1 files changed, 100 insertions, 0 deletions
diff --git a/third_party/llvm-project/DWARFDataExtractor.cpp b/third_party/llvm-project/DWARFDataExtractor.cpp
new file mode 100644
index 000000000..53e676bc7
--- /dev/null
+++ b/third_party/llvm-project/DWARFDataExtractor.cpp
@@ -0,0 +1,100 @@
+//===- DWARFDataExtractor.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
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/DebugInfo/DWARF/DWARFDataExtractor.h"
+#include "llvm/BinaryFormat/Dwarf.h"
+#include "llvm/DebugInfo/DWARF/DWARFContext.h"
+
+using namespace llvm;
+
+uint64_t DWARFDataExtractor::getRelocatedValue(uint32_t Size, uint64_t *Off,
+                                               uint64_t *SecNdx,
+                                               Error *Err) const {
+  if (SecNdx)
+    *SecNdx = object::SectionedAddress::UndefSection;
+  if (!Section)
+    return getUnsigned(Off, Size, Err);
+  Optional<RelocAddrEntry> E = Obj->find(*Section, *Off);
+  uint64_t A = getUnsigned(Off, Size, Err);
+  if (!E)
+    return A;
+  if (SecNdx)
+    *SecNdx = E->SectionIndex;
+  uint64_t R = E->Resolver(E->Reloc, E->SymbolValue, A);
+  if (E->Reloc2)
+    R = E->Resolver(*E->Reloc2, E->SymbolValue2, R);
+  return R;
+}
+
+Optional<uint64_t>
+DWARFDataExtractor::getEncodedPointer(uint64_t *Offset, uint8_t Encoding,
+                                      uint64_t PCRelOffset) const {
+  if (Encoding == dwarf::DW_EH_PE_omit)
+    return None;
+
+  uint64_t Result = 0;
+  uint64_t OldOffset = *Offset;
+  // First get value
+  switch (Encoding & 0x0F) {
+  case dwarf::DW_EH_PE_absptr:
+    switch (getAddressSize()) {
+    case 2:
+    case 4:
+    case 8:
+      Result = getUnsigned(Offset, getAddressSize());
+      break;
+    default:
+      return None;
+    }
+    break;
+  case dwarf::DW_EH_PE_uleb128:
+    Result = getULEB128(Offset);
+    break;
+  case dwarf::DW_EH_PE_sleb128:
+    Result = getSLEB128(Offset);
+    break;
+  case dwarf::DW_EH_PE_udata2:
+    Result = getUnsigned(Offset, 2);
+    break;
+  case dwarf::DW_EH_PE_udata4:
+    Result = getUnsigned(Offset, 4);
+    break;
+  case dwarf::DW_EH_PE_udata8:
+    Result = getUnsigned(Offset, 8);
+    break;
+  case dwarf::DW_EH_PE_sdata2:
+    Result = getSigned(Offset, 2);
+    break;
+  case dwarf::DW_EH_PE_sdata4:
+    Result = getSigned(Offset, 4);
+    break;
+  case dwarf::DW_EH_PE_sdata8:
+    Result = getSigned(Offset, 8);
+    break;
+  default:
+    return None;
+  }
+  // Then add relative offset, if required
+  switch (Encoding & 0x70) {
+  case dwarf::DW_EH_PE_absptr:
+    // do nothing
+    break;
+  case dwarf::DW_EH_PE_pcrel:
+    Result += PCRelOffset;
+    break;
+  case dwarf::DW_EH_PE_datarel:
+  case dwarf::DW_EH_PE_textrel:
+  case dwarf::DW_EH_PE_funcrel:
+  case dwarf::DW_EH_PE_aligned:
+  default:
+    *Offset = OldOffset;
+    return None;
+  }
+
+  return Result;
+}