lld/test/COFF/wrap-dllimport.s

   1 // REQUIRES: x86
   2
   3 // Check that we can wrap a dllimported symbol, so that references to
   4 // __imp_<symbol> gets redirected to a defined local import instead.
   5
   6 // RUN: split-file %s %t.dir
   7 // RUN: llvm-mc -filetype=obj -triple=i686-win32-gnu %t.dir/main.s -o %t.main.obj
   8 // RUN: llvm-mc -filetype=obj -triple=i686-win32-gnu %t.dir/other.s -o %t.other.obj
   9
  10 // RUN: lld-link -dll -out:%t.dll %t.other.obj -noentry -safeseh:no -export:foo -implib:%t.lib
  11 // RUN: lld-link -out:%t.exe %t.main.obj %t.lib -entry:entry -subsystem:console -debug:symtab -safeseh:no -wrap:foo -lldmap:%t.map
  12 // RUN: llvm-objdump -s -d --print-imm-hex %t.exe | FileCheck %s
  13
  14 // CHECK:      Contents of section .rdata:
  15 // CHECK-NEXT:  402000 06104000
  16
  17 // CHECK:      Disassembly of section .text:
  18 // CHECK-EMPTY:
  19 // CHECK:      00401000 <_entry>:
  20 // CHECK-NEXT:   401000: ff 25 00 20 40 00             jmpl    *0x402000
  21 // CHECK-EMPTY:
  22 // CHECK-NEXT: 00401006 <___wrap_foo>:
  23 // CHECK-NEXT:   401006: c3                            retl
  24
  25 // The jmpl instruction in _entry points at an address in 0x402000,
  26 // which is the first 4 bytes of the .rdata section (above), which is a
  27 // pointer that points at ___wrap_foo.
  28
  29 #--- main.s
  30 .global _entry
  31 _entry:
  32   jmpl *__imp__foo
  33
  34 .global ___wrap_foo
  35 ___wrap_foo:
  36   ret
  37
  38 #--- other.s
  39 .global _foo
  40
  41 _foo:
  42   ret