jdoerfert updated this revision to Diff 342419.
jdoerfert added a comment.

Fix tests by not always emitting a definition for omp allocate


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D101030/new/

https://reviews.llvm.org/D101030

Files:
  clang/include/clang/Basic/Attr.td
  clang/include/clang/Basic/DiagnosticParseKinds.td
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/include/clang/Parse/Parser.h
  clang/include/clang/Sema/Sema.h
  clang/lib/AST/AttrImpl.cpp
  clang/lib/CodeGen/CGDecl.cpp
  clang/lib/CodeGen/CGOpenMPRuntime.cpp
  clang/lib/CodeGen/CodeGenModule.cpp
  clang/lib/CodeGen/CodeGenModule.h
  clang/lib/Parse/ParseOpenMP.cpp
  clang/lib/Sema/SemaDecl.cpp
  clang/lib/Sema/SemaOpenMP.cpp
  clang/test/OpenMP/allocate_codegen.cpp
  clang/test/OpenMP/declare_target_codegen.cpp
  clang/test/OpenMP/declare_target_codegen_globalization.cpp
  clang/test/OpenMP/declare_target_device_only_compilation.cpp
  clang/test/OpenMP/declare_target_messages.cpp
  clang/test/OpenMP/declare_target_only_one_side_compilation.cpp
  clang/test/OpenMP/nvptx_allocate_codegen.cpp
  clang/test/OpenMP/nvptx_declare_target_var_ctor_dtor_codegen.cpp
  clang/test/OpenMP/nvptx_declare_variant_name_mangling.cpp
  llvm/include/llvm/Frontend/OpenMP/OMP.td

Index: llvm/include/llvm/Frontend/OpenMP/OMP.td
===================================================================
--- llvm/include/llvm/Frontend/OpenMP/OMP.td
+++ llvm/include/llvm/Frontend/OpenMP/OMP.td
@@ -922,6 +922,13 @@
     VersionedClause<OMPC_DistSchedule>
   ];
 }
+def OMP_BeginDeclareTarget : Directive<"begin declare target"> {
+  let allowedClauses = [
+    VersionedClause<OMPC_To>,
+    VersionedClause<OMPC_Link>,
+    VersionedClause<OMPC_DeviceType>,
+  ];
+}
 def OMP_DeclareTarget : Directive<"declare target"> {
   let allowedClauses = [
     VersionedClause<OMPC_To>,
Index: clang/test/OpenMP/nvptx_declare_variant_name_mangling.cpp
===================================================================
--- clang/test/OpenMP/nvptx_declare_variant_name_mangling.cpp
+++ clang/test/OpenMP/nvptx_declare_variant_name_mangling.cpp
@@ -6,8 +6,8 @@
 
 // CHECK-DAG: @_Z3barv
 // CHECK-DAG: @_Z3bazv
-// CHECK-DAG: @"_Z53bar$ompvariant$S2$s7$Pnvptx$Pnvptx64$S3$s9$Pmatch_anyv"
-// CHECK-DAG: @"_Z53baz$ompvariant$S2$s7$Pnvptx$Pnvptx64$S3$s9$Pmatch_anyv"
+// CHECK-DAG: define{{.*}}@"_Z53bar$ompvariant$S2$s7$Pnvptx$Pnvptx64$S3$s9$Pmatch_anyv"
+// CHECK-DAG: define{{.*}}@"_Z53baz$ompvariant$S2$s7$Pnvptx$Pnvptx64$S3$s9$Pmatch_anyv"
 // CHECK-DAG: call i32 @"_Z53bar$ompvariant$S2$s7$Pnvptx$Pnvptx64$S3$s9$Pmatch_anyv"()
 // CHECK-DAG: call i32 @"_Z53baz$ompvariant$S2$s7$Pnvptx$Pnvptx64$S3$s9$Pmatch_anyv"()
 
Index: clang/test/OpenMP/nvptx_declare_target_var_ctor_dtor_codegen.cpp
===================================================================
--- clang/test/OpenMP/nvptx_declare_target_var_ctor_dtor_codegen.cpp
+++ clang/test/OpenMP/nvptx_declare_target_var_ctor_dtor_codegen.cpp
@@ -34,21 +34,16 @@
 #pragma omp declare target (bar)
 int caz() { return 0; }
 
-// DEVICE-DAG: define{{ hidden | }}i32 [[FOO:@.*foo.*]]()
 // DEVICE-DAG: define{{ hidden | }}i32 [[BAR:@.*bar.*]]()
-// DEVICE-DAG: define{{ hidden | }}i32 [[BAZ:@.*baz.*]]()
-// DEVICE-DAG: define{{ hidden | }}i32 [[DOO:@.*doo.*]]()
-// DEVICE-DAG: define{{ hidden | }}i32 [[CAR:@.*car.*]]()
-// DEVICE-DAG: define{{ hidden | }}i32 [[CAZ:@.*caz.*]]()
 
 static int c = foo() + bar() + baz();
 #pragma omp declare target (c)
-// HOST-DAG: @[[C_CTOR:__omp_offloading__.+_c_l44_ctor]] = private constant i8 0
-// DEVICE-DAG: define internal void [[C_CTOR:@__omp_offloading__.+_c_l44_ctor]]()
-// DEVICE-DAG: call i32 [[FOO]]()
-// DEVICE-DAG: call i32 [[BAR]]()
-// DEVICE-DAG: call i32 [[BAZ]]()
-// DEVICE-DAG: ret void
+// HOST-DAG: @[[C_CTOR:__omp_offloading__.+_c_l39_ctor]] = private constant i8 0
+
+// DEVICE-DAG: define internal void [[C_CTOR:@__omp_offloading__.+_c_l39_ctor]]()
+// DEVICE-DAG: define{{ hidden | }}i32 [[FOO:@.*foo.*]]()
+// DEVICE-DAG: define{{ hidden | }}i32 [[BAZ:@.*baz.*]]()
+// DEVICE-DAG: define{{ hidden | }}i32 [[DOO:@.*doo.*]]()
 
 struct S {
   int a;
@@ -60,17 +55,14 @@
 #pragma omp declare target
 S cd = doo() + car() + caz() + baz();
 #pragma omp end declare target
-// HOST-DAG: @[[CD_CTOR:__omp_offloading__.+_cd_l61_ctor]] = private constant i8 0
-// DEVICE-DAG: define internal void [[CD_CTOR:@__omp_offloading__.+_cd_l61_ctor]]()
-// DEVICE-DAG: call i32 [[DOO]]()
-// DEVICE-DAG: call i32 [[CAR]]()
-// DEVICE-DAG: call i32 [[CAZ]]()
-// DEVICE-DAG: ret void
-
-// HOST-DAG: @[[CD_DTOR:__omp_offloading__.+_cd_l61_dtor]] = private constant i8 0
-// DEVICE-DAG: define internal void [[CD_DTOR:@__omp_offloading__.+_cd_l61_dtor]]()
-// DEVICE-DAG: call void
-// DEVICE-DAG: ret void
+// HOST-DAG: @[[CD_CTOR:__omp_offloading__.+_cd_l56_ctor]] = private constant i8 0
+// DEVICE-DAG: define internal void [[CD_CTOR:@__omp_offloading__.+_cd_l56_ctor]]()
+
+// DEVICE-DAG: define{{ hidden | }}i32 [[CAR:@.*car.*]]()
+// DEVICE-DAG: define{{ hidden | }}i32 [[CAZ:@.*caz.*]]()
+
+// HOST-DAG: @[[CD_DTOR:__omp_offloading__.+_cd_l56_dtor]] = private constant i8 0
+// DEVICE-DAG: define internal void [[CD_DTOR:@__omp_offloading__.+_cd_l56_dtor]]()
 
 // 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
@@ -91,13 +83,13 @@
   return 0;
 }
 
-// DEVICE: define weak{{.*}} void @__omp_offloading_{{.*}}_{{.*}}maini1{{.*}}_l[[@LINE-7]](i32* nonnull align {{[0-9]+}} dereferenceable{{[^,]*}}
-// DEVICE: [[C:%.+]] = load i32, i32* [[C_ADDR]],
-// DEVICE: store i32 [[C]], i32* %
+// DEVICE-DAG: define weak{{.*}} void @__omp_offloading_{{.*}}_{{.*}}maini1{{.*}}_l[[@LINE-7]](i32* nonnull align {{[0-9]+}} dereferenceable{{[^,]*}}
+// DEVICE-DAG: [[C:%.+]] = load i32, i32* [[C_ADDR]],
+// DEVICE-DAG: store i32 [[C]], i32* %
 
-// HOST: define internal void @__omp_offloading_{{.*}}_{{.*}}maini1{{.*}}_l[[@LINE-11]](i32* nonnull align {{[0-9]+}} dereferenceable{{.*}})
-// HOST: [[C:%.*]] = load i32, i32* @[[C_ADDR]],
-// HOST: store i32 [[C]], i32* %
+// HOST-DAG: define internal void @__omp_offloading_{{.*}}_{{.*}}maini1{{.*}}_l[[@LINE-11]](i32* nonnull align {{[0-9]+}} dereferenceable{{.*}})
+// HOST-DAG: [[C:%.*]] = load i32, i32* @[[C_ADDR]],
+// HOST-DAG: store i32 [[C]], i32* %
 
