comp
Class Assembler

java.lang.Object
  |
  +--comp.Assembler

public class Assembler

extends java.lang.Object

An object that knows how to spit out (MIPS) assembly code. Should really be an interface, with a MIPS implementation, but that's taking things a little far right now.

Version:

$Id: Assembler.java,v 1.6 2002/05/10 22:49:25 dugan Exp $

Field Summary

static int	ADD Binary operators.
static int	AND
static int	DIV
static int	EQ
static int	GT
static int	GTE
static int	LT
static int	LTE
static int	MOD
static int	MULT
static int	NEQ
static int	OR
(package private) static java.io.PrintStream	out
static int	SLL
static int	SRA
static int	SRL
static int	SUB
static int	XOR

Constructor Summary

Assembler()

Method Summary

void	addImm(java.lang.String dest, java.lang.String reg, int imm) Add the immediate operand to reg, and place the result in dest.
void	binop(int op, java.lang.String dest, java.lang.String left, java.lang.String right) Emit a binary operation on the three given registers.
void	branchEq(java.lang.String r1, java.lang.String r2, java.lang.String label) Branch to the given label if regs[r1] == regs[r2]
void	branchNe(java.lang.String r1, java.lang.String r2, java.lang.String label) Branch to the given label if regs[r1] != regs[r2]
void	call(java.lang.String label) Call the procedure.
void	comment(java.lang.String msg) Issue a comment without newline.
void	commentln(java.lang.String msg) Issue a comment on a line by itself.
void	dumpStrings(java.util.Map strings) Dump a Map of static strings to the text region.
void	growStack(int bytes) Grow the stack by the given number of bytes.
void	jump(java.lang.String label) Unconditionally jump to the given label.
void	jumpReg(java.lang.String reg) Jump to the address in the register.
void	label(java.lang.String label) Issue a label, without a trailing newline.
void	labelln(java.lang.String label) Issue a label on its own line.
void	loadAddress(java.lang.String dest, java.lang.String label) Load an address.
void	loadByte(java.lang.String dest, int offset, java.lang.String base) Load a byte from the integer offset of base register into the dest.
void	loadByte(java.lang.String dest, java.lang.String label, java.lang.String base) Load a byte from the labeled offset of base register.
void	loadImm(java.lang.String dest, int imm) Handles constants larger than |2^15| now
void	loadWord(java.lang.String dest, int offset, java.lang.String base) Load a word from offset of base register into the dest register.
void	loadWord(java.lang.String dest, java.lang.String label, java.lang.String base) Load a word from the labeled offset of base register into the dest.
void	move(java.lang.String dest, java.lang.String src) Move the value in the src register into the dest register.
void	nop() Do nothing.
void	shrinkStack(int bytes) Shrink the stack by the given number of bytes.
void	space(java.lang.String label, int size) Ask for size bytes of space.
void	startData() Start the dtaa section.
void	startText() Start the text section.
void	storeByte(java.lang.String src, int offset, java.lang.String base) Store a byte to the integer offset of base register.
void	storeByte(java.lang.String src, java.lang.String label, java.lang.String base) Store a byte to the labeled offset of base register
void	storeWord(java.lang.String src, int offset, java.lang.String base) Store a word from offset of base register into the dest register.
void	storeWord(java.lang.String src, java.lang.String label, java.lang.String base) Store a word into the labeled offset of base register
void	word(java.lang.String label, int value) Ask for a word size of space with the intial value.

Methods inherited from class java.lang.Object

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

Field Detail

out

static java.io.PrintStream out

ADD

public static final int ADD

Binary operators.

