For now, the constraint's underlying type set must be a single
type that is sliceable.
Change-Id: I08b6a2e88fe35e8238a95b3f40dc969689021a0f
Reviewed-on: https://go-review.googlesource.com/c/go/+/354070
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
In case of amd64 the compiler issues checks if extensions are
available on a platform. With GOAMD64 microarchitecture levels
provided, some of the checks could be eliminated.
Change-Id: If15c178bcae273b2ce7d3673415cb8849292e087
Reviewed-on: https://go-review.googlesource.com/c/go/+/352010
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
roundsd and FMA (vfmadd231sd).
Change-Id: I2d91332667e577bd9bb903ac58904f62b8454128
Reviewed-on: https://go-review.googlesource.com/c/go/+/354069
Trust: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
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Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This is a clean port of CL 353831 from go/types to types2.
For #47916.
Change-Id: I2c2b9c7bbcd416fb21f3032c55a06406bad9334a
Reviewed-on: https://go-review.googlesource.com/c/go/+/353934
Trust: Robert Griesemer <gri@golang.org>
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Reviewed-by: Robert Findley <rfindley@google.com>
When compiling with GOAMD64=v1, clobber all the >v1 instructions
with faulting instructions. Run the binary with the corresponding
feature flags off. We shouldn't try to execute any of the clobbered
instructions.
Change-Id: I295acaf9fd0eafd037192aa6f933365c794cc76e
Reviewed-on: https://go-review.googlesource.com/c/go/+/352831
Run-TryBot: Keith Randall <khr@golang.org>
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Trust: Keith Randall <khr@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This is like CL 304432 and CL 307229, for XCOFF.
With this, GOEXPERIMENT=regabi works on AIX/PPC64.
Change-Id: I8cf00681df5c93f397913febd78f38099d91e7c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/353972
Trust: Cherry Mui <cherryyz@google.com>
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Reviewed-by: Than McIntosh <thanm@google.com>
Every function has associated numbered extra funcdata to another symbol.
Prior to this change, a funcdata pointer was stored as a relocation.
This change alters this to be an offset relative to go.func.* or go.funcrel.*.
This reduces the number of relocations on darwin/arm64 by about 40%.
It also shrinks externally linked binaries. On darwin/arm64:
size before after Δ %
addr2line 3788498 3699730 -88768 -2.343%
api 5100018 4951074 -148944 -2.920%
asm 4855234 4744274 -110960 -2.285%
buildid 2500162 2419986 -80176 -3.207%
cgo 4338258 4218306 -119952 -2.765%
compile 22764418 22132226 -632192 -2.777%
cover 4583186 4432770 -150416 -3.282%
dist 3200962 3094626 -106336 -3.322%
doc 3680402 3583602 -96800 -2.630%
fix 3114914 3023922 -90992 -2.921%
link 6308578 6154786 -153792 -2.438%
nm 3754338 3665826 -88512 -2.358%
objdump 4124738 4015234 -109504 -2.655%
pack 2232626 2155010 -77616 -3.476%
pprof 13497474 13044066 -453408 -3.359%
test2json 2483810 2402146 -81664 -3.288%
trace 10108898 9748802 -360096 -3.562%
vet 6884322 6681314 -203008 -2.949%
total 107320836 104167700 -3153136 -2.938%
relocs before after Δ %
addr2line 33357 25563 -7794 -23.365%
api 31589 18409 -13180 -41.723%
asm 27825 18904 -8921 -32.061%
buildid 15603 9513 -6090 -39.031%
cgo 27809 17103 -10706 -38.498%
compile 114769 64829 -49940 -43.513%
cover 32932 19462 -13470 -40.902%
dist 18797 10796 -8001 -42.565%
doc 22891 13503 -9388 -41.012%
fix 19700 11465 -8235 -41.802%
link 37324 23198 -14126 -37.847%
nm 33226 25480 -7746 -23.313%
objdump 35237 26610 -8627 -24.483%
pack 13535 7951 -5584 -41.256%
pprof 97986 63961 -34025 -34.724%
test2json 15113 8735 -6378 -42.202%
trace 66786 39636 -27150 -40.652%
vet 43328 25971 -17357 -40.060%
total 687806 431088 -256718 -37.324%
It should also incrementally speed up binary launching
and may reduce linker memory use.
This is another step towards removing relocations so
that pages that were previously dirtied by the loader may remain clean,
which will offer memory savings useful in constrained environments like iOS.
Removing the relocations in .stkobj symbols will allow some simplifications.
There will be no references into go.funcrel.*,
so we will no longer need to use the bottom bit to distinguish offset bases.
