7b346357db
`findOrphanPos` finds the most similar output section (that has input sections). In the event of proximity ties, we select the first section. However, when an orphan section's rank is equal to or larger than the most similar sections's, it makes sense to prioritize the last similar section. This new behavior matches GNU ld better. ``` // orphan placement for .bss (SHF_ALLOC|SHF_WRITE, SHT_NOBITS) WA SHT_PROGBITS (old behavior) <= here A WA SHT_PROGBITS AX WA (.data) (new behavior) <= here ``` When the orphan section's rank is less, the current behavior prioritizing the first section still makes sense. ``` // orphan with a smaller rank, e.g. .rodata <= here WA AX WA ``` Close #92987 Pull Request: https://github.com/llvm/llvm-project/pull/94099
107 lines
4.7 KiB
ArmAsm
107 lines
4.7 KiB
ArmAsm
# REQUIRES: x86
|
|
# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
|
|
|
|
# Empty SECTIONS command.
|
|
# RUN: echo "SECTIONS {}" > %t.script
|
|
# RUN: ld.lld -o %t1 --script %t.script %t
|
|
# RUN: llvm-objdump --section-headers %t1 | \
|
|
# RUN: FileCheck -check-prefix=SEC-DEFAULT %s
|
|
|
|
# SECTIONS command with the same order as default.
|
|
# RUN: echo "SECTIONS { \
|
|
# RUN: .text : { *(.text) } \
|
|
# RUN: .data : { *(.data) } }" > %t.script
|
|
# RUN: ld.lld -o %t2 --script %t.script %t
|
|
# RUN: llvm-objdump --section-headers %t2 | \
|
|
# RUN: FileCheck -check-prefix=SEC-DEFAULT %s
|
|
|
|
# Idx Name Size
|
|
# SEC-DEFAULT: 1 .text 0000000e {{[0-9a-f]*}} TEXT
|
|
# SEC-DEFAULT: 2 .data 00000020 {{[0-9a-f]*}} DATA
|
|
# SEC-DEFAULT: 3 other 00000003 {{[0-9a-f]*}} DATA
|
|
# SEC-DEFAULT: 4 .bss 00000002 {{[0-9a-f]*}} BSS
|
|
# SEC-DEFAULT: 5 .comment 00000008 {{[0-9a-f]*}}
|
|
# SEC-DEFAULT: 6 .symtab 00000030 {{[0-9a-f]*}}
|
|
# SEC-DEFAULT: 7 .shstrtab 0000003b {{[0-9a-f]*}}
|
|
# SEC-DEFAULT: 8 .strtab 00000008 {{[0-9a-f]*}}
|
|
|
|
# .text and .data have swapped names but proper sizes and types.
|
|
# RUN: echo "SECTIONS { \
|
|
# RUN: .data : { *(.text) } \
|
|
# RUN: .text : { *(.data) } }" > %t.script
|
|
# RUN: ld.lld -o %t4 --script %t.script %t
|
|
# RUN: llvm-objdump --section-headers %t4 | \
|
|
# RUN: FileCheck -check-prefix=SEC-SWAP-NAMES %s
|
|
|
|
# Idx Name Size
|
|
# SEC-SWAP-NAMES: 1 .data 0000000e {{[0-9a-f]*}} TEXT
|
|
# SEC-SWAP-NAMES: 2 .text 00000020 {{[0-9a-f]*}} DATA
|
|
# SEC-SWAP-NAMES: 3 other 00000003 {{[0-9a-f]*}} DATA
|
|
# SEC-SWAP-NAMES: 4 .bss 00000002 {{[0-9a-f]*}} BSS
|
|
# SEC-SWAP-NAMES: 5 .comment 00000008 {{[0-9a-f]*}}
|
|
# SEC-SWAP-NAMES: 6 .symtab 00000030 {{[0-9a-f]*}}
|
|
# SEC-SWAP-NAMES: 7 .shstrtab 0000003b {{[0-9a-f]*}}
|
|
# SEC-SWAP-NAMES: 8 .strtab 00000008 {{[0-9a-f]*}}
|
|
|
|
# Multiple SECTIONS command specifying additional input section descriptions
|
