X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FDebugInfo%2FDWARFDebugInfoEntry.cpp;h=583e70055c0104e7b9970f6f42f03d8a43ba6fc3;hb=7435fa333d1b646690021bfaa9350355017d0bdf;hp=1b089adbe13b5f52f61ba1420ae4391e75184b13;hpb=34f864fd382156331c61fbb6b7ae4828108b9d69;p=oota-llvm.git

diff --git a/lib/DebugInfo/DWARFDebugInfoEntry.cpp b/lib/DebugInfo/DWARFDebugInfoEntry.cpp
index 1b089adbe13..583e70055c0 100644
--- a/lib/DebugInfo/DWARFDebugInfoEntry.cpp
+++ b/lib/DebugInfo/DWARFDebugInfoEntry.cpp
@@ -1,4 +1,4 @@
-//===-- DWARFDebugInfoEntry.cpp --------------------------------------------===//
+//===-- DWARFDebugInfoEntry.cpp -------------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -11,22 +11,34 @@
 #include "DWARFCompileUnit.h"
 #include "DWARFContext.h"
 #include "DWARFDebugAbbrev.h"
-#include "DWARFFormValue.h"
+#include "llvm/DebugInfo/DWARFFormValue.h"
+#include "llvm/Support/DataTypes.h"
+#include "llvm/Support/Debug.h"
 #include "llvm/Support/Dwarf.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 using namespace dwarf;
 
-void DWARFDebugInfoEntryMinimal::dump(raw_ostream &OS,
-                                      const DWARFCompileUnit *cu,
+// Small helper to extract a DIE pointed by a reference
+// attribute. It looks up the Unit containing the DIE and calls
+// DIE.extractFast with the right unit. Returns new unit on success,
+// nullptr otherwise.
+static const DWARFUnit *findUnitAndExtractFast(DWARFDebugInfoEntryMinimal &DIE,
+                                               const DWARFUnit *Unit,
+                                               uint32_t *Offset) {
+  Unit = Unit->getUnitSection().getUnitForOffset(*Offset);
+  return (Unit && DIE.extractFast(Unit, Offset)) ? Unit : nullptr;
+}
+
+void DWARFDebugInfoEntryMinimal::dump(raw_ostream &OS, DWARFUnit *u,
                                       unsigned recurseDepth,
                                       unsigned indent) const {
-  DataExtractor debug_info_data = cu->getDebugInfoExtractor();
+  DataExtractor debug_info_data = u->getDebugInfoExtractor();
   uint32_t offset = Offset;
 
   if (debug_info_data.isValidOffset(offset)) {
-    uint64_t abbrCode = debug_info_data.getULEB128(&offset);
+    uint32_t abbrCode = debug_info_data.getULEB128(&offset);
 
     OS << format("\n0x%8.8x: ", Offset);
     if (abbrCode) {
@@ -39,18 +51,15 @@ void DWARFDebugInfoEntryMinimal::dump(raw_ostream &OS,
         OS << format(" [%u] %c\n", abbrCode,
                      AbbrevDecl->hasChildren() ? '*' : ' ');
 
-        // Dump all data in the .debug_info for the attributes
-        const uint32_t numAttributes = AbbrevDecl->getNumAttributes();
-        for (uint32_t i = 0; i != numAttributes; ++i) {
-          uint16_t attr = AbbrevDecl->getAttrByIndex(i);
-          uint16_t form = AbbrevDecl->getFormByIndex(i);
-          dumpAttribute(OS, cu, &offset, attr, form, indent);
+        // Dump all data in the DIE for the attributes.
+        for (const auto &AttrSpec : AbbrevDecl->attributes()) {
+          dumpAttribute(OS, u, &offset, AttrSpec.Attr, AttrSpec.Form, indent);
         }
 
         const DWARFDebugInfoEntryMinimal *child = getFirstChild();
         if (recurseDepth > 0 && child) {
           while (child) {
-            child->dump(OS, cu, recurseDepth-1, indent+2);
+            child->dump(OS, u, recurseDepth-1, indent+2);
             child = child->getSibling();
           }
         }
@@ -64,13 +73,42 @@ void DWARFDebugInfoEntryMinimal::dump(raw_ostream &OS,
   }
 }
 
