lld/test/MachO/common-symbol-coalescing.s

   1 # REQUIRES: x86
   2 # RUN: rm -rf %t; split-file %s %t
   3
   4 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/test.s -o %t/test.o
   5 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/same-size.s -o %t/same-size.o
   6 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/smaller-size.s -o %t/smaller-size.o
   7 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/zero-align.s -o %t/zero-align.o
   8 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/zero-align-round-up.s -o %t/zero-align-round-up.o
   9
  10 ## Check that we pick the definition with the larger size, regardless of
  11 ## its alignment.
  12 # RUN: %lld %t/test.o %t/smaller-size.o -order_file %t/order -o %t/test
  13 # RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#ALIGN=8
  14 # RUN: %lld %t/smaller-size.o %t/test.o -order_file %t/order -o %t/test
  15 # RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#ALIGN=8
  16
  17 ## When the sizes are equal, we pick the symbol whose file occurs later in the
  18 ## command-line argument list.
  19 # RUN: %lld %t/test.o %t/same-size.o -order_file %t/order -o %t/test
  20 # RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#ALIGN=16
  21 # RUN: %lld %t/same-size.o %t/test.o -order_file %t/order -o %t/test
  22 # RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#ALIGN=8
  23
  24 # RUN: %lld %t/test.o %t/zero-align.o -order_file %t/order -o %t/test
  25 # RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#ALIGN=16
  26 # RUN: %lld %t/zero-align.o %t/test.o -order_file %t/order -o %t/test
  27 # RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#ALIGN=16
  28
  29 # RUN: %lld %t/test.o %t/zero-align-round-up.o -order_file %t/order -o %t/test
  30 # RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#ALIGN=16
  31 # RUN: %lld %t/zero-align-round-up.o %t/test.o -order_file %t/order -o %t/test
  32 # RUN: llvm-objdump --section-headers --syms %t/test | FileCheck %s -D#ALIGN=16
  33
  34 # CHECK-LABEL: Sections:
  35 # CHECK:       __common      {{[0-9a-f]+}} [[#%.16x, COMMON_START:]]  BSS
  36
  37 # CHECK-LABEL: SYMBOL TABLE:
  38 # CHECK-DAG:   [[#%.16x, COMMON_START]]          g     O __DATA,__common _check_size
  39 # CHECK-DAG:   [[#%.16x, COMMON_START + 2]]      g     O __DATA,__common _end_marker
  40 # CHECK-DAG:   [[#%.16x, COMMON_START + ALIGN]]  g     O __DATA,__common _check_alignment
  41
  42 #--- order
  43 ## Order is important as we determine the size of a given symbol via the
  44 ## address of the next symbol.
  45 _check_size
  46 _end_marker
  47 _check_alignment
  48
  49 #--- smaller-size.s
  50 .comm _check_size, 1, 1
  51 .comm _check_alignment, 1, 4
  52
  53 #--- same-size.s
  54 .comm _check_size, 2, 1
  55 .comm _check_alignment, 2, 4
  56
  57 #--- zero-align.s
  58 .comm _check_size, 2, 1
  59 ## If alignment is set to zero, use the size to determine the alignment.
  60 .comm _check_alignment, 16, 0
  61
  62 #--- zero-align-round-up.s
  63 .comm _check_size, 2, 1
  64 ## If alignment is set to zero, use the size to determine the alignment. If the
  65 ## size is not a power of two, round it up. (In this case, 14 rounds to 16.)
  66 .comm _check_alignment, 14, 0
  67
  68 #--- test.s
  69 .comm _check_size, 2, 1
  70 .comm _end_marker, 1
  71 .comm _check_alignment, 2, 3
  72
  73 .globl _main
  74 _main:
  75   ret