Now that CaptureVars is gone, we can remove the extra code in escape
analysis that only served to appease toolstash -cmp.
Change-Id: I8c811834f3d966e76702e2d362e3de414c94bea6
Reviewed-on: https://go-review.googlesource.com/c/go/+/281544
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Capture analysis is now part of escape analysis.
Passes toolstash -cmp.
Change-Id: Ifcd3ecc342074c590e0db1ff0646dfa1ea2ff57b
Reviewed-on: https://go-review.googlesource.com/c/go/+/281543
Trust: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Currently we rely on the type-checker to do some basic data-flow
analysis to help decide whether function literals should capture
variables by value or reference. However, this analysis isn't done by
go/types, and escape analysis already has a better framework for doing
this more precisely.
This CL extends escape analysis to recalculate the same "byval" as
CaptureVars and check that it matches. A future CL will remove
CaptureVars in favor of escape analysis's calculation.
Notably, escape analysis happens after deadcode removes obviously
unreachable code, so it sees the AST without any unreachable
assignments. (Also without unreachable addrtakens, but
ComputeAddrtaken already happens after deadcode too.) There are two
test cases where a variable is only reassigned on certain CPUs. This
CL changes them to reassign the variables unconditionally (as no-op
reassignments that avoid triggering cmd/vet's self-assignment check),
at least until we remove CaptureVars.
Passes toolstash -cmp.
Change-Id: I7162619739fedaf861b478fb8d506f96a6ac21f3
Reviewed-on: https://go-review.googlesource.com/c/go/+/281535
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
The gc implementation has had precise GC for a while now, so we can
enable these tests more broadly.
Confirmed that they still fail with gccgo 10.2.1.
Change-Id: Ic1c0394ab832024a99e34163c422941a3706e1a2
Reviewed-on: https://go-review.googlesource.com/c/go/+/281542
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
In a gccgo installation the standard library sources are not available.
Change-Id: I929f3645e3ac95a1fa7047d6a3d243159a86ba66
Reviewed-on: https://go-review.googlesource.com/c/go/+/281493
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
The backend doesn't synchronize compilation of functions with their
enclosed function literals, so it's not safe to double-check that
IsClosureVar isn't set on the underlying Name. Plenty of frontend
stuff would blow-up if this was wrong anyway, so it should be fine to
omit.
Change-Id: I3e97b64051fe56d97bf316c9b5dcce61f2082428
Reviewed-on: https://go-review.googlesource.com/c/go/+/281812
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
tracebackothers is called from fatal throw/panic.
A fatal throw may be taken with allglock held (notably in the allocator
when allglock is held), which would cause a deadlock in tracebackothers
when we try to take allglock again. Locking allglock here is also often
a lock order violation w.r.t. the locks held when throw was called.
Avoid the deadlock and ordering issues by skipping locking altogether.
It is OK to miss concurrently created Gs (which are generally avoided by
freezetheworld(), and which were possible previously anyways if created
after the loop).
Fatal throw/panic freezetheworld(), which should freeze other threads
that may be racing to modify allgs. However, freezetheworld() does _not_
guarantee that it stops all other threads, so we can't simply drop the
lock.
Fixes#42669
Updates #43175
Change-Id: I657aec46ed35fd5d1b3f1ba25b500128ab26b088
Reviewed-on: https://go-review.googlesource.com/c/go/+/270861
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Trust: Michael Pratt <mpratt@google.com>
There's a bunch of code that wants to map closure variables back to
their original name, so add a single Name.Canonical method that they
can all use.
Also, move the Byval flag from being stored on individual closure
variables to being stored on the canonical variable.
Passes toolstash -cmp.
Change-Id: Ia3ef81af5a15783d09f04b4e274ce33df94518e6
Reviewed-on: https://go-review.googlesource.com/c/go/+/281541
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
ir.StaticValue currently relies on CaptureVars setting Addrtaken for
variables that are assigned within nested function literals. We want
to move that logic to escape analysis, but ir.StaticValue is used in
inlining and devirtualization, which happen before escape
analysis.
The long-term solution here is to generalize escape analysis's precise
reassignment tracking for use by other optimization passes, but for
now we just generalize ir.StaticValue to not depend on Addrtaken
anymore. Instead, it now also pays attention to OADDR nodes as well as
recurses into OCLOSURE bodies.
Passes toolstash -cmp.
Change-Id: I6114e3277fb70b235f4423d2983d0433c881f79f
Reviewed-on: https://go-review.googlesource.com/c/go/+/281540
Trust: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
For OINDEX expressions, ir.OuterValue depends on knowing the indexee's
type. Rather than silently acting as though it's not an array, make it
loudly fail.
