Commit Graph

115 Commits

Author SHA1 Message Date
korzhao ba7673069d cmd/compile: add required CONVIFACE nodes when translating OFUNCINST node
In CL 349614. we removed the early transformation code that
was needed to create the implicit CONVIFACE nodes.

Because the transformCall function is not called when translating OFUNCINST.
So we add in needed CONVIFACE nodes via typecheckaste().

Fixes #48598

Change-Id: If9dc7040cdc38ef2e52fdbb08c840095651426f2
Reviewed-on: https://go-review.googlesource.com/c/go/+/351856
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Dan Scales <danscales@google.com>
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
2021-09-25 17:06:17 +00:00
Dan Scales 8854368cb0 cmd/compile: deal with blank nodes with typeparam type during stenciling
Deal correctly with a blank local variable with type param type. This is
a special case, because a blank local variable is not in the fn.Dcl
list. In this case, we must explicitly create a new blank node with the
correct substituted type, so we have correct types if the blank local
variable has an initializing assignment.

Fixes #48602

Change-Id: I903ea44b29934e180404e32800773b7309bf297b
Reviewed-on: https://go-review.googlesource.com/c/go/+/352117
Run-TryBot: Dan Scales <danscales@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Trust: Dan Scales <danscales@google.com>
2021-09-25 01:24:46 +00:00
Dan Scales 812c99f86a cmd/compile: fix case in dictPass where OMETHVALUE should become ODOTMETH
When I separate out the dictionary transformations to dictPass, I missed
duplicating a conditional that deals with OMETHVALUE nodes that are
actually called. We create the OMETHVALUE when transforming bounds
function reference (before we know whether that reference will be
called), and we need to call transformDot() again to convert the
OMETHVALUE to ODOTMETH if the reference is actually called (the usual
case). Without this change, we leave the OMETHVALUE in, and extra *-fm
are created and used unncessarily.

Also, fixed a few places where we were missing ir.MarkFunc(), which sets
the class of a function node properly.

Change-Id: I6b02613039b16b507b44525faa2cd7031afb6982
Reviewed-on: https://go-review.googlesource.com/c/go/+/352069
Trust: Dan Scales <danscales@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
2021-09-24 18:11:24 +00:00
Dan Scales ee69b09424 cmd/compile: break out constants for local and global dictionary prefixes
Create constant LocalDictName for the pname/refix for dictionary
parameters or local variables, and constant GlobalDictPrefix for the
prefix for names of global dictionaries. I wanted to make sure these
constants were set up as we add more reference to dictionaries for
debugging, etc.

Change-Id: Ide801f842383300a2699c96943ec06decaecc358
Reviewed-on: https://go-review.googlesource.com/c/go/+/351450
Trust: Dan Scales <danscales@google.com>
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Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
2021-09-22 23:17:55 +00:00
Alessandro Arzilli 6268468e02 cmd/link: generate DIE for types referenced only through dictionaries
Generate debug_info entries for types that are only referenced through
dictionaries.

Change-Id: Ic36c2e6d9588ec6746793bb213c2dc0e17a8a850
Reviewed-on: https://go-review.googlesource.com/c/go/+/350532
Run-TryBot: Alessandro Arzilli <alessandro.arzilli@gmail.com>
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Reviewed-by: Dan Scales <danscales@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
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Trust: David Chase <drchase@google.com>
2021-09-20 18:31:54 +00:00
Dan Scales 07b30a4f77 cmd/compile: delay transformAssign if lhs/rhs have typeparam
This also requires that we sometimes delay transformSelect(), if the
assignments in the Comm part of the select have not been transformed.

Fixes #48137

Change-Id: I163aa1f999d1e63616280dca807561b12b2aa779
Reviewed-on: https://go-review.googlesource.com/c/go/+/347915
Trust: Dan Scales <danscales@google.com>
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Reviewed-by: Keith Randall <khr@golang.org>
2021-09-17 23:04:15 +00:00
Dan Scales 59a9a035ff cmd/compile: switch to computing dict format on instantiated functions
Change to computing the dictionary form on each shape-instantiated
function, rather than once on the underlying generic function/method.
The problem with computing the dictionary format on the generic function
is that we had to force early transformations to create all the
needed/implicit CONVIFACE nodes, since many of these nodes cause the
need for a dictionary entry. Also, the dictionary entries needed can
different with different instantiations of the same generic function,
especially depending on whether a type argument is a non-interface or
interface type, or a instantiated type vs. a non-instantiated type.

