| # REQUIRES: x86 |
| ## Keep st_type for simple assignment (`alias = aliasee`). This property is |
| ## desired on some targets, where symbol types can affect relocation processing |
| ## (e.g. Thumb interworking). However, the st_size field should not be retained |
| ## because some tools use st_size=0 as a heuristic to detect aliases. With any |
| ## operation, it can be argued that the new symbol may not be of the same type, |
| ## so reset st_type to STT_NOTYPE. |
| |
| ## NOTE: GNU ld retains st_type for many operations. |
| |
| # RUN: split-file %s %t |
| # RUN: llvm-mc -filetype=obj -triple=x86_64 %t/main.s -o %t.o |
| # RUN: ld.lld -T %t/a.lds %t.o -o %t1 |
| # RUN: llvm-readelf -s %t1 | FileCheck %s |
| |
| # CHECK: Size Type Bind Vis Ndx Name |
| # CHECK: 1 FUNC GLOBAL DEFAULT 1 _start |
| # CHECK: 0 FUNC GLOBAL DEFAULT 1 retain1 |
| # CHECK-NEXT: 0 FUNC GLOBAL DEFAULT 1 retain2 |
| # CHECK-NEXT: 0 NOTYPE GLOBAL DEFAULT 1 drop1 |
| # CHECK-NEXT: 0 NOTYPE GLOBAL DEFAULT ABS drop2 |
| # CHECK-NEXT: 0 NOTYPE GLOBAL DEFAULT ABS drop3 |
| |
| # RUN: ld.lld --defsym 'retain=_start' --defsym 'drop=_start+0' %t.o -o %t2 |
| # RUN: llvm-readelf -s %t2 | FileCheck %s --check-prefix=DEFSYM |
| |
| # DEFSYM: 0 FUNC GLOBAL DEFAULT 1 retain |
| # DEFSYM-NEXT: 0 NOTYPE GLOBAL DEFAULT 1 drop |
| |
| #--- a.lds |
| retain1 = _start; |
| retain2 = 1 ? _start : 0; |
| |
| ## Reset to STT_NOTYPE if any operation is performed, |
| ## even if the operation is an identity function. |
| drop1 = _start + 0; |
| drop2 = 0 ? _start : 1; |
| drop3 = -_start; |
| |
| #--- main.s |
| .globl _start |
| .type _start, @function |
| _start: |
| ret |
| .size _start, 1 |
