sections-order.test

/*
Tests a simple linker script that changes the order of output sections and
also changes the address of output sections by using simple expressions.

This test uses three X86-64 input objects, prog1.o, prog2.o and prog3.o,
which were created with the following C or assembly code:

*** prog1.o:

(command line clang -c prog1.c -o prog1.o)

const char *prog2();
void write(int, const char *, int);

int main() {
  write(1, prog2(), 14);
}

*** prog2.o:

(command line clang -c prog2.c -o prog2.o)

const char *prog2() {
 return "Hello, world!\n";
}

*** prog3.o:

(command line clang -c prog3.S -o prog3.o)

      .globl write
write:
      mov $1, %eax
      syscall
      ret

      .globl _start
_start:
      call	main
      mov $60, %eax
      syscall
      ret

We use the following linker script for this test:
*/

ENTRY(_start)

SECTIONS
{
  . = 0x500000;
  .text : { prog1.o(.text) }
  .mystring : { prog2.o(.rodata.str1.1) }
  . = . + 0x6000;
  .text.2 : {prog3.o(.text) prog2.o(.text) }
}

/*
RUN: mkdir -p %T
RUN: yaml2obj -format=elf %p/Inputs/prog1.o.yaml -o=%T/prog1.o
RUN: yaml2obj -format=elf %p/Inputs/prog2.o.yaml -o=%T/prog2.o
RUN: yaml2obj -format=elf %p/Inputs/prog3.o.yaml -o=%T/prog3.o
RUN: cd %T

RUN: lld -flavor gnu  -target x86_64 -T %s prog1.o prog2.o prog3.o \
RUN:   -static -o %t1
RUN: llvm-readobj -s %t1 | FileCheck -check-prefix CHECKSECTIONS %s

CHECKSECTIONS:       Index: 1
CHECKSECTIONS:       Name: .text
CHECKSECTIONS:       Address: 0x500000
CHECKSECTIONS:       Size: 33

CHECKSECTIONS:       Index: 2
CHECKSECTIONS:       Name: .mystring
CHECKSECTIONS:       Address: 0x500021
CHECKSECTIONS:       Size: 15

CHECKSECTIONS:       Index: 3
CHECKSECTIONS:       Name: .text.2
CHECKSECTIONS:       Address: 0x506030
CHECKSECTIONS:       Size: 48

RUN: llvm-readobj -symbols %t1 | FileCheck -check-prefix CHECKSYMS %s

CHECKSYMS:      Name: main
CHECKSYMS-NEXT: Value: 0x500000

CHECKSYMS:      Name: write
CHECKSYMS-NEXT: Value: 0x506030

CHECKSYMS:      Name: _start
CHECKSYMS-NEXT: Value: 0x506038

CHECKSYMS:      Name: prog2
CHECKSYMS-NEXT: Value: 0x506050

RUN: llvm-readobj -program-headers %t1 | FileCheck -check-prefix CHECKPHDRS %s

CHECKPHDRS:           Type: PT_LOAD (0x1)
CHECKPHDRS:           Offset: 0x1000
CHECKPHDRS-NEXT:      VirtualAddress: 0x500000
CHECKPHDRS-NEXT:      PhysicalAddress: 0x500000
CHECKPHDRS-NEXT:      FileSize: 48
CHECKPHDRS-NEXT:      MemSize: 48

CHECKPHDRS:           Type: PT_LOAD (0x1)
CHECKPHDRS:           Offset: 0x2030
CHECKPHDRS-NEXT:      VirtualAddress: 0x506030
CHECKPHDRS-NEXT:      PhysicalAddress: 0x506030
CHECKPHDRS-NEXT:      FileSize: 168
CHECKPHDRS-NEXT:      MemSize: 168
*/