From 4ba1f5e0011fa0c17ff121634bf8e88270f3b52e Mon Sep 17 00:00:00 2001
From: Daniel Dunbar <daniel@zuster.org>
Date: Sat, 27 Nov 2010 08:22:29 +0000
Subject: macho-dump: Add support for dumping segment load commands.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120203 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Object/MachOObject.cpp | 68 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)

(limited to 'lib/Object/MachOObject.cpp')

diff --git a/lib/Object/MachOObject.cpp b/lib/Object/MachOObject.cpp
index 5c17dfcfe9..ce817d6cac 100644
--- a/lib/Object/MachOObject.cpp
+++ b/lib/Object/MachOObject.cpp
@@ -16,11 +16,43 @@
 using namespace llvm;
 using namespace llvm::object;
 
+/* Translation Utilities */
+
 template<typename T>
 static void SwapValue(T &Value) {
   Value = sys::SwapByteOrder(Value);
 }
 
+template<typename T>
+static void SwapStruct(T &Value);
+
+template<typename T>
+static void ReadInMemoryStruct(const MachOObject &MOO,
+                               StringRef Buffer, uint64_t Base,
+                               InMemoryStruct<T> &Res) {
+  typedef T struct_type;
+  uint64_t Size = sizeof(struct_type);
+
+  // Check that the buffer contains the expected data.
+  if (Base + Size >  Buffer.size()) {
+    Res = 0;
+    return;
+  }
+
+  // Check whether we can return a direct pointer.
+  struct_type *Ptr = (struct_type *) (Buffer.data() + Base);
+  if (!MOO.isSwappedEndian()) {
+    Res = Ptr;
+    return;
+  }
+
+  // Otherwise, copy the struct and translate the values.
+  Res = *Ptr;
+  SwapStruct(*Res);
+}
+
+/* *** */
+
 MachOObject::MachOObject(MemoryBuffer *Buffer_, bool IsLittleEndian_,
                          bool Is64Bit_)
   : Buffer(Buffer_), IsLittleEndian(IsLittleEndian_), Is64Bit(Is64Bit_),
@@ -120,3 +152,39 @@ MachOObject::getLoadCommandInfo(unsigned Index) const {
 
   return LoadCommands[Index];
 }
+
+template<>
+static void SwapStruct(macho::SegmentLoadCommand &Value) {
+  SwapValue(Value.Type);
+  SwapValue(Value.Size);
+  SwapValue(Value.VMAddress);
+  SwapValue(Value.VMSize);
+  SwapValue(Value.FileOffset);
+  SwapValue(Value.FileSize);
+  SwapValue(Value.MaxVMProtection);
+  SwapValue(Value.InitialVMProtection);
+  SwapValue(Value.NumSections);
+  SwapValue(Value.Flags);
+}
+void MachOObject::ReadSegmentLoadCommand(const LoadCommandInfo &LCI,
+                         InMemoryStruct<macho::SegmentLoadCommand> &Res) const {
+  ReadInMemoryStruct(*this, Buffer->getBuffer(), LCI.Offset, Res);
+}
+
+template<>
+static void SwapStruct(macho::Segment64LoadCommand &Value) {
+  SwapValue(Value.Type);
+  SwapValue(Value.Size);
+  SwapValue(Value.VMAddress);
+  SwapValue(Value.VMSize);
+  SwapValue(Value.FileOffset);
+  SwapValue(Value.FileSize);
+  SwapValue(Value.MaxVMProtection);
+  SwapValue(Value.InitialVMProtection);
+  SwapValue(Value.NumSections);
+  SwapValue(Value.Flags);
+}
+void MachOObject::ReadSegment64LoadCommand(const LoadCommandInfo &LCI,
+                       InMemoryStruct<macho::Segment64LoadCommand> &Res) const {
+  ReadInMemoryStruct(*this, Buffer->getBuffer(), LCI.Offset, Res);
+}
-- 
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