CL 450136 added handling for simple calls in staticinit. If there's any
derived types conversion in the body of generic function called, that
conversion will require runtime dictionary, thus the optimization could
not happen.
Fixes#56923
Change-Id: I498cee9f8ab4397812ef79a6c2ab6c55e0ee4aef
Reviewed-on: https://go-review.googlesource.com/c/go/+/453315
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if q != nil {
p = &q.f
}
Which gets rewritten to a conditional move:
tmp := &q.f
p = Select q!=nil, tmp, p
Unfortunately, we can't compute &q.f before we've checked if q is nil,
because if it is nil, &q.f is an invalid pointer (if f's offset is
nonzero but small).
Normally this is not a problem because the tmp variable above
immediately dies, and is thus not live across any safepoint. However,
if later there is another &q.f computation, those two computations are
CSEd, causing tmp to be used at both use points. That will extend
tmp's lifetime, possibly across a call.
Fixes#56990
Change-Id: I3ea31be93feae04fbe3304cb11323194c5df3879
Reviewed-on: https://go-review.googlesource.com/c/go/+/454155
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This was disabled in CL 452676 out of an abundance of caution,
but further analysis has shown that the failures were not being
caused by this optimization. Instead the sequence of commits was:
CL 450136 cmd/compile: handle simple inlined calls in staticinit
...
CL 449937 archive/tar, archive/zip: return ErrInsecurePath for unsafe paths
...
CL 451555 cmd/compile: fix static init for inlined calls
The failures in question became compile failures in the first CL
and started building again after the last CL.
But in the interim the code had been broken by the middle CL.
CL 451555 was just the first time that the tests could run and fail.
For #30820.
Change-Id: I65064032355b56fdb43d9731be2f9f32ef6ee600
Reviewed-on: https://go-review.googlesource.com/c/go/+/452817
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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This CL adds -d=inlstaticinit to control whether static initialization
of inlined function calls (added in CL 450136) is allowed.
We've needed to fix it once already (CL 451555) and Google-internal
testing is hitting additional failure cases, so putting this
optimization behind a feature flag seems appropriate regardless.
Also, while we diagnose and fix the remaining cases, this CL also
disables the optimization to avoid miscompilations.
Updates #56894.
Change-Id: If52a358ad1e9d6aad1c74fac5a81ff9cfa5a3793
Reviewed-on: https://go-review.googlesource.com/c/go/+/452676
Reviewed-by: Cherry Mui <cherryyz@google.com>
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This CL changes cmd/compile to reject anonymous interface cycles like:
type I interface { m() interface { I } }
We don't anticipate any users to be affected by this change in
practice. Nonetheless, this CL also adds a `-d=interfacecycles`
compiler flag to suppress the error. And assuming no issue reports
from users, we'll move the check into go/types and types2 instead.
Updates #56103.
Change-Id: I1f1dce2d7aa19fb388312cc020e99cc354afddcb
Reviewed-on: https://go-review.googlesource.com/c/go/+/445598
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The previous rule may move the phi value into a wrong block.
This CL make it only rewrite the phi value not the If block,
so that the phi value will stay in old block.
Fixes#56777
Change-Id: I9479a5c7f28529786968413d35b82a16181bb1f1
Reviewed-on: https://go-review.googlesource.com/c/go/+/451496
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Reviewed-by: David Chase <drchase@google.com>
For implementing interface to empty interface conversion, the compiler
generate code like:
var res *uint8
res = itab
if res != nil {
res = res.type
}
However, itab has type *uintptr, so the assignment is broken. The
problem is not shown up, until CL 450215, which call typecheck on this
broken assignment.
To fix this, just cast itab to *uint8 when doing the conversion.
Fixes#56768
Change-Id: Id42792d18e7f382578b40854d46eecd49673792c
Reviewed-on: https://go-review.googlesource.com/c/go/+/451256
Reviewed-by: Keith Randall <khr@google.com>
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CL 450136 made the compiler to be able to handle simple inlined calls in
staticinit. However, it's missed a condition when checking substituting
arg for param. If there's any non-trivial closures, it has captured one
of the param, so the substitution could not happen.
Fixes#56778
Change-Id: I427c9134e333e2f9af136c1a124da4d37d326f10
Reviewed-on: https://go-review.googlesource.com/c/go/+/451555
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Reviewed-by: David Chase <drchase@google.com>
CL 440455 fixed missing walk pass for static initialization slice.
However, slicelit may produce un-typechecked node, thus we need to do
typecheck for sinit before calling walkStmtList.
