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llvm-project/lld/test/MachO/dso-handle.s

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[lld-macho] Support __dso_handle for C++ The C++ ABI requires dylibs to pass a pointer to __cxa_atexit which does e.g. cleanup of static global variables. The C++ spec says that the pointer can point to any address in one of the dylib's segments, but in practice ld64 seems to set it to point to the header, so that's what's implemented here. Reviewed By: #lld-macho, smeenai Differential Revision: https://reviews.llvm.org/D83603
2020-07-31 05:28:41 +08:00
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %s -o %t.o
[lld-macho][nfc] Give every SyntheticSection a fake InputSection Previously, it was difficult to write code that handled both synthetic and regular sections generically. We solve this problem by creating a fake InputSection at the start of every SyntheticSection. This refactor allows us to handle DSOHandle like a regular Defined symbol (since Defined symbols must be attached to an InputSection), and paves the way for supporting `__mh_*header` symbols. Additionally, it simplifies our binding/rebase code. I did have to extend Defined a little -- it now has a `linkerInternal` flag, to indicate that `___dso_handle` should not be in the final symbol table. I've also added some additional testing for `___dso_handle`. Reviewed By: #lld-macho, oontvoo Differential Revision: https://reviews.llvm.org/D98545
2021-03-13 06:26:12 +08:00
# RUN: %lld -lSystem %t.o -o %t
[lld-macho] Support __dso_handle for C++ The C++ ABI requires dylibs to pass a pointer to __cxa_atexit which does e.g. cleanup of static global variables. The C++ spec says that the pointer can point to any address in one of the dylib's segments, but in practice ld64 seems to set it to point to the header, so that's what's implemented here. Reviewed By: #lld-macho, smeenai Differential Revision: https://reviews.llvm.org/D83603
2020-07-31 05:28:41 +08:00
# RUN: llvm-objdump -d --no-show-raw-insn %t | FileCheck %s
[llvm-objdump] Print memory operand addresses as regular comments The patch reuses the common code to print memory operand addresses as instruction comments. This helps to align the comments and enables using target-specific comment markers when `evaluateMemoryOperandAddress()` is implemented for them. Differential Revision: https://reviews.llvm.org/D104861
2021-06-28 15:24:39 +08:00
# CHECK: leaq {{.*}} ## 0x100000000
# CHECK-NEXT: leaq {{.*}} ## 0x100000000
[lld-macho] Support __dso_handle for C++ The C++ ABI requires dylibs to pass a pointer to __cxa_atexit which does e.g. cleanup of static global variables. The C++ spec says that the pointer can point to any address in one of the dylib's segments, but in practice ld64 seems to set it to point to the header, so that's what's implemented here. Reviewed By: #lld-macho, smeenai Differential Revision: https://reviews.llvm.org/D83603
2020-07-31 05:28:41 +08:00
[lld-macho] Always include custom syslibroot when running tests This greatly reduces the amount of boilerplate in our tests. Reviewed By: #lld-macho, compnerd Differential Revision: https://reviews.llvm.org/D87960
2020-09-19 12:40:12 +08:00
# RUN: %lld -dylib %t.o -o %t.dylib
[lld-macho][nfc] Give every SyntheticSection a fake InputSection Previously, it was difficult to write code that handled both synthetic and regular sections generically. We solve this problem by creating a fake InputSection at the start of every SyntheticSection. This refactor allows us to handle DSOHandle like a regular Defined symbol (since Defined symbols must be attached to an InputSection), and paves the way for supporting `__mh_*header` symbols. Additionally, it simplifies our binding/rebase code. I did have to extend Defined a little -- it now has a `linkerInternal` flag, to indicate that `___dso_handle` should not be in the final symbol table. I've also added some additional testing for `___dso_handle`. Reviewed By: #lld-macho, oontvoo Differential Revision: https://reviews.llvm.org/D98545
2021-03-13 06:26:12 +08:00
