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Raphael Isemann
b772384527
`CompletedDebugTypeInfo::getFromTypeInfo` currently uses the storage type as
the preferred source of size information.
For address-only types (and any other type that has no fixed size at compile
time), the storage type is always changed to a pointer.
This currently causes that some non-fixed-size types (e.g., generics)
are assigned the size of a pointer as their actual size in the generated
debug information.
For example:
```
protocol P {
associatedtype S
}
func foo<B: P>(_ b: B) {
let x: (aaa: Int, bbb: B.S?) = (aaa: 0, bbb: nil)
_ = x
let y: (Fx: Int, Fy: Int) = (Fx: 0, Fy: 0)
_ = y
}
```
results in the following DWARF output where the first struct
is given size 8 (= the size of a pointer).
```
0x000000d4: DW_TAG_structure_type
DW_AT_name ("$sSi3aaa_1S4main1PPQzSg3bbbtD")
DW_AT_linkage_name ("$sSi3aaa_1S4main1PPQzSg3bbbtD")
DW_AT_byte_size (0x08)
DW_AT_APPLE_runtime_class (DW_LANG_Swift)
0x000000f3: DW_TAG_structure_type
DW_AT_name ("$sSi2Fx_Si2FytD")
DW_AT_linkage_name ("$sSi2Fx_Si2FytD")
DW_AT_byte_size (0x10)
DW_AT_APPLE_runtime_class (DW_LANG_Swift)
```
This change modifies `CompletedDebugTypeInfo::getFromTypeInfo` to ignore the
storage size for types that do not have fixed size. Generics now have no
specified size or 0 in DWARF. FixedArray<A, B> without substituted type/size
is now also emitted using the dedicated FixedArray code.
16 lines
509 B
Swift
16 lines
509 B
Swift
// RUN: %target-swift-frontend %s -emit-ir -gdwarf-types -o - | %FileCheck %s
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// Tests that tuples with no known size are not given a size in DWARF.
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protocol Prot {
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associatedtype Associated
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}
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func generic_func<B: Prot>(_ b: B) {
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let x: (first: Int, optionalSecond: B.Associated?) = (first: 0, optionalSecond: nil)
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_ = x
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}
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// CHECK: !DICompositeType(tag: DW_TAG_structure_type, {{.*}}name: "$sSi5first_10Associated18generic_tuple_size4ProtPQzSg14optionalSecondtD"
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// CHECK-NOT: size:
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// CHECK-SAME:) |