walk is the only pass that use the function, so un-export it, too.
Change-Id: I32ec64d1c15fda7bb54bd8efa528ed32c102876d
Reviewed-on: https://go-review.googlesource.com/c/go/+/330841
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So next CL can move MethodValueWrapper to walk, since when walk is now
the only place which uses this function.
Change-Id: Id3be359bfc38efb022451cb7f9e53c2868fe7e12
Reviewed-on: https://go-review.googlesource.com/c/go/+/330840
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As walk already create the wrapper if necessary.
With this change, test/inline.go need to be changed to use
errorcheckwithauto, for matching "inlining call to ..." in autogenerated
position for method value wrapper, since when we don't generate the
wrapper immediately during typecheck.
Change-Id: I9ffbec9ad3c2b7295546976e2fa517336c13c89b
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Go spec call them "method values", not "partial calls". Note that
we use "OMETHVALUE" (as opposed to "OMETHODVALUE") to be consistent
with "OMETHEXPR".
Change-Id: I1efd985d4b567a1b4b20aeb603eb82db579edbd5
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Method value wrappers will need dictionary support too, so bring them
under the unified IR umbrella as well.
Change-Id: Iec36bb04efdf59843d1b00f55d2c44bc841fa2ef
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Instead, just testing the runtime package in short mode instead of std.
So trybot can help catching any mistake earlier.
Change-Id: I5bc859a59afa13a10d436a798258ac154c7d27b2
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CL 330831 moved rewrite method calls to typecheck pass, then add Fatalf
check for mis-used of OCALLMETH in all frontend passes. The check in SSA
generation pass is now redundant.
Change-Id: If959b774ab3c3aeefabf32333f77b9a93c156ce3
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CL 330671 move rewriting method call to method expression to escape
analysis. This CL move the rewriting up further, into typecheck. It
helps simplify the code for dowstream passes, as they now only have to
deal with OCALLFUNC.
There're two notes:
- For -G=3, we can't rewrite d.M() where d is an instantiated receiver
in transformCall, but let irgen.stencil to rewrite it.
- Escape analysis still have to check for rewriting method calls, as
the devirtualization pass can still generate OCALLMETH.
Does not pass toolstash, since when the export data now contains method
expression calls instead of method calls.
Change-Id: I77465ef04d50dc4efedddca7eb55b3fc9483db0e
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Since when walkCall1 still need to handle OCALLMETH.
Change-Id: Iadb12a0965169c63f97978c96412012ef4fa02df
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CL 330671 moved rewrite method calls to escape analysis. It accidently
made the AST invalid, by removing the OCALLMETH set operation during
devirtualization pass.
Change-Id: I862ffd7f880de55969d7784d9e7b3c38894f6b68
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This CL changes typecheck and order to use Type.LinkString for
computing map keys instead of Type.NameString. As mentioned in the
LinkString docs (added by the previous CL), LinkString reliably maps
type identity to string equality as long as the LinkString calls all
happen within the same compilation unit (which they do here).
This eliminates the need for subsequent types.Identical checks.
Change-Id: I32ff591e69d6f23f2dc6ebd5af343618ebe89013
Reviewed-on: https://go-review.googlesource.com/c/go/+/330911
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The original names "ShortString" and "LongString" refer back to the
fmt verbs used to request their formatting styles. However, I always
get confused working with them, in particular because (1) the
"ShortString" description, which uses package-path qualification, is
actually generally longer than the "LongString" description, which
uses package-name qualification; and (2) the documentation mentions
how they're often used, but doesn't actually describe why they're safe
for those purposes.
This CL renames them to "LinkString" and "NameString", respectively,
based on their primary use cases. It also attempts to more completely
describe the strings they return and how they can be used correctly.
Change-Id: I9158ae3eafa8ac53da31a78c7a6d929dc0199afe
Reviewed-on: https://go-review.googlesource.com/c/go/+/330910
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While initially building out unified IR, I didn't have any indexing
scheme. Everything was written out in order. Consequently, if I wanted
to write A before B, I had to compute A before B.
