Hi all, can any one here give me some pointers on debugging the standard
library?
I may be compiling the toolchain incorrectly when i step through the code
variables on the stack frame are not available.
I think its due to this message when i start the REPL
`libswiftCore.dylib was compiled with optimization - stepping may behave
oddly; variables may not be available.`
I am using the /utils/build-toolchain command and did not touch the
presets.ini file.
Any help is appreciated!
Thanks in advance
Dave
Process 13833 stopped
* thread #1: tid = 0x3a6ffe, 0x00000001000c3603
libswiftCore.dylib`ManagedBufferPointer.init(_uncheckedBufferClass :
AnyObject.Type, minimumCapacity : Int) -> ManagedBufferPointer<A, B>
[inlined] Swift._roundUp (Swift.Int, toAlignment : Swift.Int) -> Swift.Int
at Builtin.swift:72, queue = 'com.apple.main-thread', stop reason = step in
frame #0: 0x00000001000c3603
libswiftCore.dylib`ManagedBufferPointer.init(_uncheckedBufferClass :
AnyObject.Type, minimumCapacity : Int) -> ManagedBufferPointer<A, B>
[inlined] Swift._roundUp (Swift.Int, toAlignment : Swift.Int) -> Swift.Int
at Builtin.swift:72 [opt]
69 @_versioned
70 internal func _roundUp(_ offset: Int, toAlignment alignment: Int) ->
Int {
71 _sanityCheck(offset >= 0)
-> 72 return Int(_roundUpImpl(UInt(bitPattern: offset), toAlignment:
alignment))
73 }
74
75 // This function takes a raw pointer and returns a typed pointer. It
implicitly
(lldb) fr v
(lldb) po offset
error: <EXPR>:3:1: error: use of unresolved identifier 'offset'
offset
^~~~~~
(lldb) fr v offset
error: no variable named 'offset' found in this frame
(lldb) s
Process 13833 stopped
* thread #1: tid = 0x3a6ffe, 0x00000001000c3603
libswiftCore.dylib`ManagedBufferPointer.init(_uncheckedBufferClass :
AnyObject.Type, minimumCapacity : Int) -> ManagedBufferPointer<A, B>
[inlined] Swift._roundUpImpl (Swift.UInt, toAlignment : Swift.Int) ->
Swift.UInt at Builtin.swift:58, queue = 'com.apple.main-thread', stop
reason = step in
frame #0: 0x00000001000c3603
libswiftCore.dylib`ManagedBufferPointer.init(_uncheckedBufferClass :
AnyObject.Type, minimumCapacity : Int) -> ManagedBufferPointer<A, B>
[inlined] Swift._roundUpImpl (Swift.UInt, toAlignment : Swift.Int) ->
Swift.UInt at Builtin.swift:58 [opt]
55 _sanityCheck(_isPowerOf2(alignment))
56 // Note, given that offset is >= 0, and alignment > 0, we don't
57 // need to underflow check the -1, as it can never underflow.
-> 58 let x = offset + UInt(bitPattern: alignment) &- 1
59 // Note, as alignment is a power of 2, we'll use masking to
efficiently
60 // get the aligned value
61 return x & ~(UInt(bitPattern: alignment) &- 1)
(lldb) fr v
(lldb) fr v -R
(lldb) fr v aligment
error: no variable named 'aligment' found in this frame
(lldb) fr v alignment
error: no variable named 'alignment' found in this frame
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