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[AutoDiff] Add differentiability kind to differentiability witnesses and mangle them.

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Differentiability witnesses are now keyed by the original function name, the differentiability kind, and the autodiff config.

Updated SIL syntax:
```
differentiability-kind ::= 'forward' | 'reverse' | 'normal' | 'linear'
sil-differentiability-witness ::=
    'sil_differentiability_witness'
    sil-linkage?
    '[' differentiability-kind ']'
    '[' 'parameters' sil-differentiability-witness-function-index-list ']'
    '[' 'results' sil-differentiability-witness-function-index-list ']'
    generic-parameter-clause?
    sil-function-name ':' sil-type
    sil-differentiability-witness-body?
sil-instruction ::=
    'differentiability_witness_function'
    '[' sil-differentiability-witness-function-kind ']'
    '[' differentiability-kind ']'
    '[' 'parameters' sil-differentiability-witness-function-index-list ']'
    '[' 'results' sil-differentiability-witness-function-index-list ']'
    generic-parameter-clause?
    sil-function-name ':' sil-type
```
```console
sil_differentiability_witness [reverse] [parameters 0 1] [results 0] <T where T: Differentiable> @foo : <T> $(T) -> T
differentiability_witness_function [vjp] [reverse] [parameters 0] [results 0] <T where T: Differentiable> @foo : $(T) -> T
```

New mangling:
```swift
  global ::= global generic-signature? 'WJ' DIFFERENTIABILITY-KIND INDEX-SUBSET 'p' INDEX-SUBSET 'r' // differentiability witness
```
```console
$s13test_mangling3fooyS2f_S2ftFWJrSpSr ---> reverse differentiability witness for test_mangling.foo(Swift.Float, Swift.Float, Swift.Float) -> Swift.Float with respect to parameters {0} and results {0}
```

Resolves rdar://74380324.
This commit is contained in:
Richard Wei
2021-02-17 03:15:52 -05:00
parent 37d52fbb16
commit e494df2ee6
53 changed files with 618 additions and 290 deletions
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3
lib/Serialization/SerializedSILLoader.cpp
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@@ -132,7 +132,8 @@ SILDifferentiabilityWitness *
SerializedSILLoader::lookupDifferentiabilityWitness(
SILDifferentiabilityWitnessKey key) {
Mangle::ASTMangler mangler;
std::string mangledKey = mangler.mangleSILDifferentiabilityWitnessKey(key);
auto mangledKey = mangler.mangleSILDifferentiabilityWitness(
key.originalFunctionName, key.kind, key.config);
// It is possible that one module has a declaration of a
// SILDifferentiabilityWitness, while another has the full definition.
SILDifferentiabilityWitness *dw = nullptr;