 // HOST-DAG: !{i32 1, !"[[CD_ADDR]]", i32 0, i32 {{[0-9]+}}}
 // HOST-DAG: !{i32 1, !"[[C_ADDR]]", i32 0, i32 {{[0-9]+}}}
Index: clang/test/OpenMP/nvptx_allocate_codegen.cpp
===================================================================
--- clang/test/OpenMP/nvptx_allocate_codegen.cpp
+++ clang/test/OpenMP/nvptx_allocate_codegen.cpp
@@ -17,6 +17,35 @@
 extern const omp_allocator_handle_t omp_cgroup_mem_alloc;
 extern const omp_allocator_handle_t omp_pteam_mem_alloc;
 extern const omp_allocator_handle_t omp_thread_mem_alloc;
+#pragma omp end declare target
+
+// Make sure EXT1-3 are `external` and have address space 4 even though they
+// might have been materialized before we encountered the allocate directive.
+#pragma omp declare target
+extern int EXT1;
+int *Use1 = &EXT1;
+#pragma omp end declare target
+// allocate after the end declare target
+#pragma omp allocate(EXT1) allocator(omp_const_mem_alloc)
+// CHECK-DAG: @EXT1 = external addrspace(4) {{.*}}global i32
+// CHECK-DAG: @Use1 = {{.*}}global
+
+extern int EXT2;
+#pragma omp declare target(EXT2)
+int *Use2 = &EXT2;
+#pragma omp declare target(Use2)
+// allocate after the declare target
+#pragma omp allocate(EXT2) allocator(omp_const_mem_alloc)
+// CHECK-DAG: @EXT2 = external addrspace(4) {{.*}}global i32
+// CHECK-DAG: @Use2 = {{.*}}global
+
+#pragma omp declare target
+extern int EXT3;
+int *Use3 = &EXT3;
+// allocate part of the declare target
+#pragma omp allocate(EXT3) allocator(omp_const_mem_alloc)
+// CHECK-DAG: @EXT3 = external addrspace(4) {{.*}}global i32
+// CHECK-DAG: @Use3 = {{.*}}global
 
 struct St{
  int a;
@@ -81,7 +110,19 @@
   }
 }
 
-#pragma omp end declare target
+int LateAllocateDecl1;
+#pragma omp declare target
+
+int LateAllocateDecl2;
+#pragma omp declare target to(LateAllocateDecl2)
+
+int LateAllocateDecl3;
+#pragma omp declare target(LateAllocateDecl3)
+
+#pragma omp allocate(LateAllocateDecl1) allocator(omp_const_mem_alloc)
+#pragma omp allocate(LateAllocateDecl2) allocator(omp_const_mem_alloc)
+#pragma omp allocate(LateAllocateDecl3) allocator(omp_const_mem_alloc)
+
 #endif
 // CHECK-LABEL: define {{[^@]+}}@main
 // CHECK-SAME: () #[[ATTR0:[0-9]+]] {
Index: clang/test/OpenMP/declare_target_only_one_side_compilation.cpp
===================================================================
--- /dev/null
+++ clang/test/OpenMP/declare_target_only_one_side_compilation.cpp
@@ -0,0 +1,75 @@
+// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple powerpc64le-unknown-unknown -fopenmp-targets=powerpc64le-ibm-linux-gnu -emit-llvm %s -o - | FileCheck %s --check-prefix HOST
+// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple powerpc64le-unknown-unknown -fopenmp-targets=powerpc64le-ibm-linux-gnu -emit-llvm-bc %s -o %t-ppc-host.bc
+// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple powerpc64le-unknown-unknown -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o - | FileCheck %s --check-prefix DEVICE
+
+// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple i386-pc-linux-gnu -fopenmp-targets=i386-pc-linux-gnu -emit-llvm %s -o - | FileCheck %s --check-prefix HOST
+// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple i386-pc-linux-gnu -fopenmp-targets=i386-pc-linux-gnu -emit-llvm-bc %s -o %t-i386-host.bc
+// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple i386-pc-linux-gnu -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-i386-host.bc -o - | FileCheck %s --check-prefix DEVICE
+
+// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple x86_64-unknown-linux-gnu -fopenmp-targets=x86_64-unknown-linux-gnu -emit-llvm %s -o - | FileCheck %s --check-prefix HOST
+// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple x86_64-unknown-linux-gnu -fopenmp-targets=x86_64-unknown-linux-gnu -emit-llvm-bc %s -o %t-x86_64-host.bc
+// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple x86_64-unknown-linux-gnu -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-x86_64-host.bc -o - | FileCheck %s --check-prefix DEVICE
+
+// expected-no-diagnostics
+
+#pragma omp declare target
+#pragma omp begin declare variant match(device = {kind(nohost)})
+int G1;
+static int G2;
+#pragma omp end declare variant
+#pragma omp end declare target
+
+#pragma omp begin declare target device_type(nohost)
+int G3;
+static int G4;
+#pragma omp end declare target
+
+#pragma omp declare target
+int G5;
+static int G6;
+#pragma omp end declare target
+
+#pragma omp declare target to(G5, G6) device_type(nohost)
+
+#pragma omp begin declare target device_type(host)
+int G7;
+static int G8;
+#pragma omp end declare target
+
+#pragma omp declare target
+int G9;
+static int G10;
+#pragma omp end declare target
+
+int G11;
+static int G12;
+#pragma omp declare target to(G9, G10, G11, G12) device_type(host)
+
+// TODO: The code below should probably work but it is not 100% clear.
+#if 0
+#pragma omp declare target
+#pragma omp begin declare variant match(device = {kind(host)})
+int GX;
+static int GY;
+#pragma omp end declare variant
+#pragma omp end declare target
+#endif
+
+// TODO: It is odd, probably wrong, that we don't mangle all variables.
+
+// DEVICE-DAG: @G1 = hidden {{.*}}global i32 0, align 4
+// DEVICE-DAG: @_ZL2G2 = internal {{.*}}global i32 0, align 4
+// DEVICE-DAG: @G3 = hidden {{.*}}global i32 0, align 4
+// DEVICE-DAG: @_ZL2G4 = internal {{.*}}global i32 0, align 4
+// DEVICE-DAG: @G5 = hidden {{.*}}global i32 0, align 4
+// DEVICE-DAG: @_ZL2G6 = internal {{.*}}global i32 0, align 4
+// DEVICE-NOT: ref
+// DEVICE-NOT: llvm.used
+// DEVICE-NOT: omp_offload
+
+// HOST-DAG: @G7 = dso_local global i32 0, align 4
+// HOST-DAG: @_ZL2G8 = internal global i32 0, align 4
+// HOST-DAG: @G9 = dso_local global i32 0, align 4
+// HOST-DAG: @_ZL3G10 = internal global i32 0, align 4
+// HOST-DAG: @G11 = dso_local global i32 0, align 4
+// HOST-DAG: @_ZL3G12 = internal global i32 0, align 4
Index: clang/test/OpenMP/declare_target_messages.cpp
===================================================================
--- clang/test/OpenMP/declare_target_messages.cpp
+++ clang/test/OpenMP/declare_target_messages.cpp
@@ -17,13 +17,16 @@
 void f();
 #pragma omp end declare target shared(a) // expected-warning {{extra tokens at the end of '#pragma omp end declare target' are ignored}}
 
-#pragma omp declare target map(a) // omp45-error {{unexpected 'map' clause, only 'to' or 'link' clauses expected}} omp5-error {{unexpected 'map' clause, only 'to', 'link' or 'device_type' clauses expected}}
+#pragma omp declare target map(a) // expected-error {{expected at least one 'to' or 'link' clause}} omp45-error {{unexpected 'map' clause, only 'to' or 'link' clauses expected}} omp5-error {{unexpected 'map' clause, only 'to', 'link' or 'device_type' clauses expected}}
 
 #pragma omp declare target to(foo1) // expected-error {{use of undeclared identifier 'foo1'}}
 
 #pragma omp declare target link(foo2) // expected-error {{use of undeclared identifier 'foo2'}}
 
-#pragma omp declare target to(f) device_type(any) device_type(any) device_type(host) // omp45-error {{unexpected 'device_type' clause, only 'to' or 'link' clauses expected}} omp5-warning 2 {{more than one 'device_type' clause is specified}} omp5-error {{'device_type(host)' does not match previously specified 'device_type(any)' for the same declaration}}
+#pragma omp declare target to(f) device_type(host) // omp45-error {{unexpected 'device_type' clause, only 'to' or 'link' clauses expected}} dev5-note {{marked as 'device_type(host)' here}}
+
+void q();
+#pragma omp declare target to(q) device_type(any) device_type(any) device_type(host) // omp45-error {{unexpected 'device_type' clause, only 'to' or 'link' clauses expected}} omp5-warning {{more than one 'device_type' clause is specified}}
 
 void c();
 
@@ -118,7 +121,8 @@
   g = object.method();
   g += object.method1();
   g += object1.method() + p;
-  f();
+  f(); // dev5-error {{function with 'device_type(host)' is not available on device}}
+  q();
   c();
 }
 #pragma omp declare target
@@ -150,10 +154,10 @@
 }
 
 namespace {
-#pragma omp declare target // expected-note {{to match this '#pragma omp declare target'}}
-  int x;
-} //  expected-error {{expected '#pragma omp end declare target'}}
-#pragma omp end declare target // expected-error {{unexpected OpenMP directive '#pragma omp end declare target'}}
+#pragma omp declare target
+int x;
+} // namespace
+#pragma omp end declare target
 
 #pragma omp declare target link(S) // expected-error {{'S' used in declare target directive is not a variable or a function name}}
 
@@ -187,4 +191,10 @@
 void any7() {device();} // host5-error {{function with 'device_type(nohost)' is not available on host}}
 void any8() {any2();}
 
