Update #4956.

R=golang-dev
CC=golang-dev
https://golang.org/cl/7417048

Putting the M initialization in multiple places will not scale.
Various code assumes mstart is the start already. Make it so.

R=golang-dev, devon.odell
CC=golang-dev
https://golang.org/cl/7420048

Move the mstartfn into its own field.
Simpler, more likely to be correct.

R=golang-dev, devon.odell
CC=golang-dev
https://golang.org/cl/7414046

R=devon.odell
CC=golang-dev
https://golang.org/cl/7443046

Fixes #4948.

R=golang-dev, alex.brainman
CC=golang-dev
https://golang.org/cl/7445045

This time for sure.

R=golang-dev
CC=golang-dev
https://golang.org/cl/7449045

Distribute runnable queues, memory cache
and cache of dead G's per processor.
Faster non-blocking syscall enter/exit.
More conservative worker thread blocking/unblocking.

R=dave, bradfitz, remyoudompheng, rsc
CC=golang-dev
https://golang.org/cl/7314062

There is a #pragma dynexport crosscall2, to help SWIG,
and 6l cannot export the symbol if it doesn't get to see it.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7448044

During my global search and replace I forgot to open *.S (capital).

R=golang-dev
TBR=golang-dev
CC=golang-dev
https://golang.org/cl/7415047

Switch to new pragma names, but leave old ones available for now.
Merge the three cgo-related sections in the .6 files into a single
cgo section.

R=golang-dev, iant, ality
CC=golang-dev
https://golang.org/cl/7424048

R=golang-dev, rsc
CC=golang-dev, minux.ma
https://golang.org/cl/7424047

Fixes #4950.

R=golang-dev, peter
CC=golang-dev
https://golang.org/cl/7415046

Fixes #4930.

R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7424043

- implement windows pread;
- set correct Fhdr.type;
- add ImageBase to all pe "virtual" addresses;
- correct settext parameter order;
- use pclntab/epclntab to find line numbers.

Fixes #4841.
Fixes #4926.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7405050

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/7439048

Now that untyped expressions are done in two phases, the
identity of operand.expr is used as a map key; when reusing
operand values we now must be careful to update the
expr field.

R=gri
CC=golang-dev
https://golang.org/cl/7444049

Fixes #4767

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/7435046

R=golang-dev, nigeltao, adg
CC=golang-dev
https://golang.org/cl/7444048

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/7454044

R=r
CC=golang-dev
https://golang.org/cl/7442045

net/http/cookiejar.

This is a straight rename. There are no code changes.

Fixes #1960.

R=rsc, adg
CC=dr.volker.dobler, golang-dev
https://golang.org/cl/7436043

Fixes #4942.

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/7444047

Completely rethought shift expression type checking.
Instead of attempting to type-check them eagerly, now
delay the checking of untyped constant lhs in non-
constant shifts until the final expression type
becomes clear. Once it is clear, update the respective
expression tree with the final (not untyped) type and
check respective shift lhs' where necessary.

This also cleans up another conundrum: How to report
the type of untyped constants as it changes from
untyped to typed. Now, Context.Expr is only called
for an expresion x once x has received its final
(not untyped) type (for constant initializers, the
final type may still be untyped).

With this CL all remaining std lib packages that
did not typecheck due to shift errors pass now.

TODO: There's a lot of residual stuff that needs
to be cleaned up but with this CL all tests pass
now.

R=adonovan, axwalk
CC=golang-dev
https://golang.org/cl/7381052

And add a benchmark where #goroutines>GOMAXPROCS,
because it's the most interesting case.
Current results on darwin/amd64, Intel Core 2 Duo 2.13 GHz, 2 cores:
BenchmarkSyscall	100000000	        56.0 ns/op
BenchmarkSyscall-2	50000000	        57.2 ns/op
BenchmarkSyscallWork	10000000	       635 ns/op
BenchmarkSyscallWork-2	10000000	       315 ns/op
BenchmarkSyscallExcess	 1000000	      2698 ns/op
BenchmarkSyscallExcess-2	 5000000	      1192 ns/op
BenchmarkSyscallExcessWork	 1000000	      2832 ns/op
BenchmarkSyscallExcessWork-2	 2000000	      1966 ns/op

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/7415044

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/7431047

The Name field of the stat structure is variable length
and the marshalling code in package syscall requires
a buf long enough to contain the Name as well as the
static data. This change makes sure that the buffer in
os.Rename is allocated with the appropriate length.