+static void dumpApplePropertyAttribute(raw_ostream &OS, uint64_t Val) {
+  OS << " (";
+  do {
+    uint64_t Bit = 1ULL << countTrailingZeros(Val);
+    if (const char *PropName = ApplePropertyString(Bit))
+      OS << PropName;
+    else
+      OS << format("DW_APPLE_PROPERTY_0x%" PRIx64, Bit);
+    if (!(Val ^= Bit))
+      break;
+    OS << ", ";
+  } while (true);
+  OS << ")";
+}
+
+static void dumpRanges(raw_ostream &OS, const DWARFAddressRangesVector& Ranges,
+                       unsigned AddressSize, unsigned Indent) {
+  if (Ranges.empty())
+    return;
+
+  for (const auto &Range: Ranges) {
+    OS << '\n';
+    OS.indent(Indent);
+    OS << format("[0x%0*" PRIx64 " - 0x%0*" PRIx64 ")",
+                 AddressSize*2, Range.first,
+                 AddressSize*2, Range.second);
+  }
+}
+
 void DWARFDebugInfoEntryMinimal::dumpAttribute(raw_ostream &OS,
-                                               const DWARFCompileUnit *cu,
-                                               uint32_t* offset_ptr,
-                                               uint16_t attr,
-                                               uint16_t form,
+                                               DWARFUnit *u,
+                                               uint32_t *offset_ptr,
+                                               uint16_t attr, uint16_t form,
                                                unsigned indent) const {
-  OS << format("0x%8.8x: ", *offset_ptr);
+  const char BaseIndent[] = "            ";
+  OS << BaseIndent;
   OS.indent(indent+2);
   const char *attrString = AttributeString(attr);
   if (attrString)
@@ -85,360 +123,329 @@ void DWARFDebugInfoEntryMinimal::dumpAttribute(raw_ostream &OS,
 
   DWARFFormValue formValue(form);
 
-  if (!formValue.extractValue(cu->getDebugInfoExtractor(), offset_ptr, cu))
+  if (!formValue.extractValue(u->getDebugInfoExtractor(), offset_ptr, u))
     return;
 
   OS << "\t(";
-  formValue.dump(OS, cu);
+  
+  const char *Name = nullptr;
+  std::string File;
+  if (attr == DW_AT_decl_file || attr == DW_AT_call_file) {
+    if (const auto *LT = u->getContext().getLineTableForUnit(u))
+      if (LT->getFileNameByIndex(
+             formValue.getAsUnsignedConstant().getValue(),
+             u->getCompilationDir(),
+             DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath, File)) {
+        File = '"' + File + '"';
+        Name = File.c_str();
+      }
+  } else if (Optional<uint64_t> Val = formValue.getAsUnsignedConstant())
+    Name = AttributeValueString(attr, *Val);
+
+  if (Name) {
+    OS << Name;
+  } else if (attr == DW_AT_decl_line || attr == DW_AT_call_line) {
+    OS << *formValue.getAsUnsignedConstant();
+  } else {
+    formValue.dump(OS, u);
+  }
+
+  // We have dumped the attribute raw value. For some attributes
+  // having both the raw value and the pretty-printed value is
+  // interesting. These attributes are handled below.
+  if ((attr == DW_AT_specification || attr == DW_AT_abstract_origin) &&
+      // The signature references aren't handled.
+      formValue.getForm() != DW_FORM_ref_sig8) {
+    uint32_t Ref = formValue.getAsReference(u).getValue();
+    DWARFDebugInfoEntryMinimal DIE;
+    if (const DWARFUnit *RefU = findUnitAndExtractFast(DIE, u, &Ref))
+      if (const char *Ref = DIE.getName(RefU, DINameKind::LinkageName))
+        OS << " \"" << Ref << '\"';
+  } else if (attr == DW_AT_APPLE_property_attribute) {
+    if (Optional<uint64_t> OptVal = formValue.getAsUnsignedConstant())
+      dumpApplePropertyAttribute(OS, *OptVal);
+  } else if (attr == DW_AT_ranges) {
+    dumpRanges(OS, getAddressRanges(u), u->getAddressByteSize(),
+               sizeof(BaseIndent)+indent+4);
+  }
+
   OS << ")\n";
 }
 