Fixes#56727
Change-Id: I40730cebcd09f2be4389d71c5a90eb9a060e4ab7
Reviewed-on: https://go-review.googlesource.com/c/go/+/450215
Reviewed-by: Keith Randall <khr@golang.org>
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If an imported, non-generic function F transitively calls a generic
function G[T], we may need to call CanInline on G[T].
While here, we can also take advantage of the fact that we know G[T]
was already seen and compiled in an imported package, so we don't need
to call InlineCalls or add it to typecheck.Target.Decls. This saves us
from wasting compile time re-creating DUPOK symbols that we know
already exist in the imported package's link objects.
Fixes#56280.
Change-Id: I3336786bee01616ee9f2b18908738e4ca41c8102
Reviewed-on: https://go-review.googlesource.com/c/go/+/443535
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Prior to Go 1.18, ineffectual //go:linkname directives (i.e.,
directives referring to an undeclared name, or to a declared type or
constant) were treated as noops. In Go 1.18, we changed this into a
compiler error to mitigate accidental misuse.
However, the x/sys repo contained ineffectual //go:linkname directives
up until go.dev/cl/274573, which has caused a lot of user confusion.
It seems a bit late to worry about now, but to at least prevent
further user pain, this CL changes the error message to only apply to
modules using "go 1.18" or newer. (The x/sys repo declared "go 1.12"
at the time go.dev/cl/274573 was submitted.)
Fixes#55889.
Change-Id: Id762fff96fd13ba0f1e696929a9e276dfcba2620
Reviewed-on: https://go-review.googlesource.com/c/go/+/447755
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Error messages currently print floats with %.6g, which means that if
you tried to convert something close to, but not quite, an integer, to
an integer, the error you get looks like "cannot convert 1 to type
int", when really you want "cannot convert 0.9999999 to type int".
Add more digits to floats when printing them, to make it clear that they
aren't quite integers. This helps for errors which are the result of not
being an integer. For other errors, it won't hurt much.
Fixes#56220
Change-Id: I7f5873af5993114a61460ef399d15316925a15a5
Reviewed-on: https://go-review.googlesource.com/c/go/+/442935
Reviewed-by: Rob Pike <r@golang.org>
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Using importcfg instead of depending on the existence of .a files for
standard library packages will enable us to remove the .a files in a
future cl.
Change-Id: I6108384224508bc37d82fd990fc4a8649222502c
Reviewed-on: https://go-review.googlesource.com/c/go/+/440222
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
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fakePC uses hash.Sum32, which returns an uint32. However, libfuzzer
trace/hook functions declare fakePC argument as int, causing overflow on
386 archs.
Fixing this by changing fakePC argument to uint to prevent the overflow.
Fixes#56141
Change-Id: I3994c461319983ab70065f90bf61539a363e0a2a
Reviewed-on: https://go-review.googlesource.com/c/go/+/441996
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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For #56109
Change-Id: I999763e463fac57732a92f5e396f8fa8c35bd2e1
Reviewed-on: https://go-review.googlesource.com/c/go/+/440297
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CL 403995 fixed static init of literal contains dynamic exprs, by
ensuring their init are ordered properly. However, we still need to walk
the generated init codes before appending to parent init. Otherwise,
codes that requires desugaring will be unhandled, causing the compiler
backend crashing.
Fixes#56105
Change-Id: Ic25fd4017473f5412c8e960a91467797a234edfd
Reviewed-on: https://go-review.googlesource.com/c/go/+/440455
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The linker needs FuncInfo metadata for all inlined functions. This is
typically handled by gc.enqueueFunc calling ir.InitLSym for all function
declarations in typecheck.Target.Decls (ir.UseClosure adds all closures
to Decls).
However, non-trivial closures in Decls are ignored, and are insteaded
enqueued when walk of the calling function discovers them.
This presents a problem for direct calls to closures. Inlining will
replace the entire closure definition with its body, which hides the
closure from walk and thus suppresses symbol creation.
Explicitly create a symbol early in this edge case to ensure we keep
this metadata.
InitLSym needs to move out of ssagen to avoid a circular dependency (it
doesn't have anything to do with ssa anyway). There isn't a great place
for it, so I placed it in ir, which seemed least objectionable.
The added test triggers one of these inlined direct non-trivial closure
calls, though the test needs CL 429637 to fail, which adds a FuncInfo
assertion to the linker. Note that the test must use "run" instead of
"compile" since the assertion is in the linker, and "compiler" doesn't
run the linker.
Fixes#54959.
Change-Id: I0bd1db4f3539a78da260934cd968372b7aa92546
Reviewed-on: https://go-review.googlesource.com/c/go/+/436240
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If a cycle has length 1, don't enumerate the single cycle entry;
instead just mention "refers to itself". For instance, for an
invalid recursive type T we now report:
invalid recursive type: T refers to itself
instead of:
invalid recursive type T
T refers to
T
Adjust tests to check for the different error messages.
