libdispatch compiled without frame pointers in at least in Swift 6.2, 6.1 and 6.0 on x86_64 #909
Description
It appears that Swift on Linux is still compiling without frame pointers in 6.0, 6.1 and 6.2. The official docker images for for example Ubuntu 24.04 (noble) on x86_64 have this code:
Expected:
has pushq %rbp; movq %rsp, %rbp
Actual:
hasn't got push rbp; mov rsp,rbp
One-line repro from nothing: docker run -it --rm --platform linux/amd64 swift:6.2-noble lldb --batch -o 'dis -n _dispatch_sema4_wait' /usr/lib/swift/linux/libdispatch.so
(lldb) target create "/usr/lib/swift/linux/libdispatch.so"
Current executable set to '/usr/lib/swift/linux/libdispatch.so' (x86_64).
(lldb) dis -n _dispatch_sema4_wait
libdispatch.so`_dispatch_sema4_wait:
libdispatch.so[0x3c580] <+0>: pushq %rbx
libdispatch.so[0x3c581] <+1>: movq %rdi, %rbx
libdispatch.so[0x3c584] <+4>: nopw %cs:(%rax,%rax)
libdispatch.so[0x3c590] <+16>: movq %rbx, %rdi
libdispatch.so[0x3c593] <+19>: callq 0x1f410 ; symbol stub for: sem_wait
libdispatch.so[0x3c598] <+24>: cmpl $-0x1, %eax
libdispatch.so[0x3c59b] <+27>: jne 0x3c5ac ; <+44>
libdispatch.so[0x3c59d] <+29>: callq 0x1ee20 ; symbol stub for: __errno_location
libdispatch.so[0x3c5a2] <+34>: cmpl $0x4, (%rax)
libdispatch.so[0x3c5a5] <+37>: je 0x3c590 ; <+16>
libdispatch.so[0x3c5a7] <+39>: callq 0x22c70 ; _dispatch_sema4_wait.cold.1
libdispatch.so[0x3c5ac] <+44>: popq %rbx
libdispatch.so[0x3c5ad] <+45>: retq
Same for the Swift overlay :(
No rbp pushing
(lldb) dis -n 'Dispatch.DispatchSemaphore.wait'
libswiftDispatch.so`wait:
libswiftDispatch.so[0x19120] <+0>: jmp 0x190b0 ; Dispatch.DispatchSemaphore.wait(wallTimeout: Dispatch.DispatchWallTime) -> Dispatch.DispatchTimeoutResult
libswiftDispatch.so`wait:
libswiftDispatch.so[0x190b0] <+0>: pushq %rax
libswiftDispatch.so[0x190b1] <+1>: movq %rdi, %rsi
libswiftDispatch.so[0x190b4] <+4>: movq 0x10(%r13), %rdi
libswiftDispatch.so[0x190b8] <+8>: callq 0x14ca0 ; symbol stub for: dispatch_semaphore_wait
libswiftDispatch.so[0x190bd] <+13>: testq %rax, %rax
libswiftDispatch.so[0x190c0] <+16>: setne %al
libswiftDispatch.so[0x190c3] <+19>: popq %rcx
libswiftDispatch.so[0x190c4] <+20>: retq
libswiftDispatch.so`wait:
libswiftDispatch.so[0x190a0] <+0>: movq 0x10(%r13), %rdi
libswiftDispatch.so[0x190a4] <+4>: movq $-0x1, %rsi
libswiftDispatch.so[0x190ab] <+11>: jmp 0x14ca0 ; symbol stub for: dispatch_semaphore_wait
running the one-line repro:
$ docker run -it --rm --platform linux/amd64 swift:6.2-noble lldb --batch -o 'dis -n _dispatch_sema4_wait' /usr/lib/swift/linux/libdispatch.so
lldb[1]: ==== LLDB swift-healthcheck log. ===
This file contains the configuration of LLDB's embedded Swift compiler to help diagnosing module import and search path issues. The swift-healthcheck command is meant to be run *after* an error has occurred.
lldb version 17.0.0 (https://github.com/swiftlang/llvm-project.git revision f403f1080b28ed3bf592ccbc491dadda2a5d4814)
Swift version 6.2 (swift-6.2-RELEASE)
(lldb) target create "/usr/lib/swift/linux/libdispatch.so"
Current executable set to '/usr/lib/swift/linux/libdispatch.so' (x86_64).
(lldb) dis -n _dispatch_sema4_wait
libdispatch.so`_dispatch_sema4_wait:
libdispatch.so[0x3c580] <+0>: pushq %rbx
libdispatch.so[0x3c581] <+1>: movq %rdi, %rbx
libdispatch.so[0x3c584] <+4>: nopw %cs:(%rax,%rax)
libdispatch.so[0x3c590] <+16>: movq %rbx, %rdi
libdispatch.so[0x3c593] <+19>: callq 0x1f410 ; symbol stub for: sem_wait
libdispatch.so[0x3c598] <+24>: cmpl $-0x1, %eax
libdispatch.so[0x3c59b] <+27>: jne 0x3c5ac ; <+44>
libdispatch.so[0x3c59d] <+29>: callq 0x1ee20 ; symbol stub for: __errno_location
libdispatch.so[0x3c5a2] <+34>: cmpl $0x4, (%rax)
libdispatch.so[0x3c5a5] <+37>: je 0x3c590 ; <+16>
libdispatch.so[0x3c5a7] <+39>: callq 0x22c70 ; _dispatch_sema4_wait.cold.1
libdispatch.so[0x3c5ac] <+44>: popq %rbx
libdispatch.so[0x3c5ad] <+45>: retq