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6a96e17cac
Currently we do not represent runtime preemption in the IR, which has several
drawbacks:
1) The semantics of GlobalValues differ depending on the object file format
you are targeting (as well as the relocation-model and -fPIE value).
2) We have no way of disabling inlining of run time interposable functions,
since in the IR we only know if a function is link-time interposable.
Because of this llvm cannot support elf-interposition semantics.
3) In LTO builds of executables we will have extra knowledge that a symbol
resolved to a local definition and can't be preemptable, but have no way to
propagate that knowledge through the compiler.
This patch adds preemptability specifiers to the IR with the following meaning:
dso_local --> means the compiler may assume the symbol will resolve to a
definition within the current linkage unit and the symbol may be accessed
directly even if the definition is not within this compilation unit.
dso_preemptable --> means that the compiler must assume the GlobalValue may be
replaced with a definition from outside the current linkage unit at runtime.
To ease transitioning dso_preemptable is treated as a 'default' in that
low-level codegen will still do the same checks it did previously to see if a
symbol should be accessed indirectly. Eventually when IR producers emit the
specifiers on all Globalvalues we can change dso_preemptable to mean 'always
access indirectly', and remove the current logic.
Differential Revision: https://reviews.llvm.org/D20217
llvm-svn: 316668
252 lines
9.5 KiB
LLVM
252 lines
9.5 KiB
LLVM
; RUN: llc -mtriple x86_64-apple-darwin \
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; RUN: -relocation-model=static < %s | FileCheck %s
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; RUN: llc -mtriple x86_64-apple-darwin \
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; RUN: -relocation-model=pic < %s | FileCheck %s
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; RUN: llc -mtriple x86_64-apple-darwin \
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; RUN: -relocation-model=dynamic-no-pic < %s | FileCheck %s
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; 32 bits
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; RUN: llc -mtriple i386-apple-darwin \
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; RUN: -relocation-model=static < %s | FileCheck --check-prefix=DARWIN32_S %s
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; RUN: llc -mtriple i386-apple-darwin \
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; RUN: -relocation-model=pic < %s | FileCheck --check-prefix=DARWIN32 %s
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; RUN: llc -mtriple i386-apple-darwin \
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; RUN: -relocation-model=dynamic-no-pic < %s | \
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; RUN: FileCheck --check-prefix=DARWIN32_DNP %s
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; globals
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@strong_default_global = global i32 42
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define i32* @get_strong_default_global() {
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ret i32* @strong_default_global
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}
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; CHECK: leaq _strong_default_global(%rip), %rax
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; DARWIN32: leal _strong_default_global-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_strong_default_global, %eax
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; DARWIN32_DNP: movl $_strong_default_global, %eax
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@weak_default_global = weak global i32 42
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define i32* @get_weak_default_global() {
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ret i32* @weak_default_global
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}
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; CHECK: movq _weak_default_global@GOTPCREL(%rip), %rax
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; DARWIN32: movl L_weak_default_global$non_lazy_ptr-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_weak_default_global, %eax
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; DARWIN32_DNP: movl L_weak_default_global$non_lazy_ptr, %eax
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@external_default_global = external global i32
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define i32* @get_external_default_global() {
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ret i32* @external_default_global
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}
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; CHECK: movq _external_default_global@GOTPCREL(%rip), %rax
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; DARWIN32: movl L_external_default_global$non_lazy_ptr-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_external_default_global, %eax
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; DARWIN32_DNP: movl L_external_default_global$non_lazy_ptr, %eax
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@strong_local_global = dso_local global i32 42
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define i32* @get_strong_local_global() {
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ret i32* @strong_local_global
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}
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; CHECK: leaq _strong_local_global(%rip), %rax
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; DARWIN32: leal _strong_local_global-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_strong_local_global, %eax
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; DARWIN32_DNP: movl $_strong_local_global, %eax
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@weak_local_global = weak dso_local global i32 42
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define i32* @get_weak_local_global() {
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ret i32* @weak_local_global
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}
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; CHECK: leaq _weak_local_global(%rip), %rax
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; DARWIN32: leal _weak_local_global-L{{.}}$pb(%eax), %eax
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; DARWIN32_S: movl $_weak_local_global, %eax
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; DARWIN32_DNP: movl $_weak_local_global, %eax
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@external_local_global = external dso_local global i32
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define i32* @get_external_local_global() {
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ret i32* @external_local_global
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}
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; CHECK: leaq _external_local_global(%rip), %rax
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; DARWIN32: movl L_external_local_global$non_lazy_ptr-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_external_local_global, %eax
