[llvm] 791efb1 - [ARM] Rewrite ARMAttributeParser

Fangrui Song via llvm-commits llvm-commits at lists.llvm.org
Thu Mar 5 11:01:57 PST 2020


Author: Fangrui Song
Date: 2020-03-05T10:57:27-08:00
New Revision: 791efb148f28e89a62413bcefd242911c6974ea6

URL: https://github.com/llvm/llvm-project/commit/791efb148f28e89a62413bcefd242911c6974ea6
DIFF: https://github.com/llvm/llvm-project/commit/791efb148f28e89a62413bcefd242911c6974ea6.diff

LOG: [ARM] Rewrite ARMAttributeParser

* Delete boilerplate
* Change functions to return `Error`
* Test parsing errors
* Update callers of ARMAttributeParser::parse() to check the `Error` return value.

Since this patch touches nearly everything in the file, I apply
http://llvm.org/docs/Proposals/VariableNames.html and change variable
names to lower case.

Reviewed By: compnerd

Differential Revision: https://reviews.llvm.org/D75015

Added: 
    

Modified: 
    lld/ELF/InputFiles.cpp
    lld/test/ELF/arm-tag-vfp-args-illegal.s
    lld/test/ELF/invalid/bad-arm-attributes.s
    llvm/include/llvm/Object/ELFObjectFile.h
    llvm/include/llvm/Support/ARMAttributeParser.h
    llvm/include/llvm/Support/DataExtractor.h
    llvm/lib/Object/ELFObjectFile.cpp
    llvm/lib/Support/ARMAttributeParser.cpp
    llvm/tools/llvm-readobj/ELFDumper.cpp
    llvm/unittests/Support/ARMAttributeParser.cpp

Removed: 
    lld/test/ELF/invalid/bad-arm-attributes2.s


################################################################################
diff  --git a/lld/ELF/InputFiles.cpp b/lld/ELF/InputFiles.cpp
index 4ec9abdcc090..f419b7b571d4 100644
--- a/lld/ELF/InputFiles.cpp
+++ b/lld/ELF/InputFiles.cpp
@@ -840,8 +840,13 @@ InputSectionBase *ObjFile<ELFT>::createInputSection(const Elf_Shdr &sec) {
       break;
     ARMAttributeParser attributes;
     ArrayRef<uint8_t> contents = check(this->getObj().getSectionContents(&sec));
-    attributes.parse(contents, config->ekind == ELF32LEKind ? support::little
-                                                            : support::big);
+    if (Error e = attributes.parse(contents, config->ekind == ELF32LEKind
+                                                 ? support::little
+                                                 : support::big)) {
+      auto *isec = make<InputSection>(*this, sec, name);
+      warn(toString(isec) + ": " + llvm::toString(std::move(e)));
+      break;
+    }
     updateSupportedARMFeatures(attributes);
     updateARMVFPArgs(attributes, this);
 

diff  --git a/lld/test/ELF/arm-tag-vfp-args-illegal.s b/lld/test/ELF/arm-tag-vfp-args-illegal.s
index b661d57b13b3..ce5a7d2bbf12 100644
--- a/lld/test/ELF/arm-tag-vfp-args-illegal.s
+++ b/lld/test/ELF/arm-tag-vfp-args-illegal.s
@@ -1,8 +1,8 @@
 // REQUIRES:arm
 // RUN: llvm-mc -filetype=obj -triple=armv7a-none-linux-gnueabi %s -o %t.o
-// RUN: not ld.lld %t.o -o /dev/null 2>&1 | FileCheck %s
+// RUN: ld.lld %t.o -o /dev/null 2>&1 | FileCheck %s
 
-// CHECK: arm-tag-vfp-args-illegal.s.tmp.o: unknown Tag_ABI_VFP_args value: 5
+// CHECK: {{.*}}.o:(.ARM.attributes): unknown ABI_VFP_args value: 5
         .arch armv7-a
         .eabi_attribute 20, 1
         .eabi_attribute 21, 1

diff  --git a/lld/test/ELF/invalid/bad-arm-attributes.s b/lld/test/ELF/invalid/bad-arm-attributes.s
index be9eb8df881a..f200ddb90ad8 100644
--- a/lld/test/ELF/invalid/bad-arm-attributes.s
+++ b/lld/test/ELF/invalid/bad-arm-attributes.s
@@ -1,8 +1,8 @@
 # REQUIRES: arm
-# RUN: llvm-mc -filetype=obj -triple=arm-unknown-linux %s -o %t
-# RUN: ld.lld %t -o /dev/null 2>&1 | FileCheck %s
+# RUN: llvm-mc -filetype=obj -triple=arm-unknown-linux %s -o %t.o
+# RUN: ld.lld %t.o -o /dev/null 2>&1 | FileCheck %s
 
-# CHECK: invalid subsection length 0 at offset 1
+# CHECK: {{.*}}.o:(.ARM.attributes): unrecognized format-version: 0x0
 
 .section .ARM.attributes,"a",%0x70000003
   .quad 0

diff  --git a/lld/test/ELF/invalid/bad-arm-attributes2.s b/lld/test/ELF/invalid/bad-arm-attributes2.s
deleted file mode 100644
index 3b3d092202e5..000000000000
--- a/lld/test/ELF/invalid/bad-arm-attributes2.s
+++ /dev/null
@@ -1,8 +0,0 @@
-# REQUIRES: arm
-# RUN: llvm-mc -filetype=obj -triple=arm-unknown-linux %s -o %t
-# RUN: ld.lld %t -o /dev/null 2>&1 | FileCheck %s
-
-# CHECK: invalid subsection length 4294967295 at offset 1
-
-.section .ARM.attributes,"a",%0x70000003
-  .byte 0, 0xFF, 0xFF, 0xFF, 0xFF

diff  --git a/llvm/include/llvm/Object/ELFObjectFile.h b/llvm/include/llvm/Object/ELFObjectFile.h
index 7effce6ab6c7..59b99d088921 100644
--- a/llvm/include/llvm/Object/ELFObjectFile.h
+++ b/llvm/include/llvm/Object/ELFObjectFile.h
@@ -380,7 +380,8 @@ template <class ELFT> class ELFObjectFile : public ELFObjectFileBase {
         if (Contents[0] != ARMBuildAttrs::Format_Version || Contents.size() == 1)
           return Error::success();
 
-        Attributes.parse(Contents, ELFT::TargetEndianness);
+        if (Error E = Attributes.parse(Contents, ELFT::TargetEndianness))
+          return E;
         break;
       }
     }

diff  --git a/llvm/include/llvm/Support/ARMAttributeParser.h b/llvm/include/llvm/Support/ARMAttributeParser.h
index df7417f7a383..c0f86ecd8b6a 100644
--- a/llvm/include/llvm/Support/ARMAttributeParser.h
+++ b/llvm/include/llvm/Support/ARMAttributeParser.h
@@ -11,7 +11,10 @@
 
 #include "ARMBuildAttributes.h"
 #include "ScopedPrinter.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/Support/DataExtractor.h"
 #include "llvm/Support/Endian.h"
+#include "llvm/Support/Error.h"
 
 #include <map>
 
@@ -19,120 +22,76 @@ namespace llvm {
 class StringRef;
 
 class ARMAttributeParser {
-  ScopedPrinter *SW;
+  ScopedPrinter *sw;
 
