llvm-6502/include/llvm/CodeGen/MachineFunction.h
2009-07-31 18:35:51 +00:00

406 lines
15 KiB
C++

//===-- llvm/CodeGen/MachineFunction.h --------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Collect native machine code for a function. This class contains a list of
// MachineBasicBlock instances that make up the current compiled function.
//
// This class also contains pointers to various classes which hold
// target-specific information about the generated code.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_MACHINEFUNCTION_H
#define LLVM_CODEGEN_MACHINEFUNCTION_H
#include "llvm/ADT/ilist.h"
#include "llvm/Support/DebugLoc.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/Recycler.h"
namespace llvm {
class Function;
class MachineRegisterInfo;
class MachineFrameInfo;
class MachineConstantPool;
class MachineJumpTableInfo;
class TargetMachine;
class TargetRegisterClass;
template <>
struct ilist_traits<MachineBasicBlock>
: public ilist_default_traits<MachineBasicBlock> {
mutable ilist_node<MachineBasicBlock> Sentinel;
public:
MachineBasicBlock *createSentinel() const {
return static_cast<MachineBasicBlock*>(&Sentinel);
}
void destroySentinel(MachineBasicBlock *) const {}
MachineBasicBlock *provideInitialHead() const { return createSentinel(); }
MachineBasicBlock *ensureHead(MachineBasicBlock*) const {
return createSentinel();
}
static void noteHead(MachineBasicBlock*, MachineBasicBlock*) {}
void addNodeToList(MachineBasicBlock* MBB);
void removeNodeFromList(MachineBasicBlock* MBB);
void deleteNode(MachineBasicBlock *MBB);
private:
void createNode(const MachineBasicBlock &);
};
/// MachineFunctionInfo - This class can be derived from and used by targets to
/// hold private target-specific information for each MachineFunction. Objects
/// of type are accessed/created with MF::getInfo and destroyed when the
/// MachineFunction is destroyed.
struct MachineFunctionInfo {
virtual ~MachineFunctionInfo() {}
};
class MachineFunction {
Function *Fn;
const TargetMachine &Target;
// RegInfo - Information about each register in use in the function.
MachineRegisterInfo *RegInfo;
// Used to keep track of target-specific per-machine function information for
// the target implementation.
MachineFunctionInfo *MFInfo;
// Keep track of objects allocated on the stack.
MachineFrameInfo *FrameInfo;
// Keep track of constants which are spilled to memory
MachineConstantPool *ConstantPool;
// Keep track of jump tables for switch instructions
MachineJumpTableInfo *JumpTableInfo;
// Function-level unique numbering for MachineBasicBlocks. When a
// MachineBasicBlock is inserted into a MachineFunction is it automatically
// numbered and this vector keeps track of the mapping from ID's to MBB's.
std::vector<MachineBasicBlock*> MBBNumbering;
// Pool-allocate MachineFunction-lifetime and IR objects.
BumpPtrAllocator Allocator;
// Allocation management for instructions in function.
Recycler<MachineInstr> InstructionRecycler;
// Allocation management for basic blocks in function.
Recycler<MachineBasicBlock> BasicBlockRecycler;
// List of machine basic blocks in function
typedef ilist<MachineBasicBlock> BasicBlockListType;
BasicBlockListType BasicBlocks;
// Default debug location. Used to print out the debug label at the beginning
// of a function.
DebugLoc DefaultDebugLoc;
// Tracks debug locations.
DebugLocTracker DebugLocInfo;
// The alignment of the function.
unsigned Alignment;
public:
MachineFunction(Function *Fn, const TargetMachine &TM);
~MachineFunction();
/// getFunction - Return the LLVM function that this machine code represents
///
Function *getFunction() const { return Fn; }
/// getTarget - Return the target machine this machine code is compiled with
///
const TargetMachine &getTarget() const { return Target; }
/// getRegInfo - Return information about the registers currently in use.
///
MachineRegisterInfo &getRegInfo() { return *RegInfo; }
const MachineRegisterInfo &getRegInfo() const { return *RegInfo; }
/// getFrameInfo - Return the frame info object for the current function.
/// This object contains information about objects allocated on the stack
/// frame of the current function in an abstract way.
///
MachineFrameInfo *getFrameInfo() { return FrameInfo; }
const MachineFrameInfo *getFrameInfo() const { return FrameInfo; }
/// getJumpTableInfo - Return the jump table info object for the current
/// function. This object contains information about jump tables for switch
/// instructions in the current function.
///
MachineJumpTableInfo *getJumpTableInfo() { return JumpTableInfo; }
const MachineJumpTableInfo *getJumpTableInfo() const { return JumpTableInfo; }
/// getConstantPool - Return the constant pool object for the current
/// function.
///
MachineConstantPool *getConstantPool() { return ConstantPool; }
const MachineConstantPool *getConstantPool() const { return ConstantPool; }
/// getAlignment - Return the alignment (log2, not bytes) of the function.
