Class CgenSupport

java.lang.Object
  CgenSupport

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

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

Constructor Summary

(package private)

CgenSupport()

Method Summary

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

static final java.lang.String[] gcInitNames

Runtime constants for controlling the garbage collector.

gcCollectNames

static final java.lang.String[] gcCollectNames

Runtime constants for controlling the garbage collector.

MAXINT

static final int MAXINT

See Also:

Constant Field Values

WORD_SIZE

static final int WORD_SIZE

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Constant Field Values

LOG_WORD_SIZE

static final int LOG_WORD_SIZE

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Constant Field Values

CLASSNAMETAB

static final java.lang.String CLASSNAMETAB

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Constant Field Values

CLASSOBJTAB

static final java.lang.String CLASSOBJTAB

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Constant Field Values

INTTAG

static final java.lang.String INTTAG

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Constant Field Values

BOOLTAG

static final java.lang.String BOOLTAG

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Constant Field Values

STRINGTAG

static final java.lang.String STRINGTAG

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Constant Field Values

HEAP_START

static final java.lang.String HEAP_START

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Constant Field Values

DISPTAB_SUFFIX

static final java.lang.String DISPTAB_SUFFIX

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Constant Field Values

METHOD_SEP

static final java.lang.String METHOD_SEP

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Constant Field Values

CLASSINIT_SUFFIX

static final java.lang.String CLASSINIT_SUFFIX

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Constant Field Values

PROTOBJ_SUFFIX

static final java.lang.String PROTOBJ_SUFFIX

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Constant Field Values

OBJECTPROTOBJ

static final java.lang.String OBJECTPROTOBJ

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Constant Field Values

INTCONST_PREFIX

static final java.lang.String INTCONST_PREFIX

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Constant Field Values

STRCONST_PREFIX

static final java.lang.String STRCONST_PREFIX

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Constant Field Values

BOOLCONST_PREFIX

static final java.lang.String BOOLCONST_PREFIX

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Constant Field Values

EMPTYSLOT

static final int EMPTYSLOT

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Constant Field Values

LABEL

static final java.lang.String LABEL

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Constant Field Values

DEFAULT_OBJFIELDS

static final int DEFAULT_OBJFIELDS

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Constant Field Values

TAG_OFFSET

static final int TAG_OFFSET

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Constant Field Values

SIZE_OFFSET

static final int SIZE_OFFSET

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Constant Field Values

DISPTABLE_OFFSET

static final int DISPTABLE_OFFSET

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Constant Field Values

STRING_SLOTS

static final int STRING_SLOTS

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Constant Field Values

INT_SLOTS

static final int INT_SLOTS

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Constant Field Values

BOOL_SLOTS

static final int BOOL_SLOTS

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Constant Field Values

GLOBAL

static final java.lang.String GLOBAL

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Constant Field Values

ALIGN

static final java.lang.String ALIGN

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Constant Field Values

WORD

static final java.lang.String WORD

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Constant Field Values

ZERO

static final java.lang.String ZERO

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Constant Field Values

ACC

static final java.lang.String ACC

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Constant Field Values

A1

static final java.lang.String A1

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Constant Field Values

SELF

static final java.lang.String SELF

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Constant Field Values

T1

static final java.lang.String T1

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Constant Field Values

T2

static final java.lang.String T2

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Constant Field Values

T3

static final java.lang.String T3

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Constant Field Values

SP

static final java.lang.String SP

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Constant Field Values

FP

static final java.lang.String FP

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Constant Field Values

RA

static final java.lang.String RA

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Constant Field Values

JALR

static final java.lang.String JALR

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Constant Field Values

JAL

static final java.lang.String JAL

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Constant Field Values

RET

static final java.lang.String RET

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Constant Field Values

SW

static final java.lang.String SW

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Constant Field Values

LW

static final java.lang.String LW

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Constant Field Values

LI

static final java.lang.String LI

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Constant Field Values

LA

static final java.lang.String LA

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Constant Field Values

MOVE

static final java.lang.String MOVE

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Constant Field Values

NEG

static final java.lang.String NEG

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Constant Field Values

ADD

static final java.lang.String ADD

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Constant Field Values

ADDI

static final java.lang.String ADDI

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Constant Field Values

ADDU

static final java.lang.String ADDU

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Constant Field Values

ADDIU

static final java.lang.String ADDIU

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Constant Field Values

DIV

static final java.lang.String DIV

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Constant Field Values

MUL

static final java.lang.String MUL

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Constant Field Values

SUB

static final java.lang.String SUB

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Constant Field Values

SLL

static final java.lang.String SLL

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Constant Field Values

BEQZ

static final java.lang.String BEQZ

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Constant Field Values

BRANCH

static final java.lang.String BRANCH

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Constant Field Values

BEQ

static final java.lang.String BEQ

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Constant Field Values

BNE

static final java.lang.String BNE

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Constant Field Values

BLEQ

static final java.lang.String BLEQ

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Constant Field Values

BLT

static final java.lang.String BLT

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Constant Field Values

BGT

static final java.lang.String BGT

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Constant Field Values

ascii

private static boolean ascii

Constructor Detail

CgenSupport

CgenSupport()

Method Detail

emitLoad

static void emitLoad(java.lang.String dest_reg,
                     int offset,
                     java.lang.String source_reg,
                     java.io.PrintStream 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

static void emitStore(java.lang.String source_reg,
                      int offset,
                      java.lang.String dest_reg,
                      java.io.PrintStream 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

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

Emits the LI instruction.

