This implements the same choices made in the gc runtime, except that
for 32-bit x86 we only use the fence instruction if the processor
supports SSE2.
The code here is hacked up for speed; the gc runtime uses straight
assembler.
Reviewed-on: https://go-review.googlesource.com/97715
From-SVN: r258336
PR go/84484
libgo: add support for riscv64
Patch by Andreas Schwab.
Reviewed-on: https://go-review.googlesource.com/96377
* go.test/go-test.exp (go-set-goarch): Recognize riscv64-*-*.
From-SVN: r257914
Let a fast syscall return be a preemption point. This helps with
tight loops that make system calls, as in BenchmarkSyscallExcessWork.
Reviewed-on: https://go-review.googlesource.com/94895
From-SVN: r257848
Long long long ago Go permitted writing
func F()
in one file and writing
func F() {}
in another file. This was removed from the language, and that is now
considered to be a multiple definition error. Gccgo never caught up
to that, and it has been permitting this invalid code for some time.
Stop permitting it, so that we give correct errors. Since we've
supported it for a long time, the compiler uses it in a couple of
cases: it predeclares the hash/equal methods if it decides to create
them while compiling another function, and it predeclares main.main as
a mechanism for getting the right warning if a program uses the wrong
signature for main. For simplicity, keep those existing uses.
This required a few minor changes in libgo which were relying,
unnecessarily, on the current behavior.
Reviewed-on: https://go-review.googlesource.com/93083
From-SVN: r257600
PR go/84215
runtime, sync/atomic: use write barrier for atomic pointer functions
This copies atomic_pointer.go from 1.10rc2. It was omitted during the
transition of the runtime from C to Go, and I forgot about it.
This may help with https://gcc.gnu.org/PR84215.
Reviewed-on: https://go-review.googlesource.com/93197
From-SVN: r257599
If we trace back through code that has no debug info, as when calling
through C code compiled with -g0, we won't have a function name.
Try to fetch the function name using the symbol table.
Adding the test case revealed that gotest failed to use the gccgo tag
when matching files, so add that.
Reviewed-on: https://go-review.googlesource.com/92756
From-SVN: r257495
The escape analysis support is not yet good enough to avoid escaping
the argument to funcPC. This causes unnecessary and often harmful
memory allocation. E.g., (*cpuProfile).addExtra can be called from a
signal handler, and it must not allocate memory.
Move the calls to funcPC to use variables instead. This was done in
the original migration to using funcPC, but was not done for newer code.
In one case, in signal handling code, use getSigtramp.
Reviewed-on: https://go-review.googlesource.com/92735
From-SVN: r257463
The quoting code that read _cgo_flags, currently only in the gccgo
version of cmd/go, was losing the last flag read from the file.
Fixesgolang/go#23666
Reviewed-on: https://go-review.googlesource.com/91655
From-SVN: r257373
They were disabled due to the lack of escape analysis. Now that
we have escape analysis, unskip these tests.
Reviewed-on: https://go-review.googlesource.com/86248
From-SVN: r257324
On ia64, a separate stack is used for saving/restoring register frames,
occupying the other end of the stack mapping. This must also be scanned
for pointers into the heap.
Reviewed-on: https://go-review.googlesource.com/85276
From-SVN: r257323
We were using special compilation flags for the math package, but we
weren't using them when testing. That meant that our tests were not
checking the real code we were providing. Fix that.
Fixing that revealed that we were not using a good set of flags, or at
least were not using flags that let the tests pass. Adjust the flags
to stop using -funsafe-math-optimizations on x86. Instead always use
-ffp-contract=off -fno-math-errno -fno-trapping-math for all targets.
Fixesgolang/go#23647
Reviewed-on: https://go-review.googlesource.com/91355
From-SVN: r257312
Otherwise on a 64-bit system we will read the 32-bit value as a 64-bit
value. Since getaddrinfo returns negative numbers as error values,
these will be interpreted as numbers like 0xfffffffe rather than -2,
and the comparisons with values like syscall.EAI_NONAME will fail.
