codeGeneration
Class CgenSupport

java.lang.Object
  codeGeneration.CgenSupport

public class CgenSupport
extends java.lang.Object

This class aggregates all kinds of support routines and constants for the code generator; all routines are statics, so no instance of this class is even created.

Field Summary

static java.lang.String	A1
static java.lang.String	ACC
static java.lang.String	ADD
static java.lang.String	ADDI
static java.lang.String	ADDIU
static java.lang.String	ADDU
static java.lang.String	ALIGN
static java.lang.String	BEQ
static java.lang.String	BEQZ
static java.lang.String	BGT
static java.lang.String	BLEQ
static java.lang.String	BLT
static java.lang.String	BNE
static int	BOOL_SLOTS
static java.lang.String	BOOLCONST_PREFIX
static java.lang.String	BOOLTAG
static java.lang.String	BRANCH
static java.lang.String	CLASSINIT_SUFFIX
static java.lang.String	CLASSNAMETAB
static java.lang.String	CLASSOBJTAB
static int	DEFAULT_OBJFIELDS
static java.lang.String	DISPTAB_SUFFIX
static int	DISPTABLE_OFFSET
static java.lang.String	DIV
static int	EMPTYSLOT
static java.lang.String	FP
static java.lang.String[]	gcCollectNames Runtime constants for controlling the garbage collector.
static java.lang.String[]	gcInitNames Runtime constants for controlling the garbage collector.
static java.lang.String	GLOBAL
static java.lang.String	HEAP_START
static int	INT_SLOTS
static java.lang.String	INTCONST_PREFIX
static java.lang.String	INTTAG
static java.lang.String	JAL
static java.lang.String	JALR
static java.lang.String	LA
static java.lang.String	LABEL
static java.lang.String	LI
static int	LOG_WORD_SIZE
static java.lang.String	LW
static int	MAXINT
static java.lang.String	METHOD_SEP
static java.lang.String	MOVE
static java.lang.String	MUL
static java.lang.String	NEG
static java.lang.String	OBJECTPROTOBJ
static java.lang.String	PROTOBJ_SUFFIX
static java.lang.String	RA
static java.lang.String	RET
static java.lang.String	SELF
static int	SIZE_OFFSET
static java.lang.String	SLL
static java.lang.String	SP
static java.lang.String	STRCONST_PREFIX
static int	STRING_SLOTS
static java.lang.String	STRINGTAG
static java.lang.String	SUB
static java.lang.String	SW
static java.lang.String	T1
static java.lang.String	T2
static java.lang.String	T3
static int	TAG_OFFSET
static java.lang.String	WORD
static int	WORD_SIZE
static java.lang.String	ZERO

Constructor Summary

CgenSupport()