-#pragma omp declare target // expected-error {{expected '#pragma omp end declare target'}} expected-note {{to match this '#pragma omp declare target'}}
+int MultiDevTy;
+#pragma omp declare target to(MultiDevTy) device_type(any)    // omp45-error {{unexpected 'device_type' clause, only 'to' or 'link' clauses expected}}
+#pragma omp declare target to(MultiDevTy) device_type(host)   // omp45-error {{unexpected 'device_type' clause, only 'to' or 'link' clauses expected}} omp5-error {{'device_type(host)' does not match previously specified 'device_type(any)' for the same declaration}}
+#pragma omp declare target to(MultiDevTy) device_type(nohost) // omp45-error {{unexpected 'device_type' clause, only 'to' or 'link' clauses expected}} omp5-error {{'device_type(nohost)' does not match previously specified 'device_type(any)' for the same declaration}}
+
+// TODO: Issue an error message error {{expected '#pragma omp end declare target'}} note {{to match this '#pragma omp declare target'}}
+#pragma omp declare target
Index: clang/test/OpenMP/declare_target_device_only_compilation.cpp
===================================================================
--- clang/test/OpenMP/declare_target_device_only_compilation.cpp
+++ /dev/null
@@ -1,20 +0,0 @@
-// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple powerpc64le-unknown-unknown -fopenmp-targets=powerpc64le-ibm-linux-gnu -emit-llvm-bc %s -o %t-ppc-host.bc
-// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple powerpc64le-unknown-unknown -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-ppc-host.bc -o - | FileCheck %s
-
-// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple i386-pc-linux-gnu -fopenmp-targets=i386-pc-linux-gnu -emit-llvm-bc %s -o %t-i386-host.bc
-// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple i386-pc-linux-gnu -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-i386-host.bc -o - | FileCheck %s
-
-// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple x86_64-unknown-linux-gnu -fopenmp-targets=x86_64-unknown-linux-gnu -emit-llvm-bc %s -o %t-x86_64-host.bc
-// RUN: %clang_cc1 -verify -fopenmp -x c++ -triple x86_64-unknown-linux-gnu -emit-llvm %s -fopenmp-is-device -fopenmp-host-ir-file-path %t-x86_64-host.bc -o - | FileCheck %s
-
-// expected-no-diagnostics
-
-#pragma omp declare target
-#pragma omp begin declare variant match(device={kind(nohost)})
-int G1;
-#pragma omp end declare variant
-#pragma omp end declare target
-
-// CHECK: @[[G:.+]] = hidden {{.*}}global i32 0, align 4
-// CHECK: !omp_offload.info = !{!0}
-// CHECK: !0 = !{i32 1, !"[[G]]", i32 0, i32 0}
Index: clang/test/OpenMP/declare_target_codegen_globalization.cpp
===================================================================
--- clang/test/OpenMP/declare_target_codegen_globalization.cpp
+++ clang/test/OpenMP/declare_target_codegen_globalization.cpp
@@ -37,11 +37,13 @@
 // CHECK: define {{.*}}[[BAR]]()
 // CHECK: alloca i32,
 // CHECK: [[A_LOCAL_ADDR:%.+]] = alloca i32,
+// CHECK: [[IS_IN_PAR:%.+]] = icmp eq i16 {{.*}}, 0
 // CHECK: [[RES:%.+]] = call i8 @__kmpc_is_spmd_exec_mode()
 // CHECK: [[IS_SPMD:%.+]] = icmp ne i8 [[RES]], 0
 // CHECK: br i1 [[IS_SPMD]], label
 // CHECK: br label
-// CHECK: [[RES:%.+]] = call i8* @__kmpc_data_sharing_coalesced_push_stack(i64 128, i16 0)
+// CHECK: [[STACK_SIZE:%.+]] = select i1 [[IS_IN_PAR]], i64 4, i64 128
+// CHECK: [[RES:%.+]] = call i8* @__kmpc_data_sharing_coalesced_push_stack(i64 [[STACK_SIZE]], i16 0)
 // CHECK: [[GLOBALS:%.+]] = bitcast i8* [[RES]] to [[GLOBAL_ST:%.+]]*
 // CHECK: br label
 // CHECK: [[ITEMS:%.+]] = phi [[GLOBAL_ST]]* [ null, {{.+}} ], [ [[GLOBALS]], {{.+}} ]
@@ -49,7 +51,9 @@
 // CHECK: [[TID:%.+]] = call i32 @llvm.nvvm.read.ptx.sreg.tid.x()
 // CHECK: [[LID:%.+]] = and i32 [[TID]], 31
 // CHECK: [[A_GLOBAL_ADDR:%.+]] = getelementptr inbounds [32 x i32], [32 x i32]* [[A_ADDR]], i32 0, i32 [[LID]]
-// CHECK: [[A_ADDR:%.+]] = select i1 [[IS_SPMD]], i32* [[A_LOCAL_ADDR]], i32* [[A_GLOBAL_ADDR]]
+// CHECK: [[A_GLOBAL_ADDR_SINGLE:%.+]] = getelementptr inbounds %struct._globalized_locals_ty.0, %struct._globalized_locals_ty.0* %{{.*}}, i32 0, i32 0
+// CHECK: [[A_GLOBAL_ADDR_SEL:%.+]] = select i1 [[IS_IN_PAR]], i32* [[A_GLOBAL_ADDR_SINGLE]], i32* [[A_GLOBAL_ADDR]]
+// CHECK: [[A_ADDR:%.+]] = select i1 [[IS_SPMD]], i32* [[A_LOCAL_ADDR]], i32* [[A_GLOBAL_ADDR_SEL]]
 // CHECK: call {{.*}}[[FOO]](i32* nonnull align {{[0-9]+}} dereferenceable{{.*}} [[A_ADDR]])
 // CHECK: br i1 [[IS_SPMD]], label
 // CHECK: [[BC:%.+]] = bitcast [[GLOBAL_ST]]* [[ITEMS]] to i8*
Index: clang/test/OpenMP/declare_target_codegen.cpp
===================================================================
--- clang/test/OpenMP/declare_target_codegen.cpp
+++ clang/test/OpenMP/declare_target_codegen.cpp
@@ -40,7 +40,6 @@
 // CHECK-DAG: @pair = {{.*}}addrspace(3) global %struct.PAIR undef
 // CHECK-DAG: @b ={{ hidden | }}global i32 15,
 // CHECK-DAG: @d ={{ hidden | }}global i32 0,
-// CHECK-DAG: @c = external global i32,
 // CHECK-DAG: @globals ={{ hidden | }}global %struct.S zeroinitializer,
 // CHECK-DAG: [[STAT:@.+stat]] = internal global %struct.S zeroinitializer,
 // CHECK-DAG: [[STAT_REF:@.+]] = internal constant %struct.S* [[STAT]]
@@ -252,17 +251,41 @@
 // CHECK-DAG: !{{{.+}}virtual_foo
 
 #ifdef OMP5
-void host_fun() {}
-#pragma omp declare target to(host_fun) device_type(host)
-void device_fun() {}
-#pragma omp declare target to(device_fun) device_type(nohost)
-// HOST5-NOT: define {{.*}}void {{.*}}device_fun{{.*}}
-// HOST5: define {{.*}}void {{.*}}host_fun{{.*}}
-// HOST5-NOT: define {{.*}}void {{.*}}device_fun{{.*}}
-
-// DEV5-NOT: define {{.*}}void {{.*}}host_fun{{.*}}
-// DEV5: define {{.*}}void {{.*}}device_fun{{.*}}
-// DEV5-NOT: define {{.*}}void {{.*}}host_fun{{.*}}
+void host_fun1() {}
+#pragma omp declare target to(host_fun1) device_type(host)
+void device_fun1() {}
+#pragma omp declare target to(device_fun1) device_type(nohost)
+// HOST5-NOT: define {{.*}}void {{.*}}device_fun1{{.*}}
+// HOST5: define {{.*}}void {{.*}}host_fun1{{.*}}
+// HOST5-NOT: define {{.*}}void {{.*}}device_fun1{{.*}}
+
+// DEV5-NOT: define {{.*}}void {{.*}}host_fun1{{.*}}
+// DEV5: define {{.*}}void {{.*}}device_fun1{{.*}}
+// DEV5-NOT: define {{.*}}void {{.*}}host_fun1{{.*}}
+
+// Implicit declaration with the "wrong" device type first,
+// explicit declaration afterwards.
+#pragma omp begin declare target device_type(nohost)
+void host_fun2() {}
+#pragma omp end declare target
+#pragma omp begin declare target device_type(host)
+void device_fun2() {}
+#pragma omp end declare target
+
+// TODO: According to OpenMP 5.1 this is an OK use, arguably this
+//       is not really useful and makes it hard/costly to implement.
+//       We should remove the non-begin/end forms in OpenMP 6.0.
+#pragma omp declare target to(host_fun2) device_type(host)
+#pragma omp declare target to(device_fun2) device_type(nohost)
+
+// HOST5-NOT: define {{.*}}void {{.*}}device_fun2{{.*}}
+// HOST5: define {{.*}}void {{.*}}host_fun2{{.*}}
+// HOST5-NOT: define {{.*}}void {{.*}}device_fun2{{.*}}
+
+// DEV5-NOT: define {{.*}}void {{.*}}host_fun2{{.*}}
+// DEV5: define {{.*}}void {{.*}}device_fun2{{.*}}
+// DEV5-NOT: define {{.*}}void {{.*}}host_fun2{{.*}}
+
 #endif // OMP5
 
 struct PAIR {
Index: clang/test/OpenMP/allocate_codegen.cpp
===================================================================
--- clang/test/OpenMP/allocate_codegen.cpp
+++ clang/test/OpenMP/allocate_codegen.cpp
@@ -30,6 +30,14 @@
   KMP_ALLOCATOR_MAX_HANDLE = __UINTPTR_MAX__
 };
 
