Removes the encoding of this bit which was ignored but left behind
for 1.7 to minimize pre-1.7 export format changes. See the issue
for more details.
Fixes#15772.
Change-Id: I46cd7a66ad4c6003b78c64295cf3bda503ebf2dd
Reviewed-on: https://go-review.googlesource.com/27201
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
GOARCH=386 SSATEST=1 ./all.bash passes
Caveat: still needs changes to test/ files to use *_ssa.go versions. I
won't check those changes in with this CL because the builders will
complain as they don't have SSATEST=1.
Mostly minor fixes.
Implement float <-> uint32 in assembly. It seems the simplest option
for now.
GO386=387 does not work. That's why I can't make SSA the default for
386 yet.
Change-Id: Ic4d4402104d32bcfb1fd612f5bb6539f9acb8ae0
Reviewed-on: https://go-review.googlesource.com/25119
Reviewed-by: Cherry Zhang <cherryyz@google.com>
The new export format keeps track of all types that are exported.
If a type is seen that was exported before, only a reference to
that type is emitted. The importer maintains a list of all the
seen types and uses that list to resolve type references.
The existing compiler infrastructure's invariants assumes that
only named types are referred to before they are fully set up.
Referring to unnamed incomplete types causes problems. One of
the issues was #15548.
Added a new internal flag 'trackAllTypes' to enable/disable
this type tracking. With this change only named types are
tracked.
Verified that this fix also addresses #15548, even w/o the
prior fix for that issue (in fact that prior fix is turned
off if trackAllTypes is disabled because it's not needed).
The test for #15548 covers also this change.
For #15548.
Change-Id: Id0b3ff983629703d025a442823f99649fd728a56
Reviewed-on: https://go-review.googlesource.com/22839
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
builtin.go was auto-generated via go generate; all other
changes were manual.
The new format reduces the export data size by ~65% on average
for the std library packages (and there is still quite a bit of
room for improvement).
The average time to write export data is reduced by (at least)
62% as measured in one run over the std lib, it is likely more.
The average time to read import data is reduced by (at least)
37% as measured in one run over the std lib, it is likely more.
There is also room to improve this time.
The compiler transparently handles both packages using the old
and the new format.
Comparing the -S output of the go build for each package via
the cmp.bash script (added) shows identical assembly code for
all packages, but 6 files show file:line differences:
The following files have differences because they use cgo
and cgo uses different temp. directories for different builds.
Harmless.
src/crypto/x509
src/net
src/os/user
src/runtime/cgo
The following files have file:line differences that are not yet
fully explained; however the differences exist w/ and w/o new export
format (pre-existing condition). See issue #15453.
src/go/internal/gccgoimporter
src/go/internal/gcimporter
In summary, switching to the new export format produces the same
package files as before for all practical purposes.
How can you tell which one you have (if you care): Open a package
(.a) file in an editor. Textual export data starts with a $$ after
the header and is more or less legible; binary export data starts
with a $$B after the header and is mostly unreadable. A stand-alone
decoder (for debugging) is in the works.
In case of a problem, please first try reverting back to the old
textual format to determine if the cause is the new export format:
For a stand-alone compiler invocation:
- go tool compile -newexport=0 <files>
For a single package:
- go build -gcflags="-newexport=0" <pkg>
For make/all.bash:
- (export GO_GCFLAGS="-newexport=0"; sh make.bash)
Fixes#13241.
Change-Id: I2588cb463be80af22446bf80c225e92ab79878b8
Reviewed-on: https://go-review.googlesource.com/22123
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
mapaccess{1,2} returns a pointer to the value. When the key
is not in the map, it returns a pointer to zeroed memory.
Currently, for large map values we have a complicated scheme which
dynamically allocates zeroed memory for this purpose. It is ugly
code and requires an atomic.Load in a bunch of places we'd rather
not have it.
Switch to a scheme where callsites of mapaccess{1,2} which expect
large return values pass in a pointer to zeroed memory that
mapaccess can return if the key is not found. This avoids the
atomic.Load on all map accesses with a few extra instructions only
for the large value acccesses, plus a bit of bss space.
There was a time (1.4 & 1.5?) where we did something like this but
all the tricks to make the right size zero value were done by the
linker. That scheme broke in the presence of dyamic linking.
The scheme in this CL works even when dynamic linking.
Fixes#12337
Change-Id: Ic2d0319944af33bbb59785938d9ab80958d1b4b1
Reviewed-on: https://go-review.googlesource.com/22221
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
Also eliminates per-maptype hiter and hmap types, since they're not
really needed anyway. Update packages reflect and runtime
accordingly.