-bool DWARFDebugInfoEntryMinimal::extractFast(const DWARFCompileUnit *cu,
-                                             const uint8_t *fixed_form_sizes,
-                                             uint32_t *offset_ptr) {
-  Offset = *offset_ptr;
-
-  DataExtractor debug_info_data = cu->getDebugInfoExtractor();
-  uint64_t abbrCode = debug_info_data.getULEB128(offset_ptr);
-
-  assert (fixed_form_sizes); // For best performance this should be specified!
-
-  if (abbrCode) {
-    uint32_t offset = *offset_ptr;
-
-    AbbrevDecl = cu->getAbbreviations()->getAbbreviationDeclaration(abbrCode);
-
-    // Skip all data in the .debug_info for the attributes
-    const uint32_t numAttributes = AbbrevDecl->getNumAttributes();
-    uint32_t i;
-    uint16_t form;
-    for (i=0; i<numAttributes; ++i) {
-      form = AbbrevDecl->getFormByIndex(i);
-
-      const uint8_t fixed_skip_size = fixed_form_sizes[form];
-      if (fixed_skip_size)
-        offset += fixed_skip_size;
-      else {
-        bool form_is_indirect = false;
-        do {
-          form_is_indirect = false;
-          uint32_t form_size = 0;
-          switch (form) {
-          // Blocks if inlined data that have a length field and the data bytes
-          // inlined in the .debug_info.
-          case DW_FORM_block:
-            form_size = debug_info_data.getULEB128(&offset);
-            break;
-          case DW_FORM_block1:
-            form_size = debug_info_data.getU8(&offset);
-            break;
-          case DW_FORM_block2:
-            form_size = debug_info_data.getU16(&offset);
-            break;
-          case DW_FORM_block4:
-            form_size = debug_info_data.getU32(&offset);
-            break;
-
-          // Inlined NULL terminated C-strings
-          case DW_FORM_string:
-            debug_info_data.getCStr(&offset);
-            break;
-
-          // Compile unit address sized values
-          case DW_FORM_addr:
-          case DW_FORM_ref_addr:
-            form_size = cu->getAddressByteSize();
-            break;
-
-          // 1 byte values
-          case DW_FORM_data1:
-          case DW_FORM_flag:
-          case DW_FORM_ref1:
-            form_size = 1;
-            break;
-
-          // 2 byte values
-          case DW_FORM_data2:
-          case DW_FORM_ref2:
-            form_size = 2;
-            break;
-
-          // 4 byte values
-          case DW_FORM_strp:
-          case DW_FORM_data4:
-          case DW_FORM_ref4:
-            form_size = 4;
-            break;
-
-          // 8 byte values
-          case DW_FORM_data8:
-          case DW_FORM_ref8:
-            form_size = 8;
-            break;
-
-          // signed or unsigned LEB 128 values
-          case DW_FORM_sdata:
-          case DW_FORM_udata:
-          case DW_FORM_ref_udata:
-            debug_info_data.getULEB128(&offset);
-            break;
-
-          case DW_FORM_indirect:
-            form_is_indirect = true;
-            form = debug_info_data.getULEB128(&offset);
-            break;
-
-          default:
-            *offset_ptr = Offset;
-            return false;
-          }
-          offset += form_size;
-
-        } while (form_is_indirect);
-      }
-    }
-    *offset_ptr = offset;
+bool DWARFDebugInfoEntryMinimal::extractFast(const DWARFUnit *U,
+                                             uint32_t *OffsetPtr) {
+  Offset = *OffsetPtr;
+  DataExtractor DebugInfoData = U->getDebugInfoExtractor();
+  uint32_t UEndOffset = U->getNextUnitOffset();
+  if (Offset >= UEndOffset || !DebugInfoData.isValidOffset(Offset))
+    return false;
+  uint64_t AbbrCode = DebugInfoData.getULEB128(OffsetPtr);
+  if (0 == AbbrCode) {
+    // NULL debug tag entry.
+    AbbrevDecl = nullptr;
     return true;
-  } else {
-    AbbrevDecl = NULL;
-    return true; // NULL debug tag entry
   }
+  AbbrevDecl = U->getAbbreviations()->getAbbreviationDeclaration(AbbrCode);
+  if (nullptr == AbbrevDecl) {
+    // Restore the original offset.
+    *OffsetPtr = Offset;
+    return false;
+  }
+  ArrayRef<uint8_t> FixedFormSizes = DWARFFormValue::getFixedFormSizes(
+      U->getAddressByteSize(), U->getVersion());
+  assert(FixedFormSizes.size() > 0);
+
+  // Skip all data in the .debug_info for the attributes
+  for (const auto &AttrSpec : AbbrevDecl->attributes()) {
+    uint16_t Form = AttrSpec.Form;
+
+    uint8_t FixedFormSize =
+        (Form < FixedFormSizes.size()) ? FixedFormSizes[Form] : 0;
+    if (FixedFormSize)
+      *OffsetPtr += FixedFormSize;
+    else if (!DWARFFormValue::skipValue(Form, DebugInfoData, OffsetPtr, U)) {
+      // Restore the original offset.
+      *OffsetPtr = Offset;
+      return false;
+    }
+  }
+  return true;
+}
 