Change-Id: I83d34c1701d6f3f515b9905941477d522441019d
Reviewed-on: https://go-review.googlesource.com/c/go/+/352110
Trust: Josh Bleecher Snyder <josharian@gmail.com>
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This change moves all symbols referred to by FUNCDATA
into go.func.* and go.funcrel.*.
Surprisingly (because it inhibits some content-addressability),
it shrinks binaries by a little bit, about 0.1%.
This paves the way for a subsequent change to change
FUNCDATA relocations to offsets.
Change-Id: I70e487205073699f442192b0791cc92da5663057
Reviewed-on: https://go-review.googlesource.com/c/go/+/352189
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
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Reviewed-by: Cherry Mui <cherryyz@google.com>
In testing the register ABI changes I found that the benchmarks
for strhash and memhash degraded unless I marked them as
ABIInternal. This fixes that.
Change-Id: I9c7a04eaa6a66b888877f43454c51277c07e638a
Reviewed-on: https://go-review.googlesource.com/c/go/+/353832
Reviewed-by: Cherry Mui <cherryyz@google.com>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
CL 269999 added support for getrandom on Dragonfly.
CL 299134 added support for getrandom on Solaris.
CL 302489 added support for getentropy on macOS.
Update the godoc for Reader accordingly.
Change-Id: Ice39e5e62f052f21b664db6abbfd97f03944586e
Reviewed-on: https://go-review.googlesource.com/c/go/+/353190
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
After CL 353871, darwin/arm64 now do concurrent build, so enable the
test for it.
Updates #48490
Change-Id: I29336f6fc7d7d2f463d8ad2a620534bd7f048d2c
Reviewed-on: https://go-review.googlesource.com/c/go/+/353949
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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Reviewed-by: Bryan C. Mills <bcmills@google.com>
We don't need cmd/cgo for building go_bootstrap or toolchain2, so skip
building it as part of toolchain1.
This allows cmd/cgo to assume a current go/ast; e.g., that
ast.IndexListExpr exists (needed for next CL).
Change-Id: I642bba780bf273e6ea9c6e7c5d5d7ccfe86bf462
Reviewed-on: https://go-review.googlesource.com/c/go/+/353884
Trust: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
runtime.gcbits symbols are pointer masks, which are just bytes.
Change-Id: I6e86359451c7da69da435e1928e55712dd904047
Reviewed-on: https://go-review.googlesource.com/c/go/+/353571
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
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Use sort.Search instead of open-coding the binary search.
This makes the code a lot easier to work on.
As a bonus, it speeds it up.
name old time/op new time/op delta
115/LineToPC-8 57.4µs ± 5% 59.2µs ± 8% +3.19% (p=0.003 n=15+13)
115/PCToLine-8 255ns ± 1% 192ns ± 3% -24.63% (p=0.000 n=15+15)
Change-Id: I41da18bfb0e745c40d24e5b96e50dfdd0c3b79f5
Reviewed-on: https://go-review.googlesource.com/c/go/+/353879
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Change-Id: I827a9702dfa01b712b88331668434f8db94df249
Reviewed-on: https://go-review.googlesource.com/c/go/+/353569
Trust: Cherry Mui <cherryyz@google.com>
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runtime.no_pointers_stackmap is an odd beast.
It is defined in a Go file, populated by assembly,
used by the GC, and its address is magic used
by async pre-emption to ascertain whether a
routine was implemented in assembly.
A subsequent change will force all GC data into the go.func.* linker symbol.
runtime.no_pointers_stackmap is GC data, so it must go there.
Yet it also needs to go into rodata, for the runtime address trick.
This change eliminates it entirely.
Replace the runtime address check with the newly introduced asm funcflag.
Handle the assembly macro as magic, similarly to our handling of go_args_stackmap.
This allows the no_pointers_stackmap to be identical in all ways
to other gclocals stackmaps, including content-addressability.
Change-Id: Id2f20a262cfab0719beb88e6342984ec4b196268
Reviewed-on: https://go-review.googlesource.com/c/go/+/353672
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
It'll be used in second place in a subsequent change.
No functional changes.
Change-Id: I58dd12d7dde45b36995d031fc7fbb27d6eaf48d3
Reviewed-on: https://go-review.googlesource.com/c/go/+/353670
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Trust: David Crawshaw <crawshaw@golang.org>
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There's no good way to ascertain at runtime whether
a function was implemented in assembly.
The existing workaround doesn't play nicely
with some upcoming linker changes.
This change introduces an explicit marker for routines
implemented in assembly.
This change doesn't use the new bit anywhere,
it only introduces it.