+// Make sure EXT is `external` even though it was probably
+// materialized before we encountered the allocate directive.
+// CHECK-DAG: @Use = {{.*}}global i32* @EXT
+// CHECK-DAG: @EXT = external {{.*}}global i32
+extern int EXT;
+int *Use = &EXT;
+#pragma omp allocate(EXT) allocator(omp_const_mem_alloc)
+
 struct St{
  int a;
 };
Index: clang/lib/Sema/SemaOpenMP.cpp
===================================================================
--- clang/lib/Sema/SemaOpenMP.cpp
+++ clang/lib/Sema/SemaOpenMP.cpp
@@ -2481,8 +2481,8 @@
   Optional<OMPDeclareTargetDeclAttr::DevTypeTy> DevTy =
       OMPDeclareTargetDeclAttr::getDeviceType(Caller->getMostRecentDecl());
   // Ignore host functions during device analyzis.
-  if (LangOpts.OpenMPIsDevice && DevTy &&
-      *DevTy == OMPDeclareTargetDeclAttr::DT_Host)
+  if (LangOpts.OpenMPIsDevice &&
+      (!DevTy || *DevTy == OMPDeclareTargetDeclAttr::DT_Host))
     return;
   // Ignore nohost functions during host analyzis.
   if (!LangOpts.OpenMPIsDevice && DevTy &&
@@ -19972,7 +19972,8 @@
       OMPDefaultmapClause(StartLoc, LParenLoc, MLoc, KindLoc, EndLoc, Kind, M);
 }
 
-bool Sema::ActOnStartOpenMPDeclareTargetDirective(SourceLocation Loc) {
+bool Sema::ActOnStartOpenMPDeclareTargetContext(
+    DeclareTargetContextInfo &DTCI) {
   DeclContext *CurLexicalContext = getCurLexicalContext();
   if (!CurLexicalContext->isFileContext() &&
       !CurLexicalContext->isExternCContext() &&
@@ -19981,23 +19982,30 @@
       !isa<ClassTemplateDecl>(CurLexicalContext) &&
       !isa<ClassTemplatePartialSpecializationDecl>(CurLexicalContext) &&
       !isa<ClassTemplateSpecializationDecl>(CurLexicalContext)) {
-    Diag(Loc, diag::err_omp_region_not_file_context);
+    Diag(DTCI.Loc, diag::err_omp_region_not_file_context);
     return false;
   }
-  DeclareTargetNesting.push_back(Loc);
+  DeclareTargetNesting.push_back(DTCI);
   return true;
 }
 
-void Sema::ActOnFinishOpenMPDeclareTargetDirective() {
+const Sema::DeclareTargetContextInfo
+Sema::ActOnOpenMPEndDeclareTargetDirective() {
   assert(!DeclareTargetNesting.empty() &&
-         "Unexpected ActOnFinishOpenMPDeclareTargetDirective");
-  DeclareTargetNesting.pop_back();
+         "check isInOpenMPDeclareTargetContext() first!");
+  return DeclareTargetNesting.pop_back_val();
+}
+
+void Sema::ActOnFinishedOpenMPDeclareTargetContext(
+    DeclareTargetContextInfo &DTCI) {
+  for (auto &It : DTCI.ExplicitlyMapped)
+    ActOnOpenMPDeclareTargetName(It.first, It.second.Loc, It.second.MT,
+                                 DTCI.DT);
 }
 
-NamedDecl *
-Sema::lookupOpenMPDeclareTargetName(Scope *CurScope, CXXScopeSpec &ScopeSpec,
-                                    const DeclarationNameInfo &Id,
-                                    NamedDeclSetType &SameDirectiveDecls) {
+NamedDecl *Sema::lookupOpenMPDeclareTargetName(Scope *CurScope,
+                                               CXXScopeSpec &ScopeSpec,
+                                               const DeclarationNameInfo &Id) {
   LookupResult Lookup(*this, Id, LookupOrdinaryName);
   LookupParsedName(Lookup, CurScope, &ScopeSpec, true);
 
@@ -20026,8 +20034,6 @@
     Diag(Id.getLoc(), diag::err_omp_invalid_target_decl) << Id.getName();
     return nullptr;
   }
-  if (!SameDirectiveDecls.insert(cast<NamedDecl>(ND->getCanonicalDecl())))
-    Diag(Id.getLoc(), diag::err_omp_declare_target_multiple) << Id.getName();
   return ND;
 }
 
@@ -20044,32 +20050,35 @@
       (ND->isUsed(/*CheckUsedAttr=*/false) || ND->isReferenced()))
     Diag(Loc, diag::warn_omp_declare_target_after_first_use);
 
+  // Explicit declare target lists have precedence.
+  const unsigned Level = -1;
+
   auto *VD = cast<ValueDecl>(ND);
-  Optional<OMPDeclareTargetDeclAttr::DevTypeTy> DevTy =
-      OMPDeclareTargetDeclAttr::getDeviceType(VD);
-  Optional<SourceLocation> AttrLoc = OMPDeclareTargetDeclAttr::getLocation(VD);
-  if (DevTy.hasValue() && *DevTy != DT &&
-      (DeclareTargetNesting.empty() ||
-       *AttrLoc != DeclareTargetNesting.back())) {
+  llvm::Optional<OMPDeclareTargetDeclAttr *> ActiveAttr =
+      OMPDeclareTargetDeclAttr::getActiveAttr(VD);
+  if (ActiveAttr.hasValue() && ActiveAttr.getValue()->getDevType() != DT &&
+      ActiveAttr.getValue()->getLevel() == Level) {
     Diag(Loc, diag::err_omp_device_type_mismatch)
         << OMPDeclareTargetDeclAttr::ConvertDevTypeTyToStr(DT)
-        << OMPDeclareTargetDeclAttr::ConvertDevTypeTyToStr(*DevTy);
+        << OMPDeclareTargetDeclAttr::ConvertDevTypeTyToStr(
+               ActiveAttr.getValue()->getDevType());
     return;
   }
-  Optional<OMPDeclareTargetDeclAttr::MapTypeTy> Res =
-      OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD);
-  if (!Res || (!DeclareTargetNesting.empty() &&
-               *AttrLoc == DeclareTargetNesting.back())) {
-    auto *A = OMPDeclareTargetDeclAttr::CreateImplicit(
-        Context, MT, DT, DeclareTargetNesting.size() + 1,
-        SourceRange(Loc, Loc));
-    ND->addAttr(A);
-    if (ASTMutationListener *ML = Context.getASTMutationListener())
-      ML->DeclarationMarkedOpenMPDeclareTarget(ND, A);
-    checkDeclIsAllowedInOpenMPTarget(nullptr, ND, Loc);
-  } else if (*Res != MT) {
+  if (ActiveAttr.hasValue() && ActiveAttr.getValue()->getMapType() != MT &&
+      ActiveAttr.getValue()->getLevel() == Level) {
     Diag(Loc, diag::err_omp_declare_target_to_and_link) << ND;
+    return;
   }
+
+  if (ActiveAttr.hasValue() && ActiveAttr.getValue()->getLevel() == Level)
+    return;
+
+  auto *A = OMPDeclareTargetDeclAttr::CreateImplicit(Context, MT, DT, Level,
+                                                     SourceRange(Loc, Loc));
+  ND->addAttr(A);
+  if (ASTMutationListener *ML = Context.getASTMutationListener())
+    ML->DeclarationMarkedOpenMPDeclareTarget(ND, A);
+  checkDeclIsAllowedInOpenMPTarget(nullptr, ND, Loc);
 }
 