The only code that needs to be fixed to support this is checkassign
during typechecking, which needs to avoid calling ir.OuterValue now if
typechecking the assigned operand already failed.
Passes toolstash -cmp.
Change-Id: I935cae0dacc837202bc6b63164dc2f0a6fde005c
Reviewed-on: https://go-review.googlesource.com/c/go/+/281539
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
CaptureVars is responsible for deciding whether free variables should
be captured by value or by reference, but currently it also makes up
for some of the short-comings of the frontend symbol resolution /
type-checking algorithms. These are really separate responsibilities,
so move the latter into type-checking where it fits better.
Passes toolstash -cmp.
Change-Id: Iffbd53e83846a9ca9dfb54b597450b8543252850
Reviewed-on: https://go-review.googlesource.com/c/go/+/281534
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Dump uses reflection to print IR nodes, and it only knew how to print
out the Nodes slice type itself. This CL adds support for printing any
slice whose element type implements Node, such as SwitchStmt and
SelectStmt's clause lists.
Change-Id: I2fd8defe11868b564d1d389ea3cd9b8abcefac62
Reviewed-on: https://go-review.googlesource.com/c/go/+/281537
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
These aren't part of the Node interface anymore, so no need to keep
them around.
Passes toolstash -cmp.
[git-generate]
cd src/cmd/compile/internal/ir
: Fix one off case that causes trouble for rf.
sed -i -e 's/n.SetClass(ir.PAUTO)/n.Class_ = ir.PAUTO/' ../ssa/export_test.go
pkgs=$(go list . ../...)
rf '
ex '"$(echo $pkgs)"' {
var n *Name
var c Class
n.Class() -> n.Class_
n.SetClass(c) -> n.Class_ = c
}
rm Name.Class
rm Name.SetClass
mv Name.Class_ Name.Class
'
Change-Id: Ifb304bf4691a8c455456aabd8aa77178d4a49500
Reviewed-on: https://go-review.googlesource.com/c/go/+/281294
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
When exporting signature types, we include the originating package,
because it's exposed via go/types's API. And as a consistency check,
we ensure that the parameter names came from that same package.
However, we were getting this wrong in the case of exported variables
that were initialized with a method value using an imported method. In
this case, when we created the method value wrapper function's
type (which is reused as the variable's type if none is explicitly
provided in the variable declaration), we were reusing the
original (i.e., imported) parameter names, but the newly created
signature type was associated with the current package instead.
The correct fix here is really to preserve the original signature
type's package (along with position and name for its parameters), but
that's awkward to do at the moment because the DeclFunc API requires
an ir representation of the function signature, whereas we only
provide a way to explicitly set packages via the type constructor
APIs.
As an interim fix, we associate the parameters with the current
package, to be consistent with the signature type's package.
Fixes#43479.
Change-Id: Id45a10f8cf64165c9bc7d9598f0a0ee199a5e752
Reviewed-on: https://go-review.googlesource.com/c/go/+/281292
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
It's an error to call Int64Val on constants that don't fit into
int64. CL 272654 made the compiler stricter about detecting misuse,
and revealed that we were using it improperly in detecting consecutive
integer-switch cases. That particular usage actually did work in
practice, but it's easy and best to just fix it.
Fixes#43480.
Change-Id: I56f722d75e83091638ac43b80e45df0b0ad7d48d
Reviewed-on: https://go-review.googlesource.com/c/go/+/281272
Trust: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
So we can remove Name.CloneName now.
Passes toolstash -cmp.
Change-Id: I63e57ba52a7031e06fe9c4ee9aee7de6dec70792
Reviewed-on: https://go-review.googlesource.com/c/go/+/281312
Trust: 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: Go Bot <gobot@golang.org>
In inl.go, that code path is unused, since we added ir.BasicLit to
represent unnamed OLITERALs.
In race.go, rather than cloning ir.RegFP, we can just create it from
scratch again.
Passes toolstash -cmp (incl. w/ -race).
Change-Id: I8e063e4898d2acf056ceca5bc03df6b40a14eca9
Reviewed-on: https://go-review.googlesource.com/c/go/+/281192
Trust: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
After the previous cleanup/optimization CLs, ascompatee now correctly
handles map assignments too. So remove the code from order.mapAssign,
which causes us to assign to the map at the wrong point during
execution. It's not every day you get to fix an issue by only removing
code.
Thanks to Cuong Manh Le for test cases and continually following up on
this issue.
Passes toolstash -cmp. (Apparently the standard library never uses
tricky map assignments. Go figure.)
Fixes#23017.
