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Differential D3373 Diff 9025 lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp

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lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp

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#include "DbgValueHistoryCalculator.h" #include "DbgValueHistoryCalculator.h"
#include "llvm/CodeGen/MachineBasicBlock.h" #include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFunction.h" #include "llvm/CodeGen/MachineFunction.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/Support/Debug.h" #include "llvm/Support/Debug.h"
#include "llvm/Target/TargetRegisterInfo.h" #include "llvm/Target/TargetRegisterInfo.h"
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assert(MI.getNumOperands() > 1 && "Invalid machine instruction!"); assert(MI.getNumOperands() > 1 && "Invalid machine instruction!");
// Keep track of user variables. // Keep track of user variables.
const MDNode *Var = MI.getDebugVariable(); DIVariable Var = MI.getDebugVariable();
// Variable is in a register, we need to check for clobbers. // Variable is in a register, we need to check for clobbers.
if (isDbgValueInDefinedReg(&MI)) if (isDbgValueInDefinedReg(&MI))
LiveUserVar[MI.getOperand(0).getReg()] = Var; LiveUserVar[MI.getOperand(0).getReg()] = Var;
// Check the history of this variable. // Check the history of this variable. A variable may be fragmented
SmallVectorImpl<const MachineInstr *> &History = Result[Var]; // into multiple pieces, but they still share one history.
DIVariable EntireVar = getEntireVariable(Var);
SmallVectorImpl<const MachineInstr *> &History = Result[EntireVar];
if (!History.empty()) { if (!History.empty()) {
// We have seen this variable before. Try to coalesce DBG_VALUEs. // We have seen this variable before. Try to coalesce DBG_VALUEs.
const MachineInstr *Prev = History.back(); const MachineInstr *Prev = History.back();
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LiveUserVar[Reg] = nullptr; LiveUserVar[Reg] = nullptr;
// Was MD last defined by a DBG_VALUE referring to Reg? // Was MD last defined by a DBG_VALUE referring to Reg?
auto HistI = Result.find(Var); DIVariable EntireVar = getEntireVariable(DIVariable(Var));
auto HistI = Result.find(EntireVar);
if (HistI == Result.end()) if (HistI == Result.end())
continue; continue;
SmallVectorImpl<const MachineInstr *> &History = HistI->second; SmallVectorImpl<const MachineInstr *> &History = HistI->second;
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