User code is unlikely to be correct, but don't crash the compiler
when the offset of a pointer in an object is not a multiple of the
pointer size.
Fixes#61187
Change-Id: Ie56bfcb38556c5dd6f702ae4ec1d4534c6acd420
Reviewed-on: https://go-review.googlesource.com/c/go/+/508555
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The large-function phi placement algorithm evidently doesn't like the
same pseudo-variable being used to represent expressions of varying
types.
Instead, use the same tactic as used for "valVar" (ssa.go:6585--6587),
which is to just generate a fresh marker node each time.
Maybe we could just use the OMIN/OMAX nodes themselves as the key
(like we do for OANDAND/OOROR), but that just seems needlessly risky
for negligible memory savings. Using fresh marker values each time
seems obviously safe by comparison.
Fixes#61041.
Change-Id: Ie2600c9c37b599c2e26ae01f5f8a433025d7fd08
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For float or string, min/max builtin performs a runtime call, so we need
to save its result to temporary variable. Otherwise, the runtime call
will clobber closure's arguments currently on the stack when passing
min/max as argument to closures.
Fixes#60990
Change-Id: I1397800f815ec7853182868678d0f760b22afff2
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Our large-function phi placement algorithm is incompatible with phi
opcodes already existing in the SSA representation. Instead, use simple
variable assignments and have the phi placement algorithm place the phis
we need for min/max.
Turns out the small-function phi placement algorithm doesn't have this
sensitivity, so this bug only occurs in large functions (>500 basic blocks).
Maybe we should document/check that no phis are present when we start
phi placement (regardless of size). Leaving for a potential separate CL.
We should probably also fix the placement algorithm to handle existing
phis correctly. But this CL is probably a lot smaller/safer than
messing with phi placement.
Fixes#60982
Change-Id: I59ba7f506c72b22bc1485099a335d96315ebef67
Reviewed-on: https://go-review.googlesource.com/c/go/+/505756
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CL 410344 fixed missing method value wrapper, by visiting body of
wrapper function after applying inlining pass.
CL 492017 allow more inlining of functions that construct closures,
which ends up making the wrapper function now inlineable, but can
contain closure nodes that couldn't be inlined. These closures body may
contain OMETHVALUE nodes that we never seen, thus we need to scan
closures body for finding them.
Fixes#60945
Change-Id: Ia1e31420bb172ff87d7321d2da2989ef23e6ebb6
Reviewed-on: https://go-review.googlesource.com/c/go/+/505255
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Change-Id: Idd872c5b90dbca564ed8a37bb3683e642142ae63
Reviewed-on: https://go-review.googlesource.com/c/go/+/505015
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types2 have already errored about any spec-required overflows, and
division by zero. CL 469595 unintentionally fixed typecheck not to error
about overflows, but zero division is still be checked during tcArith.
This causes unsafe operations with variable size failed to compile,
instead of raising runtime error.
Fixes#60601
Change-Id: I7bea2821099556835c920713397f7c5d8a4025ac
Reviewed-on: https://go-review.googlesource.com/c/go/+/501735
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CL 496257 adds min/max builtins, which may appear as argument to a
function call, so it will be tested by mayCall. But those ops are not
handled by mayCall, causes the compiler crashes.
Fixes#60582
Change-Id: I729f10bf62b4aad39ffcb1433f576e74d09fdd9a
Reviewed-on: https://go-review.googlesource.com/c/go/+/500575
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HAUTO should be handled the same way as other stack offsets for
adding to constant pool. Add the missing cases.
Fixes#57955.
Change-Id: If7fc82cafb2bbf0a6121e73e353b8825cb36b5bc
Reviewed-on: https://go-review.googlesource.com/c/go/+/463138
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Some testdir tests fail if GOEXPERIMENT=cgocheck2 is set. Fix this by
skipping these tests.
Change-Id: I58d4ef0cceb86bcf93220b4a44de9b9dc4879b16
Reviewed-on: https://go-review.googlesource.com/c/go/+/499675
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Two interface types that are assignable don't have to be identical;
specifically, if they are defined types, they can be different
defined types. If those defined types specify type parameters which
are never used, do not infer a type argument based on the instantiation
of a matching defined type.
Adjusted three existing tests where we inferred type arguments incorrectly.
Fixes#60377.
Change-Id: I91fb207235424b3cbc42b5fd93eee619e7541cb7
Reviewed-on: https://go-review.googlesource.com/c/go/+/498315
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This enables the implementation for proposal #58671, which is
a likely accept. By enabling it early we get a bit extra soak
time for this feature. The change can be reverted trivially, if
need be.
For #58671.