By computing the dictionary format on the instantiated function, we are
scanning a function where all the transformations have been done to
create implicit CONVFIFACE nodes, and we know the above relevant
information about the type params (which are shapes).

Much of the change is more mechanical changes from typeparams to shapes,
and generic functions/info to instantiated functions/info. Some of the
most important non-mechanical changes are:

 - Separated out the dictionary transformations to nodes into a separate
   dictPass, since we need to analyze instantiated functions after
   stenciling, but before the dictionary transformations.

 - Added type param index to shape types, since we need to be able
   distinguish type params of an instantiation which are different but
   happen to have the same shape.

 - Allow the type substituter to work with shapes again (since for the
   dictionary entries we need to substitute shape params to the concrete
   type args).

 - Support types.IdentityStrict() that does strict type comparison (no
   special case for shapes). This needed for type substitution,
   formatting and creating dictionaries, etc. We can maybe create better
   names for this function.

 - Add new information to instInfo to contain a mapping from the shape
   type params to their instantiated type bound. This is needed when
   doing the dictionary transformations related to type bounds.

Change-Id: I1c3ca312c5384f318c4dd7d0858dba9766396ff6
Reviewed-on: https://go-review.googlesource.com/c/go/+/349613
Trust: Dan Scales <danscales@google.com>
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Reviewed-by: Keith Randall <khr@golang.org>
2021-09-15 22:53:17 +00:00
Alessandro Arzilli 72bb8185b5 cmd/compile: emit DWARF info about dictionary entries
When emitting the DIE of the instantiation of a generic function also
emit one DW_TAG_typedef_type entry for each dictionary entry in use,
referencing the shape type and having a custom attribute containing the
index inside the dictionary.

When emitting the DIE of variables that have an instantiated parametric
type, instead of referencing the shape type directly go through the
DW_TAG_typedef_type entry emitted for the dictionary entry describing
the real type of the variable.

Change-Id: Ia45d157ecd4c25e2b60300469e43bbb27a663582
Reviewed-on: https://go-review.googlesource.com/c/go/+/344929
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Trust: Dan Scales <danscales@google.com>
Trust: Jeremy Faller <jeremy@golang.org>
2021-09-15 16:32:27 +00:00
korzhao c981874a5a cmd/compile: fix implement for closure in a global assignment
If closure in a global assignment and has a method receiver.
We should assign receiver as a global variable, not a local variable.

Fixes #48225

Change-Id: I8f65dd6e8baf66a5eff24028d28ad0a594091add
Reviewed-on: https://go-review.googlesource.com/c/go/+/348512
Run-TryBot: Dan Scales <danscales@google.com>
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2021-09-09 21:28:56 +00:00
Keith Randall 19457a58e5 cmd/compile: stenciled conversions might be NOPs
A generic conversion might be required for when converting T->interface{}.
When stenciled with T=interface{}, then that conversion doesn't need
to do anything.

Fixes #48276

Change-Id: Ife65d01c99fbd0895cb7eec79df9e93e752b1fa5
Reviewed-on: https://go-review.googlesource.com/c/go/+/348736
Trust: Keith Randall <khr@golang.org>
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2021-09-09 15:34:08 +00:00
Dan Scales 80783558b0 cmd/compile: make sure imported instantiated types have their methods created
We should be putting a newly instantiated imported type in
Instantiate/doInst onto the instTypeList, so its methods/dictionaries
are instantiated. To do this, we needed a more general way to add a
type to instTypeList, so add NeedInstType(), analogous to
NeedRuntimeType(). This has the extra advantage that now all types
created by the type substituter are added to instTypeList without any
extra code, which was easy to forget. doInst() now correctly calls
NeedInstType().

This is a bit aggressive, since a fully instantiated type in a generic
function/method may never be used, if the generic method is never
instantiated in the local package. But it should be fairly uncommon for
a generic method to mention a fully instantiated type (but it does
happen in this bug).

Fixes both cases mentioned in the bug.

