On NetBSD, for backwards compatibility, various libc symbols are
renamed to a symbol with a version suffix. For example, this is the
(abbreviated) definition of sigaction:
int sigaction(...) __asm__ ("__sigaction14")
This poses a challenge for libgo, which attempts to link sigaction by
way of an "//extern" comment:
//extern sigaction
func sigaction(...)
This results in a reference to the deprecated compatibility symbol
"sigaction", rather than the desired "__sigaction14" symbol.
This patch introduces a new "//extern-sysinfo" comment to handle this
situation. The new mklinknames.awk script scans a package for these
comments and outputs a "//go:linkname" directive that links the wrapper
to the correct versioned symbol, as determined by parsing the __asm__
annotation on the function's declaration in gen-sysinfo.go.
For now, only the following packages are scanned by mklinknames.awk:
os
os/user
runtime
syscall
gotools/:
* Makefile.am (check-runtime): Add runtime_linknames.go to
--extrafiles.
* Makefile.in: Regenerate.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/265125
Only compile the __go_ptrace varargs shim on Linux to avoid compilation
failures on some other platforms. The C ptrace function is not entirely
portable (e.g., NetBSD has `int data` instead of `void* data`), and so
far Linux is the only platform that needs the varargs shim.
Additionally, make the types in the ptrace and raw_ptrace function
declarations match. This makes it more clear that the only difference
between the two is that calls via the former are allowed to block while
calls via the latter are not.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/263517
The backwards-compatibility guarantees of the syscall package
require some munging of the C API inferred by mksysinfo.sh.
Specifically, the RTM_RESOLVE constant must be added if it is
missing, and the stat_t struct must use the suffix "timespec"
rather than "tim" for its time-related fields.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/263519
Make the types of the addr and data arguments in the __go_ptrace shim
match the types declared in Go and the types declared by the C ptrace
function, i.e., void*. This avoids a warning about an implicit
int-to-pointer cast on some platforms.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/262340
Calls to _Unwind_RaiseException and friends *can* return due to bugs in
libgo or memory corruption. When this occurs, print a message to stderr
with the reason code before aborting to aid debugging.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/261257
The syscall package depends on many NetBSD-specific types on NetBSD.
Teach mksysinfo.sh to export these types.
This alone is not sufficient to get the syscall package to compile on
NetBSD, but it's a start.
Note that the IfMsgHdr type is recapitalized to IfMsghdr, which requires
changes in the AIX port. The new capitalization is what's used by
upstream in existing NetBSD-specific code and is more consistent with
the capitalization of other C structs with the "hdr" suffix.
Updates golang/go#38538.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/261739
NetBSD's semaphores use the underlying lighweight process mechanism
(LWP) on NetBSD, rather than pthreads. This means the m.prodcid needs
to be set to the LWP ID rather than the pthread ID in order for unpark
notifications to get sent to the right place.
Introduce a new getProcID() method that selects the correct ID for the
platform.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/261742
NetBSD does not include the null terminator when in its reported socket
length. Port the upstream bugfix for the issue (#6627).
This was likely missed during the usual upstream merge because the gc
and gccgo socket implementations have diverged quite a bit.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/261741
On AIX, duplication of type descriptors can occur if one is
declared in the libgo and one in the Go program being compiled.
The AIX linker isn't able to merge them together as Linux one does.
One solution is to always load libgo first but that needs a huge mechanism in
gcc core. Thus, this patch ensures that the duplication isn't visible
for the end user.
In reflect and internal/reflectlite, the comparison of rtypes is made on their
name and not only on their addresses.
In reflect, toType() function is using a canonicalization map to force rtypes
having the same rtype.String() to return the same Type. This can't be made in
internal/reflectlite as it needs sync package. But, for now, it doesn't matter
as internal/reflectlite is not widely used.
Fixesgolang/go#39276
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/260158
match.sh was not correctly handling build constraints for Go versions
that have a two-digit suffix, like "go1.10".
The same issue will arise with Go 1.100, but that is a long ways off.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/260077
AIX ptrace syscalls doesn't have the same semantic than the glibc one.
The syscall package is already handling it correctly so disable the new
__go_ptrace C function for AIX.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/256777
ptrace is actually declared as a variadic function. On ppc64le
the ABI requires to the caller to allocate space for the parameters
and allows the caller to modify them.
On ppc64le, depending on how and what version of GCC is used,
it will save to parameter save area. This happened to clobber
a saved LR, and caused syscall.TestExecPtrace to fail with a timeout
when the tracee segfaults, and waits for the parent process to inspect.
Wrap this function to avoid directly calling glibc's ptrace from go.
Fixesgolang/go#36698
Fixes go/92567
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/254755
Replace the U+00B7 middle dot character, placed after "mips64p32le"
in the target lists, with a space. The U+00B7 character may not be
considered whitespace by Bourne shell and any non-ASCII character
may render incorrectly in some terminal devices.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/251177
AIX linker is not able to merge identical type descriptors in a single
symbol if there are coming from different object or shared object files.
This results into several pointers referencing the same type
descriptors.
Thus, eqtype is needed to ensure that these different symbols will be
considered as the same type descriptor.
Fixesgolang/go#39276
gcc/go/ChangeLog:
* go-c.h (struct go_create_gogo_args): Add need_eqtype field.
* go-lang.c (go_langhook_init): Set need_eqtype.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/235697
This ports https://golang.org/cl/227163 to the Go frontend.
This is a step toward moving up to the go1.15rc1 release.
Original CL description:
cmd/compile,runtime: pass only ptr and len to some runtime calls
Some runtime calls accept a slice, but only use ptr and len.
This change modifies most such routines to accept only ptr and len.
After this change, the only runtime calls that accept an unnecessary
cap arg are concatstrings and slicerunetostring.
Neither is particularly common, and both are complicated to modify.
Negligible compiler performance impact. Shrinks binaries a little.
There are only a few regressions; the one I investigated was
due to register allocation fluctuation.
Passes 'go test -race std cmd', modulo golang/go#38265 and golang/go#38266.
Wow, does that take a long time to run.
file before after Δ %
compile 19655024 19655152 +128 +0.001%
cover 5244840 5236648 -8192 -0.156%
dist 3662376 3658280 -4096 -0.112%
link 6680056 6675960 -4096 -0.061%
pprof 14789844 14777556 -12288 -0.083%
test2json 2824744 2820648 -4096 -0.145%
trace 11647876 11639684 -8192 -0.070%
vet 8260472 8256376 -4096 -0.050%
total 115163736 115118808 -44928 -0.039%
For golang/go#36890
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/245099
AIX-style libraries contains both 32 and 64 bit shared objects.
This patch follows the adding of FAT libraries support in other gcc
libraries (libgcc, listdc++, etc).
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/242957
Ian Lance Taylor
Nikhil Benesch
Clément Chigot
Maciej W. Rozycki
Clément Chigot
Paul E. Murphy
Than McIntosh
Tobias Klauser