Change-Id: I5bd46f62fac0cf167f0d0c9a55f952981d294ff4
Reviewed-on: https://go-review.googlesource.com/c/go/+/436295
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This matches what go/types and types2 report and it also matches
the compiler errors reported for some related shift problems.
For #55326.
Change-Id: Iee40e8d988d5a7f9ff2c49f019884d02485c9fdf
Reviewed-on: https://go-review.googlesource.com/c/go/+/436177
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This is close to what the compiler used to say, except now we say
"as T value" rather than "as type T" which is closer to the truth
(we cannot use a value as a type, after all). Also, place the primary
error and the explanation (cause) on a single line.
Make respective (single line) adjustment to the matching "cannot
convert" error.
Adjust various tests.
For #55326.
Change-Id: Ib646cf906b11f4129b7ed0c38cf16471f9266b88
Reviewed-on: https://go-review.googlesource.com/c/go/+/436176
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Compromise between old compiler error "T.m redeclared in this block"
(where the "in this block" is not particularly helpful) and the old
type-checker error "method m already declared for type T ...".
In the case where we have position information for the original
declaration, the error message is "method T.m already declared at
<position>". The new message is both shorter and more precise.
For #55326.
Change-Id: Id4a7f326fe631b11db9e8030eccb417c72d6c7db
Reviewed-on: https://go-review.googlesource.com/c/go/+/435016
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This is a compromise of the error reported by the compiler (quotes
around field name removed) and the error reported by the type checkers
(added mention of struct type).
For #55326.
Change-Id: Iac4fb5c717f17c6713e90d327d39e68d3be40074
Reviewed-on: https://go-review.googlesource.com/c/go/+/434815
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This matches longstanding compiler behavior.
Also, for unused packages, report:
`"pkg" imported and not used`
`"pkg" imported as X and not used`
This matches the other `X declared and not used` errors.
For #55326.
Change-Id: Ie71cf662fb5f4648449c64fc51bede298a1bdcbf
Reviewed-on: https://go-review.googlesource.com/c/go/+/432557
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For #55326
Change-Id: I3d0ff7f820f7b2009d1b226abf701b2337fe8cbc
Reviewed-on: https://go-review.googlesource.com/c/go/+/432635
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The type of the source and destination of a memmove call isn't
always accurate. It will always be a pointer (or an unsafe.Pointer), but
the base type might not be accurate. This comes about because multiple
copies of a pointer with different base types are coalesced into a single value.
In the failing example, the IData selector of the input argument is a
*[32]byte in one branch of the type switch, and a *[]byte in the other branch.
During the expand_calls pass both IDatas become just copies of the input
register. Those copies are deduped and an arbitrary one wins (in this case,
*[]byte is the unfortunate winner).
Generally an op v can rely on v.Type during rewrite rules. But relying
on v.Args[i].Type is discouraged.
Fixes#55122
Change-Id: I348fd9accf2058a87cd191eec01d39cda612f120
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Now we have 8-byte alignment types on 32-bit system, so in some rare
case, e.g, generated wrapper for embedded interface, the function
argument may need more than 4 byte alignment. We could pad somehow, but
this is a rare case which makes it hard to ensure that we've got it right.
So relaxing the check for argument and return value region of the stack.
Fixes#54991
Change-Id: I34986e17a920254392a39439ad3dcb323da2ea8d
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The unified frontend ICEs when inlining a function that contains a
function literal, which captures both a type switch case variable and
another variable.
Updates #54912.
Change-Id: I0e16d371ed5df48a70823beb0bf12110a5a17266
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It was fixed by CL 422196, and have been already worked in unified IR.
Fixes#54911
Change-Id: Ie69044a64b296f6961e667e7661d8c4d1a24d84e
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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
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Currently, gentraceback tracks the closure context of the outermost
frame. This used to be important for "unstarted" calls to reflect
function stubs, where "unstarted" calls are either deferred functions
or the entry-point of a goroutine that hasn't run. Because reflect
function stubs have a dynamic argument map, we have to reach into
their closure context to fetch to map, and how to do this differs
depending on whether the function has started. This was discovered in
issue #25897.
However, as part of the register ABI, "go" and "defer" were made much
simpler, and any "go" or "defer" of a function that takes arguments or
returns results gets wrapped in a closure that provides those
arguments (and/or discards the results). Hence, we'll see that closure
instead of a direct call to a reflect stub, and can get its static
argument map without any trouble.