///
unsigned getAlignment() const { return Alignment; }
/// setAlignment - Set the alignment (log2, not bytes) of the function.
///
void setAlignment(unsigned A) { Alignment = A; }
/// MachineFunctionInfo - Keep track of various per-function pieces of
/// information for backends that would like to do so.
///
template<typename Ty>
Ty *getInfo() {
if (!MFInfo) {
// This should be just `new (Allocator.Allocate<Ty>()) Ty(*this)', but
// that apparently breaks GCC 3.3.
Ty *Loc = static_cast<Ty*>(Allocator.Allocate(sizeof(Ty),
AlignOf<Ty>::Alignment));
MFInfo = new (Loc) Ty(*this);
}
assert((void*)dynamic_cast<Ty*>(MFInfo) == (void*)MFInfo &&
"Invalid concrete type or multiple inheritence for getInfo");
return static_cast<Ty*>(MFInfo);
}
template<typename Ty>
const Ty *getInfo() const {
return const_cast<MachineFunction*>(this)->getInfo<Ty>();
}
/// getBlockNumbered - MachineBasicBlocks are automatically numbered when they
/// are inserted into the machine function. The block number for a machine
/// basic block can be found by using the MBB::getBlockNumber method, this
/// method provides the inverse mapping.
///
MachineBasicBlock *getBlockNumbered(unsigned N) const {
assert(N < MBBNumbering.size() && "Illegal block number");
assert(MBBNumbering[N] && "Block was removed from the machine function!");
return MBBNumbering[N];
}
/// getNumBlockIDs - Return the number of MBB ID's allocated.
///
unsigned getNumBlockIDs() const { return (unsigned)MBBNumbering.size(); }
/// RenumberBlocks - This discards all of the MachineBasicBlock numbers and
/// recomputes them. This guarantees that the MBB numbers are sequential,
/// dense, and match the ordering of the blocks within the function. If a
/// specific MachineBasicBlock is specified, only that block and those after
/// it are renumbered.
void RenumberBlocks(MachineBasicBlock *MBBFrom = 0);
/// print - Print out the MachineFunction in a format suitable for debugging
/// to the specified stream.
///
void print(std::ostream &OS) const;
void print(std::ostream *OS) const { if (OS) print(*OS); }
/// viewCFG - This function is meant for use from the debugger. You can just
/// say 'call F->viewCFG()' and a ghostview window should pop up from the
/// program, displaying the CFG of the current function with the code for each
/// basic block inside. This depends on there being a 'dot' and 'gv' program
/// in your path.
///
void viewCFG() const;
/// viewCFGOnly - This function is meant for use from the debugger. It works
/// just like viewCFG, but it does not include the contents of basic blocks
/// into the nodes, just the label. If you are only interested in the CFG
/// this can make the graph smaller.
///
void viewCFGOnly() const;
/// dump - Print the current MachineFunction to cerr, useful for debugger use.
///
void dump() const;
// Provide accessors for the MachineBasicBlock list...
typedef BasicBlockListType::iterator iterator;
typedef BasicBlockListType::const_iterator const_iterator;
typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
typedef std::reverse_iterator<iterator> reverse_iterator;
/// addLiveIn - Add the specified physical register as a live-in value and
/// create a corresponding virtual register for it.
unsigned addLiveIn(unsigned PReg, const TargetRegisterClass *RC);
//===--------------------------------------------------------------------===//
// BasicBlock accessor functions.
//
iterator begin() { return BasicBlocks.begin(); }
const_iterator begin() const { return BasicBlocks.begin(); }
iterator end () { return BasicBlocks.end(); }
const_iterator end () const { return BasicBlocks.end(); }
reverse_iterator rbegin() { return BasicBlocks.rbegin(); }
const_reverse_iterator rbegin() const { return BasicBlocks.rbegin(); }
reverse_iterator rend () { return BasicBlocks.rend(); }
const_reverse_iterator rend () const { return BasicBlocks.rend(); }
unsigned size() const { return (unsigned)BasicBlocks.size();}
bool empty() const { return BasicBlocks.empty(); }
const MachineBasicBlock &front() const { return BasicBlocks.front(); }
MachineBasicBlock &front() { return BasicBlocks.front(); }
const MachineBasicBlock & back() const { return BasicBlocks.back(); }
MachineBasicBlock & back() { return BasicBlocks.back(); }
void push_back (MachineBasicBlock *MBB) { BasicBlocks.push_back (MBB); }
void push_front(MachineBasicBlock *MBB) { BasicBlocks.push_front(MBB); }
void insert(iterator MBBI, MachineBasicBlock *MBB) {
BasicBlocks.insert(MBBI, MBB);
}
void splice(iterator InsertPt, iterator MBBI) {
BasicBlocks.splice(InsertPt, BasicBlocks, MBBI);
}
void remove(iterator MBBI) {
BasicBlocks.remove(MBBI);
}
void erase(iterator MBBI) {
BasicBlocks.erase(MBBI);
}
//===--------------------------------------------------------------------===//
// Internal functions used to automatically number MachineBasicBlocks
//
/// getNextMBBNumber - Returns the next unique number to be assigned
/// to a MachineBasicBlock in this MachineFunction.
