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 "WebAssemblyRegisterInfo.h"
20 #include "llvm/CodeGen/MachineFunction.h"
21 #include "llvm/CodeGen/MachineRegisterInfo.h"
25 /// This class is derived from MachineFunctionInfo and contains private
26 /// WebAssembly-specific information for each MachineFunction.
27 class WebAssemblyFunctionInfo final : public MachineFunctionInfo {
30 std::vector<MVT> Params;
32 /// A mapping from CodeGen vreg index to WebAssembly register number.
33 std::vector<unsigned> WARegs;
35 /// A mapping from CodeGen vreg index to a boolean value indicating whether
36 /// the given register is considered to be "stackified", meaning it has been
37 /// determined or made to meet the stack requirements:
38 /// - single use (per path)
39 /// - single def (per path)
40 /// - defined and used in LIFO order with other stack registers
41 BitVector VRegStackified;
44 explicit WebAssemblyFunctionInfo(MachineFunction &MF) : MF(MF) {}
45 ~WebAssemblyFunctionInfo() override;
47 void addParam(MVT VT) { Params.push_back(VT); }
48 const std::vector<MVT> &getParams() const { return Params; }
50 static const unsigned UnusedReg = -1u;
52 void stackifyVReg(unsigned VReg) {
53 if (TargetRegisterInfo::virtReg2Index(VReg) >= VRegStackified.size())
54 VRegStackified.resize(TargetRegisterInfo::virtReg2Index(VReg) + 1);
55 VRegStackified.set(TargetRegisterInfo::virtReg2Index(VReg));
57 bool isVRegStackified(unsigned VReg) const {
58 if (TargetRegisterInfo::virtReg2Index(VReg) >= VRegStackified.size())
60 return VRegStackified.test(TargetRegisterInfo::virtReg2Index(VReg));
64 void setWAReg(unsigned VReg, unsigned WAReg) {
65 assert(WAReg != UnusedReg);
66 assert(TargetRegisterInfo::virtReg2Index(VReg) < WARegs.size());
67 WARegs[TargetRegisterInfo::virtReg2Index(VReg)] = WAReg;
69 unsigned getWAReg(unsigned VReg) const {
70 assert(TargetRegisterInfo::virtReg2Index(VReg) < WARegs.size());
71 return WARegs[TargetRegisterInfo::virtReg2Index(VReg)];
73 // If new virtual registers are created after initWARegs has been called,
74 // this function can be used to add WebAssembly register mappings for them.
75 void addWAReg(unsigned VReg, unsigned WAReg) {
76 assert(VReg = WARegs.size());
77 WARegs.push_back(WAReg);
81 } // end namespace llvm