diff options
Diffstat (limited to 'lib/CodeGen/LiveDebugVariables.h')
-rw-r--r-- | lib/CodeGen/LiveDebugVariables.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/lib/CodeGen/LiveDebugVariables.h b/lib/CodeGen/LiveDebugVariables.h new file mode 100644 index 0000000000..eba4fbede2 --- /dev/null +++ b/lib/CodeGen/LiveDebugVariables.h @@ -0,0 +1,57 @@ +//===- LiveDebugVariables.h - Tracking debug info variables ----*- c++ -*--===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file provides the interface to the LiveDebugVariables analysis. +// +// The analysis removes DBG_VALUE instructions for virtual registers and tracks +// live user variables in a data structure that can be updated during register +// allocation. +// +// After register allocation new DBG_VALUE instructions are emitted to reflect +// the new locations of user variables. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_CODEGEN_LIVEDEBUGVARIABLES_H +#define LLVM_CODEGEN_LIVEDEBUGVARIABLES_H + +#include "llvm/CodeGen/MachineFunctionPass.h" + +namespace llvm { + +class LiveDebugVariables : public MachineFunctionPass { + void *pImpl; +public: + static char ID; // Pass identification, replacement for typeid + + LiveDebugVariables(); + + /// renameRegister - Move any user variables in OldReg to NewReg:SubIdx. + /// @param OldReg Old virtual register that is going away. + /// @param NewReg New register holding the user variables. + /// @param SubIdx If NewReg is a virtual register, SubIdx may indicate a sub- + /// register. + void renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx); + + /// emitDebugValues - Emit new DBG_VALUE instructions reflecting the changes + /// that happened during register allocation. + void emitDebugValues(); + +private: + + /// runOnMachineFunction - Analyze and remove DBG_VALUE instructions. + virtual bool runOnMachineFunction(MachineFunction &); + + virtual void getAnalysisUsage(AnalysisUsage &) const; + +}; + +} // namespace llvm + +#endif // LLVM_CODEGEN_LIVEDEBUGVARIABLES_H |