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//===--- StackMapLivenessAnalysis - StackMap Liveness Analysis --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This pass calculates the liveness for each basic block in a function and
// attaches the register live-out information to a patchpoint intrinsic (if
// present).
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_STACKMAP_LIVENESS_ANALYSIS_H
#define LLVM_CODEGEN_STACKMAP_LIVENESS_ANALYSIS_H
#include "llvm/CodeGen/LivePhysRegs.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
namespace llvm {
/// \brief This pass calculates the liveness information for each basic block in
/// a function and attaches the register live-out information to a patchpoint
/// intrinsic if present.
///
/// This is an optional pass that has to be explicitly enabled via the
/// -enable-patchpoint-liveness flag. The pass skips functions that don't have
/// any patchpoint intrinsics. The information provided by this pass is optional
/// and not required by the aformentioned intrinsic to function.
class StackMapLiveness : public MachineFunctionPass {
MachineFunction *MF;
const TargetRegisterInfo *TRI;
LivePhysRegs LiveRegs;
public:
static char ID;
/// \brief Default construct and initialize the pass.
StackMapLiveness();
/// \brief Tell the pass manager which passes we depend on and what
/// information we preserve.
void getAnalysisUsage(AnalysisUsage &AU) const override;
/// \brief Calculate the liveness information for the given machine function.
bool runOnMachineFunction(MachineFunction &MF) override;
private:
/// \brief Performs the actual liveness calculation for the function.
bool calculateLiveness();
/// \brief Add the current register live set to the instruction.
void addLiveOutSetToMI(MachineInstr &MI);
/// \brief Create a register mask and initialize it with the registers from
/// the register live set.
uint32_t *createRegisterMask() const;
};
} // llvm namespace
#endif // LLVM_CODEGEN_STACKMAP_LIVENESS_ANALYSIS_H
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