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162814a7ec00e2c89693f96568b72956d1bf2f0f
clang-p2996/lld/test/MachO/arm64-thunks.s
alx32 162814a7ec [lld-macho] Include branch extension thunks in linker map (#120496) 
This patch extends the MachO linker's map file generation to include
branch extension thunk symbols. Previously, thunks were omitted from the
map file, making it difficult to understand the final layout of the
binary, especially when debugging issues related to long branch thunks.
This change ensures thunks are included and correctly interleaved with
other symbols based on their address, providing an accurate
representation of the linked output.
2025-01-07 21:07:51 -08:00

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# REQUIRES: aarch64
## Check for the following:
## (1) address match between thunk definitions and call destinations
## (2) address match between thunk page+offset computations and function
## definitions
## (3) a second thunk is created when the first one goes out of range
## (4) early calls to a dylib stub use a thunk, and later calls the stub
## directly
## (5) Thunks are created for all sections in the text segment with branches.
## (6) Thunks are in the linker map file.
## Notes:
## 0x4000000 = 64 Mi = half the magnitude of the forward-branch range
# RUN: rm -rf %t; mkdir %t
# RUN: llvm-mc -filetype=obj -triple=arm64-apple-darwin %s -o %t/input.o
# RUN: %lld -arch arm64 -dead_strip -lSystem -U _extern_sym -map %t/thunk.map -o %t/thunk %t/input.o
# RUN: llvm-objdump --no-print-imm-hex -d --no-show-raw-insn %t/thunk | FileCheck %s
## Check that the thunks appear in the map file and that everything is sorted by address
# Because of the `.space` instructions, there will end up being a lot of dead symbols in the
# linker map (linker map will be ~2.7GB). So to avoid the test trying to (slowly) match regex
# across all the ~2.7GB of the linker map - generate a version of the linker map without dead symbols.
# RUN: awk '/# Dead Stripped Symbols:/ {exit} {print}' %t/thunk.map > %t/thunk_no_dead_syms.map
# RUN: FileCheck %s --input-file %t/thunk_no_dead_syms.map --check-prefix=MAP
# MAP: 0x{{[[:xdigit:]]+}} {{.*}} _b
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _c
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _d.thunk.0
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _e.thunk.0
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _f.thunk.0
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _g.thunk.0
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _h.thunk.0
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} ___nan.thunk.0
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _d
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _e
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _f
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _g
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _a.thunk.0
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _b.thunk.0
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _h
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _main
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _c.thunk.0
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _d.thunk.1
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _e.thunk.1
