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//===----- CGCUDARuntime.h - Interface to CUDA Runtimes ---------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This provides an abstract class for CUDA code generation. Concrete
// subclasses of this implement code generation for specific CUDA
// runtime libraries.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LIB_CODEGEN_CGCUDARUNTIME_H
#define LLVM_CLANG_LIB_CODEGEN_CGCUDARUNTIME_H
#include "llvm/ADT/StringRef.h"
namespace llvm {
class Function;
class GlobalVariable;
}
namespace clang {
class CUDAKernelCallExpr;
class NamedDecl;
class VarDecl;
namespace CodeGen {
class CodeGenFunction;
class CodeGenModule;
class FunctionArgList;
class ReturnValueSlot;
class RValue;
class CGCUDARuntime {
protected:
CodeGenModule &CGM;
public:
// Global variable properties that must be passed to CUDA runtime.
class DeviceVarFlags {
public:
enum DeviceVarKind {
Variable, // Variable
Surface, // Builtin surface
Texture, // Builtin texture
};
private:
unsigned Kind : 2;
unsigned Extern : 1;
unsigned Constant : 1; // Constant variable.
unsigned Normalized : 1; // Normalized texture.
int SurfTexType; // Type of surface/texutre.
public:
DeviceVarFlags(DeviceVarKind K, bool E, bool C, bool N, int T)
: Kind(K), Extern(E), Constant(C), Normalized(N), SurfTexType(T) {}
DeviceVarKind getKind() const { return static_cast<DeviceVarKind>(Kind); }
bool isExtern() const { return Extern; }
bool isConstant() const { return Constant; }
bool isNormalized() const { return Normalized; }
int getSurfTexType() const { return SurfTexType; }
};
CGCUDARuntime(CodeGenModule &CGM) : CGM(CGM) {}
virtual ~CGCUDARuntime();
virtual RValue EmitCUDAKernelCallExpr(CodeGenFunction &CGF,
const CUDAKernelCallExpr *E,
ReturnValueSlot ReturnValue);
/// Emits a kernel launch stub.
virtual void emitDeviceStub(CodeGenFunction &CGF, FunctionArgList &Args) = 0;
virtual void registerDeviceVar(const VarDecl *VD, llvm::GlobalVariable &Var,
bool Extern, bool Constant) = 0;
virtual void registerDeviceSurf(const VarDecl *VD, llvm::GlobalVariable &Var,
bool Extern, int Type) = 0;
virtual void registerDeviceTex(const VarDecl *VD, llvm::GlobalVariable &Var,
bool Extern, int Type, bool Normalized) = 0;
/// Constructs and returns a module initialization function or nullptr if it's
/// not needed. Must be called after all kernels have been emitted.
virtual llvm::Function *makeModuleCtorFunction() = 0;
/// Returns a module cleanup function or nullptr if it's not needed.
/// Must be called after ModuleCtorFunction
virtual llvm::Function *makeModuleDtorFunction() = 0;
/// Returns function or variable name on device side even if the current
/// compilation is for host.
virtual std::string getDeviceSideName(const NamedDecl *ND) = 0;
};
/// Creates an instance of a CUDA runtime class.
CGCUDARuntime *CreateNVCUDARuntime(CodeGenModule &CGM);
}
}
#endif
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