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[OpenMP] Do not create offloading entries for internal or hidden symbols

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Currently we create offloading entries to register device variables with
the host. When we register a variable we will look up the symbol in the
device image and map the device address to the host address. This is a
problem when the symbol is declared with hidden visibility or internal
linkage. This means the symbol is not accessible externally and we
cannot get its address. We should still allow static variables to be
declared on the device, but ew should not create an offloading entry for
them so they exist independently on the host and device.

Fixes #54309

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D122352
This commit is contained in:
Joseph Huber 2022-03-23 17:05:43 -04:00
parent 955cff803e
commit 0d16c23af1
3 changed files with 37 additions and 2 deletions
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7
clang/lib/CodeGen/CGOpenMPRuntime.cpp
View File

@ -3325,6 +3325,13 @@ void CGOpenMPRuntime::createOffloadEntriesAndInfoMetadata() {
}
break;
}
// Hidden or internal symbols on the device are not externally visible. We
// should not attempt to register them by creating an offloading entry.
if (auto *GV = dyn_cast<llvm::GlobalValue>(CE->getAddress()))
if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
continue;
createOffloadEntry(CE->getAddress(), CE->getAddress(),
CE->getVarSize().getQuantity(), Flags,
CE->getLinkage());

30
clang/test/OpenMP/declare_target_visibility_codegen.cpp Normal file
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@ -0,0 +1,30 @@
// RUN: %clang_cc1 -verify -fopenmp -fopenmp-version=45 -fopenmp-targets=powerpc64le-ibm-linux-gnu -x c++ -triple x86_64-unknown-unknown -emit-llvm %s -o - | FileCheck %s --check-prefix=HOST
// expected-no-diagnostics
class C {
public:
//.
// HOST: @[[C:.+]] = internal global %class.C zeroinitializer, align 4
// HOST: @[[X:.+]] = internal global i32 0, align 4
// HOST: @y = hidden global i32 0
// HOST: @z = global i32 0
// HOST-NOT: @.omp_offloading.entry.c
// HOST-NOT: @.omp_offloading.entry.x
// HOST-NOT: @.omp_offloading.entry.y
// HOST: @.omp_offloading.entry.z
C() : x(0) {}
int x;
};
static C c;
#pragma omp declare target(c)
static int x;
#pragma omp declare target(x)
int __attribute__((visibility("hidden"))) y;
#pragma omp declare target(y)
int z;
#pragma omp declare target(z)

2
clang/test/OpenMP/nvptx_declare_target_var_ctor_dtor_codegen.cpp
View File

@ -72,8 +72,6 @@ S cd = doo() + car() + caz() + baz();
// DEVICE-DAG: call void
// DEVICE-DAG: ret void
// HOST-DAG: @.omp_offloading.entry_name{{.*}} = internal unnamed_addr constant [{{[0-9]+}} x i8] c"[[C_ADDR]]\00"
// HOST-DAG: @.omp_offloading.entry.[[C_ADDR]] = weak{{.*}} constant %struct.__tgt_offload_entry { i8* bitcast (i32* @[[C_ADDR]] to i8*), i8* getelementptr inbounds ([{{[0-9]+}} x i8], [{{[0-9]+}} x i8]* @.omp_offloading.entry_name{{.*}}, i32 0, i32 0), i64 4, i32 0, i32 0 }, section "omp_offloading_entries", align 1
// HOST-DAG: @.omp_offloading.entry_name{{.*}} = internal unnamed_addr constant [{{[0-9]+}} x i8] c"[[CD_ADDR]]\00"
// HOST-DAG: @.omp_offloading.entry.[[CD_ADDR]] = weak{{.*}} constant %struct.__tgt_offload_entry { i8* bitcast (%struct.S* @[[CD_ADDR]] to i8*), i8* getelementptr inbounds ([{{[0-9]+}} x i8], [{{[0-9]+}} x i8]* @.omp_offloading.entry_name{{.*}}, i32 0, i32 0), i64 4, i32 0, i32 0 }, section "omp_offloading_entries", align 1
// HOST-DAG: @.omp_offloading.entry_name{{.*}} = internal unnamed_addr constant [{{[0-9]+}} x i8] c"[[C_CTOR]]\00"