Change-Id: Ie0728103d59d884d00c1c050251290a2a46150f9
Reviewed-on: https://go-review.googlesource.com/c/go/+/281172
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
After the previous two optimization CLs, this code path now generates
the same code as ascompatee does anyway. So just use that and remove
some redundant code.
Passes toolstash -cmp.
Change-Id: I5e2e5c6dbea64d8e91abe0f2cf51aa5bb86576d2
Reviewed-on: https://go-review.googlesource.com/c/go/+/281154
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Instead of evaluating all result expressions up front and then
assigning them to their result destinations, we can interleave
evaluation with assignment. This reduces how much temporary
stack/register space is needed to hold the values in flight.
Doesn't pass toolstash -cmp, because it allows better return statement
code to be generated. E.g., cmd/go's text segment on linux/ppc64le
shrinks another 1kB.
Change-Id: I3fe889342c80e947e0118704ec01f1682c577e6e
Reviewed-on: https://go-review.googlesource.com/c/go/+/281153
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
order.go has already ordered function calls, so ascompatee only needs
to worry about expressions that might access a variable after it's
already been re-assigned. It already handles this, so the safeExpr
calls simply result in unnecessarily pessimistic code.
Does not pass toolstash -cmp, because it allows more efficient code
generation. E.g., cmd/go on linux/ppc64le is about 2kB smaller.
Change-Id: Idde0588eabe7850fa13c4e281fc46bbeffb4f68c
Reviewed-on: https://go-review.googlesource.com/c/go/+/281152
Trust: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Just de-duplicating some logic and adding better comments.
Passes toolstash -cmp.
Change-Id: I15ec07070510692c6d4367880bc3d2d9847370ab
Reviewed-on: https://go-review.googlesource.com/c/go/+/281132
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
After the previous commit, we no longer access Walkdef on anything but
ir.Names, so we can remove them from the Node interface and miniNode.
The flag bits storage should also move from miniNode.bits to
Name.flags, but the latter is already full at the moment. Leaving as a
TODO for now.
Passes toolstash -cmp.
Change-Id: I2427e4cf7bc68dc1d1529f40fb93dd9f7a9149f6
Reviewed-on: https://go-review.googlesource.com/c/go/+/281005
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
We only actually care about ir.Names in typecheckdef, so don't bother
calling it on anything else. Allows us to get rid of some more
superfluous .Name() calls and .(*ir.Name) assertions.
Passes toolstash -cmp.
Change-Id: I78c7cb680178991ea185958b47a36f101d4d5ef7
Reviewed-on: https://go-review.googlesource.com/c/go/+/281004
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
To do closure conversion during escape analysis, we need to walk the
AST in order. So this CL makes a few changes:
1. Function literals are walked where they appear in their enclosing
function, rather than as independent functions.
2. Walking "range" and "switch" statements is reordered to visit the
X/Tag expression up front, before the body.
3. Most assignments are refactored to use a new assignList helper,
which handles 1:1, 2:1, and N:N assignments. N:1 function call
assignments are still handled directly by the OAS2FUNC case.
4. A latent missed-optimization in escape.addr is fixed: the
ONAMEOFFSET case was failing to update k with the result of calling
e.addr(n.Name_). In partice, this probably wasn't an issue because
ONAMEOFFSET is likely only used for PEXTERN variables (which are
treated as heap memory anyway) or code generated by walk (which has
already gone through escape analysis).
5. Finally, don't replace k with discardHole at the end of
escape.addr. This is already handled at the start of escape.expr, and
we'll want to be able to access the hole's location after escape.expr
returns.
Passes toolstash -cmp.
Change-Id: I2325234346b12b10056a360c489692bab8fdbd93
Reviewed-on: https://go-review.googlesource.com/c/go/+/281003
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Just "=". It's cleaner.
Passes toolstash -cmp.
[git-generate]
cd src/cmd/compile/internal/ir
pkgs=$(go list . ../...)
rf '
ex '"$(echo $pkgs)"' {
var l Nodes
var p *Nodes
p.Set(l) -> *p = l
}
ex '"$(echo $pkgs)"' {
var n InitNode
var l Nodes
*n.PtrInit() = l -> n.SetInit(l)
}
rm Nodes.Set
'
Change-Id: Ic97219792243667146a02776553942ae1189ff7d
Reviewed-on: https://go-review.googlesource.com/c/go/+/281002
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
This CL separates out PtrInit and SetInit into a new InitNode
extension interface, and adds a new TakeInit helper function for
taking and clearing the Init list (if any) from a Node.
This allows removing miniNode.SetInit and miniNode.PtrInit, which in
turn allow getting rid of immutableEmptyNodes, and will allow
simplification of the Nodes API.
