LLVM API Documentation
#include <LiveVariables.h>
Inheritance diagram for llvm::LiveVariables:
Definition at line 39 of file LiveVariables.h.
typedef std::vector<unsigned>::iterator llvm::LiveVariables::killed_iterator |
killed_iterator - Iterate over registers killed by a machine instruction
Definition at line 148 of file LiveVariables.h.
void llvm::LiveVariables::addVirtualRegisterDead | ( | unsigned | IncomingReg, | |
MachineInstr * | MI | |||
) | [inline] |
addVirtualRegisterDead - Add information about the fact that the specified register is dead after being used by the specified instruction.
Definition at line 261 of file LiveVariables.h.
References getVarInfo(), I, llvm::LiveVariables::VarInfo::Kills, MI, and V.
void llvm::LiveVariables::addVirtualRegisterKilled | ( | unsigned | IncomingReg, | |
MachineInstr * | MI | |||
) | [inline] |
addVirtualRegisterKilled - Add information about the fact that the specified register is killed after being used by the specified instruction.
Definition at line 209 of file LiveVariables.h.
References getVarInfo(), I, llvm::LiveVariables::VarInfo::Kills, MI, and V.
Referenced by llvm::LiveIntervals::addIntervalsForSpills().
killed_iterator llvm::LiveVariables::dead_begin | ( | MachineInstr * | MI | ) | [inline] |
killed_iterator llvm::LiveVariables::dead_end | ( | MachineInstr * | MI | ) | [inline] |
std::pair<killed_iterator, killed_iterator> llvm::LiveVariables::dead_range | ( | MachineInstr * | MI | ) | [inline] |
Definition at line 187 of file LiveVariables.h.
References getDeadDefsVector(), MI, and V.
Referenced by instructionChanged().
virtual void llvm::LiveVariables::getAnalysisUsage | ( | AnalysisUsage & | AU | ) | const [inline, virtual] |
getAnalysisUsage - This function should be overriden by passes that need analysis information to do their job. If a pass specifies that it uses a particular analysis result to this function, it can then use the getAnalysis<AnalysisType>() function, below.
Reimplemented from llvm::Pass.
Definition at line 310 of file LiveVariables.h.
References llvm::AnalysisUsage::setPreservesAll().
std::vector<unsigned>& llvm::LiveVariables::getDeadDefsVector | ( | MachineInstr * | MI | ) | [inline] |
Definition at line 155 of file LiveVariables.h.
Referenced by dead_begin(), dead_end(), dead_range(), and removeVirtualRegisterDead().
std::vector<unsigned>& llvm::LiveVariables::getKillsVector | ( | MachineInstr * | MI | ) | [inline] |
Definition at line 150 of file LiveVariables.h.
Referenced by killed_begin(), killed_end(), killed_range(), and removeVirtualRegisterKilled().
LiveVariables::VarInfo & LiveVariables::getVarInfo | ( | unsigned | RegIdx | ) |
getVarInfo - Return the VarInfo structure for the specified VIRTUAL register.
Definition at line 62 of file LiveVariables.cpp.
References llvm::MRegisterInfo::FirstVirtualRegister, and llvm::MRegisterInfo::isVirtualRegister().
Referenced by addVirtualRegisterDead(), addVirtualRegisterKilled(), instructionChanged(), removeVirtualRegisterDead(), removeVirtualRegisterKilled(), removeVirtualRegistersDead(), removeVirtualRegistersKilled(), and runOnMachineFunction().
void LiveVariables::HandleVirtRegUse | ( | VarInfo & | VRInfo, | |
MachineBasicBlock * | MBB, | |||
MachineInstr * | MI | |||
) |
Definition at line 124 of file LiveVariables.cpp.
References llvm::LiveVariables::VarInfo::DefInst, E, llvm::MachineInstr::getParent(), llvm::LiveVariables::VarInfo::Kills, MarkVirtRegAliveInBlock(), MBB, MI, PI, llvm::MachineBasicBlock::pred_begin(), and llvm::MachineBasicBlock::pred_end().
Referenced by runOnMachineFunction().
void LiveVariables::instructionChanged | ( | MachineInstr * | OldMI, | |
MachineInstr * | NewMI | |||
) |
instructionChanged - When the address of an instruction changes, this method should be called so that live variables can update its internal data structures. This removes the records for OldMI, transfering them to the records for NewMI.
Definition at line 370 of file LiveVariables.cpp.
References dead_range(), llvm::LiveVariables::VarInfo::DefInst, E, llvm::MachineInstr::getNumOperands(), llvm::MachineInstr::getOperand(), llvm::MachineOperand::getReg(), getVarInfo(), I, llvm::MRegisterInfo::isVirtualRegister(), killed_range(), llvm::LiveVariables::VarInfo::Kills, llvm::LiveVariables::VarInfo::removeKill(), llvm::tie(), and V.
killed_iterator llvm::LiveVariables::killed_begin | ( | MachineInstr * | MI | ) | [inline] |
killed_begin/end - Get access to the range of registers killed by a machine instruction.
Definition at line 164 of file LiveVariables.h.
References getKillsVector(), and MI.
killed_iterator llvm::LiveVariables::killed_end | ( | MachineInstr * | MI | ) | [inline] |
std::pair<killed_iterator, killed_iterator> llvm::LiveVariables::killed_range | ( | MachineInstr * | MI | ) | [inline] |
Definition at line 171 of file LiveVariables.h.
References getKillsVector(), MI, and V.
