Russ Cox [Tue, 29 Oct 2013 15:50:40 +0000 (11:50 -0400)]
os: do not return Lstat errors from Readdir
This CL restores the Go 1.1.2 semantics for os.File's Readdir method.
The code in Go 1.1.2 was rewritten mainly because it looked buggy.
This new version attempts to be clearer but still provide the 1.1.2 results.
The important diff is not this CL's version against tip but this CL's version
against Go 1.1.2.
Go 1.1.2:
names, err := f.Readdirnames(n)
fi = make([]FileInfo, len(names))
for i, filename := range names {
fip, err := Lstat(dirname + filename)
if err == nil {
fi[i] = fip
} else {
fi[i] = &fileStat{name: filename}
}
}
return fi, err
This CL:
names, err := f.Readdirnames(n)
fi = make([]FileInfo, len(names))
for i, filename := range names {
fip, lerr := lstat(dirname + filename)
if lerr != nil {
fi[i] = &fileStat{name: filename}
continue
}
fi[i] = fip
}
return fi, err
The changes from Go 1.1.2 are stylistic, not semantic:
1. Use lstat instead of Lstat, for testing (done before this CL).
2. Make error handling in loop body look more like an error case.
3. Use separate error variable name in loop body, to be clear
we are not trying to influence the final return result.
Russ Cox [Tue, 29 Oct 2013 14:36:51 +0000 (10:36 -0400)]
debug/dwarf: add DWARF 4 form constants
Some versions of clang generate DWARF 4-format attributes
even when using -gdwarf-2. We don't care much about the
values, but we do need to be able to parse past them.
This fixes a bug in Go 1.2 rc2 reported via private mail using
a near-tip version of clang.
Russ Cox [Tue, 29 Oct 2013 02:21:26 +0000 (22:21 -0400)]
cmd/cgo: stop using -fno-eliminate-unused-debug-types
This flag was added in January 2010, in CL 181102, to fix issue 497.
(Numbers were just shorter back then.) The fix was for OS X machines
and the llvm-gcc frontend.
In July 2011 we had to change the way we get enum values, because
there were no flags available to force Xcode's llvm-gcc to include the
enum names and values in DWARF debug output.
We now use clang, not llvm-gcc, on OS X machines.
Earlier versions of clang printed a warning about not knowing the flag.
Newer versions of clang now make that an error.
That is:
- The flag was added for OS X machines.
- The flag is no longer necessary on OS X machines.
- The flag now breaks some OS X machines.
Remove it.
I have run the original program from issue 497 successfully
without the flag on both OS X and Linux machines.
Russ Cox [Mon, 28 Oct 2013 23:40:40 +0000 (19:40 -0400)]
runtime: relax preemption assertion during stack split
The case can happen when starttheworld is calling acquirep
to get things moving again and acquirep gets preempted.
The stack trace is in golang.org/issue/6644.
It is difficult to build a short test case for this, but
the person who reported issue 6644 confirms that this
solves the problem.
Fixes #6644.
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/18740044
Brad Fitzpatrick [Thu, 24 Oct 2013 22:51:19 +0000 (15:51 -0700)]
strings: fix Replacer bug with prefix matches
singleStringReplacer had a bug where if a string was replaced
at the beginning and no output had yet been produced into the
temp buffer before matching ended, an invalid nil check (used
as a proxy for having matched anything) meant it always
returned its input.
Fixes #6659
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/16880043
Adam Langley [Mon, 21 Oct 2013 20:35:09 +0000 (16:35 -0400)]
crypto/tls: advertise support for RSA+SHA1 in TLS 1.2 handshake.
Despite SHA256 support being required for TLS 1.2 handshakes, some
servers are aborting handshakes that don't offer SHA1 support.
This change adds support for signing TLS 1.2 ServerKeyExchange messages
with SHA1. It does not add support for signing TLS 1.2 client
certificates with SHA1 as that would require the handshake to be
buffered.
Fixes #6618.
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/15650043
Russ Cox [Fri, 18 Oct 2013 19:56:25 +0000 (15:56 -0400)]
cmd/cgo: stop using compiler error message text to analyze C names
The old approach to determining whether "name" was a type, constant,
or expression was to compile the C program
name;
and scan the errors and warnings generated by the compiler.
This requires looking for specific substrings in the errors and warnings,
which ties the implementation to specific compiler versions.
As compilers change their errors or drop warnings, cgo breaks.
This happens slowly but it does happen.
