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Change-Id: Ie8d74d0968c3dfa6fe3454f1d3fdf13d6a6a6944
Reviewed-on: https://go-review.googlesource.com/c/go/+/760162
Auto-Submit: Mateusz Poliwczak <mpoliwczak34@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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Fixes #78404
Change-Id: I6adc1fb42ad6a3acce21333c6819d0796a6a6964
Reviewed-on: https://go-review.googlesource.com/c/go/+/760161
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
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Change-Id: I4f5a89f452a252018072d067da4cdb9a6cb0f4fe
GitHub-Last-Rev: 7eb108d3878109ccb9846d97b2adc7ea3003772a
GitHub-Pull-Request: golang/go#76396
Reviewed-on: https://go-review.googlesource.com/c/go/+/722860
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Robert Griesemer <gri@google.com>
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We do not lookup/devirtualize such, so we can skip tracking them.
Change-Id: I8bdb0b11c694e4b2326c236093508a356a6a6964
Reviewed-on: https://go-review.googlesource.com/c/go/+/711160
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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Reviewed-by: Keith Randall <khr@google.com>
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Change-Id: I5e9e9c89336446720c3c21347969e4126a6a6964
Reviewed-on: https://go-review.googlesource.com/c/go/+/711140
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
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Fixes #75863
Change-Id: I1e5a0f3880dcd5f820a5b6f4540c49b16a6a6964
Reviewed-on: https://go-review.googlesource.com/c/go/+/711141
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Lasse Folger <lassefolger@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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This change improves the concrete type analysis in the devirtualizer,
it not longer relies on ir.Reassigned, it now statically tries to
determine the concrete type of an interface, even when assigned
multiple times, following type assertions and iface conversions.
Alternative to CL 649195
Updates #69521
Fixes #64824
Change-Id: Ib1656e19f3619ab2e1e6b2c78346cc320490b2af
GitHub-Last-Rev: e8fa0b12f0a7b1d7ae00e5edb54ce04d1f702c09
GitHub-Pull-Request: golang/go#71935
Reviewed-on: https://go-review.googlesource.com/c/go/+/652036
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
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Auto-Submit: Keith Randall <khr@golang.org>
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Change-Id: Id991ec0826a4e2857f00330b4b7ff2b71907b789
Reviewed-on: https://go-review.googlesource.com/c/go/+/606615
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
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Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Commit-Queue: Ian Lance Taylor <iant@google.com>
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This CL interleaves devirtualization and inlining, so that
devirtualized calls can be inlined.
Fixes #52193.
Change-Id: I681e7c55bdb90ebf6df315d334e7a58f05110d9c
Reviewed-on: https://go-review.googlesource.com/c/go/+/528321
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Bypass: Matthew Dempsky <mdempsky@google.com>
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Change-Id: I179b50ae8e73677d4d408b83424afbbfe6aa17a1
GitHub-Last-Rev: 2e2d9c1e45556155d02db4df381b99f2d1bc5c0e
GitHub-Pull-Request: golang/go#63478
Reviewed-on: https://go-review.googlesource.com/c/go/+/534015
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
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The devirtualizer and inliner both want to recognize call expressions
that are part of a go or defer statement. This CL refactors them to
use a single CallExpr.GoDefer flag, which gets set during
normalization of go/defer statements during typecheck.
While here, drop some OCALLMETH assertions. Typecheck has been
responsible for desugaring them into OCALLFUNC for a while now, and
ssagen will check this again for us later anyway.
Change-Id: I3fc370f4417431aae97239313da6fe523f512a2e
Reviewed-on: https://go-review.googlesource.com/c/go/+/543657
Reviewed-by: Than McIntosh <thanm@google.com>
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Auto-Submit: Matthew Dempsky <mdempsky@google.com>
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CallExpr.X -> CallExpr.Fun
This consistent with go/ast and cmd/compile/internal/syntax.
OPRINTN -> OPRINTLN
This op represents the "println" builtin; might as well spell it the
same way.