One particular example of this is handling closure variables: the
reader needs the list of closure variables before it can start reading
the function body, so I had to write them out first, and so I had to
compute them first in a separate, dedicated pass.
However, that constraint went away a while ago. For example, it's now
possible to replace the two-pass closure variable capture with a
single pass. We just write out the function body earlier, but then
wait to write out its index.
I anticipate this approach will make it easier to implement
dictionaries: rather than needing a separate pass to correctly
recognize and handle all of the generics cases, we can just hook into
the existing logic.
Change-Id: Iab1e07f9202cd5d2b6864eef10116960456214df
Reviewed-on: https://go-review.googlesource.com/c/go/+/330851
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We need to start the capture walk from expr.Body, not expr, otherwise
in quirks mode we'll set all of the captured variables' positions to
expr.Body.Rbrace.
Change-Id: Ic93f2773ae3756c2ec88dac17b4e9fb5a0771734
Reviewed-on: https://go-review.googlesource.com/c/go/+/330889
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This CL extends unified IR to handle creating wrapper methods. There's
relatively little about this code that's actually specific to unified
IR, but rewriting this logic allows a few benefits:
1. It decouples unified IR from reflectdata.methodWrapper, so the
latter code can evolve freely for -G=3's needs. This will also allow
the new code to evolve to unified IR's wrapper needs, which I
anticipate will operate slightly differently.
2. It provided an opportunity to revisit a lot of the code and
simplify/update it to current style. E.g., in the process, I
discovered #46903, which unified IR now gets correctly. (I have not
yet attempted to fix reflectdata.methodWrapper.)
3. It gives a convenient way for unified IR to ensure all of the
wrapper methods it needs are generated correctly.
For now, the wrapper generation is specific to non-quirks mode.
Change-Id: I5798de6b141f29e8eb6a5c563e7049627ff2868a
Reviewed-on: https://go-review.googlesource.com/c/go/+/330569
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This CL refactors out a single reflectdata.NeedEmit function that
reports whether the current compilation unit needs to emit the runtime
type descriptor and method wrappers for a given type.
As a minor side bonus, this CL also skips compiling the "error.Error"
wrapper in non-runtime packages. Package runtime already
unconditionally emitted the runtime type descriptor for error, so we
just need to make sure it emits the wrapper and other packages don't.
Passes toolstash -cmp.
Change-Id: Ic9ea219dfba8a0a57f2f42f817bdff7618732bff
Reviewed-on: https://go-review.googlesource.com/c/go/+/330754
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This CL refactors CaptureVars to use a visitor type so it's easier to
break out helper functions to review.
It also simplifies the quirks-mode handling of function literals:
instead of trying to maintain information about whether we're inside a
function literal or not, it now just rewrites the recorded position
information for any newly added free variables after walking the
function literal.
(Quirks mode is only for "toolstash -cmp"-style binary output testing
of normal code and will eventually be removed, so I don't think it's
important that this is an O(N^2) algorithm for deeply nested function
literals with lots of free variables.)