Reduces golang.org/x/tools/cmd/godoc's text segment by ~170kB:
text data bss dec hex filename
13085702 140640 151520 13377862 cc2146 godoc.before
12915382 140640 151520 13207542 c987f6 godoc.after
Updates #6853.
Change-Id: I948b2bc1f22d477c1756204996b4e3e1fb568d81
Reviewed-on: https://go-review.googlesource.com/16610
Reviewed-by: Keith Randall <khr@golang.org>
These functions are really simple, the overhead of calling
them (in both time and code size) is larger than the inlined versions.
Reorganize how the nil case in a type switch is handled, as we have
to check for nil explicitly now anyway.
Saves about 0.8% in the binary size of the go tool.
Change-Id: I8501b62d72fde43650b79f52b5f699f1fbd0e7e7
Reviewed-on: https://go-review.googlesource.com/19814
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
The export data format was augmented with a new "unsafe-uintptr" tag
in https://golang.org/cl/18584, but builtin.go was not regenerated.
While here, add a test to make sure builtin.go stays up to date in the
future.
Change-Id: I4ae17da29f0855bef6ec0fcc10e7082c8427d39c
Reviewed-on: https://go-review.googlesource.com/19681
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Changes largely in preparation for eventually switching the builtin
export data to use the new binary format.
Replace fancy incremental line-by-line scanning with simply reading
the entire object file into memory, finding the export data section,
and processing it that way.
Just use "package runtime" and "package unsafe" in the builtin Go
source files so we don't need to rewrite references to "PACKAGE".
Stop looking for init_PACKAGE_function; it doesn't exist anyway.
Compile package runtime with -u so that its export data marks it as a
"safe" package.
Eliminate requirement to pass "runtime" and "unsafe" as command-line
arguments so that just "go run mkbuiltin.go" works.
Only rewrite builtin.go when successful.
Change-Id: I4addfde9e0cfb30607c7a83de686bde0ad1f035a
Reviewed-on: https://go-review.googlesource.com/19624
Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
If you set GODEBUG=cgocheck=2 the runtime package will use the write
barrier to detect cases where a Go program writes a Go pointer into
non-Go memory. In conjunction with the existing cgo checks, and the
not-yet-implemented cgo check for exported functions, this should
reliably detect all cases (that do not import the unsafe package) in
which a Go pointer is incorrectly shared with C code. This check is
optional because it turns on the write barrier at all times, which is
known to be expensive.
Update #12416.
Change-Id: I549d8b2956daa76eac853928e9280e615d6365f4
Reviewed-on: https://go-review.googlesource.com/16899
Reviewed-by: Russ Cox <rsc@golang.org>
Following a recent change, file builtin.go is not up-to-date.
Generate it again by running go generate.
Fixes#13203
Change-Id: Ib91c5ccc93665c043da95c7d3783ce5d94e48466
Reviewed-on: https://go-review.googlesource.com/16821
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The -msan option causes the compiler to add instrumentation for the
C/C++ memory sanitizer. Every memory read/write will be preceded by
a call to msanread/msanwrite.
This CL passes tests but is not usable by itself. The actual
implementation of msanread/msanwrite in the runtime package, and support
for -msan in the go tool and the linker, and tests, will follow in
subsequent CLs.
Change-Id: I3d517fb3e6e65d9bf9433db070a420fd11f57816
Reviewed-on: https://go-review.googlesource.com/16160
Reviewed-by: David Crawshaw <crawshaw@golang.org>
The new inlined code for append assumed that it could pass the
desired new cap to growslice, not the number of new elements.
But growslice still interpreted the argument as the number of new elements,
making it always grow by >2x (more precisely, 2x+1 rounded up
to the next malloc block size). At the time, I had intended to change
the other callers to use the new cap as well, but it's too late for that.
Instead, introduce growslice_n for the old callers and keep growslice
for the inlined (common case) caller.
Fixes#11403.
Filed #11419 to merge them.
Change-Id: I1338b1e5b352f3be4e43641f44b652ef7195251b
Reviewed-on: https://go-review.googlesource.com/11541
Reviewed-by: Austin Clements <austin@google.com>
Trivial merging of 5g, 6g, ... into go tool compile,
and similarlly 5l, 6l, ... into go tool link.
The files compile/main.go and link/main.go are new.
Everything else in those directories is a move followed by
change of imports and package name.
This CL breaks the build. Manual fixups are in the next CL.
See golang-dev thread titled "go tool compile, etc" for background.
Change-Id: Id35ff5a5859ad9037c61275d637b1bd51df6828b
Reviewed-on: https://go-review.googlesource.com/10287
Reviewed-by: Dave Cheney <dave@cheney.net>
Reviewed-by: Rob Pike <r@golang.org>
2015-05-21 17:31:51 +00:00
Renamed from src/cmd/internal/gc/builtin.go (Browse further)
