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11 Commits

Author SHA1 Message Date
Nate Chandler
8d8577e5b0 [SIL] Removed Indirect_In_Constant convention. 
It is no different from @in.

Continue parse @in_constant in textual and serialized SIL, but just as
an alias for @in.
 2022-12-09 21:54:00 -08:00
Erik Eckstein
0ada6ec5bd SIL SideEffects: handle program termination point functions 
We can ignore any memory writes in a program termination point, because it's not relevant for the caller.
But we need to consider memory reads, otherwise preceeding memory writes would be eliminated by dead-store-elimination in the caller.
E.g. String initialization for error strings which are printed by the program termination point.
Regarding ownership: a program termination point must not touch any reference counted objects.
 2022-11-09 08:06:19 +01:00
Erik Eckstein
8961e2982e swift side effects: some additions and refactoring 
add `Function.getSideEffects(forArgument:,atIndex:,withConvention:)`
 2022-10-20 09:20:28 +02:00
Erik Eckstein
0a2d233d1e compute effects: Don't modify the effects if they didn't change 
This avoids sending a change notification which can trigger unnecessary other invalidations.
 2022-10-20 09:20:28 +02:00
Nate Chandler
4476088ab5 [ComputeSideEffects] Track deinit-barrier-ness. 
Functions "are deinit barriers" (more pedantically, applies of functions
are deinit barriers) if any of their instructions are deinit barriers.
During side-effect analysis, when walking a function's instructions for
other global effects, also check for the deinit-barrier effect.  If an
instruction is found to be a deinit barrier, mark the function's global
effects accordingly.

Add SILFunction::isDeinitBarrier to conveniently access the effects
computed during ComputeSideEffects.

Update the isBarrierApply predicate to iterate over the list of callees,
if complete, to check whether any is a deinit barrier.  If none is, then
the apply is not a deinit barrier.
 2022-10-18 21:23:22 -07:00
Erik Eckstein
66f07fe3da Swift SIL: rework function effects and add function side-effects 
So far, function effects only included escape effects.
This change adds side-effects (but they are not computed, yet).
It also involves refactoring of the existing escape effects.
Also the SIL effect syntax changed a bit. Details are in docs/SIL.rst
 2022-10-05 07:38:11 +02:00
Erik Eckstein
8e2e7a73c5 SIL: make argument effects more readable in textual SIL 
So far, argument effects were printed in square brackets before the function name, e.g.
```
sil [escapes !%0.**, !%1, %1.c*.v** => %0.v**] @foo : $@convention(thin) (@guaranteed T) -> @out S {
bb0(%0 : $*S, %1 : @guaranteed $T):
...
```

As we are adding more argument effects, this becomes unreadable.
To make it more readable, print the effects after the opening curly brace, and print a separate line for each argument. E.g.
```
sil [ossa] @foo : $@convention(thin) (@guaranteed T) -> @out S {
[%0: noescape **]
[%1: noescape, escape c*.v** => %0.v**]
bb0(%0 : $*S, %1 : @guaranteed $T):
...
```
 2022-09-12 09:14:54 +02:00
Erik Eckstein
024ec094d1 Swift SIL: simplify the representation of argument effects 
Just refactoring, it's a NFC.
 2022-09-09 21:50:10 +02:00
Erik Eckstein
1c4ba46c3b EscapeInfo: fix a bug and some refactoring 
Add a flag `analyzeAddresses` for distinguishing address vs value escape analysis. This is simpler than handling that in the visitUse/visitDef closures.
Also, fix a related bug, which let an address, which is escaping to a function, get unnoticed.
 2022-04-25 08:56:24 +02:00
Josh Soref
d767912be2 Spelling sil (#42471) 
* spelling: accessible

Signed-off-by: Josh Soref <jsoref@users.noreply.github.com>

* spelling: accessories

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* spelling: compatible

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* spelling: compilation

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* spelling: completely

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* spelling: conversion

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* spelling: determined

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* spelling: different

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* spelling: doesn't

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* spelling: equivalent

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* spelling: formation

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* spelling: global

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* spelling: guaranteed

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* spelling: identify

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* spelling: inaccessible

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* spelling: indices

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* spelling: inefficient

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* spelling: inheritance

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* spelling: instruction

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* spelling: intentionally

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* spelling: interior

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* spelling: intrinsic

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* spelling: introducing

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* spelling: irrelevant

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* spelling: message

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* spelling: multi

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* spelling: necessarily

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* spelling: object

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* spelling: one

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* spelling: optimization

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* spelling: otherwise

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* spelling: overridden

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* spelling: parameter

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* spelling: pipeline

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* spelling: possibility

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* spelling: postdominance

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* spelling: providing

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* spelling: reached

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* spelling: recognized

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* spelling: refrigerator

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* spelling: remaining

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* spelling: resilient

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* spelling: retrieve

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* spelling: scavenge

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* spelling: scheduled

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* spelling: separately

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* spelling: serializable

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* spelling: signature

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* spelling: simplicity

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* spelling: specifically

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* spelling: substituted

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* spelling: subtypes

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* spelling: supplement

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* spelling: syntax

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* spelling: this

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* spelling: though

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* spelling: through

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* spelling: transitively

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* spelling: transpose

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* spelling: trivial

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* spelling: value

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* spelling: verification

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* spelling: visibility

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* spelling: weird

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* spelling: whole

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Co-authored-by: Josh Soref <jsoref@users.noreply.github.com>
 2022-04-22 15:11:09 -07:00
Erik Eckstein
f09dfc93a9 Swift SIL: escape effects for function arguments. 
Store a list of argument effects in a function, which specify if and how arguments escape.
Such effects can be specified in the Swift source code (for details see docs/ReferenceGuides/UnderscoredAttributes.md) or derived in an optimization pass.

For details see the documentation in SwiftCompilerSources/Sources/SIL/Effects.swift.
 2022-01-25 11:29:44 +01:00