Method Summary

static void	asciiMode(java.io.PrintWriter s) Switch output mode to ASCII.
static void	byteMode(java.io.PrintWriter s) Switch output mode to BYTE
static void	emitAdd(java.lang.String dest_reg, java.lang.String src1, java.lang.String src2, java.io.PrintWriter s) Emits an ADD instruction.
static void	emitAddiu(java.lang.String dest_reg, java.lang.String src, int imm, java.io.PrintWriter s) Emits an ADDIU instruction.
static void	emitAddu(java.lang.String dest_reg, java.lang.String src1, java.lang.String src2, java.io.PrintWriter s) Emits an ADDU instruction.
static void	emitBeq(java.lang.String src1, java.lang.String src2, int label, java.io.PrintWriter s) Emits a BEQ instruction.
static void	emitBeqz(java.lang.String src, int label, java.io.PrintWriter s) Emits a BEQZ instruction.
static void	emitBgti(java.lang.String src, int imm, int label, java.io.PrintWriter s) Emits a BGTI instruction.
static void	emitBleq(java.lang.String src1, java.lang.String src2, int label, java.io.PrintWriter s) Emits a BLEQ instruction.
static void	emitBlt(java.lang.String src1, java.lang.String src2, int label, java.io.PrintWriter s) Emits a BLT instruction.
static void	emitBlti(java.lang.String src, int imm, int label, java.io.PrintWriter s) Emits a BLTI instruction.
static void	emitBne(java.lang.String src1, java.lang.String src2, int label, java.io.PrintWriter s) Emits a BNE instruction.
static void	emitBranch(int label, java.io.PrintWriter s) Emits a BRANCH instruction.
static void	emitDispTableRef(AbstractSymbol sym, java.io.PrintWriter s) Emits a reference to dispatch table.
static void	emitDiv(java.lang.String dest_reg, java.lang.String src1, java.lang.String src2, java.io.PrintWriter s) Emits a DIV instruction.
static void	emitFetchInt(java.lang.String dest, java.lang.String source, java.io.PrintWriter s) Emits code to fetch the integer value of the Integer object.
static void	emitGCAssign(java.io.PrintWriter s) Emits a call to gc_assign.
static void	emitGCCheck(java.lang.String source, java.io.PrintWriter s) Emits code to check the garbage collector
static void	emitInitRef(AbstractSymbol sym, java.io.PrintWriter s) Emits a reference to class' init() method.
static void	emitJal(java.lang.String dest, java.io.PrintWriter s) Emits a JAL instruction.
static void	emitJalr(java.lang.String dest_reg, java.io.PrintWriter s) Emits a JALR instruction.
static void	emitLabelDef(int label, java.io.PrintWriter s) Emits a definition of a label
static void	emitLabelRef(int label, java.io.PrintWriter s) Emits a reference to a label
static void	emitLoad(java.lang.String dest_reg, int offset, java.lang.String source_reg, java.io.PrintWriter s) Emits an LW instruction.
static void	emitLoadAddress(java.lang.String dest_reg, java.lang.String address, java.io.PrintWriter s) Emits an LA instruction.
static void	emitLoadBool(java.lang.String dest_reg, BoolConst b, java.io.PrintWriter s) Emits an instruction to load a boolean constant into a register.
static void	emitLoadImm(java.lang.String dest_reg, int val, java.io.PrintWriter s) Emits the LI instruction.
static void	emitLoadInt(java.lang.String dest_reg, IntSymbol i, java.io.PrintWriter s) Emits an instruction to load an integer constant into a register.
static void	emitLoadString(java.lang.String dest_reg, StringSymbol str, java.io.PrintWriter s) Emits an instruction to load a string constant into a register.
static void	emitMethodRef(AbstractSymbol classname, AbstractSymbol methodname, java.io.PrintWriter s) Emits a reference to a method in a class
static void	emitMove(java.lang.String dest_reg, java.lang.String source_reg, java.io.PrintWriter s) Emits a MOVE instruction.
static void	emitMul(java.lang.String dest_reg, java.lang.String src1, java.lang.String src2, java.io.PrintWriter s) Emits a MUL instruction.
static void	emitNeg(java.lang.String dest_reg, java.lang.String source_reg, java.io.PrintWriter s) Emits a NEG instruction.
static void	emitPartialLoadAddress(java.lang.String dest_reg, java.io.PrintWriter s) Emits an LA instruction without the address part.
static void	emitProtObjRef(AbstractSymbol sym, java.io.PrintWriter s) Emits a reference to class' prototype object.
static void	emitPush(java.lang.String reg, java.io.PrintWriter s) Emit a sequence of instructions to push a register onto stack.
static void	emitReturn(java.io.PrintWriter s) Emits a RET instruction.
static void	emitSll(java.lang.String dest_reg, java.lang.String src1, int num, java.io.PrintWriter s) Emits an SLL instruction.
static void	emitStore(java.lang.String source_reg, int offset, java.lang.String dest_reg, java.io.PrintWriter s) Emits an SW instruction.
static void	emitStoreInt(java.lang.String source, java.lang.String dest, java.io.PrintWriter s) Emits code to store the integer value of the Integer object.
static void	emitStringConstant(java.lang.String str, java.io.PrintWriter s) Emits a string constant.
static void	emitSub(java.lang.String dest_reg, java.lang.String src1, java.lang.String src2, java.io.PrintWriter s) Emits a SUB instruction.
static void	emitTestCollector(java.io.PrintWriter s) Emits code to manipulate garbage collector

Methods inherited from class java.lang.Object

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

Field Detail

gcInitNames

public static final java.lang.String[] gcInitNames

Runtime constants for controlling the garbage collector.

gcCollectNames

public static final java.lang.String[] gcCollectNames

Runtime constants for controlling the garbage collector.

