codegenx86
Class X86Support

java.lang.Object
  codegenx86.X86Support

public class X86Support
extends java.lang.Object

x86 assembly support create an object from this class for use in generating x86 code

Field Summary

int	SYSCALL_BRK brk syscall
int	SYSCALL_EXIT Exit syscall
int	SYSCALL_FILE_CLOSE File close syscall
int	SYSCALL_FILE_OPEN File open syscall
int	SYSCALL_FILE_READ File read syscall
int	SYSCALL_FILE_WRITE File write syscall
int	SYSCALL_GET_TIME Get time syscall

Constructor Summary

X86Support(java.io.PrintStream out)
X86Support constructor

Method Summary

void	genAdd(java.lang.String srcReg, java.lang.String destReg) Generate an add instruction
void	genAlign() Generate word alignment directive
void	genAnd(java.lang.String srcReg, java.lang.String destReg) Generate an and instruction
void	genAscii(java.lang.String ascii) Generate an ASCII string (terminates with zero byte and aligns)
void	genByte(java.lang.String dataByte) Generate a data byte
void	genComment(java.lang.String text) Generate a comment
void	genCondBeq(java.lang.String reg1, java.lang.String reg2, java.lang.String label) Generate a conditional branch branches if first operand is equal to second operand
void	genCondBgeq(java.lang.String reg1, java.lang.String reg2, java.lang.String label) Generate a conditional branch branches if first operand is greater than or equal to second operand
void	genCondBgt(java.lang.String reg1, java.lang.String reg2, java.lang.String label) Generate a conditional branch branches if first operand is greater than second operand
void	genCondBleq(java.lang.String reg1, java.lang.String reg2, java.lang.String label) Generate a conditional branch branches if first operand is less than second operand
void	genCondBlt(java.lang.String reg1, java.lang.String reg2, java.lang.String label) Generate a conditional branch branches if first operand is less than or equal to second operand
void	genCondBne(java.lang.String reg1, java.lang.String reg2, java.lang.String label) Generate a conditional branch branches if first operand is not equal to second operand
void	genDataStart() Generate the code to start the data section
void	genDirCall(java.lang.String label) Generate a direct call
void	genDiv(java.lang.String srcReg) Generate a divide instruction (note: puts quotient in %eax and remainder in %edx)
void	genGlobal(java.lang.String label) Generate a global
void	genInDirCall(java.lang.String reg) Generate an indirect call
void	genLabel(java.lang.String label) Generate a reference label
void	genLoadByte() Generate a load byte instruction Note: uses the address in %esi (this register), increments %esi, and automatically puts result in the accumulator (%eax)
void	genMod(java.lang.String srcReg) Generate a modulus instruction (note: puts quotient in %eax and remainder in %edx)
void	genMove(int imm, java.lang.String destReg) Generate a move instruction - loads an immediate into a register
void	genMove(int offset, java.lang.String baseReg, java.lang.String destReg) Generate a move instruction - loads a register value to memory
void	genMove(java.lang.String srcReg, int offset, java.lang.String baseReg) Generate a move instruction - stores a register value to memory
void	genMove(java.lang.String src, java.lang.String destReg) Generate a move instruction - a register-to-register move or a load address depending on whether the source parameter is a register or a label
void	genMul(java.lang.String srcReg) Generate a multiply instruction (note: puts result in %eax, also overwrites %edx with 0)
void	genNeg(java.lang.String reg) Generate a negation instruction
void	genNot(java.lang.String reg) Generate a not instruction
void	genOr(java.lang.String srcReg, java.lang.String destReg) Generate an or instruction
void	genPop(java.lang.String reg) Generate a pop instruction
void	genPush(java.lang.String reg) Generate a push instruction
void	genRetn() Generate a return
void	genShiftLeft(java.lang.String destReg) Generate a shift left instruction (note: shift amount is taken from %ecx)
void	genShiftRight(java.lang.String destReg) Generate a shift right instruction (note: shift amount is taken from %ecx)
void	genSpace(int n) Generate a data segment of size n
void	genStoreByte() Generate a store word instruction Note: uses the address in %edi, increments %edi, and takes the value from the accumulator (%eax)
void	genSub(java.lang.String srcReg, java.lang.String destReg) Generate a subtraction instruction
void	genSyscall(int syscallId) Generate a system call
void	genTextStart() Generate the code to start the data section
void	genUncondBr(java.lang.String label) Generate an unconditional branch
void	genWord(java.lang.String dataWord) Generate a data word
void	genXor(java.lang.String srcReg, java.lang.String destReg) Generate an xor instruction
java.lang.String	getAccReg() Get the accumulator register (note: this is eax)
java.lang.String	getEAXReg() Get the eax register (note: this is the accumulator)
java.lang.String	getEBXReg() Get the ebx register
java.lang.String	getECXReg() Get the ecx register
java.lang.String	getEDIReg() Get the edi register
java.lang.String	getEDXReg() Get the edx register
java.lang.String	getESIReg() Get the esi register (note: this is 'this' register)
java.lang.String	getFPReg() Get the frame pointer register
java.lang.String	getLabel() Get a unique label for use with control flow
int	getNextAvailStackOffset() Get next available stack offset
java.lang.String	getSPReg() Get the stack pointer register
java.lang.String	getThisReg() Get the register that holds 'this' pointer (note: this is esi)
int	getWordSize() Get the word size
void	setNextAvailStackOffset(int offset) Set next available stack offset

