[flang][cuda] Add runtime check for passing device arrays

flang-rt/lib/cuda/descriptor.cpp

@@ -54,6 +54,14 @@ void RTDEF(CUFSyncGlobalDescriptor)(
   ((Descriptor *)devAddr, (Descriptor *)hostPtr, sourceFile, sourceLine);
 }
 
+void RTDEF(CUFDescriptorCheckSection)(
+    const Descriptor *desc, const char *sourceFile, int sourceLine) {
+  if (desc && !desc->IsContiguous()) {
+    Terminator terminator{sourceFile, sourceLine};
+    terminator.Crash("device array section argument is not contiguous");
+  }
+}
+
 RT_EXT_API_GROUP_END
 }
 } // namespace Fortran::runtime::cuda

flang/include/flang/Lower/LoweringOptions.def

@@ -63,5 +63,8 @@ ENUM_LOWERINGOPT(StackRepackArrays, unsigned, 1, 0)
 /// in the leading dimension.
 ENUM_LOWERINGOPT(RepackArraysWhole, unsigned, 1, 0)
 
+/// If true, CUDA Fortran runtime check is inserted.
+ENUM_LOWERINGOPT(CUDARuntimeCheck, unsigned, 1, 0)
+
 #undef LOWERINGOPT
 #undef ENUM_LOWERINGOPT

flang/include/flang/Optimizer/Builder/Runtime/CUDA/Descriptor.h

@@ -26,6 +26,11 @@ namespace fir::runtime::cuda {
 void genSyncGlobalDescriptor(fir::FirOpBuilder &builder, mlir::Location loc,
                              mlir::Value hostPtr);
 
+/// Generate runtime call to check the section of a descriptor and raise an
+/// error if it is not contiguous.
+void genDescriptorCheckSection(fir::FirOpBuilder &builder, mlir::Location loc,
+                               mlir::Value desc);
+
 } // namespace fir::runtime::cuda
 
 #endif // FORTRAN_OPTIMIZER_BUILDER_RUNTIME_CUDA_DESCRIPTOR_H_

flang/include/flang/Runtime/CUDA/descriptor.h

@@ -37,6 +37,10 @@ void RTDECL(CUFDescriptorSync)(Descriptor *dst, const Descriptor *src,
 void RTDECL(CUFSyncGlobalDescriptor)(
     void *hostPtr, const char *sourceFile = nullptr, int sourceLine = 0);
 
+/// Check descriptor passed to a kernel.
+void RTDECL(CUFDescriptorCheckSection)(
+    const Descriptor *, const char *sourceFile = nullptr, int sourceLine = 0);
+
 } // extern "C"
 
 } // namespace Fortran::runtime::cuda

flang/lib/Lower/ConvertCall.cpp

@@ -26,6 +26,7 @@
 #include "flang/Optimizer/Builder/IntrinsicCall.h"
 #include "flang/Optimizer/Builder/LowLevelIntrinsics.h"
 #include "flang/Optimizer/Builder/MutableBox.h"
+#include "flang/Optimizer/Builder/Runtime/CUDA/Descriptor.h"
 #include "flang/Optimizer/Builder/Runtime/Derived.h"
 #include "flang/Optimizer/Builder/Todo.h"
 #include "flang/Optimizer/Dialect/CUF/CUFOps.h"
@@ -543,6 +544,19 @@ Fortran::lower::genCallOpAndResult(
   fir::FortranProcedureFlagsEnumAttr procAttrs =
       caller.getProcedureAttrs(builder.getContext());
 
+  if (converter.getLoweringOptions().getCUDARuntimeCheck()) {
+    if (caller.getCallDescription().chevrons().empty()) {
+      for (auto [oper, arg] :
+           llvm::zip(operands, caller.getPassedArguments())) {
+        if (auto boxTy = mlir::dyn_cast<fir::BaseBoxType>(oper.getType())) {
+          const Fortran::semantics::Symbol *sym = caller.getDummySymbol(arg);
+          if (sym && Fortran::evaluate::IsCUDADeviceSymbol(*sym))
+            fir::runtime::cuda::genDescriptorCheckSection(builder, loc, oper);
+        }
+      }
+    }
+  }
+
   if (!caller.getCallDescription().chevrons().empty()) {
     // A call to a CUDA kernel with the chevron syntax.
 

flang/lib/Optimizer/Builder/Runtime/CUDA/Descriptor.cpp

@@ -32,3 +32,18 @@ void fir::runtime::cuda::genSyncGlobalDescriptor(fir::FirOpBuilder &builder,
       builder, loc, fTy, hostPtr, sourceFile, sourceLine)};
   builder.create<fir::CallOp>(loc, callee, args);
 }
+
+void fir::runtime::cuda::genDescriptorCheckSection(fir::FirOpBuilder &builder,
+                                                   mlir::Location loc,
+                                                   mlir::Value desc) {
+  mlir::func::FuncOp func =
+      fir::runtime::getRuntimeFunc<mkRTKey(CUFDescriptorCheckSection)>(loc,
+                                                                       builder);
+  auto fTy = func.getFunctionType();
+  mlir::Value sourceFile = fir::factory::locationToFilename(builder, loc);
+  mlir::Value sourceLine =
+      fir::factory::locationToLineNo(builder, loc, fTy.getInput(2));
+  llvm::SmallVector<mlir::Value> args{fir::runtime::createArguments(
+      builder, loc, fTy, desc, sourceFile, sourceLine)};
+  builder.create<fir::CallOp>(loc, func, args);
+}

flang/test/Lower/CUDA/cuda-runtime-check.cuf

@@ -0,0 +1,22 @@
+! RUN: bbc -emit-hlfir -fcuda %s -o - | FileCheck %s
+
+! Check insertion of runtime checks
+
+interface
+  subroutine foo(a)
+    real, device, dimension(:,:) :: a
+  end subroutine
+end interface
+
+  real, device, allocatable, dimension(:,:) :: a
+  allocate(a(10,10))
+  call foo(a(1:10,1:10:2))
+end
+
+subroutine foo(a)
+  real, device, dimension(:,:) :: a
+end subroutine
+
+! CHECK-LABEL: func.func @_QQmain()
+! CHECK: fir.call @_FortranACUFDescriptorCheckSection
+! CHECK: fir.call @_QPfoo

flang/tools/bbc/bbc.cpp

@@ -434,6 +434,8 @@ static llvm::LogicalResult convertFortranSourceToMLIR(
   loweringOptions.setStackRepackArrays(stackRepackArrays);
   loweringOptions.setRepackArrays(repackArrays);
   loweringOptions.setRepackArraysWhole(repackArraysWhole);
+  if (enableCUDA)
+    loweringOptions.setCUDARuntimeCheck(true);
   std::vector<Fortran::lower::EnvironmentDefault> envDefaults = {};
   Fortran::frontend::TargetOptions targetOpts;
   Fortran::frontend::CodeGenOptions cgOpts;