Change-Id: I4051dc0afc15b260724a04b9d18aeeb94911bb29
Reviewed-on: https://go-review.googlesource.com/c/go/+/353671
Trust: Josh Bleecher Snyder <josharian@gmail.com>
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Reviewed-by: Cherry Mui <cherryyz@google.com>
Also move the logic of setting arginfo symbols content-addressable
to the place of symbol creation.
Change-Id: Ia5c3d77b1cec988c42c84d573170120948575c07
Reviewed-on: https://go-review.googlesource.com/c/go/+/353830
Trust: Cherry Mui <cherryyz@google.com>
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This change preserves the observable invariant that for an *ast.CallExpr
'call', Info.Types[call.Fun] is the signature being called.
Updates #47916
Change-Id: I3e97c712a7ee33a4f29e8cf4c18dc7c946b66cc9
Reviewed-on: https://go-review.googlesource.com/c/go/+/353831
Trust: Robert Findley <rfindley@google.com>
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Go exchanges siginfo and sigevent structures with the kernel. They
contain unions, but Go's use is limited to the first few fields. Pad out
the rest so the size Go sees is the same as what the Linux kernel sees.
This is a follow-up to CL 342052 which added the sigevent struct without
padding. It updates the siginfo struct as well so there are no bad
examples in the defs_linux_*.go files.
Change-Id: Id991d4a57826677dd7e6cc30ad113fa3b321cddf
Reviewed-on: https://go-review.googlesource.com/c/go/+/353136
Run-TryBot: Rhys Hiltner <rhys@justin.tv>
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Trust: Michael Knyszek <mknyszek@google.com>
This change updates the log lines to clarify that the printed
interesting count is only for newly discovered cache entries, and prints
the total cache size. It only prints information about interesting
entries when coverageEnabled is true.
Fixes#48669
Change-Id: I2045afc204764c1842d323e8ae42016fb21b6fb7
Reviewed-on: https://go-review.googlesource.com/c/go/+/353172
Trust: Michael Knyszek <mknyszek@google.com>
Trust: Katie Hockman <katie@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Run-TryBot: Katie Hockman <katie@golang.org>
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Otherwise the type checker defaults to amd64, which can break
type-checking for definitions using unsafe.Sizeof.
This has the side effect of changing the API output: constants with
different values across architectures (e.g., MaxInt) are now
individually listed per-arch. This actually makes the API file more
accurate, but does introduce a one-time discontinuity. These changes
have been integrated into the API files where the constants were added.
Change-Id: I4bbb0b7a7f405d3adda2d83869475c8bacdeb6a9
Reviewed-on: https://go-review.googlesource.com/c/go/+/353331
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
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Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
I've manually reviewed all uses of ctxt.Flag_shared for concurrency safety.
And I manually tested with the race detector and found no issues.
Allow -shared to be used with compiler concurrency,
thereby re-enabling concurrent compilation on darwin/arm64.
Fixes#48496
Change-Id: I8a084cb08e6050950e404ceb9bd7e3a20e07e9c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/353871
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Add GoPathError variable. This variable gets set when GOPATH is not
set in the environment and in build.Default.GOPATH. GoPathError may
be used in "GOPATH unset" error messages to explain why GOPATH is not
set.
This CL improves upon CL 158257.
Fixes#29341
Change-Id: Ib42b42fb442c8297d58da4ca556be55e21a034e1
Reviewed-on: https://go-review.googlesource.com/c/go/+/331529
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
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Trust: Michael Knyszek <mknyszek@google.com>
Remove the Interface.IsConstraint, Signature.SetTypeParams, and
Signature.SetRecvTypeParams methods, as they have been replaced and
usage removed from x/tools.
Change-Id: I8786c3cf34e96ab5211cd8e7e6348e9ee792b843
Reviewed-on: https://go-review.googlesource.com/c/go/+/353570
Trust: Robert Findley <rfindley@google.com>
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This changes a rule in PPC64.rules to fix a failure in
test/issue45344.go when regabi is enabled.
Change-Id: I98baf2ae92c766b7276b0f3167b2e6fef37dfe84
Reviewed-on: https://go-review.googlesource.com/c/go/+/353789
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
CALL and JMP on riscv64 are currently implemented as an AUIPC+JALR pair. This means
that every call requires two instructions and makes use of the REG_TMP register,
even when the symbol would be directly reachable via a single JAL instruction.
Add support for call trampolines - CALL and JMP are now implemented as a single JAL
instruction, with the linker generating trampolines in the case where the symbol is
not reachable (more than +/-1MiB from the JAL instruction), is an unknown symbol or
does not yet have an address assigned. Each trampoline contains an AUIPC+JALR pair,
which the relocation is applied to.