Change-Id: Iead1b007776658c717879cf0997b3c48028428f4
Reviewed-on: https://go-review.googlesource.com/c/go/+/532795
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
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Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
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This CL removes a lot of the redundant methods for accessing struct
fields and signature parameters. In particular, users never have to
write ".Slice()" or ".FieldSlice()" anymore; the exported APIs just do
what you want.
Further internal refactorings to follow.
Change-Id: I45212f6772fe16aad39d0e68b82d71b0796e5639
Reviewed-on: https://go-review.googlesource.com/c/go/+/521295
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
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Separate CL in case I'm mistaken.
Change-Id: I6b5fa0efb27a6b4fb4c133698bd7e2f01b4cccdb
Reviewed-on: https://go-review.googlesource.com/c/go/+/521195
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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This CL refactors common patterns for constructing field and method
selector expressions. Notably, XDotField and XDotMethod are now the
only two functions where a SelecterExpr with OXDOT is constructed.
Change-Id: I4c087225d8b295c4a6a92281ffcbcabafe2dc94d
Reviewed-on: https://go-review.googlesource.com/c/go/+/520979
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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Ran gofmt on a couple of Go source files that needed it.
Change-Id: I0e9f78831f531a728b892a63c6e0c517d92b11a8
Reviewed-on: https://go-review.googlesource.com/c/go/+/507156
Run-TryBot: Than McIntosh <thanm@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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This CL is originally based on CL 484838 from rajbarik@uber.com.
Add a new PGO-based devirtualize pass. This pass conditionally
devirtualizes interface calls for the hottest callee. That is, it
performs a transformation like:
type Iface interface {
Foo()
}
type Concrete struct{}
func (Concrete) Foo() {}
func foo(i Iface) {
i.Foo()
}
to:
func foo(i Iface) {
if c, ok := i.(Concrete); ok {
c.Foo()
} else {
i.Foo()
}
}
The primary benefit of this transformation is enabling inlining of the
direct calls.
Today this change has no impact on the escape behavior, as the fallback
interface always forces an escape. But improving escape analysis to take
advantage of this is an area of potential work.
This CL is the bare minimum of a devirtualization implementation. There
are still numerous limitations:
* Callees not directly referenced in the current package can be missed
(even if they are in the transitive dependences).
* Callees not in the transitive dependencies of the current package are
missed.
* Only interface method calls are supported, not other indirect function
calls.
* Multiple calls to compatible interfaces on the same line cannot be
distinguished and will use the same callee target.
* Callees that only partially implement an interface (they are embedded
in another type that completes the interface) cannot be devirtualized.
* Others, mentioned in TODOs.
Fixes #59959
Change-Id: I8bedb516139695ee4069650b099d05957b7ce5ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/492436
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
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This CL removes the GOEXPERIMENT=nounified knob, and any conditional
statements that depend on that knob. Further CLs to remove unreachable
code follow this one.
Updates #57410.
Change-Id: I39c147e1a83601c73f8316a001705778fee64a91
Reviewed-on: https://go-review.googlesource.com/c/go/+/458615
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Devirtualization can turn OCALLINTER into OCALLMETH, but then we want
to actually desugar into OCALLFUNC instead for later phases. Just
needs a missing call to typecheck.FixMethodCall.
Fixes #57309.
Change-Id: I331fbd40804e1a370134ef17fa6dd501c0920ed3
Reviewed-on: https://go-review.googlesource.com/c/go/+/457715
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
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For defer/go calls, the function/method value are evaluated immediately.
So after devirtualizing, it may trigger a panic when implicitly deref
a nil pointer receiver, causing the program behaves unexpectedly.
It's safer to not devirtualizing defer/go calls at all.
Fixes #52072
Change-Id: I562c2860e3e577b36387dc0a12ae5077bc0766bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/428495
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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As a consistency check in devirtualization, when we determine `i` (of
interface type `I`) always has dynamic type `T`, we insert a type
assertion `i.(T)`. This emits an itab check for `go:itab.T,I`, but
it's always true (and so SSA optimizes it away).