-  return false;
+bool DWARFDebugInfoEntryMinimal::isSubprogramDIE() const {
+  return getTag() == DW_TAG_subprogram;
+}
+
+bool DWARFDebugInfoEntryMinimal::isSubroutineDIE() const {
+  uint32_t Tag = getTag();
+  return Tag == DW_TAG_subprogram ||
+         Tag == DW_TAG_inlined_subroutine;
 }
 
-bool
-DWARFDebugInfoEntryMinimal::extract(const DWARFCompileUnit *cu,
-                                    uint32_t *offset_ptr) {
-  DataExtractor debug_info_data = cu->getDebugInfoExtractor();
-  const uint32_t cu_end_offset = cu->getNextCompileUnitOffset();
-  const uint8_t cu_addr_size = cu->getAddressByteSize();
-  uint32_t offset = *offset_ptr;
-  if ((offset < cu_end_offset) && debug_info_data.isValidOffset(offset)) {
-    Offset = offset;
+bool DWARFDebugInfoEntryMinimal::getAttributeValue(
+    const DWARFUnit *U, const uint16_t Attr, DWARFFormValue &FormValue) const {
+  if (!AbbrevDecl)
+    return false;
 
-    uint64_t abbrCode = debug_info_data.getULEB128(&offset);
+  uint32_t AttrIdx = AbbrevDecl->findAttributeIndex(Attr);
+  if (AttrIdx == -1U)
+    return false;
 
-    if (abbrCode) {
-      AbbrevDecl = cu->getAbbreviations()->getAbbreviationDeclaration(abbrCode);
+  DataExtractor DebugInfoData = U->getDebugInfoExtractor();
+  uint32_t DebugInfoOffset = getOffset();
 