 static void checkDeclInTargetContext(SourceLocation SL, SourceRange SR,
@@ -20083,8 +20092,6 @@
       (SemaRef.getCurLambda(/*IgnoreNonLambdaCapturingScope=*/true) ||
        SemaRef.getCurBlock() || SemaRef.getCurCapturedRegion()) &&
       VD->hasGlobalStorage()) {
-    llvm::Optional<OMPDeclareTargetDeclAttr::MapTypeTy> MapTy =
-        OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD);
     if (!MapTy || *MapTy != OMPDeclareTargetDeclAttr::MT_To) {
       // OpenMP 5.0, 2.12.7 declare target Directive, Restrictions
       // If a lambda declaration and definition appears between a
@@ -20148,15 +20155,19 @@
     if ((E || !VD->getType()->isIncompleteType()) &&
         !checkValueDeclInTarget(SL, SR, *this, DSAStack, VD))
       return;
-    if (!E && !OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD)) {
+    if (!E && isInOpenMPDeclareTargetContext()) {
       // Checking declaration inside declare target region.
       if (isa<VarDecl>(D) || isa<FunctionDecl>(D) ||
           isa<FunctionTemplateDecl>(D)) {
+        llvm::Optional<OMPDeclareTargetDeclAttr *> ActiveAttr =
+            OMPDeclareTargetDeclAttr::getActiveAttr(VD);
+        unsigned Level = DeclareTargetNesting.size();
+        if (ActiveAttr.hasValue() && ActiveAttr.getValue()->getLevel() >= Level)
+          return;
+        DeclareTargetContextInfo &DTCI = DeclareTargetNesting.back();
         auto *A = OMPDeclareTargetDeclAttr::CreateImplicit(
-            Context, OMPDeclareTargetDeclAttr::MT_To,
-            OMPDeclareTargetDeclAttr::DT_Any, DeclareTargetNesting.size(),
-            SourceRange(DeclareTargetNesting.back(),
-                        DeclareTargetNesting.back()));
+            Context, OMPDeclareTargetDeclAttr::MT_To, DTCI.DT, Level,
+            SourceRange(DTCI.Loc, DTCI.Loc));
         D->addAttr(A);
         if (ASTMutationListener *ML = Context.getASTMutationListener())
           ML->DeclarationMarkedOpenMPDeclareTarget(D, A);
Index: clang/lib/Sema/SemaDecl.cpp
===================================================================
--- clang/lib/Sema/SemaDecl.cpp
+++ clang/lib/Sema/SemaDecl.cpp
@@ -18436,7 +18436,7 @@
         OMPDeclareTargetDeclAttr::getDeviceType(FD->getCanonicalDecl());
     // DevTy may be changed later by
     //  #pragma omp declare target to(*) device_type(*).
-    // Therefore DevTyhaving no value does not imply host. The emission status
+    // Therefore DevTy having no value does not imply host. The emission status
     // will be checked again at the end of compilation unit with Final = true.
     if (DevTy.hasValue())
       if (*DevTy == OMPDeclareTargetDeclAttr::DT_Host)
Index: clang/lib/Parse/ParseOpenMP.cpp
===================================================================
--- clang/lib/Parse/ParseOpenMP.cpp
+++ clang/lib/Parse/ParseOpenMP.cpp
@@ -131,6 +131,7 @@
       {OMPD_declare, OMPD_simd, OMPD_declare_simd},
       {OMPD_declare, OMPD_target, OMPD_declare_target},
       {OMPD_declare, OMPD_variant, OMPD_declare_variant},
+      {OMPD_begin_declare, OMPD_target, OMPD_begin_declare_target},
       {OMPD_begin_declare, OMPD_variant, OMPD_begin_declare_variant},
       {OMPD_end_declare, OMPD_variant, OMPD_end_declare_variant},
       {OMPD_distribute, OMPD_parallel, OMPD_distribute_parallel},
@@ -1664,30 +1665,41 @@
   return SimpleClauseData(Type, Loc, LOpen, TypeLoc, RLoc);
 }
 
-Parser::DeclGroupPtrTy Parser::ParseOMPDeclareTargetClauses() {
-  // OpenMP 4.5 syntax with list of entities.
-  Sema::NamedDeclSetType SameDirectiveDecls;
-  SmallVector<std::tuple<OMPDeclareTargetDeclAttr::MapTypeTy, SourceLocation,
-                         NamedDecl *>,
-              4>
-      DeclareTargetDecls;
-  OMPDeclareTargetDeclAttr::DevTypeTy DT = OMPDeclareTargetDeclAttr::DT_Any;
+void Parser::ParseOMPDeclareTargetClauses(
+    Sema::DeclareTargetContextInfo &DTCI) {
   SourceLocation DeviceTypeLoc;
+  bool RequiresToOrLinkClause = false;
+  bool HasToOrLinkClause = false;
   while (Tok.isNot(tok::annot_pragma_openmp_end)) {
     OMPDeclareTargetDeclAttr::MapTypeTy MT = OMPDeclareTargetDeclAttr::MT_To;
-    if (Tok.is(tok::identifier)) {
+    bool HasIdentifier = Tok.is(tok::identifier);
+    if (HasIdentifier) {
+      // If we see any clause we need a to or link clause.
+      RequiresToOrLinkClause = true;
       IdentifierInfo *II = Tok.getIdentifierInfo();
       StringRef ClauseName = II->getName();
       bool IsDeviceTypeClause =
           getLangOpts().OpenMP >= 50 &&
           getOpenMPClauseKind(ClauseName) == OMPC_device_type;
-      // Parse 'to|link|device_type' clauses.
-      if (!OMPDeclareTargetDeclAttr::ConvertStrToMapTypeTy(ClauseName, MT) &&
-          !IsDeviceTypeClause) {
+
+      bool IsToOrLinkClause =
+          OMPDeclareTargetDeclAttr::ConvertStrToMapTypeTy(ClauseName, MT);
+      assert((!IsDeviceTypeClause || !IsToOrLinkClause) && "Cannot be both!");
+
+      if (!IsDeviceTypeClause && DTCI.Kind == OMPD_begin_declare_target) {
         Diag(Tok, diag::err_omp_declare_target_unexpected_clause)
-            << ClauseName << (getLangOpts().OpenMP >= 50 ? 1 : 0);
+            << ClauseName << 0;
         break;
       }
+      if (!IsDeviceTypeClause && !IsToOrLinkClause) {
+        Diag(Tok, diag::err_omp_declare_target_unexpected_clause)
+            << ClauseName << (getLangOpts().OpenMP >= 50 ? 2 : 1);
+        break;
+      }
+
+      if (IsToOrLinkClause)
+        HasToOrLinkClause = true;
+
       // Parse 'device_type' clause and go to next clause if any.
       if (IsDeviceTypeClause) {
         Optional<SimpleClauseData> DevTypeData =
@@ -1697,16 +1709,17 @@
             // We already saw another device_type clause, diagnose it.
             Diag(DevTypeData.getValue().Loc,
                  diag::warn_omp_more_one_device_type_clause);
+            break;
           }
           switch (static_cast<OpenMPDeviceType>(DevTypeData.getValue().Type)) {
           case OMPC_DEVICE_TYPE_any:
-            DT = OMPDeclareTargetDeclAttr::DT_Any;
+            DTCI.DT = OMPDeclareTargetDeclAttr::DT_Any;
             break;
           case OMPC_DEVICE_TYPE_host:
-            DT = OMPDeclareTargetDeclAttr::DT_Host;
+            DTCI.DT = OMPDeclareTargetDeclAttr::DT_Host;
             break;
           case OMPC_DEVICE_TYPE_nohost:
-            DT = OMPDeclareTargetDeclAttr::DT_NoHost;
+            DTCI.DT = OMPDeclareTargetDeclAttr::DT_NoHost;
             break;
           case OMPC_DEVICE_TYPE_unknown:
             llvm_unreachable("Unexpected device_type");
@@ -1717,37 +1730,47 @@
       }
       ConsumeToken();
     }
-    auto &&Callback = [this, MT, &DeclareTargetDecls, &SameDirectiveDecls](
-                          CXXScopeSpec &SS, DeclarationNameInfo NameInfo) {
-      NamedDecl *ND = Actions.lookupOpenMPDeclareTargetName(
-          getCurScope(), SS, NameInfo, SameDirectiveDecls);
-      if (ND)
-        DeclareTargetDecls.emplace_back(MT, NameInfo.getLoc(), ND);
-    };
-    if (ParseOpenMPSimpleVarList(OMPD_declare_target, Callback,
-                                 /*AllowScopeSpecifier=*/true))
+
+    if (DTCI.Kind == OMPD_declare_target || HasIdentifier) {
+      auto &&Callback = [this, MT, &DTCI](CXXScopeSpec &SS,
+                                          DeclarationNameInfo NameInfo) {
+        NamedDecl *ND =
+            Actions.lookupOpenMPDeclareTargetName(getCurScope(), SS, NameInfo);
+        if (!ND)
+          return;
+        Sema::DeclareTargetContextInfo::MapInfo MI{MT, NameInfo.getLoc()};
+        bool FirstMapping = DTCI.ExplicitlyMapped.try_emplace(ND, MI).second;
+        if (!FirstMapping)
+          Diag(NameInfo.getLoc(), diag::err_omp_declare_target_multiple)
+              << NameInfo.getName();
+      };
+      if (ParseOpenMPSimpleVarList(OMPD_declare_target, Callback,
+                                   /*AllowScopeSpecifier=*/true))
+        break;
+    }
+
+    if (Tok.is(tok::l_paren)) {
+      Diag(Tok,
+           diag::err_omp_begin_declare_target_unexpected_implicit_to_clause);
+      break;
+    }
+    if (!HasIdentifier && Tok.isNot(tok::annot_pragma_openmp_end)) {
+      Diag(Tok,
+           diag::err_omp_declare_target_unexpected_clause_after_implicit_to);
       break;
+    }
 
     // Consume optional ','.
     if (Tok.is(tok::comma))
       ConsumeToken();
   }
+
+  // For declare target require at least 'to' or 'link' to be present.
+  if (DTCI.Kind == OMPD_declare_target && RequiresToOrLinkClause &&
+      !HasToOrLinkClause)
+    Diag(DTCI.Loc, diag::err_omp_declare_target_missing_to_or_link_clause);
+
   SkipUntil(tok::annot_pragma_openmp_end, StopBeforeMatch);
-  ConsumeAnyToken();
-  for (auto &MTLocDecl : DeclareTargetDecls) {
-    OMPDeclareTargetDeclAttr::MapTypeTy MT;
-    SourceLocation Loc;
-    NamedDecl *ND;
-    std::tie(MT, Loc, ND) = MTLocDecl;
-    // device_type clause is applied only to functions.
-    Actions.ActOnOpenMPDeclareTargetName(
-        ND, Loc, MT, isa<VarDecl>(ND) ? OMPDeclareTargetDeclAttr::DT_Any : DT);
-  }
-  SmallVector<Decl *, 4> Decls(SameDirectiveDecls.begin(),
-                               SameDirectiveDecls.end());
-  if (Decls.empty())
-    return DeclGroupPtrTy();
-  return Actions.BuildDeclaratorGroup(Decls);
 }
 
 void Parser::skipUntilPragmaOpenMPEnd(OpenMPDirectiveKind DKind) {
@@ -1784,10 +1807,11 @@
     SkipUntil(tok::annot_pragma_openmp_end, StopBeforeMatch);
 }
 