|
# for the same output section description - input sections are merged into
|
|
# one output section.
|
|
# RUN: echo "SECTIONS { \
|
|
# RUN: .text : { *(.text) } \
|
|
# RUN: .data : { *(.data) } } \
|
|
# RUN: SECTIONS { \
|
|
# RUN: .data : { *(other) } }" > %t.script
|
|
# RUN: ld.lld -o %t6 --script %t.script %t
|
|
# RUN: llvm-objdump --section-headers %t6 | \
|
|
# RUN: FileCheck -check-prefix=SEC-MULTI %s
|
|
|
|
# Idx Name Size
|
|
# SEC-MULTI: 1 .text 0000000e {{[0-9a-f]*}} TEXT
|
|
# SEC-MULTI-NEXT: .data 00000020 {{[0-9a-f]*}} DATA
|
|
# SEC-MULTI-NEXT: .data 00000003 {{[0-9a-f]*}} DATA
|
|
# SEC-MULTI-NEXT: .bss 00000002 {{[0-9a-f]*}} BSS
|
|
# SEC-MULTI-NEXT: .comment 00000008 {{[0-9a-f]*}}
|
|
# SEC-MULTI-NEXT: .symtab 00000030 {{[0-9a-f]*}}
|
|
# SEC-MULTI-NEXT: .shstrtab 00000035 {{[0-9a-f]*}}
|
|
# SEC-MULTI-NEXT: .strtab 00000008 {{[0-9a-f]*}}
|
|
|
|
## other is placed in a PT_LOAD segment even if it is preceded by a non-alloc section.
|
|
## The current implementation places .data, .bss, .comment and other in the same PT_LOAD.
|
|
# RUN: echo 'SECTIONS { \
|
|
# RUN: .text : { *(.text) } \
|
|
# RUN: .data : { *(.data) } \
|
|
# RUN: .comment : { *(.comment) } \
|
|
# RUN: other : { *(other) } }' > %t5.lds
|
|
# RUN: ld.lld -o %t5 -T %t5.lds %t
|
|
# RUN: llvm-readelf -S -l %t5 | FileCheck --check-prefix=SEP-BY-NONALLOC %s
|
|
|
|
# SEP-BY-NONALLOC: [Nr] Name Type Address Off Size ES Flg
|
|
# SEP-BY-NONALLOC: [ 1] .text PROGBITS 0000000000000000 001000 00000e 00 AX
|
|
# SEP-BY-NONALLOC-NEXT: [ 2] .data PROGBITS 000000000000000e 00100e 000020 00 WA
|
|
# SEP-BY-NONALLOC-NEXT: [ 3] .comment PROGBITS 0000000000000000 001031 000008 01 MS
|
|
# SEP-BY-NONALLOC: [ 7] other PROGBITS 000000000000002e 00102e 000003 00 WA
|
|
# SEP-BY-NONALLOC-NEXT: [ 8] .bss NOBITS 0000000000000031 001031 000002 00 WA
|
|
|
|
# SEP-BY-NONALLOC: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
|
|
# SEP-BY-NONALLOC-NEXT: LOAD 0x001000 0x0000000000000000 0x0000000000000000 0x00000e 0x00000e R E 0x1000
|
|
# SEP-BY-NONALLOC-NEXT: LOAD 0x00100e 0x000000000000000e 0x000000000000000e 0x000023 0x000025 RW 0x1000
|
|
# SEP-BY-NONALLOC-NEXT: GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000 0x000000 RW 0
|
|
|
|
# Input section pattern contains additional semicolon.
|
|
# Case found in linux kernel script. Check we are able to parse it.
|
|
# RUN: echo "SECTIONS { .text : { ;;*(.text);;S = 0;; } }" > %t.script
|
|
# RUN: ld.lld -o /dev/null --script %t.script %t
|
|
|
|
.globl _start
|
|
_start:
|
|
mov $60, %rax
|
|
mov $42, %rdi
|
|
|
|
.section .data,"aw"
|
|
.quad 10, 10, 20, 20
|
|
.section other,"aw"
|
|
.short 10
|
|
.byte 20
|
|
.section .bss,"",@nobits
|
|
.short 0
|