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SIL: let Type.getNominalFields return nil for a struct with unreferenceable storage #82140

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Merged
merged 1 commit into from
Jun 10, 2025
Merged

SIL: let Type.getNominalFields return nil for a struct with unreferenceable storage #82140

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3 changes: 3 additions & 0 deletions SwiftCompilerSources/Sources/SIL/Type.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -159,6 +159,9 @@ public struct Type : TypeProperties, CustomStringConvertible, NoReflectionChildr
guard let nominal = nominal, !nominal.isResilient(in: function) else {
return nil
}
if let structDecl = nominal as? StructDecl, structDecl.hasUnreferenceableStorage {
return nil
}
return NominalFieldsArray(type: self, function: function)
}

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7 changes: 7 additions & 0 deletions test/SILOptimizer/Inputs/bitfield.h
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Expand Up @@ -3,3 +3,10 @@ struct S {
int a;
int b : 8;
};

struct S2 {
int a;
int :4;
int b;
};

1 change: 1 addition & 0 deletions test/SILOptimizer/global_init_opt.swift
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Expand Up @@ -9,6 +9,7 @@ var gg: Int = {

// Test that the compiler doesn't crash with a global C bitfield.
var bitfield = S(a: 0, b: 0)
var bitfield2 = S2(a: 0, b: 0)

// CHECK-LABEL: sil @$s4test3cseSiyF
// CHECK: builtin "once"
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