lld/test/ELF/linkerscript/Inputs/arm-thunk-many-passes.s

   1 // An example of thunk generation that takes the maximum number of permitted
   2 // passes to converge. We start with a set of branches of which all but one are
   3 // in range. Any thunk added to extend the range of a branch is inserted in
   4 // between the branches and the targets which knocks some more branches out
   5 // of range. At the end of 9 passes of createThunks() every branch has a
   6 // range extension thunk, allowing the final pass to check that no more thunks
   7 // are required.
   8 //
   9 // As the size of the .text section changes 9 times, the symbol sym which
  10 // depends on the size of .text will be updated 9 times. This test checks that
  11 // any iteration limit to updating symbols does not limit thunk convergence.
  12 // up to its pass limit without
  13
  14         .thumb
  15         .section .text.00, "ax", %progbits
  16         .globl _start
  17         .thumb_func
  18 _start: b.w f2
  19         b.w f2
  20         b.w f3
  21         b.w f3
  22         b.w f4
  23         b.w f4
  24         b.w f5
  25         b.w f5
  26         b.w f6
  27         b.w f6
  28         b.w f7
  29         b.w f7
  30         b.w f8
  31         b.w f8
  32         b.w f9
  33         b.w f9
  34         b.w f10
  35         b.w f10
  36
  37         .section .text.01, "ax", %progbits
  38         .space 14 * 1024 * 1024
  39 // Thunks are inserted here, initially only 1 branch is out of range and needs
  40 // a thunk. However the added thunk is 4-bytes in size which makes another
  41 // branch out of range, which adds another thunk ...
  42         .section .text.02, "ax", %progbits
  43         .space (2 * 1024 * 1024) - 68
  44         .thumb_func
  45 f2:     bx lr
  46         nop
  47         .thumb_func
  48 f3:     bx lr
  49         nop
  50         .thumb_func
  51 f4:     bx lr
  52         nop
  53         .thumb_func
  54 f5:     bx lr
  55         nop
  56         .thumb_func
  57 f6:     bx lr
  58         nop
  59         .thumb_func
  60 f7:     bx lr
  61         nop
  62         .thumb_func
  63 f8:     bx lr
  64         nop
  65         .thumb_func
  66 f9:     bx lr
  67         nop
  68         .thumb_func
  69 f10:     bx lr
  70         nop