-      if (AbbrevDecl) {
-        uint16_t tag = AbbrevDecl->getTag();
-
-        bool isCompileUnitTag = tag == DW_TAG_compile_unit;
-        if(cu && isCompileUnitTag)
-          const_cast<DWARFCompileUnit*>(cu)->setBaseAddress(0);
-
-        // Skip all data in the .debug_info for the attributes
-        const uint32_t numAttributes = AbbrevDecl->getNumAttributes();
-        for (uint32_t i = 0; i != numAttributes; ++i) {
-          uint16_t attr = AbbrevDecl->getAttrByIndex(i);
-          uint16_t form = AbbrevDecl->getFormByIndex(i);
-
-          if (isCompileUnitTag &&
-              ((attr == DW_AT_entry_pc) || (attr == DW_AT_low_pc))) {
-            DWARFFormValue form_value(form);
-            if (form_value.extractValue(debug_info_data, &offset, cu)) {
-              if (attr == DW_AT_low_pc || attr == DW_AT_entry_pc)
-                const_cast<DWARFCompileUnit*>(cu)
-                  ->setBaseAddress(form_value.getUnsigned());
-            }
-          } else {
-            bool form_is_indirect = false;
-            do {
-              form_is_indirect = false;
-              register uint32_t form_size = 0;
-              switch (form) {
-              // Blocks if inlined data that have a length field and the data
-              // bytes // inlined in the .debug_info
-              case DW_FORM_block:
-                form_size = debug_info_data.getULEB128(&offset);
-                break;
-              case DW_FORM_block1:
-                form_size = debug_info_data.getU8(&offset);
-                break;
-              case DW_FORM_block2:
-                form_size = debug_info_data.getU16(&offset);
-                break;
-              case DW_FORM_block4:
-                form_size = debug_info_data.getU32(&offset);
-                break;
-
-              // Inlined NULL terminated C-strings
-              case DW_FORM_string:
-                debug_info_data.getCStr(&offset);
-                break;
-
-              // Compile unit address sized values
-              case DW_FORM_addr:
-              case DW_FORM_ref_addr:
-                form_size = cu_addr_size;
-                break;
-
-              // 1 byte values
-              case DW_FORM_data1:
-              case DW_FORM_flag:
-              case DW_FORM_ref1:
-                form_size = 1;
-                break;
-
-              // 2 byte values
-              case DW_FORM_data2:
-              case DW_FORM_ref2:
-                form_size = 2;
-                break;
-
-                // 4 byte values
-              case DW_FORM_strp:
-                form_size = 4;
-                break;
-
-              case DW_FORM_data4:
-              case DW_FORM_ref4:
-                form_size = 4;
-                break;
-
-              // 8 byte values
-              case DW_FORM_data8:
-              case DW_FORM_ref8:
-                form_size = 8;
-                break;
-
-              // signed or unsigned LEB 128 values
-              case DW_FORM_sdata:
-              case DW_FORM_udata:
-              case DW_FORM_ref_udata:
-                debug_info_data.getULEB128(&offset);
-                break;
-
-              case DW_FORM_indirect:
-                form = debug_info_data.getULEB128(&offset);
-                form_is_indirect = true;
-                break;
-
-              default:
-                *offset_ptr = offset;
-                return false;
-              }
-
-              offset += form_size;
-            } while (form_is_indirect);
-          }
-        }
-        *offset_ptr = offset;
-        return true;
-      }
-    } else {
-      AbbrevDecl = NULL;
-      *offset_ptr = offset;
-      return true;    // NULL debug tag entry
-    }
+  // Skip the abbreviation code so we are at the data for the attributes
+  DebugInfoData.getULEB128(&DebugInfoOffset);
+
+  // Skip preceding attribute values.
+  for (uint32_t i = 0; i < AttrIdx; ++i) {
+    DWARFFormValue::skipValue(AbbrevDecl->getFormByIndex(i),
+                              DebugInfoData, &DebugInfoOffset, U);
   }
 
-  return false;
+  FormValue = DWARFFormValue(AbbrevDecl->getFormByIndex(AttrIdx));
+  return FormValue.extractValue(DebugInfoData, &DebugInfoOffset, U);
 }
 
-uint32_t
-DWARFDebugInfoEntryMinimal::getAttributeValue(const DWARFCompileUnit *cu,
-                                              const uint16_t attr,
-                                              DWARFFormValue &form_value,
-                                              uint32_t *end_attr_offset_ptr)
-                                              const {
-  if (AbbrevDecl) {
-    uint32_t attr_idx = AbbrevDecl->findAttributeIndex(attr);
-
-    if (attr_idx != -1U) {
-      uint32_t offset = getOffset();
-
-      DataExtractor debug_info_data = cu->getDebugInfoExtractor();
-
-      // Skip the abbreviation code so we are at the data for the attributes
-      debug_info_data.getULEB128(&offset);
-
-      uint32_t idx = 0;
-      while (idx < attr_idx)
-        DWARFFormValue::skipValue(AbbrevDecl->getFormByIndex(idx++),
-                                  debug_info_data, &offset, cu);
-
-      const uint32_t attr_offset = offset;
-      form_value = DWARFFormValue(AbbrevDecl->getFormByIndex(idx));
-      if (form_value.extractValue(debug_info_data, &offset, cu)) {
-        if (end_attr_offset_ptr)
-          *end_attr_offset_ptr = offset;
-        return attr_offset;
-      }
-    }
-  }
+const char *DWARFDebugInfoEntryMinimal::getAttributeValueAsString(
+    const DWARFUnit *U, const uint16_t Attr, const char *FailValue) const {
+  DWARFFormValue FormValue;
+  if (!getAttributeValue(U, Attr, FormValue))
+    return FailValue;
+  Optional<const char *> Result = FormValue.getAsCString(U);
+  return Result.hasValue() ? Result.getValue() : FailValue;
+}
 
