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annotate include/llvm/CodeGen/StackMapLivenessAnalysis.h @ 92:8a1cd0ffee6e

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Create prototype declaration automatically if prototype was not found when parsing continuation arguments.
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Fri, 17 Apr 2015 13:54:34 +0900
parents 54457678186b
children
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1 //===--- StackMapLivenessAnalysis - StackMap Liveness Analysis --*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This pass calculates the liveness for each basic block in a function and
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11 // attaches the register live-out information to a patchpoint intrinsic (if
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12 // present).
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13 //
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14 //===----------------------------------------------------------------------===//
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15
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16 #ifndef LLVM_CODEGEN_STACKMAPLIVENESSANALYSIS_H
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17 #define LLVM_CODEGEN_STACKMAPLIVENESSANALYSIS_H
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18
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19 #include "llvm/CodeGen/LivePhysRegs.h"
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20 #include "llvm/CodeGen/MachineFunctionPass.h"
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21
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22
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23 namespace llvm {
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24
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25 /// \brief This pass calculates the liveness information for each basic block in
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26 /// a function and attaches the register live-out information to a patchpoint
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27 /// intrinsic if present.
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28 ///
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29 /// This pass can be disabled via the -enable-patchpoint-liveness=false flag.
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30 /// The pass skips functions that don't have any patchpoint intrinsics. The
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31 /// information provided by this pass is optional and not required by the
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32 /// aformentioned intrinsic to function.
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33 class StackMapLiveness : public MachineFunctionPass {
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34 MachineFunction *MF;
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35 const TargetRegisterInfo *TRI;
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36 LivePhysRegs LiveRegs;
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37 public:
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38 static char ID;
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39
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40 /// \brief Default construct and initialize the pass.
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41 StackMapLiveness();
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42
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43 /// \brief Tell the pass manager which passes we depend on and what
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44 /// information we preserve.
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45 void getAnalysisUsage(AnalysisUsage &AU) const override;
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46
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47 /// \brief Calculate the liveness information for the given machine function.
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48 bool runOnMachineFunction(MachineFunction &MF) override;
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49
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50 private:
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51 /// \brief Performs the actual liveness calculation for the function.
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52 bool calculateLiveness();
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53
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54 /// \brief Add the current register live set to the instruction.
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55 void addLiveOutSetToMI(MachineInstr &MI);
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56
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57 /// \brief Create a register mask and initialize it with the registers from
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58 /// the register live set.
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59 uint32_t *createRegisterMask() const;
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60 };
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61
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62 } // llvm namespace
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63
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64 #endif