Implement GDB integration for source level debugging of code JITed using

the MCJIT execution engine.

The GDB JIT debugging integration support works by registering a loaded
object image with a pre-defined function that GDB will monitor if GDB
is attached. GDB integration support is implemented for ELF only at this
time. This integration requires GDB version 7.0 or newer.

Patch by Andy Kaylor!

 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154868 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 17 insertions, 4 deletions

diff --git a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldImpl.h b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldImpl.h
index bf678af6ec..2dea13f15c 100644
--- a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldImpl.h
+++ b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldImpl.h
@@ -29,6 +29,7 @@
 #include "llvm/ADT/Triple.h"
 #include <map>
 #include "llvm/Support/Format.h"
+#include "ObjectImage.h"
 
 using namespace llvm;
 using namespace llvm::object;
@@ -154,7 +155,8 @@ protected:
 
   /// \brief Emits a section containing common symbols.
   /// \return SectionID.
-  unsigned emitCommonSymbols(const CommonSymbolMap &Map,
+  unsigned emitCommonSymbols(ObjectImage &Obj,
+                             const CommonSymbolMap &Map,
                              uint64_t TotalSize,
                              LocalSymbolMap &Symbols);
 
@@ -162,14 +164,18 @@ protected:
   /// \param IsCode if it's true then allocateCodeSection() will be
   ///        used for emmits, else allocateDataSection() will be used.
   /// \return SectionID.
-  unsigned emitSection(const SectionRef &Section, bool IsCode);
+  unsigned emitSection(ObjectImage &Obj,
+                       const SectionRef &Section,
+                       bool IsCode);
 
   /// \brief Find Section in LocalSections. If the secton is not found - emit
   ///        it and store in LocalSections.
   /// \param IsCode if it's true then allocateCodeSection() will be
   ///        used for emmits, else allocateDataSection() will be used.
   /// \return SectionID.
-  unsigned findOrEmitSection(const SectionRef &Section, bool IsCode,
+  unsigned findOrEmitSection(ObjectImage &Obj,
+                             const SectionRef &Section,
+                             bool IsCode,
                              ObjSectionToIDMap &LocalSections);
 
   /// \brief If Value.SymbolName is NULL then store relocation to the
@@ -200,11 +206,18 @@ protected:
   /// \brief Parses the object file relocation and store it to Relocations
   ///        or SymbolRelocations. Its depend from object file type.
   virtual void processRelocationRef(const ObjRelocationInfo &Rel,
-                                    const ObjectFile &Obj,
+                                    ObjectImage &Obj,
                                     ObjSectionToIDMap &ObjSectionToID,
                                     LocalSymbolMap &Symbols, StubMap &Stubs) = 0;
 
   void resolveSymbols();
+  virtual ObjectImage *createObjectImage(const MemoryBuffer *InputBuffer);
+  virtual void handleObjectLoaded(ObjectImage *Obj)
+  {
+    // Subclasses may choose to retain this image if they have a use for it
+    delete Obj;
+  }
+
 public:
   RuntimeDyldImpl(RTDyldMemoryManager *mm) : MemMgr(mm), HasError(false) {}