-  return 0;
+uint64_t DWARFDebugInfoEntryMinimal::getAttributeValueAsAddress(
+    const DWARFUnit *U, const uint16_t Attr, uint64_t FailValue) const {
+  DWARFFormValue FormValue;
+  if (!getAttributeValue(U, Attr, FormValue))
+    return FailValue;
+  Optional<uint64_t> Result = FormValue.getAsAddress(U);
+  return Result.hasValue() ? Result.getValue() : FailValue;
 }
 
-const char*
-DWARFDebugInfoEntryMinimal::getAttributeValueAsString(
-    const DWARFCompileUnit* cu,
-    const uint16_t attr,
-    const char* fail_value) const {
-  DWARFFormValue form_value;
-  if (getAttributeValue(cu, attr, form_value)) {
-    DataExtractor stringExtractor(cu->getContext().getStringSection(),
-        false, 0);
-    return form_value.getAsCString(&stringExtractor);
-  }
-  return fail_value;
+uint64_t DWARFDebugInfoEntryMinimal::getAttributeValueAsUnsignedConstant(
+    const DWARFUnit *U, const uint16_t Attr, uint64_t FailValue) const {
+  DWARFFormValue FormValue;
+  if (!getAttributeValue(U, Attr, FormValue))
+    return FailValue;
+  Optional<uint64_t> Result = FormValue.getAsUnsignedConstant();
+  return Result.hasValue() ? Result.getValue() : FailValue;
 }
 
-uint64_t
-DWARFDebugInfoEntryMinimal::getAttributeValueAsUnsigned(
-    const DWARFCompileUnit* cu,
-    const uint16_t attr,
-    uint64_t fail_value) const {
-  DWARFFormValue form_value;
-  if (getAttributeValue(cu, attr, form_value))
-      return form_value.getUnsigned();
-  return fail_value;
+uint64_t DWARFDebugInfoEntryMinimal::getAttributeValueAsReference(
+    const DWARFUnit *U, const uint16_t Attr, uint64_t FailValue) const {
+  DWARFFormValue FormValue;
+  if (!getAttributeValue(U, Attr, FormValue))
+    return FailValue;
+  Optional<uint64_t> Result = FormValue.getAsReference(U);
+  return Result.hasValue() ? Result.getValue() : FailValue;
 }
 
-int64_t
-DWARFDebugInfoEntryMinimal::getAttributeValueAsSigned(
-    const DWARFCompileUnit* cu,
-    const uint16_t attr,
-    int64_t fail_value) const {
-  DWARFFormValue form_value;
-  if (getAttributeValue(cu, attr, form_value))
-      return form_value.getSigned();
-  return fail_value;
+uint64_t DWARFDebugInfoEntryMinimal::getAttributeValueAsSectionOffset(
+    const DWARFUnit *U, const uint16_t Attr, uint64_t FailValue) const {
+  DWARFFormValue FormValue;
+  if (!getAttributeValue(U, Attr, FormValue))
+    return FailValue;
+  Optional<uint64_t> Result = FormValue.getAsSectionOffset();
+  return Result.hasValue() ? Result.getValue() : FailValue;
 }
 