Fixed #48185

Change-Id: I19b5012dfac17e306c8005f8595a648b0ab280d0
Reviewed-on: https://go-review.googlesource.com/c/go/+/347909
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2021-09-07 20:37:05 +00:00
korzhao ecfff58fb8 cmd/compile: fix delay transformation in *subster.node()
Add OCALL, OCALLFUNC, OCALLMETH, OCALLINTER, ODYNAMICDOTTYPE transformations to the CALL check switch statement.

Fixes #48042

Change-Id: Ied93efd979c5b2c56b72fad26fccfd9f887361d3
Reviewed-on: https://go-review.googlesource.com/c/go/+/345949
Trust: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
Reviewed-by: Dan Scales <danscales@google.com>
2021-09-06 14:02:24 +00:00
Keith Randall faf9c7d8fe cmd/compile: assign results of transformAssign back to source location
Otherwise the modifications of transformAssign are dropped on the floor.

Change-Id: Id40782564952ed53f9ade1dba4e85290c8522abc
Reviewed-on: https://go-review.googlesource.com/c/go/+/346590
Trust: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
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Reviewed-by: Dan Scales <danscales@google.com>
2021-09-01 03:50:19 +00:00
Dan Scales 2dd7b770de cmd/compile: fix missing case for shape double-check function
Missing case types.TUNSAFEPTR in parameterizedBy().

Also realized there was the same missing case in the type substituter
(*Tsubster).Typ().

Fixes #48103

Change-Id: If71f1a6ef80932f0e2120d4c18b39a30189fd8fe
Reviewed-on: https://go-review.googlesource.com/c/go/+/346669
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
2021-09-01 02:51:18 +00:00
Dan Scales 891470fbf7 cmd/compile: fix handling of Defn field during stenciling
When the Defn field of a name node is not an ONAME (for a closure
variable), then it points to a body node of the same function/closure.
Therefore, we should not attempt to substitute it at the time we are
substituting the local variables. Instead, we remember a mapping from the
Defn node to the nodes that reference it, and update the Defn fields of
the copied name nodes at the time that we create the new copy of the
Defn node.

Added some comments to the Defn field of ir.Name.

Moved the Defn (and Outer code, for consistency) from namelist() to
localvar(), since Defn needs to updated for all local variables, not
just those in a closure. Fixed case where .Defn was not being set
properly in noder2 for type switches. Fixed another case where the Defn
field had to be updated during transformSelect() because the Defn node
was being completely changed to a new node.

Fixed some spacing in typeswitch2.go

Fixes #47676
Fixes #48016

Change-Id: Iae70dd76575f4a647c1db79e1eba9bbe44bfc226
Reviewed-on: https://go-review.googlesource.com/c/go/+/346290
Trust: Dan Scales <danscales@google.com>
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Reviewed-by: Keith Randall <khr@golang.org>
2021-08-31 19:07:50 +00:00
Matthew Dempsky 82efc05403 cmd/compile: use Type.OrigSym getter/setters [generated]
Automated CL to rewrite existing code to use OrigSym getters and
setters. Afterwards, we also unexported OrigSym, and then rename the
getter to OrigSym.

[git-generate]
cd src/cmd/compile/internal

: Workaround rf issue with types2 tests.
rm types2/*_test.go

rf '
ex ./noder ./typecheck {
import "cmd/compile/internal/types"
var s *types.Sym
var t *types.Type

t.OrigSym = s -> t.SetOrigSym(s)
t.OrigSym     -> t.OrigSym_()
}
'

cd types
rf '
mv Type.OrigSym Type.origSym
mv Type.OrigSym_ Type.OrigSym
'

: Revert types2 hack.
cd ../types2
git checkout HEAD^ .

Change-Id: I8eb17098613b1575df56b8189b1615823071d3d1
Reviewed-on: https://go-review.googlesource.com/c/go/+/345485
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2021-08-27 21:27:59 +00:00
Keith Randall 6a35e07512 cmd/compile: fix stenciling of conversions between interfaces
Conversions need to allow nil through.
We do that using a CONVIFACE instead of a DOTTYPE.

Also reorganize how nonempty interfaces are handled.
For nonempty to empty, a simple CONVIFACE suffices.
For nonempty to nonempty, we need to call the runtime to get the
new itab. Use the entry from the dictionary to identify the
target interface type (if parameterized).

