Hook up the MCJIT to the RuntimeDyld library.

Lots of cleanup to make the interfaces prettier, use the JITMemoryManager,
handle multiple functions and modules, etc.. This gets far enough that
the MCJIT compiles and runs code, though.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128052 91177308-0d34-0410-b5e6-96231b3b80d8

lib/ExecutionEngine/MCJIT/MCJIT.cpp

@@ -11,8 +11,11 @@
 #include "llvm/Function.h"
 #include "llvm/ExecutionEngine/GenericValue.h"
 #include "llvm/ExecutionEngine/MCJIT.h"
+#include "llvm/ExecutionEngine/JITMemoryManager.h"
+#include "llvm/MC/MCAsmInfo.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/DynamicLibrary.h"
+#include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Target/TargetData.h"
 
 using namespace llvm;
@@ -81,6 +84,12 @@ MCJIT::MCJIT(Module *m, TargetMachine *tm, TargetJITInfo &tji,
   PM.run(*M);
   // Flush the output buffer so the SmallVector gets its data.
   OS.flush();
+
+  // Load the object into the dynamic linker.
+  // FIXME: It would be nice to avoid making yet another copy.
+  MemoryBuffer *MB = MemoryBuffer::getMemBufferCopy(StringRef(Buffer.data(),
+                                                              Buffer.size()));
+  Dyld.loadObject(MB);
 }
 
 MCJIT::~MCJIT() {
@@ -92,7 +101,8 @@ void *MCJIT::getPointerToBasicBlock(BasicBlock *BB) {
 }
 
 void *MCJIT::getPointerToFunction(Function *F) {
-  return 0;
+  Twine Name = TM->getMCAsmInfo()->getGlobalPrefix() + F->getName();
+  return Dyld.getSymbolAddress(Name.str());
 }
 
 void *MCJIT::recompileAndRelinkFunction(Function *F) {

lib/ExecutionEngine/MCJIT/MCJIT.h

@@ -12,6 +12,7 @@
 
 #include "llvm/PassManager.h"
 #include "llvm/ExecutionEngine/ExecutionEngine.h"
+#include "llvm/ExecutionEngine/RuntimeDyld.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/raw_ostream.h"
 
@@ -37,6 +38,8 @@ class MCJIT : public ExecutionEngine {
   SmallVector<char, 4096> Buffer; // Working buffer into which we JIT.
   raw_svector_ostream OS;
 
+  RuntimeDyld Dyld;
+
 public:
   ~MCJIT();
 

lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp

@@ -145,6 +145,10 @@ loadSegment32(const MachOObject *Obj,
     SymbolTable[Name] = Address;
   }
 
+  // We've loaded the section; now mark the functions in it as executable.
+  // FIXME: We really should use the JITMemoryManager for this.
+  sys::Memory::setRangeExecutable(Data.base(), Data.size());
+
   delete SectionBases;
   return false;
 }
@@ -220,12 +224,14 @@ loadSegment64(const MachOObject *Obj,
     SymbolTable[Name] = Address;
   }
 
+  // We've loaded the section; now mark the functions in it as executable.
+  // FIXME: We really should use the JITMemoryManager for this.
+  sys::Memory::setRangeExecutable(Data.base(), Data.size());
+
   delete SectionBases;
   return false;
 }
 
-
-
 bool RuntimeDyldImpl::loadObject(MemoryBuffer *InputBuffer) {
   // If the linker is in an error state, don't do anything.
   if (hasError())