| 1 | //===- LiveDebugVariables.h - Tracking debug info variables -----*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file provides the interface to the LiveDebugVariables analysis. |
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| 10 | // |
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| 11 | // The analysis removes DBG_VALUE instructions for virtual registers and tracks |
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| 12 | // live user variables in a data structure that can be updated during register |
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| 13 | // allocation. |
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| 14 | // |
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| 15 | // After register allocation new DBG_VALUE instructions are emitted to reflect |
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| 16 | // the new locations of user variables. |
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| 17 | // |
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| 18 | //===----------------------------------------------------------------------===// |
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| 19 | |
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| 20 | #ifndef LLVM_LIB_CODEGEN_LIVEDEBUGVARIABLES_H |
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| 21 | #define LLVM_LIB_CODEGEN_LIVEDEBUGVARIABLES_H |
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| 22 | |
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| 23 | #include "llvm/CodeGen/MachineFunctionPass.h" |
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| 24 | #include "llvm/Support/Compiler.h" |
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| 25 | |
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| 26 | namespace llvm { |
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| 27 | |
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| 28 | template <typename T> class ArrayRef; |
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| 29 | class LiveIntervals; |
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| 30 | class VirtRegMap; |
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| 31 | |
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| 32 | class LLVM_LIBRARY_VISIBILITY LiveDebugVariables : public MachineFunctionPass { |
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| 33 | void *pImpl = nullptr; |
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| 34 | |
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| 35 | public: |
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| 36 | static char ID; // Pass identification, replacement for typeid |
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| 37 | |
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| 38 | LiveDebugVariables(); |
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| 39 | ~LiveDebugVariables() override; |
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| 40 | |
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| 41 | /// splitRegister - Move any user variables in OldReg to the live ranges in |
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| 42 | /// NewRegs where they are live. Mark the values as unavailable where no new |
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| 43 | /// register is live. |
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| 44 | void splitRegister(Register OldReg, ArrayRef<Register> NewRegs, |
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| 45 | LiveIntervals &LIS); |
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| 46 | |
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| 47 | /// emitDebugValues - Emit new DBG_VALUE instructions reflecting the changes |
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| 48 | /// that happened during register allocation. |
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| 49 | /// @param VRM Rename virtual registers according to map. |
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| 50 | void emitDebugValues(VirtRegMap *VRM); |
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| 51 | |
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| 52 | /// dump - Print data structures to dbgs(). |
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| 53 | void dump() const; |
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| 54 | |
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| 55 | private: |
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| 56 | bool runOnMachineFunction(MachineFunction &) override; |
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| 57 | void releaseMemory() override; |
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| 58 | void getAnalysisUsage(AnalysisUsage &) const override; |
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| 59 | |
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| 60 | MachineFunctionProperties getSetProperties() const override { |
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| 61 | return MachineFunctionProperties().set( |
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| 62 | MachineFunctionProperties::Property::TracksDebugUserValues); |
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| 63 | } |
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| 64 | }; |
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| 65 | |
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| 66 | } // end namespace llvm |
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| 67 | |
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| 68 | #endif // LLVM_LIB_CODEGEN_LIVEDEBUGVARIABLES_H |
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| 69 | |
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