Methods inherited from class java.lang.Object

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

Field Detail

SYSCALL_EXIT

public final int SYSCALL_EXIT

Exit syscall

See Also:

Constant Field Values

SYSCALL_FILE_OPEN

public final int SYSCALL_FILE_OPEN

File open syscall

See Also:

Constant Field Values

SYSCALL_FILE_CLOSE

public final int SYSCALL_FILE_CLOSE

File close syscall

See Also:

Constant Field Values

SYSCALL_FILE_READ

public final int SYSCALL_FILE_READ

File read syscall

See Also:

Constant Field Values

SYSCALL_FILE_WRITE

public final int SYSCALL_FILE_WRITE

File write syscall

See Also:

Constant Field Values

SYSCALL_GET_TIME

public final int SYSCALL_GET_TIME

Get time syscall

See Also:

Constant Field Values

SYSCALL_BRK

public final int SYSCALL_BRK

brk syscall

See Also:

Constant Field Values

Constructor Detail

X86Support

public X86Support(java.io.PrintStream out)

X86Support constructor

Parameters:

out - print stream

Method Detail

getNextAvailStackOffset

public int getNextAvailStackOffset()

Get next available stack offset

Returns:

next available stack offset

setNextAvailStackOffset

public void setNextAvailStackOffset(int offset)

Set next available stack offset

Parameters:

offset - new available stack offset

getSPReg

public java.lang.String getSPReg()

Get the stack pointer register

Returns:

register name

getFPReg

public java.lang.String getFPReg()

Get the frame pointer register

Returns:

register name

getThisReg

public java.lang.String getThisReg()

Get the register that holds 'this' pointer (note: this is esi)

Returns:

register name

getAccReg

public java.lang.String getAccReg()

Get the accumulator register (note: this is eax)

Returns:

register name

getEAXReg

public java.lang.String getEAXReg()

Get the eax register (note: this is the accumulator)

Returns:

register name

getEBXReg

public java.lang.String getEBXReg()

Get the ebx register

Returns:

register name

getECXReg

public java.lang.String getECXReg()

Get the ecx register

Returns:

register name

getEDXReg

public java.lang.String getEDXReg()

Get the edx register

Returns:

register name

getEDIReg

public java.lang.String getEDIReg()

Get the edi register

Returns:

register name

getESIReg

public java.lang.String getESIReg()