Fixes #47925

Change-Id: I4ffeed964318bb3e270b06f558e6ab9c5bfc7188
Reviewed-on: https://go-review.googlesource.com/c/go/+/344830
Trust: Keith Randall <khr@golang.org>
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2021-08-27 16:41:29 +00:00
Matthew Dempsky 1f8d4562de cmd/compile: change typecheck.iscmp into ir.Op.IsCmp
Change-Id: If89089cbd79b7ff030d856df3a7e6b7862c0f4ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/345412
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2021-08-26 19:07:27 +00:00
wdvxdr 08d4cc20ca cmd/compile: fix stencil call expression.
Fixes: #47878

Change-Id: I369350813726fd518b4eab2b98f43bf031a6dee6
Reviewed-on: https://go-review.googlesource.com/c/go/+/344210
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2021-08-25 16:37:31 +00:00
Keith Randall 5d863f89fe cmd/compile: simplify bad conversion check
Now that we're using OCONVIDATA(x) everywhere we formerly used
OIDATA(OCONVIFACE(x)), there should be no OCONVIFACE operations that
take a shape type.

Change-Id: I4fb056456c60481c6dfe7bc111fca6223567e6a8
Reviewed-on: https://go-review.googlesource.com/c/go/+/344577
Trust: Keith Randall <khr@golang.org>
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2021-08-24 22:10:11 +00:00
Dan Scales 5b64381155 cmd/compile: fix naming of types inside instantiations
Issues 47713 and 47877 were both due to problems with the names used for
instantiated functions/methods, which must be in sync with the names
used by types2.

 - Switched to using NameString() for writing out type arguments in
   instantiation names. This ensures that we are always adding the
   package to type names even for the local package. Previously, we were
   explicitly adding the package name for local packages, but that
   doesn't handle the case when the local type is embedded inside a
   pointer or slice type. By switching to NameString(), we fix #47713.

 - types1 and types2 write out 'interface {' differently (vs.
   'interface{') and we were already handling that. But we needed to add
   similar code to handle 'struct {' vs 'struct{'. This fixes issue
   #47877.

While fixing these bugs, I also moved some duplicated code (which
include some of the changes above) into a common function addTargs(). I
also moved InstType() name to subr.go, and renamed: MakeInstName ->
MakeFuncInstSym and MakeDictName -> MakeDictSym.

Also removed a couple of ".inst..inst." prefix checks which are
irrelvant now, since we don't add ".inst." anymore to function
instantiations.

Fixes #47713
Fixes #47877
Fixes #47922

Change-Id: I19e9a073451f3ababd8ec31b6608cd79ba8cba36
Reviewed-on: https://go-review.googlesource.com/c/go/+/344613
Trust: Dan Scales <danscales@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
2021-08-24 18:30:13 +00:00
Dan Scales 8eeb1bff1d cmd/compile: reuse same node for global dictionaries
Change stencil.go:getDictionaryValue() and reflect.go:getDictionary() to
reuse any existing name node that has been created for the needed global
dictionary. Otherwise, these functions may set the Def on a specific
dictionary sym to two different name nodes, which means the first node
will not satisfy the invariant 'n.Sym().Def.(*ir.Name) == n' (which is
the assertion in this issue).

Fixes #47896

Change-Id: I1e7ae1efd077a83c7878b4342feb6d28d52476cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/344609
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2021-08-24 00:01:29 +00:00
Dan Scales be1a693477 cmd/compile: fixes for non-constant Sizeof/Alignof/Offsetof
Includes Robert's suggested fix in validate.go to not fail on
non-constant alignof/offsetof/sizeof calls. Further changes to wait on
transforming these calls until stenciling time, when we can call
EvalConst() to evaluate them once all the relevant types are known.

Added a bunch of new tests for non-constant Sizeof/Alignof/Offsetof.

Fixes #47716

Change-Id: I469af888eb9ce3a853124d919eda753971009b3e
Reviewed-on: https://go-review.googlesource.com/c/go/+/344250
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2021-08-23 22:55:34 +00:00
Keith Randall 8486ced8b0 cmd/compile: copy captured dictionary var to local var
When starting a closure that needs a dictionary, copy the closure
variable to a local variable. This lets child closures capture that
dictionary variable correctly.

