From 7dac32d07d54231ba203f7c32f3a9f8e6730810f Mon Sep 17 00:00:00 2001
From: Ahmed Bougacha <ahmed.bougacha@gmail.com>
Date: Wed, 21 Aug 2013 07:27:55 +0000
Subject: [PATCH] MC CFG: Keep pointer to parent MCModule in created
 MCFunctions.

Also, drive-by cleaning around createFunction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188875 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/MC/MCFunction.h | 7 ++++---
 include/llvm/MC/MCModule.h   | 5 +++--
 lib/MC/MCFunction.cpp        | 6 +++---
 lib/MC/MCModule.cpp          | 8 ++++++--
 4 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/include/llvm/MC/MCFunction.h b/include/llvm/MC/MCFunction.h
index b85011eda7e..4c75cd4c25f 100644
--- a/include/llvm/MC/MCFunction.h
+++ b/include/llvm/MC/MCFunction.h
@@ -74,21 +74,22 @@ public:
 };
 
 /// \brief Represents a function in machine code, containing MCBasicBlocks.
-/// MCFunctions are created using MCModule::createFunction.
+/// MCFunctions are created by MCModule.
 class MCFunction {
   MCFunction           (const MCFunction&) LLVM_DELETED_FUNCTION;
   MCFunction& operator=(const MCFunction&) LLVM_DELETED_FUNCTION;
 
   std::string Name;
+  MCModule *ParentModule;
   typedef std::vector<MCBasicBlock*> BasicBlockListTy;
   BasicBlockListTy Blocks;
 
   // MCModule owns the function.
   friend class MCModule;
-  MCFunction(StringRef Name);
-public:
+  MCFunction(StringRef Name, MCModule *Parent);
   ~MCFunction();
 
+public:
   /// \brief Create an MCBasicBlock backed by Insts and add it to this function.
   /// \param Insts Sequence of straight-line code backing the basic block.
   /// \returns The newly created basic block.
diff --git a/include/llvm/MC/MCModule.h b/include/llvm/MC/MCModule.h
index 02f8ca05b41..6d493628b7c 100644
--- a/include/llvm/MC/MCModule.h
+++ b/include/llvm/MC/MCModule.h
@@ -23,6 +23,7 @@
 namespace llvm {
 
 class MCAtom;
+class MCBasicBlock;
 class MCDataAtom;
 class MCFunction;
 class MCObjectDisassembler;
@@ -88,8 +89,8 @@ public:
         atom_iterator atom_end()         { return Atoms.end(); }
   /// @}
 
-  /// \name Create a new MCFunction.
-  MCFunction *createFunction(const StringRef &Name);
+  /// \brief Create a new MCFunction.
+  MCFunction *createFunction(StringRef Name);
 
   /// \name Access to the owned function list.
   /// @{
diff --git a/lib/MC/MCFunction.cpp b/lib/MC/MCFunction.cpp
index 473d07bf994..cb2504668a3 100644
--- a/lib/MC/MCFunction.cpp
+++ b/lib/MC/MCFunction.cpp
@@ -9,15 +9,15 @@
 
 #include "llvm/MC/MCFunction.h"
 #include "llvm/MC/MCAtom.h"
-#include "llvm/Support/raw_ostream.h"
+#include "llvm/MC/MCModule.h"
 #include <algorithm>
 
 using namespace llvm;
 
 // MCFunction
 
-MCFunction::MCFunction(StringRef Name)
-  : Name(Name)
+MCFunction::MCFunction(StringRef Name, MCModule *Parent)
+  : Name(Name), ParentModule(Parent)
 {}
 
 MCFunction::~MCFunction() {
diff --git a/lib/MC/MCModule.cpp b/lib/MC/MCModule.cpp
index 5890b4bd028..9a9d90e5b6a 100644
--- a/lib/MC/MCModule.cpp
+++ b/lib/MC/MCModule.cpp
@@ -54,9 +54,13 @@ void MCModule::remap(MCAtom *Atom, uint64_t NewBegin, uint64_t NewEnd) {
   assert(*I == Atom && "Previous atom mapping was invalid!");
   Atoms.erase(I);
 
+  // FIXME: special case NewBegin == Atom->Begin
+
   // Insert the new mapping.
   AtomListTy::iterator NewI = std::lower_bound(atom_begin(), atom_end(),
                                                NewBegin, AtomComp);
+  assert((NewI == atom_end() || (*NewI)->getBeginAddr() > Atom->End)
+         && "Offset range already occupied!");
   Atoms.insert(NewI, Atom);
 
   // Update the atom internal bounds.
@@ -80,8 +84,8 @@ MCAtom *MCModule::findAtomContaining(uint64_t Addr) {
   return 0;
 }
 
-MCFunction *MCModule::createFunction(const StringRef &Name) {
-  Functions.push_back(new MCFunction(Name));
+MCFunction *MCModule::createFunction(StringRef Name) {
+  Functions.push_back(new MCFunction(Name, this));
   return Functions.back();
 }