lld/test/wasm/tls_init_symbols.s

   1 # Regression test based on https://github.com/llvm/llvm-project/issues/54386
   2 # Test that that linker synthetic functions such as __wasm_tls_init and
   3 # __wasm_apply_global_tls_relocs can be created successfully in programs
   4 # that don't reference __tls_base or __wasm_tls_init.  These function both
   5 # reference __tls_base which need to be marks as alive if they are generated.
   6
   7 # This is very basic TLS-using program that doesn't reference any of the
   8 # linker-generated symbols.
   9
  10 # RUN: llvm-mc -filetype=obj -triple=wasm32-unknown-unknown -o %t.o %s
  11 # RUN: wasm-ld -no-gc-sections --shared-memory -o %t.wasm %t.o
  12 # RUN: obj2yaml %t.wasm | FileCheck %s
  13 # RUN: llvm-objdump -d --no-show-raw-insn --no-leading-addr %t.wasm | FileCheck %s --check-prefixes DIS
  14
  15 .globl _start
  16 _start:
  17   .functype _start () -> (i32)
  18   global.get tls_sym@GOT@TLS
  19   end_function
  20
  21 .section  .tdata.tls_sym,"",@
  22 .globl  tls_sym
  23 .p2align  2
  24 tls_sym:
  25   .int32  1
  26   .size tls_sym, 4
  27
  28 .section  .custom_section.target_features,"",@
  29   .int8 2
  30   .int8 43
  31   .int8 7
  32   .ascii  "atomics"
  33   .int8 43
  34   .int8 11
  35   .ascii  "bulk-memory"
  36
  37 # CHECK:       - Type:            CUSTOM
  38 # CHECK-NEXT:    Name:            name
  39 # CHECK-NEXT:    FunctionNames:
  40 # CHECK-NEXT:      - Index:           0
  41 # CHECK-NEXT:        Name:            __wasm_call_ctors
  42 # CHECK-NEXT:      - Index:           1
  43 # CHECK-NEXT:        Name:            __wasm_init_tls
  44 # CHECK-NEXT:      - Index:           2
  45 # CHECK-NEXT:        Name:            __wasm_init_memory
  46 # CHECK-NEXT:      - Index:           3
  47 # CHECK-NEXT:        Name:            __wasm_apply_global_tls_relocs
  48 # CHECK-NEXT:      - Index:           4
  49 # CHECK-NEXT:        Name:            _start
  50
  51 # DIS:       <__wasm_init_tls>:
  52 # DIS:        local.get 0
  53 # DIS-NEXT:   global.set  1
  54 # DIS-NEXT:   local.get 0
  55 # DIS-NEXT:   i32.const 0
  56 # DIS-NEXT:   i32.const 4
  57 # DIS-NEXT:   memory.init 0, 0
  58 # DIS-NEXT:   call  3
  59 # DIS-NEXT:   end
  60
  61 # DIS:      <__wasm_apply_global_tls_relocs>:
  62 # DIS:        global.get  1
  63 # DIS-NEXT:   i32.const 0
  64 # DIS-NEXT:   i32.add
  65 # DIS-NEXT:   global.set  4
  66 # DIS-NEXT:   end
  67
  68 # DIS:      <_start>:
  69 # DIS:        global.get  4
  70 # DIS-NEXT:   end
  71