llvm/lib/CodeGen/MIRYamlMapping.cpp

   1 //===- MIRYamlMapping.cpp - Describe mapping between MIR and YAML ---------===//
   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 // This file implements the mapping between various MIR data structures and
  10 // their corresponding YAML representation.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/CodeGen/MIRYamlMapping.h"
  15 #include "llvm/CodeGen/MachineFrameInfo.h"
  16 #include "llvm/Support/Error.h"
  17 #include "llvm/Support/FormatVariadic.h"
  18
  19 using namespace llvm;
  20 using namespace llvm::yaml;
  21
  22 FrameIndex::FrameIndex(int FI, const llvm::MachineFrameInfo &MFI) {
  23   IsFixed = MFI.isFixedObjectIndex(FI);
  24   if (IsFixed)
  25     FI -= MFI.getObjectIndexBegin();
  26   this->FI = FI;
  27 }
  28
  29 // Returns the value and if the frame index is fixed or not.
  30 Expected<int> FrameIndex::getFI(const llvm::MachineFrameInfo &MFI) const {
  31   int FI = this->FI;
  32   if (IsFixed) {
  33     if (unsigned(FI) >= MFI.getNumFixedObjects())
  34       return make_error<StringError>(
  35           formatv("invalid fixed frame index {0}", FI).str(),
  36           inconvertibleErrorCode());
  37     FI += MFI.getObjectIndexBegin();
  38   }
  39   if (unsigned(FI + MFI.getNumFixedObjects()) >= MFI.getNumObjects())
  40     return make_error<StringError>(formatv("invalid frame index {0}", FI).str(),
  41                                    inconvertibleErrorCode());
  42   return FI;
  43 }