Fixesgolang/go#23645
Reviewed-on: https://go-review.googlesource.com/91296
From-SVN: r257299
I forgot to update the name of the map[string]bool type descriptor
used in go-fieldtrack.c. This didn't cause any errors because it's a
weak symbol, and the current testsuite has no field tracking tests.
Reviewed-on: https://go-review.googlesource.com/91096
From-SVN: r257249
On AIX nm displays symbols with a leading dot; don't discard such
symbols.
While we're here stop doing fgrep -v '$', symbol names no longer
contain '$' anyhow.
Reviewed-on: https://go-review.googlesource.com/91095
From-SVN: r257247
On ppc64 gotest treats data variables whose names begin with "Test" as
tests to run. This is to support the function descriptors used for
ppc64 ELF ABI v1. This causes gotest to think that TestAddr6 is a
test, when it is actually a variable. For a simple fix until we can
figure out how to write gotest properly, rename the variable.
Fixesgolang/go#23623
Reviewed-on: https://go-review.googlesource.com/90995
From-SVN: r257235
CL 84555 added support for the SuperH architecture, but didn't add the
randomTrap definition to be used for the getrandom syscall on Linux.
Add it now.
Reviewed-on: https://go-review.googlesource.com/90535
From-SVN: r257171
This was the original intent, as reflected in the long comment at the
start of names.cc, but I forgot to implement it.
Also, remove a leading ".0" from the final name. That could occur for
a method whose receiver type starts with 'u', as in that case we
prepend a space to the mangled name, to avoid confusion with the
Unicode mangling, and the space turns into ".0".
Also, if the Unicode encoding would cause the final to start with
"..u" or "..U", add a leading underscore.
Patch gotest to not get fooled by some names.
The result of these changes is that all symbols start with a letter or
an underscore.
Reviewed-on: https://go-review.googlesource.com/90015
From-SVN: r257068
The top three region number bits must be masked out before
right-shifting the address bits into place, otherwise they will be
copied down into the lower always-zero address bits.
Reviewed-on: https://go-review.googlesource.com/84535
From-SVN: r257061
Encode all external symbol names using only ASCII alphanumeric
characters, underscore, and dot. Use a scheme that can be reliably
demangled to a somewhat readable version as described in the long
comment in names.cc.
A minor cleanup discovered during this was that we were treating
function types as different if one had a NULL parameters_ field and
another has a non-NULL parameters_ field that has no parameters. This
worked because we mangled them slightly differently. We now mangle
them the same, so we treat them as equal, as we should anyhow.
Reviewed-on: https://go-review.googlesource.com/89555
* go.go-torture/execute/names-1.go: New test.
From-SVN: r257033
This makes no difference on most systems, because <sys/resource.h>
renames the type appropriately anyhow, but apparently it makes a
difference on AIX.
Reviewed-on: https://go-review.googlesource.com/88076
From-SVN: r256877
Solaris 10 uses int32 for the Pw_uid and Pw_gid fields of Passwd,
but most systems, including Solaris 11, use uint32. Force uint32
for consistency and to fix the build.
Reviewed-on: https://go-review.googlesource.com/88195
From-SVN: r256875
PR go/83787
compiler: pass int to makechan, call makechan64 when appropriate
The update to 1.10beta1 changed makechan to take int instead of int64,
and added a makechan64 call for large values. Since the size is the
last argument to makechan, the old compiler which always passed a
64-bit int worked fine on 64-bit systems and little-endian 32-bit
systems, but broke on big-endian 32-bit systems. This CL fixes the
compiler to use the appropriate types.
This fixes GCC PR 83787.
Reviewed-on: https://go-review.googlesource.com/88077
From-SVN: r256835
Move the architecture-specific settings out of configure.ac into a new
shell script goarch.sh. Use the new script to collect the values for
all architectures to make them available in go/types.
Also fix cmd/vet to pass the right compiler when it calls SizesFor.
This fixes cmd/vet for systems that are not implemented in the gc
toolchain, such as alpha and ia64.
Reviewed-on: https://go-review.googlesource.com/87635
From-SVN: r256655
Add missing .a files. These should have been committed with the
update to go1.10beta1, but were skipped because by default Subversion
ignores all files matching *.a.
