From: Joey Gouly <joey.gouly@arm.com>
Date: Tue, 5 Nov 2013 12:30:39 +0000 (+0000)
Subject: Do not allow functions or kernels called 'main' in OpenCL.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=c879fe57330faa87ac22f39ec6f37d992db9790f;p=clang

Do not allow functions or kernels called 'main' in OpenCL.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194068 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/clang/Basic/DiagnosticSemaKinds.td b/include/clang/Basic/DiagnosticSemaKinds.td
index c1c701db08..ea0df85d72 100644
--- a/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/include/clang/Basic/DiagnosticSemaKinds.td
@@ -6670,7 +6670,7 @@ def err_wrong_sampler_addressspace: Error<
   "sampler type cannot be used with the __local and __global address space qualifiers">;
 def err_opencl_global_invalid_addr_space : Error<
   "global variables must have a constant address space qualifier">;
-
+def err_opencl_no_main : Error<"%select{function|kernel}0 cannot be called 'main'">;
 } // end of sema category
 
 let CategoryName = "OpenMP Issue" in {
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index d9dd4507de..222b70cdab 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -7694,6 +7694,13 @@ void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) {
     FD->setConstexpr(false);
   }
 
+  if (getLangOpts().OpenCL) {
+    Diag(FD->getLocation(), diag::err_opencl_no_main)
+        << FD->hasAttr<OpenCLKernelAttr>();
+    FD->setInvalidDecl();
+    return;
+  }
+
   QualType T = FD->getType();
   assert(T->isFunctionType() && "function decl is not of function type");
   const FunctionType* FT = T->castAs<FunctionType>();
diff --git a/test/SemaOpenCL/invalid-kernel.cl b/test/SemaOpenCL/invalid-kernel.cl
index 3eb2f71aaf..c12bd8414e 100644
--- a/test/SemaOpenCL/invalid-kernel.cl
+++ b/test/SemaOpenCL/invalid-kernel.cl
@@ -5,3 +5,11 @@ kernel void no_ptrptr(global int **i) { } // expected-error{{kernel parameter ca
 kernel int bar()  { // expected-error {{kernel must have void return type}}
   return 6;
 }
+
+kernel void main() { // expected-error {{kernel cannot be called 'main'}}
+
+}
+
+int main() { // expected-error {{function cannot be called 'main'}}
+  return 0;
+}