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// WebAssemblyMachineFunctionInfo.h-WebAssembly machine function info-*- C++ -*-
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief This file declares WebAssembly-specific per-machine-function
/// information.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMACHINEFUNCTIONINFO_H
#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMACHINEFUNCTIONINFO_H
#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
namespace llvm {
/// This class is derived from MachineFunctionInfo and contains private
/// WebAssembly-specific information for each MachineFunction.
class WebAssemblyFunctionInfo final : public MachineFunctionInfo {
MachineFunction &MF;
std::vector<MVT> Params;
/// A mapping from CodeGen vreg index to WebAssembly register number.
std::vector<unsigned> WARegs;
/// A mapping from CodeGen vreg index to a boolean value indicating whether
/// the given register is considered to be "stackified", meaning it has been
/// determined or made to meet the stack requirements:
/// - single use (per path)
/// - single def (per path)
/// - defined and used in LIFO order with other stack registers
BitVector VRegStackified;
// A virtual register holding the pointer to the vararg buffer for vararg
// functions. It is created and set in TLI::LowerFormalArguments and read by
// TLI::LowerVASTART
unsigned VarargVreg = -1U;
public:
explicit WebAssemblyFunctionInfo(MachineFunction &MF) : MF(MF) {}
~WebAssemblyFunctionInfo() override;
void addParam(MVT VT) { Params.push_back(VT); }
const std::vector<MVT> &getParams() const { return Params; }
unsigned getVarargBufferVreg() const {
assert(VarargVreg != -1U && "Vararg vreg hasn't been set");
return VarargVreg;
}
void setVarargBufferVreg(unsigned Reg) { VarargVreg = Reg; }
static const unsigned UnusedReg = -1u;
void stackifyVReg(unsigned VReg) {
if (TargetRegisterInfo::virtReg2Index(VReg) >= VRegStackified.size())
VRegStackified.resize(TargetRegisterInfo::virtReg2Index(VReg) + 1);
VRegStackified.set(TargetRegisterInfo::virtReg2Index(VReg));
}
bool isVRegStackified(unsigned VReg) const {
if (TargetRegisterInfo::virtReg2Index(VReg) >= VRegStackified.size())
return false;
return VRegStackified.test(TargetRegisterInfo::virtReg2Index(VReg));
}
void initWARegs();
void setWAReg(unsigned VReg, unsigned WAReg) {
assert(WAReg != UnusedReg);
assert(TargetRegisterInfo::virtReg2Index(VReg) < WARegs.size());
WARegs[TargetRegisterInfo::virtReg2Index(VReg)] = WAReg;
}
unsigned getWAReg(unsigned Reg) const {
assert(TargetRegisterInfo::virtReg2Index(Reg) < WARegs.size());
return WARegs[TargetRegisterInfo::virtReg2Index(Reg)];
}
// For a given stackified WAReg, return the id number to print with push/pop.
static unsigned getWARegStackId(unsigned Reg) {
assert(Reg & INT32_MIN);
return Reg & INT32_MAX;
}
};
} // end namespace llvm
#endif
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