Due to the limited reachability of the JAL instruction, combined with the way that
the Go linker currently assigns symbol addresses, there are cases where a call is to
a symbol that has no address currently assigned. In this situation we have to assume
that a trampoline will be required, however we can patch this up during relocation,
potentially calling directly instead. This means that we will end up with trampolines
that are unused. In the case of the Go binary, there are around 3,500 trampolines of
which approximately 2,300 are unused (around 9200 bytes of machine instructions).
Overall, this removes over 72,000 AUIPC instructions from the Go binary.
Change-Id: I2d9ecfb85dfc285c7729a3cd0b3a77b6f6c98be0
Reviewed-on: https://go-review.googlesource.com/c/go/+/345051
Trust: Joel Sing <joel@sing.id.au>
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The golang.org/x/net/route package can't parse the RIB returned
by NET_RT_IFLISTL. Use the route.RIBTypeInterface constant
instead, leaving the choice of syscall up to the route package.
Fixes#48553.
Change-Id: Ida4bd6e332c0dc6dc871d3a93cfb56c0fbc93e1b
Reviewed-on: https://go-review.googlesource.com/c/go/+/353611
Trust: Damien Neil <dneil@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Change-Id: Icabef5cf75770ffde012b1fc785a72f53f9b2c46
Reviewed-on: https://go-review.googlesource.com/c/go/+/353669
Trust: Robert Griesemer <gri@golang.org>
Trust: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Robert Griesemer <gri@golang.org>
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Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Now that gofmt knows how to format many files in parallel,
there's no need for "go fmt" to have its own parallelism.
Instead of running "gofmt -l -w $file" in parallel with GOMAXPROCS,
simply collect a large list of files and hand it to "gofmt -l -w $files".
The benchmark below was obtained via:
benchcmd -n 10 FmtGorootCmd go fmt cmd
We can see a drastic improvement in system time per call.
This makes sense, as we used to fork+exec one gofmt program per file,
and now we only do that for every thousand or so files.
We also see an increase in peak memory usage and user CPU time.
This seems to be because each gofmt process was very short lived before.
This meant that there was a limit to the total amount of allocations
produced by go/parser and go/printer before the process stopped,
and thus the GC probably didn't kick in most of the time.
Now that each gofmt process formats hundreds or thousands of files,
a lot of those allocations pile up in the same process,
making peak-RSS go higher and piling on garbage for the GC to clean up.
Finally, note that time/op seems largely unchanged.
I did many benchmark runs; some ended up in noise like the one below,
and others gave small wall time speed-ups of 3-4%.
It seems like we get very little wall time benefit,
possibly due to the factors mentioned earlier cancelling each other out.
Overall, it seems worthwhile to not let "go fmt" do its own parallelism,
to keep the tool simpler to understand and maintain going forward.
Plus, the sys-time savings do seem to be the biggest change here.
name old time/op new time/op delta
FmtGorootCmd 850ms ± 4% 842ms ± 6% ~ (p=0.529 n=10+10)
name old user-time/op new user-time/op delta
FmtGorootCmd 7.30s ± 4% 7.67s ± 3% +5.07% (p=0.000 n=10+10)
name old sys-time/op new sys-time/op delta
FmtGorootCmd 1.66s ± 7% 0.43s ±24% -74.08% (p=0.000 n=10+10)
name old peak-RSS-bytes new peak-RSS-bytes delta
FmtGorootCmd 30.1MB ± 4% 199.4MB ±21% +563.03% (p=0.000 n=10+10)
To make use of the already-present "maximum exec arg length limit"
constant in cmd/go/internal, move it to cmd/internal.
Fixes#43566.
Change-Id: If864151d0c851a40bf7138f9864640f15a066d48
Reviewed-on: https://go-review.googlesource.com/c/go/+/353309
Trust: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
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The "curl" binary is already used at several other places inside
the code base, whereas this was the only occurrence of "wget".
Change-Id: I2b9c5c353d08b3ba8289819b4a602c51f1ebd593
GitHub-Last-Rev: abf9485522
GitHub-Pull-Request: golang/go#48718
Reviewed-on: https://go-review.googlesource.com/c/go/+/353401
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Cherry Mui <cherryyz@google.com>
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Previously if we failed because the context timed out or was canceled,
we returned errCanceled or errTimeout.