However, if `I` is instead the generic interface type `I[T]`, then
`go:itab.T,I[int]` and `go:itab.T,I[go.shape.int]` are equivalent but
distinct itabs. And notably, we'll have originally created the
interface value using the former; but the (non-dynamic) TypeAssertExpr
created by devirtualization would ultimately emit a comparison against
the latter. This comparison would then evaluate false, leading to a
spurious type assertion panic at runtime.
The comparison is just meant as an extra safety check, so it should be
safe to just disable. But for now, it's simpler/safer to just punt on
devirtualization in this case. (The non-unified frontend doesn't
devirtualize this either.)
Change-Id: I6a8809bcfebc9571f32e289fa4bc6a8b0d21ca46
Reviewed-on: https://go-review.googlesource.com/c/go/+/424774
Reviewed-by: Keith Randall <khr@golang.org>
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This CL switches unified IR to use shape-based stenciling with runtime
dictionaries, like the existing non-unified frontend. Specifically,
when instantiating generic functions and types `X[T]`, we now also
instantiated shaped variants `X[shapify(T)]` that can be shared by
`T`'s with common underlying types.
For example, for generic function `F`, `F[int](args...)` will be
rewritten to `F[go.shape.int](&.dict.F[int], args...)`.
For generic type `T` with method `M` and value `t` of type `T[int]`,
`t.M(args...)` will be rewritten to `T[go.shape.int].M(t,
&.dict.T[int], args...)`.
Two notable distinctions from the non-unified frontend:
1. For simplicity, currently shaping is limited to simply converting
type arguments to their underlying type. Subsequent CLs will implement
more aggressive shaping.
2. For generic types, a single dictionary is generated to be shared by
all methods, rather than separate dictionaries for each method. I
originally went with this design because I have an idea of changing
interface calls to pass the itab pointer via the closure
register (which should have zero overhead), and then the interface
wrappers for generic methods could use the *runtime.itab to find the
runtime dictionary that corresponds to the dynamic type. This would
allow emitting fewer method wrappers.
However, this choice does have the consequence that currently even if
a method is unused and its code is pruned by the linker, it may have
produced runtime dictionary entries that need to be kept alive anyway.
I'm open to changing this to generate per-method dictionaries, though
this would require changing the unified IR export data format; so it
would be best to make this decision before Go 1.20.
The other option is making the linker smarter about pruning unneeded
dictionary entries, like how it already prunes itab entries. For
example, the runtime dictionary for `T[int]` could have a `R_DICTTYPE`
meta-relocation against symbol `.dicttype.T[go.shape.int]` that
declares it's a dictionary associated with that type; and then each
method on `T[go.shape.T]` could have `R_DICTUSE` meta-relocations
against `.dicttype.T[go.shape.T]+offset` indicating which fields
within dictionaries of that type need to be preserved.
Change-Id: I369580b1d93d19640a4b5ecada4f6231adcce3fd
Reviewed-on: https://go-review.googlesource.com/c/go/+/421821
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
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Change-Id: I8e319f55fad6e9ed857aa020a96f3a89ccaadcea
Reviewed-on: https://go-review.googlesource.com/c/go/+/280213
Trust: Matthew Dempsky <mdempsky@google.com>
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The devirtualization code was only in inl.go because it reused some of
the same helper functions as inlining (notably staticValue), but that
code all ended up in package ir instead anyway. Beyond that minor
commonality, it's entirely separate from inlining.
It's definitely on the small side, but consistent with the new
micropass-as-a-package approach we're trying.
[git-generate]
cd src/cmd/compile/internal/inline
rf '
mv Devirtualize Func
mv devirtualizeCall Call
mv Func Call devirtualize.go
mv devirtualize.go cmd/compile/internal/devirtualize
'
Change-Id: Iff7b9fe486856660a8107d5391c54b7e8d238706
Reviewed-on: https://go-review.googlesource.com/c/go/+/280212
Trust: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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