Parameters:

dest_reg - the destination register

val - the integer value

s - the output stream

emitLoadAddress

static void emitLoadAddress(java.lang.String dest_reg,
                            java.lang.String address,
                            java.io.PrintStream 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

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

Emits an LA instruction without the address part.

Parameters:

dest_reg - the destination register

s - the output stream

emitLoadBool

static void emitLoadBool(java.lang.String dest_reg,
                         BoolConst b,
                         java.io.PrintStream 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

static void emitLoadString(java.lang.String dest_reg,
                           StringSymbol str,
                           java.io.PrintStream 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

static void emitLoadInt(java.lang.String dest_reg,
                        IntSymbol i,
                        java.io.PrintStream 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

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

Emits a MOVE instruction.

Parameters:

dest_reg - the destination register

source_reg - the source register

s - the output stream

emitNeg

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

Emits a NEG instruction.

Parameters:

dest_reg - the destination register

source_reg - the source register

s - the output stream

emitAdd

static void emitAdd(java.lang.String dest_reg,
                    java.lang.String src1,
                    java.lang.String src2,
                    java.io.PrintStream 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

static void emitAddu(java.lang.String dest_reg,
                     java.lang.String src1,
                     java.lang.String src2,
                     java.io.PrintStream 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

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

Emits an ADDIU instruction.

Parameters:

dest_reg - the destination register

src - the source register

imm - the immediate

s - the output stream

emitDiv

static void emitDiv(java.lang.String dest_reg,
                    java.lang.String src1,
                    java.lang.String src2,
                    java.io.PrintStream 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

static void emitMul(java.lang.String dest_reg,
                    java.lang.String src1,
                    java.lang.String src2,
                    java.io.PrintStream 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

static void emitSub(java.lang.String dest_reg,
                    java.lang.String src1,
                    java.lang.String src2,
                    java.io.PrintStream 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

static void emitSll(java.lang.String dest_reg,
                    java.lang.String src1,
                    int num,
                    java.io.PrintStream 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

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

Emits a JALR instruction.

Parameters:

dest_reg - the register with target address

s - the output stream

emitJal

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

Emits a JAL instruction.

Parameters:

dest - the target address or label

s - the output stream

emitReturn

static void emitReturn(java.io.PrintStream s)

Emits a RET instruction.

Parameters:

s - the output stream

emitGCAssign

static void emitGCAssign(java.io.PrintStream s)

Emits a call to gc_assign.

Parameters:

s - the output stream

emitDispTableRef

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

Emits a reference to dispatch table.

Parameters:

sym - the name of the class

s - the output stream

emitInitRef

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

Emits a reference to class' init() method.

Parameters:

sym - the name of the class

s - the output stream

emitProtObjRef

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

Emits a reference to class' prototype object.

Parameters:

sym - the name of the class

s - the output stream

emitMethodRef

static void emitMethodRef(AbstractSymbol classname,
                          AbstractSymbol methodname,
                          java.io.PrintStream 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

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

Emits a reference to a label

Parameters:

label - the label number

s - the output stream

emitLabelDef

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

Emits a definition of a label

Parameters:

label - the label number

s - the output stream

emitBeqz

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

Emits a BEQZ instruction.

Parameters:

src - the source register

label - the label number

s - the output stream

emitBeq

static void emitBeq(java.lang.String src1,
                    java.lang.String src2,
                    int label,
                    java.io.PrintStream 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

static void emitBne(java.lang.String src1,
                    java.lang.String src2,
                    int label,
                    java.io.PrintStream 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

static void emitBleq(java.lang.String src1,
                     java.lang.String src2,
                     int label,
                     java.io.PrintStream 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

static void emitBlt(java.lang.String src1,
                    java.lang.String src2,
                    int label,
                    java.io.PrintStream 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

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

Emits a BLTI instruction.

Parameters:

src - the source register

imm - the immediate

label - the label number

s - the output stream

emitBgti

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

Emits a BGTI instruction.

Parameters:

src - the source register

imm - the immediate

label - the label number

s - the output stream

emitBranch

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

Emits a BRANCH instruction.

Parameters:

label - the label number

s - the output stream

emitPush

static void emitPush(java.lang.String reg,
                     java.io.PrintStream 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

static void emitFetchInt(java.lang.String dest,
                         java.lang.String source,
                         java.io.PrintStream 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

static void emitStoreInt(java.lang.String source,
                         java.lang.String dest,
                         java.io.PrintStream 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

static void emitTestCollector(java.io.PrintStream s)

Emits code to manipulate garbage collector

Parameters:

s - the output stream

emitGCCheck

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

Emits code to check the garbage collector

Parameters:

s - the output stream

asciiMode

static void asciiMode(java.io.PrintStream s)

Switch output mode to ASCII.

Parameters:

s - the output stream

byteMode

static void byteMode(java.io.PrintStream s)

Switch output mode to BYTE

Parameters:

s - the output stream

emitStringConstant

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

Emits a string constant.

Parameters:

str - the string constant

s - the output stream