-void Parser::ParseOMPEndDeclareTargetDirective(OpenMPDirectiveKind DKind,
+void Parser::ParseOMPEndDeclareTargetDirective(OpenMPDirectiveKind BeginDKind,
+                                               OpenMPDirectiveKind EndDKind,
                                                SourceLocation DKLoc) {
-  parseOMPEndDirective(OMPD_declare_target, OMPD_end_declare_target, DKind,
-                       DKLoc, Tok.getLocation(),
+  parseOMPEndDirective(BeginDKind, OMPD_end_declare_target, EndDKind, DKLoc,
+                       Tok.getLocation(),
                        /* SkipUntilOpenMPEnd */ false);
   // Skip the last annot_pragma_openmp_end.
   if (Tok.is(tok::annot_pragma_openmp_end))
@@ -2101,53 +2125,41 @@
     ParseOMPDeclareVariantClauses(Ptr, Toks, Loc);
     return Ptr;
   }
+  case OMPD_begin_declare_target:
   case OMPD_declare_target: {
     SourceLocation DTLoc = ConsumeAnyToken();
-    if (Tok.isNot(tok::annot_pragma_openmp_end)) {
-      return ParseOMPDeclareTargetClauses();
-    }
+    bool HasClauses = Tok.isNot(tok::annot_pragma_openmp_end);
+    bool HasImplicitMappings =
+        DKind == OMPD_begin_declare_target || !HasClauses;
+    Sema::DeclareTargetContextInfo DTCI(DKind, DTLoc);
+    if (HasClauses)
+      ParseOMPDeclareTargetClauses(DTCI);
 
     // Skip the last annot_pragma_openmp_end.
     ConsumeAnyToken();
 
-    if (!Actions.ActOnStartOpenMPDeclareTargetDirective(DTLoc))
-      return DeclGroupPtrTy();
-
-    ParsingOpenMPDirectiveRAII NormalScope(*this, /*Value=*/false);
-    llvm::SmallVector<Decl *, 4> Decls;
-    while (Tok.isNot(tok::eof) && Tok.isNot(tok::r_brace)) {
-      if (Tok.isAnnotation() && Tok.is(tok::annot_pragma_openmp)) {
-        TentativeParsingAction TPA(*this);
-        ConsumeAnnotationToken();
-        DKind = parseOpenMPDirectiveKind(*this);
-        if (DKind != OMPD_end_declare_target)
-          TPA.Revert();
-        else
-          TPA.Commit();
-      }
-      if (DKind == OMPD_end_declare_target)
-        break;
-      DeclGroupPtrTy Ptr;
-      // Here we expect to see some function declaration.
-      if (AS == AS_none) {
-        assert(TagType == DeclSpec::TST_unspecified);
-        MaybeParseCXX11Attributes(Attrs);
-        ParsingDeclSpec PDS(*this);
-        Ptr = ParseExternalDeclaration(Attrs, &PDS);
-      } else {
-        Ptr =
-            ParseCXXClassMemberDeclarationWithPragmas(AS, Attrs, TagType, Tag);
-      }
-      if (Ptr) {
-        DeclGroupRef Ref = Ptr.get();
-        Decls.append(Ref.begin(), Ref.end());
-      }
+    if (HasImplicitMappings) {
+      Actions.ActOnStartOpenMPDeclareTargetContext(DTCI);
+      return nullptr;
     }
 
-    ParseOMPEndDeclareTargetDirective(DKind, DTLoc);
-    Actions.ActOnFinishOpenMPDeclareTargetDirective();
+    Actions.ActOnFinishedOpenMPDeclareTargetContext(DTCI);
+    llvm::SmallVector<Decl *, 4> Decls;
+    for (auto &It : DTCI.ExplicitlyMapped)
+      Decls.push_back(It.first);
     return Actions.BuildDeclaratorGroup(Decls);
   }
+  case OMPD_end_declare_target: {
+    if (!Actions.isInOpenMPDeclareTargetContext()) {
+      Diag(Tok, diag::err_omp_unexpected_directive)
+          << 1 << getOpenMPDirectiveName(DKind);
+      break;
+    }
+    const Sema::DeclareTargetContextInfo &DTCI =
+        Actions.ActOnOpenMPEndDeclareTargetDirective();
+    ParseOMPEndDeclareTargetDirective(DTCI.Kind, DKind, DTCI.Loc);
+    return nullptr;
+  }
   case OMPD_unknown:
     Diag(Tok, diag::err_omp_unknown_directive);
     break;
@@ -2191,7 +2203,6 @@
   case OMPD_parallel_master_taskloop:
   case OMPD_parallel_master_taskloop_simd:
   case OMPD_distribute:
-  case OMPD_end_declare_target:
   case OMPD_target_update:
   case OMPD_distribute_parallel_for:
   case OMPD_distribute_parallel_for_simd:
@@ -2570,6 +2581,7 @@
   }
   case OMPD_declare_simd:
   case OMPD_declare_target:
+  case OMPD_begin_declare_target:
   case OMPD_end_declare_target:
   case OMPD_requires:
   case OMPD_begin_declare_variant:
Index: clang/lib/CodeGen/CodeGenModule.h
===================================================================
--- clang/lib/CodeGen/CodeGenModule.h
+++ clang/lib/CodeGen/CodeGenModule.h
@@ -1356,6 +1356,10 @@
   /// \param D Requires declaration
   void EmitOMPRequiresDecl(const OMPRequiresDecl *D);
 
+  /// Emit a code for the allocate directive.
+  /// \param D The allocate declaration
+  void EmitOMPAllocateDecl(const OMPAllocateDecl *D);
+
   /// Returns whether the given record has hidden LTO visibility and therefore
   /// may participate in (single-module) CFI and whole-program vtable
   /// optimization.
Index: clang/lib/CodeGen/CodeGenModule.cpp
===================================================================
--- clang/lib/CodeGen/CodeGenModule.cpp
+++ clang/lib/CodeGen/CodeGenModule.cpp
@@ -2669,19 +2669,24 @@
 }
 
 bool CodeGenModule::MayBeEmittedEagerly(const ValueDecl *Global) {
+  // In OpenMP 5.0 variables and function may be marked as
+  // device_type(host/nohost) and we should not emit them eagerly unless we sure
+  // that they must be emitted on the host/device. To be sure we need to have
+  // seen a declare target with an explicit mentioning of the function, we know
+  // we have if the level of the declare target attribute is -1. Note that we
+  // check somewhere else if we should emit this at all.
+  if (LangOpts.OpenMP >= 50 && !LangOpts.OpenMPSimd) {
+    llvm::Optional<OMPDeclareTargetDeclAttr *> ActiveAttr =
+        OMPDeclareTargetDeclAttr::getActiveAttr(Global);
+    if (!ActiveAttr || (*ActiveAttr)->getLevel() != (unsigned)-1)
+      return false;
+  }
+
   if (const auto *FD = dyn_cast<FunctionDecl>(Global)) {
     if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
       // Implicit template instantiations may change linkage if they are later
       // explicitly instantiated, so they should not be emitted eagerly.
       return false;
-    // In OpenMP 5.0 function may be marked as device_type(nohost) and we should
-    // not emit them eagerly unless we sure that the function must be emitted on
-    // the host.
-    if (LangOpts.OpenMP >= 50 && !LangOpts.OpenMPSimd &&
-        !LangOpts.OpenMPIsDevice &&
-        !OMPDeclareTargetDeclAttr::getDeviceType(FD) &&
-        !FD->isUsed(/*CheckUsedAttr=*/false) && !FD->isReferenced())
-      return false;
   }
   if (const auto *VD = dyn_cast<VarDecl>(Global))
     if (Context.getInlineVariableDefinitionKind(VD) ==
@@ -4362,7 +4367,8 @@
 
     // Replace all uses of the old global with the new global
     llvm::Constant *NewPtrForOldDecl =
-        llvm::ConstantExpr::getBitCast(GV, Entry->getType());
+        llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(GV,
+                                                             Entry->getType());
     Entry->replaceAllUsesWith(NewPtrForOldDecl);
 
     // Erase the old global, since it is no longer used.
@@ -5873,6 +5879,7 @@
     break;
 
   case Decl::OMPAllocate:
+    EmitOMPAllocateDecl(cast<OMPAllocateDecl>(D));
     break;
 
   case Decl::OMPDeclareReduction:
Index: clang/lib/CodeGen/CGOpenMPRuntime.cpp
===================================================================
--- clang/lib/CodeGen/CGOpenMPRuntime.cpp
+++ clang/lib/CodeGen/CGOpenMPRuntime.cpp
@@ -15,6 +15,7 @@
 #include "CGCleanup.h"
 #include "CGRecordLayout.h"
 #include "CodeGenFunction.h"
+#include "clang/AST/APValue.h"
 #include "clang/AST/Attr.h"
 #include "clang/AST/Decl.h"
 #include "clang/AST/OpenMPClause.h"
@@ -2995,8 +2996,7 @@
   if (CGM.getLangOpts().OpenMPIsDevice) {
     // This could happen if the device compilation is invoked standalone.
     if (!hasTargetRegionEntryInfo(DeviceID, FileID, ParentName, LineNum))
-      initializeTargetRegionEntryInfo(DeviceID, FileID, ParentName, LineNum,
-                                      OffloadingEntriesNum);
+      return;
     auto &Entry =
         OffloadEntriesTargetRegion[DeviceID][FileID][ParentName][LineNum];
     Entry.setAddress(Addr);
@@ -3067,10 +3067,8 @@
   if (CGM.getLangOpts().OpenMPIsDevice) {
     // This could happen if the device compilation is invoked standalone.
     if (!hasDeviceGlobalVarEntryInfo(VarName))
-      initializeDeviceGlobalVarEntryInfo(VarName, Flags, OffloadingEntriesNum);
+      return;
     auto &Entry = OffloadEntriesDeviceGlobalVar[VarName];
-    assert((!Entry.getAddress() || Entry.getAddress() == Addr) &&
-           "Resetting with the new address.");
     if (Entry.getAddress() && hasDeviceGlobalVarEntryInfo(VarName)) {
       if (Entry.getVarSize().isZero()) {
         Entry.setVarSize(VarSize);
@@ -3086,8 +3084,6 @@
       auto &Entry = OffloadEntriesDeviceGlobalVar[VarName];
       assert(Entry.isValid() && Entry.getFlags() == Flags &&
              "Entry not initialized!");
-      assert((!Entry.getAddress() || Entry.getAddress() == Addr) &&
-             "Resetting with the new address.");
       if (Entry.getVarSize().isZero()) {
         Entry.setVarSize(VarSize);
         Entry.setLinkage(Linkage);
@@ -10517,17 +10513,28 @@
     scanForTargetRegionsFunctions(II, ParentName);
 }
 
