Introducing plugable register allocators and instruction schedulers.

llvm-svn: 29434

llvm/lib/CodeGen/Passes.cpp

@@ -12,74 +12,31 @@
 //
 //===---------------------------------------------------------------------===//
 
+#include "llvm/CodeGen/MachinePassRegistry.h"
 #include "llvm/CodeGen/Passes.h"
-#include "llvm/Pass.h"
 #include "llvm/Support/CommandLine.h"
 #include <iostream>
+
 using namespace llvm;
 
 namespace {
-  enum RegAllocName { simple, local, linearscan };
-
-  static cl::opt<RegAllocName>
-  RegAlloc(
-    "regalloc",
-    cl::desc("Register allocator to use: (default = linearscan)"),
-    cl::Prefix,
-    cl::values(
-       clEnumVal(simple,        "  simple register allocator"),
-       clEnumVal(local,         "  local register allocator"),
-       clEnumVal(linearscan,    "  linear scan register allocator"),
-       clEnumValEnd),
-    cl::init(linearscan));
+  cl::opt<const char *, false, RegisterPassParser<RegisterRegAlloc> >
+  RegAlloc("regalloc",
+           cl::init("linearscan"),
+           cl::desc("Register allocator to use: (default = linearscan)")); 
 }
 
-
-RegisterRegAlloc *RegisterRegAlloc::List = NULL;
-
-/// Find - Finds a register allocator in registration list.
-///
-RegisterRegAlloc::FunctionPassCtor RegisterRegAlloc::Find(const char *N) {
-  for (RegisterRegAlloc *RA = List; RA; RA = RA->Next) {
-    if (strcmp(N, RA->Name) == 0) return RA->Ctor;
-  }
-  return NULL;
-}
-
-
-#ifndef NDEBUG  
-void RegisterRegAlloc::print() {
-  for (RegisterRegAlloc *RA = List; RA; RA = RA->Next) {
-    std::cerr << "RegAlloc:" << RA->Name << "\n";
-  }
-}
-#endif
-
-
-static RegisterRegAlloc
-  simpleRegAlloc("simple", "  simple register allocator",
-                 createSimpleRegisterAllocator);
-
-static RegisterRegAlloc
-  localRegAlloc("local", "  local register allocator",
-                createLocalRegisterAllocator);
-
-static RegisterRegAlloc
-  linearscanRegAlloc("linearscan", "linear scan register allocator",
-                     createLinearScanRegisterAllocator);
-
-
 FunctionPass *llvm::createRegisterAllocator() {
-  const char *Names[] = {"simple", "local", "linearscan"};
-  const char *DefltName = "linearscan";
+  RegisterRegAlloc::FunctionPassCtor Ctor = RegisterRegAlloc::getCache();
+  
+  if (!Ctor) {
+    Ctor = RegisterRegAlloc::FindCtor(RegAlloc);
+    assert(Ctor && "No register allocator found");
+    if (!Ctor) Ctor = RegisterRegAlloc::FirstCtor();
+    RegisterRegAlloc::setCache(Ctor);
+  }
   
-  RegisterRegAlloc::FunctionPassCtor Ctor =
-                    RegisterRegAlloc::Find(Names[RegAlloc]);
-  if (!Ctor) Ctor = RegisterRegAlloc::Find(DefltName);
-
   assert(Ctor && "No register allocator found");
   
   return Ctor();
 }
-
-