Change-Id: I0689984f6d88cf9937d4706d2d8de96415eaeee3
Reviewed-on: https://go-review.googlesource.com/c/go/+/330789
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Conflicts:
- src/go/types/check_test.go
CL 330629 fixed a bug in package qualification logic
- src/internal/buildcfg/exp.go
CL 329930 make parseExperiments get go arch string as input param
Merge List:
+ 2021-06-25 37f9a8f69d go/types: fix a bug in package qualification logic
+ 2021-06-24 c309c89db5 reflect: document that InterfaceData is a low-entropy RNG
+ 2021-06-24 cce621431a cmd/compile: fix wrong type in SSA generation for OSLICE2ARRPTR
+ 2021-06-24 600a2a4ffb cmd/go: don't try to add replaced versions that won't be selected
+ 2021-06-24 a9bb38222a net: remove hard-coded timeout in dialClosedPort test helper
+ 2021-06-24 86d72fa2cb time: handle invalid UTF-8 byte sequences in quote to prevent panic
+ 2021-06-24 44a12e5f33 cmd/go: search breadth-first instead of depth-first for test dependency cycles
+ 2021-06-24 73496e0df0 net: use absDomainName in the Windows lookupPTR test helper
+ 2021-06-24 222ed1b38a os: enable TestFifoEOF on openbsd
+ 2021-06-22 0ebd5a8de0 cmd/go: update ToolTags based on GOARCH value
+ 2021-06-22 5bd09e5efc spec: unsafe.Add/Slice are not permitted in statement context
+ 2021-06-22 666315b4d3 runtime/internal/atomic: remove incorrect pointer indirection in comment
+ 2021-06-22 63daa774b5 go/types: guard against checking instantiation when generics is disabled
+ 2021-06-22 197a5ee2ab cmd/gofmt: remove stale documentation for the -G flag
+ 2021-06-22 9afd158eb2 go/parser: parse an ast.IndexExpr for a[]
+ 2021-06-21 1bd5a20e3c cmd/go: add a -go flag to 'go mod graph'
+ 2021-06-21 761edf71f6 cmd/internal/moddeps: use a temporary directory for GOMODCACHE if needed
+ 2021-06-21 a0400420ad cmd/internal/moddeps: use -mod=readonly instead of -mod=mod
+ 2021-06-21 3f9ec83b10 cmd/go: document GOPPC64 environment variable
+ 2021-06-21 20bdfba325 go/scanner: fall back to next() when encountering 0 bytes in parseIdentifier
+ 2021-06-21 44f9a3566c database/sql: fix deadlock test in prepare statement
Change-Id: I16490e8ea70ee65081f467223857033842da513a
CL 330331 extended escape analysis to analyze method expression calls
the same as normal method calls. We can now simply desugar method calls
into function calls in escape analysis.
To do this, two things must be changed:
- Folding the rewrite method call to method expression call into an
export function in typecheck package, so others can re-use it.
- walkCall now have to call usemethod for method expression calls.
(It seems to me this is a bug in current tip, because if one write
(*rtype).Method(typ, i) in package "reflect", then the function won't
be marked with AttrReflectMethod)
Passes toolstash -cmp.
Change-Id: I4745ab6110b417c7fd32949cc799811a882cd2ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/330671
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By checking for method name first.
Passes toolstash -cmp
Change-Id: I1f4125157a8bc247e4766a882467b805a205a3c2
Reviewed-on: https://go-review.googlesource.com/c/go/+/330670
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OCALLMETH is rewritten by walkCall to OCALLFUNC, and other places in
backend have already caught it. So do the same thing in state.expr for
consistency and prevent mis-use in frontend side.
While at it, also remove un-used function getParam.
Change-Id: I03e1ea907e0bcb05fa35fa81804c33b5c9a4d77e
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CL 313035 had a bug, initializing pkgPathMap by walking the imported
package being considered rather than check.pkg.
Fix this, and enhance our tests to exercise this bug as well as other
edge cases.
Also fix error assertions in issues.src to not use quotation marks
inside the error regexp. The check tests only matched the error regexp
up to the first quotation mark.
Fixes#46905
Change-Id: I6aa8eae4bec6495006a5c03fc063db0d66b44cd6
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In normal build configurations, we test both -G=0 and -G=3 so that we
can test both typecheck and types2. However, GOEXPERIMENT=unified
always uses types2, so testing both is redundant.
Change-Id: I697d2ad916d8b17cfaf4f0b6b32eec380d4e7906
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Similar to the previous CL to suppress escape analysis diagnostics for
method wrappers, suppress liveness analysis diagnostics too. It's
hardly useful to know that all of a wrapper method's arguments are
live at entry.
