lld/test/COFF/link-dll.s

   1 # REQUIRES: x86
   2
   3 ## Test creating a DLL and linking against the DLL without using an import
   4 ## library.
   5
   6 ## Explicitly creating an import library but naming it differently than the
   7 ## DLL, to avoid any risk of implicitly referencing it instead of the DLL
   8 ## itself.
   9
  10 ## Linking the executable with -opt:noref, to make sure that we don't
  11 ## pull in more import entries than what's needed, even if not running GC.
  12
  13 # RUN: split-file %s %t.dir
  14
  15 # RUN: llvm-mc -filetype=obj -triple=x86_64-windows-gnu %t.dir/lib.s -o %t.lib.o
  16 # RUN: lld-link -noentry -dll -def:%t.dir/lib.def %t.lib.o -out:%t.lib.dll -implib:%t.implib.lib
  17 # RUN: llvm-mc -filetype=obj -triple=x86_64-windows-gnu %t.dir/main.s -o %t.main.o
  18 # RUN: lld-link -lldmingw %t.main.o -out:%t.main.exe %t.lib.dll -opt:noref -verbose 2>&1 | FileCheck --check-prefix=LOG %s
  19 # RUN: llvm-readobj --coff-imports %t.main.exe | FileCheck %s
  20
  21 #--- lib.s
  22 .text
  23 .global func1
  24 func1:
  25   ret
  26 .global func2
  27 func2:
  28   ret
  29 .global func3
  30 func3:
  31   ret
  32 .data
  33 .global variable
  34 variable:
  35   .int 42
  36
  37 #--- lib.def
  38 EXPORTS
  39 func1
  40 func2
  41 func3
  42 variable
  43
  44 #--- main.s
  45 .text
  46 .global mainCRTStartup
  47 mainCRTStartup:
  48   call func2
  49   movq .refptr.variable(%rip), %rax
  50   movl (%rax), %eax
  51   ret
  52
  53 .section .rdata$.refptr.variable,"dr",discard,.refptr.variable
  54 .globl .refptr.variable
  55 .refptr.variable:
  56   .quad variable
  57
  58 # CHECK:      Import {
  59 # CHECK-NEXT:   Name: link-dll.s.tmp.lib.dll
  60 # CHECK-NEXT:   ImportLookupTableRVA:
  61 # CHECK-NEXT:   ImportAddressTableRVA
  62 # CHECK-NEXT:   Symbol: func2
  63 # CHECK-NEXT:   Symbol: variable
  64 # CHECK-NEXT: }
  65
  66 # LOG: Automatically importing variable from link-dll.s.tmp.lib.dll