2016-03-05 08:09:37 +08:00
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; REQUIRES: x86
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; RUN: llvm-as %s -o %t1.o
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; RUN: llvm-mc -triple=x86_64-pc-linux %p/Inputs/visibility.s -o %t2.o -filetype=obj
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2018-01-17 01:34:26 +08:00
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; RUN: ld.lld %t1.o %t2.o -o %t.so -shared -save-temps
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; RUN: llvm-dis < %t.so.0.2.internalize.bc | FileCheck --check-prefix=IR %s
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2019-05-01 13:49:01 +08:00
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; RUN: llvm-readobj --symbols %t.so | FileCheck %s
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2016-03-05 08:09:37 +08:00
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; CHECK: Name: g
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; CHECK-NEXT: Value: 0x1000
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; CHECK-NEXT: Size: 0
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; CHECK-NEXT: Binding: Local
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; CHECK-NEXT: Type: None
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2016-03-25 00:30:20 +08:00
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; CHECK-NEXT: Other [ (0x2)
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; CHECK-NEXT: STV_HIDDEN
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; CHECK-NEXT: ]
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2016-03-05 08:09:37 +08:00
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; CHECK-NEXT: Section: .text
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2016-03-08 01:14:36 +08:00
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; CHECK: Name: a
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[ELF] Simplify RelRo, TLS, NOBITS section ranks and make RW PT_LOAD start with RelRo
Old: PT_LOAD(.data | PT_GNU_RELRO(.data.rel.ro .bss.rel.ro) | .bss)
New: PT_LOAD(PT_GNU_RELRO(.data.rel.ro .bss.rel.ro) | .data .bss)
The placement of | indicates page alignment caused by PT_GNU_RELRO. The
new layout has simpler rules and saves space for many cases.
Old size: roundup(.data) + roundup(.data.rel.ro)
New size: roundup(.data.rel.ro + .bss.rel.ro) + .data
Other advantages:
* At runtime the 3 memory mappings decrease to 2.
* start(PT_TLS) = start(PT_GNU_RELRO) = start(RW PT_LOAD). This
simplifies binary manipulation tools.
GNU strip before 2.31 discards PT_GNU_RELRO if its
address is not equal to the start of its associated PT_LOAD.
This has been fixed by https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=f2731e0c374e5323ce4cdae2bcc7b7fe22da1a6f
But with this change, we will be compatible with GNU strip before 2.31
* Before, .got.plt (non-relro by default) was placed before .got (relro
by default), which made it impossible to have _GLOBAL_OFFSET_TABLE_
(start of .got.plt on x86-64) equal to the end of .got (R_GOT*_FROM_END)
(https://bugs.llvm.org/show_bug.cgi?id=36555). With the new ordering, we
can improve on this regard if we'd like to.
Reviewers: ruiu, espindola, pcc
Subscribers: emaste, arichardson, llvm-commits, joerg, jdoerfert
Differential Revision: https://reviews.llvm.org/D56828
llvm-svn: 356117
2019-03-14 11:47:45 +08:00
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; CHECK-NEXT: Value: 0x3000
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2016-03-08 01:14:36 +08:00
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; CHECK-NEXT: Size: 0
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; CHECK-NEXT: Binding: Local
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; CHECK-NEXT: Type: None
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2016-03-25 00:30:20 +08:00
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; CHECK-NEXT: Other [ (0x2)
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; CHECK-NEXT: STV_HIDDEN
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; CHECK-NEXT: ]
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2016-03-08 01:14:36 +08:00
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; CHECK-NEXT: Section: .data
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2019-08-28 01:46:53 +08:00
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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2016-03-05 08:09:37 +08:00
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target triple = "x86_64-unknown-linux-gnu"
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declare hidden void @g()
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2018-01-18 10:08:32 +08:00
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; IR: declare hidden void @g()
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2018-01-17 01:34:26 +08:00
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2016-03-05 08:09:37 +08:00
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define void @f() {
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call void @g()
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ret void
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}
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2016-03-08 01:14:36 +08:00
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@a = weak hidden global i32 42
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