1 files changed, 124 insertions, 0 deletions
diff --git a/third_party/llvm-project/MCRegisterInfo.cpp b/third_party/llvm-project/MCRegisterInfo.cpp
new file mode 100644
index 000000000..d491c0eb7
--- /dev/null
+++ b/third_party/llvm-project/MCRegisterInfo.cpp
@@ -0,0 +1,124 @@
+//===- MC/MCRegisterInfo.cpp - Target Register Description ----------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements MCRegisterInfo functions.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MC/MCRegisterInfo.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Support/ErrorHandling.h"
+#include <algorithm>
+#include <cassert>
+#include <cstdint>
+
+using namespace llvm;
+
+MCRegister
+MCRegisterInfo::getMatchingSuperReg(MCRegister Reg, unsigned SubIdx,
+                                    const MCRegisterClass *RC) const {
+  for (MCSuperRegIterator Supers(Reg, this); Supers.isValid(); ++Supers)
+    if (RC->contains(*Supers) && Reg == getSubReg(*Supers, SubIdx))
+      return *Supers;
+  return 0;
+}
+
+MCRegister MCRegisterInfo::getSubReg(MCRegister Reg, unsigned Idx) const {
+  assert(Idx && Idx < getNumSubRegIndices() &&
+         "This is not a subregister index");
+  // Get a pointer to the corresponding SubRegIndices list. This list has the
+  // name of each sub-register in the same order as MCSubRegIterator.
+  const uint16_t *SRI = SubRegIndices + get(Reg).SubRegIndices;
+  for (MCSubRegIterator Subs(Reg, this); Subs.isValid(); ++Subs, ++SRI)
+    if (*SRI == Idx)
+      return *Subs;
+  return 0;
+}
+
+unsigned MCRegisterInfo::getSubRegIndex(MCRegister Reg,
+                                        MCRegister SubReg) const {
+  assert(SubReg && SubReg < getNumRegs() && "This is not a register");
+  // Get a pointer to the corresponding SubRegIndices list. This list has the
+  // name of each sub-register in the same order as MCSubRegIterator.
+  const uint16_t *SRI = SubRegIndices + get(Reg).SubRegIndices;
+  for (MCSubRegIterator Subs(Reg, this); Subs.isValid(); ++Subs, ++SRI)
+    if (*Subs == SubReg)
+      return *SRI;
+  return 0;
+}
+
+unsigned MCRegisterInfo::getSubRegIdxSize(unsigned Idx) const {
+  assert(Idx && Idx < getNumSubRegIndices() &&
+         "This is not a subregister index");
+  return SubRegIdxRanges[Idx].Size;
+}
+
+unsigned MCRegisterInfo::getSubRegIdxOffset(unsigned Idx) const {
+  assert(Idx && Idx < getNumSubRegIndices() &&
+         "This is not a subregister index");
+  return SubRegIdxRanges[Idx].Offset;
+}
+
+int MCRegisterInfo::getDwarfRegNum(MCRegister RegNum, bool isEH) const {
+  const DwarfLLVMRegPair *M = isEH ? EHL2DwarfRegs : L2DwarfRegs;
+  unsigned Size = isEH ? EHL2DwarfRegsSize : L2DwarfRegsSize;
+
+  if (!M)
+    return -1;
+  DwarfLLVMRegPair Key = { RegNum, 0 };
+  const DwarfLLVMRegPair *I = std::lower_bound(M, M+Size, Key);
+  if (I == M+Size || I->FromReg != RegNum)
+    return -1;
+  return I->ToReg;
+}
+
+Optional<unsigned> MCRegisterInfo::getLLVMRegNum(unsigned RegNum,
+                                                 bool isEH) const {
+  const DwarfLLVMRegPair *M = isEH ? EHDwarf2LRegs : Dwarf2LRegs;
+  unsigned Size = isEH ? EHDwarf2LRegsSize : Dwarf2LRegsSize;
+
+  if (!M)
+    return None;
+  DwarfLLVMRegPair Key = { RegNum, 0 };
+  const DwarfLLVMRegPair *I = std::lower_bound(M, M+Size, Key);
+  if (I != M + Size && I->FromReg == RegNum)
+    return I->ToReg;
+  return None;
+}
+
+int MCRegisterInfo::getDwarfRegNumFromDwarfEHRegNum(unsigned RegNum) const {
+  // On ELF platforms, DWARF EH register numbers are the same as DWARF
+  // other register numbers.  On Darwin x86, they differ and so need to be
+  // mapped.  The .cfi_* directives accept integer literals as well as
+  // register names and should generate exactly what the assembly code
+  // asked for, so there might be DWARF/EH register numbers that don't have
+  // a corresponding LLVM register number at all.  So if we can't map the
+  // EH register number to an LLVM register number, assume it's just a
+  // valid DWARF register number as is.
+  if (Optional<unsigned> LRegNum = getLLVMRegNum(RegNum, true))
+    return getDwarfRegNum(*LRegNum, false);
+  return RegNum;
+}
+
+int MCRegisterInfo::getSEHRegNum(MCRegister RegNum) const {
+  const DenseMap<MCRegister, int>::const_iterator I = L2SEHRegs.find(RegNum);
+  if (I == L2SEHRegs.end()) return (int)RegNum;
+  return I->second;
+}
+
+int MCRegisterInfo::getCodeViewRegNum(MCRegister RegNum) const {
+  if (L2CVRegs.empty())
+    report_fatal_error("target does not implement codeview register mapping");
+  const DenseMap<MCRegister, int>::const_iterator I = L2CVRegs.find(RegNum);
+  if (I == L2CVRegs.end())
+    report_fatal_error("unknown codeview register " + (RegNum < getNumRegs()
+                                                           ? getName(RegNum)
+                                                           : Twine(RegNum)));
+  return I->second;
+}