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Add closure taking write API #75

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merged 2 commits into from
Jan 18, 2024
Merged

Add closure taking write API #75

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2440893
Add closure taking write API
rauhul Jan 13, 2024
e408699
tests/impl
rauhul Jan 18, 2024
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8 changes: 8 additions & 0 deletions Sources/MMIO/Register.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,14 @@ extension Register {
#endif
}

@inlinable @inline(__always)
public func write<T>(_ body: (inout Value.Write) -> (T)) -> T {
var newValue = Value.Write(Value.Raw(0))
let returnValue = body(&newValue)
self.write(newValue)
return returnValue
}

@inlinable @inline(__always) @_disfavoredOverload
public func modify<T>(_ body: (Value.Read, inout Value.Write) -> (T)) -> T {
let value = self.read()
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8 changes: 8 additions & 0 deletions Tests/MMIOFileCheckTests/Tests/TestRegisterWrite.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -50,19 +50,27 @@ let r64 = Register<R64>(unsafeAddress: 0x1000)
public func main8() {
r8.write(unsafeBitCast(0 as UInt8, to: R8.Write.self))
// CHECK: store volatile i8 0
r8.write { $0.raw.hi = 1 }
// CHECK: store volatile i8 -128
}

public func main16() {
r16.write(unsafeBitCast(1 as UInt16, to: R16.Write.self))
// CHECK: store volatile i16 1
r16.write { $0.raw.hi = 1 }
// CHECK: store volatile i16 -32768
}

public func main32() {
r32.write(unsafeBitCast(2 as UInt32, to: R32.Write.self))
// CHECK: store volatile i32 2
r32.write { $0.raw.hi = 1 }
// CHECK: store volatile i32 -2147483648
}

public func main64() {
r64.write(unsafeBitCast(3 as UInt64, to: R64.Write.self))
// CHECK: store volatile i64 3
r64.write { $0.raw.hi = 1 }
// CHECK: store volatile i64 -9223372036854775808
}