1 // WebAssemblyMachineFunctionInfo.h-WebAssembly machine function info-*- C++ -*-
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// \brief This file declares WebAssembly-specific per-machine-function
14 //===----------------------------------------------------------------------===//
16 #ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMACHINEFUNCTIONINFO_H
17 #define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMACHINEFUNCTIONINFO_H
19 #include "llvm/CodeGen/MachineRegisterInfo.h"
23 /// This class is derived from MachineFunctionInfo and contains private
24 /// WebAssembly-specific information for each MachineFunction.
25 class WebAssemblyFunctionInfo final : public MachineFunctionInfo {
28 std::vector<MVT> Params;
30 /// A mapping from CodeGen vreg index to WebAssembly register number.
31 std::vector<unsigned> WARegs;
33 /// A mapping from CodeGen vreg index to a boolean value indicating whether
34 /// the given register is considered to be "stackified", meaning it has been
35 /// determined or made to meet the stack requirements:
36 /// - single use (per path)
37 /// - single def (per path)
38 /// - defined and used in LIFO order with other stack registers
39 BitVector VRegStackified;
42 explicit WebAssemblyFunctionInfo(MachineFunction &MF) : MF(MF) {}
43 ~WebAssemblyFunctionInfo() override;
45 void addParam(MVT VT) { Params.push_back(VT); }
46 const std::vector<MVT> &getParams() const { return Params; }
48 static const unsigned UnusedReg = -1u;
50 void stackifyVReg(unsigned VReg) {
51 if (TargetRegisterInfo::virtReg2Index(VReg) >= VRegStackified.size())
52 VRegStackified.resize(TargetRegisterInfo::virtReg2Index(VReg) + 1);
53 VRegStackified.set(TargetRegisterInfo::virtReg2Index(VReg));
55 bool isVRegStackified(unsigned VReg) const {
56 if (TargetRegisterInfo::virtReg2Index(VReg) >= VRegStackified.size())
58 return VRegStackified.test(TargetRegisterInfo::virtReg2Index(VReg));
62 void setWAReg(unsigned VReg, unsigned WAReg) {
63 assert(WAReg != UnusedReg);
64 assert(TargetRegisterInfo::virtReg2Index(VReg) < WARegs.size());
65 WARegs[TargetRegisterInfo::virtReg2Index(VReg)] = WAReg;
67 unsigned getWAReg(unsigned VReg) const {
68 assert(TargetRegisterInfo::virtReg2Index(VReg) < WARegs.size());
69 return WARegs[TargetRegisterInfo::virtReg2Index(VReg)];
71 // If new virtual registers are created after initWARegs has been called,
72 // this function can be used to add WebAssembly register mappings for them.
73 void addWAReg(unsigned VReg, unsigned WAReg) {
74 assert(VReg = WARegs.size());
75 WARegs.push_back(WAReg);
79 } // end namespace llvm