Initial checkin of new LLI with JIT compiler

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5126 91177308-0d34-0410-b5e6-96231b3b80d8

lib/ExecutionEngine/JIT/JIT.cpp

@@ -0,0 +1,53 @@
+//===-- JIT.cpp - LLVM Just in Time Compiler ------------------------------===//
+//
+// This file implements the top-level support for creating a Just-In-Time
+// compiler for the current architecture.
+//
+//===----------------------------------------------------------------------===//
+
+#include "VM.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetMachineImpls.h"
+#include "llvm/Module.h"
+
+
+/// createJIT - Create an return a new JIT compiler if there is one available
+/// for the current target.  Otherwise it returns null.
+///
+ExecutionEngine *ExecutionEngine::createJIT(Module *M, unsigned Config) {
+  // FIXME: This should be controlled by which subdirectory gets linked in!
+#if !defined(i386) && !defined(__i386__) && !defined(__x86__)
+  return 0;
+#endif
+  // Allocate a target... in the future this will be controllable on the
+  // command line.
+  TargetMachine *Target = allocateX86TargetMachine(Config);
+  assert(Target && "Could not allocate X86 target machine!");
+
+  // Create the virtual machine object...
+  return new VM(M, Target);
+}
+
+VM::VM(Module *M, TargetMachine *tm) : ExecutionEngine(M), TM(*tm) {
+  setTargetData(TM.getTargetData());
+  MCE = createEmitter(*this);  // Initialize MCE
+  setupPassManager();
+  registerCallback();
+}
+
+int VM::run(const std::string &FnName, const std::vector<std::string> &Args) {
+  Function *F = getModule().getNamedFunction(FnName);
+  if (F == 0) {
+    std::cerr << "Could not find function '" << FnName <<"' in module!\n";
+    return 1;
+  }
+
+  int(*PF)(int, char**) = (int(*)(int, char**))getPointerToFunction(F);
+  assert(PF != 0 && "Null pointer to function?");
+
+  // Build an argv vector...
+  char **Argv = (char**)CreateArgv(Args);
+
+  // Call the main function...
+  return PF(Args.size(), Argv);
+}