From-SVN: r256442
PR c/82922
runtime, syscall: use full prototypes in C code
Based on patch by Martin Sebor.
Reviewed-on: https://go-review.googlesource.com/86815
From-SVN: r256437
GCC always recognizes the -fsplit-stack option, but then tests whether
it is supported by the selected target. If not, it reports
cc1: error: ‘-fsplit-stack’ is not supported by this compiler configuration
Check for that error message when deciding whether a compiler option works.
Reviewed-on: https://go-review.googlesource.com/87137
From-SVN: r256433
The signature of makemap changed with the update to 1.10beta1,
but I forgot to update the call from C code.
Reviewed-on: https://go-review.googlesource.com/87135
From-SVN: r256431
When compiling runtime, it is not allowed for local variables
and closures to be heap allocated. In one test, there is a go
statement with a closure. In the gc compiler, it distinguishes
capturing variable by value vs. by address, and rewrites it to
passing the captured values as arguments. Currently we don't
have this, and the escape analysis decides to heap allocate the
closure and also the captured variables, which is not allowed.
Work around it by passing the variables explicitly.
This is in preparation of turning on escape analysis for the
runtime.
Reviewed-on: https://go-review.googlesource.com/86245
From-SVN: r256419
This is in preparation of turning on escape analysis for the
runtime.
- In gccgo, systemstack is implemented with mcall, which is not
go:noescape. Wrap the closure in noescape so the escape analysis
does not think it escapes.
- Mark some C functions go:noescape. They do not leak arguments.
- Use noescape function to make a few local variables' addresses
not escape. The escape analysis cannot figure out because they
are assigned to pointer indirections.
Reviewed-on: https://go-review.googlesource.com/86244
From-SVN: r256418
Update the Go library to the 1.10beta1 release.
Requires a few changes to the compiler for modifications to the map
runtime code, and to handle some nowritebarrier cases in the runtime.
Reviewed-on: https://go-review.googlesource.com/86455
gotools/:
* Makefile.am (go_cmd_vet_files): New variable.
(go_cmd_buildid_files, go_cmd_test2json_files): New variables.
(s-zdefaultcc): Change from constants to functions.
(noinst_PROGRAMS): Add vet, buildid, and test2json.
(cgo$(EXEEXT)): Link against $(LIBGOTOOL).
(vet$(EXEEXT)): New target.
(buildid$(EXEEXT)): New target.
(test2json$(EXEEXT)): New target.
(install-exec-local): Install all $(noinst_PROGRAMS).
(uninstall-local): Uninstasll all $(noinst_PROGRAMS).
(check-go-tool): Depend on $(noinst_PROGRAMS). Copy down
objabi.go.
(check-runtime): Depend on $(noinst_PROGRAMS).
(check-cgo-test, check-carchive-test): Likewise.
(check-vet): New target.
(check): Depend on check-vet. Look at cmd_vet-testlog.
(.PHONY): Add check-vet.
* Makefile.in: Rebuild.
From-SVN: r256365
Remove -fplan9-extensions from the CFLAGS used for libgo (no
longer needed since the runtime was converted from C to Go).
Reviewed-on: https://go-review.googlesource.com/82177
From-SVN: r255445
The functions cgoCheckPointer and cgoCheckResult are called by code
generated by cgo. That means that we need to export them using
go:linkname, as otherwise they are local symbols. The cgo code
currently uses weak references to only call the symbols if they are
defined, which is why it has been working--the cgo code has not been
doing any checks.
Reviewed-on: https://go-review.googlesource.com/80295
From-SVN: r255347
Fix a small bug in the libgo Makefile recipe that constructs the
directory from which to pick up libgcc_s.so ; the gccgo invocation
with -print-libgcc-file-name was missing the flags, which meant that
for -m32 builds we'd see the 64-bit libgcc dir.
Reviewed-on: https://go-review.googlesource.com/78836
From-SVN: r254984
With the change in the Solaris release model (no more major releases
like Solaris 12 but only minor ones like 11.4), the Solaris 12
references in GCC need to be adapted.