 uint64_t
-DWARFDebugInfoEntryMinimal::getAttributeValueAsReference(
-                                                  const DWARFCompileUnit* cu,
-                                                  const uint16_t attr,
-                                                  uint64_t fail_value) const {
-  DWARFFormValue form_value;
-  if (getAttributeValue(cu, attr, form_value))
-      return form_value.getReference(cu);
-  return fail_value;
+DWARFDebugInfoEntryMinimal::getRangesBaseAttribute(const DWARFUnit *U,
+                                                   uint64_t FailValue) const {
+  uint64_t Result =
+      getAttributeValueAsSectionOffset(U, DW_AT_ranges_base, -1ULL);
+  if (Result != -1ULL)
+    return Result;
+  return getAttributeValueAsSectionOffset(U, DW_AT_GNU_ranges_base, FailValue);
+}
+
+bool DWARFDebugInfoEntryMinimal::getLowAndHighPC(const DWARFUnit *U,
+                                                 uint64_t &LowPC,
+                                                 uint64_t &HighPC) const {
+  LowPC = getAttributeValueAsAddress(U, DW_AT_low_pc, -1ULL);
+  if (LowPC == -1ULL)
+    return false;
+  HighPC = getAttributeValueAsAddress(U, DW_AT_high_pc, -1ULL);
+  if (HighPC == -1ULL) {
+    // Since DWARF4, DW_AT_high_pc may also be of class constant, in which case
+    // it represents function size.
+    HighPC = getAttributeValueAsUnsignedConstant(U, DW_AT_high_pc, -1ULL);
+    if (HighPC != -1ULL)
+      HighPC += LowPC;
+  }
+  return (HighPC != -1ULL);
+}
+
+DWARFAddressRangesVector
+DWARFDebugInfoEntryMinimal::getAddressRanges(const DWARFUnit *U) const {
+  if (isNULL())
+    return DWARFAddressRangesVector();
+  // Single range specified by low/high PC.
+  uint64_t LowPC, HighPC;
+  if (getLowAndHighPC(U, LowPC, HighPC)) {
+    return DWARFAddressRangesVector(1, std::make_pair(LowPC, HighPC));
+  }
+  // Multiple ranges from .debug_ranges section.
+  uint32_t RangesOffset =
+      getAttributeValueAsSectionOffset(U, DW_AT_ranges, -1U);
+  if (RangesOffset != -1U) {
+    DWARFDebugRangeList RangeList;
+    if (U->extractRangeList(RangesOffset, RangeList))
+      return RangeList.getAbsoluteRanges(U->getBaseAddress());
+  }
+  return DWARFAddressRangesVector();
 }
 