R=rsc, rminnich, ality, r
CC=golang-dev
https://golang.org/cl/7453044

There are some function pointers declared by 6c in
package runtime without initialization and then also
declared in package runtime/cgo with initialization,
so that if runtime/cgo is linked in, the function pointers
are non-nil, and otherwise they are nil. We depend on
this property for implementing non-essential cgo hooks
in package runtime.

The declarations in package runtime are 6c-compiled
and end up in .6 files. The declarations in package runtime/cgo
are gcc-compiled and end up in .o files. Since 6l links the .6
and .o files together, this all works.

However, when we switch to "external linking" mode,
6l will not see the .o files, and it would be up to the host linker
to resolve the two into a single initialized symbol.
Not all host linkers will do this (in particular OS X gcc will not).

To fix this, move the cgo declarations into 6c-compiled code,
so that they end up in .6 files, so that 6l gets them no matter what.

R=golang-dev
CC=golang-dev
https://golang.org/cl/7440045

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7439046

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7423046

The naming in this package is a disaster.
Make it all consistent.

Remove some 'static' from functions that will
be referred to from other files soon.

This CL is purely renames using global search and replace.

Submitting separately so that real changes will not
be drowned out by these renames in future CLs.

TBR=iant
CC=golang-dev
https://golang.org/cl/7416046

runtime: double-check that symbol table is sorted

If the symbol table is unsorted, the binary search in findfunc
will not find its func, which will make stack traces stop early.
When the garbage collector starts using the stack tracer,
that would be a serious problem.

The unsorted symbol addresses came from from two things:

1. The symbols in an ELF object are not necessarily sorted,
   so sort them before adding them to the symbol list.

2. The __i686.get_pc_thunk.bx symbol is present in multiple
   object files and was having its address adjusted multiple
   times, producing an incorrect address in the symbol table.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7440044

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7413045

Also add a report about "invalid type" from gotype, if -v is set.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7420045

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/7431046

This is the plan for how to make host linking work with
the rest of the system.

There are two complications:

1. It is a goal to preserve the property that pure Go programs
(even ones importing "net") can be compiled without needing
gcc, so that a Go toolchain download works out of the box.
This forces the support for two linking modes: with and without
gcc.

2. It is a goal to allow users with old copies of SWIG to continue
to use those copies. This forces the support for "internal only"
packages. Perhaps it is reasonable to require a new SWIG.
I don't know.

R=iant
CC=golang-dev
https://golang.org/cl/7433043

This reveals the presence of control and non-printable characters in the
errors returned by the Parse functions.  Also add unit tests for NumError.

R=golang-dev, r, rsc
CC=golang-dev
https://golang.org/cl/7393075

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7444045

The test suite for ReadResponse was not checking the error return on the io.Copy
on the body. This was masking two errors: the handling of chunked responses to
HEAD requests and the handling of Content-Length > 0 to HEAD.

The former manifested itself as an 'unexpected EOF' when doing the io.Copy
because a chunked reader was assigned but there were no chunks to read. The
latter cause (*http.Response).Write to report an error on HEAD requests
because it saw a Content-Length > 0 and expected a body.

There was also a missing \r\n in one chunked test that meant that the chunked
encoding was malformed. This does not appear to have been intentional.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7407046

also move a cgo-depend test to appropriate source file in runtime.

R=golang-dev, dave, adg, rsc
CC=golang-dev
https://golang.org/cl/7393063

Fixes #4769.

R=golang-dev, dave, adg, bradfitz
CC=fullung, golang-dev
https://golang.org/cl/7322089