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//===-- 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 FUNCTIONLOWERINGINFO_H
#define FUNCTIONLOWERINGINFO_H
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/DenseMap.h"
#ifndef NDEBUG
#include "llvm/ADT/SmallSet.h"
#endif
#include "llvm/CodeGen/ValueTypes.h"
#include <vector>
namespace llvm {
class AllocaInst;
class BasicBlock;
class CallInst;
class Function;
class GlobalVariable;
class Instruction;
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:
TargetLowering &TLI;
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;
explicit FunctionLoweringInfo(TargetLowering &TLI);
/// set - Initialize this FunctionLoweringInfo with the given Function
/// and its associated MachineFunction.
///
void set(Function &Fn, MachineFunction &MF, bool EnableFastISel);
/// 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;
#ifndef NDEBUG
SmallSet<Instruction*, 8> CatchInfoLost;
SmallSet<Instruction*, 8> CatchInfoFound;
#endif
unsigned MakeReg(EVT VT);
/// isExportedInst - Return true if the specified value is an instruction
/// exported from its block.
bool isExportedInst(const Value *V) {
return ValueMap.count(V);
}
unsigned CreateRegForValue(const Value *V);
unsigned InitializeRegForValue(const Value *V) {
unsigned &R = ValueMap[V];
assert(R == 0 && "Already initialized this value register!");
return R = CreateRegForValue(V);
}
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;
/// 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();
};
/// ComputeLinearIndex - Given an LLVM IR aggregate type and a sequence
/// of insertvalue or extractvalue indices that identify a member, return
/// the linearized index of the start of the member.
///
unsigned ComputeLinearIndex(const TargetLowering &TLI, const Type *Ty,
const unsigned *Indices,
const unsigned *IndicesEnd,
unsigned CurIndex = 0);
/// ComputeValueVTs - Given an LLVM IR type, compute a sequence of
/// EVTs that represent all the individual underlying
/// non-aggregate types that comprise it.
///
/// If Offsets is non-null, it points to a vector to be filled in
/// with the in-memory offsets of each of the individual values.
///
void ComputeValueVTs(const TargetLowering &TLI, const Type *Ty,
SmallVectorImpl<EVT> &ValueVTs,
SmallVectorImpl<uint64_t> *Offsets = 0,
uint64_t StartingOffset = 0);
/// ExtractTypeInfo - Returns the type info, possibly bitcast, encoded in V.
GlobalVariable *ExtractTypeInfo(Value *V);
/// AddCatchInfo - Extract the personality and type infos from an eh.selector
/// call, and add them to the specified machine basic block.
void AddCatchInfo(CallInst &I, MachineModuleInfo *MMI, MachineBasicBlock *MBB);
/// CopyCatchInfo - Copy catch information from DestBB to SrcBB.
void CopyCatchInfo(BasicBlock *SrcBB, BasicBlock *DestBB,
MachineModuleInfo *MMI, FunctionLoweringInfo &FLI);
} // end namespace llvm
#endif
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