-  std::map<unsigned, unsigned> Attributes;
+  std::map<unsigned, unsigned> attributes;
+  DataExtractor de{ArrayRef<uint8_t>{}, true, 0};
+  DataExtractor::Cursor cursor{0};
 
   struct DisplayHandler {
-    ARMBuildAttrs::AttrType Attribute;
-    void (ARMAttributeParser::*Routine)(ARMBuildAttrs::AttrType,
-                                        const uint8_t *, uint32_t &);
+    ARMBuildAttrs::AttrType attribute;
+    Error (ARMAttributeParser::*routine)(ARMBuildAttrs::AttrType);
   };
-  static const DisplayHandler DisplayRoutines[];
-
-  uint64_t ParseInteger(const uint8_t *Data, uint32_t &Offset);
-  StringRef ParseString(const uint8_t *Data, uint32_t &Offset);
-
-  void IntegerAttribute(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                        uint32_t &Offset);
-  void StringAttribute(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                       uint32_t &Offset);
-
-  void PrintAttribute(unsigned Tag, unsigned Value, StringRef ValueDesc);
-
-  void CPU_arch(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                uint32_t &Offset);
-  void CPU_arch_profile(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                        uint32_t &Offset);
-  void ARM_ISA_use(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                   uint32_t &Offset);
-  void THUMB_ISA_use(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                     uint32_t &Offset);
-  void FP_arch(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-               uint32_t &Offset);
-  void WMMX_arch(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                 uint32_t &Offset);
-  void Advanced_SIMD_arch(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                          uint32_t &Offset);
-  void MVE_arch(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                uint32_t &Offset);
-  void PCS_config(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                  uint32_t &Offset);
-  void ABI_PCS_R9_use(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                      uint32_t &Offset);
-  void ABI_PCS_RW_data(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                       uint32_t &Offset);
-  void ABI_PCS_RO_data(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                       uint32_t &Offset);
-  void ABI_PCS_GOT_use(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                       uint32_t &Offset);
-  void ABI_PCS_wchar_t(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                       uint32_t &Offset);
-  void ABI_FP_rounding(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                       uint32_t &Offset);
-  void ABI_FP_denormal(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                       uint32_t &Offset);
-  void ABI_FP_exceptions(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                         uint32_t &Offset);
-  void ABI_FP_user_exceptions(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                              uint32_t &Offset);
-  void ABI_FP_number_model(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                           uint32_t &Offset);
-  void ABI_align_needed(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                        uint32_t &Offset);
-  void ABI_align_preserved(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                           uint32_t &Offset);
-  void ABI_enum_size(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                     uint32_t &Offset);
-  void ABI_HardFP_use(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                      uint32_t &Offset);
-  void ABI_VFP_args(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                    uint32_t &Offset);
-  void ABI_WMMX_args(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                     uint32_t &Offset);
-  void ABI_optimization_goals(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                              uint32_t &Offset);
-  void ABI_FP_optimization_goals(ARMBuildAttrs::AttrType Tag,
-                                 const uint8_t *Data, uint32_t &Offset);
-  void compatibility(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                     uint32_t &Offset);
-  void CPU_unaligned_access(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                            uint32_t &Offset);
-  void FP_HP_extension(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                       uint32_t &Offset);
-  void ABI_FP_16bit_format(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                           uint32_t &Offset);
-  void MPextension_use(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                       uint32_t &Offset);
-  void DIV_use(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-               uint32_t &Offset);
-  void DSP_extension(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                     uint32_t &Offset);
-  void T2EE_use(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                uint32_t &Offset);
-  void Virtualization_use(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                          uint32_t &Offset);
-  void nodefaults(ARMBuildAttrs::AttrType Tag, const uint8_t *Data,
-                  uint32_t &Offset);
-
-  void ParseAttributeList(const uint8_t *Data, uint32_t &Offset,
-                          uint32_t Length);
-  void ParseIndexList(const uint8_t *Data, uint32_t &Offset,
-                      SmallVectorImpl<uint8_t> &IndexList);
-  void ParseSubsection(const uint8_t *Data, uint32_t Length);
-public:
-  ARMAttributeParser(ScopedPrinter *SW) : SW(SW) {}
+  static const DisplayHandler displayRoutines[];
+
+  Error parseAttributeList(uint32_t length);
+  void parseIndexList(SmallVectorImpl<uint8_t> &indexList);
+  Error parseSubsection(uint32_t length);
+  Error parseStringAttribute(const char *name, ARMBuildAttrs::AttrType tag,
+                             const ArrayRef<const char *> array);
+  void printAttribute(unsigned tag, unsigned value, StringRef valueDesc);
+
+  Error stringAttribute(ARMBuildAttrs::AttrType tag);
+
+  Error CPU_arch(ARMBuildAttrs::AttrType tag);
+  Error CPU_arch_profile(ARMBuildAttrs::AttrType tag);
+  Error ARM_ISA_use(ARMBuildAttrs::AttrType tag);
+  Error THUMB_ISA_use(ARMBuildAttrs::AttrType tag);
+  Error FP_arch(ARMBuildAttrs::AttrType tag);
+  Error WMMX_arch(ARMBuildAttrs::AttrType tag);
+  Error Advanced_SIMD_arch(ARMBuildAttrs::AttrType tag);
+  Error MVE_arch(ARMBuildAttrs::AttrType tag);
+  Error PCS_config(ARMBuildAttrs::AttrType tag);
+  Error ABI_PCS_R9_use(ARMBuildAttrs::AttrType tag);
+  Error ABI_PCS_RW_data(ARMBuildAttrs::AttrType tag);
+  Error ABI_PCS_RO_data(ARMBuildAttrs::AttrType tag);
+  Error ABI_PCS_GOT_use(ARMBuildAttrs::AttrType tag);
+  Error ABI_PCS_wchar_t(ARMBuildAttrs::AttrType tag);
+  Error ABI_FP_rounding(ARMBuildAttrs::AttrType tag);
+  Error ABI_FP_denormal(ARMBuildAttrs::AttrType tag);
+  Error ABI_FP_exceptions(ARMBuildAttrs::AttrType tag);
+  Error ABI_FP_user_exceptions(ARMBuildAttrs::AttrType tag);
+  Error ABI_FP_number_model(ARMBuildAttrs::AttrType tag);
+  Error ABI_align_needed(ARMBuildAttrs::AttrType tag);
+  Error ABI_align_preserved(ARMBuildAttrs::AttrType tag);
+  Error ABI_enum_size(ARMBuildAttrs::AttrType tag);
+  Error ABI_HardFP_use(ARMBuildAttrs::AttrType tag);
+  Error ABI_VFP_args(ARMBuildAttrs::AttrType tag);
+  Error ABI_WMMX_args(ARMBuildAttrs::AttrType tag);
+  Error ABI_optimization_goals(ARMBuildAttrs::AttrType tag);
+  Error ABI_FP_optimization_goals(ARMBuildAttrs::AttrType tag);
+  Error compatibility(ARMBuildAttrs::AttrType tag);
+  Error CPU_unaligned_access(ARMBuildAttrs::AttrType tag);
+  Error FP_HP_extension(ARMBuildAttrs::AttrType tag);
+  Error ABI_FP_16bit_format(ARMBuildAttrs::AttrType tag);
+  Error MPextension_use(ARMBuildAttrs::AttrType tag);
+  Error DIV_use(ARMBuildAttrs::AttrType tag);
+  Error DSP_extension(ARMBuildAttrs::AttrType tag);
+  Error T2EE_use(ARMBuildAttrs::AttrType tag);
+  Error Virtualization_use(ARMBuildAttrs::AttrType tag);
+  Error nodefaults(ARMBuildAttrs::AttrType tag);
 
-  ARMAttributeParser() : SW(nullptr) { }
+public:
+  ARMAttributeParser(ScopedPrinter *sw) : sw(sw) {}
+  ARMAttributeParser() : sw(nullptr) {}
+  ~ARMAttributeParser() { static_cast<void>(!cursor.takeError()); }
 
-  void parse(ArrayRef<uint8_t> Section, support::endianness E);
+  Error parse(ArrayRef<uint8_t> section, support::endianness endian);
 
-  bool hasAttribute(unsigned Tag) const {
-    return Attributes.count(Tag);
-  }
+  bool hasAttribute(unsigned tag) const { return attributes.count(tag); }
 