This is a better fix for #47684, which does not cause problems
like #47723.

Fixes #47723
Update #47684

Change-Id: Ib5d9ffc68a5142e28daa7d0d75683e7a35508540
Reviewed-on: https://go-review.googlesource.com/c/go/+/343871
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2021-08-23 17:51:41 +00:00
Dan Scales f457ecc7f0 cmd/compile: fixing 15.go for -G=3
Required two changes:

 - avoid creating a closure in the case where the actual receiver of an
   embedded method is not generic even though the base operand of the
   selector is generic. This is similar to the test suggested by wayne
   zuo - I thought it was clear in buildClosure, and easier to comment.

 - Propagate //go:nointerface to base generic methods and then to
   instantiations.

Change-Id: If30c834e4223c2639b7f7e74d44e6087aa9ccd76
Reviewed-on: https://go-review.googlesource.com/c/go/+/344251
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2021-08-23 16:57:27 +00:00
Keith Randall 687f2acf6a cmd/compile: only use dictionaries for conversions to type parameters
Conversions to regular concrete types should not be rewritten during
stenciling.

Fixes #47740

Change-Id: I2b45e22f962dcd2e18bd6cc876ebc0f850860822
Reviewed-on: https://go-review.googlesource.com/c/go/+/342989
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2021-08-18 22:34:31 +00:00
Dan Scales b7b790a71a cmd/compile: fix CONVIFACE case converting interface to empty interface
We need an extra case in convertToDictionary. In the case of an operand
which is an interface and converting to an empty interface, we don't
want to get the run-time type from the dictionary (which would be the
run-time type of the interface). We want to do a type-assert to the
empty interface.

Change-Id: I414247210168153151272fab198bfe82ad7b1567
Reviewed-on: https://go-review.googlesource.com/c/go/+/342009
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2021-08-17 13:23:13 +00:00
Keith Randall 2fbf6aafe7 [dev.typeparams] cmd/compile: handle interface type parameters in type switches
Change-Id: I9bba21a64d7e9f42395b6fcdf8aa3ca01cf131dc
Reviewed-on: https://go-review.googlesource.com/c/go/+/340912
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2021-08-10 01:56:50 +00:00
Dan Scales 9f4d6a8359 [dev.typeparams] cmd/compile: call transformArgs before early typecheckaste in noder
In the cases where we do an early call to typecheckaste() in noder to
expose CONVIFACE nodes, we need a preceding call to transformArgs().
This is needed to allow typecheckaste() to run correctly, in the case of
f(g()), where g has multiple return values.

I also cleaned up the code a bit and commented the code in Call(), and
we do the call to typecheckaste() in several more cases.

In stencil.go:stencil(), I moved the transformCall earlier for the
OCALLMETH/ODOTMETH case, just as I did in my previous CL for
OCALL/OFUNCINST. By doing this, transformArgs no longer needs to deal
with the extra dictionary args. Therefore, I was able to simply
transformArgs() to look like typecheckargs() again, and make use of
RewriteMultiValue directly.

Updates #47514

Change-Id: I49eb82ac05707e50c2e2fb03e39458a70491d406
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2021-08-09 19:43:09 +00:00
Keith Randall ca3c6985cd [dev.typeparams] cmd/compile: implement generic type switches
Add a new dynamicType node, which is used as a case entry when
the type being switched to is generic.

Change-Id: Ice77c6f224b8fdd3ff574fdf4a8ea5f6c7ddbe75
Reviewed-on: https://go-review.googlesource.com/c/go/+/339429
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2021-08-09 18:41:45 +00:00
Dan Scales 5e33d11e10 [dev.typeparams] cmd/compile: do transformCall with non-shape type of call
Do the transformCall using the original types2-derived type of the call
(in particular, the types of the params as non-shapes). Currently, since
we were using the param types of the instantiation, we might add in
interface conversions to an interface with shapes in the one case of a
full-instantiated generic call. So, we do the transformCall() before
installing the shaped-based instantiation. transformCall() works
correctly even in the case of OCALL/FUNCINST.

Fixed two related bugs:
  - Fixed case where we still were not correctly substituting the types
    for a function instantiation.
  - The type substituter needs to copy field flags while substituting in
    tstruct.

