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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 "clang/AST/GlobalDecl.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/IR/GlobalValue.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
};
/// The kind flag for an offloading entry.
enum OffloadEntryKindFlag : uint32_t {
/// Mark the entry as a global entry. This indicates the presense of a
/// kernel if the size field is zero and a variable otherwise.
OffloadGlobalEntry = 0x0,
/// Mark the entry as a managed global variable.
OffloadGlobalManagedEntry = 0x1,
/// Mark the entry as a surface variable.
OffloadGlobalSurfaceEntry = 0x2,
/// Mark the entry as a texture variable.
OffloadGlobalTextureEntry = 0x3,
};
private:
unsigned Kind : 2;
unsigned Extern : 1;
unsigned Constant : 1; // Constant variable.
unsigned Managed : 1; // Managed variable.
unsigned Normalized : 1; // Normalized texture.
int SurfTexType; // Type of surface/texutre.
public:
DeviceVarFlags(DeviceVarKind K, bool E, bool C, bool M, bool N, int T)
: Kind(K), Extern(E), Constant(C), Managed(M), Normalized(N),
SurfTexType(T) {}
DeviceVarKind getKind() const { return static_cast<DeviceVarKind>(Kind); }
bool isExtern() const { return Extern; }
bool isConstant() const { return Constant; }
bool isManaged() const { return Managed; }
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;
/// Check whether a variable is a device variable and register it if true.
virtual void handleVarRegistration(const VarDecl *VD,
llvm::GlobalVariable &Var) = 0;
/// Finalize generated LLVM module. Returns a module constructor function
/// to be added or a null pointer.
virtual llvm::Function *finalizeModule() = 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;
/// Get kernel handle by stub function.
virtual llvm::GlobalValue *getKernelHandle(llvm::Function *Stub,
GlobalDecl GD) = 0;
/// Get kernel stub by kernel handle.
virtual llvm::Function *getKernelStub(llvm::GlobalValue *Handle) = 0;
/// Adjust linkage of shadow variables in host compilation.
virtual void
internalizeDeviceSideVar(const VarDecl *D,
llvm::GlobalValue::LinkageTypes &Linkage) = 0;
};
/// Creates an instance of a CUDA runtime class.
CGCUDARuntime *CreateNVCUDARuntime(CodeGenModule &CGM);
}
}
#endif
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