-  unsigned getAttributeValue(unsigned Tag) const {
-    return Attributes.find(Tag)->second;
+  unsigned getAttributeValue(unsigned tag) const {
+    return attributes.find(tag)->second;
   }
 };
 

diff  --git a/llvm/include/llvm/Support/DataExtractor.h b/llvm/include/llvm/Support/DataExtractor.h
index 164e5e8dcdd8..48c596d5e8b2 100644
--- a/llvm/include/llvm/Support/DataExtractor.h
+++ b/llvm/include/llvm/Support/DataExtractor.h
@@ -197,6 +197,8 @@ class DataExtractor {
   ///     is out of bounds, a default-initialized StringRef will be returned.
   StringRef getBytes(uint64_t *OffsetPtr, uint64_t Length) const;
 
+  StringRef getCStrRef(Cursor &C) const { return getCStrRef(&C.Offset); }
+
   /// Extract an unsigned integer of size \a byte_size from \a
   /// *offset_ptr.
   ///

diff  --git a/llvm/lib/Object/ELFObjectFile.cpp b/llvm/lib/Object/ELFObjectFile.cpp
index bf6ffd6c37b9..855e032417fd 100644
--- a/llvm/lib/Object/ELFObjectFile.cpp
+++ b/llvm/lib/Object/ELFObjectFile.cpp
@@ -157,8 +157,10 @@ SubtargetFeatures ELFObjectFileBase::getMIPSFeatures() const {
 SubtargetFeatures ELFObjectFileBase::getARMFeatures() const {
   SubtargetFeatures Features;
   ARMAttributeParser Attributes;
-  if (Error E = getBuildAttributes(Attributes))
+  if (Error E = getBuildAttributes(Attributes)) {
+    consumeError(std::move(E));
     return SubtargetFeatures();
+  }
 
   // both ARMv7-M and R have to support thumb hardware div
   bool isV7 = false;
@@ -305,8 +307,11 @@ void ELFObjectFileBase::setARMSubArch(Triple &TheTriple) const {
     return;
 
   ARMAttributeParser Attributes;
-  if (Error E = getBuildAttributes(Attributes))
+  if (Error E = getBuildAttributes(Attributes)) {
+    // TODO Propagate Error.
+    consumeError(std::move(E));
     return;
+  }
 
   std::string Triple;
   // Default to ARM, but use the triple if it's been set.

diff  --git a/llvm/lib/Support/ARMAttributeParser.cpp b/llvm/lib/Support/ARMAttributeParser.cpp
index 812b160c2e33..c7b8abe7ad2d 100644
--- a/llvm/lib/Support/ARMAttributeParser.cpp
+++ b/llvm/lib/Support/ARMAttributeParser.cpp
@@ -9,719 +9,547 @@
 #include "llvm/Support/ARMAttributeParser.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/Errc.h"
 #include "llvm/Support/LEB128.h"
 #include "llvm/Support/ScopedPrinter.h"
 
 using namespace llvm;
 using namespace llvm::ARMBuildAttrs;
 
-
-static const EnumEntry<unsigned> TagNames[] = {
-  { "Tag_File", ARMBuildAttrs::File },
-  { "Tag_Section", ARMBuildAttrs::Section },
-  { "Tag_Symbol", ARMBuildAttrs::Symbol },
+static const EnumEntry<unsigned> tagNames[] = {
+    {"Tag_File", ARMBuildAttrs::File},
+    {"Tag_Section", ARMBuildAttrs::Section},
+    {"Tag_Symbol", ARMBuildAttrs::Symbol},
 };
 
-namespace llvm {
-#define ATTRIBUTE_HANDLER(Attr_)                                                \
-  { ARMBuildAttrs::Attr_, &ARMAttributeParser::Attr_ }
-
-const ARMAttributeParser::DisplayHandler
-ARMAttributeParser::DisplayRoutines[] = {
-  { ARMBuildAttrs::CPU_raw_name, &ARMAttributeParser::StringAttribute, },
-  { ARMBuildAttrs::CPU_name, &ARMAttributeParser::StringAttribute },
-  ATTRIBUTE_HANDLER(CPU_arch),
-  ATTRIBUTE_HANDLER(CPU_arch_profile),
-  ATTRIBUTE_HANDLER(ARM_ISA_use),
-  ATTRIBUTE_HANDLER(THUMB_ISA_use),
-  ATTRIBUTE_HANDLER(FP_arch),
-  ATTRIBUTE_HANDLER(WMMX_arch),
-  ATTRIBUTE_HANDLER(Advanced_SIMD_arch),
-  ATTRIBUTE_HANDLER(MVE_arch),
-  ATTRIBUTE_HANDLER(PCS_config),
-  ATTRIBUTE_HANDLER(ABI_PCS_R9_use),
-  ATTRIBUTE_HANDLER(ABI_PCS_RW_data),
-  ATTRIBUTE_HANDLER(ABI_PCS_RO_data),
-  ATTRIBUTE_HANDLER(ABI_PCS_GOT_use),
-  ATTRIBUTE_HANDLER(ABI_PCS_wchar_t),
-  ATTRIBUTE_HANDLER(ABI_FP_rounding),
-  ATTRIBUTE_HANDLER(ABI_FP_denormal),
-  ATTRIBUTE_HANDLER(ABI_FP_exceptions),
-  ATTRIBUTE_HANDLER(ABI_FP_user_exceptions),
-  ATTRIBUTE_HANDLER(ABI_FP_number_model),
-  ATTRIBUTE_HANDLER(ABI_align_needed),
-  ATTRIBUTE_HANDLER(ABI_align_preserved),
-  ATTRIBUTE_HANDLER(ABI_enum_size),
-  ATTRIBUTE_HANDLER(ABI_HardFP_use),
-  ATTRIBUTE_HANDLER(ABI_VFP_args),
-  ATTRIBUTE_HANDLER(ABI_WMMX_args),
-  ATTRIBUTE_HANDLER(ABI_optimization_goals),
-  ATTRIBUTE_HANDLER(ABI_FP_optimization_goals),
-  ATTRIBUTE_HANDLER(compatibility),
-  ATTRIBUTE_HANDLER(CPU_unaligned_access),
-  ATTRIBUTE_HANDLER(FP_HP_extension),
-  ATTRIBUTE_HANDLER(ABI_FP_16bit_format),
-  ATTRIBUTE_HANDLER(MPextension_use),
-  ATTRIBUTE_HANDLER(DIV_use),
-  ATTRIBUTE_HANDLER(DSP_extension),
-  ATTRIBUTE_HANDLER(T2EE_use),
-  ATTRIBUTE_HANDLER(Virtualization_use),
-  ATTRIBUTE_HANDLER(nodefaults)
+#define ATTRIBUTE_HANDLER(attr)                                                \
+  { ARMBuildAttrs::attr, &ARMAttributeParser::attr }
+
+const ARMAttributeParser::DisplayHandler ARMAttributeParser::displayRoutines[] =
+    {
+        {ARMBuildAttrs::CPU_raw_name, &ARMAttributeParser::stringAttribute},
+        {ARMBuildAttrs::CPU_name, &ARMAttributeParser::stringAttribute},
+        ATTRIBUTE_HANDLER(CPU_arch),
+        ATTRIBUTE_HANDLER(CPU_arch_profile),
+        ATTRIBUTE_HANDLER(ARM_ISA_use),
+        ATTRIBUTE_HANDLER(THUMB_ISA_use),
+        ATTRIBUTE_HANDLER(FP_arch),
+        ATTRIBUTE_HANDLER(WMMX_arch),
+        ATTRIBUTE_HANDLER(Advanced_SIMD_arch),
+        ATTRIBUTE_HANDLER(MVE_arch),
+        ATTRIBUTE_HANDLER(PCS_config),
+        ATTRIBUTE_HANDLER(ABI_PCS_R9_use),
+        ATTRIBUTE_HANDLER(ABI_PCS_RW_data),
+        ATTRIBUTE_HANDLER(ABI_PCS_RO_data),
+        ATTRIBUTE_HANDLER(ABI_PCS_GOT_use),
+        ATTRIBUTE_HANDLER(ABI_PCS_wchar_t),
+        ATTRIBUTE_HANDLER(ABI_FP_rounding),
+        ATTRIBUTE_HANDLER(ABI_FP_denormal),
+        ATTRIBUTE_HANDLER(ABI_FP_exceptions),
+        ATTRIBUTE_HANDLER(ABI_FP_user_exceptions),
+        ATTRIBUTE_HANDLER(ABI_FP_number_model),
+        ATTRIBUTE_HANDLER(ABI_align_needed),
+        ATTRIBUTE_HANDLER(ABI_align_preserved),
+        ATTRIBUTE_HANDLER(ABI_enum_size),
+        ATTRIBUTE_HANDLER(ABI_HardFP_use),
+        ATTRIBUTE_HANDLER(ABI_VFP_args),
+        ATTRIBUTE_HANDLER(ABI_WMMX_args),
+        ATTRIBUTE_HANDLER(ABI_optimization_goals),
+        ATTRIBUTE_HANDLER(ABI_FP_optimization_goals),
+        ATTRIBUTE_HANDLER(compatibility),
+        ATTRIBUTE_HANDLER(CPU_unaligned_access),
+        ATTRIBUTE_HANDLER(FP_HP_extension),
+        ATTRIBUTE_HANDLER(ABI_FP_16bit_format),
+        ATTRIBUTE_HANDLER(MPextension_use),
+        ATTRIBUTE_HANDLER(DIV_use),
+        ATTRIBUTE_HANDLER(DSP_extension),
+        ATTRIBUTE_HANDLER(T2EE_use),
+        ATTRIBUTE_HANDLER(Virtualization_use),
+        ATTRIBUTE_HANDLER(nodefaults),
 };
 