Clang in particular (now required on OS X) has a significant churn rate.
The new approach compiles a slightly more complex program
that is either valid C or not valid C depending on what kind of
thing "name" is. It uses only the presence or absence of an error
message on a particular line, not the error text itself. The program is:
// error if and only if name is undeclared
void f1(void) { typeof(name) *x; }
// error if and only if name is not a type
void f2(void) { name *x; }
// error if and only if name is not an integer constant
void f3(void) { enum { x = (name)*1 }; }
I had not been planning to do this until Go 1.3, because it is a
non-trivial change, but it fixes a real Xcode 5 problem in Go 1.2,
and the new code is easier to understand than the old code.
It should be significantly more robust.
Dmitriy Vyukov [Fri, 18 Oct 2013 06:45:19 +0000 (10:45 +0400)]
runtime: remove nomemprof
Nomemprof seems to be unneeded now, there is no recursion.
If the recursion will be re-introduced, it will break loudly by deadlocking.
Fixes #6566.
Alberto García Hierro [Thu, 17 Oct 2013 16:02:32 +0000 (09:02 -0700)]
database/sql: make tests repeatable with -cpu=n,n
New test added in CL 14611045 causes a deadlock when
running the tests with -cpu=n,n because the fakedb
driver always waits when opening a new connection after
running TestConnectionLeak. Reset its state after.
Robert Griesemer [Wed, 16 Oct 2013 23:16:54 +0000 (16:16 -0700)]
spec: clarify re-use of underlying arrays in slice operations
Please note the slight rewording for append: The spec now
requires that append reuses the underlying array if it is
sufficiently large. Per majority sentiment.
This is technically a language change but the current
implementation always worked this way.
Alberto García Hierro [Wed, 16 Oct 2013 16:22:57 +0000 (09:22 -0700)]
database/sql: Fix connection leak and potential deadlock
CL 10726044 introduced a race condition which causes connections
to be leaked under certain circumstances. If SetMaxOpenConns is
used, the application eventually deadlocks. Otherwise, the number
of open connections just keep growing indefinitely.
Russ Cox [Tue, 15 Oct 2013 19:00:48 +0000 (15:00 -0400)]
cmd/cgo: print the builtin prolog after the per-file preamble
The preamble may want to #define some special symbols
and then #include <sys/types.h> itself. The builtin prolog
also #includes <sys/types.h>, which would break such a
preamble (because the second #include will be a no-op).
The use of sys/types.h in the builtin prolog is new since Go 1.1,
so this should preserve the semantics of more existing cgo
code than we would otherwise.
It also fixes src/pkg/syscall/mkall.sh's use of go tool cgo -godefs
on some Linux systems.
undone because the change slows down profile collection
significantly and unpredictable at times (see comments
at https://golang.org/cl/14231047 for details)
««« original CL description
runtime: collect profiles even while on g0 stack
Rob Pike [Fri, 11 Oct 2013 00:26:03 +0000 (17:26 -0700)]
doc/effective_go.html: fix a couple of cosmetic issues
At the moment, godoc expands the example in the link, but in
the past it has not. Add a waffle word to allow either possibility.
Also change the order of cases in the switch in Compare to
be consistent with the other switch in the function.
Dominik Honnef [Thu, 10 Oct 2013 23:30:47 +0000 (16:30 -0700)]
codereview: fix hg sync closing of CLs for subrepositories
The regexp for closing CLs that were sent by you but committed by
someone else only matched messages for the main repository,
because of the added &repo=... for subrepositories.
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/14512045
Instead of adding an -march=armv5t flag to the gcc command
line, the same effect is obtained with an ".arch armv5t"
pseudo op in the assembly file that uses armv5t instructions.
R=golang-dev, iant, dave
CC=golang-dev
https://golang.org/cl/14511044
Joel Sing [Mon, 7 Oct 2013 16:12:17 +0000 (09:12 -0700)]
os/user: enable tests on all supported platforms
All of the currently supported platforms have a working user
implementation and do not use stubs. As a result, enable the tests
on all platforms rather than whitelisting.
Keith Randall [Fri, 4 Oct 2013 20:54:03 +0000 (13:54 -0700)]
runtime: fix bug in maps at the intersection of iterators, growing, and NaN keys
If an iterator is started while a map is in the middle of a grow,
and the map has NaN keys, then those keys might get returned by
the iterator more than once. This fix makes the evacuation decision
deterministic and repeatable for NaN keys so each one gets returned
only once.