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//===-- llvm/CodeGen/MachineFunction.h --------------------------*- C++ -*-===//
//
// Collect native machine code information for a method. This allows
// target-specific information about the generated code to be stored with each
// method.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_MACHINEFUNCTION_H
#define LLVM_CODEGEN_MACHINEFUNCTION_H
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/Annotation.h"
#include "Support/HashExtras.h"
#include "Support/hash_set"
#include "Support/ilist"
class Value;
class Function;
class Constant;
class Type;
class TargetMachine;
class Pass;
class SSARegMap;
Pass *createMachineCodeConstructionPass(TargetMachine &Target);
Pass *createMachineCodeDestructionPass();
Pass *createMachineFunctionPrinterPass();
class MachineFunction : private Annotation {
const Function *Fn;
const TargetMachine &Target;
// List of machine basic blocks in function
iplist<MachineBasicBlock> BasicBlocks;
// Keeping track of mapping from SSA values to registers
SSARegMap *SSARegMapping;
// FIXME: State should be held elsewhere...
hash_set<const Constant*> constantsForConstPool;
hash_map<const Value*, int> offsets;
unsigned staticStackSize;
unsigned automaticVarsSize;
unsigned regSpillsSize;
unsigned maxOptionalArgsSize;
unsigned maxOptionalNumArgs;
unsigned currentTmpValuesSize;
unsigned maxTmpValuesSize;
bool compiledAsLeaf;
bool spillsAreaFrozen;
bool automaticVarsAreaFrozen;
public:
MachineFunction(const Function *Fn, const TargetMachine& target);
~MachineFunction();
/// getFunction - Return the LLVM function that this machine code represents
///
const Function *getFunction() const { return Fn; }
/// getTarget - Return the target machine this machine code is compiled with
///
const TargetMachine &getTarget() const { return Target; }
/// print - Print out the MachineFunction in a format suitable for debugging
/// to the specified stream.
///
void print(std::ostream &OS) const;
/// dump - Print the current MachineFunction to cerr, useful for debugger use.
///
void dump() const;
// The next three methods are used to construct, destruct, and retrieve the
// MachineFunction object for the given method.
//
// construct() -- Allocates and initializes for a given method and target
// get() -- Returns a handle to the object.
// This should not be called before "construct()"
// for a given Method.
// destruct() -- Destroy the MachineFunction object
//
static MachineFunction& construct(const Function *Fn,
const TargetMachine &target);
static void destruct(const Function *F);
static MachineFunction& get(const Function *F);
// Provide accessors for the MachineBasicBlock list...
typedef iplist<MachineBasicBlock> BasicBlockListType;
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;
// Provide accessors for basic blocks...
const BasicBlockListType &getBasicBlockList() const { return BasicBlocks; }
BasicBlockListType &getBasicBlockList() { return BasicBlocks; }
//===--------------------------------------------------------------------===//
// BasicBlock iterator forwarding 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 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(); }
//===--------------------------------------------------------------------===//
// SSARegMap Interface... Keep track of information about each SSA virtual
// register, such as which register class it belongs to.
//
SSARegMap *getSSARegMap() const { return SSARegMapping; }
void clearSSARegMap();
//===--------------------------------------------------------------------===//
//
// FIXME: Most of the following state should be moved into another class!
//
/// CalculateArgSize - Call this method to fill in the maxOptionalArgsSize &
/// staticStackSize fields...
///
void CalculateArgSize();
//
// Accessors for global information about generated code for a method.
//
inline bool isCompiledAsLeafMethod() const { return compiledAsLeaf; }
inline unsigned getStaticStackSize() const { return staticStackSize; }
inline unsigned getAutomaticVarsSize() const { return automaticVarsSize; }
inline unsigned getRegSpillsSize() const { return regSpillsSize; }
inline unsigned getMaxOptionalArgsSize() const { return maxOptionalArgsSize;}
inline unsigned getMaxOptionalNumArgs() const { return maxOptionalNumArgs;}
inline const hash_set<const Constant*>&
getConstantPoolValues() const {return constantsForConstPool;}
//
// Modifiers used during code generation
//
void initializeFrameLayout (const TargetMachine& target);
void addToConstantPool (const Constant* constVal)
{ constantsForConstPool.insert(constVal); }
inline void markAsLeafMethod() { compiledAsLeaf = true; }
int computeOffsetforLocalVar (const TargetMachine& target,
const Value* local,
unsigned int& getPaddedSize,
unsigned int sizeToUse = 0);
int allocateLocalVar (const TargetMachine& target,
const Value* local,
unsigned int sizeToUse = 0);
int allocateSpilledValue (const TargetMachine& target,
const Type* type);
int pushTempValue (const TargetMachine& target,
unsigned int size);
void popAllTempValues (const TargetMachine& target);
void freezeSpillsArea () { spillsAreaFrozen = true; }
void freezeAutomaticVarsArea () { automaticVarsAreaFrozen=true; }
int getOffset (const Value* val) const;
private:
inline void incrementAutomaticVarsSize(int incr) {
automaticVarsSize+= incr;
staticStackSize += incr;
}
inline void incrementRegSpillsSize(int incr) {
regSpillsSize+= incr;
staticStackSize += incr;
}
inline void incrementTmpAreaSize(int incr) {
currentTmpValuesSize += incr;
if (maxTmpValuesSize < currentTmpValuesSize)
{
staticStackSize += currentTmpValuesSize - maxTmpValuesSize;
maxTmpValuesSize = currentTmpValuesSize;
}
}
inline void resetTmpAreaSize() {
currentTmpValuesSize = 0;
}
int allocateOptionalArg (const TargetMachine& target,
const Type* type);
};
#endif
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