 #undef ATTRIBUTE_HANDLER
 
-uint64_t ARMAttributeParser::ParseInteger(const uint8_t *Data,
-                                          uint32_t &Offset) {
-  unsigned DecodeLength;
-  uint64_t Value = decodeULEB128(Data + Offset, &DecodeLength);
-  Offset += DecodeLength;
-  return Value;
-}
-
-StringRef ARMAttributeParser::ParseString(const uint8_t *Data,
-                                          uint32_t &Offset) {
-  const char *String = reinterpret_cast<const char*>(Data + Offset);
-  size_t Length = std::strlen(String);
-  Offset = Offset + Length + 1;
-  return StringRef(String, Length);
-}
-
-void ARMAttributeParser::IntegerAttribute(AttrType Tag, const uint8_t *Data,
-                                          uint32_t &Offset) {
+Error ARMAttributeParser::stringAttribute(AttrType tag) {
+  StringRef tagName = ARMBuildAttrs::AttrTypeAsString(tag, /*TagPrefix=*/false);
+  StringRef desc = de.getCStrRef(cursor);
 
-  uint64_t Value = ParseInteger(Data, Offset);
-  Attributes.insert(std::make_pair(Tag, Value));
-
-  if (SW)
-    SW->printNumber(ARMBuildAttrs::AttrTypeAsString(Tag), Value);
-}
-
-void ARMAttributeParser::StringAttribute(AttrType Tag, const uint8_t *Data,
-                                         uint32_t &Offset) {
-  StringRef TagName = ARMBuildAttrs::AttrTypeAsString(Tag, /*TagPrefix*/false);
-  StringRef ValueDesc = ParseString(Data, Offset);
-
-  if (SW) {
-    DictScope AS(*SW, "Attribute");
-    SW->printNumber("Tag", Tag);
-    if (!TagName.empty())
-      SW->printString("TagName", TagName);
-    SW->printString("Value", ValueDesc);
+  if (sw) {
+    DictScope scope(*sw, "Attribute");
+    sw->printNumber("Tag", tag);
+    if (!tagName.empty())
+      sw->printString("TagName", tagName);
+    sw->printString("Value", desc);
+  }
+  return Error::success();
+}
+
+void ARMAttributeParser::printAttribute(unsigned tag, unsigned value,
+                                        StringRef valueDesc) {
+  attributes.insert(std::make_pair(tag, value));
+
+  if (sw) {
+    StringRef tagName =
+        ARMBuildAttrs::AttrTypeAsString(tag, /*TagPrefix=*/false);
+    DictScope as(*sw, "Attribute");
+    sw->printNumber("Tag", tag);
+    sw->printNumber("Value", value);
+    if (!tagName.empty())
+      sw->printString("TagName", tagName);
+    if (!valueDesc.empty())
+      sw->printString("Description", valueDesc);
   }
 }
 
-void ARMAttributeParser::PrintAttribute(unsigned Tag, unsigned Value,
-                                        StringRef ValueDesc) {
-  Attributes.insert(std::make_pair(Tag, Value));
-
-  if (SW) {
-    StringRef TagName = ARMBuildAttrs::AttrTypeAsString(Tag,
-                                                        /*TagPrefix*/false);
-    DictScope AS(*SW, "Attribute");
-    SW->printNumber("Tag", Tag);
-    SW->printNumber("Value", Value);
-    if (!TagName.empty())
-      SW->printString("TagName", TagName);
-    if (!ValueDesc.empty())
-      SW->printString("Description", ValueDesc);
+Error ARMAttributeParser::parseStringAttribute(const char *name, AttrType tag,
+                                               ArrayRef<const char *> strings) {
+  uint64_t value = de.getULEB128(cursor);
+  if (value >= strings.size()) {
+    printAttribute(tag, value, "");
+    return createStringError(errc::invalid_argument,
+                             "unknown " + Twine(name) +
+                                 " value: " + Twine(value));
   }
+  printAttribute(tag, value, strings[value]);
+  return Error::success();
 }
 
-void ARMAttributeParser::CPU_arch(AttrType Tag, const uint8_t *Data,
-                                  uint32_t &Offset) {
-  static const char *const Strings[] = {
+Error ARMAttributeParser::CPU_arch(AttrType tag) {
+  static const char *strings[] = {
     "Pre-v4", "ARM v4", "ARM v4T", "ARM v5T", "ARM v5TE", "ARM v5TEJ", "ARM v6",
     "ARM v6KZ", "ARM v6T2", "ARM v6K", "ARM v7", "ARM v6-M", "ARM v6S-M",
     "ARM v7E-M", "ARM v8", nullptr,
     "ARM v8-M Baseline", "ARM v8-M Mainline", nullptr, nullptr, nullptr,
     "ARM v8.1-M Mainline"
   };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+  return parseStringAttribute("CPU_arch", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::CPU_arch_profile(AttrType Tag, const uint8_t *Data,
-                                          uint32_t &Offset) {
-  uint64_t Encoded = ParseInteger(Data, Offset);
+Error ARMAttributeParser::CPU_arch_profile(AttrType tag) {
+  uint64_t value = de.getULEB128(cursor);
 
-  StringRef Profile;
-  switch (Encoded) {
-  default:  Profile = "Unknown"; break;
-  case 'A': Profile = "Application"; break;
-  case 'R': Profile = "Real-time"; break;
-  case 'M': Profile = "Microcontroller"; break;
-  case 'S': Profile = "Classic"; break;
-  case 0: Profile = "None"; break;
+  StringRef profile;
+  switch (value) {
+  default: profile = "Unknown"; break;
+  case 'A': profile = "Application"; break;
+  case 'R': profile = "Real-time"; break;
+  case 'M': profile = "Microcontroller"; break;
+  case 'S': profile = "Classic"; break;
+  case 0: profile = "None"; break;
   }
 
-  PrintAttribute(Tag, Encoded, Profile);
+  printAttribute(tag, value, profile);
+  return Error::success();
 }
 