+static bool isAssumedToBeNotEmitted(const ValueDecl *VD, bool IsDevice) {
+  Optional<OMPDeclareTargetDeclAttr::DevTypeTy> DevTy =
+      OMPDeclareTargetDeclAttr::getDeviceType(VD);
+  if (!DevTy)
+    return false;
+  // Do not emit device_type(nohost) functions for the host.
+  if (!IsDevice && DevTy == OMPDeclareTargetDeclAttr::DT_NoHost)
+    return true;
+  // Do not emit device_type(host) functions for the device.
+  if (IsDevice && DevTy == OMPDeclareTargetDeclAttr::DT_Host)
+    return true;
+  return false;
+}
+
 bool CGOpenMPRuntime::emitTargetFunctions(GlobalDecl GD) {
   // If emitting code for the host, we do not process FD here. Instead we do
   // the normal code generation.
   if (!CGM.getLangOpts().OpenMPIsDevice) {
-    if (const auto *FD = dyn_cast<FunctionDecl>(GD.getDecl())) {
-      Optional<OMPDeclareTargetDeclAttr::DevTypeTy> DevTy =
-          OMPDeclareTargetDeclAttr::getDeviceType(FD);
-      // Do not emit device_type(nohost) functions for the host.
-      if (DevTy && *DevTy == OMPDeclareTargetDeclAttr::DT_NoHost)
+    if (const auto *FD = dyn_cast<FunctionDecl>(GD.getDecl()))
+      if (isAssumedToBeNotEmitted(cast<ValueDecl>(FD),
+                                  CGM.getLangOpts().OpenMPIsDevice))
         return true;
-    }
     return false;
   }
 
@@ -10536,10 +10543,8 @@
   if (const auto *FD = dyn_cast<FunctionDecl>(VD)) {
     StringRef Name = CGM.getMangledName(GD);
     scanForTargetRegionsFunctions(FD->getBody(), Name);
-    Optional<OMPDeclareTargetDeclAttr::DevTypeTy> DevTy =
-        OMPDeclareTargetDeclAttr::getDeviceType(FD);
-    // Do not emit device_type(nohost) functions for the host.
-    if (DevTy && *DevTy == OMPDeclareTargetDeclAttr::DT_Host)
+    if (isAssumedToBeNotEmitted(cast<ValueDecl>(FD),
+                                CGM.getLangOpts().OpenMPIsDevice))
       return true;
   }
 
@@ -10549,6 +10554,10 @@
 }
 
 bool CGOpenMPRuntime::emitTargetGlobalVariable(GlobalDecl GD) {
+  if (isAssumedToBeNotEmitted(cast<ValueDecl>(GD.getDecl()),
+                              CGM.getLangOpts().OpenMPIsDevice))
+    return true;
+
   if (!CGM.getLangOpts().OpenMPIsDevice)
     return false;
 
@@ -10621,6 +10630,13 @@
   if (CGM.getLangOpts().OMPTargetTriples.empty() &&
       !CGM.getLangOpts().OpenMPIsDevice)
     return;
+
+  // If we have host/nohost variables, they do not need to be registered.
+  Optional<OMPDeclareTargetDeclAttr::DevTypeTy> DevTy =
+      OMPDeclareTargetDeclAttr::getDeviceType(VD);
+  if (DevTy && DevTy.getValue() != OMPDeclareTargetDeclAttr::DT_Any)
+    return;
+
   llvm::Optional<OMPDeclareTargetDeclAttr::MapTypeTy> Res =
       OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD);
   if (!Res) {
@@ -10651,6 +10667,10 @@
     Linkage = CGM.getLLVMLinkageVarDefinition(VD, /*IsConstant=*/false);
     // Temp solution to prevent optimizations of the internal variables.
     if (CGM.getLangOpts().OpenMPIsDevice && !VD->isExternallyVisible()) {
+      // Do not create a "ref-variable" if the original is not also available
+      // on the host.
+      if (!OffloadEntriesInfoManager.hasDeviceGlobalVarEntryInfo(VarName))
+        return;
       std::string RefName = getName({VarName, "ref"});
       if (!CGM.GetGlobalValue(RefName)) {
         llvm::Constant *AddrRef =
Index: clang/lib/CodeGen/CGDecl.cpp
===================================================================
--- clang/lib/CodeGen/CGDecl.cpp
+++ clang/lib/CodeGen/CGDecl.cpp
@@ -2613,3 +2613,62 @@
 void CodeGenModule::EmitOMPRequiresDecl(const OMPRequiresDecl *D) {
   getOpenMPRuntime().processRequiresDirective(D);
 }
+
+void CodeGenModule::EmitOMPAllocateDecl(const OMPAllocateDecl *D) {
+  for (Expr *E : const_cast<OMPAllocateDecl *>(D)->varlists()) {
+    auto *DE = cast<DeclRefExpr>(E);
+    auto *VD = cast<VarDecl>(DE->getDecl());
+
+    // Skipp all but globals.
+    if (!VD->hasGlobalStorage())
+      continue;
+
+    // Check if the global has been materialized yet or not. If not, we are done
+    // as any later generation will utilize the OMPAllocateDeclAttr. However, if
+    // we already emitted the global we might have done so before the
+    // OMPAllocateDeclAttr was attached, leading to the wrong address space
+    // (potentially). While not pretty, common practise is to remove the old IR
+    // global and generate a new one, so we do that here too. Uses are replaced
+    // properly.
+    StringRef MangledName = getMangledName(VD);
+    llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
+    if (!Entry)
+      continue;
+
+    // We can also keep the existing global if the address space is what we
+    // expect it to be, if not, it is replaced.
+    QualType ASTTy = VD->getType();
+    clang::LangAS GVAS = GetGlobalVarAddressSpace(VD);
+    auto TargetAS = getContext().getTargetAddressSpace(GVAS);
+
+    if (Entry->getType()->getAddressSpace() == TargetAS)
+      continue;
+
+    // Make sure the variable declaration knows about the new address space as
+    // well, this is temporarlily necessary to allow proper code generation but
+    // undone as the base language declarations might not agree with this
+    // address space.
+    VD->setType(getContext().getAddrSpaceQualType(ASTTy, GVAS));
+
+    // Move the old entry aside so that we'll create a new one.
+    Entry->setName(StringRef());
+
+    // Make a new global with the correct type / address space.
+    llvm::PointerType *PTy =
+        llvm::PointerType::get(getTypes().ConvertTypeForMem(ASTTy), TargetAS);
+    llvm::Constant *GV = GetOrCreateLLVMGlobal(MangledName, PTy, VD);
+
+    // Replace all uses of the old global with the new global
+    llvm::Constant *NewPtrForOldDecl =
+        llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(GV,
+                                                             Entry->getType());
+    Entry->replaceAllUsesWith(NewPtrForOldDecl);
+
+    // Erase the old global, since it is no longer used.
+    Entry->eraseFromParent();
+
+    // Reset the type to ensure a new base language declaration w/o address
+    // space is not going to conflict with the address space one.
+    VD->setType(ASTTy);
+  }
+}
Index: clang/lib/AST/AttrImpl.cpp
===================================================================
--- clang/lib/AST/AttrImpl.cpp
+++ clang/lib/AST/AttrImpl.cpp
@@ -141,57 +141,44 @@
     OS << ' ' << ConvertMapTypeTyToStr(getMapType());
 }
 
-llvm::Optional<OMPDeclareTargetDeclAttr::MapTypeTy>
-OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(const ValueDecl *VD) {
+llvm::Optional<OMPDeclareTargetDeclAttr *>
+OMPDeclareTargetDeclAttr::getActiveAttr(const ValueDecl *VD) {
   if (!VD->hasAttrs())
     return llvm::None;
   unsigned Level = 0;
-  const OMPDeclareTargetDeclAttr *FoundAttr = nullptr;
-  for (const auto *Attr : VD->specific_attrs<OMPDeclareTargetDeclAttr>()) {
-    if (Level < Attr->getLevel()) {
+  OMPDeclareTargetDeclAttr *FoundAttr = nullptr;
+  for (auto *Attr : VD->specific_attrs<OMPDeclareTargetDeclAttr>()) {
+    if (Level <= Attr->getLevel()) {
       Level = Attr->getLevel();
       FoundAttr = Attr;
     }
   }
   if (FoundAttr)
-    return FoundAttr->getMapType();
+    return FoundAttr;
+  return llvm::None;
+}
 