Referenced by instructionChanged().
bool LiveVariables::KillsRegister | ( | MachineInstr * | MI, | |
unsigned | Reg | |||
) | const |
KillsRegister - Return true if the specified instruction kills the specified register.
Definition at line 75 of file LiveVariables.cpp.
void LiveVariables::MarkVirtRegAliveInBlock | ( | VarInfo & | VRInfo, | |
MachineBasicBlock * | BB | |||
) |
Definition at line 96 of file LiveVariables.cpp.
References llvm::LiveVariables::VarInfo::AliveBlocks, llvm::LiveVariables::VarInfo::DefInst, E, llvm::MachineBasicBlock::getNumber(), llvm::MachineInstr::getParent(), llvm::LiveVariables::VarInfo::Kills, MBB, PI, llvm::MachineBasicBlock::pred_begin(), and llvm::MachineBasicBlock::pred_end().
Referenced by HandleVirtRegUse(), and runOnMachineFunction().
bool LiveVariables::RegisterDefIsDead | ( | MachineInstr * | MI, | |
unsigned | Reg | |||
) | const |
RegisterDefIsDead - Return true if the specified instruction defines the specified register, but that definition is dead.
Definition at line 85 of file LiveVariables.cpp.
virtual void llvm::LiveVariables::releaseMemory | ( | ) | [inline, virtual] |
releaseMemory() - This member can be implemented by a pass if it wants to be able to release its memory when it is no longer needed. The default behavior of passes is to hold onto memory for the entire duration of their lifetime (which is the entire compile time). For pipelined passes, this is not a big deal because that memory gets recycled every time the pass is invoked on another program unit. For IP passes, it is more important to free memory when it is unused.
Optionally implement this function to release pass memory when it is no longer used.
Reimplemented from llvm::Pass.
Definition at line 314 of file LiveVariables.h.
bool llvm::LiveVariables::removeVirtualRegisterDead | ( | unsigned | reg, | |
MachineBasicBlock * | MBB, | |||
MachineInstr * | MI | |||
) | [inline] |
removeVirtualRegisterDead - Remove the specified virtual register from the live variable information. Returns true if the variable was marked dead at the specified instruction, false otherwise.
Definition at line 280 of file LiveVariables.h.
References getDeadDefsVector(), getVarInfo(), MI, and V.
bool llvm::LiveVariables::removeVirtualRegisterKilled | ( | unsigned | reg, | |
MachineBasicBlock * | MBB, | |||
MachineInstr * | MI | |||
) | [inline] |
removeVirtualRegisterKilled - Remove the specified virtual register from the live variable information. Returns true if the variable was marked as killed by the specified instruction, false otherwise.
Definition at line 228 of file LiveVariables.h.
References getKillsVector(), getVarInfo(), MI, and V.
void llvm::LiveVariables::removeVirtualRegistersDead | ( | MachineInstr * | MI | ) | [inline] |
removeVirtualRegistersDead - Remove all of the specified dead registers from the live variable information.
Definition at line 297 of file LiveVariables.h.
References getVarInfo(), I, MI, Regs, and llvm::LiveVariables::VarInfo::removeKill().
void llvm::LiveVariables::removeVirtualRegistersKilled | ( | MachineInstr * | MI | ) | [inline] |
removeVirtualRegistersKilled - Remove all killed info for the specified instruction.
Definition at line 245 of file LiveVariables.h.
References getVarInfo(), I, MI, Regs, and llvm::LiveVariables::VarInfo::removeKill().
bool LiveVariables::runOnMachineFunction | ( | MachineFunction & | MF | ) | [virtual] |
runOnMachineFunction - This method must be overloaded to perform the desired machine code transformation or analysis.
Implements llvm::MachineFunctionPass.
Definition at line 188 of file LiveVariables.cpp.
References llvm::MachineBasicBlock::back(), llvm::MachineInstr::begin(), llvm::MachineBasicBlock::begin(), llvm::MachineFunction::begin(), llvm::LiveVariables::VarInfo::DefInst, llvm::df_ext_begin(), llvm::df_ext_end(), E, llvm::MachineBasicBlock::empty(), llvm::MachineFunction::end(), llvm::MachineBasicBlock::end(), llvm::MRegisterInfo::FirstVirtualRegister, llvm::TargetInstrInfo::get(), llvm::MRegisterInfo::getAllocatableSet(), llvm::TargetMachine::getInstrInfo(), llvm::MachineOperand::getMachineBasicBlock(), llvm::MachineBasicBlock::getNumber(), llvm::MachineInstr::getNumOperands(), llvm::MRegisterInfo::getNumRegs(), llvm::MachineInstr::getOpcode(), llvm::MachineInstr::getOperand(), llvm::TargetMachine::getRegisterInfo(), llvm::MachineFunction::getTarget(), getVarInfo(), HandleVirtRegUse(), I, llvm::TargetInstrDescriptor::ImplicitDefs, llvm::TargetInstrDescriptor::ImplicitUses, llvm::MRegisterInfo::isPhysicalRegister(), llvm::TargetInstrInfo::isReturn(), llvm::MRegisterInfo::isVirtualRegister(), llvm::LiveVariables::VarInfo::Kills, llvm::MachineFunction::livein_begin(), llvm::MachineFunction::livein_end(), llvm::MachineFunction::liveout_begin(), llvm::MachineFunction::liveout_end(), MarkVirtRegAliveInBlock(), MBB, MF, MI, llvm::TargetInstrInfo::PHI, llvm::MachineBasicBlock::succ_begin(), llvm::MachineBasicBlock::succ_end(), TII, and Visited.