[OPENMP] Added table with allowed nesting info for OpenMP regions (per request from Samuel F Antao).
llvm-svn: 212034
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index 6ff617f..c7e377e 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -971,6 +971,52 @@
bool CheckNestingOfRegions(Sema &SemaRef, DSAStackTy *Stack,
OpenMPDirectiveKind CurrentRegion,
SourceLocation StartLoc) {
+ // Allowed nesting of constructs
+ // +------------------+-----------------+------------------------------------+
+ // | Parent directive | Child directive | Closely (!), No-Closely(+), Both(*)|
+ // +------------------+-----------------+------------------------------------+
+ // | parallel | parallel | * |
+ // | parallel | for | * |
+ // | parallel | simd | * |
+ // | parallel | sections | * |
+ // | parallel | section | + |
+ // | parallel | single | * |
+ // +------------------+-----------------+------------------------------------+
+ // | for | parallel | * |
+ // | for | for | + |
+ // | for | simd | * |
+ // | for | sections | + |
+ // | for | section | + |
+ // | for | single | + |
+ // +------------------+-----------------+------------------------------------+
+ // | simd | parallel | |
+ // | simd | for | |
+ // | simd | simd | |
+ // | simd | sections | |
+ // | simd | section | |
+ // | simd | single | |
+ // +------------------+-----------------+------------------------------------+
+ // | sections | parallel | * |
+ // | sections | for | + |
+ // | sections | simd | * |
+ // | sections | sections | + |
+ // | sections | section | * |
+ // | sections | single | + |
+ // +------------------+-----------------+------------------------------------+
+ // | section | parallel | * |
+ // | section | for | + |
+ // | section | simd | * |
+ // | section | sections | + |
+ // | section | section | + |
+ // | section | single | + |
+ // +------------------+-----------------+------------------------------------+
+ // | single | parallel | * |
+ // | single | for | + |
+ // | single | simd | * |
+ // | single | sections | + |
+ // | single | section | + |
+ // | single | single | + |
+ // +------------------+-----------------+------------------------------------+
if (Stack->getCurScope()) {
auto ParentRegion = Stack->getParentDirective();
bool NestingProhibited = false;