1//===--- StackMapLivenessAnalysis - StackMap Liveness Analysis --*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This pass calculates the liveness for each basic block in a function and 11// attaches the register live-out information to a patchpoint intrinsic (if 12// present). 13// 14//===----------------------------------------------------------------------===// 15 16#ifndef LLVM_CODEGEN_STACKMAP_LIVENESS_ANALYSIS_H 17#define LLVM_CODEGEN_STACKMAP_LIVENESS_ANALYSIS_H 18 19#include "llvm/CodeGen/LivePhysRegs.h" 20#include "llvm/CodeGen/MachineFunctionPass.h" 21 22 23namespace llvm { 24 25/// \brief This pass calculates the liveness information for each basic block in 26/// a function and attaches the register live-out information to a patchpoint 27/// intrinsic if present. 28/// 29/// This pass can be disabled via the -enable-patchpoint-liveness=false flag. 30/// The pass skips functions that don't have any patchpoint intrinsics. The 31/// information provided by this pass is optional and not required by the 32/// aformentioned intrinsic to function. 33class StackMapLiveness : public MachineFunctionPass { 34 MachineFunction *MF; 35 const TargetRegisterInfo *TRI; 36 LivePhysRegs LiveRegs; 37public: 38 static char ID; 39 40 /// \brief Default construct and initialize the pass. 41 StackMapLiveness(); 42 43 /// \brief Tell the pass manager which passes we depend on and what 44 /// information we preserve. 45 void getAnalysisUsage(AnalysisUsage &AU) const override; 46 47 /// \brief Calculate the liveness information for the given machine function. 48 bool runOnMachineFunction(MachineFunction &MF) override; 49 50private: 51 /// \brief Performs the actual liveness calculation for the function. 52 bool calculateLiveness(); 53 54 /// \brief Add the current register live set to the instruction. 55 void addLiveOutSetToMI(MachineInstr &MI); 56 57 /// \brief Create a register mask and initialize it with the registers from 58 /// the register live set. 59 uint32_t *createRegisterMask() const; 60}; 61 62} // llvm namespace 63 64#endif // LLVM_CODEGEN_STACKMAP_LIVENESS_ANALYSIS_H 65