+llvm::Optional<OMPDeclareTargetDeclAttr::MapTypeTy>
+OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(const ValueDecl *VD) {
+  llvm::Optional<OMPDeclareTargetDeclAttr *> ActiveAttr = getActiveAttr(VD);
+  if (ActiveAttr.hasValue())
+    return ActiveAttr.getValue()->getMapType();
   return llvm::None;
 }
 
 llvm::Optional<OMPDeclareTargetDeclAttr::DevTypeTy>
 OMPDeclareTargetDeclAttr::getDeviceType(const ValueDecl *VD) {
-  if (!VD->hasAttrs())
-    return llvm::None;
-  unsigned Level = 0;
-  const OMPDeclareTargetDeclAttr *FoundAttr = nullptr;
-  for (const auto *Attr : VD->specific_attrs<OMPDeclareTargetDeclAttr>()) {
-    if (Level < Attr->getLevel()) {
-      Level = Attr->getLevel();
-      FoundAttr = Attr;
-    }
-  }
-  if (FoundAttr)
-    return FoundAttr->getDevType();
-
+  llvm::Optional<OMPDeclareTargetDeclAttr *> ActiveAttr = getActiveAttr(VD);
+  if (ActiveAttr.hasValue())
+    return ActiveAttr.getValue()->getDevType();
   return llvm::None;
 }
 
 llvm::Optional<SourceLocation>
 OMPDeclareTargetDeclAttr::getLocation(const ValueDecl *VD) {
-  if (!VD->hasAttrs())
-    return llvm::None;
-  unsigned Level = 0;
-  const OMPDeclareTargetDeclAttr *FoundAttr = nullptr;
-  for (const auto *Attr : VD->specific_attrs<OMPDeclareTargetDeclAttr>()) {
-    if (Level < Attr->getLevel()) {
-      Level = Attr->getLevel();
-      FoundAttr = Attr;
-    }
-  }
-  if (FoundAttr)
-    return FoundAttr->getRange().getBegin();
-
+  llvm::Optional<OMPDeclareTargetDeclAttr *> ActiveAttr = getActiveAttr(VD);
+  if (ActiveAttr.hasValue())
+    return ActiveAttr.getValue()->getRange().getBegin();
   return llvm::None;
 }
 
Index: clang/include/clang/Sema/Sema.h
===================================================================
--- clang/include/clang/Sema/Sema.h
+++ clang/include/clang/Sema/Sema.h
@@ -10207,8 +10207,31 @@
   //
 private:
   void *VarDataSharingAttributesStack;
+
+  struct DeclareTargetContextInfo {
+    struct MapInfo {
+      OMPDeclareTargetDeclAttr::MapTypeTy MT;
+      SourceLocation Loc;
+    };
+    /// Explicitly listed variables and functions in a 'to' or 'link' clause.
+    llvm::DenseMap<NamedDecl *, MapInfo> ExplicitlyMapped;
+
+    /// The 'device_type' as parsed from the clause.
+    OMPDeclareTargetDeclAttr::DevTypeTy DT = OMPDeclareTargetDeclAttr::DT_Any;
+
+    /// The directive kind, `begin declare target` or `declare target`.
+    OpenMPDirectiveKind Kind;
+
+    /// The directive location.
+    SourceLocation Loc;
+
+    DeclareTargetContextInfo(OpenMPDirectiveKind Kind, SourceLocation Loc)
+        : Kind(Kind), Loc(Loc) {}
+  };
+
   /// Number of nested '#pragma omp declare target' directives.
-  SmallVector<SourceLocation, 4> DeclareTargetNesting;
+  SmallVector<DeclareTargetContextInfo, 4> DeclareTargetNesting;
+
   /// Initialization of data-sharing attributes stack.
   void InitDataSharingAttributesStack();
   void DestroyDataSharingAttributesStack();
@@ -10474,19 +10497,28 @@
   const ValueDecl *getOpenMPDeclareMapperVarName() const;
 
   /// Called on the start of target region i.e. '#pragma omp declare target'.
-  bool ActOnStartOpenMPDeclareTargetDirective(SourceLocation Loc);
-  /// Called at the end of target region i.e. '#pragme omp end declare target'.
-  void ActOnFinishOpenMPDeclareTargetDirective();
+  bool ActOnStartOpenMPDeclareTargetContext(DeclareTargetContextInfo &DTCI);
+
+  /// Called at the end of target region i.e. '#pragma omp end declare target'.
+  const DeclareTargetContextInfo ActOnOpenMPEndDeclareTargetDirective();
+
+  /// Called once a target context is completed, that can be when a
+  /// '#pragma omp end declare target' was encountered or when a
+  /// '#pragma omp declare target' without declaration-definition-seq was
+  /// encountered.
+  void ActOnFinishedOpenMPDeclareTargetContext(DeclareTargetContextInfo &DTCI);
+
   /// Searches for the provided declaration name for OpenMP declare target
   /// directive.
-  NamedDecl *
-  lookupOpenMPDeclareTargetName(Scope *CurScope, CXXScopeSpec &ScopeSpec,
-                                const DeclarationNameInfo &Id,
-                                NamedDeclSetType &SameDirectiveDecls);
+  NamedDecl *lookupOpenMPDeclareTargetName(Scope *CurScope,
+                                           CXXScopeSpec &ScopeSpec,
+                                           const DeclarationNameInfo &Id);
+
   /// Called on correct id-expression from the '#pragma omp declare target'.
   void ActOnOpenMPDeclareTargetName(NamedDecl *ND, SourceLocation Loc,
                                     OMPDeclareTargetDeclAttr::MapTypeTy MT,
                                     OMPDeclareTargetDeclAttr::DevTypeTy DT);
+
   /// Check declaration inside target region.
   void
   checkDeclIsAllowedInOpenMPTarget(Expr *E, Decl *D,
Index: clang/include/clang/Parse/Parser.h
===================================================================
--- clang/include/clang/Parse/Parser.h
+++ clang/include/clang/Parse/Parser.h
@@ -3181,10 +3181,12 @@
   /// Parse 'omp end assumes' directive.
   void ParseOpenMPEndAssumesDirective(SourceLocation Loc);
 
-  /// Parse clauses for '#pragma omp declare target'.
-  DeclGroupPtrTy ParseOMPDeclareTargetClauses();
+  /// Parse clauses for '#pragma omp [begin] declare target'.
+  void ParseOMPDeclareTargetClauses(Sema::DeclareTargetContextInfo &DTCI);
+
   /// Parse '#pragma omp end declare target'.
-  void ParseOMPEndDeclareTargetDirective(OpenMPDirectiveKind DKind,
+  void ParseOMPEndDeclareTargetDirective(OpenMPDirectiveKind BeginDKind,
+                                         OpenMPDirectiveKind EndDKind,
                                          SourceLocation Loc);
 
   /// Skip tokens until a `annot_pragma_openmp_end` was found. Emit a warning if
Index: clang/include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -10222,8 +10222,6 @@
   InGroup<OpenMPClauses>;
 def err_omp_invalid_target_decl : Error<
   "%0 used in declare target directive is not a variable or a function name">;
-def err_omp_declare_target_multiple : Error<
-  "%0 appears multiple times in clauses on the same declare target directive">;
 def err_omp_declare_target_to_and_link : Error<
   "%0 must not appear in both clauses 'to' and 'link'">;
 def warn_omp_not_in_target_context : Warning<
Index: clang/include/clang/Basic/DiagnosticParseKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticParseKinds.td
+++ clang/include/clang/Basic/DiagnosticParseKinds.td
@@ -1314,7 +1314,15 @@
 def note_omp_assumption_clause_continue_here
     : Note<"the ignored tokens spans until here">;
 def err_omp_declare_target_unexpected_clause: Error<
-  "unexpected '%0' clause, only %select{'to' or 'link'|'to', 'link' or 'device_type'}1 clauses expected">;
+  "unexpected '%0' clause, only %select{'device_type'|'to' or 'link'|'to', 'link' or 'device_type'}1 clauses expected">;
+def err_omp_begin_declare_target_unexpected_implicit_to_clause: Error<
+  "unexpected '(', only 'to', 'link' or 'device_type' clauses expected for 'begin declare target' directive">;
+def err_omp_declare_target_unexpected_clause_after_implicit_to: Error<
+  "unexpected clause after an implicit 'to' clause">;
+def err_omp_declare_target_missing_to_or_link_clause: Error<
+  "expected at least one 'to' or 'link' clause">;
+def err_omp_declare_target_multiple : Error<
+  "%0 appears multiple times in clauses on the same declare target directive">;
 def err_omp_expected_clause: Error<
   "expected at least one clause on '#pragma omp %0' directive">;
 def err_omp_mapper_illegal_identifier : Error<
Index: clang/include/clang/Basic/Attr.td
===================================================================
--- clang/include/clang/Basic/Attr.td
+++ clang/include/clang/Basic/Attr.td
@@ -3606,6 +3606,7 @@
     void printPrettyPragma(raw_ostream &OS, const PrintingPolicy &Policy) const;
     static llvm::Optional<MapTypeTy>
     isDeclareTargetDeclaration(const ValueDecl *VD);
+    static llvm::Optional<OMPDeclareTargetDeclAttr*> getActiveAttr(const ValueDecl *VD);
     static llvm::Optional<DevTypeTy> getDeviceType(const ValueDecl *VD);
     static llvm::Optional<SourceLocation> getLocation(const ValueDecl *VD);
   }];
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