Change-Id: Id6c27515e45ff79f4f1d2fc1706f3f672ccdd1ab
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If the function referenced by a closure expression is incorporated
into a static init, be sure to mark it as non-hidden, since otherwise
it will be live but no longer reachable from the init func, hence it
will be skipped during escape analysis, which can lead to
miscompilations.
Fixes#59680.
Change-Id: Ib858aee296efcc0b7655d25c23ab8a6a8dbdc5f9
Reviewed-on: https://go-review.googlesource.com/c/go/+/492135
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[This is a roll-forward of CL 484859, this time including a fix for
issue #59709. The call to do dead function marking was taking place in
the wrong spot, causing it to run more than once if generics were
instantiated.]
This patch generalizes the code in the inliner that marks unreferenced
hidden closure functions as dead. Rather than doing the marking on the
fly (previous approach), this new approach does a single pass at the
end of inlining, which catches more dead functions.
Change-Id: I0e079ad755c21295477201acbd7e1a732a98fffd
Reviewed-on: https://go-review.googlesource.com/c/go/+/492016
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Previously, type arguments could only be inferred for generic
functions in call expressions, whereas with the reverse type inference
proposal they can now be inferred in assignment contexts too. As a
consequence, we now need to check Info.Instances to find the inferred
type for more cases now.
Updates #59338.
Fixes#59955.
Change-Id: I9b6465395869459c2387d0424febe7337b28b90e
Reviewed-on: https://go-review.googlesource.com/c/go/+/492455
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Marking variables in erroneous variable declarations as used is
convenient for tests but doesn't necessarily hide follow-on errors
in real code: either the variable is not supposed to be declared in
the first place and then we should get an error if it is not used,
or it is there because it is intended to be used, and the we expect
an error it if is not used.
This brings types2 closer to go/types.
Change-Id: If7ee1298fc770f7ad0cefe7e968533fd50ec2343
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This reverts commit http://go.dev/cl//484859
Reason for revert: causes linker errors in a number of google-internal tests.
Change-Id: I322252f784a46d2b1d447ebcdca86ce14bc0cc91
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This patch generalizes the code in the inliner that marks unreferenced
hidden closure functions as dead. Rather than doing the marking on the
fly (previous approach), this new approach does a single pass at the
end of inlining, which catches more dead functions.
Fixes#59638.
Updates #59404.
Updates #59547.
Change-Id: I54fd63e9e37c9123b08a3e7def7d1989919bba91
Reviewed-on: https://go-review.googlesource.com/c/go/+/484859
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Static init inliner is using typecheck.EvalConst to handle string
concatenation expressions. But static init inliner may reveal constant
expressions after substitution, and the compiler needs to evaluate those
expressions in non-constant semantic. Using typecheck.EvalConst, which
always evaluates expressions in constant semantic, is not the right
choice.
For safety, this CL fold the logic to handle string concatenation to
static init inliner, so there won't be regression in handling constant
expressions in non-constant semantic. And also, future CL can simplify
typecheck.EvalConst logic.
Updates #58293
Updates #58339Fixes#58439
Change-Id: I74068d99c245938e576afe9460cbd2b39677bbff
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(This is a retry of CL 462035 which was reverted at 474976.
The only change from that CL is the aix fix SRODATA->SNOPTRDATA
at inittask.go:141)
As described here:
https://github.com/golang/go/issues/31636#issuecomment-493271830
"Find the lexically earliest package that is not initialized yet,
but has had all its dependencies initialized, initialize that package,
and repeat."
Simplify the runtime a bit, by just computing the ordering required
in the linker and giving a list to the runtime.
Update #31636Fixes#57411
RELNOTE=yes
Change-Id: I28c09451d6aa677d7394c179d23c2c02c503fc56
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Range statement will mutate the key and value, so we should treat them as reassigned.
Fixes#59572
Change-Id: I9c6b67d938760a0c6a1d9739f2737c67af4a3a10
Reviewed-on: https://go-review.googlesource.com/c/go/+/483855
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Fixes#58141
Co-authored-by: Richard Musiol <neelance@gmail.com>
Co-authored-by: Achille Roussel <achille.roussel@gmail.com>
Co-authored-by: Julien Fabre <ju.pryz@gmail.com>
Co-authored-by: Evan Phoenix <evan@phx.io>
Change-Id: I49b66946acc90fdf09ed9223096bfec9a1e5b923
Reviewed-on: https://go-review.googlesource.com/c/go/+/479627
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So iterators that are in progress can know entries have been deleted and
terminate the iterator properly.
Update #55002
Update #56351Fixes#59411
Change-Id: I924f16a00fe4ed6564f730a677348a6011d3fb67
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Use the type of the store for the byteswap, not the type of the
store's value argument.
Normally when we're storing a 16-bit value, the value being stored is
also typed as 16 bits. But sometimes it is typed as something smaller,
usually because it is the result of an upcast from a smaller value,
and that upcast needs no instructions.