Patch by Rainer Orth.
Reviewed-on: https://go-review.googlesource.com/77490
From-SVN: r254729
For a misaligned address force a panic rather than assuming that reading
from the address 0 will cause one.
Reviewed-on: https://go-review.googlesource.com/69850
From-SVN: r254610
"make check" runs make recursively to check each package. Pass
the flags through. So it is possible to run "make check" with
different settings easily.
Reviewed-on: https://go-review.googlesource.com/76029
From-SVN: r254475
Also fix 64-bit DWARF to read a 64-bit abbrev offset in the
compilation unit.
This is a backport of https://golang.org/cl/71171, which will be in
the Go 1.10 release, to the gofrontend copy. Doing it now because AIX
is pretty much the only system that uses 64-bit DWARF.
Reviewed-on: https://go-review.googlesource.com/72250
From-SVN: r253955
With -enable-static=no we don't build non-pic objects, but libgotool.a
is built from non-pic objects. Build the packages that go into
libgotool.a in static mode in all cases.
Also ensure that internal test packages are built, since nothing
explicitly depended on them.
Reviewed-on: https://go-review.googlesource.com/65050
From-SVN: r253042
In preparation for upgrading libgo to the 1.9 release, this
approximately incorporates https://golang.org/cl/37661 and
https://golang.org/cl/38351.
CL 37661 changed the gc compiler such that the select statement simply
returns an integer which is then used as the argument for a switch.
Since gccgo already worked that way, this just adjusts the switch code
to look like the gc switch code by removing the explicit case index
expression and calculating it from the order of calls to selectsend,
selectrecv, and selectdefault.
CL 38351 simplifies the channel code by not passing the unused channel
type descriptor pointer.
Reviewed-on: https://go-review.googlesource.com/62730
From-SVN: r252749
This adds much of https://golang.org/cl/35731 and
https://golang.org/cl/35732 to the gofrontend code.
This is a step toward updating libgo to the 1.9 release. The
gofrontend already supports type aliases, and this is required for
correct support of type aliases when used as embedded fields.
The change to expressions.cc is to handle the << 1, used for the
newly renamed offsetAnon field, in the constant context used for type
descriptor initialization.
Reviewed-on: https://go-review.googlesource.com/62710
From-SVN: r252746
Using -funwind-tables is necessary to permit Go code to correctly
throw a panic through C code. This hasn't been necessary in the past
as -funwind-tables is the default on x86. However, it is not the
default for PPC AIX.
Reviewed-on: https://go-review.googlesource.com/56650
From-SVN: r251179
Libgo's implementation of math.Ldexp declared the libc "ldexp" as
taking an 'int' exponent argument, which is not quite right for 64-bit
platforms (exp arg is always int32); this could yield incorrect
results for exponent values outside the range of Minint32/Maxint32.
Fix by upating the type for the libc version of ldexp, and adding
guards to screen for out-of-range exponents.
Fixes#21323.
Reviewed-on: https://go-review.googlesource.com/54250
From-SVN: r250992
We unconditionally set _FILE_OFFSET_BITS to 64 in configure.ac, so we
should unconditionally call the statfs64 and fstatfs64 functions.
These functions should be available on all versions of GNU/Linux since 2.6.
On 64-bit systems they are aliased to statfs/fstatfs, and on 32-bit
systems they use the 64-bit data structures.
Fixesgolang/go#20922
Reviewed-on: https://go-review.googlesource.com/50635
From-SVN: r250443
If getSiginfo does not know how to determine the PC, it will call
runtime_callers. That can happen in a thread that was started by
non-Go code, in which case the TLS variable g will not be set, in
which case runtime_lock will crash.
Avoid the problem by using atomic operations for the lock. This is OK
since creating a backtrace state is fast and never blocks.
The test case is TestCgoExternalThreadSIGPROF in the runtime package
on a system that getSiginfo doesn't handle specially.
Updates golang/go#20931
Reviewed-on: https://go-review.googlesource.com/50650
From-SVN: r250439
Ian Lance Taylor