-void ARMAttributeParser::ARM_ISA_use(AttrType Tag, const uint8_t *Data,
-                                     uint32_t &Offset) {
-  static const char *const Strings[] = { "Not Permitted", "Permitted" };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::ARM_ISA_use(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "Permitted"};
+  return parseStringAttribute("ARM_ISA_use", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::THUMB_ISA_use(AttrType Tag, const uint8_t *Data,
-                                       uint32_t &Offset) {
-  static const char *const Strings[] = { "Not Permitted", "Thumb-1", "Thumb-2" };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::THUMB_ISA_use(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "Thumb-1", "Thumb-2"};
+  return parseStringAttribute("THUMB_ISA_use", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::FP_arch(AttrType Tag, const uint8_t *Data,
-                                 uint32_t &Offset) {
-  static const char *const Strings[] = {
-    "Not Permitted", "VFPv1", "VFPv2", "VFPv3", "VFPv3-D16", "VFPv4",
-    "VFPv4-D16", "ARMv8-a FP", "ARMv8-a FP-D16"
-  };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::FP_arch(AttrType tag) {
+  static const char *strings[] = {
+      "Not Permitted", "VFPv1",     "VFPv2",      "VFPv3",         "VFPv3-D16",
+      "VFPv4",         "VFPv4-D16", "ARMv8-a FP", "ARMv8-a FP-D16"};
+  return parseStringAttribute("FP_arch", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::WMMX_arch(AttrType Tag, const uint8_t *Data,
-                                   uint32_t &Offset) {
-  static const char *const Strings[] = { "Not Permitted", "WMMXv1", "WMMXv2" };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::WMMX_arch(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "WMMXv1", "WMMXv2"};
+  return parseStringAttribute("WMMX_arch", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::Advanced_SIMD_arch(AttrType Tag, const uint8_t *Data,
-                                            uint32_t &Offset) {
-  static const char *const Strings[] = {
-    "Not Permitted", "NEONv1", "NEONv2+FMA", "ARMv8-a NEON", "ARMv8.1-a NEON"
-  };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::Advanced_SIMD_arch(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "NEONv1", "NEONv2+FMA",
+                                  "ARMv8-a NEON", "ARMv8.1-a NEON"};
+  return parseStringAttribute("Advanced_SIMD_arch", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::MVE_arch(AttrType Tag, const uint8_t *Data,
-                                  uint32_t &Offset) {
-  static const char *const Strings[] = {
-    "Not Permitted", "MVE integer", "MVE integer and float"
-  };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::MVE_arch(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "MVE integer",
+                                  "MVE integer and float"};
+  return parseStringAttribute("MVE_arch", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::PCS_config(AttrType Tag, const uint8_t *Data,
-                                    uint32_t &Offset) {
-  static const char *const Strings[] = {
+Error ARMAttributeParser::PCS_config(AttrType tag) {
+  static const char *strings[] = {
     "None", "Bare Platform", "Linux Application", "Linux DSO", "Palm OS 2004",
-    "Reserved (Palm OS)", "Symbian OS 2004", "Reserved (Symbian OS)"
-  };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+    "Reserved (Palm OS)", "Symbian OS 2004", "Reserved (Symbian OS)"};
+  return parseStringAttribute("PCS_config", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::ABI_PCS_R9_use(AttrType Tag, const uint8_t *Data,
-                                        uint32_t &Offset) {
-  static const char *const Strings[] = { "v6", "Static Base", "TLS", "Unused" };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::ABI_PCS_R9_use(AttrType tag) {
+  static const char *strings[] = {"v6", "Static Base", "TLS", "Unused"};
+  return parseStringAttribute("ABI_PCS_R9_use", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::ABI_PCS_RW_data(AttrType Tag, const uint8_t *Data,
-                                         uint32_t &Offset) {
-  static const char *const Strings[] = {
-    "Absolute", "PC-relative", "SB-relative", "Not Permitted"
-  };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::ABI_PCS_RW_data(AttrType tag) {
+  static const char *strings[] = {"Absolute", "PC-relative", "SB-relative",
+                                  "Not Permitted"};
+  return parseStringAttribute("ABI_PCS_RW_data", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::ABI_PCS_RO_data(AttrType Tag, const uint8_t *Data,
-                                         uint32_t &Offset) {
-  static const char *const Strings[] = {
-    "Absolute", "PC-relative", "Not Permitted"
-  };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::ABI_PCS_RO_data(AttrType tag) {
+  static const char *strings[] = {"Absolute", "PC-relative", "Not Permitted"};
+  return parseStringAttribute("ABI_PCS_RO_data", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::ABI_PCS_GOT_use(AttrType Tag, const uint8_t *Data,
-                                         uint32_t &Offset) {
-  static const char *const Strings[] = {
-    "Not Permitted", "Direct", "GOT-Indirect"
-  };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::ABI_PCS_GOT_use(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "Direct", "GOT-Indirect"};
+  return parseStringAttribute("ABI_PCS_GOT_use", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::ABI_PCS_wchar_t(AttrType Tag, const uint8_t *Data,
-                                         uint32_t &Offset) {
-  static const char *const Strings[] = {
-    "Not Permitted", "Unknown", "2-byte", "Unknown", "4-byte"
-  };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::ABI_PCS_wchar_t(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "Unknown", "2-byte",
+                                  "Unknown", "4-byte"};
+  return parseStringAttribute("ABI_PCS_wchar_t", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::ABI_FP_rounding(AttrType Tag, const uint8_t *Data,
-                                         uint32_t &Offset) {
-  static const char *const Strings[] = { "IEEE-754", "Runtime" };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::ABI_FP_rounding(AttrType tag) {
+  static const char *strings[] = {"IEEE-754", "Runtime"};
+  return parseStringAttribute("ABI_FP_rounding", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::ABI_FP_denormal(AttrType Tag, const uint8_t *Data,
-                                         uint32_t &Offset) {
-  static const char *const Strings[] = {
-    "Unsupported", "IEEE-754", "Sign Only"
-  };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::ABI_FP_denormal(AttrType tag) {
+  static const char *strings[] = {"Unsupported", "IEEE-754", "Sign Only"};
+  return parseStringAttribute("ABI_FP_denormal", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::ABI_FP_exceptions(AttrType Tag, const uint8_t *Data,
-                                           uint32_t &Offset) {
-  static const char *const Strings[] = { "Not Permitted", "IEEE-754" };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::ABI_FP_exceptions(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "IEEE-754"};
+  return parseStringAttribute("ABI_FP_exceptions", tag, makeArrayRef(strings));
 }
-
-void ARMAttributeParser::ABI_FP_user_exceptions(AttrType Tag,
-                                                const uint8_t *Data,
-                                                uint32_t &Offset) {
-  static const char *const Strings[] = { "Not Permitted", "IEEE-754" };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::ABI_FP_user_exceptions(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "IEEE-754"};
+  return parseStringAttribute("ABI_FP_user_exceptions", tag,
+                              makeArrayRef(strings));
 }
 
-void ARMAttributeParser::ABI_FP_number_model(AttrType Tag, const uint8_t *Data,
-                                             uint32_t &Offset) {
-  static const char *const Strings[] = {
-    "Not Permitted", "Finite Only", "RTABI", "IEEE-754"
-  };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::ABI_FP_number_model(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "Finite Only", "RTABI",
+                                  "IEEE-754"};
+  return parseStringAttribute("ABI_FP_number_model", tag,
+                              makeArrayRef(strings));
 }
 
-void ARMAttributeParser::ABI_align_needed(AttrType Tag, const uint8_t *Data,
-                                          uint32_t &Offset) {
-  static const char *const Strings[] = {
-    "Not Permitted", "8-byte alignment", "4-byte alignment", "Reserved"
-  };
+Error ARMAttributeParser::ABI_align_needed(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "8-byte alignment",
+                                  "4-byte alignment", "Reserved"};
 
-  uint64_t Value = ParseInteger(Data, Offset);
+  uint64_t value = de.getULEB128(cursor);
 
-  std::string Description;
-  if (Value < array_lengthof(Strings))
-    Description = std::string(Strings[Value]);
-  else if (Value <= 12)
-    Description = std::string("8-byte alignment, ") + utostr(1ULL << Value)
-                + std::string("-byte extended alignment");
+  std::string description;
+  if (value < array_lengthof(strings))
+    description = strings[value];
+  else if (value <= 12)
+    description = "8-byte alignment, " + utostr(1ULL << value) +
+                  "-byte extended alignment";
   else
-    Description = "Invalid";
+    description = "Invalid";
 
-  PrintAttribute(Tag, Value, Description);
+  printAttribute(tag, value, description);
+  return Error::success();
 }
 