Change-Id: I0d1e44552c6334ee3b454adc107430232abcb56a
Reviewed-on: https://go-review.googlesource.com/c/go/+/330749
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This is code in progress to generate the two main other types of entries
in dictionaries:
- all types in the instantiated function derived from the type
arguments (which are currently concrete, but will eventually be
gcshapes)
- pointers (i.e. mainly the unique name) to all needed sub-dictionaries
In order to generate these entries, we now generate cached information
gfInfo about generic functions/methods that can be used for creating the
instantiated dictionaries. We use the type substituter to compute the
right type args for instantiated sub-dictionaries.
If infoPrintMode is changed to true, the code prints out all the
information gathered about generic functions, and also the entries in
all the dictionaries that are instantiated. The debug mode also prints
out the locations where we need main dictionaries in non-instantiated
functions.
Other changes:
- Moved the dictionary generation back to stencil.go from reflect.go,
since we need to do extra analysis for the new dictionary entries. In
the process, made getInstantiation generate both the function
instantiation and the associated dictionary.
- Put in small change for now in reflect.go, so that we don't try
generate separate dictionaries for Value[T].get and the
auto-generated (*Value[T]).get. The auto-generated wrapper shouldn't really
need a dictionary.
- Detected, but not handling yet, a new case which needs
dictionaries - closures that have function params or captured
variables whose types are derived from type arguments.
- Added new tests in dictionaryCapture for use of method
value/expressions in generic functions and for mutually recursive
generic functions.
Change-Id: If0cbde8805a9f673a23f5ec798769c85c9c5359b
Reviewed-on: https://go-review.googlesource.com/c/go/+/327311
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Change-Id: Ie26b9060630e2e774ac23d8492eaaf785bfca6b7
Reviewed-on: https://go-review.googlesource.com/c/go/+/330709
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
This CL changes escape analysis to skip reporting diagnostics (at
least for parameter tagging) for generated wrappers.
We're inconsistent about when/where wrappers are generated, which made
errorcheck tests of escape analysis unnecessarily brittle to changes
in wrapper generation. This CL addresses this making errorcheck tests
only care about tagging of the actual functions themselves, not the
wrappers too.
Change-Id: Ia1a0b9dabee4d4162b05647f871db03b032c945a
Reviewed-on: https://go-review.googlesource.com/c/go/+/330689
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In Go 1.12, we added a heuristic to 'go mod tidy' to resolve packages
by adding replaced-but-not-required modules before falling back to
searching for modules from the network. Unfortunately, that heuristic
fails when the replaced version is already lower than the selected
version: adding such a module to the build list doesn't change the
selected version of that module, and so it doesn't make progress
toward resolving the missing package.
Fixes#46659
Change-Id: I75e2387d5290e769f6b0fa1231dcc4605db68597
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CL 329571 fold the checking has type params logic, but did not realize
that the instance in typIdx can be folded, too.
Change-Id: I4682af3779535af6a6e843972cada12ba1bae6ae
Reviewed-on: https://go-review.googlesource.com/c/go/+/330389
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The previous code for walking the syntax AST to find declarations
needed to know whether a declaration appeared within block scope, but
syntax.Crawl (née syntax.Walk) made that somewhat awkward.
This CL simplifies it a little, taking advantage of syntax.Walk's
support for keeping per-subtree state.
Change-Id: I03c7da8c44bec40f88e983852dc6bbab7e6ac13c
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The helper function claims that dialing a closed port should be
"nearly instantaneous", but that is empirically not the case on
OpenBSD or Windows. The tests do not appear to be particularly
sensitive to the exact upper bound otherwise, so let's just
remove the arbitrary latency assumption.
Fixes#46884
Change-Id: If00c9fdc3063da6aaf60d365d4a2ee2c94dc6df1
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Fixes#46883
Updates CL 267017
Change-Id: I15c307bfb0aaa2877a148d32527681f79df1a650
Reviewed-on: https://go-review.googlesource.com/c/go/+/330289
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When we are looking for a dependency cycle involving a specific
package, we need to keep track of visited packages in order to avoid
repeatedly traversing a cycle that does not involve that package.
