scale.backend.alpha
Class AlphaAssembler

java.lang.Object
  scale.backend.Assembler
      scale.backend.alpha.AlphaAssembler

public final class AlphaAssembler
extends Assembler

This class generates Alpha assembly language from a list of Alpha instructions.

$Id: AlphaAssembler.java,v 1.39 2007-10-04 19:57:50 burrill Exp $

Copyright 2007 by the Scale Compiler Group,
Department of Computer Science
University of Massachusetts,
Amherst MA. 01003, USA
All Rights Reserved.

Field Summary

Fields inherited from class scale.backend.Assembler

gen, hex, oneItemPerLine, repsAllowedInAL, source

Constructor Summary

AlphaAssembler(Generator gen, java.lang.String source, boolean instructionScheduling)

Method Summary

void	assembleComment(java.lang.String comment, Emit emit) Insert the assembler representation of the comment into the output stream.
long	assembleData(Emit emit, SpaceAllocation sa, long location) Called for each allocation in a named area.
void	assembleDataAreaHeader(Emit emit, int kind) Generate assembler directives for the start of a data area.
void	assembleEpilog(Emit emit) Called at the very end of generating assembly code.
void	assembleLabel(Label label, Emit emit) Generate a label in the assembly output.
void	assembleProlog(Emit emit) Called at the very beginning of generating assembly code.
java.lang.String	assembleRegister(int reg) Convert a register number into its assembly language form.
protected void	genAsciiText(Emit emit, java.lang.String str) Generate the assembly directive required to generate an ASCII text string.
protected void	genBytes(Emit emit, int numBytes, long data, int reps) Output an integer data item as a string of bytes.
protected long	genData(Emit emit, int dt, Label lab, int reps, boolean aligned) Generate the data representation for address of the label.
protected void	genDirective(Emit emit, int dt) Generate the assembly directive required for the type.
protected void	genZeroFill(Emit emit, long size) Generate the assembly directive required to generate a zero-filled area.
protected int	getDirectiveSize(int dt) Return the number of addressable units required for one value of the specified type.
java.lang.String	getLabelString(Label label) Return the String representing the label.
java.lang.String	relocationInfo(Displacement disp, int relocType) Return relocation type in assembler format.

Methods inherited from class scale.backend.Assembler

assemble, assembleDataBegin, assembleDataEnd, assembleInstructions, genData, genData, genData, genData, genData, genData, genData, genData, genData, genData, getDisplayString, getName, getSourceLanguage, getSpaceAllocation, isFortran

Methods inherited from class java.lang.Object

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

Constructor Detail

AlphaAssembler

public AlphaAssembler(Generator gen,
                      java.lang.String source,
                      boolean instructionScheduling)

Parameters:

gen - is the instruction generator used to generate the instructions.

source - specifies the source program

Method Detail

assembleProlog

public void assembleProlog(Emit emit)

Called at the very beginning of generating assembly code. Generate assembler directives needed at the beginning of the assembly language file.

Specified by:

assembleProlog in class Assembler

assembleEpilog

public void assembleEpilog(Emit emit)

Called at the very end of generating assembly code. Generate assembler directives needed at the end of the assembly language file.

Specified by:

assembleEpilog in class Assembler

getLabelString

public java.lang.String getLabelString(Label label)

Return the String representing the label.

Specified by:

getLabelString in class Assembler

assembleLabel

public void assembleLabel(Label label,
                          Emit emit)

Generate a label in the assembly output.

Specified by:

assembleLabel in class Assembler

assembleComment

public void assembleComment(java.lang.String comment,
                            Emit emit)

Insert the assembler representation of the comment into the output stream.

Specified by:

assembleComment in class Assembler

assembleRegister

public java.lang.String assembleRegister(int reg)

Convert a register number into its assembly language form.

Specified by:

assembleRegister in class Assembler

relocationInfo

public java.lang.String relocationInfo(Displacement disp,
                                       int relocType)

Return relocation type in assembler format.

assembleDataAreaHeader

public void assembleDataAreaHeader(Emit emit,
                                   int kind)

Generate assembler directives for the start of a data area.

Specified by:

assembleDataAreaHeader in class Assembler

Parameters:

kind - specifies the area kind

emit - is the output sink

genDirective

protected void genDirective(Emit emit,
                            int dt)

Generate the assembly directive required for the type.

Specified by:

genDirective in class Assembler

Parameters:

dt - - the data type

emit - specifies where to put the directive.

See Also:

SpaceAllocation

getDirectiveSize

protected int getDirectiveSize(int dt)

Return the number of addressable units required for one value of the specified type.

Specified by:

getDirectiveSize in class Assembler

Parameters:

dt - - the data type

See Also:

SpaceAllocation

genZeroFill

protected void genZeroFill(Emit emit,
                           long size)

Generate the assembly directive required to generate a zero-filled area.

Overrides:

genZeroFill in class Assembler

Parameters:

emit - specifies where to put the directive.

size - is the number of bytes of zeros required

See Also:

SpaceAllocation

genAsciiText

protected void genAsciiText(Emit emit,
                            java.lang.String str)

Generate the assembly directive required to generate an ASCII text string.

Overrides:

genAsciiText in class Assembler

Parameters:

emit - specifies where to put the directive.

str - is the string

genBytes

protected void genBytes(Emit emit,
                        int numBytes,
                        long data,
                        int reps)

Description copied from class: Assembler

Output an integer data item as a string of bytes. This method is used when the data is not on the correct boundary for a normal assembly language directive.

Overrides:

genBytes in class Assembler

Parameters:

emit - specifies where to generate the data

numBytes - is the number of bytes of data

data - is the data to be output

reps - is the number of times to repeat the data

genData

protected long genData(Emit emit,
                       int dt,
                       Label lab,
                       int reps,
                       boolean aligned)

Generate the data representation for address of the label.

Specified by:

genData in class Assembler

Parameters:

emit - specifies where to generate the data

dt - specifies the data type

lab - is the label

reps - specifies how many times to generate the representation

aligned - specifies whether the data will be aligned

Returns:

the number of bytes generated

See Also:

SpaceAllocation

assembleData

public long assembleData(Emit emit,
                         SpaceAllocation sa,
                         long location)

Description copied from class: Assembler

Called for each allocation in a named area.

Specified by:

assembleData in class Assembler

Parameters:

emit - is the output sink

sa - is the data space

location - is the current location