-void ARMAttributeParser::ABI_align_preserved(AttrType Tag, const uint8_t *Data,
-                                             uint32_t &Offset) {
-  static const char *const Strings[] = {
-    "Not Required", "8-byte data alignment", "8-byte data and code alignment",
-    "Reserved"
-  };
+Error ARMAttributeParser::ABI_align_preserved(AttrType tag) {
+  static const char *strings[] = {"Not Required", "8-byte data alignment",
+                                  "8-byte data and code alignment", "Reserved"};
 
-  uint64_t Value = ParseInteger(Data, Offset);
+  uint64_t value = de.getULEB128(cursor);
 
-  std::string Description;
-  if (Value < array_lengthof(Strings))
-    Description = std::string(Strings[Value]);
-  else if (Value <= 12)
-    Description = std::string("8-byte stack alignment, ") +
-                  utostr(1ULL << Value) + std::string("-byte data alignment");
+  std::string description;
+  if (value < array_lengthof(strings))
+    description = std::string(strings[value]);
+  else if (value <= 12)
+    description = std::string("8-byte stack alignment, ") +
+                  utostr(1ULL << value) + std::string("-byte data alignment");
   else
-    Description = "Invalid";
+    description = "Invalid";
 
-  PrintAttribute(Tag, Value, Description);
+  printAttribute(tag, value, description);
+  return Error::success();
 }
 
-void ARMAttributeParser::ABI_enum_size(AttrType Tag, const uint8_t *Data,
-                                       uint32_t &Offset) {
-  static const char *const Strings[] = {
-    "Not Permitted", "Packed", "Int32", "External Int32"
-  };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::ABI_enum_size(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "Packed", "Int32",
+                                  "External Int32"};
+  return parseStringAttribute("ABI_enum_size", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::ABI_HardFP_use(AttrType Tag, const uint8_t *Data,
-                                        uint32_t &Offset) {
-  static const char *const Strings[] = {
-    "Tag_FP_arch", "Single-Precision", "Reserved", "Tag_FP_arch (deprecated)"
-  };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::ABI_HardFP_use(AttrType tag) {
+  static const char *strings[] = {"Tag_FP_arch", "Single-Precision", "Reserved",
+                                  "Tag_FP_arch (deprecated)"};
+  return parseStringAttribute("ABI_HardFP_use", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::ABI_VFP_args(AttrType Tag, const uint8_t *Data,
-                                      uint32_t &Offset) {
-  static const char *const Strings[] = {
-    "AAPCS", "AAPCS VFP", "Custom", "Not Permitted"
-  };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::ABI_VFP_args(AttrType tag) {
+  static const char *strings[] = {"AAPCS", "AAPCS VFP", "Custom",
+                                  "Not Permitted"};
+  return parseStringAttribute("ABI_VFP_args", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::ABI_WMMX_args(AttrType Tag, const uint8_t *Data,
-                                       uint32_t &Offset) {
-  static const char *const Strings[] = { "AAPCS", "iWMMX", "Custom" };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::ABI_WMMX_args(AttrType tag) {
+  static const char *strings[] = {"AAPCS", "iWMMX", "Custom"};
+  return parseStringAttribute("ABI_WMMX_args", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::ABI_optimization_goals(AttrType Tag,
-                                                const uint8_t *Data,
-                                                uint32_t &Offset) {
-  static const char *const Strings[] = {
+Error ARMAttributeParser::ABI_optimization_goals(AttrType tag) {
+  static const char *strings[] = {
     "None", "Speed", "Aggressive Speed", "Size", "Aggressive Size", "Debugging",
     "Best Debugging"
   };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+  return parseStringAttribute("ABI_optimization_goals", tag,
+                              makeArrayRef(strings));
 }
 
-void ARMAttributeParser::ABI_FP_optimization_goals(AttrType Tag,
-                                                   const uint8_t *Data,
-                                                   uint32_t &Offset) {
-  static const char *const Strings[] = {
-    "None", "Speed", "Aggressive Speed", "Size", "Aggressive Size", "Accuracy",
-    "Best Accuracy"
-  };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::ABI_FP_optimization_goals(AttrType tag) {
+  static const char *strings[] = {
+      "None",     "Speed",        "Aggressive Speed", "Size", "Aggressive Size",
+      "Accuracy", "Best Accuracy"};
+  return parseStringAttribute("ABI_FP_optimization_goals", tag,
+                              makeArrayRef(strings));
 }
 
-void ARMAttributeParser::compatibility(AttrType Tag, const uint8_t *Data,
-                                       uint32_t &Offset) {
-  uint64_t Integer = ParseInteger(Data, Offset);
-  StringRef String = ParseString(Data, Offset);
+Error ARMAttributeParser::compatibility(AttrType tag) {
+  uint64_t integer = de.getULEB128(cursor);
+  StringRef string = de.getCStrRef(cursor);
 
-  if (SW) {
-    DictScope AS(*SW, "Attribute");
-    SW->printNumber("Tag", Tag);
-    SW->startLine() << "Value: " << Integer << ", " << String << '\n';
-    SW->printString("TagName", AttrTypeAsString(Tag, /*TagPrefix*/false));
-    switch (Integer) {
+  if (sw) {
+    DictScope scope(*sw, "Attribute");
+    sw->printNumber("Tag", tag);
+    sw->startLine() << "Value: " << integer << ", " << string << '\n';
+    sw->printString("TagName", AttrTypeAsString(tag, /*TagPrefix*/ false));
+    switch (integer) {
     case 0:
-      SW->printString("Description", StringRef("No Specific Requirements"));
+      sw->printString("Description", StringRef("No Specific Requirements"));
       break;
     case 1:
-      SW->printString("Description", StringRef("AEABI Conformant"));
+      sw->printString("Description", StringRef("AEABI Conformant"));
       break;
     default:
-      SW->printString("Description", StringRef("AEABI Non-Conformant"));
+      sw->printString("Description", StringRef("AEABI Non-Conformant"));
       break;
     }
   }
+  return Error::success();
 }
 
-void ARMAttributeParser::CPU_unaligned_access(AttrType Tag, const uint8_t *Data,
-                                              uint32_t &Offset) {
-  static const char *const Strings[] = { "Not Permitted", "v6-style" };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::CPU_unaligned_access(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "v6-style"};
+  return parseStringAttribute("CPU_unaligned_access", tag,
+                              makeArrayRef(strings));
 }
 
-void ARMAttributeParser::FP_HP_extension(AttrType Tag, const uint8_t *Data,
-                                         uint32_t &Offset) {
-  static const char *const Strings[] = { "If Available", "Permitted" };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::FP_HP_extension(AttrType tag) {
+  static const char *strings[] = {"If Available", "Permitted"};
+  return parseStringAttribute("FP_HP_extension", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::ABI_FP_16bit_format(AttrType Tag, const uint8_t *Data,
-                                             uint32_t &Offset) {
-  static const char *const Strings[] = { "Not Permitted", "IEEE-754", "VFPv3" };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::ABI_FP_16bit_format(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "IEEE-754", "VFPv3"};
+  return parseStringAttribute("ABI_FP_16bit_format", tag,
+                              makeArrayRef(strings));
 }
 