It would be nice to get rid of the default Init method too, but
there's way more code that expects to be able to call that at the
moment, so that'll have to wait.
Passes toolstash -cmp.
Change-Id: Ia8c18fab9555b774376f7f43eeecfde4f07b5946
Reviewed-on: https://go-review.googlesource.com/c/go/+/281001
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
What a year it has been. If there's one thing we can count on
at a time like this, it's that 2021 is the Year of the Gopher.
Change-Id: I4f6fbbe3d9b4b70df8fadd0d18237f05cd572265
Reviewed-on: https://go-review.googlesource.com/c/go/+/280163
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
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Reviewed-by: Alberto Donizetti <alb.donizetti@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Passes toolstash -cmp.
[git-generate]
cd src/cmd/compile
rf '
ex . '"$(printf '%s\n' ./internal/* | paste -sd' ')"' {
type T interface{}
var t T
strict t
t.(T) -> t
}
'
cd internal/ir
go generate
Change-Id: I492d50390e724a7216c3cd8b49d4aaf7d0c335da
Reviewed-on: https://go-review.googlesource.com/c/go/+/280716
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
When deciding whether a captured variable can be passed by value, the
compiler is sensitive to the order that the OCLOSURE node is
typechecked relative to the order that the variable is passed to
"checkassign". Today, for an assignment like:
q, g = 2, func() int { return q }
we get this right because we always typecheck the full RHS expression
list before calling checkassign on any LHS expression.
But I nearly made a change that would interleave this ordering,
causing us to call checkassign on q before typechecking the function
literal. And alarmingly, there weren't any tests that caught this.
So this commit adds one.
Change-Id: I66cacd61066c7a229070861a7d973bcc434904cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/280998
Trust: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
In a future CL, I plan to change escape analysis to walk function
literal bodies at the point they appear within the AST, rather than
separately as their own standalone function declaration. This means
escape analysis's AST-walking code will become reentrant.
To make this easier to get right, this CL splits escape analysis's
state into two separate types: one that holds all of the state shared
across the entire batch, and another that holds only the state that's
used within initFunc and walkFunc.
Incidentally, this CL reveals that a bunch of logopt code was using
e.curfn outside of the AST-walking code paths where it's actually set,
so it was always nil. That code is in need of refactoring anyway, so
I'll come back and figure out the correct values to pass later when I
address that.
Passes toolstash -cmp.
Change-Id: I1d13f47d06f7583401afa1b53fcc5ee2adaea6c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/280997
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Closures have their own ONAMEs for captured variables, which their
function bodies refer to. So during inlining, we need to account for
this and ensure the references still work.
The previous inlining handled this by actually declaring the variables
and then either copying the original value or creating a pointer to
them, as appropriate for variables captured by value or by reference.
But this is needlessly complicated. When inlining the function body,
we need to rewrite all variable references anyway. We can just detect
closure variables and change them to directly point to the enclosing
function's version of this variable. No need for copying or further
indirection.
Does not pass toolstash -cmp. Presumably because we're able to
generate better code in some circumstances.
Change-Id: I8f0ccf7b098f39b8cd33f3bcefb875c8132d2c62
Reviewed-on: https://go-review.googlesource.com/c/go/+/280996
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
The previous code was way overcomplicating things. To find out if a
variable is a closure pseudo-variable, one only needs to check
IsClosureVar. Checking Captured and Byval are only meant to be used by
closure conversion.
Passes toolstash -cmp.
Change-Id: I22622cba36ba7f60b3275d17999a8b6bb7c6719a
Reviewed-on: https://go-review.googlesource.com/c/go/+/280995
Trust: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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We can easily compute this on demand.
Passes toolstash -cmp.
Change-Id: I433d8adb2b1615ae05b2764e69904369a59542c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/280994
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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I keep getting these confused and having to look at how the code
actually uses them.
Change-Id: I86baf22b76e7dddada6830df0fac241092f716bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/280993
Trust: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
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This CL moves the general deadcode-removal pass to before computing
Addrtaken, which allows variables to still be converted to SSA if
their address is only taken in unreachable code paths (e.g., the "&mp"
expression in the "if false" block in runtime/os_linux.go:newosproc).
This doesn't pass toolstash -cmp, because it allows SSA to better
optimize some code.
Change-Id: I43e54acc02fdcbad8eb6493283f355aa1ee0de84
Reviewed-on: https://go-review.googlesource.com/c/go/+/280992
Trust: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
This CL fixes package initialization order by creating the init task
before the general deadcode-removal pass.