Change-Id: I14e960737d6840a75846ede480e6650534ba3af3
Reviewed-on: https://go-review.googlesource.com/c/go/+/340259
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2021-08-06 19:13:56 +00:00
Dan Scales 5dcb5e2cea [dev.typeparams] cmd/compile: dictionary/shape cleanup
- Removed gcshapeType - we're going with more granular shapes for now, and gradually
   coarsening later if needed.

 - Put in early return in getDictionarySym(), so the entire rest of the
   function can be un-indented by one level.

 - Removed some duplicated infoprint calls, and fixed one infoprint
   message in getGfInfo.

Change-Id: I13acce8fdabdb21e903275b53ff78a1e6a378de2
Reviewed-on: https://go-review.googlesource.com/c/go/+/339901
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2021-08-05 17:53:59 +00:00
Dan Scales 3cdf8b429e [dev.typeparams] cmd/compile: fixing case where type arg is an interface
In this case, we can't use an itab for doing a bound call, since we're
converting from an interface to an interface. We do a static or dynamic
type assert in new function assertToBound().

The dynamic type assert in assertToBound() is only needed if a bound is
parameterized. In that case, we must do a dynamic type assert, and
therefore need a dictionary entry for the type bound (see change in
getGfInfo). I'm not sure if we can somehow limit this case, since using
an interface as a type arg AND having the type bound of the type
arg be parameterized is a very unlikely case.

Had to add the TUNION case to parameterizedBy1() (which is only used for
extra checking).

Added a bunch of these test cases to 13.go, which now passes.

Change-Id: Ic22eed637fa879b5bbb46d36b40aaad6f90b9d01
Reviewed-on: https://go-review.googlesource.com/c/go/+/339898
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2021-08-05 17:33:41 +00:00
Dan Scales e56234a305 [dev.typeparams] cmd/compile: simple shape cleanups
- Changed some early returns to asserts (instantiateMethods and Shapify
   should never take a shape arg)

 - Added suggested change (by Ingo) to use copy() in getInstantiation()

 - Clarified that shape types never have methods in Shapify(), removed
   some TODO comments.

Change-Id: Ia2164ffe670a777f7797bbb45c7ef5e6e9e15357
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2021-08-02 21:26:07 +00:00
Dan Scales 35dbdda2fe [dev.typeparams] cmd/compile: remove remaining uses of Unshapify
The other uses of Unshapify were really only there to allow for the
dictionary checking code at the beginning of generic functions/methods.
But that will go away as soon as we start combining real shapes. If we
get rid of that code, we can get rid of the unshapify calls elsewhere.

The only tricky part is that getInstantiation now gets targs that may each
either be a shape or concrete type, and it must translate any concrete
types to shapes, while leaving the already existing shapes.

Change-Id: Ib2b9072b921f8e064958548a1078d82f1d040c9f
Reviewed-on: https://go-review.googlesource.com/c/go/+/338289
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2021-07-29 22:15:33 +00:00
Dan Scales 600b7b431b [dev.typeparams] cmd/compile: handle meth expressions on typeparams
Rewrite a method expression such as 'T.String' (where T is type param
and String is part of its type bound Stringer) as:

func(rcvr T, other params...) {
    return Stringer(rcvr).String(other params...)
}

New function buildClosure2 to create the needed closure. The conversion
Stringer(rcvr) uses the dictionary in the outer function.

For a method expression like 'Test[T].finish' (where finish is a method
of Test[T]), we can already deal with this in buildClosure(). We just
need fix transformDot() to allow the method lookup to fail, since shapes
have no methods on them. That's fine, since for any instantiated
receiver type, we always use the methods on the generic base type.

Also removed the OMETHEXPR case in the main switch of node(), which
isn't needed any (and removes one more potential unshapify).

Also, fixed two small bugs with handling closures that have generic
params or generic captured variables. Need to set the instInfo for the
closure in the subst struct when descending into a closure during
genericSubst() and was missing initializing the startItabConv and gfInfo
fields in the closure info.

Change-Id: I6dadedd1378477936a27c9c544c014cd2083cfb7
Reviewed-on: https://go-review.googlesource.com/c/go/+/338129
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2021-07-29 21:58:06 +00:00
Keith Randall f4f503e0a3 [dev.typeparams] cmd/compile: implement generic .(T) operations
Introduce new dynamic dottype operations which take a dynamic
instead of static type to convert to.