The one case where we may still see an unstarted reflect stub is if
the function takes no arguments and has no results, in which case the
compiler can optimize away the wrapper closure. But in this case we
know the argument map is empty: the compiler can apply this
optimization precisely because the target function has no argument
frame.
As a result, we no longer need to track the closure context during
traceback, so this CL drops all of that mechanism.
We still have to be careful about the unstarted case because we can't
reach into the function's locals frame to pull out its context
(because it has no locals frame). We double-check that in this case
we're at the function entry.
I would prefer to do this with some in-code PCDATA annotations of
where to find the dynamic argument map, but that's a lot of mechanism
to introduce for just this. It might make sense to consider this along
with #53609.
Finally, we beef up the test for this so it more reliably forces the
runtime down this path. It's fundamentally probabilistic, but this
tweak makes it better. Scheduler testing hooks (#54475) would make it
possible to write a reliable test for this.
For #54466, but it's a nice clean-up all on its own.
Change-Id: I16e4f2364ba2ea4b1fec1e27f971b06756e7b09f
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So they can be added to ignored list, since the tests now require
cgo.Incomplete, which is not recognized by go/types and types2.
Updates #46731
Change-Id: I9f24e3c8605424d1f5f42ae4409437198f4c1326
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On AIX when external linking, for some symbols we need to add
dummy references to prevent the external linker from discarding
them. Currently we add the reference unconditionally. But if the
symbol doesn't exist, the linking fails in a later stage for
generating external relocation of a nonexistent symbol. The
symbols are special symbols that almost always exist, except that
go:buildid may not exist if the linker is invoked without the
-buildid flag. The go command invokes the linker with the flag, so
this can only happen with manual linker invocation. Specifically,
test/run.go does this in some cases.
Fix this by checking the symbol existence before adding the
reference. Re-enable tests on AIX.
Perhaps the linker should always emit a dummy buildid even if the
flag is not set...
Fixes#54814.
Change-Id: I43d81587151595309e189e38960cbda9a1c5ca32
Reviewed-on: https://go-review.googlesource.com/c/go/+/427620
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So it won't be visible outside of runtime package. There are changes to
make tests happy:
- For test/directive*.go files, using "go:noinline" for testing misplaced
directives instead.
- Restrict test/fixedbugs/bug515.go for gccgo only.
- For test/notinheap{2,3}.go, using runtime/cgo.Incomplete for marking
the type as not-in-heap. Though it's somewhat clumsy, it's the easiest
way to keep the test errors for not-in-heap types until we can cleanup
further.
- test/typeparam/mdempsky/11.go is about defined type in user code marked
as go:notinheap, which can't happen after this CL, though.
Fixes#46731
Change-Id: I869f5b2230c8a2a363feeec042e7723bbc416e8e
Reviewed-on: https://go-review.googlesource.com/c/go/+/421882
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The syntax for go and defer specifies an arbitrary expression, not
a call; the call requirement is spelled out in prose. Don't to the
call check in the parser; instead move it to the type checker. This
is simpler and also allows the type checker to check expressions that
are not calls, and avoid "not used" errors due to such expressions.
We would like to make the same change in go/parser and go/types
but the change requires Go/DeferStmt nodes to hold an ast.Expr
rather than an *ast.CallExpr. We cannot change that for backward-
compatibility reasons. Since we don't test this behavior for the
type checkers alone (only for the compiler), we get away with it
for now.
Follow-up on CL 425675 which introduced the extra errors in the
first place.
Change-Id: I90890b3079d249bdeeb76d5673246ba44bec1a7b
Reviewed-on: https://go-review.googlesource.com/c/go/+/425794
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- Use "expected X" rather then "expecting X".
- Report a better error when a type argument list is expected.
- Adjust various tests.
For #54511.
Change-Id: I0c5ca66ecbbdcae1a8f67377682aae6b0b6ab89a
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If the go/defer syntax is bad, using a fake CallExpr may produce
a follow-on error in the type checker. Instead store a BadExpr
in the syntax tree (since an error has already been reported).
Adjust various tests.
For #54511.
Change-Id: Ib2d25f8eab7d5745275188d83d11620cad6ef47c
Reviewed-on: https://go-review.googlesource.com/c/go/+/425675
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Since when go/types,types2 do not know about build constraints, and
runtime/cgo.Incomplete is only available on platforms that support cgo.
These tests are also failing on aix with failure from linker, so disable
them on aix to make builder green. The fix for aix is tracked in #54814
Updates #46731
Updates #54814
Change-Id: I5d6f6e29a8196efc6c457ea64525350fc6b20309
Reviewed-on: https://go-review.googlesource.com/c/go/+/427394
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Same as CL 421880, but for test directory.