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _f.thunk.1
# MAP-NEXT: 0x{{[[:xdigit:]]+}} {{.*}} _z
# CHECK: Disassembly of section __TEXT,__text:
# CHECK: [[#%.13x, A_PAGE:]][[#%.3x, A_OFFSET:]] <_a>:
# CHECK: bl 0x[[#%x, A:]] <_a>
# CHECK: bl 0x[[#%x, B:]] <_b>
# CHECK: bl 0x[[#%x, C:]] <_c>
# CHECK: bl 0x[[#%x, D_THUNK_0:]] <_d.thunk.0>
# CHECK: bl 0x[[#%x, E_THUNK_0:]] <_e.thunk.0>
# CHECK: bl 0x[[#%x, F_THUNK_0:]] <_f.thunk.0>
# CHECK: bl 0x[[#%x, G_THUNK_0:]] <_g.thunk.0>
# CHECK: bl 0x[[#%x, H_THUNK_0:]] <_h.thunk.0>
# CHECK: bl 0x[[#%x, NAN_THUNK_0:]] <___nan.thunk.0>
# CHECK: [[#%.13x, B_PAGE:]][[#%.3x, B_OFFSET:]] <_b>:
# CHECK: bl 0x[[#%x, A]] <_a>
# CHECK: bl 0x[[#%x, B]] <_b>
# CHECK: bl 0x[[#%x, C]] <_c>
# CHECK: bl 0x[[#%x, D_THUNK_0]] <_d.thunk.0>
# CHECK: bl 0x[[#%x, E_THUNK_0]] <_e.thunk.0>
# CHECK: bl 0x[[#%x, F_THUNK_0]] <_f.thunk.0>
# CHECK: bl 0x[[#%x, G_THUNK_0]] <_g.thunk.0>
# CHECK: bl 0x[[#%x, H_THUNK_0]] <_h.thunk.0>
# CHECK: bl 0x[[#%x, NAN_THUNK_0]] <___nan.thunk.0>
# CHECK: [[#%.13x, C_PAGE:]][[#%.3x, C_OFFSET:]] <_c>:
# CHECK: bl 0x[[#%x, A]] <_a>
# CHECK: bl 0x[[#%x, B]] <_b>
# CHECK: bl 0x[[#%x, C]] <_c>
# CHECK: bl 0x[[#%x, D:]] <_d>
# CHECK: bl 0x[[#%x, E:]] <_e>
# CHECK: bl 0x[[#%x, F_THUNK_0]] <_f.thunk.0>
# CHECK: bl 0x[[#%x, G_THUNK_0]] <_g.thunk.0>
# CHECK: bl 0x[[#%x, H_THUNK_0]] <_h.thunk.0>
# CHECK: bl 0x[[#%x, NAN_THUNK_0]] <___nan.thunk.0>
# CHECK: [[#%x, D_THUNK_0]] <_d.thunk.0>:
# CHECK: adrp x16, 0x[[#%x, D_PAGE:]]
# CHECK: add x16, x16, #[[#D_OFFSET:]]
# CHECK: [[#%x, E_THUNK_0]] <_e.thunk.0>:
# CHECK: adrp x16, 0x[[#%x, E_PAGE:]]
# CHECK: add x16, x16, #[[#E_OFFSET:]]
# CHECK: [[#%x, F_THUNK_0]] <_f.thunk.0>:
# CHECK: adrp x16, 0x[[#%x, F_PAGE:]]
# CHECK: add x16, x16, #[[#F_OFFSET:]]
# CHECK: [[#%x, G_THUNK_0]] <_g.thunk.0>:
# CHECK: adrp x16, 0x[[#%x, G_PAGE:]]
# CHECK: add x16, x16, #[[#G_OFFSET:]]
# CHECK: [[#%x, H_THUNK_0]] <_h.thunk.0>:
# CHECK: adrp x16, 0x[[#%x, H_PAGE:]]
# CHECK: add x16, x16, #[[#H_OFFSET:]]
# CHECK: [[#%x, NAN_THUNK_0]] <___nan.thunk.0>:
# CHECK: adrp x16, 0x[[#%x, NAN_PAGE:]]
# CHECK: add x16, x16, #[[#NAN_OFFSET:]]
# CHECK: [[#%x, D_PAGE + D_OFFSET]] <_d>:
# CHECK: bl 0x[[#%x, A]] <_a>
# CHECK: bl 0x[[#%x, B]] <_b>
# CHECK: bl 0x[[#%x, C]] <_c>
# CHECK: bl 0x[[#%x, D]] <_d>
# CHECK: bl 0x[[#%x, E]] <_e>
# CHECK: bl 0x[[#%x, F_THUNK_0]] <_f.thunk.0>
# CHECK: bl 0x[[#%x, G_THUNK_0]] <_g.thunk.0>
# CHECK: bl 0x[[#%x, H_THUNK_0]] <_h.thunk.0>
# CHECK: bl 0x[[#%x, NAN_THUNK_0]] <___nan.thunk.0>
# CHECK: [[#%x, E_PAGE + E_OFFSET]] <_e>:
# CHECK: bl 0x[[#%x, A_THUNK_0:]] <_a.thunk.0>
# CHECK: bl 0x[[#%x, B_THUNK_0:]] <_b.thunk.0>
# CHECK: bl 0x[[#%x, C]] <_c>
# CHECK: bl 0x[[#%x, D]] <_d>
# CHECK: bl 0x[[#%x, E]] <_e>
# CHECK: bl 0x[[#%x, F:]] <_f>
# CHECK: bl 0x[[#%x, G:]] <_g>
# CHECK: bl 0x[[#%x, H_THUNK_0]] <_h.thunk.0>
# CHECK: bl 0x[[#%x, NAN_THUNK_0]] <___nan.thunk.0>
# CHECK: [[#%x, F_PAGE + F_OFFSET]] <_f>:
# CHECK: bl 0x[[#%x, A_THUNK_0]] <_a.thunk.0>
# CHECK: bl 0x[[#%x, B_THUNK_0]] <_b.thunk.0>
# CHECK: bl 0x[[#%x, C]] <_c>
# CHECK: bl 0x[[#%x, D]] <_d>
# CHECK: bl 0x[[#%x, E]] <_e>
# CHECK: bl 0x[[#%x, F]] <_f>
# CHECK: bl 0x[[#%x, G]] <_g>
# CHECK: bl 0x[[#%x, H_THUNK_0]] <_h.thunk.0>
# CHECK: bl 