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; DARWIN32_DNP: movl $_external_local_global, %eax
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@strong_preemptable_global = dso_preemptable global i32 42
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define i32* @get_strong_preemptable_global() {
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ret i32* @strong_preemptable_global
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}
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; CHECK: leaq _strong_preemptable_global(%rip), %rax
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; DARWIN32: leal _strong_preemptable_global-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_strong_preemptable_global, %eax
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; DARWIN32_DNP: movl $_strong_preemptable_global, %eax
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@weak_preemptable_global = weak dso_preemptable global i32 42
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define i32* @get_weak_preemptable_global() {
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ret i32* @weak_preemptable_global
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}
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; CHECK: movq _weak_preemptable_global@GOTPCREL(%rip), %rax
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; DARWIN32: movl L_weak_preemptable_global$non_lazy_ptr-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_weak_preemptable_global, %eax
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; DARWIN32_DNP: movl L_weak_preemptable_global$non_lazy_ptr, %eax
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@external_preemptable_global = external dso_preemptable global i32
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define i32* @get_external_preemptable_global() {
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ret i32* @external_preemptable_global
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}
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; CHECK: movq _external_preemptable_global@GOTPCREL(%rip), %rax
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; DARWIN32: movl L_external_preemptable_global$non_lazy_ptr-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_external_preemptable_global, %eax
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; DARWIN32_DNP: movl L_external_preemptable_global$non_lazy_ptr, %eax
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; aliases
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@aliasee = global i32 42
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@strong_default_alias = alias i32, i32* @aliasee
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define i32* @get_strong_default_alias() {
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ret i32* @strong_default_alias
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}
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; CHECK: leaq _strong_default_alias(%rip), %rax
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; DARWIN32: leal _strong_default_alias-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_strong_default_alias, %eax
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; DARWIN32_DNP: movl $_strong_default_alias, %eax
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@weak_default_alias = weak alias i32, i32* @aliasee
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define i32* @get_weak_default_alias() {
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ret i32* @weak_default_alias
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}
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; CHECK: movq _weak_default_alias@GOTPCREL(%rip), %rax
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; DARWIN32: movl L_weak_default_alias$non_lazy_ptr-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_weak_default_alias, %eax
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; DARWIN32_DNP: movl L_weak_default_alias$non_lazy_ptr, %eax
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@strong_local_alias = dso_local alias i32, i32* @aliasee
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define i32* @get_strong_local_alias() {
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ret i32* @strong_local_alias
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}
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; CHECK: leaq _strong_local_alias(%rip), %rax
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; DARWIN32: leal _strong_local_alias-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_strong_local_alias, %eax
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; DARWIN32_DNP: movl $_strong_local_alias, %eax
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@weak_local_alias = weak dso_local alias i32, i32* @aliasee
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define i32* @get_weak_local_alias() {
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ret i32* @weak_local_alias
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}
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; CHECK: leaq _weak_local_alias(%rip), %rax
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; DARWIN32: leal _weak_local_alias-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_weak_local_alias, %eax
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; DARWIN32_DNP: movl $_weak_local_alias, %eax
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@strong_preemptable_alias = dso_preemptable alias i32, i32* @aliasee
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define i32* @get_strong_preemptable_alias() {
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ret i32* @strong_preemptable_alias
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}
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; CHECK: leaq _strong_preemptable_alias(%rip), %rax
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; DARWIN32: leal _strong_preemptable_alias-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_strong_preemptable_alias, %eax
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; DARWIN32_DNP: movl $_strong_preemptable_alias, %eax
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@weak_preemptable_alias = weak dso_preemptable alias i32, i32* @aliasee
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define i32* @get_weak_preemptable_alias() {
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ret i32* @weak_preemptable_alias
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}
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; CHECK: movq _weak_preemptable_alias@GOTPCREL(%rip), %rax
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; DARWIN32: movl L_weak_preemptable_alias$non_lazy_ptr-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_weak_preemptable_alias, %eax
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; DARWIN32_DNP: movl L_weak_preemptable_alias$non_lazy_ptr, %eax
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; functions
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define void @strong_default_function() {
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ret void
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}
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define void()* @get_strong_default_function() {