Change-Id: I5824a1fea056fe811b1226ce059e1e8da1baa335
Reviewed-on: https://go-review.googlesource.com/c/go/+/337609
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2021-07-29 17:15:21 +00:00
Dan Scales e00a6ec084 [dev.typeparams] cmd/compile: mark methods of instantiated interface types as used
Fix the cons.go missing method error. Mark all the methods of
instantiated interface types as used. We could try to record all the
exact methods used for generic interface types, but for now, just mark
all the methods as used so that their methods are not dead-code
eliminated.

Change-Id: I35685eda82476244371379b97691a1b8506ef0f7
Reviewed-on: https://go-review.googlesource.com/c/go/+/337349
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2021-07-28 03:04:12 +00:00
Keith Randall 5d8f90f904 [dev.typeparams] cmd/compile: don't need to unshapify append calls
append is fine using shape types.

Change-Id: Iae829b9b5929d4dc7aa74bed57da13d4f6d746be
Reviewed-on: https://go-review.googlesource.com/c/go/+/337669
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2021-07-27 17:32:52 +00:00
Keith Randall b27c7e30dc [dev.typeparams] cmd/compile: fix HasShape, add dottype test
HasShape needs a TINTER case.

Add a test for x.(T) in various situations. Needs the fix above.

Also remove ONEW unshapify case. It is ok for ONEW to have a shape
type, as it will just be passed to mallocgc, or possibly used as a
stack object type, both of which are ok.

Change-Id: Ibddf8f5c8c254d32cb5ebcaca7dc94b4c00ab893
Reviewed-on: https://go-review.googlesource.com/c/go/+/337231
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2021-07-24 22:49:24 +00:00
Dan Scales 3dc0a0a2c5 [dev.typeparams] cmd/compile: get rid of concretify use for bounds.
We just need to substitute from the typeparams to the shapes for the dst
type of the bound.

Removed concretify substituter, not used anymore. Also removed
shape2params, not needed anymore.

However, since the dst type is now not concrete, this gives more cases
where the linker can't find a method.

I realized that we need to call MarkUsedIfaceMethod to mark a method as
used on a particular interface, else a type's method can be still
deadcoded even though MarkTypeUsedInInterface has been called on the
concrete type. I added a new version MarkUsedIfaceMethodIndex to fit my
use case.

Change-Id: Id67b72b350889dd3688b42739c337d5d79a0d1a2
Reviewed-on: https://go-review.googlesource.com/c/go/+/337230
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2021-07-24 17:47:08 +00:00
Keith Randall 77e0bf294c [dev.typeparams] cmd/compile: introduce OCONVIDATA op
This operation computes just the data field needed to put its argument
into an interface. Used by generics because we produce the type field
of an interface using dictionaries (instead of statically).

With this operation defined, we can now assert that shape types
are never marked as used in interfaces (the only previous use
was IDATA(CONVIFACE(t))).

Change-Id: Idb1eb5f3b238285cb99413d382599c0621b7681a
Reviewed-on: https://go-review.googlesource.com/c/go/+/337109
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Keith Randall 6992dcdad9 [dev.typeparams] cmd/compile: fix some issues with cons.go
Add a test to make sure there's no invalid OCONVIFACEs when stenciling is done.

Use concrete types for the type of DOTTYPE and DOTTYPE2.

MarkTypeUsedInInterface - should we allow types with shape types
underneath? I think the itab CL will help with this (at least, for
a remaining cons.go issue).

Change-Id: I2c96d74e8daaca26cadc84ea94abb9a27c0bb240
Reviewed-on: https://go-review.googlesource.com/c/go/+/337069
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2021-07-23 23:44:49 +00:00
Dan Scales 02c0172500 [dev.typeparams] cmd/compile: add dictionary entries for itab conversion
This fix the case where a type param or derived type is converted to a
non-empty interface. Previously, we were converting to an empty
interface and then using DOTTYPE to convert to the correct non-empty
interface. In that case, we can get the needed itab directly from the
dictionary. This is needed for correctness from shapes, if the
destination interface is parameterized, else we will incorrectly convert
to the shape version of the interface.

