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///===- DroppedVariableStatsMIR.cpp ---------------------------------------===//
///
/// Part of the LLVM Project, under the Apache License v2.0 with LLVM
/// Exceptions. See https://llvm.org/LICENSE.txt for license information.
/// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
///
///===---------------------------------------------------------------------===//
/// \file
/// Dropped Variable Statistics for Debug Information. Reports any number
/// of DBG_VALUEs that get dropped due to an optimization pass.
///
///===---------------------------------------------------------------------===//
#include "llvm/CodeGen/DroppedVariableStatsMIR.h"
#include "llvm/IR/DebugInfoMetadata.h"
using namespace llvm;
void DroppedVariableStatsMIR::runBeforePass(StringRef PassID,
MachineFunction *MF) {
if (PassID == "Debug Variable Analysis")
return;
setup();
return runOnMachineFunction(MF, true);
}
void DroppedVariableStatsMIR::runAfterPass(StringRef PassID,
MachineFunction *MF) {
if (PassID == "Debug Variable Analysis")
return;
runOnMachineFunction(MF, false);
calculateDroppedVarStatsOnMachineFunction(MF, PassID, MF->getName().str());
cleanup();
}
void DroppedVariableStatsMIR::runOnMachineFunction(const MachineFunction *MF,
bool Before) {
auto &DebugVariables = DebugVariablesStack.back()[&MF->getFunction()];
auto FuncName = MF->getName();
MFunc = MF;
run(DebugVariables, FuncName, Before);
}
void DroppedVariableStatsMIR::calculateDroppedVarStatsOnMachineFunction(
const MachineFunction *MF, StringRef PassID, StringRef FuncOrModName) {
MFunc = MF;
StringRef FuncName = MF->getName();
const Function *Func = &MF->getFunction();
DebugVariables &DbgVariables = DebugVariablesStack.back()[Func];
calculateDroppedStatsAndPrint(DbgVariables, FuncName, PassID, FuncOrModName,
"MachineFunction", Func);
}
void DroppedVariableStatsMIR::visitEveryInstruction(
unsigned &DroppedCount, DenseMap<VarID, DILocation *> &InlinedAtsMap,
VarID Var) {
unsigned PrevDroppedCount = DroppedCount;
const DIScope *DbgValScope = std::get<0>(Var);
for (const auto &MBB : *MFunc) {
for (const auto &MI : MBB) {
if (!MI.isDebugInstr()) {
auto *DbgLoc = MI.getDebugLoc().get();
if (!DbgLoc)
continue;
auto *Scope = DbgLoc->getScope();
if (updateDroppedCount(DbgLoc, Scope, DbgValScope, InlinedAtsMap, Var,
DroppedCount))
break;
}
}
if (PrevDroppedCount != DroppedCount) {
PrevDroppedCount = DroppedCount;
break;
}
}
}
void DroppedVariableStatsMIR::visitEveryDebugRecord(
DenseSet<VarID> &VarIDSet,
DenseMap<StringRef, DenseMap<VarID, DILocation *>> &InlinedAtsMap,
StringRef FuncName, bool Before) {
for (const auto &MBB : *MFunc) {
for (const auto &MI : MBB) {
if (MI.isDebugValueLike()) {
auto *DbgVar = MI.getDebugVariable();
if (!DbgVar)
continue;
auto DbgLoc = MI.getDebugLoc();
populateVarIDSetAndInlinedMap(DbgVar, DbgLoc, VarIDSet, InlinedAtsMap,
FuncName, Before);
}
}
}
}
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