# REQUIRES: arm
# RUN: rm -rf %t && split-file %s %t && cd %t
# RUN: llvm-mc -filetype=obj -triple=armv7-linux-gnueabi a.s -o a.o

## If we don't merge adjacent duplicate entries, __code_size will be negative and
## . += __code_size will trigger a "move location counter backward" error.
## LLD may report more errors further down, but there is only one "move location counter backward" error.
# RUN: not ld.lld -z norelro -z max-page-size=4096 -T a.t a.o -o /dev/null --no-merge-exidx-entries 2>&1 | \
# RUN:   FileCheck %s --check-prefix=ERR --implicit-check-not=error:

# ERR:      error: a.t:9: unable to move location counter (0x1000) backward to 0xf6c for section 'dummy1'
# ERR-NEXT: error: a.t:10: unable to move location counter (0x2000) backward to 0x1f6c for section 'dummy2'
# ERR-NEXT: error: a.t:14: unable to move location counter (0x4104) backward to 0x4070 for section 'code.unused_space'
# ERR-NEXT: error: section '.ARM.exidx' will not fit in region 'CODE': overflowed by 148 bytes
# ERR-NEXT: error: section dummy1 at 0x1000 of size 0xFFFFFFFFFFFFFF6C exceeds available address space
# ERR-NEXT: error: section dummy2 at 0x2000 of size 0xFFFFFFFFFFFFFF6C exceeds available address space
# ERR-NEXT: error: section code.unused_space at 0x4104 of size 0xFFFFFFFFFFFFFF6C exceeds available address space

## If we merge adjacent duplicate entries, we will have enough space. Don't report
## a spurious error https://github.com/llvm/llvm-project/issues/66836
# RUN: ld.lld -z norelro -z max-page-size=4096 -T a.t a.o -o a
# RUN: llvm-readelf -S a | FileCheck %s

# CHECK:       [Nr] Name              Type            Address  Off    Size   ES Flg Lk Inf Al
# CHECK-NEXT:  [ 0]                   NULL            00000000 000000 000000 00      0   0  0
# CHECK-NEXT:  [ 1] dummy1            NOBITS          00001000 001000 00000c 00   A  0   0  1
# CHECK-NEXT:  [ 2] dummy2            NOBITS          00002000 001000 00000c 00   A  0   0  1
# CHECK-NEXT:  [ 3] .text             PROGBITS        00004000 001000 000054 00  AX  0   0  4
# CHECK-NEXT:  [ 4] .ARM.exidx        ARM_EXIDX       00004054 001054 000010 00  AL  3   0  4
# CHECK-NEXT:  [ 5] code.unused_space NOBITS          00004064 001064 00000c 00   A  0   0  1

#--- a.s
.globl _start
_start:
  bx lr

.macro A
.section .text.f\@,"ax"
.globl f\@
f\@:
.fnstart
  bx lr
.cantunwind
.fnend
.endm

.rept 20
  A
.endr

#--- a.t
MEMORY {
  DUMMY1 (RW) : ORIGIN = 0x1000, LENGTH = 0x70
  DUMMY2 (RW) : ORIGIN = 0x2000, LENGTH = 0x70
  CODE (RX) : ORIGIN = 0x4000, LENGTH = 0x70
}
code_end = ORIGIN(CODE) + LENGTH(CODE);

SECTIONS {
  dummy1 (NOLOAD) : { . += code_size; } > DUMMY1
  dummy2 (NOLOAD) : { . += code_size; } > DUMMY2
  .text : { *(.text .text.*) } > CODE
  .ARM.exidx : { *(.ARM.exidx .ARM.exidx.*) } > CODE
  code_size = code_end - .;
  code.unused_space (NOLOAD) : { . += code_size; } > CODE
}