119d507afc
MS link.exe provides the `/sectionlayout:@` option to specify the order
of output sections at the granularity of individual sections. LLD/COFF
currently does not have capability for user-controlled ordering of one
or more output sections (as LLD/COFF does not support linker scripts),
and this PR adds the option to align with MS link.exe.
The option accepts only a file that specifies the order of sections, one
per line. For example, `mylayout.txt` could emit the `.text` section
after all other sections while preserving the original relative order of
the remaining sections.
```
.data
.rdata
.pdata
.rsrc
.reloc
.text
```
```bash
echo 'int main() { return 0; }' > main.c
cl main.c /link /entry:main /sectionlayout:@mylayout.txt
llvm-readobj --sections main.exe
```
130 lines
4.1 KiB
Plaintext
130 lines
4.1 KiB
Plaintext
RUN: yaml2obj %p/Inputs/sectionlayout.yaml -o %t.obj
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## Error on non-exist input layout file
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RUN: not lld-link /entry:main /sectionlayout:doesnotexist.txt %t.obj
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## Order in 1 -> 3 -> 2
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RUN: echo ".text1" > %t.layout.txt
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RUN: echo ".text3" >> %t.layout.txt
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RUN: echo ".text2" >> %t.layout.txt
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RUN: lld-link /out:%t.exe /entry:main /sectionlayout:%t.layout.txt %t.obj
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RUN: llvm-readobj --sections %t.exe | FileCheck -check-prefix=CHECK1 %s
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## While /sectionlayout:abc is valid, /sectionlayout:@abc is also accepted (to align with MS link.exe)
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RUN: lld-link /out:%t.exe /entry:main /sectionlayout:@%t.layout.txt %t.obj
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RUN: llvm-readobj --sections %t.exe | FileCheck -check-prefix=CHECK1 %s
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## Ensure tokens after section name is ignored (for now, to align with MS link.exe)
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RUN: echo ".text1 ALIGN=1" > %t.layout.txt
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RUN: echo ".text3" >> %t.layout.txt
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RUN: echo ".text2" >> %t.layout.txt
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RUN: lld-link /out:%t.exe /entry:main /sectionlayout:@%t.layout.txt %t.obj
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RUN: llvm-readobj --sections %t.exe | FileCheck -check-prefix=CHECK1 %s
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CHECK1: Sections [
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CHECK1: Section {
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CHECK1: Number: 1
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CHECK1: Name: .text1
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CHECK1: }
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CHECK1: Section {
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CHECK1: Number: 2
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CHECK1: Name: .text3
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CHECK1: }
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CHECK1: Section {
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CHECK1: Number: 3
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CHECK1: Name: .text2
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CHECK1: }
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CHECK1: ]
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## Order in 3 -> 2 -> 1
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RUN: echo ".text3" > %t.layout.txt
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RUN: echo ".text2" >> %t.layout.txt
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RUN: echo ".text1" >> %t.layout.txt
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RUN: lld-link /out:%t.exe /entry:main /sectionlayout:%t.layout.txt %t.obj
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RUN: llvm-readobj --sections %t.exe | FileCheck -check-prefix=CHECK2 %s
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CHECK2: Sections [
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CHECK2: Section {
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CHECK2: Number: 1
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CHECK2: Name: .text3
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CHECK2: }
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CHECK2: Section {
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CHECK2: Number: 2
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CHECK2: Name: .text2
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CHECK2: }
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CHECK2: Section {
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CHECK2: Number: 3
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CHECK2: Name: .text1
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CHECK2: }
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CHECK2: ]
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## Put non-exisist section in layout file has no effect; original order is respected
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RUN: echo "notexist" > %t.layout.txt
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RUN: lld-link /out:%t.exe /entry:main /sectionlayout:%t.layout.txt %t.obj
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RUN: llvm-readobj --sections %t.exe | FileCheck -check-prefix=CHECK3 %s
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## Empty layout file has no effect
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RUN: echo "" > %t.layout.txt
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RUN: lld-link /out:%t.exe /entry:main /sectionlayout:%t.layout.txt %t.obj
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RUN: llvm-readobj --sections %t.exe | FileCheck -check-prefix=CHECK3 %s
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## Empty layout file has no effect
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RUN: echo " " > %t.layout.txt
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RUN: echo " " >> %t.layout.txt
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RUN: lld-link /out:%t.exe /entry:main /sectionlayout:%t.layout.txt %t.obj
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RUN: llvm-readobj --sections %t.exe | FileCheck -check-prefix=CHECK3 %s
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CHECK3: Sections [
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CHECK3: Section {
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CHECK3: Number: 1
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CHECK3: Name: .text1
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CHECK3: }
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CHECK3: Section {
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CHECK3: Number: 2
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CHECK3: Name: .text2
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CHECK3: }
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CHECK3: Section {
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CHECK3: Number: 3
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CHECK3: Name: .text3
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CHECK3: }
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CHECK3: ]
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## Order in 3 -> 1, but 2 remains unspecified
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RUN: echo ".text3" > %t.layout.txt
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RUN: echo ".text1" >> %t.layout.txt
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RUN: lld-link /out:%t.exe /entry:main /sectionlayout:%t.layout.txt %t.obj
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RUN: llvm-readobj --sections %t.exe | FileCheck -check-prefix=CHECK4 %s
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CHECK4: Sections [
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CHECK4: Section {
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CHECK4: Number: 1
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CHECK4: Name: .text3
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CHECK4: }
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CHECK4: Section {
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CHECK4: Number: 2
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CHECK4: Name: .text1
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CHECK4: }
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CHECK4: Section {
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CHECK4: Number: 3
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CHECK4: Name: .text2
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CHECK4: }
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CHECK4: ]
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## Order in 3 -> 2, but 1 remains unspecified.
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## 1 should be the first, as the original order (1 -> 2 -> 3) is respected
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RUN: echo ".text3" > %t.layout.txt
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RUN: echo ".text2" >> %t.layout.txt
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RUN: lld-link /out:%t.exe /entry:main /sectionlayout:%t.layout.txt %t.obj
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RUN: llvm-readobj --sections %t.exe | FileCheck -check-prefix=CHECK2 %s
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## Order in 3 -> 2 -> 1, multiple specification has no effect (the first one is used)
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RUN: echo ".text3" > %t.layout.txt
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RUN: echo ".text3" >> %t.layout.txt
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RUN: echo ".text3" >> %t.layout.txt
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RUN: echo ".text2" >> %t.layout.txt
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RUN: echo ".text2" >> %t.layout.txt
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RUN: echo ".text1" >> %t.layout.txt
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RUN: echo ".text3" >> %t.layout.txt
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RUN: lld-link /out:%t.exe /entry:main /sectionlayout:%t.layout.txt %t.obj
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RUN: llvm-readobj --sections %t.exe | FileCheck -check-prefix=CHECK2 %s
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