=golang-dev, daniel.morsing, iant
CC=golang-dev
https://golang.org/cl/9875043

Fixes #5468.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/9853051

R=adg
CC=golang-dev
https://golang.org/cl/9819044

Fixes #5607.

R=golang-dev, daniel.morsing, r, dsymonds
CC=golang-dev
https://golang.org/cl/9952043

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/9950043

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/9949044

It would not pass on amd64 due to alignment of pointers.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/9949043

Thanks kballard for the hint.
Fixes #4857.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/9649045

The corresponding rules have been removed for Go 1.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/9940044

Fixes #5461.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/9947043

R=golang-dev, dave, r
CC=golang-dev
https://golang.org/cl/9935043

Fixes #5599.

Thanks to minux.ma for the suggested fix.

As we now have a harness to test testing internal functions I added some coverage for testing.roundUp, as it is the main consumer of roundDown10.

R=minux.ma, kr, r
CC=golang-dev
https://golang.org/cl/9926043

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/9693044

The Bell Labs distribution now supports 21-bit runes.

R=golang-dev, akumar
CC=golang-dev
https://golang.org/cl/9249045

Fixes #5609.

R=golang-dev, remyoudompheng, r
CC=golang-dev
https://golang.org/cl/9757045

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/9941043

seems to break freebsd-386.

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/9915047

Before this change, grow work was done only
during map writes to ensure multithreaded safety.
This can lead to maps remaining in a partially
grown state for a long time, potentially forever.
This change allows grow work to happen during reads,
which will lead to grow work finishing sooner, making
the resulting map smaller and faster.

Grow work is not done in parallel.  Reads can
happen in parallel while grow work is happening.

R=golang-dev, dvyukov, khr, iant
CC=golang-dev
https://golang.org/cl/8852047

instead of regular g stack. We do this so that the g stack
we're currently running on is no longer changing.  Cuts
the root set down a bit (g0 stacks are not scanned, and
we don't need to scan gc's internal state).  Also an
enabler for copyable stacks.

R=golang-dev, cshapiro, khr, 0xe2.0x9a.0x9b, dvyukov, rsc, iant
CC=golang-dev
https://golang.org/cl/9754044

R=golang-dev, r, bradfitz
CC=golang-dev
https://golang.org/cl/8651043

An embedded trampoline is a function that exists to marshal
a receiver of type *S to a receiver of type *T when T is an
embedded field in S.

Embedded trampolines are generated by a special path through
the compiler and are not subject to the general analysis and
annotation done to functions.  Their effects must be provided
explicitly.

R=golang-dev, r, daniel.morsing, minux.ma
CC=golang-dev
https://golang.org/cl/9874043

We require $objtype in make.rc and rc needs $path for finding commands.

Also include $cputype which we may use in the future.

R=golang-dev, minux.ma, r
CC=golang-dev
https://golang.org/cl/9905043

* Add a CXXFiles field to Package, which includes .cc, .cpp and .cxx  files.
* CXXFiles are compiled using g++, which can be overridden using the CXX environment variable.
* Include .hh, .hpp and .hxx files in HFiles.
* Add support for CPPFLAGS (used for both C and C++) and CXXFLAGS (used only for C++) in cgo directive.
* Changed pkg-config cgo directive to modify CPPFLAGS rather than CFLAGS, so both C and C++ files get any flag returned by pkg-config --cflags.

Fixes #1476.

R=iant, r
CC=bradfitz, gobot, golang-dev, iant, minux.ma, remyoudompheng, seb.binet
https://golang.org/cl/8248043

As suggested by ej@evanjones.ca.

Fixes #5604.

R=r
CC=golang-dev
https://golang.org/cl/9899043

Update #5599

R=golang-dev, r, minux.ma
CC=golang-dev
https://golang.org/cl/9738052

mheap.map become a pointer, so nelem(h->map) returns 1 rather than the map size.
As the result coalescing with subsequent spans does not happen.

R=golang-dev, khr
CC=golang-dev
https://golang.org/cl/9649046

It is a caching wrapper around SysAlloc() that can allocate small chunks.
Use it for symtab allocations. Reduces number of symtab walks from 4 to 3
(reduces buildfuncs time from 10ms to 7.5ms on a large binary,
reduces initial heap size by 680K on the same binary).
Also can be used for type info allocation, itab allocation.
There are also several places in GC where we do the same thing,
they can be changed to use persistentalloc().
Also can be used in FixAlloc, because each instance of FixAlloc allocates
in 128K regions, which is too eager.
Reincarnation of committed and rolled back https://golang.org/cl/9805043
The latent bugs that it revealed are fixed:
https://golang.org/cl/9837049
https://golang.org/cl/9778048

R=golang-dev, khr
CC=golang-dev
https://golang.org/cl/9778049

Then use the limit to make sure MHeap_LookupMaybe & inlined
copies don't return a span if the pointer is beyond the limit.
Use this fact to optimize all call sites.

R=golang-dev, dvyukov
CC=golang-dev
https://golang.org/cl/9869045

R=golang-dev, khr, rsc
CC=golang-dev
https://golang.org/cl/9728045

As the code now says:

We are forced to return a float64 because the API is silly, but do
the division as integers so we can ask if AllocsPerRun()==1
instead of AllocsPerRun()<2.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/9837049