Fixes#39178
Change-Id: I11bd7ebfaa7e5775fb05dfbb6b67f8307c8d8697
Reviewed-on: https://go-review.googlesource.com/c/go/+/353400
Trust: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Damien Neil <dneil@google.com>
For #31103
Change-Id: I9c0aa64f95f564de31a4c178e3930584d41316bb
Reviewed-on: https://go-review.googlesource.com/c/go/+/353610
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In types1 and for the export format, we were using type param subscripts
coming from types2 (originally for debugging) to provide unique names.
We need unique full-names for type params in types1 to ensure consistent
references to type params in function/method bodies and type params
derived from translation from types2. We also currently need unique
names for type params in importer/iimport.go and gcimporter/iimport.go,
because there are no levels of scoping in the package symbol lookup and
pkgIndex table.
As a step to eliminate the typeparam subscripts (which have no
relation to the source code), we change so that the typeparams' unique
name is just prefixing the type param name with the name of the
enclosing generic function, type, or method.
We now no longer use types2.TypeString in types2-to-types1 translation,
so Typestring can be changed to eliminate the subscript, as needed.
Also, types2.TypeParam.SetId() is no longer needed and is eliminated.
We can decide later if we want to do the further step of adding scoping
to the importer/iimport.go and gcimporter/iimport.go, which could be
used to eliminate the type param "path" prefix from the export format.
Change-Id: I0e37795664be2c2e1869b8f9e93393b83fc56409
Reviewed-on: https://go-review.googlesource.com/c/go/+/353135
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Dan Scales <danscales@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Discard is not really a read operation, and in theory it could
Seek the underlying Reader without actually reading anything,
so an UnreadByte following a Discard is disallowed.
Similarly, although WriteTo usually does end up calling Read on the
underlying buffer, if the underlying Reader implements io.WriterTo it
may instead terminate in a call to WriteTo, without ever buffering or
even seeing the last byte written. (It is conceptually read-like, but
not strictly “a read operation”.)
Fixes#48446
Change-Id: Ide6f2b157332b423486810399f66140c914144e5
Reviewed-on: https://go-review.googlesource.com/c/go/+/351810
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Joe Tsai <joetsai@digital-static.net>
Reviewed-by: Joe Tsai <joetsai@digital-static.net>
Provide an accessor for clients, and don't print the interface
around implicitly wrapped embedded types.
For #48424.
Change-Id: Ib2c76315508fc749ea4337d52e13d17de80e04da
Reviewed-on: https://go-review.googlesource.com/c/go/+/353396
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
This change enables the relaxed syntax for constraint literals
as proposed in issue #48424 and adds a simple smoke test for
the compiler. (Most of the relevant changes are in the syntax
and types2 package which have more extensive tests for this.)
This makes it possible to experiment with the new syntax while
we contemplate the fate of #48424.
If #48424 is accepted, this change can remain. If #48424 is
not accepted, reverting this CL will remove this feature in
the compiler.
For #48424.
Change-Id: I624fbb37c2f616ee9ad692e17e4fc75c9d5b06e5
Reviewed-on: https://go-review.googlesource.com/c/go/+/353389
Trust: Robert Griesemer <gri@golang.org>
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Dan Scales <danscales@google.com>
When collecting type parameters, wrap constraint literals of the
form ~T or A|B into interfaces so the type checker doesn't have
to deal with these type set expressions syntactically anywhere
else but in interfaces (i.e., union types continue to appear
only as embedded elements in interfaces).
Since a type constraint doesn't need to be an interface anymore,
we can remove the respective restriction. Instead, when accessing
the constraint interface via TypeParam.iface, wrap non-interface
constraints at that point and update the constraint so it happens
only once. By computing the types sets of all type parameters at
before the end of type-checking, we ensure that type constraints
are in their final form when accessed through the API.
For #48424.
Change-Id: I3a47a644ad4ab20f91d93ee39fcf3214bb5a81f9
Reviewed-on: https://go-review.googlesource.com/c/go/+/353139
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
This CL permits an arbitrary type as well as the type sets ~T and A|B
in constraint position, without the need of a surrrounding interface.
For instance, the type parameter list
[P interface{ ~map[K]V }, K comparable, V interface{ ~string }]
may be written as
[P ~map[K]V, K comparable, V ~string]
The feature must be enabled explicitly with the AllowTypeSets mode
and is only available if AllowGenerics is set as well.
For #48424.
Change-Id: Ic70bb97a49ff75e67e040853eac10e6aed0fef1a
Reviewed-on: https://go-review.googlesource.com/c/go/+/353133
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
Change-Id: Id53633477d1c07bce0c5fcbcab079da51076cdf2
Reviewed-on: https://go-review.googlesource.com/c/go/+/353351
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
