1 //===----- CGCUDARuntime.h - Interface to CUDA Runtimes ---------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This provides an abstract class for CUDA code generation.  Concrete
11 // subclasses of this implement code generation for specific CUDA
12 // runtime libraries.
13 //
14 //===----------------------------------------------------------------------===//
15 
16 #ifndef LLVM_CLANG_LIB_CODEGEN_CGCUDARUNTIME_H
17 #define LLVM_CLANG_LIB_CODEGEN_CGCUDARUNTIME_H
18 
19 namespace llvm {
20 class Function;
21 class GlobalVariable;
22 }
23 
24 namespace clang {
25 
26 class CUDAKernelCallExpr;
27 
28 namespace CodeGen {
29 
30 class CodeGenFunction;
31 class CodeGenModule;
32 class FunctionArgList;
33 class ReturnValueSlot;
34 class RValue;
35 
36 class CGCUDARuntime {
37 protected:
38   CodeGenModule &CGM;
39 
40 public:
41   // Global variable properties that must be passed to CUDA runtime.
42   enum DeviceVarFlags {
43     ExternDeviceVar = 0x01,   // extern
44     ConstantDeviceVar = 0x02, // __constant__
45   };
46 
CGCUDARuntime(CodeGenModule & CGM)47   CGCUDARuntime(CodeGenModule &CGM) : CGM(CGM) {}
48   virtual ~CGCUDARuntime();
49 
50   virtual RValue EmitCUDAKernelCallExpr(CodeGenFunction &CGF,
51                                         const CUDAKernelCallExpr *E,
52                                         ReturnValueSlot ReturnValue);
53 
54   /// Emits a kernel launch stub.
55   virtual void emitDeviceStub(CodeGenFunction &CGF, FunctionArgList &Args) = 0;
56   virtual void registerDeviceVar(llvm::GlobalVariable &Var, unsigned Flags) = 0;
57 
58   /// Constructs and returns a module initialization function or nullptr if it's
59   /// not needed. Must be called after all kernels have been emitted.
60   virtual llvm::Function *makeModuleCtorFunction() = 0;
61 
62   /// Returns a module cleanup function or nullptr if it's not needed.
63   /// Must be called after ModuleCtorFunction
64   virtual llvm::Function *makeModuleDtorFunction() = 0;
65 };
66 
67 /// Creates an instance of a CUDA runtime class.
68 CGCUDARuntime *CreateNVCUDARuntime(CodeGenModule &CGM);
69 
70 }
71 }
72 
73 #endif
74