[PATCH] D78005: [yaml2obj] - Reimplement how tool calculates file and memory sizes of segments.

[George Rimar via Phabricator via llvm-commits]

grimar added a comment.

Sharing my experiments just in case. A possible example from real life is:

`test.s`:

  .section .foo.nobits, "aw", @nobits
  .quad 0
  
  .section .bar1.nobits, "aw", @nobits
  .quad 0
  .quad 0
  
  .section .bar2.nobits, "aw", @nobits
  .quad 0
  
  .section .zed, "aw"
  .quad 0
  .quad 0
  .quad 0

`test.script:`

  SECTIONS { 
   . = 0x1000;
   .foo.nobits : { *(.foo.nobits) }
   . = 0x1100;
   .zed : { *(.zed) }
   .bar1.nobits : { *(.bar.nobits) }
   .bar2.nobits : { *(.bar.nobits) }
  }

The output from bfd:

  Section Headers:
    [Nr] Name              Type             Address           Offset
         Size              EntSize          Flags  Link  Info  Align
    [ 0]                   NULL             0000000000000000  00000000
         0000000000000000  0000000000000000           0     0     0
    [ 1] .foo.nobits       NOBITS           0000000000001000  00001000
         0000000000000008  0000000000000000  WA       0     0     1
    [ 2] .zed              PROGBITS         0000000000001100  00001100
         0000000000000018  0000000000000000  WA       0     0     1
    [ 3] .bar1.nobits      NOBITS           0000000000001118  00001118
         0000000000000010  0000000000000000  WA       0     0     1
    [ 4] .bar2.nobits      NOBITS           0000000000001128  00001118
         0000000000000008  0000000000000000  WA       0     0     1
  
  Program Headers:
    Type           Offset             VirtAddr           PhysAddr
                   FileSiz            MemSiz              Flags  Align
    LOAD           0x0000000000001000 0x0000000000001000 0x0000000000001000
                   0x0000000000000118 0x0000000000000130  RW     0x1000

With this patch we should be able to describe such objects properly.


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  https://reviews.llvm.org/D78005/new/

https://reviews.llvm.org/D78005