llvm/lib/Target/WebAssembly/WebAssemblyDebugValueManager.cpp

   1 //===-- WebAssemblyDebugValueManager.cpp - WebAssembly DebugValue Manager -===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 ///
   9 /// \file
  10 /// This file implements the manager for MachineInstr DebugValues.
  11 ///
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "WebAssemblyDebugValueManager.h"
  15 #include "WebAssembly.h"
  16 #include "WebAssemblyMachineFunctionInfo.h"
  17 #include "llvm/CodeGen/MachineInstr.h"
  18
  19 using namespace llvm;
  20
  21 WebAssemblyDebugValueManager::WebAssemblyDebugValueManager(
  22     MachineInstr *Instr) {
  23   // This code differs from MachineInstr::collectDebugValues in that it scans
  24   // the whole BB, not just contiguous DBG_VALUEs.
  25   if (!Instr->getOperand(0).isReg())
  26     return;
  27   CurrentReg = Instr->getOperand(0).getReg();
  28
  29   MachineBasicBlock::iterator DI = *Instr;
  30   ++DI;
  31   for (MachineBasicBlock::iterator DE = Instr->getParent()->end(); DI != DE;
  32        ++DI) {
  33     if (DI->isDebugValue() &&
  34         DI->hasDebugOperandForReg(Instr->getOperand(0).getReg()))
  35       DbgValues.push_back(&*DI);
  36   }
  37 }
  38
  39 void WebAssemblyDebugValueManager::move(MachineInstr *Insert) {
  40   MachineBasicBlock *MBB = Insert->getParent();
  41   for (MachineInstr *DBI : reverse(DbgValues))
  42     MBB->splice(Insert, DBI->getParent(), DBI);
  43 }
  44
  45 void WebAssemblyDebugValueManager::updateReg(unsigned Reg) {
  46   for (auto *DBI : DbgValues)
  47     for (auto &MO : DBI->getDebugOperandsForReg(CurrentReg))
  48       MO.setReg(Reg);
  49   CurrentReg = Reg;
  50 }
  51
  52 void WebAssemblyDebugValueManager::clone(MachineInstr *Insert,
  53                                          unsigned NewReg) {
  54   MachineBasicBlock *MBB = Insert->getParent();
  55   MachineFunction *MF = MBB->getParent();
  56   for (MachineInstr *DBI : reverse(DbgValues)) {
  57     MachineInstr *Clone = MF->CloneMachineInstr(DBI);
  58     for (auto &MO : Clone->getDebugOperandsForReg(CurrentReg))
  59       MO.setReg(NewReg);
  60     MBB->insert(Insert, Clone);
  61   }
  62 }
  63
  64 void WebAssemblyDebugValueManager::replaceWithLocal(unsigned LocalId) {
  65   for (auto *DBI : DbgValues) {
  66     auto IndexType = DBI->isIndirectDebugValue()
  67                          ? llvm::WebAssembly::TI_LOCAL_INDIRECT
  68                          : llvm::WebAssembly::TI_LOCAL;
  69     for (auto &MO : DBI->getDebugOperandsForReg(CurrentReg))
  70       MO.ChangeToTargetIndex(IndexType, LocalId);
  71   }
  72 }