[OpenMP] Prevent nesting of target constructs within target code execution regions.

Summary:
This patch enhances Sema to check for the following restriction:

OpenMP 4.5 [2.17 Nesting of Regions]
If a target, target update, target data, target enter data, or
target exit data construct is encountered during execution of a
target region, the behavior is unspecified.

Reviewers: ABataev

Differential Revision: http://reviews.llvm.org/D16758

llvm-svn: 259366

1 files changed, 39 insertions, 0 deletions

diff --git a/clang/test/OpenMP/target_parallel_if_messages.cpp b/clang/test/OpenMP/target_parallel_if_messages.cpp
index 00e52d17ad7..e22eb8150af 100644
--- a/clang/test/OpenMP/target_parallel_if_messages.cpp
+++ b/clang/test/OpenMP/target_parallel_if_messages.cpp
@@ -12,25 +12,45 @@ struct S1; // expected-note {{declared here}}
 template <class T, class S> // expected-note {{declared here}}
 int tmain(T argc, S **argv) {
   #pragma omp target parallel if // expected-error {{expected '(' after 'if'}}
+  foo();
   #pragma omp target parallel if ( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
   #pragma omp target parallel if () // expected-error {{expected expression}}
+  foo();
   #pragma omp target parallel if (argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
   #pragma omp target parallel if (argc)) // expected-warning {{extra tokens at the end of '#pragma omp target parallel' are ignored}}
+  foo();
   #pragma omp target parallel if (argc > 0 ? argv[1] : argv[2])
+  foo();
   #pragma omp target parallel if (foobool(argc)), if (true) // expected-error {{directive '#pragma omp target parallel' cannot contain more than one 'if' clause}}
+  foo();
   #pragma omp target parallel if (S) // expected-error {{'S' does not refer to a value}}
+  foo();
   #pragma omp target parallel if (argv[1]=2) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
   #pragma omp target parallel if (argc argc) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
   #pragma omp target parallel if(argc)
+  foo();
   #pragma omp target parallel if(target : // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
   #pragma omp target parallel if(parallel : argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
   #pragma omp target parallel if(target : argc)
+  foo();
   #pragma omp target parallel if(parallel : argc)
+  foo();
   #pragma omp target parallel if(target : argc) if(parallel : argc)
+  foo();
   #pragma omp target parallel if(parallel : argc) if (for:argc) // expected-error {{directive name modifier 'for' is not allowed for '#pragma omp target parallel'}}
+  foo();
   #pragma omp target parallel if(target : argc) if (target :argc) // expected-error {{directive '#pragma omp target parallel' cannot contain more than one 'if' clause with 'target' name modifier}}
+  foo();
   #pragma omp target parallel if(parallel : argc) if (parallel :argc) // expected-error {{directive '#pragma omp target parallel' cannot contain more than one 'if' clause with 'parallel' name modifier}}
+  foo();
   #pragma omp target parallel if(target : argc) if (argc) // expected-error {{expected  'parallel' directive name modifier}} expected-note {{previous clause with directive name modifier specified here}}
+  foo();
   #pragma omp target parallel if(target : argc) if(parallel : argc) if (argc) // expected-error {{no more 'if' clause is allowed}} expected-note {{previous clause with directive name modifier specified here}} expected-note {{previous clause with directive name modifier specified here}}
   foo();
 
@@ -39,24 +59,43 @@ int tmain(T argc, S **argv) {
 
 int main(int argc, char **argv) {
   #pragma omp target parallel if // expected-error {{expected '(' after 'if'}}
+  foo();
   #pragma omp target parallel if ( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
   #pragma omp target parallel if () // expected-error {{expected expression}}
+  foo();
   #pragma omp target parallel if (argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
   #pragma omp target parallel if (argc)) // expected-warning {{extra tokens at the end of '#pragma omp target parallel' are ignored}}
+  foo();
   #pragma omp target parallel if (argc > 0 ? argv[1] : argv[2])
+  foo();
   #pragma omp target parallel if (foobool(argc)), if (true) // expected-error {{directive '#pragma omp target parallel' cannot contain more than one 'if' clause}}
+  foo();
   #pragma omp target parallel if (S1) // expected-error {{'S1' does not refer to a value}}
+  foo();
   #pragma omp target parallel if (argv[1]=2) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
   #pragma omp target parallel if (argc argc) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
   #pragma omp target parallel if (1 0) // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
   #pragma omp target parallel if(if(tmain(argc, argv) // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
   #pragma omp target parallel if(target : // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
   #pragma omp target parallel if(parallel : argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
+  foo();
   #pragma omp target parallel if(parallel : argc)
+  foo();
   #pragma omp target parallel if(target : argc) if (for:argc) // expected-error {{directive name modifier 'for' is not allowed for '#pragma omp target parallel'}}
+  foo();
   #pragma omp target parallel if(target : argc) if (target :argc) // expected-error {{directive '#pragma omp target parallel' cannot contain more than one 'if' clause with 'target' name modifier}}
+  foo();
   #pragma omp target parallel if(parallel : argc) if (parallel :argc) // expected-error {{directive '#pragma omp target parallel' cannot contain more than one 'if' clause with 'parallel' name modifier}}
+  foo();
   #pragma omp target parallel if(target : argc) if (argc) // expected-error {{expected  'parallel' directive name modifier}} expected-note {{previous clause with directive name modifier specified here}}
+  foo();
   #pragma omp target parallel if(target : argc) if(parallel : argc) if (argc) // expected-error {{no more 'if' clause is allowed}} expected-note {{previous clause with directive name modifier specified here}} expected-note {{previous clause with directive name modifier specified here}}
   foo();