///
unsigned addToMBBNumbering(MachineBasicBlock *MBB) {
MBBNumbering.push_back(MBB);
return (unsigned)MBBNumbering.size()-1;
}
/// removeFromMBBNumbering - Remove the specific machine basic block from our
/// tracker, this is only really to be used by the MachineBasicBlock
/// implementation.
void removeFromMBBNumbering(unsigned N) {
assert(N < MBBNumbering.size() && "Illegal basic block #");
MBBNumbering[N] = 0;
}
/// CreateMachineInstr - Allocate a new MachineInstr. Use this instead
/// of `new MachineInstr'.
///
MachineInstr *CreateMachineInstr(const TargetInstrDesc &TID,
DebugLoc DL,
bool NoImp = false);
/// CloneMachineInstr - Create a new MachineInstr which is a copy of the
/// 'Orig' instruction, identical in all ways except the the instruction
/// has no parent, prev, or next.
///
MachineInstr *CloneMachineInstr(const MachineInstr *Orig);
/// DeleteMachineInstr - Delete the given MachineInstr.
///
void DeleteMachineInstr(MachineInstr *MI);
/// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this
/// instead of `new MachineBasicBlock'.
///
MachineBasicBlock *CreateMachineBasicBlock(const BasicBlock *bb = 0);
/// DeleteMachineBasicBlock - Delete the given MachineBasicBlock.
///
void DeleteMachineBasicBlock(MachineBasicBlock *MBB);
//===--------------------------------------------------------------------===//
// Debug location.
//
/// getOrCreateDebugLocID - Look up the DebugLocTuple index with the given
/// source file, line, and column. If none currently exists, create a new
/// DebugLocTuple, and insert it into the DebugIdMap.
unsigned getOrCreateDebugLocID(GlobalVariable *CompileUnit,
unsigned Line, unsigned Col);
/// getDebugLocTuple - Get the DebugLocTuple for a given DebugLoc object.
DebugLocTuple getDebugLocTuple(DebugLoc DL) const;
/// getDefaultDebugLoc - Get the default debug location for the machine
/// function.
DebugLoc getDefaultDebugLoc() const { return DefaultDebugLoc; }
/// setDefaultDebugLoc - Get the default debug location for the machine
/// function.
void setDefaultDebugLoc(DebugLoc DL) { DefaultDebugLoc = DL; }
/// getDebugLocInfo - Get the debug info location tracker.
DebugLocTracker &getDebugLocInfo() { return DebugLocInfo; }
};
//===--------------------------------------------------------------------===//
// GraphTraits specializations for function basic block graphs (CFGs)
//===--------------------------------------------------------------------===//
// Provide specializations of GraphTraits to be able to treat a
// machine function as a graph of machine basic blocks... these are
// the same as the machine basic block iterators, except that the root
// node is implicitly the first node of the function.
//
template <> struct GraphTraits<MachineFunction*> :
public GraphTraits<MachineBasicBlock*> {
static NodeType *getEntryNode(MachineFunction *F) {
return &F->front();
}
// nodes_iterator/begin/end - Allow iteration over all nodes in the graph
typedef MachineFunction::iterator nodes_iterator;
static nodes_iterator nodes_begin(MachineFunction *F) { return F->begin(); }
static nodes_iterator nodes_end (MachineFunction *F) { return F->end(); }
};
template <> struct GraphTraits<const MachineFunction*> :
public GraphTraits<const MachineBasicBlock*> {
static NodeType *getEntryNode(const MachineFunction *F) {
return &F->front();
}
// nodes_iterator/begin/end - Allow iteration over all nodes in the graph
typedef MachineFunction::const_iterator nodes_iterator;
static nodes_iterator nodes_begin(const MachineFunction *F) {
return F->begin();
}
static nodes_iterator nodes_end (const MachineFunction *F) {
return F->end();
}
};
// Provide specializations of GraphTraits to be able to treat a function as a
// graph of basic blocks... and to walk it in inverse order. Inverse order for
// a function is considered to be when traversing the predecessor edges of a BB
// instead of the successor edges.
//
template <> struct GraphTraits<Inverse<MachineFunction*> > :
public GraphTraits<Inverse<MachineBasicBlock*> > {
static NodeType *getEntryNode(Inverse<MachineFunction*> G) {
return &G.Graph->front();
}
};
template <> struct GraphTraits<Inverse<const MachineFunction*> > :
public GraphTraits<Inverse<const MachineBasicBlock*> > {
static NodeType *getEntryNode(Inverse<const MachineFunction *> G) {
return &G.Graph->front();
}
};
} // End llvm namespace
#endif