5210141b07
We used to place orphans by just using compareSectionsNonScript. Then we noticed that since linker scripts can use another order, we should first try match the section to a given PT_LOAD. But there is nothing special about PT_LOAD. The same issue can show up for PT_GNU_RELRO for example. In general, we have to search for the most similar section and put the orphan next to it. Most similar being defined as how long they follow the same code path in compareSecitonsNonScript. That is what this patch does. We now compute a rank for each output section, with a bit for each branch in what was compareSectionsNonScript. With this findOrphanPos is now fully general and orphan placement can be optimized by placing every section with the same rank at once. The included testcase is a variation of many-sections.s that uses allocatable sections to avoid the fast path in the existing code. Without threads it goes form 46 seconds to 0.9 seconds. llvm-svn: 302903
115 lines
4.5 KiB
ArmAsm
115 lines
4.5 KiB
ArmAsm
# REQUIRES: x86
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# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
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# Empty SECTIONS command.
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# RUN: echo "SECTIONS {}" > %t.script
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# RUN: ld.lld -o %t1 --script %t.script %t
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# RUN: llvm-objdump -section-headers %t1 | \
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# RUN: FileCheck -check-prefix=SEC-DEFAULT %s
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# SECTIONS command with the same order as default.
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# RUN: echo "SECTIONS { \
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# RUN: .text : { *(.text) } \
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# RUN: .data : { *(.data) } }" > %t.script
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# RUN: ld.lld -o %t2 --script %t.script %t
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# RUN: llvm-objdump -section-headers %t2 | \
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# RUN: FileCheck -check-prefix=SEC-DEFAULT %s
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# Idx Name Size
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# SEC-DEFAULT: 1 .text 0000000e {{[0-9a-f]*}} TEXT DATA
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# SEC-DEFAULT: 2 .data 00000020 {{[0-9a-f]*}} DATA
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# SEC-DEFAULT: 3 other 00000003 {{[0-9a-f]*}} DATA
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# SEC-DEFAULT: 4 .bss 00000002 {{[0-9a-f]*}} BSS
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# SEC-DEFAULT: 5 .comment 00000008 {{[0-9a-f]*}}
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# SEC-DEFAULT: 6 .symtab 00000030 {{[0-9a-f]*}}
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# SEC-DEFAULT: 7 .shstrtab 0000003b {{[0-9a-f]*}}
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# SEC-DEFAULT: 8 .strtab 00000008 {{[0-9a-f]*}}
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# Sections are put in order specified in linker script, other than alloc
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# sections going first.
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# RUN: echo "SECTIONS { \
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# RUN: .bss : { *(.bss) } \
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# RUN: other : { *(other) } \
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# RUN: .shstrtab : { *(.shstrtab) } \
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# RUN: .symtab : { *(.symtab) } \
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# RUN: .strtab : { *(.strtab) } \
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# RUN: .data : { *(.data) } \
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# RUN: .text : { *(.text) } }" > %t.script
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# RUN: ld.lld -o %t3 --script %t.script %t
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# RUN: llvm-objdump -section-headers %t3 | \
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# RUN: FileCheck -check-prefix=SEC-ORDER %s
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# Idx Name Size
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# SEC-ORDER: 1 .bss 00000002 {{[0-9a-f]*}} BSS
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# SEC-ORDER: 2 other 00000003 {{[0-9a-f]*}} DATA
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# SEC-ORDER: 3 .shstrtab 0000003b {{[0-9a-f]*}}
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# SEC-ORDER: 4 .symtab 00000030 {{[0-9a-f]*}}
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# SEC-ORDER: 5 .strtab 00000008 {{[0-9a-f]*}}
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# SEC-ORDER: 6 .comment 00000008 {{[0-9a-f]*}}
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# SEC-ORDER: 7 .data 00000020 {{[0-9a-f]*}} DATA
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# SEC-ORDER: 8 .text 0000000e {{[0-9a-f]*}} TEXT DATA
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# .text and .data have swapped names but proper sizes and types.
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# RUN: echo "SECTIONS { \
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# RUN: .data : { *(.text) } \
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# RUN: .text : { *(.data) } }" > %t.script
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# RUN: ld.lld -o %t4 --script %t.script %t
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# RUN: llvm-objdump -section-headers %t4 | \
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# RUN: FileCheck -check-prefix=SEC-SWAP-NAMES %s
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# Idx Name Size
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# SEC-SWAP-NAMES: 1 .data 0000000e {{[0-9a-f]*}} TEXT DATA
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# SEC-SWAP-NAMES: 2 .text 00000020 {{[0-9a-f]*}} DATA
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# SEC-SWAP-NAMES: 3 other 00000003 {{[0-9a-f]*}} DATA
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# SEC-SWAP-NAMES: 4 .bss 00000002 {{[0-9a-f]*}} BSS
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# SEC-SWAP-NAMES: 5 .comment 00000008 {{[0-9a-f]*}}
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# SEC-SWAP-NAMES: 6 .symtab 00000030 {{[0-9a-f]*}}
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# SEC-SWAP-NAMES: 7 .shstrtab 0000003b {{[0-9a-f]*}}
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# SEC-SWAP-NAMES: 8 .strtab 00000008 {{[0-9a-f]*}}
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# Attemp to discard .shstrtab section.
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# RUN: echo "SECTIONS { /DISCARD/ : { *(.shstrtab) } }" > %t.script
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# RUN: not ld.lld -o %t5 --script %t.script %t 2>&1 | \
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# RUN: FileCheck -check-prefix=SEC-DISCARD %s
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# SEC-DISCARD: discarding .shstrtab section is not allowed
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# Multiple SECTIONS command specifying additional input section descriptions
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# for the same output section description - input sections are merged into
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# one output section.
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# RUN: echo "SECTIONS { \
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# RUN: .text : { *(.text) } \
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# RUN: .data : { *(.data) } } \
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# RUN: SECTIONS { \
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# RUN: .data : { *(other) } }" > %t.script
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# RUN: ld.lld -o %t6 --script %t.script %t
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# RUN: llvm-objdump -section-headers %t6 | \
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# RUN: FileCheck -check-prefix=SEC-MULTI %s
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# Idx Name Size
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# SEC-MULTI: 1 .text 0000000e {{[0-9a-f]*}} TEXT DATA
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# SEC-MULTI-NEXT: .data 00000020 {{[0-9a-f]*}} DATA
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# SEC-MULTI-NEXT: .data 00000003 {{[0-9a-f]*}} DATA
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# SEC-MULTI-NEXT: .bss 00000002 {{[0-9a-f]*}} BSS
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# SEC-MULTI-NEXT: .comment 00000008 {{[0-9a-f]*}}
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# SEC-MULTI-NEXT: .symtab 00000030 {{[0-9a-f]*}}
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# SEC-MULTI-NEXT: .shstrtab 00000035 {{[0-9a-f]*}}
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# SEC-MULTI-NEXT: .strtab 00000008 {{[0-9a-f]*}}
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# Input section pattern contains additional semicolon.
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# Case found in linux kernel script. Check we are able to parse it.
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# RUN: echo "SECTIONS { .text : { ;;*(.text);;S = 0;; } }" > %t.script
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# RUN: ld.lld -o /dev/null --script %t.script %t
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.globl _start
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_start:
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mov $60, %rax
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mov $42, %rdi
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.section .data,"aw"
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.quad 10, 10, 20, 20
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.section other,"aw"
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.short 10
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.byte 20
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.section .bss,"",@nobits
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.short 0
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