It also changes noder to emit zero-initialization assignments (i.e.,
OAS with nil RHS) for package-block variables, so that initOrder can
tell the variables still need initialization. To allow this, we need
to also extend the static-init code to recognize zero-initialization
assignments.
This doesn't pass toolstash -cmp, because it reorders some package
initialization routines.
Fixes#43444.
Change-Id: I0da7996a62c85e15e97ce965298127e075390a7e
Reviewed-on: https://go-review.googlesource.com/c/go/+/280976
Trust: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
More minor reshuffling of passes.
Passes toolstash -cmp.
Change-Id: I22633b3741f668fc5ee8579d7d610035ed57df1f
Reviewed-on: https://go-review.googlesource.com/c/go/+/280975
Trust: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
This commit splits up typecheck.Package and moves the code
elsewhere. The type-checking code is moved into noder, so that it can
eventually be interleaved with the noding process. The
non-type-checking code is moved back into package gc, so that it can
be incorporated into appropriate compiler backend phases.
While here, deadcode removal is moved into its own package.
Passes toolstash -cmp.
[git-generate]
cd src/cmd/compile/internal/typecheck
: Split into two functions.
sed -i -e '/Phase 6/i}\n\nfunc postTypecheck() {' typecheck.go
rf '
# Export needed identifiers.
mv deadcode Deadcode
mv loadsys InitRuntime
mv declareUniverse DeclareUniverse
mv dirtyAddrtaken DirtyAddrtaken
mv computeAddrtaken ComputeAddrtaken
mv incrementalAddrtaken IncrementalAddrtaken
# Move into new package.
mv Deadcode deadcodeslice deadcodeexpr deadcode.go
mv deadcode.go cmd/compile/internal/deadcode
# Move top-level type-checking code into noder.
# Move DeclVars there too, now that nothing else uses it.
mv DeclVars Package noder.go
mv noder.go cmd/compile/internal/noder
# Move non-type-checking code back into gc.
mv postTypecheck main.go
mv main.go cmd/compile/internal/gc
'
cd ../deadcode
rf '
# Destutter names.
mv Deadcode Func
mv deadcodeslice stmts
mv deadcodeexpr expr
'
cd ../noder
rf '
# Move functions up, next to their related code.
mv noder.go:/func Package/-1,$ \
noder.go:/makeSrcPosBase translates/-1
mv noder.go:/func DeclVars/-3,$ \
noder.go:/constState tracks/-1
'
cd ../gc
rf '
# Inline postTypecheck code back into gc.Main.
mv main.go:/func postTypecheck/+0,/AllImportedBodies/+1 \
main.go:/Build init task/-1
rm postTypecheck
'
Change-Id: Ie5e992ece4a42204cce6aa98dd6eb52112d098c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/280974
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Unused variables are a type-checking error, so they should be reported
during typecheck rather than walk.
One catch is that we only want to report unused-variable errors for
functions that type check successfully, but some errors are reported
during noding, so we don't have an easy way to detect that
currently. As an approximate solution, we simply check if we've
reported any errors yet.
Passes toolstash -cmp.
Change-Id: I9400bfc94312c71d0c908a491e85c16d62224c9c
Reviewed-on: https://go-review.googlesource.com/c/go/+/280973
Trust: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
copyExpr just calls copyExpr1 with "clear" is false, so make it return
*ir.Name directly instead of ir.Node
Passes toolstash -cmp.
Change-Id: I31ca1d88d9eaf8ac37517022f1c74285ffce07d3
Reviewed-on: https://go-review.googlesource.com/c/go/+/280714
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Back to pre Russquake, Node.Nbody of OCALL* node is used to attach
variables which must be kept alive during that call.
Now after Russquake, we have CallExpr to represent a function call,
so use a dedicated field for those variables instead.
Passes toolstash -cmp.
Change-Id: I4f40ebefcc7c41cdcc4e29c7a6d8496a083b68f4
Reviewed-on: https://go-review.googlesource.com/c/go/+/280733
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
OTYPE and OMETHEXPR were missing from OpPrec. So add them with the
same precedences as OT{ARRAY,MAP,STRUCT,etc} and
ODOT{,METH,INTER,etc}, respectively. However, ODEREF (which is also
used for pointer types *T) has a lower precedence than other types, so
pointer types need to be specially handled to assign them their
correct, lower precedence.
Incidentally, this also improves the error messages in issue15055.go,
where we were adding unnecessary parentheses around the types in
conversion expressions.
Thanks to Cuong Manh Le for writing the test cases for #43428.
Fixes#43428.
Change-Id: I57e7979babe3ed9ef8a8b5a2a3745e3737dd785f
Reviewed-on: https://go-review.googlesource.com/c/go/+/280873
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
