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llvm-project/lld/test/COFF/lto-comdat.ll

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COFF: Symbol resolution for common and comdat symbols defined in bitcode. In the case where either a bitcode file and a regular file or two bitcode files export a common or comdat symbol with the same name, the linker needs to pick one of them following COFF semantics. This patch implements a design for resolving such symbols that pushes most of the work onto either LLD's regular mechanism for resolving common or comdat symbols or the IR linker's mechanism for doing the same. We modify SymbolBody::compare to always prefer non-bitcode symbols, so that during the initial phase of symbol resolution, the symbol table always contains a regular symbol in any case where we need to choose between a regular and a bitcode symbol. In SymbolTable::addCombinedLTOObject, we force export any bitcode symbols that were initially pre-empted by a regular symbol, and later use SymbolBody::compare to choose between the regular symbol in the symbol table and the regular symbol from the combined LTO object file. This design seems to be sound, so long as the resolution mechanism is defined to be commutative and associative modulo arbitrary choices between symbols (which seems to be the case for COFF). Differential Revision: http://reviews.llvm.org/D10329 llvm-svn: 239563
2015-06-12 05:49:54 +08:00
; RUN: llvm-as -o %T/comdat-main.lto.obj %s
; RUN: llvm-as -o %T/comdat1.lto.obj %S/Inputs/lto-comdat1.ll
; RUN: llvm-as -o %T/comdat2.lto.obj %S/Inputs/lto-comdat2.ll
; RUN: rm -f %T/comdat.lto.lib
; RUN: llvm-ar cru %T/comdat.lto.lib %T/comdat1.lto.obj %T/comdat2.lto.obj
; RUN: llc -filetype=obj -o %T/comdat-main.obj %s
; RUN: llc -filetype=obj -o %T/comdat1.obj %S/Inputs/lto-comdat1.ll
; RUN: llc -filetype=obj -o %T/comdat2.obj %S/Inputs/lto-comdat2.ll
; RUN: rm -f %T/comdat.lib
; RUN: llvm-ar cru %T/comdat.lib %T/comdat1.obj %T/comdat2.obj
; RUN: lld -flavor link2 /out:%T/comdat-main.exe /entry:main /subsystem:console %T/comdat-main.lto.obj %T/comdat1.lto.obj %T/comdat2.lto.obj
; RUN: llvm-readobj -file-headers %T/comdat-main.exe | FileCheck -check-prefix=HEADERS-11 %s
; RUN: llvm-objdump -d %T/comdat-main.exe | FileCheck -check-prefix=TEXT-11 %s
; RUN: lld -flavor link2 /out:%T/comdat-main.exe /entry:main /subsystem:console %T/comdat-main.lto.obj %T/comdat.lto.lib
; RUN: llvm-readobj -file-headers %T/comdat-main.exe | FileCheck -check-prefix=HEADERS-11 %s
; RUN: llvm-objdump -d %T/comdat-main.exe | FileCheck -check-prefix=TEXT-11 %s
; RUN: lld -flavor link2 /out:%T/comdat-main.exe /entry:main /subsystem:console %T/comdat-main.obj %T/comdat1.lto.obj %T/comdat2.lto.obj
; RUN: llvm-readobj -file-headers %T/comdat-main.exe | FileCheck -check-prefix=HEADERS-01 %s
; RUN: llvm-objdump -d %T/comdat-main.exe | FileCheck -check-prefix=TEXT-01 %s
; RUN: lld -flavor link2 /out:%T/comdat-main.exe /entry:main /subsystem:console %T/comdat-main.obj %T/comdat.lto.lib
; RUN: llvm-readobj -file-headers %T/comdat-main.exe | FileCheck -check-prefix=HEADERS-01 %s
; RUN: llvm-objdump -d %T/comdat-main.exe | FileCheck -check-prefix=TEXT-01 %s
; RUN: lld -flavor link2 /out:%T/comdat-main.exe /entry:main /subsystem:console %T/comdat-main.lto.obj %T/comdat1.obj %T/comdat2.obj
; RUN: llvm-readobj -file-headers %T/comdat-main.exe | FileCheck -check-prefix=HEADERS-10 %s
; RUN: llvm-objdump -d %T/comdat-main.exe | FileCheck -check-prefix=TEXT-10 %s
; RUN: lld -flavor link2 /out:%T/comdat-main.exe /entry:main /subsystem:console %T/comdat-main.lto.obj %T/comdat.lib
; RUN: llvm-readobj -file-headers %T/comdat-main.exe | FileCheck -check-prefix=HEADERS-10 %s
; RUN: llvm-objdump -d %T/comdat-main.exe | FileCheck -check-prefix=TEXT-10 %s
; HEADERS-11: AddressOfEntryPoint: 0x1000
; TEXT-11: Disassembly of section .text:
; TEXT-11-NEXT: .text:
; TEXT-11-NEXT: xorl %eax, %eax
; TEXT-11-NEXT: retq
; HEADERS-01: AddressOfEntryPoint: 0x2000
; TEXT-01: Disassembly of section .text:
; TEXT-01-NEXT: .text:
; TEXT-01-NEXT: subq $40, %rsp
; TEXT-01-NEXT: callq 39
; TEXT-01-NEXT: callq 50
; TEXT-01-NEXT: callq 13
; TEXT-01-NEXT: xorl %eax, %eax
; TEXT-01-NEXT: addq $40, %rsp
; TEXT-01-NEXT: retq
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: retq
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: int3
; TEXT-01-NEXT: retq
; TEXT-01-NEXT: nopw %cs:(%rax,%rax)
; TEXT-01-NEXT: retq
; HEADERS-10: AddressOfEntryPoint: 0x2030
; TEXT-10: Disassembly of section .text:
; TEXT-10-NEXT: .text:
; TEXT-10-NEXT: subq $40, %rsp
; TEXT-10-NEXT: callq 7
; TEXT-10-NEXT: nop
; TEXT-10-NEXT: addq $40, %rsp
; TEXT-10-NEXT: retq
; TEXT-10-NEXT: int3
; TEXT-10-NEXT: retq
; TEXT-10-NEXT: int3
; TEXT-10-NEXT: int3
; TEXT-10-NEXT: int3
; TEXT-10-NEXT: int3
; TEXT-10-NEXT: int3
; TEXT-10-NEXT: int3
; TEXT-10-NEXT: int3
; TEXT-10-NEXT: int3
; TEXT-10-NEXT: int3
; TEXT-10-NEXT: int3
; TEXT-10-NEXT: int3
; TEXT-10-NEXT: int3
; TEXT-10-NEXT: int3
; TEXT-10-NEXT: int3
; TEXT-10-NEXT: int3
; TEXT-10-NEXT: subq $40, %rsp
; TEXT-10-NEXT: callq -25
; TEXT-10-NEXT: nop
; TEXT-10-NEXT: addq $40, %rsp
; TEXT-10-NEXT: retq
; TEXT-10-NEXT: int3
; TEXT-10-NEXT: subq $40, %rsp
; TEXT-10-NEXT: callq -57
; TEXT-10-NEXT: callq -30
; TEXT-10-NEXT: xorl %eax, %eax
; TEXT-10-NEXT: addq $40, %rsp
; TEXT-10-NEXT: retq
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-msvc"
$comdat = comdat any
define i32 @main() {
call void @f1()
call void @f2()
call void @comdat()
ret i32 0
}
define linkonce_odr void @comdat() comdat {
ret void
}
declare void @f1()
declare void @f2()