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ret void()* @strong_default_function
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}
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; CHECK: leaq _strong_default_function(%rip), %rax
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; DARWIN32: leal _strong_default_function-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_strong_default_function, %eax
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; DARWIN32_DNP: movl $_strong_default_function, %eax
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define weak void @weak_default_function() {
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ret void
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}
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define void()* @get_weak_default_function() {
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ret void()* @weak_default_function
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}
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; CHECK: movq _weak_default_function@GOTPCREL(%rip), %rax
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; DARWIN32: movl L_weak_default_function$non_lazy_ptr-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_weak_default_function, %eax
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; DARWIN32_DNP: movl L_weak_default_function$non_lazy_ptr, %eax
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declare void @external_default_function()
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define void()* @get_external_default_function() {
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ret void()* @external_default_function
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}
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; CHECK: movq _external_default_function@GOTPCREL(%rip), %rax
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; DARWIN32: movl L_external_default_function$non_lazy_ptr-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_external_default_function, %eax
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; DARWIN32_DNP: movl L_external_default_function$non_lazy_ptr, %eax
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define dso_local void @strong_local_function() {
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ret void
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}
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define void()* @get_strong_local_function() {
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ret void()* @strong_local_function
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}
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; CHECK: leaq _strong_local_function(%rip), %rax
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; DARWIN32: leal _strong_local_function-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_strong_local_function, %eax
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; DARWIN32_DNP: movl $_strong_local_function, %eax
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define weak dso_local void @weak_local_function() {
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ret void
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}
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define void()* @get_weak_local_function() {
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ret void()* @weak_local_function
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}
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; CHECK: leaq _weak_local_function(%rip), %rax
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; DARWIN32: leal _weak_local_function-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_weak_local_function, %eax
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; DARWIN32_DNP: movl $_weak_local_function, %eax
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declare dso_local void @external_local_function()
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define void()* @get_external_local_function() {
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ret void()* @external_local_function
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}
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; CHECK: leaq _external_local_function(%rip), %rax
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; DARWIN32: movl L_external_local_function$non_lazy_ptr-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_external_local_function, %eax
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; DARWIN32_DNP: movl $_external_local_function, %eax
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define dso_preemptable void @strong_preemptable_function() {
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ret void
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}
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define void()* @get_strong_preemptable_function() {
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ret void()* @strong_preemptable_function
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}
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; CHECK: leaq _strong_preemptable_function(%rip), %rax
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; DARWIN32: leal _strong_preemptable_function-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_strong_preemptable_function, %eax
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; DARWIN32_DNP: movl $_strong_preemptable_function, %eax
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define weak dso_preemptable void @weak_preemptable_function() {
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ret void
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}
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define void()* @get_weak_preemptable_function() {
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ret void()* @weak_preemptable_function
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}
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; CHECK: movq _weak_preemptable_function@GOTPCREL(%rip), %rax
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; DARWIN32: movl L_weak_preemptable_function$non_lazy_ptr-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_weak_preemptable_function, %eax
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; DARWIN32_DNP: movl L_weak_preemptable_function$non_lazy_ptr, %eax
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declare dso_preemptable void @external_preemptable_function()
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define void()* @get_external_preemptable_function() {
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ret void()* @external_preemptable_function
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}
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; CHECK: movq _external_preemptable_function@GOTPCREL(%rip), %rax
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; DARWIN32: movl L_external_preemptable_function$non_lazy_ptr-L{{.*}}$pb(%eax), %eax
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; DARWIN32_S: movl $_external_preemptable_function, %eax
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; DARWIN32_DNP: movl L_external_preemptable_function$non_lazy_ptr, %eax
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