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llvm-mirror/test/CodeGen/X86/no-plt.ll
Fangrui Song 556dfb9bf9 [TargetMachine] Don't imply dso_local on function declarations in Reloc::Static model for ELF/wasm
clang/lib/CodeGen/CodeGenModule sets dso_local on applicable function declarations,
we don't need to duplicate the work in TargetMachine:shouldAssumeDSOLocal.
(Actually the long-term goal (started by r324535) is to drop TargetMachine::shouldAssumeDSOLocal.)

By not implying dso_local, we will respect dso_local/dso_preemptable specifiers
set by the frontend. This allows the proposed -fno-direct-access-external-data
option to work with -fno-pic and prevent a canonical PLT entry (SHN_UNDEF with non-zero st_value)
when taking the address of a function symbol.

This patch should be NFC in terms of the Clang emitted assembly because the case
we don't set dso_local is a case Clang sets dso_local. However, some tests don't
set dso_local on some function declarations and expose some differences. Most
tests have been fixed to be more robust in the previous commit.
2020-12-05 14:54:37 -08:00

46 lines
1.4 KiB
LLVM

; RUN: llc < %s -mcpu=generic -mtriple=x86_64-linux-gnu -relocation-model=pic \
; RUN: | FileCheck -check-prefix=X64 --check-prefix=PIC %s
; RUN: llc < %s -mcpu=generic -mtriple=x86_64-linux-gnu \
; RUN: | FileCheck -check-prefix=X64 --check-prefix=STATIC %s
define i32 @fp_weakfunc() {
; X64: weakfunc@GOTPCREL(%rip)
ret i32 select (i1 icmp ne (i32 ()* @weakfunc, i32 ()* null), i32 1, i32 0)
}
declare extern_weak i32 @weakfunc() nonlazybind
define void @memset_call(i8* nocapture %a, i8 %c, i32 %n) {
; X64: callq *memset@GOTPCREL(%rip)
call void @llvm.memset.p0i8.i32(i8* %a, i8 %c, i32 %n, i1 false)
ret void
}
define void @memcpy_call(i8* nocapture %a, i8* nocapture readonly %b, i64 %n) {
; X64: callq *memcpy@GOTPCREL(%rip)
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %a, i8* %b, i64 %n, i32 1, i1 false)
ret void
}
define i32 @main() {
; X64: callq *foo@GOTPCREL(%rip)
; PIC: callq bar@PLT
; STATIC: callq bar@PLT
; X64: callq baz
%retval = alloca i32, align 4
store i32 0, i32* %retval, align 4
%call1 = call i32 @foo()
%call2 = call i32 @bar()
%call3 = call i32 @baz()
ret i32 0
}
declare i32 @foo() nonlazybind
declare i32 @bar()
declare hidden i32 @baz() nonlazybind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i32, i1)
declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i1)
!llvm.module.flags = !{!1}
!1 = !{i32 7, !"RtLibUseGOT", i32 1}