Add EH support to the MCJIT.

This gets exception handling working on ELF and Macho (x86-64 at least).
Other than the EH frame registration, this patch also implements support
for GOT relocations which are used to locate the personality function on
MachO.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181167 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 9 insertions, 0 deletions

diff --git a/include/llvm/ExecutionEngine/RuntimeDyld.h b/include/llvm/ExecutionEngine/RuntimeDyld.h
index 4222d5335b..c6c126c6e2 100644
--- a/include/llvm/ExecutionEngine/RuntimeDyld.h
+++ b/include/llvm/ExecutionEngine/RuntimeDyld.h
@@ -66,6 +66,11 @@ public:
   ///
   /// Returns true if an error occurred, false otherwise.
   virtual bool applyPermissions(std::string *ErrMsg = 0) = 0;
+
+  /// Register the EH frames with the runtime so that c++ exceptions work. The
+  /// default implementation does nothing. Look at SectionMemoryManager for one
+  /// that uses __register_frame.
+  virtual void registerEHFrames(StringRef SectionData);
 };
 
 class RuntimeDyld {
@@ -109,6 +114,8 @@ public:
   void mapSectionAddress(const void *LocalAddress, uint64_t TargetAddress);
 
   StringRef getErrorString();
+
+  StringRef getEHFrameSection();
 };
 
 } // end namespace llvm
diff --git a/include/llvm/ExecutionEngine/SectionMemoryManager.h b/include/llvm/ExecutionEngine/SectionMemoryManager.h
index 9ac8c92524..84a4e08cbb 100644
--- a/include/llvm/ExecutionEngine/SectionMemoryManager.h
+++ b/include/llvm/ExecutionEngine/SectionMemoryManager.h
@@ -72,6 +72,8 @@ public:
   /// \returns true if an error occurred, false otherwise.
   virtual bool applyPermissions(std::string *ErrMsg = 0);
 
+  void registerEHFrames(StringRef SectionData);
+
   /// This method returns the address of the specified function. As such it is
   /// only useful for resolving library symbols, not code generated symbols.
   ///