If the type of the store's arg is thinner than the type being stored,
and the byteswap'd value uses that thinner type, and the byteswap'd
value needs to be spilled & restored, that spill/restore happens using
the thinner type, which causes us to lose some of the top bits of the
value.
Fixes#59367
Change-Id: If6ce1e8a76f18bf8e9d79871b6caa438bc3cce4d
Reviewed-on: https://go-review.googlesource.com/c/go/+/481395
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When a closure is inlined, it may contain other hidden closures, which
the inliner will duplicate, rendering the original nested closures as
unreachable. Because they are unreachable, they don't get processed in
escape analysis, meaning that go/defer statements don't get rewritten,
which can then in turn trigger errors in walk. This patch looks for
nested hidden closures and marks them as dead, so that they can be
skipped later on in the compilation flow. NB: if during escape
analysis we rediscover a hidden closure (due to an explicit reference)
that was previously marked dead, revive it at that point.
Fixes#59404.
Change-Id: I76db1e9cf1ee38bd1147aeae823f916dbbbf081b
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Unified IR already records the correct type for them.
Fixes#59378
Change-Id: I275c45b48f67bde55c8e2079d60b5868d0acde7f
Reviewed-on: https://go-review.googlesource.com/c/go/+/481555
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Casting to a *uintptr is not ok if there isn't at least 8 bytes of
data backing that pointer (on 64-bit archs).
So although we end up making a slice of 0 length with that pointer,
the cast itself doesn't know that.
Instead, bail early if the result is going to be 0 length.
Fixes#59334
Change-Id: Id3c0e09d341d838835c0382cccfb0f71dc3dc7e6
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Change the Checker.use/useLHS functions to report if all "used"
expressions evaluated without error. Use that information to
control whether to report an assignment mismatch error or not.
This will reduce the number of errors reported per assignment,
where the assignment mismatch is only one of the errors.
Change-Id: Ia0fc3203253b002e4e1d5759d8d5644999af6884
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For #55242
Change-Id: I092b1881623ea997b178d038c0afd10cd5bca937
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unsafe.SliceData can return pointers which are nil. That function gets
lowered to the SSA OpSlicePtr, which the compiler assumes is non-nil.
This used to be the case as OpSlicePtr was only used in situations
where the bounds check already passed. But with unsafe.SliceData that
is no longer the case.
There are situations where we know it is nil. Use Bounded() to
indicate that.
I looked through all the uses of OSPTR and added SetBounded where it
made sense. Most OSPTR results are passed directly to runtime calls
(e.g. memmove), so even if we know they are non-nil that info isn't
helpful.
Fixes#59293
Change-Id: I437a15330db48e0082acfb1f89caf8c56723fc51
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As with changes in prior CLs, we don't suppress legitimate
"declared but not used" errors anymore simply because the
respective variables are used in incorrect assignments,
unrelated to the variables in question.
Adjust several (ancient) tests accordingly.
Change-Id: I5826393264d9d8085c64777a330d4efeb735dd2d
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This CL re-introduces useLHS because we don't want to suppress
correct "declared but not used" errors for variables that only
appear on the LHS of an assignment (using Checker.use would mark
them as used).
This CL also adjusts a couple of places where types2 differed
from go/types (and suppressed valid "declared and not used"
errors). Now those errors are surfaced. Adjusted a handful of
tests accordingly.
Change-Id: Ia555139a05049887aeeec9e5221b1f41432c1a57
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Don't say "array length must be integer" if it is in fact an integer.
Fixes#59209
Change-Id: If60b93a0418f5837ac334412d3838eec25eeb855
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In the Sizes API, recognize an overflow (to a negative value) as a
consequence of an oversize value, and specify as such in the API.
Adjust the various size computations to take overflow into account.
Recognize a negative size or offset as an error and report it rather
than panicking.
Use the same protocol for results provided by the default (StdSizes)
and external Sizes implementations.
Add a new error code TypeTooLarge for the new errors.
Fixes#59190.
Fixes#59207.
Change-Id: I8c33a9e69932760275100112dde627289ac7695b
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For #59169
Change-Id: Id72ad9fe8b6e1d7cf64f972520ae8858f70c025a
Reviewed-on: https://go-review.googlesource.com/c/go/+/478217
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
This reverts commit ce2a609909.
aka CL 462035
Reason for revert: this CL is causing some problems in some internal Google programs.