MAXINT

public static final int MAXINT

See Also:

Constant Field Values

WORD_SIZE

public static final int WORD_SIZE

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Constant Field Values

LOG_WORD_SIZE

public static final int LOG_WORD_SIZE

See Also:

Constant Field Values

CLASSNAMETAB

public static final java.lang.String CLASSNAMETAB

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Constant Field Values

CLASSOBJTAB

public static final java.lang.String CLASSOBJTAB

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Constant Field Values

INTTAG

public static final java.lang.String INTTAG

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Constant Field Values

BOOLTAG

public static final java.lang.String BOOLTAG

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Constant Field Values

STRINGTAG

public static final java.lang.String STRINGTAG

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Constant Field Values

HEAP_START

public static final java.lang.String HEAP_START

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Constant Field Values

DISPTAB_SUFFIX

public static final java.lang.String DISPTAB_SUFFIX

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Constant Field Values

METHOD_SEP

public static final java.lang.String METHOD_SEP

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Constant Field Values

CLASSINIT_SUFFIX

public static final java.lang.String CLASSINIT_SUFFIX

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Constant Field Values

PROTOBJ_SUFFIX

public static final java.lang.String PROTOBJ_SUFFIX

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Constant Field Values

OBJECTPROTOBJ

public static final java.lang.String OBJECTPROTOBJ

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Constant Field Values

INTCONST_PREFIX

public static final java.lang.String INTCONST_PREFIX

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Constant Field Values

STRCONST_PREFIX

public static final java.lang.String STRCONST_PREFIX

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Constant Field Values

BOOLCONST_PREFIX

public static final java.lang.String BOOLCONST_PREFIX

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Constant Field Values

EMPTYSLOT

public static final int EMPTYSLOT

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Constant Field Values

LABEL

public static final java.lang.String LABEL

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Constant Field Values

DEFAULT_OBJFIELDS

public static final int DEFAULT_OBJFIELDS

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Constant Field Values

TAG_OFFSET

public static final int TAG_OFFSET

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Constant Field Values

SIZE_OFFSET

public static final int SIZE_OFFSET

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Constant Field Values

DISPTABLE_OFFSET

public static final int DISPTABLE_OFFSET

See Also:

Constant Field Values

STRING_SLOTS

public static final int STRING_SLOTS

See Also:

Constant Field Values

INT_SLOTS

public static final int INT_SLOTS

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Constant Field Values

BOOL_SLOTS

public static final int BOOL_SLOTS

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Constant Field Values

GLOBAL

public static final java.lang.String GLOBAL

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Constant Field Values

ALIGN

public static final java.lang.String ALIGN

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Constant Field Values

WORD

public static final java.lang.String WORD

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Constant Field Values

ZERO

public static final java.lang.String ZERO

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Constant Field Values

ACC

public static final java.lang.String ACC

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Constant Field Values

A1

public static final java.lang.String A1

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Constant Field Values

SELF

public static final java.lang.String SELF

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Constant Field Values

T1

public static final java.lang.String T1

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Constant Field Values

T2

public static final java.lang.String T2

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Constant Field Values

T3

public static final java.lang.String T3

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Constant Field Values

SP

public static final java.lang.String SP

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Constant Field Values

FP

public static final java.lang.String FP

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Constant Field Values

RA

public static final java.lang.String RA

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Constant Field Values

JALR

public static final java.lang.String JALR

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Constant Field Values

JAL

public static final java.lang.String JAL

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Constant Field Values

RET

public static final java.lang.String RET

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Constant Field Values

SW

public static final java.lang.String SW

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Constant Field Values

LW

public static final java.lang.String LW

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Constant Field Values

LI

public static final java.lang.String LI

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Constant Field Values

LA

public static final java.lang.String LA

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Constant Field Values

MOVE

public static final java.lang.String MOVE

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Constant Field Values

NEG

public static final java.lang.String NEG

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Constant Field Values

ADD

public static final java.lang.String ADD

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Constant Field Values

ADDI

public static final java.lang.String ADDI

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Constant Field Values

ADDU

public static final java.lang.String ADDU

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Constant Field Values

ADDIU

public static final java.lang.String ADDIU

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Constant Field Values

DIV

public static final java.lang.String DIV

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Constant Field Values

MUL

public static final java.lang.String MUL

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Constant Field Values

SUB

public static final java.lang.String SUB

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Constant Field Values

SLL

public static final java.lang.String SLL

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Constant Field Values

BEQZ

public static final java.lang.String BEQZ

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Constant Field Values

BRANCH

public static final java.lang.String BRANCH

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Constant Field Values

BEQ

public static final java.lang.String BEQ

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Constant Field Values

BNE

public static final java.lang.String BNE

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Constant Field Values

BLEQ

public static final java.lang.String BLEQ

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Constant Field Values

BLT

public static final java.lang.String BLT

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Constant Field Values

BGT

public static final java.lang.String BGT

See Also:

Constant Field Values

Constructor Detail

CgenSupport

public CgenSupport()

Method Detail

emitLoad

public static void emitLoad(java.lang.String dest_reg,
                            int offset,
                            java.lang.String source_reg,
                            java.io.PrintWriter s)

Emits an LW instruction.

Parameters:

dest_reg - the destination register

offset - the word offset from source register

source_reg - the source register

s - the output stream

emitStore

public static void emitStore(java.lang.String source_reg,
                             int offset,
                             java.lang.String dest_reg,
                             java.io.PrintWriter s)

Emits an SW instruction.

Parameters:

dest_reg - the destination register

offset - the word offset from source register

source_reg - the source register

s - the output stream

emitLoadImm

public static void emitLoadImm(java.lang.String dest_reg,
                               int val,
                               java.io.PrintWriter s)

Emits the LI instruction.

Parameters:

dest_reg - the destination register

val - the integer value

s - the output stream

emitLoadAddress

public static void emitLoadAddress(java.lang.String dest_reg,
                                   java.lang.String address,
                                   java.io.PrintWriter s)

Emits an LA instruction.

Parameters:

dest_reg - the destination register

address - the address from which a word is loaded

s - the output stream

emitPartialLoadAddress

public static void emitPartialLoadAddress(java.lang.String dest_reg,
                                          java.io.PrintWriter s)

Emits an LA instruction without the address part.

Parameters:

dest_reg - the destination register

s - the output stream

emitLoadBool

public static void emitLoadBool(java.lang.String dest_reg,
                                BoolConst b,
                                java.io.PrintWriter s)

Emits an instruction to load a boolean constant into a register.

Parameters:

dest_reg - the destination register

b - the boolean constant

s - the output stream

emitLoadString

public static void emitLoadString(java.lang.String dest_reg,
                                  StringSymbol str,
                                  java.io.PrintWriter s)

Emits an instruction to load a string constant into a register.

Parameters:

dest_reg - the destination register

str - the string constant

s - the output stream

emitLoadInt

public static void emitLoadInt(java.lang.String dest_reg,
                               IntSymbol i,
                               java.io.PrintWriter s)

Emits an instruction to load an integer constant into a register.

Parameters:

dest_reg - the destination register

i - the integer constant

s - the output stream

emitMove

public static void emitMove(java.lang.String dest_reg,
                            java.lang.String source_reg,
                            java.io.PrintWriter s)

Emits a MOVE instruction.

