1//===--- SPIRVCallLowering.h - Call lowering --------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file describes how to lower LLVM calls to machine code calls.
10//
11//===----------------------------------------------------------------------===//
12
13#ifndef LLVM_LIB_TARGET_SPIRV_SPIRVCALLLOWERING_H
14#define LLVM_LIB_TARGET_SPIRV_SPIRVCALLLOWERING_H
15
16#include "SPIRVGlobalRegistry.h"
17#include "llvm/CodeGen/GlobalISel/CallLowering.h"
18
19namespace llvm {
20
21class SPIRVGlobalRegistry;
22class SPIRVTargetLowering;
23
24class SPIRVCallLowering : public CallLowering {
25private:
26 // Used to create and assign function, argument, and return type information.
27 SPIRVGlobalRegistry *GR;
28
29 // Used to postpone producing of indirect function pointer types
30 // after all indirect calls info is collected
31 struct SPIRVIndirectCall {
32 const Type *RetTy = nullptr;
33 SmallVector<Type *> ArgTys;
34 SmallVector<Register> ArgRegs;
35 Register Callee;
36 };
37 void produceIndirectPtrTypes(MachineIRBuilder &MIRBuilder) const;
38 mutable SmallVector<SPIRVIndirectCall> IndirectCalls;
39
40public:
41 SPIRVCallLowering(const SPIRVTargetLowering &TLI, SPIRVGlobalRegistry *GR);
42
43 // Built OpReturn or OpReturnValue.
44 bool lowerReturn(MachineIRBuilder &MIRBuiler, const Value *Val,
45 ArrayRef<Register> VRegs, FunctionLoweringInfo &FLI,
46 Register SwiftErrorVReg) const override;
47
48 // Build OpFunction, OpFunctionParameter, and any EntryPoint or Linkage data.
49 bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
50 ArrayRef<ArrayRef<Register>> VRegs,
51 FunctionLoweringInfo &FLI) const override;
52
53 // Build OpCall, or replace with a builtin function.
54 bool lowerCall(MachineIRBuilder &MIRBuilder,
55 CallLoweringInfo &Info) const override;
56};
57} // end namespace llvm
58
59#endif // LLVM_LIB_TARGET_SPIRV_SPIRVCALLLOWERING_H
60