Change-Id: I4476b8d8d2c3d7b5703d1d85c93baebb4b4e5d26
Reviewed-on: https://go-review.googlesource.com/c/go/+/474976
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
On ARM64, in -dynlink mode (building a shared library or a plugin),
accessing global variable is made using the GOT. Currently, the
GOT accessing instruction sequence our assembler generates doesn't
handle large offset well, so we don't fold the offset into loads
and stores in the compiler. Currently, the rewrite rules are
guarded with the -shared flag. However, the GOT access
instructions are only generated in the -dynlink mode (which
implies -shared, but not the other direction).
CL 445535 attempted to remove the guard althgether. But that
causes build failure for -dynlink mode for the reason above. This
CL changes it to guard specifically on -dynlink mode, allowing
the optimization in more cases (-shared but not -dynlink build
modes).
Updates #58826.
Change-Id: I1391db6a33e8d0455a304e7cae7fcfdeb49bfdab
Reviewed-on: https://go-review.googlesource.com/c/go/+/473999
Run-TryBot: Cherry Mui <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Adds:
GOEXPERIMENT=loopvar (expected way of invoking)
-d=loopvar={-1,0,1,2,11,12} (for per-package control and/or logging)
-d=loopvarhash=... (for hash debugging)
loopvar=11,12 are for testing, benchmarking, and debugging.
If enabled,for loops of the form `for x,y := range thing`, if x and/or
y are addressed or captured by a closure, are transformed by renaming
x/y to a temporary and prepending an assignment to the body of the
loop x := tmp_x. This changes the loop semantics by making each
iteration's instance of x be distinct from the others (currently they
are all aliased, and when this matters, it is almost always a bug).
3-range with captured iteration variables are also transformed,
though it is a more complex transformation.
"Optimized" to do a simpler transformation for
3-clause for where the increment is empty.
(Prior optimization of address-taking under Return disabled, because
it was incorrect; returns can have loops for children. Restored in
a later CL.)
Includes support for -d=loopvarhash=<binary string> intended for use
with hash search and GOCOMPILEDEBUG=loopvarhash=<binary string>
(use `gossahash -e loopvarhash command-that-fails`).
Minor feature upgrades to hash-triggered features; clients can specify
that file-position hashes use only the most-inline position, and/or that
they use only the basenames of source files (not the full directory path).
Most-inlined is the right choice for debugging loop-iteration change
once the semantics are linked to the package across inlining; basename-only
makes it tractable to write tests (which, otherwise, depend on the full
pathname of the source file and thus vary).
Updates #57969.
Change-Id: I180a51a3f8d4173f6210c861f10de23de8a1b1db
Reviewed-on: https://go-review.googlesource.com/c/go/+/411904
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
As described here:
https://github.com/golang/go/issues/31636#issuecomment-493271830
"Find the lexically earliest package that is not initialized yet,
but has had all its dependencies initialized, initialize that package,
and repeat."
Simplify the runtime a bit, by just computing the ordering required
in the linker and giving a list to the runtime.
Update #31636Fixes#57411
RELNOTE=yes
Change-Id: I1e4d3878ebe6e8953527aedb730824971d722cac
Reviewed-on: https://go-review.googlesource.com/c/go/+/462035
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
A 0-sized no-op shouldn't prevent us from detecting that the first
instruction is from an inlined callee.
Update #58300
Change-Id: Ic5f6ed108c54a32c05e9b2264b516f2cc17e4619
Reviewed-on: https://go-review.googlesource.com/c/go/+/467977
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
The assertion here was to make sure the newly constructed and
typechecked expression selected the same receiver-qualified method,
but in the case of anonymous receiver types we can actually end up
with separate types.Field instances corresponding to each types.Type
instance. In that case, the assertion spuriously failed.
The fix here is to relax and assertion and just compare the method's
name and type (including receiver type).
Fixes#58563.
Change-Id: I67d51ddb020e6ed52671473c93fc08f283a40886
Reviewed-on: https://go-review.googlesource.com/c/go/+/471676
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
For go/defer calls like "defer f(x, y)", the compiler rewrites it to:
x1, y1 := x, y
defer func() { f(x1, y1) }()
However, if "f" needs runtime type information, the "RType" field will
refer to the outer ".dict" param, causing wrong liveness analysis.
To fix this, if "f" refers to outer ".dict", the dict param will be
copied to an autotmp, and "f" will refer to this autotmp instead.
Fixes#58341
Change-Id: I238b6e75441442b5540d39bc818205398e80c94d
Reviewed-on: https://go-review.googlesource.com/c/go/+/466035
Reviewed-by: David Chase <drchase@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
There are a plenty of regression in 1.20 with this optimization. This CL
disable inline static init, so it's safer to backport to 1.20 branch.
The optimization will be enabled again during 1.21 cycle.
Updates #58293
Updates #58339
For #58293
Change-Id: If5916008597b46146b4dc7108c6b389d53f35e95
Reviewed-on: https://go-review.googlesource.com/c/go/+/467015
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