Parameters:

dest_reg - the destination register

source_reg - the source register

s - the output stream

emitNeg

public static void emitNeg(java.lang.String dest_reg,
                           java.lang.String source_reg,
                           java.io.PrintWriter s)

Emits a NEG instruction.

Parameters:

dest_reg - the destination register

source_reg - the source register

s - the output stream

emitAdd

public static void emitAdd(java.lang.String dest_reg,
                           java.lang.String src1,
                           java.lang.String src2,
                           java.io.PrintWriter s)

Emits an ADD instruction.

Parameters:

dest_reg - the destination register

src1 - the source register 1

src2 - the source register 2

s - the output stream

emitAddu

public static void emitAddu(java.lang.String dest_reg,
                            java.lang.String src1,
                            java.lang.String src2,
                            java.io.PrintWriter s)

Emits an ADDU instruction.

Parameters:

dest_reg - the destination register

src1 - the source register 1

src2 - the source register 2

s - the output stream

emitAddiu

public static void emitAddiu(java.lang.String dest_reg,
                             java.lang.String src,
                             int imm,
                             java.io.PrintWriter s)

Emits an ADDIU instruction.

Parameters:

dest_reg - the destination register

src - the source register

imm - the immediate

s - the output stream

emitDiv

public static void emitDiv(java.lang.String dest_reg,
                           java.lang.String src1,
                           java.lang.String src2,
                           java.io.PrintWriter s)

Emits a DIV instruction.

Parameters:

dest_reg - the destination register

src1 - the source register 1

src2 - the source register 2

s - the output stream

emitMul

public static void emitMul(java.lang.String dest_reg,
                           java.lang.String src1,
                           java.lang.String src2,
                           java.io.PrintWriter s)

Emits a MUL instruction.

Parameters:

dest_reg - the destination register

src1 - the source register 1

src2 - the source register 2

s - the output stream

emitSub

public static void emitSub(java.lang.String dest_reg,
                           java.lang.String src1,
                           java.lang.String src2,
                           java.io.PrintWriter s)

Emits a SUB instruction.

Parameters:

dest_reg - the destination register

src1 - the source register 1

src2 - the source register 2

s - the output stream

emitSll

public static void emitSll(java.lang.String dest_reg,
                           java.lang.String src1,
                           int num,
                           java.io.PrintWriter s)

Emits an SLL instruction.

Parameters:

dest_reg - the destination register

src1 - the source register 1

num - the number of bits to shift

s - the output stream

emitJalr

public static void emitJalr(java.lang.String dest_reg,
                            java.io.PrintWriter s)

Emits a JALR instruction.

Parameters:

dest_reg - the register with target address

s - the output stream

emitJal

public static void emitJal(java.lang.String dest,
                           java.io.PrintWriter s)

Emits a JAL instruction.

Parameters:

dest - the target address or label

s - the output stream

emitReturn

public static void emitReturn(java.io.PrintWriter s)

Emits a RET instruction.

Parameters:

s - the output stream

emitGCAssign

public static void emitGCAssign(java.io.PrintWriter s)

Emits a call to gc_assign.

Parameters:

s - the output stream

emitDispTableRef

public static void emitDispTableRef(AbstractSymbol sym,
                                    java.io.PrintWriter s)

Emits a reference to dispatch table.

Parameters:

sym - the name of the class

s - the output stream

emitInitRef

public static void emitInitRef(AbstractSymbol sym,
                               java.io.PrintWriter s)

Emits a reference to class' init() method.

Parameters:

sym - the name of the class

s - the output stream

emitProtObjRef

public static void emitProtObjRef(AbstractSymbol sym,
                                  java.io.PrintWriter s)

Emits a reference to class' prototype object.

