From 4c3fd9f92f89810d659973d2666ab729758de64a Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Wed, 7 Jul 2010 16:01:37 +0000
Subject: Move FunctionLoweringInfo.h out into include/llvm/CodeGen. This will
 allow target-specific fast-isel code to make use of it directly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107787 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/CodeGen/FunctionLoweringInfo.h | 144 ++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 include/llvm/CodeGen/FunctionLoweringInfo.h

(limited to 'include/llvm/CodeGen')

diff --git a/include/llvm/CodeGen/FunctionLoweringInfo.h b/include/llvm/CodeGen/FunctionLoweringInfo.h
new file mode 100644
index 0000000..011d4261
--- /dev/null
+++ b/include/llvm/CodeGen/FunctionLoweringInfo.h
@@ -0,0 +1,144 @@
+//===-- FunctionLoweringInfo.h - Lower functions from LLVM IR to CodeGen --===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This implements routines for translating functions from LLVM IR into
+// Machine IR.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_FUNCTIONLOWERINGINFO_H
+#define LLVM_CODEGEN_FUNCTIONLOWERINGINFO_H
+
+#include "llvm/InlineAsm.h"
+#include "llvm/Instructions.h"
+#include "llvm/ADT/APInt.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallVector.h"
+#ifndef NDEBUG
+#include "llvm/ADT/SmallSet.h"
+#endif
+#include "llvm/CodeGen/ValueTypes.h"
+#include "llvm/CodeGen/ISDOpcodes.h"
+#include "llvm/Support/CallSite.h"
+#include <vector>
+
+namespace llvm {
+
+class AllocaInst;
+class BasicBlock;
+class CallInst;
+class Function;
+class GlobalVariable;
+class Instruction;
+class MachineInstr;
+class MachineBasicBlock;
+class MachineFunction;
+class MachineModuleInfo;
+class MachineRegisterInfo;
+class TargetLowering;
+class Value;
+
+//===--------------------------------------------------------------------===//
+/// FunctionLoweringInfo - This contains information that is global to a
+/// function that is used when lowering a region of the function.
+///
+class FunctionLoweringInfo {
+public:
+  const TargetLowering &TLI;
+  const Function *Fn;
+  MachineFunction *MF;
+  MachineRegisterInfo *RegInfo;
+
+  /// CanLowerReturn - true iff the function's return value can be lowered to
+  /// registers.
+  bool CanLowerReturn;
+
+  /// DemoteRegister - if CanLowerReturn is false, DemoteRegister is a vreg
+  /// allocated to hold a pointer to the hidden sret parameter.
+  unsigned DemoteRegister;
+
+  /// MBBMap - A mapping from LLVM basic blocks to their machine code entry.
+  DenseMap<const BasicBlock*, MachineBasicBlock *> MBBMap;
+
+  /// ValueMap - Since we emit code for the function a basic block at a time,
+  /// we must remember which virtual registers hold the values for
+  /// cross-basic-block values.
+  DenseMap<const Value*, unsigned> ValueMap;
+
+  /// StaticAllocaMap - Keep track of frame indices for fixed sized allocas in
+  /// the entry block.  This allows the allocas to be efficiently referenced
+  /// anywhere in the function.
+  DenseMap<const AllocaInst*, int> StaticAllocaMap;
+
+  /// ArgDbgValues - A list of DBG_VALUE instructions created during isel for
+  /// function arguments that are inserted after scheduling is completed.
+  SmallVector<MachineInstr*, 8> ArgDbgValues;
+
+#ifndef NDEBUG
+  SmallSet<const Instruction *, 8> CatchInfoLost;
+  SmallSet<const Instruction *, 8> CatchInfoFound;
+#endif
+
+  struct LiveOutInfo {
+    unsigned NumSignBits;
+    APInt KnownOne, KnownZero;
+    LiveOutInfo() : NumSignBits(0), KnownOne(1, 0), KnownZero(1, 0) {}
+  };
+  
+  /// LiveOutRegInfo - Information about live out vregs, indexed by their
+  /// register number offset by 'FirstVirtualRegister'.
+  std::vector<LiveOutInfo> LiveOutRegInfo;
+
+  /// PHINodesToUpdate - A list of phi instructions whose operand list will
+  /// be updated after processing the current basic block.
+  /// TODO: This isn't per-function state, it's per-basic-block state. But
+  /// there's no other convenient place for it to live right now.
+  std::vector<std::pair<MachineInstr*, unsigned> > PHINodesToUpdate;
+
+  explicit FunctionLoweringInfo(const TargetLowering &TLI);
+
+  /// set - Initialize this FunctionLoweringInfo with the given Function
+  /// and its associated MachineFunction.
+  ///
+  void set(const Function &Fn, MachineFunction &MF);
+
+  /// clear - Clear out all the function-specific state. This returns this
+  /// FunctionLoweringInfo to an empty state, ready to be used for a
+  /// different function.
+  void clear();
+
+  /// isExportedInst - Return true if the specified value is an instruction
+  /// exported from its block.
+  bool isExportedInst(const Value *V) {
+    return ValueMap.count(V);
+  }
+
+  unsigned CreateReg(EVT VT);
+  
+  unsigned CreateRegs(const Type *Ty);
+  
+  unsigned InitializeRegForValue(const Value *V) {
+    unsigned &R = ValueMap[V];
+    assert(R == 0 && "Already initialized this value register!");
+    return R = CreateRegs(V->getType());
+  }
+};
+
+/// AddCatchInfo - Extract the personality and type infos from an eh.selector
+/// call, and add them to the specified machine basic block.
+void AddCatchInfo(const CallInst &I,
+                  MachineModuleInfo *MMI, MachineBasicBlock *MBB);
+
+/// CopyCatchInfo - Copy catch information from DestBB to SrcBB.
+void CopyCatchInfo(const BasicBlock *SrcBB, const BasicBlock *DestBB,
+                   MachineModuleInfo *MMI, FunctionLoweringInfo &FLI);
+
+} // end namespace llvm
+
+#endif
-- 
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