Creating/writing an itab can involve generating wrappers for a bunch of
methods, which may use dictionaries. So, all the
dictionaries/instantiations are being generated on the fly and have
recursive relationships, it is simplest to finish creating/writing the
itabs at the end of the stenciling phase. So, we create a list of the
dictionaries which need to be completed by writing out their itab
entries.

The existing tests ordered.go, ifaceconv.go, and issue44688.go make use
of this optimization.

Got itab conversions for bound calls working, except for 13.go.
Also, want to get rid of the concretify, but I think we need more info
on the Bound from types2.

Change-Id: If552958a7b8a435500d6cc42c401572c367b30d1
Reviewed-on: https://go-review.googlesource.com/c/go/+/336993
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2021-07-23 21:16:54 +00:00
Dan Scales 12866bd8ea [dev.typeparams] Add CONVIFACE nodes in noder2, where possible
Changes to add CONVIFACE nodes where possible in noder2, even when the
args are typeparams. The transformation to insert a CONVIFACE node can
usually happen when there an obvious assignment/conversion to an
interface type from a non-interface type. So, we now do this
tranformation for:

 - direct conversions to an interface type

 - function arguments that are implicitly converted to an interface
   based on the parameter types.

 - EQ/NE comparison of an interface and a non-interface

With this change, we can remove some special case checks for CONVIFACE
nodes after transformation in node(), and instead just have the one
check in the CONVIFACE check.

Change-Id: I7cf2ef920aebf9e5553210aeaf19f344e128ca62
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2021-07-23 20:57:41 +00:00
Keith Randall 5cb84f0604 [dev.typeparams] cmd/compile: make sure types added to the dictionary are instantiated correctly
Make sure the instantiating types are the type parameters of the containing
function (or types derived from those).

The one exception is the argument of a OFUNCINST, whose type
parameters are those of the declaration site of the function or method
being instantiated. We skip those types.

Change-Id: I4b3ff22eb8a81a76476930cf8ed2a7dd6489d8b8
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2021-07-22 18:09:49 +00:00
Dan Scales ee20dff27d [dev.typeparams] Get dictionaryCapture.go working.
METHVALUE in a generic function (that is not called) was not causing
buildClosure() to be called and therefore not using dictionaries. Also,
had to add an extra check to make sure that if we have a FUNCINST
node above a METHVALUE, we only call buildClosure once.

Change-Id: I49756152fc343e5ac1c449e697960fc2a0f482ae
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2021-07-22 04:44:48 +00:00
Dan Scales f19e49e7b1 [dev.typeparams] cmd/compile: added a builtins.go test, fixed one bug
The builtins.go test is derived from
cmd/compile/internal/types2/testdata/check/builtins.go2, after removing
the error cases.  Added a few extra tests for len/cap/append.

Fixed one bug, which is that DELETE operations can't be transformed if
their argument is a typeparam. Also, the tranform of LEN/CAP calls does
not need to be delayed. Removed out-date references to the old
typechecker in the comments.

Change-Id: If7a21506a7ff63ff7c8e87ccd614ef4ff3a0d3c8
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2021-07-21 21:25:20 +00:00
Keith Randall e6a2cf233f [dev.typeparams] cmd/compile: get runtime stuff working
Remaining stuff from Dan's CL 335412 to get tests passing.

 - Removed PTRLIT case in node() that was added with the gcshape change.
   I don't think it is needed anymore.

 - Modified (*itab).init() to add an irrelevant pointer (the itab
   itself) for the '==' entry of interfaces with 'comparable'. That
   entry is not used, so we just want to avoid the error that the given
   type doesn't actually have an '==' method.

Change-Id: I9b2d4c8342c0b2048d76e003d95023f4ccd559f5
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2021-07-21 21:06:02 +00:00
Keith Randall 4a97fe8c22 [dev.typeparams] cmd/compile: avoid adding incorrectly instantiated types to the dictionary
FUNCINST nodes aren't instantiated correctly. Skip those types when
adding to the set of types considered for the dictionary.  Those types
include those which are uninstantiated(have tparams), and those with
type parameters that aren't a parameter of the containing function
(they are the type parameter of the function being called).

Allow func types to be put in the dictionary.

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2021-07-21 21:05:50 +00:00