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 }
44