0x[[#%x, NAN_THUNK_0]] <___nan.thunk.0>
# CHECK: [[#%x, G_PAGE + G_OFFSET]] <_g>:
# CHECK: bl 0x[[#%x, A_THUNK_0]] <_a.thunk.0>
# CHECK: bl 0x[[#%x, B_THUNK_0]] <_b.thunk.0>
# CHECK: bl 0x[[#%x, C_THUNK_0:]] <_c.thunk.0>
# CHECK: bl 0x[[#%x, D_THUNK_1:]] <_d.thunk.1>
# CHECK: bl 0x[[#%x, E]] <_e>
# CHECK: bl 0x[[#%x, F]] <_f>
# CHECK: bl 0x[[#%x, G]] <_g>
# CHECK: bl 0x[[#%x, H:]] <_h>
# CHECK: bl 0x[[#%x, STUBS:]]
# CHECK: [[#%x, A_THUNK_0]] <_a.thunk.0>:
# CHECK: adrp x16, 0x[[#%x, A_PAGE]]000
# CHECK: add x16, x16, #[[#%d, A_OFFSET]]
# CHECK: [[#%x, B_THUNK_0]] <_b.thunk.0>:
# CHECK: adrp x16, 0x[[#%x, B_PAGE]]000
# CHECK: add x16, x16, #[[#%d, B_OFFSET]]
# CHECK: [[#%x, H_PAGE + H_OFFSET]] <_h>:
# CHECK: bl 0x[[#%x, A_THUNK_0]] <_a.thunk.0>
# CHECK: bl 0x[[#%x, B_THUNK_0]] <_b.thunk.0>
# CHECK: bl 0x[[#%x, C_THUNK_0]] <_c.thunk.0>
# CHECK: bl 0x[[#%x, D_THUNK_1]] <_d.thunk.1>
# CHECK: bl 0x[[#%x, E]] <_e>
# CHECK: bl 0x[[#%x, F]] <_f>
# CHECK: bl 0x[[#%x, G]] <_g>
# CHECK: bl 0x[[#%x, H]] <_h>
# CHECK: bl 0x[[#%x, STUBS]]
# CHECK: <_main>:
# CHECK: bl 0x[[#%x, A_THUNK_0]] <_a.thunk.0>
# CHECK: bl 0x[[#%x, B_THUNK_0]] <_b.thunk.0>
# CHECK: bl 0x[[#%x, C_THUNK_0]] <_c.thunk.0>
# CHECK: bl 0x[[#%x, D_THUNK_1]] <_d.thunk.1>
# CHECK: bl 0x[[#%x, E_THUNK_1:]] <_e.thunk.1>
# CHECK: bl 0x[[#%x, F_THUNK_1:]] <_f.thunk.1>
# CHECK: bl 0x[[#%x, G]] <_g>
# CHECK: bl 0x[[#%x, H]] <_h>
# CHECK: bl 0x[[#%x, STUBS]]
# CHECK: [[#%x, C_THUNK_0]] <_c.thunk.0>:
# CHECK: adrp x16, 0x[[#%x, C_PAGE]]000
# CHECK: add x16, x16, #[[#%d, C_OFFSET]]
# CHECK: [[#%x, D_THUNK_1]] <_d.thunk.1>:
# CHECK: adrp x16, 0x[[#%x, D_PAGE]]
# CHECK: add x16, x16, #[[#D_OFFSET]]
# CHECK: [[#%x, E_THUNK_1]] <_e.thunk.1>:
# CHECK: adrp x16, 0x[[#%x, E_PAGE]]
# CHECK: add x16, x16, #[[#E_OFFSET]]
# CHECK: [[#%x, F_THUNK_1]] <_f.thunk.1>:
# CHECK: adrp x16, 0x[[#%x, F_PAGE]]
# CHECK: add x16, x16, #[[#F_OFFSET]]
# CHECK: Disassembly of section __TEXT,__lcxx_override:
# CHECK: <_z>:
# CHECK: bl 0x[[#%x, A_THUNK_0]] <_a.thunk.0>
# CHECK: Disassembly of section __TEXT,__stubs:
# CHECK: [[#%x, NAN_PAGE + NAN_OFFSET]] <__stubs>:
.subsections_via_symbols
.text
.globl _a
.p2align 2
_a:
bl _a
bl _b
bl _c
bl _d
bl _e
bl _f
bl _g
bl _h
bl ___nan
ret
.globl _b
.p2align 2
_b:
bl _a
bl _b
bl _c
bl _d
bl _e
bl _f
bl _g
bl _h
bl ___nan
.space 0x4000000-0x3c
ret
.globl _c
.p2align 2
_c:
bl _a
bl _b
bl _c
bl _d
bl _e
bl _f
bl _g
bl _h
bl ___nan
ret
.globl _d
.p2align 2
_d:
bl _a
bl _b
bl _c
bl _d
bl _e
bl _f
bl _g
bl _h
bl ___nan
.space 0x4000000-0x38
ret
.globl _e
.p2align 2
_e:
bl _a
bl _b
bl _c
bl _d
bl _e
bl _f
bl _g
bl _h
bl ___nan
ret
.globl _f
.p2align 2
_f:
bl _a
bl _b
bl _c
bl _d
bl _e
bl _f
bl _g
bl _h
bl ___nan
.space 0x4000000-0x34
ret
.globl _g
.p2align 2
_g:
bl _a
bl _b
bl _c
bl _d
bl _e
bl _f
bl _g
bl _h
bl ___nan
ret
.globl _h
.p2align 2
_h:
bl _a
bl _b
bl _c
bl _d
bl _e
bl _f
bl _g
bl _h
bl ___nan
.space 0x4000000-0x30
ret
.globl _main
.p2align 2
_main:
bl _a
bl _b
bl _c
bl _d
bl _e
bl _f
bl _g
bl _h
bl ___nan
ret
.section __TEXT,__cstring
.space 0x4000000
.section __TEXT,__lcxx_override,regular,pure_instructions
.globl _z
.no_dead_strip _z
.p2align 2
_z:
bl _a
## Ensure calling into stubs works
bl _extern_sym
ret
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