Updates #46731
Change-Id: If8d18df013a6833adcbd40acc1a721bbc23ca6b2
Reviewed-on: https://go-review.googlesource.com/c/go/+/421881
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Shape-based stenciling in unified IR is done by converting type argument
to its underlying type. So it agressively check that type argument is
not a TFORW. However, for recursive instantiated type argument, it may
still be a TFORW when shapifying happens. Thus the assertion failed,
causing the compiler crashing.
To fix it, just allow fully instantiated type when shapifying.
Fixes#54512Fixes#54722
Change-Id: I527e3fd696388c8a37454e738f0324f0c2ec16cb
Reviewed-on: https://go-review.googlesource.com/c/go/+/426335
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Reviewed-by: Matthew Dempsky <mdempsky@google.com>
In typebits.Set we check that the offset is a multiple of the
alignment, which makes perfect sense. But for values like
atomic.Int64, which has 8-byte alignment even on 32-bit platforms
(i.e. the alignment is larger than PtrSize), if it is on stack it
may be under-aligned, as the stack frame is only PtrSize aligned.
Normally we would prevent such values on stack, as the escape
analysis force values with higher alignment to heap. But for a
composite literal assignment like x = AlignedType{...}, the
compiler creates an autotmp for the RHS then copies it to the LHS.
The autotmp is on stack and may be under-aligned. Currently this
may cause an ICE in the typebits.Set check.
This CL makes it align the _offset_ of the autotmp to 8 bytes,
which satisfies the check. Note that this is actually lying: the
actual address at run time may not necessarily be 8-byte
aligned as we only align SP to 4 bytes.
The under-alignment is probably okay. The only purpose for the
autotmp is to copy the value to the LHS, and the copying code we
generate (at least currently) doesn't care the alignment beyond
stack alignment.
Fixes#54638.
Change-Id: I13c16afde2eea017479ff11dfc24092bcb8aba6a
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This CL changes the inliner to process transitive inlining iteratively
after the AST has actually been edited, rather than recursively and
immediately. This is important for handling indirect function calls
correctly, because ir.reassigned walks the function body looking for
reassignments; whereas previously the inlined reassignments might not
have been actually added to the AST yet.
Fixes#54632.
Change-Id: I0dd69813c8a70b965174e0072335bc00afedf286
Reviewed-on: https://go-review.googlesource.com/c/go/+/425257
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Normally, when moving Go values of type T from one location to another,
we don't need to worry about partial overlaps. The two Ts must either be
in disjoint (nonoverlapping) memory or in exactly the same location.
There are 2 cases where this isn't true:
1) Using unsafe you can arrange partial overlaps.
2) Since Go 1.17, you can use a cast from a slice to a ptr-to-array.
https://go.dev/ref/spec#Conversions_from_slice_to_array_pointer
This feature can be used to construct partial overlaps of array types.
var a [3]int
p := (*[2]int)(a[:])
q := (*[2]int)(a[1:])
*p = *q
We don't care about solving 1. Or at least, we haven't historically
and no one has complained.
For 2, we need to ensure that if there might be partial overlap,
then we can't use OpMove; we must use memmove instead.
(memmove handles partial overlap by copying in the correct
direction. OpMove does not.)
Note that we have to be careful here not to introduce a call when
we're marshaling arguments to a call or unmarshaling results from a call.
Fixes#54467
Change-Id: I1ca6aba8041576849c1d85f1fa33ae61b80a373d
Reviewed-on: https://go-review.googlesource.com/c/go/+/425076
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For #23870
Change-Id: I3bbe0f751254d1354a59a88b45e6f944c7a2fb4d
Reviewed-on: https://go-review.googlesource.com/c/go/+/417874
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CL 414836 limited the check for implicit dot for method call enabled by
a type bound. However, the checking condition for ODOTMETH only is not
right. For example, for promoted method, we have a OXDOT node instead,
and we still have to check for implicit dot in this case.
However, if the base type and embedded types have the same method name,
e.g in issue #53419, typecheck.AddImplicitDots will be confused and
result in an ambigus selector.
To fix this, we ensure methods for the base type are computed, then only
do the implicit dot check if we can find a matched method.
Fixes#54348
Change-Id: Iefe84ff330830afe35c5daffd499824db108da23
Reviewed-on: https://go-review.googlesource.com/c/go/+/422274
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The issue is expected to be fixed when Unified IR is enabled by default,
so adding a test to make sure thing works correctly.
Updates #53702
Change-Id: Id9d7d7ca4506103df0d10785ed5ee170d69988ba
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