asavonic created this revision.
Herald added subscribers: cfe-commits, Anastasia, yaxunl.
Size_t, intptr_t, uintptr_t and ptrdiff_t cannot be used as kernel
arguments, according to OpenCL Specification s6.9k:
The size in bytes of these types are implementation-defined and in
addition can also be different for the OpenCL device and the host
processor making it difficult to allocate buffer objects to be passed
as arguments to a kernel declared as pointer to these types.
Repository:
rC Clang
https://reviews.llvm.org/D49725
Files:
lib/Sema/SemaDecl.cpp
test/SemaOpenCL/invalid-kernel-parameters.cl
Index: test/SemaOpenCL/invalid-kernel-parameters.cl
===================================================================
--- test/SemaOpenCL/invalid-kernel-parameters.cl
+++ test/SemaOpenCL/invalid-kernel-parameters.cl
@@ -9,7 +9,30 @@
// bool, half, size_t, ptrdiff_t, intptr_t, and uintptr_t
// or a struct / union with any of these types in them
-// TODO: Ban int types, size_t, ptrdiff_t ...
+typedef __SIZE_TYPE__ size_t;
+typedef __PTRDIFF_TYPE__ ptrdiff_t;
+typedef __INTPTR_TYPE__ intptr_t;
+typedef __UINTPTR_TYPE__ uintptr_t;
+
+kernel void size_t_arg(size_t x) {} // expected-error{{'size_t' (aka 'unsigned int') cannot be used as the type of a kernel parameter}}
+
+kernel void ptrdiff_t_arg(ptrdiff_t x) {} // expected-error{{'ptrdiff_t' (aka 'int') cannot be used as the type of a kernel parameter}}
+
+kernel void intptr_t_arg(intptr_t x) {} // expected-error{{'intptr_t' (aka 'int') cannot be used as the type of a kernel parameter}}
+
+kernel void uintptr_t_arg(uintptr_t x) {} // expected-error{{'uintptr_t' (aka 'unsigned int') cannot be used as the type of a kernel parameter}}
+
+typedef size_t size_ty;
+struct SizeTStruct { // expected-note{{within field of type 'SizeTStruct' declared here}}
+ size_ty s; // expected-note{{field of illegal type 'size_ty' (aka 'unsigned int') declared here}}
+};
+kernel void size_t_struct_arg(struct SizeTStruct x) {} // expected-error{{'struct SizeTStruct' cannot be used as the type of a kernel parameter}}
+
+union SizeTUnion { // expected-note{{within field of type 'SizeTUnion' declared here}}
+ size_t s; // expected-note{{field of illegal type 'size_t' (aka 'unsigned int') declared here}}
+ float f;
+};
+kernel void size_t_union_arg(union SizeTUnion x) {} // expected-error{{'union SizeTUnion' cannot be used as the type of a kernel parameter}}
kernel void bool_arg(bool x) { } // expected-error{{'bool' cannot be used as the type of a kernel parameter}}
Index: lib/Sema/SemaDecl.cpp
===================================================================
--- lib/Sema/SemaDecl.cpp
+++ lib/Sema/SemaDecl.cpp
@@ -8049,6 +8049,29 @@
RecordKernelParam
};
+static bool isOpenCLSizeDependentType(ASTContext &C, QualType Ty) {
+ // Size dependent types are just typedefs to normal integer types
+ // (e.g. unsigned long), so we cannot distinguish them from other typedefs to
+ // integers other than by their names.
+ StringRef SizeTypeNames[] = {"size_t", "intptr_t", "uintptr_t", "ptrdiff_t"};
+
+ // Remove typedefs one by one until we reach a typedef
+ // for a size dependent type.
+ QualType DesugaredTy = Ty;
+ do {
+ ArrayRef<StringRef> Names(SizeTypeNames);
+ auto Match =
+ std::find(Names.begin(), Names.end(), DesugaredTy.getAsString());
+ if (Names.end() != Match)
+ return true;
+
+ Ty = DesugaredTy;
+ DesugaredTy = Ty.getSingleStepDesugaredType(C);
+ } while (DesugaredTy != Ty);
+
+ return false;
+}
+
static OpenCLParamType getOpenCLKernelParameterType(Sema &S, QualType PT) {
if (PT->isPointerType()) {
QualType PointeeType = PT->getPointeeType();
@@ -8061,8 +8084,13 @@
return PtrKernelParam;
}
- // TODO: Forbid the other integer types (size_t, ptrdiff_t...) when they can
- // be used as builtin types.
+ // OpenCL v1.2 s6.9.k:
+ // Arguments to kernel functions in a program cannot be declared with the
+ // built-in scalar types bool, half, size_t, ptrdiff_t, intptr_t, and
+ // uintptr_t or a struct and/or union that contain fields declared to be one
+ // of these built-in scalar types.
+ if (isOpenCLSizeDependentType(S.getASTContext(), PT))
+ return InvalidKernelParam;
if (PT->isImageType())
return PtrKernelParam;
@@ -8155,9 +8183,13 @@
SmallVector<const FieldDecl *, 4> HistoryStack;
HistoryStack.push_back(nullptr);
- const RecordDecl *PD = PT->castAs<RecordType>()->getDecl();
- VisitStack.push_back(PD);
+ // At this point we already handled everything except of a RecordType or
+ // an ArrayType[RecordType].
+ const RecordType *RecTy =
+ PT->getPointeeOrArrayElementType()->getAs<RecordType>();
+ const RecordDecl *OrigRecDecl = RecTy->getDecl();
+ VisitStack.push_back(RecTy->getDecl());
assert(VisitStack.back() && "First decl null?");
do {
@@ -8213,8 +8245,8 @@
S.Diag(Param->getLocation(), diag::err_bad_kernel_param_type) << PT;
}
- S.Diag(PD->getLocation(), diag::note_within_field_of_type)
- << PD->getDeclName();
+ S.Diag(OrigRecDecl->getLocation(), diag::note_within_field_of_type)
+ << OrigRecDecl->getDeclName();
// We have an error, now let's go back up through history and show where
// the offending field came from
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