harpoon.Backend.Generic
Class CodeGen

java.lang.Object
  harpoon.Backend.Generic.CodeGen

Direct Known Subclasses:

MaxMunchCG

public abstract class CodeGen
extends Object

Generic.CodeGen is a general class for specific Backends to extend. Typically a Specfile for a specific backend will be designed as an extension of this class.

Version:

$Id: CodeGen.java,v 1.4 2002/04/10 03:02:43 cananian Exp $

Author:

Felix S. Klock II <pnkfelix@mit.edu>

Field Summary

Frame	frame
protected InstrFactory	instrFactory InstrFactory for Instrs currently generated by CodeGen#emit.

Constructor Summary

CodeGen(Frame frame)
Creates a Generic.CodeGen.

Method Summary

protected abstract Instr	cgg_backendEmit(Instr i) Protected helper method guaranteed to be called by emit(Instr).
abstract List	cgg_genCode(Code tree, InstrFactory inf) Creates a Instr list from the IR.Tree.Code tree.
abstract Instr	cgg_genData(Data tree, InstrFactory inf)
void	debug(String s)
protected abstract void	declare(Temp t, Derivation.DList dl)
protected abstract void	declare(Temp t, HClass clz)
protected void	declare(Temp t, TreeDerivation td, Exp e)
protected Instr	emit(Instr i) Emits i as the next instruction in the instruction stream.
protected void	endGroup(InstrGroup g)
List	genCode(Code tree, InstrFactory inf) Creates a Instr list from the IR.Tree.Code tree.
Instr	genData(Data tree, InstrFactory inf) Creates a Instr list from the IR.Tree.Data tree.
String	prettyPrint(Tree exp)
void	procFixup(HMethod hm, Code code, int stackspace, Set usedRegisters) Fixes up the procedure entry and exit code for a list of instrs, once it is known how many registers and how much stack space is used.
abstract Instr	procFixup(HMethod hm, Instr instr, int stackspace, Set usedRegisters) Fixes up the procedure entry and exit code for a list of instrs, once it is known how many registers and how much stack space is used.
protected InstrGroup	startGroup(InstrGroup.Type type)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

frame

public final Frame frame

instrFactory

protected InstrFactory instrFactory

InstrFactory for Instrs currently generated by CodeGen#emit. (Assigned by CodeGen#genCode and CodeGen#genData).

Constructor Detail

CodeGen

public CodeGen(Frame frame)

Creates a Generic.CodeGen.

Method Detail

startGroup

protected InstrGroup startGroup(InstrGroup.Type type)

endGroup

protected void endGroup(InstrGroup g)

emit

protected final Instr emit(Instr i)

Emits i as the next instruction in the instruction stream.

cgg_backendEmit

protected abstract Instr cgg_backendEmit(Instr i)

Protected helper method guaranteed to be called by emit(Instr). Must be overridden by CGG specific extension. (IE, there is a CodeGen extension where cgg_backendEmit(..) is implemented for every CodeGeneratorGenerator, such as MaxMunchCG).

declare

protected abstract void declare(Temp t,
                                HClass clz)

declare

protected abstract void declare(Temp t,
                                Derivation.DList dl)

declare

protected final void declare(Temp t,
                             TreeDerivation td,
                             Exp e)

procFixup

public abstract Instr procFixup(HMethod hm,
                                Instr instr,
                                int stackspace,
                                Set usedRegisters)

Fixes up the procedure entry and exit code for a list of instrs, once it is known how many registers and how much stack space is used.

procFixup

public void procFixup(HMethod hm,
                      Code code,
                      int stackspace,
                      Set usedRegisters)

Fixes up the procedure entry and exit code for a list of instrs, once it is known how many registers and how much stack space is used.

genCode

public final List genCode(Code tree,
                          InstrFactory inf)

Creates a Instr list from the IR.Tree.Code tree.
effects: Generates and returns a two element list, where the first element is the head of a Instrs to execute tree, and the second element is the Derivation for that list of instructions.

Returns:

The head of a list of Instrs

cgg_genCode

public abstract List cgg_genCode(Code tree,
                                 InstrFactory inf)

Creates a Instr list from the IR.Tree.Code tree.
effects: Generates and returns a two element list, where the first element is the head of a Instrs to execute tree, and the second element is the Derivation for that list of instructions.

Returns:

The head of a list of Instrs

genData

public final Instr genData(Data tree,
                           InstrFactory inf)

Creates a Instr list from the IR.Tree.Data tree.
effects: Generates and returns a list of Instrs representing the layout of tree.

Returns:

The head of a list of Instrs

cgg_genData

public abstract Instr cgg_genData(Data tree,
                                  InstrFactory inf)

debug

public void debug(String s)

prettyPrint

public String prettyPrint(Tree exp)