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;
31 std::vector<MVT> Results;
33 /// A mapping from CodeGen vreg index to WebAssembly register number.
34 std::vector<unsigned> WARegs;
36 /// A mapping from CodeGen vreg index to a boolean value indicating whether
37 /// the given register is considered to be "stackified", meaning it has been
38 /// determined or made to meet the stack requirements:
39 /// - single use (per path)
40 /// - single def (per path)
41 /// - defined and used in FIFO order with other stack registers
42 BitVector VRegStackified;
45 explicit WebAssemblyFunctionInfo(MachineFunction &MF) : MF(MF) {}
46 ~WebAssemblyFunctionInfo() override;
48 void addParam(MVT VT) { Params.push_back(VT); }
49 const std::vector<MVT> &getParams() const { return Params; }
51 void addResult(MVT VT) { Results.push_back(VT); }
52 const std::vector<MVT> &getResults() const { return Results; }
54 static const unsigned UnusedReg = -1u;
56 void stackifyVReg(unsigned VReg) {
57 if (TargetRegisterInfo::virtReg2Index(VReg) >= VRegStackified.size())
58 VRegStackified.resize(TargetRegisterInfo::virtReg2Index(VReg) + 1);
59 VRegStackified.set(TargetRegisterInfo::virtReg2Index(VReg));
61 bool isVRegStackified(unsigned VReg) const {
62 if (TargetRegisterInfo::virtReg2Index(VReg) >= VRegStackified.size())
64 return VRegStackified.test(TargetRegisterInfo::virtReg2Index(VReg));
68 void setWAReg(unsigned VReg, unsigned WAReg) {
69 assert(WAReg != UnusedReg);
70 WARegs[TargetRegisterInfo::virtReg2Index(VReg)] = WAReg;
72 unsigned getWAReg(unsigned VReg) const {
73 return WARegs[TargetRegisterInfo::virtReg2Index(VReg)];
77 } // end namespace llvm