See Also:

Constant Field Values

SUB

public static final int SUB

See Also:

Constant Field Values

MOD

public static final int MOD

See Also:

Constant Field Values

MULT

public static final int MULT

See Also:

Constant Field Values

DIV

public static final int DIV

See Also:

Constant Field Values

EQ

public static final int EQ

See Also:

Constant Field Values

NEQ

public static final int NEQ

See Also:

Constant Field Values

LT

public static final int LT

See Also:

Constant Field Values

GT

public static final int GT

See Also:

Constant Field Values

LTE

public static final int LTE

See Also:

Constant Field Values

GTE

public static final int GTE

See Also:

Constant Field Values

SLL

public static final int SLL

See Also:

Constant Field Values

SRL

public static final int SRL

See Also:

Constant Field Values

SRA

public static final int SRA

See Also:

Constant Field Values

AND

public static final int AND

See Also:

Constant Field Values

OR

public static final int OR

See Also:

Constant Field Values

XOR

public static final int XOR

See Also:

Constant Field Values

Constructor Detail

Assembler

public Assembler()

Method Detail

commentln

public void commentln(java.lang.String msg)

Issue a comment on a line by itself.

comment

public void comment(java.lang.String msg)

Issue a comment without newline.

label

public void label(java.lang.String label)

Issue a label, without a trailing newline.

labelln

public void labelln(java.lang.String label)

Issue a label on its own line.

dumpStrings

public void dumpStrings(java.util.Map strings)

Dump a Map of static strings to the text region. The map should map labels -> strings.

space

public void space(java.lang.String label,
                  int size)

Ask for size bytes of space.

word

public void word(java.lang.String label,
                 int value)

Ask for a word size of space with the intial value.

startData

public void startData()

Start the dtaa section.

startText

public void startText()

Start the text section.

binop

public void binop(int op,
                  java.lang.String dest,
                  java.lang.String left,
                  java.lang.String right)

Emit a binary operation on the three given registers.

addImm

public void addImm(java.lang.String dest,
                   java.lang.String reg,
                   int imm)

Add the immediate operand to reg, and place the result in dest.

loadWord

public void loadWord(java.lang.String dest,
                     int offset,
                     java.lang.String base)

Load a word from offset of base register into the dest register.

loadWord

public void loadWord(java.lang.String dest,
                     java.lang.String label,
                     java.lang.String base)

Load a word from the labeled offset of base register into the dest.

storeWord

public void storeWord(java.lang.String src,
                      int offset,
                      java.lang.String base)

Store a word from offset of base register into the dest register.

storeWord

public void storeWord(java.lang.String src,
                      java.lang.String label,
                      java.lang.String base)

Store a word into the labeled offset of base register

loadByte

public void loadByte(java.lang.String dest,
                     int offset,
                     java.lang.String base)

Load a byte from the integer offset of base register into the dest.

loadByte

public void loadByte(java.lang.String dest,
                     java.lang.String label,
                     java.lang.String base)

Load a byte from the labeled offset of base register.

storeByte

public void storeByte(java.lang.String src,
                      int offset,
                      java.lang.String base)

Store a byte to the integer offset of base register.

storeByte

public void storeByte(java.lang.String src,
                      java.lang.String label,
                      java.lang.String base)

Store a byte to the labeled offset of base register

loadImm

public void loadImm(java.lang.String dest,
                    int imm)

Handles constants larger than |2^15| now

loadAddress

public void loadAddress(java.lang.String dest,
                        java.lang.String label)

Load an address. This is a weird pseudo-op at this level. The label should be label defined in the data segment.

growStack

public void growStack(int bytes)

Grow the stack by the given number of bytes.

shrinkStack

public void shrinkStack(int bytes)

Shrink the stack by the given number of bytes.

move

public void move(java.lang.String dest,
                 java.lang.String src)

Move the value in the src register into the dest register.

branchEq

public void branchEq(java.lang.String r1,
                     java.lang.String r2,
                     java.lang.String label)

Branch to the given label if regs[r1] == regs[r2]

branchNe

public void branchNe(java.lang.String r1,
                     java.lang.String r2,
                     java.lang.String label)

Branch to the given label if regs[r1] != regs[r2]

jump

public void jump(java.lang.String label)

Unconditionally jump to the given label.

jumpReg

public void jumpReg(java.lang.String reg)

Jump to the address in the register.

call

public void call(java.lang.String label)

Call the procedure. Save the return address.

nop

public void nop()

Do nothing.