-void ARMAttributeParser::MPextension_use(AttrType Tag, const uint8_t *Data,
-                                         uint32_t &Offset) {
-  static const char *const Strings[] = { "Not Permitted", "Permitted" };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::MPextension_use(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "Permitted"};
+  return parseStringAttribute("MPextension_use", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::DIV_use(AttrType Tag, const uint8_t *Data,
-                                 uint32_t &Offset) {
-  static const char *const Strings[] = {
-    "If Available", "Not Permitted", "Permitted"
-  };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::DIV_use(AttrType tag) {
+  static const char *strings[] = {"If Available", "Not Permitted", "Permitted"};
+  return parseStringAttribute("DIV_use", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::DSP_extension(AttrType Tag, const uint8_t *Data,
-                                       uint32_t &Offset) {
-  static const char *const Strings[] = { "Not Permitted", "Permitted" };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::DSP_extension(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "Permitted"};
+  return parseStringAttribute("DSP_extension", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::T2EE_use(AttrType Tag, const uint8_t *Data,
-                                  uint32_t &Offset) {
-  static const char *const Strings[] = { "Not Permitted", "Permitted" };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::T2EE_use(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "Permitted"};
+  return parseStringAttribute("T2EE_use", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::Virtualization_use(AttrType Tag, const uint8_t *Data,
-                                            uint32_t &Offset) {
-  static const char *const Strings[] = {
-    "Not Permitted", "TrustZone", "Virtualization Extensions",
-    "TrustZone + Virtualization Extensions"
-  };
-
-  uint64_t Value = ParseInteger(Data, Offset);
-  StringRef ValueDesc =
-    (Value < array_lengthof(Strings)) ? Strings[Value] : nullptr;
-  PrintAttribute(Tag, Value, ValueDesc);
+Error ARMAttributeParser::Virtualization_use(AttrType tag) {
+  static const char *strings[] = {"Not Permitted", "TrustZone",
+                                  "Virtualization Extensions",
+                                  "TrustZone + Virtualization Extensions"};
+  return parseStringAttribute("Virtualization_use", tag, makeArrayRef(strings));
 }
 
-void ARMAttributeParser::nodefaults(AttrType Tag, const uint8_t *Data,
-                                    uint32_t &Offset) {
-  uint64_t Value = ParseInteger(Data, Offset);
-  PrintAttribute(Tag, Value, "Unspecified Tags UNDEFINED");
+Error ARMAttributeParser::nodefaults(AttrType tag) {
+  uint64_t value = de.getULEB128(cursor);
+  printAttribute(tag, value, "Unspecified Tags UNDEFINED");
+  return Error::success();
 }
 
-void ARMAttributeParser::ParseIndexList(const uint8_t *Data, uint32_t &Offset,
-                                        SmallVectorImpl<uint8_t> &IndexList) {
+void ARMAttributeParser::parseIndexList(SmallVectorImpl<uint8_t> &indexList) {
   for (;;) {
-    unsigned DecodeLength;
-    uint64_t Value = decodeULEB128(Data + Offset, &DecodeLength);
-    Offset += DecodeLength;
-    if (Value == 0)
+    uint64_t value = de.getULEB128(cursor);
+    if (!cursor || !value)
       break;
-    IndexList.push_back(Value);
+    indexList.push_back(value);
   }
 }
 
-void ARMAttributeParser::ParseAttributeList(const uint8_t *Data,
-                                            uint32_t &Offset, uint32_t Length) {
-  while (Offset < Length) {
-    unsigned DecodeLength;
-    uint64_t Tag = decodeULEB128(Data + Offset, &DecodeLength);
-    Offset += DecodeLength;
-
-    bool Handled = false;
-    for (unsigned AHI = 0, AHE = array_lengthof(DisplayRoutines);
-         AHI != AHE && !Handled; ++AHI) {
-      if (uint64_t(DisplayRoutines[AHI].Attribute) == Tag) {
-        (this->*DisplayRoutines[AHI].Routine)(ARMBuildAttrs::AttrType(Tag),
-                                              Data, Offset);
-        Handled = true;
+Error ARMAttributeParser::parseAttributeList(uint32_t length) {
+  uint64_t pos;
+  uint64_t end = cursor.tell() + length;
+  while ((pos = cursor.tell()) < end) {
+    uint64_t tag = de.getULEB128(cursor);
+    bool handled = false;
+    for (unsigned AHI = 0, AHE = array_lengthof(displayRoutines);
+         AHI != AHE && !handled; ++AHI) {
+      if (uint64_t(displayRoutines[AHI].attribute) == tag) {
+        if (Error e = (this->*displayRoutines[AHI].routine)(
+                ARMBuildAttrs::AttrType(tag)))
+          return e;
+        handled = true;
         break;
       }
     }
-    if (!Handled) {
-      if (Tag < 32) {
-        errs() << "unhandled AEABI Tag " << Tag
-               << " (" << ARMBuildAttrs::AttrTypeAsString(Tag) << ")\n";
-        continue;
+    if (!handled) {
+      if (tag < 32)
+        return createStringError(errc::invalid_argument,
+                                 "invalid AEABI tag 0x" +
+                                     Twine::utohexstr(tag) + " at offset 0x" +
+                                     Twine::utohexstr(pos));
+
+      if (tag % 2 == 0) {
+        uint64_t value = de.getULEB128(cursor);
+        attributes.insert(std::make_pair(tag, value));
+        if (sw)
+          sw->printNumber(ARMBuildAttrs::AttrTypeAsString(tag), value);
+      } else {
+        StringRef tagName =
+            ARMBuildAttrs::AttrTypeAsString(tag, /*TagPrefix=*/false);
+        StringRef desc = de.getCStrRef(cursor);
+
+        if (sw) {
+          DictScope scope(*sw, "Attribute");
+          sw->printNumber("Tag", tag);
+          if (!tagName.empty())
+            sw->printString("TagName", tagName);
+          sw->printString("Value", desc);
+        }
       }
-
-      if (Tag % 2 == 0)
-        IntegerAttribute(ARMBuildAttrs::AttrType(Tag), Data, Offset);
-      else
-        StringAttribute(ARMBuildAttrs::AttrType(Tag), Data, Offset);
     }
   }
+  return Error::success();
 }
 
-void ARMAttributeParser::ParseSubsection(const uint8_t *Data, uint32_t Length) {
-  uint32_t Offset = sizeof(uint32_t); /* SectionLength */
-
-  const char *VendorName = reinterpret_cast<const char*>(Data + Offset);
-  size_t VendorNameLength = std::strlen(VendorName);
-  Offset = Offset + VendorNameLength + 1;
-
-  if (SW) {
-    SW->printNumber("SectionLength", Length);
-    SW->printString("Vendor", StringRef(VendorName, VendorNameLength));
+Error ARMAttributeParser::parseSubsection(uint32_t length) {
+  uint64_t end = cursor.tell() - sizeof(length) + length;
+  StringRef vendorName = de.getCStrRef(cursor);
+  if (sw) {
+    sw->printNumber("SectionLength", length);
+    sw->printString("Vendor", vendorName);
   }
 
-  if (StringRef(VendorName, VendorNameLength).lower() != "aeabi") {
-    return;
-  }
+  // Ignore unrecognized vendor-name.
+  if (vendorName.lower() != "aeabi")
+    return createStringError(errc::invalid_argument,
+                             "unrecognized vendor-name: " + vendorName);
 
-  while (Offset < Length) {
+  while (cursor.tell() < end) {
     /// Tag_File | Tag_Section | Tag_Symbol   uleb128:byte-size
-    uint8_t Tag = Data[Offset];
-    Offset = Offset + sizeof(Tag);
-
-    uint32_t Size =
-      *reinterpret_cast<const support::ulittle32_t*>(Data + Offset);
-    Offset = Offset + sizeof(Size);
-
-    if (SW) {
-      SW->printEnum("Tag", Tag, makeArrayRef(TagNames));
-      SW->printNumber("Size", Size);
+    uint8_t tag = de.getU8(cursor);
+    uint32_t size = de.getU32(cursor);
+    if (!cursor)
+      return cursor.takeError();
+
+    if (sw) {
+      sw->printEnum("Tag", tag, makeArrayRef(tagNames));
+      sw->printNumber("Size", size);
     }
-
-    if (Size > Length) {
-      errs() << "subsection length greater than section length\n";
-      return;
-    }
-
-    StringRef ScopeName, IndexName;
-    SmallVector<uint8_t, 8> Indicies;
-    switch (Tag) {
+    if (size < 5)
+      return createStringError(errc::invalid_argument,
+                               "invalid attribute size " + Twine(size) +
+                                   " at offset 0x" +
+                                   Twine::utohexstr(cursor.tell() - 5));
+
+    StringRef scopeName, indexName;
+    SmallVector<uint8_t, 8> indicies;
+    switch (tag) {
     case ARMBuildAttrs::File:
-      ScopeName = "FileAttributes";
+      scopeName = "FileAttributes";
       break;
     case ARMBuildAttrs::Section:
-      ScopeName = "SectionAttributes";
-      IndexName = "Sections";
-      ParseIndexList(Data, Offset, Indicies);
+      scopeName = "SectionAttributes";
+      indexName = "Sections";
+      parseIndexList(indicies);
       break;
     case ARMBuildAttrs::Symbol:
-      ScopeName = "SymbolAttributes";
-      IndexName = "Symbols";
-      ParseIndexList(Data, Offset, Indicies);
+      scopeName = "SymbolAttributes";
+      indexName = "Symbols";
+      parseIndexList(indicies);
       break;
     default:
-      errs() << "unrecognised tag: 0x" << Twine::utohexstr(Tag) << '\n';
-      return;
+      return createStringError(errc::invalid_argument,
+                               "unrecognized tag 0x" + Twine::utohexstr(tag) +
+                                   " at offset 0x" +
+                                   Twine::utohexstr(cursor.tell() - 5));
     }
 