If we're keeping track of all visited packages anyway, we're already
spending O(N) memory on the traversal, so we may as well use
breadth-first search. That not only keeps the bookkeeping simple, but
also guarantees that we will find a shortest path (rather than a
completely arbitrary one).
Fixes#45863
Change-Id: I810c7337857e42dcb83630abbdea75021554be45
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The real net code uses subtle heuristics to transform a domain name
to its absolute form. Since lookupPTR isn't checking that
transformation specifically, it should use the real code instead of
using a different heuristic.
Fixes#46882
Change-Id: I503357e0f62059c37c359cd54b44d343c7d5ab2a
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Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
The test successfully runs on currently supported versions (6.8 and
6.9) of openbsd.
Fixes#25877
Change-Id: I2694f08c5596b486453c2ac829f17b8bc455f828
Reviewed-on: https://go-review.googlesource.com/c/go/+/329732
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Trust: Tobias Klauser <tobias.klauser@gmail.com>
- Fix handling of method expressions with embedded fields. Fix an
incorrect lookup for method expressions, which have only the
top-level type (and don't have DOT operations for the embedded
fields). Add the embedded field dot operations into the closure.
- Don't need a dictionary and so don't build a closure if the last
embedded field reached in a method expression is an interface value.
- Fix methodWrapper() to use the computed 'dot' node in the
generic-only part of the code.
- For a method expression, don't create a generic wrapper if the last
embedded field reached before the method lookup is an interface.
Copied cmd/compile/internal/types2/testdata/fixedbugs/issue44688.go2 to
test/typeparam/issue44688.go, made it fully runnable (rather than just
for compilation), and added a bunch more tests.
Change-Id: I90c1aa569e1c7272e986c9d2ae683e553c3a38a1
Reviewed-on: https://go-review.googlesource.com/c/go/+/329550
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Reviewed-by: Keith Randall <khr@golang.org>
This CL adds go/ast's Visitor, Walk, and Inspect functions to package
syntax. Having functions with the same API and semantics as their
go/ast counterparts reduces the mental load of context switching
between go/ast and syntax.
It also renames the existing Walk function into Crawl, and marks it as
a deprecated wrapper around Inspect. (I named it "Crawl" because it's
less functional than "Walk"... get it??)
There aren't that many callers to Crawl, so we can probably remove it
in the future. But it doesn't seem pressing, and I'm more concerned
about the risk of forgetting to invert a bool condition somewhere.
Change-Id: Ib2fb275873a1d1a730249c9cb584864cb6ec370e
Reviewed-on: https://go-review.googlesource.com/c/go/+/330429
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Trust: Robert Griesemer <gri@golang.org>
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Reviewed-by: Robert Griesemer <gri@golang.org>
When wrapping a go/defer statement like:
go f(g(), "x", 42)
we were wrapping it like:
_0, _1, _2, _3 := f, g(), "x", 42
go func() { _0(_1, _2, _3) }()
This is simple and general (and often necessary), but suboptimal in
some cases, such as this. Instead of evaluating the constant arguments
at the go/defer statement, and storing them into the closure context,
we can just keep them in the wrapped call expression.
This CL changes the code to instead generate (assuming f is a declared
function, not a function-typed variable):
_0 := g()
go func() { f(_0, "x", 42) }()
Change-Id: I2bdd4951e7ee93363e1656ecf9b5bd69a121c38a
Reviewed-on: https://go-review.googlesource.com/c/go/+/330332
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
This CL extends escape analysis to analyze function calls using method
expressions the same as it would a normal method call. That is, it now
analyzes "T.M(recv, args...)" the same as "recv.M(args...)".
This is useful because it means the frontend can eventually stop
supporting both function calls and method calls. We can simply desugar
method calls into function calls, like we already do in the backend to
simplify SSA construction.
