//===- MIParser.h - Machine Instructions Parser ---------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the function that parses the machine instructions.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_LIB_CODEGEN_MIRPARSER_MIPARSER_H
#define LLVM_LIB_CODEGEN_MIRPARSER_MIPARSER_H

#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringRef.h"

namespace llvm {

class BasicBlock;
class MachineBasicBlock;
class MachineInstr;
class MachineFunction;
class MDNode;
struct SlotMapping;
class SMDiagnostic;
class SourceMgr;

struct PerFunctionMIParsingState {
  DenseMap<unsigned, MachineBasicBlock *> MBBSlots;
  DenseMap<unsigned, unsigned> VirtualRegisterSlots;
  DenseMap<unsigned, int> FixedStackObjectSlots;
  DenseMap<unsigned, int> StackObjectSlots;
  DenseMap<unsigned, unsigned> ConstantPoolSlots;
  DenseMap<unsigned, unsigned> JumpTableSlots;
};

/// Parse the machine basic block definitions, and skip the machine
/// instructions.
///
/// This function runs the first parsing pass on the machine function's body.
/// It parses only the machine basic block definitions and creates the machine
/// basic blocks in the given machine function.
///
/// The machine instructions aren't parsed during the first pass because all
/// the machine basic blocks aren't defined yet - this makes it impossible to
/// resolve the machine basic block references.
///
/// Return true if an error occurred.
bool parseMachineBasicBlockDefinitions(MachineFunction &MF, StringRef Src,
                                       PerFunctionMIParsingState &PFS,
                                       const SlotMapping &IRSlots,
                                       SMDiagnostic &Error);

/// Parse the machine instructions.
///
/// This function runs the second parsing pass on the machine function's body.
/// It skips the machine basic block definitions and parses only the machine
/// instructions and basic block attributes like liveins and successors.
///
/// The second parsing pass assumes that the first parsing pass already ran
/// on the given source string.
///
/// Return true if an error occurred.
bool parseMachineInstructions(MachineFunction &MF, StringRef Src,
                              const PerFunctionMIParsingState &PFS,
                              const SlotMapping &IRSlots, SMDiagnostic &Error);

bool parseMBBReference(MachineBasicBlock *&MBB, SourceMgr &SM,
                       MachineFunction &MF, StringRef Src,
                       const PerFunctionMIParsingState &PFS,
                       const SlotMapping &IRSlots, SMDiagnostic &Error);

bool parseNamedRegisterReference(unsigned &Reg, SourceMgr &SM,
                                 MachineFunction &MF, StringRef Src,
                                 const PerFunctionMIParsingState &PFS,
                                 const SlotMapping &IRSlots,
                                 SMDiagnostic &Error);

bool parseVirtualRegisterReference(unsigned &Reg, SourceMgr &SM,
                                   MachineFunction &MF, StringRef Src,
                                   const PerFunctionMIParsingState &PFS,
                                   const SlotMapping &IRSlots,
                                   SMDiagnostic &Error);

bool parseStackObjectReference(int &FI, SourceMgr &SM, MachineFunction &MF,
                               StringRef Src,
                               const PerFunctionMIParsingState &PFS,
                               const SlotMapping &IRSlots, SMDiagnostic &Error);

bool parseMDNode(MDNode *&Node, SourceMgr &SM, MachineFunction &MF,
                 StringRef Src, const PerFunctionMIParsingState &PFS,
                 const SlotMapping &IRSlots, SMDiagnostic &Error);

} // end namespace llvm

#endif