Rip JIT specific stuff out of TargetMachine, as per PR176

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10542 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 54 insertions, 0 deletions

diff --git a/include/llvm/Target/TargetJITInfo.h b/include/llvm/Target/TargetJITInfo.h
new file mode 100644
index 0000000000..90fea4e3c3
--- /dev/null
+++ b/include/llvm/Target/TargetJITInfo.h
@@ -0,0 +1,54 @@
+//===- Target/TargetJITInfo.h - Target Information for JIT ------*- C++ -*-===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file exposes an abstract interface used by the Just-In-Time code
+// generator to perform target-specific activities, such as emitting stubs.  If
+// a TargetMachine supports JIT code generation, it should provide one of these
+// objects through the getJITInfo() method.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TARGET_TARGETJITINFO_H
+#define LLVM_TARGET_TARGETJITINFO_H
+
+namespace llvm {
+  class Function;
+  class FunctionPassManager;
+  class MachineCodeEmitter;
+
+  /// TargetJITInfo - Target specific information required by the Just-In-Time
+  /// code generator.
+  struct TargetJITInfo {
+    virtual ~TargetJITInfo() {}
+    
+    /// addPassesToJITCompile - Add passes to the specified pass manager to
+    /// implement a fast code generator for this target.
+    ///
+    virtual void addPassesToJITCompile(FunctionPassManager &PM) = 0;
+    
+    /// replaceMachineCodeForFunction - Make it so that calling the function
+    /// whose machine code is at OLD turns into a call to NEW, perhaps by
+    /// overwriting OLD with a branch to NEW.  This is used for self-modifying
+    /// code.
+    ///
+    virtual void replaceMachineCodeForFunction (void *Old, void *New) = 0;
+    
+    /// getJITStubForFunction - Create or return a stub for the specified
+    /// function.  This stub acts just like the specified function, except that
+    /// it allows the "address" of the function to be taken without having to
+    /// generate code for it.  Targets do not need to implement this method, but
+    /// doing so will allow for faster startup of the JIT.
+    ///
+    virtual void *getJITStubForFunction(Function *F, MachineCodeEmitter &MCE) {
+      return 0;
+    }
+  };
+} // End llvm namespace
+
+#endif