From a230202d5ef804287a6b09c23787ed8e6a2f4f86 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Fri, 1 Jul 2011 22:25:04 +0000
Subject: [PATCH] Add MCSubtargetInfo target registry stuff.

llvm-svn: 134279
---
 include/llvm/Target/TargetRegistry.h          | 63 +++++++++++++++++++
 lib/Target/X86/MCTargetDesc/X86TargetDesc.cpp | 28 +++++++++
 2 files changed, 91 insertions(+)

diff --git a/include/llvm/Target/TargetRegistry.h b/include/llvm/Target/TargetRegistry.h
index 8d44f666c57..2e79488ecbb 100644
--- a/include/llvm/Target/TargetRegistry.h
+++ b/include/llvm/Target/TargetRegistry.h
@@ -35,6 +35,7 @@ namespace llvm {
   class MCInstPrinter;
   class MCInstrInfo;
   class MCRegisterInfo;
+  class MCSubtargetInfo;
   class MCStreamer;
   class TargetAsmBackend;
   class TargetAsmLexer;
@@ -69,6 +70,7 @@ namespace llvm {
                                           StringRef TT);
     typedef MCInstrInfo *(*MCInstrInfoCtorFnTy)(void);
     typedef MCRegisterInfo *(*MCRegInfoCtorFnTy)(void);
+    typedef MCSubtargetInfo *(*MCSubtargetInfoCtorFnTy)(void);
     typedef TargetMachine *(*TargetMachineCtorTy)(const Target &T,
                                                   const std::string &TT,
                                                   const std::string &CPU,
@@ -137,6 +139,10 @@ namespace llvm {
     /// if registered.
     MCRegInfoCtorFnTy MCRegInfoCtorFn;
 
+    /// MCSubtargetInfoCtorFn - Constructor function for this target's
+    /// MCSubtargetInfo, if registered.
+    MCSubtargetInfoCtorFnTy MCSubtargetInfoCtorFn;
+
     /// TargetMachineCtorFn - Construction function for this target's
     /// TargetMachine, if registered.
     TargetMachineCtorTy TargetMachineCtorFn;
@@ -262,6 +268,14 @@ namespace llvm {
       return MCRegInfoCtorFn();
     }
 
+    /// createMCSubtargetInfo - Create a MCSubtargetInfo implementation.
+    ///
+    MCSubtargetInfo *createMCSubtargetInfo() const {
+      if (!MCSubtargetInfoCtorFn)
+        return 0;
+      return MCSubtargetInfoCtorFn();
+    }
+
     /// createTargetMachine - Create a target specific machine implementation
     /// for the specified \arg Triple.
     ///
@@ -506,6 +520,22 @@ namespace llvm {
         T.MCRegInfoCtorFn = Fn;
     }
 
+    /// RegisterMCSubtargetInfo - Register a MCSubtargetInfo implementation for
+    /// the given target.
+    ///
+    /// Clients are responsible for ensuring that registration doesn't occur
+    /// while another thread is attempting to access the registry. Typically
+    /// this is done by initializing all targets at program startup.
+    ///
+    /// @param T - The target being registered.
+    /// @param Fn - A function to construct a MCSubtargetInfo for the target.
+    static void RegisterMCSubtargetInfo(Target &T,
+                                        Target::MCSubtargetInfoCtorFnTy Fn) {
+      // Ignore duplicate registration.
+      if (!T.MCSubtargetInfoCtorFn)
+        T.MCSubtargetInfoCtorFn = Fn;
+    }
+
     /// RegisterTargetMachine - Register a TargetMachine implementation for the
     /// given target.
     ///
@@ -782,6 +812,39 @@ namespace llvm {
     }
   };
 