Change-Id: I9cd5ec0d534cbcd9860f0014c86e4ae416920c26
Reviewed-on: https://go-review.googlesource.com/c/go/+/330331
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
This CL moves two bits of related code from order.go to escape
analysis:
1. The recognition of "unsafe uintptr" arguments passed to
syscall-like functions.
2. The wrapping of go/defer function calls in parameter-free function
literals.
As with previous CLs, it would be nice to push this logic even further
forward, but for now escape analysis seems most pragmatic.
A couple side benefits:
1. It allows getting rid of the uintptrEscapesHack kludge.
2. When inserting wrappers, we can move some expressions into the
wrapper and escape analyze them better. For example, the test
expectation changes are all due to slice literals in go/defer calls
where the slice is now constructed at the call site, and can now be
stack allocated.
Change-Id: I73679bcad7fa8d61d2fc52d4cea0dc5ff0de8c0c
Reviewed-on: https://go-review.googlesource.com/c/go/+/330330
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Currently ORECOVER is a single operation that both (1) calculates
the (logical) caller frame pointer and (2) calls runtime.gorecover.
This is normally fine, but it's inconvenient for regabi, which wants
to wrap "defer recover()" into "defer func() { recover() }" and
needs (1) and (2) to happen at different times.
The current solution is to apply walkRecover early to split it into
the two steps, but calling it during order is a minor layering
violation. It works well today because the order and walk phases are
closely related anyway and walkRecover is relatively simple, but it
won't work for go/defer wrapping earlier into the frontend.
This CL adds a new, lower-level ORECOVERFP primitive, which represents
just part (2); and OGETCALLER{PC,SP} primitives, which provide a way
to compute (1) in the frontend too.
OGETCALLERPC isn't needed/used today, but it seems worth including for
completeness. Maybe it will be useful at some point for intrinsifying
runtime.getcaller{pc,sp}, like we already do for runtime.getg.
Change-Id: Iaa8ae51e09306c45c147b6759a5b7c24dcc317ca
Reviewed-on: https://go-review.googlesource.com/c/go/+/330192
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
This CLs adds new frontend ops that will be used in the next CL. Split
out separately so generated code is less distracting in the main CL.
Change-Id: I66125e0ec2217bfa05f7b0ea0bc99ada13f563f7
Reviewed-on: https://go-review.googlesource.com/c/go/+/330191
Trust: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cherry Mui <cherryyz@google.com>
The current go/defer wrapping code goes to some length to clear
ClosureCalled when a function call will end up not being called
directly, and so it will need to use the context register.
But we already have a flag to indicate we need to use the context
register: Needctxt. The real issue here is just that buildssa was
using fn.ClosureCalled instead of fn.Needctxt.
Change-Id: Ic9f5f23b66eb467fc61fa84eacb45d46c54133d2
Reviewed-on: https://go-review.googlesource.com/c/go/+/330329
Trust: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
This CL is a prep refactoring for an upcoming CL to move go/defer
wrapping into escape analysis. That CL is unfortunately unavoidably
complex and subtle, so this CL takes care of some more mundane
refactoring details.
Change-Id: Ifbefe1d522a8d57066646be09536437f42e7082c
Reviewed-on: https://go-review.googlesource.com/c/go/+/330251
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
This flag is only needed to prevent the directClosureCall optimization
in walkCall, when called for walkGoDefer. But walkGoDefer don't need
to call walkCall: at this point in the compile, the call expression
isn't a real call anymore.
Instead, we just need to walkExpr on the function expression.
Change-Id: I8a5176cfe1bff53700cbd21ed1b479ebd9a839ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/330271
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Trust: Matthew Dempsky <mdempsky@google.com>
order already takes care of wrapping all go/defer function calls, so
there's no need for walk to duplicate that logic: it's never going to
be used.
Change-Id: I54e545404e52ab8f9d60151d1bd2aff4b9bd8b72
Reviewed-on: https://go-review.googlesource.com/c/go/+/330270
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Trust: Matthew Dempsky <mdempsky@google.com>
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