[ARM] Enable objdump to construct triple for ARM

Now that The ARMAttributeParser has been moved into the library,
it has been modified so that it can parse the attributes without
printing them and stores them in a map. ELFObjectFile now queries
the attributes to fill out the architecture details of a provided
triple for 'arm' and 'thumb' targets. llvm-objdump uses this new
functionality.

Differential Revision: https://reviews.llvm.org/D28281

llvm-svn: 291898

1 files changed, 73 insertions, 48 deletions

diff --git a/llvm/lib/Support/ARMAttributeParser.cpp b/llvm/lib/Support/ARMAttributeParser.cpp
index 792510e6b84..5d9b2306b9a 100644
--- a/llvm/lib/Support/ARMAttributeParser.cpp
+++ b/llvm/lib/Support/ARMAttributeParser.cpp
@@ -89,32 +89,43 @@ StringRef ARMAttributeParser::ParseString(const uint8_t *Data,
 
 void ARMAttributeParser::IntegerAttribute(AttrType Tag, const uint8_t *Data,
                                           uint32_t &Offset) {
-  SW.printNumber(ARMBuildAttrs::AttrTypeAsString(Tag),
-                 ParseInteger(Data, Offset));
+
+  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);
-
-  DictScope AS(SW, "Attribute");
-  SW.printNumber("Tag", Tag);
-  if (!TagName.empty())
-    SW.printString("TagName", TagName);
-  SW.printString("Value", ParseString(Data, Offset));
+  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);
+  }
 }
 
 void ARMAttributeParser::PrintAttribute(unsigned Tag, unsigned Value,
                                         StringRef ValueDesc) {
-  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);
+  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::CPU_arch(AttrType Tag, const uint8_t *Data,
@@ -449,20 +460,22 @@ void ARMAttributeParser::compatibility(AttrType Tag, const uint8_t *Data,
   uint64_t Integer = ParseInteger(Data, Offset);
   StringRef String = ParseString(Data, Offset);
 
-  DictScope AS(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"));
-    break;
-  case 1:
-    SW.printString("Description", StringRef("AEABI Conformant"));
-    break;
-  default:
-    SW.printString("Description", StringRef("AEABI Non-Conformant"));
-    break;
+  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) {
+    case 0:
+      SW->printString("Description", StringRef("No Specific Requirements"));
+      break;
+    case 1:
+      SW->printString("Description", StringRef("AEABI Conformant"));
+      break;
+    default:
+      SW->printString("Description", StringRef("AEABI Non-Conformant"));
+      break;
+    }
   }
 }
 
@@ -604,27 +617,33 @@ void ARMAttributeParser::ParseAttributeList(const uint8_t *Data,
 void ARMAttributeParser::ParseSubsection(const uint8_t *Data, uint32_t Length) {
   uint32_t Offset = sizeof(uint32_t); /* SectionLength */
 
-  SW.printNumber("SectionLength", Length);
-
   const char *VendorName = reinterpret_cast<const char*>(Data + Offset);
   size_t VendorNameLength = std::strlen(VendorName);
-  SW.printString("Vendor", StringRef(VendorName, VendorNameLength));
   Offset = Offset + VendorNameLength + 1;
 
-  if (StringRef(VendorName, VendorNameLength).lower() != "aeabi")
+  if (SW) {
+    SW->printNumber("SectionLength", Length);
+    SW->printString("Vendor", StringRef(VendorName, VendorNameLength));
+  }
+
+  if (StringRef(VendorName, VendorNameLength).lower() != "aeabi") {
     return;
+  }
 
   while (Offset < Length) {
     /// Tag_File | Tag_Section | Tag_Symbol   uleb128:byte-size
     uint8_t Tag = Data[Offset];
-    SW.printEnum("Tag", Tag, makeArrayRef(TagNames));
     Offset = Offset + sizeof(Tag);
 
     uint32_t Size =
       *reinterpret_cast<const support::ulittle32_t*>(Data + Offset);
-    SW.printNumber("Size", Size);
     Offset = Offset + sizeof(Size);
 
+    if (SW) {
+      SW->printEnum("Tag", Tag, makeArrayRef(TagNames));
+      SW->printNumber("Size", Size);
+    }
+
     if (Size > Length) {
       errs() << "subsection length greater than section length\n";
       return;
@@ -651,31 +670,37 @@ void ARMAttributeParser::ParseSubsection(const uint8_t *Data, uint32_t Length) {
       return;
     }
 
-    DictScope ASS(SW, ScopeName);
-
-    if (!Indicies.empty())
-      SW.printList(IndexName, Indicies);
+    if (SW) {
+      DictScope ASS(*SW, ScopeName);
+      if (!Indicies.empty())
+        SW->printList(IndexName, Indicies);
+    }
 
     ParseAttributeList(Data, Offset, Length);
   }
 }
 
-void ARMAttributeParser::Parse(ArrayRef<uint8_t> Section) {
+void ARMAttributeParser::Parse(ArrayRef<uint8_t> Section, bool isLittle) {
   size_t Offset = 1;
   unsigned SectionNumber = 0;
 
   while (Offset < Section.size()) {
-    uint32_t SectionLength =
-      *reinterpret_cast<const support::ulittle32_t*>(Section.data() + Offset);
+    uint32_t SectionLength = isLittle ?
+      *reinterpret_cast<const support::ulittle32_t*>(Section.data() + Offset) :
+      *reinterpret_cast<const support::ubig32_t*>(Section.data() + Offset);
 
-    SW.startLine() << "Section " << ++SectionNumber << " {\n";
-    SW.indent();
+    if (SW) {
+      SW->startLine() << "Section " << ++SectionNumber << " {\n";
+      SW->indent();
+    }
 
     ParseSubsection(Section.data() + Offset, SectionLength);
     Offset = Offset + SectionLength;
 
-    SW.unindent();
-    SW.startLine() << "}\n";
+    if (SW) {
+      SW->unindent();
+      SW->startLine() << "}\n";
+    }
   }
 }
 }