new file

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30082 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/LLVMTargetMachine.cpp

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+//===-- LLVMTargetMachine.cpp - Implement the LLVMTargetMachine class -----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Chris Lattner and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the LLVMTargetMachine class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/PassManager.h"
+#include "llvm/Pass.h"
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Transforms/Scalar.h"
+#include <iostream>
+using namespace llvm;
+
+bool LLVMTargetMachine::addPassesToEmitFile(FunctionPassManager &PM,
+                                            std::ostream &Out,
+                                            CodeGenFileType FileType,
+                                            bool Fast) {
+  // Standard LLVM-Level Passes.
+  
+  // Run loop strength reduction before anything else.
+  if (!Fast) PM.add(createLoopStrengthReducePass(getTargetLowering()));
+  
+  // FIXME: Implement efficient support for garbage collection intrinsics.
+  PM.add(createLowerGCPass());
+  
+  // FIXME: Implement the invoke/unwind instructions!
+  PM.add(createLowerInvokePass());
+  
+  // Make sure that no unreachable blocks are instruction selected.
+  PM.add(createUnreachableBlockEliminationPass());
+  
+  
+  // Ask the target for an isel.
+  if (addInstSelector(PM, Fast))
+    return true;
+  
+  
+  // Print the instruction selected machine code...
+  if (PrintMachineCode)
+    PM.add(createMachineFunctionPrinterPass(&std::cerr));
+  
+  // Perform register allocation to convert to a concrete x86 representation
+  PM.add(createRegisterAllocator());
+  
+  if (PrintMachineCode)
+    PM.add(createMachineFunctionPrinterPass(&std::cerr));
+  
+  
+  // Run post-ra passes.
+  if (addPostRegAlloc(PM, Fast) && PrintMachineCode)
+    PM.add(createMachineFunctionPrinterPass(&std::cerr));
+  
+  
+  // Insert prolog/epilog code.  Eliminate abstract frame index references...
+  PM.add(createPrologEpilogCodeInserter());
+  
+  if (PrintMachineCode)  // Print the register-allocated code
+    PM.add(createMachineFunctionPrinterPass(&std::cerr));
+  
+  
+  if (addPreEmitPass(PM, Fast) && PrintMachineCode)
+    PM.add(createMachineFunctionPrinterPass(&std::cerr));
+  
+  
+  switch (FileType) {
+    default: return true;
+    case TargetMachine::AssemblyFile:
+      if (addAssemblyEmitter(PM, Fast, Out))
+        return true;
+      break;
+    case TargetMachine::ObjectFile:
+      if (addObjectWriter(PM, Fast, Out))
+        return true;
+      break;
+  }
+  
+  // Delete machine code for this function
+  PM.add(createMachineCodeDeleter());
+  
+  return false; // success!
+}
+
+/// addPassesToEmitMachineCode - Add passes to the specified pass manager to
+/// get machine code emitted.  This uses a MachineCodeEmitter object to handle
+/// actually outputting the machine code and resolving things like the address
+/// of functions.  This method should returns true if machine code emission is
+/// not supported.
+///
+bool LLVMTargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
+                                                   MachineCodeEmitter &MCE,
+                                                   bool Fast) {
+  // Standard LLVM-Level Passes.
+  
+  // Run loop strength reduction before anything else.
+  if (!Fast) PM.add(createLoopStrengthReducePass(getTargetLowering()));
+  
+  // FIXME: Implement efficient support for garbage collection intrinsics.
+  PM.add(createLowerGCPass());
+  
+  // FIXME: Implement the invoke/unwind instructions!
+  PM.add(createLowerInvokePass());
+  
+  // Make sure that no unreachable blocks are instruction selected.
+  PM.add(createUnreachableBlockEliminationPass());
+  
+  
+  // Ask the target for an isel.
+  if (addInstSelector(PM, Fast))
+    return true;
+  
+  
+  // Print the instruction selected machine code...
+  if (PrintMachineCode)
+    PM.add(createMachineFunctionPrinterPass(&std::cerr));
+  
+  // Perform register allocation to convert to a concrete x86 representation
+  PM.add(createRegisterAllocator());
+  
+  if (PrintMachineCode)
+    PM.add(createMachineFunctionPrinterPass(&std::cerr));
+  
+  
+  // Run post-ra passes.
+  if (addPostRegAlloc(PM, Fast) && PrintMachineCode)
+    PM.add(createMachineFunctionPrinterPass(&std::cerr));
+  
+  
+  // Insert prolog/epilog code.  Eliminate abstract frame index references...
+  PM.add(createPrologEpilogCodeInserter());
+  
+  if (PrintMachineCode)  // Print the register-allocated code
+    PM.add(createMachineFunctionPrinterPass(&std::cerr));
+  
+  
+  if (addPreEmitPass(PM, Fast) && PrintMachineCode)
+    PM.add(createMachineFunctionPrinterPass(&std::cerr));
+  
+  
+  addCodeEmitter(PM, Fast, MCE);
+  
+  // Delete machine code for this function
+  PM.add(createMachineCodeDeleter());
+  
+  return false; // success!
+}