+  /// RegisterMCSubtargetInfo - Helper template for registering a target
+  /// subtarget info implementation.  This invokes the static "Create" method
+  /// on the class to actually do the construction.  Usage:
+  ///
+  /// extern "C" void LLVMInitializeFooTarget() {
+  ///   extern Target TheFooTarget;
+  ///   RegisterMCSubtargetInfo<FooMCSubtargetInfo> X(TheFooTarget);
+  /// }
+  template<class MCSubtargetInfoImpl>
+  struct RegisterMCSubtargetInfo {
+    RegisterMCSubtargetInfo(Target &T) {
+      TargetRegistry::RegisterMCSubtargetInfo(T, &Allocator);
+    }
+  private:
+    static MCSubtargetInfo *Allocator() {
+      return new MCSubtargetInfoImpl();
+    }
+  };
+
+  /// RegisterMCSubtargetInfoFn - Helper template for registering a target
+  /// subtarget info implementation.  This invokes the specified function to
+  /// do the construction.  Usage:
+  ///
+  /// extern "C" void LLVMInitializeFooTarget() {
+  ///   extern Target TheFooTarget;
+  ///   RegisterMCSubtargetInfoFn X(TheFooTarget, TheFunction);
+  /// }
+  struct RegisterMCSubtargetInfoFn {
+    RegisterMCSubtargetInfoFn(Target &T, Target::MCSubtargetInfoCtorFnTy Fn) {
+      TargetRegistry::RegisterMCSubtargetInfo(T, Fn);
+    }
+  };
+
   /// RegisterTargetMachine - Helper template for registering a target machine
   /// implementation, for use in the target machine initialization
   /// function. Usage:
diff --git a/lib/Target/X86/MCTargetDesc/X86TargetDesc.cpp b/lib/Target/X86/MCTargetDesc/X86TargetDesc.cpp
index 44d10979ca2..b55cfdc2f82 100644
--- a/lib/Target/X86/MCTargetDesc/X86TargetDesc.cpp
+++ b/lib/Target/X86/MCTargetDesc/X86TargetDesc.cpp
@@ -14,6 +14,7 @@
 #include "X86TargetDesc.h"
 #include "llvm/MC/MCInstrInfo.h"
 #include "llvm/MC/MCRegisterInfo.h"
+#include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/Target/TargetRegistry.h"
 
 #define GET_REGINFO_MC_DESC
@@ -22,6 +23,9 @@
 #define GET_INSTRINFO_MC_DESC
 #include "X86GenInstrInfo.inc"
 
+#define GET_SUBTARGETINFO_MC_DESC
+#include "X86GenSubtarget.inc"
+
 using namespace llvm;
 
 MCInstrInfo *createX86MCInstrInfo() {
@@ -36,7 +40,21 @@ MCRegisterInfo *createX86MCRegisterInfo() {
   return X;
 }
 
+MCSubtargetInfo *createX86MCSubtargetInfo() {
+  MCSubtargetInfo *X = new MCSubtargetInfo();
+  InitX86MCSubtargetInfo(X);
+  return X;
+}
+
 // Force static initialization.
+extern "C" void LLVMInitializeX86MCInstrInfo() {
+  RegisterMCInstrInfo<MCInstrInfo> X(TheX86_32Target);
+  RegisterMCInstrInfo<MCInstrInfo> Y(TheX86_64Target);
+
+  TargetRegistry::RegisterMCInstrInfo(TheX86_32Target, createX86MCInstrInfo);
+  TargetRegistry::RegisterMCInstrInfo(TheX86_64Target, createX86MCInstrInfo);
+}
+
 extern "C" void LLVMInitializeX86MCRegInfo() {
   RegisterMCRegInfo<MCRegisterInfo> X(TheX86_32Target);
   RegisterMCRegInfo<MCRegisterInfo> Y(TheX86_64Target);
@@ -44,3 +62,13 @@ extern "C" void LLVMInitializeX86MCRegInfo() {
   TargetRegistry::RegisterMCRegInfo(TheX86_32Target, createX86MCRegisterInfo);
   TargetRegistry::RegisterMCRegInfo(TheX86_64Target, createX86MCRegisterInfo);
 }
+
+extern "C" void LLVMInitializeX86MCSubtargetInfo() {
+  RegisterMCSubtargetInfo<MCSubtargetInfo> X(TheX86_32Target);
+  RegisterMCSubtargetInfo<MCSubtargetInfo> Y(TheX86_64Target);
+
+  TargetRegistry::RegisterMCSubtargetInfo(TheX86_32Target,
+                                          createX86MCSubtargetInfo);
+  TargetRegistry::RegisterMCSubtargetInfo(TheX86_64Target,
+                                          createX86MCSubtargetInfo);
+}