-    if (SW) {
-      DictScope ASS(*SW, ScopeName);
-      if (!Indicies.empty())
-        SW->printList(IndexName, Indicies);
-      ParseAttributeList(Data, Offset, Length);
-    } else {
-      ParseAttributeList(Data, Offset, Length);
-    }
+    if (sw) {
+      DictScope scope(*sw, scopeName);
+      if (!indicies.empty())
+        sw->printList(indexName, indicies);
+      if (Error e = parseAttributeList(size - 5))
+        return e;
+    } else if (Error e = parseAttributeList(size - 5))
+      return e;
   }
-}
-
-void ARMAttributeParser::parse(ArrayRef<uint8_t> Section,
-                               support::endianness E) {
-  uint64_t Offset = 1;
-  unsigned SectionNumber = 0;
-
-  while (Offset < Section.size()) {
-    uint32_t SectionLength =
-        support::endian::read32(Section.data() + Offset, E);
-
-    if (SW) {
-      SW->startLine() << "Section " << ++SectionNumber << " {\n";
-      SW->indent();
+  return Error::success();
+}
+
+Error ARMAttributeParser::parse(ArrayRef<uint8_t> section,
+                                support::endianness endian) {
+  unsigned sectionNumber = 0;
+  de = DataExtractor(section, endian == support::little, 0);
+
+  // For early returns, we have more specific errors, consume the Error in
+  // cursor.
+  struct ClearCursorError {
+    DataExtractor::Cursor &cursor;
+    ~ClearCursorError() { consumeError(cursor.takeError()); }
+  } clear{cursor};
+
+  // Unrecognized format-version.
+  uint8_t formatVersion = de.getU8(cursor);
+  if (formatVersion != 'A')
+    return createStringError(errc::invalid_argument,
+                             "unrecognized format-version: 0x" +
+                                 utohexstr(formatVersion));
+
+  while (!de.eof(cursor)) {
+    uint32_t sectionLength = de.getU32(cursor);
+    if (!cursor)
+      return cursor.takeError();
+
+    if (sw) {
+      sw->startLine() << "Section " << ++sectionNumber << " {\n";
+      sw->indent();
     }
 
-    if (SectionLength == 0 || (SectionLength + Offset) > Section.size()) {
-      errs() << "invalid subsection length " << SectionLength << " at offset "
-             << Offset << "\n";
-      return;
-    }
-
-    ParseSubsection(Section.data() + Offset, SectionLength);
-    Offset = Offset + SectionLength;
-
-    if (SW) {
-      SW->unindent();
-      SW->startLine() << "}\n";
+    if (sectionLength < 4 || cursor.tell() - 4 + sectionLength > section.size())
+      return createStringError(errc::invalid_argument,
+                               "invalid subsection length " +
+                                   Twine(sectionLength) + " at offset 0x" +
+                                   utohexstr(cursor.tell() - 4));
+    if (Error e = parseSubsection(sectionLength))
+      return e;
+    if (sw) {
+      sw->unindent();
+      sw->startLine() << "}\n";
     }
   }
-}
+
+  return cursor.takeError();
 }

diff  --git a/llvm/tools/llvm-readobj/ELFDumper.cpp b/llvm/tools/llvm-readobj/ELFDumper.cpp
index 314244dce4ea..283f1b24020d 100644
--- a/llvm/tools/llvm-readobj/ELFDumper.cpp
+++ b/llvm/tools/llvm-readobj/ELFDumper.cpp
@@ -2690,7 +2690,9 @@ template <> void ELFDumper<ELF32LE>::printAttributes() {
     if (Contents.size() == 1)
       continue;
 
-    ARMAttributeParser(&W).parse(Contents, support::little);
+    // TODO: Print error and delete the redundant FormatVersion check above.
+    if (Error E = ARMAttributeParser(&W).parse(Contents, support::little))
+      consumeError(std::move(E));
   }
 }
 

diff  --git a/llvm/unittests/Support/ARMAttributeParser.cpp b/llvm/unittests/Support/ARMAttributeParser.cpp
index adb36de8e66b..76a0407df6a6 100644
--- a/llvm/unittests/Support/ARMAttributeParser.cpp
+++ b/llvm/unittests/Support/ARMAttributeParser.cpp
@@ -34,16 +34,55 @@ bool testBuildAttr(unsigned Tag, unsigned Value,
     reinterpret_cast<const uint8_t*>(OS.str().c_str()), OS.str().size());
 
   ARMAttributeParser Parser;
-  Parser.parse(Bytes, support::little);
+  cantFail(Parser.parse(Bytes, support::little));
 
   return (Parser.hasAttribute(ExpectedTag) &&
     Parser.getAttributeValue(ExpectedTag) == ExpectedValue);
 }
 
+void testParseError(ArrayRef<uint8_t> bytes, const char *msg) {
+  ARMAttributeParser parser;
+  Error e = parser.parse(bytes, support::little);
+  EXPECT_STREQ(toString(std::move(e)).c_str(), msg);
+}
+
 bool testTagString(unsigned Tag, const char *name) {
   return ARMBuildAttrs::AttrTypeAsString(Tag).str() == name;
 }
 
+TEST(ARMAttributeParser, UnrecognizedFormatVersion) {
+  static const uint8_t bytes[] = {1};
+  testParseError(bytes, "unrecognized format-version: 0x1");
+}
+
+TEST(ARMAttributeParser, InvalidSubsectionLength) {
+  static const uint8_t bytes[] = {'A', 3, 0, 0, 0};
+  testParseError(bytes, "invalid subsection length 3 at offset 0x1");
+}
+
+TEST(ARMAttributeParser, UnrecognizedVendorName) {
+  static const uint8_t bytes[] = {'A', 7, 0, 0, 0, 'x', 'y', 0};
+  testParseError(bytes, "unrecognized vendor-name: xy");
+}
+
+TEST(ARMAttributeParser, InvalidAttributeSize) {
+  static const uint8_t bytes[] = {'A', 15,  0, 0, 0, 'a', 'e', 'a',
+                                  'b', 'i', 0, 4, 4, 0,   0,   0};
+  testParseError(bytes, "invalid attribute size 4 at offset 0xb");
+}
+
+TEST(ARMAttributeParser, UnrecognizedTag) {
+  static const uint8_t bytes[] = {'A', 15,  0, 0, 0, 'a', 'e', 'a',
+                                  'b', 'i', 0, 4, 5, 0,   0,   0};
+  testParseError(bytes, "unrecognized tag 0x4 at offset 0xb");
+}
+
+TEST(ARMAttributeParser, UnknownCPU_arch) {
+  static const uint8_t bytes[] = {'A', 15, 0, 0, 0, 'a', 'e', 'a', 'b',
+                                  'i', 0,  1, 7, 0, 0,   0,   6,   22};
+  testParseError(bytes, "unknown CPU_arch value: 22");
+}
+
 TEST(CPUArchBuildAttr, testBuildAttr) {
   EXPECT_TRUE(testTagString(6, "Tag_CPU_arch"));
 


        


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