Parameters:

sym - the name of the class

s - the output stream

emitMethodRef

public static void emitMethodRef(AbstractSymbol classname,
                                 AbstractSymbol methodname,
                                 java.io.PrintWriter s)

Emits a reference to a method in a class

Parameters:

classname - the name of the class

methodname - the name of the method

s - the output stream

emitLabelRef

public static void emitLabelRef(int label,
                                java.io.PrintWriter s)

Emits a reference to a label

Parameters:

label - the label number

s - the output stream

emitLabelDef

public static void emitLabelDef(int label,
                                java.io.PrintWriter s)

Emits a definition of a label

Parameters:

label - the label number

s - the output stream

emitBeqz

public static void emitBeqz(java.lang.String src,
                            int label,
                            java.io.PrintWriter s)

Emits a BEQZ instruction.

Parameters:

src - the source register

label - the label number

s - the output stream

emitBeq

public static void emitBeq(java.lang.String src1,
                           java.lang.String src2,
                           int label,
                           java.io.PrintWriter s)

Emits a BEQ instruction.

Parameters:

src1 - the source register 1

src2 - the source register 2

label - the label number

s - the output stream

emitBne

public static void emitBne(java.lang.String src1,
                           java.lang.String src2,
                           int label,
                           java.io.PrintWriter s)

Emits a BNE instruction.

Parameters:

src1 - the source register 1

src2 - the source register 2

label - the label number

s - the output stream

emitBleq

public static void emitBleq(java.lang.String src1,
                            java.lang.String src2,
                            int label,
                            java.io.PrintWriter s)

Emits a BLEQ instruction.

Parameters:

src1 - the source register 1

src2 - the source register 2

label - the label number

s - the output stream

emitBlt

public static void emitBlt(java.lang.String src1,
                           java.lang.String src2,
                           int label,
                           java.io.PrintWriter s)

Emits a BLT instruction.

Parameters:

src1 - the source register 1

src2 - the source register 2

label - the label number

s - the output stream

emitBlti

public static void emitBlti(java.lang.String src,
                            int imm,
                            int label,
                            java.io.PrintWriter s)

Emits a BLTI instruction.

Parameters:

src - the source register

imm - the immediate

label - the label number

s - the output stream

emitBgti

public static void emitBgti(java.lang.String src,
                            int imm,
                            int label,
                            java.io.PrintWriter s)

Emits a BGTI instruction.

Parameters:

src - the source register

imm - the immediate

label - the label number

s - the output stream

emitBranch

public static void emitBranch(int label,
                              java.io.PrintWriter s)

Emits a BRANCH instruction.

Parameters:

label - the label number

s - the output stream

emitPush

public static void emitPush(java.lang.String reg,
                            java.io.PrintWriter s)

Emit a sequence of instructions to push a register onto stack. Stack grows toward smaller addresses.

Parameters:

reg - the register

s - the output stream

emitFetchInt

public static void emitFetchInt(java.lang.String dest,
                                java.lang.String source,
                                java.io.PrintWriter s)

Emits code to fetch the integer value of the Integer object.

Parameters:

source - a pointer to the Integer object

dest - the destination register for the value

s - the output stream

emitStoreInt

public static void emitStoreInt(java.lang.String source,
                                java.lang.String dest,
                                java.io.PrintWriter s)

Emits code to store the integer value of the Integer object.

Parameters:

source - an integer value

dest - the pointer to an Integer object

s - the output stream

emitTestCollector

public static void emitTestCollector(java.io.PrintWriter s)

Emits code to manipulate garbage collector

Parameters:

s - the output stream

emitGCCheck

public static void emitGCCheck(java.lang.String source,
                               java.io.PrintWriter s)

Emits code to check the garbage collector

Parameters:

s - the output stream

asciiMode

public static void asciiMode(java.io.PrintWriter s)

Switch output mode to ASCII.

Parameters:

s - the output stream

byteMode

public static void byteMode(java.io.PrintWriter s)

Switch output mode to BYTE

Parameters:

s - the output stream

emitStringConstant

public static void emitStringConstant(java.lang.String str,
                                      java.io.PrintWriter s)

Emits a string constant.

Parameters:

str - the string constant

s - the output stream