# RUN: llvm-objdump -d --no-show-raw-insn --rebase --section-headers %t.dylib | FileCheck %s --check-prefix=DYLIB-CHECK
[llvm-objdump] Print memory operand addresses as regular comments The patch reuses the common code to print memory operand addresses as instruction comments. This helps to align the comments and enables using target-specific comment markers when `evaluateMemoryOperandAddress()` is implemented for them. Differential Revision: https://reviews.llvm.org/D104861
2021-06-28 15:24:39 +08:00
# DYLIB-CHECK: leaq {{.*}} ## 0x0
# DYLIB-CHECK-NEXT: leaq {{.*}} ## 0x0
[lld-macho] Support __dso_handle for C++ The C++ ABI requires dylibs to pass a pointer to __cxa_atexit which does e.g. cleanup of static global variables. The C++ spec says that the pointer can point to any address in one of the dylib's segments, but in practice ld64 seems to set it to point to the header, so that's what's implemented here. Reviewed By: #lld-macho, smeenai Differential Revision: https://reviews.llvm.org/D83603
2020-07-31 05:28:41 +08:00
[lld-macho][nfc] Give every SyntheticSection a fake InputSection Previously, it was difficult to write code that handled both synthetic and regular sections generically. We solve this problem by creating a fake InputSection at the start of every SyntheticSection. This refactor allows us to handle DSOHandle like a regular Defined symbol (since Defined symbols must be attached to an InputSection), and paves the way for supporting `__mh_*header` symbols. Additionally, it simplifies our binding/rebase code. I did have to extend Defined a little -- it now has a `linkerInternal` flag, to indicate that `___dso_handle` should not be in the final symbol table. I've also added some additional testing for `___dso_handle`. Reviewed By: #lld-macho, oontvoo Differential Revision: https://reviews.llvm.org/D98545
2021-03-13 06:26:12 +08:00
# DYLIB-LABEL: Sections:
# DYLIB: __data 00000008 [[#%x,DATA:]] DATA
# DYLIB-LABEL: Rebase table:
# DYLIB-NEXT: segment section address type
# DYLIB-NEXT: __DATA __data 0x{{0*}}[[#DATA]] pointer
# RUN: llvm-objdump --syms %t.dylib | FileCheck %s --check-prefix=SYMS
# SYMS-NOT: ___dso_handle
[lld-macho] Support __dso_handle for C++ The C++ ABI requires dylibs to pass a pointer to __cxa_atexit which does e.g. cleanup of static global variables. The C++ spec says that the pointer can point to any address in one of the dylib's segments, but in practice ld64 seems to set it to point to the header, so that's what's implemented here. Reviewed By: #lld-macho, smeenai Differential Revision: https://reviews.llvm.org/D83603
2020-07-31 05:28:41 +08:00
.globl _main
.text
_main:
leaq ___dso_handle(%rip), %rdx
[lld-macho] Support GOT relocations to __dso_handle Found such a relocation while testing some real world programs. Reviewed By: #lld-macho, smeenai Differential Revision: https://reviews.llvm.org/D86642
2020-08-28 06:59:48 +08:00
movq ___dso_handle@GOTPCREL(%rip), %rdx
[lld-macho] Support __dso_handle for C++ The C++ ABI requires dylibs to pass a pointer to __cxa_atexit which does e.g. cleanup of static global variables. The C++ spec says that the pointer can point to any address in one of the dylib's segments, but in practice ld64 seems to set it to point to the header, so that's what's implemented here. Reviewed By: #lld-macho, smeenai Differential Revision: https://reviews.llvm.org/D83603
2020-07-31 05:28:41 +08:00
ret
[lld-macho][nfc] Give every SyntheticSection a fake InputSection Previously, it was difficult to write code that handled both synthetic and regular sections generically. We solve this problem by creating a fake InputSection at the start of every SyntheticSection. This refactor allows us to handle DSOHandle like a regular Defined symbol (since Defined symbols must be attached to an InputSection), and paves the way for supporting `__mh_*header` symbols. Additionally, it simplifies our binding/rebase code. I did have to extend Defined a little -- it now has a `linkerInternal` flag, to indicate that `___dso_handle` should not be in the final symbol table. I've also added some additional testing for `___dso_handle`. Reviewed By: #lld-macho, oontvoo Differential Revision: https://reviews.llvm.org/D98545
2021-03-13 06:26:12 +08:00
.data
.quad ___dso_handle