-void
-DWARFDebugInfoEntryMinimal::buildAddressRangeTable(const DWARFCompileUnit *cu,
-                                               DWARFDebugAranges *debug_aranges)
-                                                   const {
-  if (AbbrevDecl) {
-    uint16_t tag = AbbrevDecl->getTag();
-    if (tag == DW_TAG_subprogram) {
-      uint64_t hi_pc = -1ULL;
-      uint64_t lo_pc = getAttributeValueAsUnsigned(cu, DW_AT_low_pc, -1ULL);
-      if (lo_pc != -1ULL)
-        hi_pc = getAttributeValueAsUnsigned(cu, DW_AT_high_pc, -1ULL);
-      if (hi_pc != -1ULL)
-        debug_aranges->appendRange(cu->getOffset(), lo_pc, hi_pc);
+void DWARFDebugInfoEntryMinimal::collectChildrenAddressRanges(
+    const DWARFUnit *U, DWARFAddressRangesVector& Ranges) const {
+  if (isNULL())
+    return;
+  if (isSubprogramDIE()) {
+    const auto &DIERanges = getAddressRanges(U);
+    Ranges.insert(Ranges.end(), DIERanges.begin(), DIERanges.end());
+  }
+
+  const DWARFDebugInfoEntryMinimal *Child = getFirstChild();
+  while (Child) {
+    Child->collectChildrenAddressRanges(U, Ranges);
+    Child = Child->getSibling();
+  }
+}
+
+bool DWARFDebugInfoEntryMinimal::addressRangeContainsAddress(
+    const DWARFUnit *U, const uint64_t Address) const {
+  for (const auto& R : getAddressRanges(U)) {
+    if (R.first <= Address && Address < R.second)
+      return true;
+  }
+  return false;
+}
+
+const char *
+DWARFDebugInfoEntryMinimal::getSubroutineName(const DWARFUnit *U,
+                                              DINameKind Kind) const {
+  if (!isSubroutineDIE())
+    return nullptr;
+  return getName(U, Kind);
+}
+
+const char *
+DWARFDebugInfoEntryMinimal::getName(const DWARFUnit *U,
+                                    DINameKind Kind) const {
+  if (Kind == DINameKind::None)
+    return nullptr;
+  // Try to get mangled name only if it was asked for.
+  if (Kind == DINameKind::LinkageName) {
+    if (const char *name =
+            getAttributeValueAsString(U, DW_AT_MIPS_linkage_name, nullptr))
+      return name;
+    if (const char *name =
+            getAttributeValueAsString(U, DW_AT_linkage_name, nullptr))
+      return name;
+  }
+  if (const char *name = getAttributeValueAsString(U, DW_AT_name, nullptr))
+    return name;
+  // Try to get name from specification DIE.
+  uint32_t spec_ref =
+      getAttributeValueAsReference(U, DW_AT_specification, -1U);
+  if (spec_ref != -1U) {
+    DWARFDebugInfoEntryMinimal spec_die;
+    if (const DWARFUnit *RefU = findUnitAndExtractFast(spec_die, U, &spec_ref)) {
+      if (const char *name = spec_die.getName(RefU, Kind))
+        return name;
     }
+  }
+  // Try to get name from abstract origin DIE.
+  uint32_t abs_origin_ref =
+      getAttributeValueAsReference(U, DW_AT_abstract_origin, -1U);
+  if (abs_origin_ref != -1U) {
+    DWARFDebugInfoEntryMinimal abs_origin_die;
+    if (const DWARFUnit *RefU = findUnitAndExtractFast(abs_origin_die, U,
+                                                       &abs_origin_ref)) {
+      if (const char *name = abs_origin_die.getName(RefU, Kind))
+        return name;
+    }
+  }
+  return nullptr;
+}
 
-    const DWARFDebugInfoEntryMinimal *child = getFirstChild();
-    while (child) {
-      child->buildAddressRangeTable(cu, debug_aranges);
-      child = child->getSibling();
+void DWARFDebugInfoEntryMinimal::getCallerFrame(const DWARFUnit *U,
+                                                uint32_t &CallFile,
+                                                uint32_t &CallLine,
+                                                uint32_t &CallColumn) const {
+  CallFile = getAttributeValueAsUnsignedConstant(U, DW_AT_call_file, 0);
+  CallLine = getAttributeValueAsUnsignedConstant(U, DW_AT_call_line, 0);
+  CallColumn = getAttributeValueAsUnsignedConstant(U, DW_AT_call_column, 0);
+}
+
+DWARFDebugInfoEntryInlinedChain
+DWARFDebugInfoEntryMinimal::getInlinedChainForAddress(
+    const DWARFUnit *U, const uint64_t Address) const {
+  DWARFDebugInfoEntryInlinedChain InlinedChain;
+  InlinedChain.U = U;
+  if (isNULL())
+    return InlinedChain;
+  for (const DWARFDebugInfoEntryMinimal *DIE = this; DIE; ) {
+    // Append current DIE to inlined chain only if it has correct tag
+    // (e.g. it is not a lexical block).
+    if (DIE->isSubroutineDIE()) {
+      InlinedChain.DIEs.push_back(*DIE);
+    }
+    // Try to get child which also contains provided address.
+    const DWARFDebugInfoEntryMinimal *Child = DIE->getFirstChild();
+    while (Child) {
+      if (Child->addressRangeContainsAddress(U, Address)) {
+        // Assume there is only one such child.
+        break;
+      }
+      Child = Child->getSibling();
     }
+    DIE = Child;
   }
+  // Reverse the obtained chain to make the root of inlined chain last.
+  std::reverse(InlinedChain.DIEs.begin(), InlinedChain.DIEs.end());
+  return InlinedChain;
 }