Get the esi register (note: this is 'this' register)

Returns:

register name

genComment

public void genComment(java.lang.String text)

Generate a comment

Parameters:

text - text to put in comment

genDataStart

public void genDataStart()

Generate the code to start the data section

genTextStart

public void genTextStart()

Generate the code to start the data section

genGlobal

public void genGlobal(java.lang.String label)

Generate a global

Parameters:

label - label to make global

genWord

public void genWord(java.lang.String dataWord)

Generate a data word

Parameters:

dataWord - word string

genByte

public void genByte(java.lang.String dataByte)

Generate a data byte

Parameters:

dataByte - byte string

genSpace

public void genSpace(int n)

Generate a data segment of size n

Parameters:

n - size of data segment

genAscii

public void genAscii(java.lang.String ascii)

Generate an ASCII string (terminates with zero byte and aligns)

Parameters:

ascii - ASCII string

genAlign

public void genAlign()

Generate word alignment directive

getLabel

public java.lang.String getLabel()

Get a unique label for use with control flow

Returns:

label string

getWordSize

public int getWordSize()

Get the word size

Returns:

word size

genMove

public void genMove(java.lang.String src,
                    java.lang.String destReg)

Generate a move instruction - a register-to-register move or a load address depending on whether the source parameter is a register or a label

Parameters:

src - string containing the source (register or label)

destReg - string containing the destination register

genMove

public void genMove(int imm,
                    java.lang.String destReg)

Generate a move instruction - loads an immediate into a register

Parameters:

imm - immediate to load into destination register

destReg - string containing the destination register

genMove

public void genMove(int offset,
                    java.lang.String baseReg,
                    java.lang.String destReg)

Generate a move instruction - loads a register value to memory

Parameters:

offset - integer offset (must be a multiple of the word size)

baseReg - string containing the base register

destReg - string containing the destination register

genMove

public void genMove(java.lang.String srcReg,
                    int offset,
                    java.lang.String baseReg)

Generate a move instruction - stores a register value to memory

Parameters:

srcReg - string containing the source register

offset - integer offset (must be a multiple of the word size)

baseReg - string containing the base register

genLoadByte

public void genLoadByte()

Generate a load byte instruction Note: uses the address in %esi (this register), increments %esi, and automatically puts result in the accumulator (%eax)

genStoreByte

public void genStoreByte()

Generate a store word instruction Note: uses the address in %edi, increments %edi, and takes the value from the accumulator (%eax)

genPush

public void genPush(java.lang.String reg)

Generate a push instruction

Parameters:

reg - string containing the register to push onto the stack

genPop

public void genPop(java.lang.String reg)

Generate a pop instruction

Parameters:

reg - string containing the register to hold popped stack value

genAdd

public void genAdd(java.lang.String srcReg,
                   java.lang.String destReg)

Generate an add instruction

Parameters:

srcReg - string containing the source register

destReg - string containing the destination register

genSub

public void genSub(java.lang.String srcReg,
                   java.lang.String destReg)

Generate a subtraction instruction

Parameters:

srcReg - string containing the source register

destReg - string containing the destination register

genMul

public void genMul(java.lang.String srcReg)

Generate a multiply instruction (note: puts result in %eax, also overwrites %edx with 0)

Parameters:

srcReg - string containing the source register

genDiv

public void genDiv(java.lang.String srcReg)

Generate a divide instruction (note: puts quotient in %eax and remainder in %edx)

Parameters:

srcReg - string containing the source register

genMod

public void genMod(java.lang.String srcReg)

Generate a modulus instruction (note: puts quotient in %eax and remainder in %edx)

Parameters:

srcReg - string containing the source register

genAnd

public void genAnd(java.lang.String srcReg,
                   java.lang.String destReg)

Generate an and instruction

Parameters:

srcReg - string containing the source register

destReg - string containing the destination register

genOr

public void genOr(java.lang.String srcReg,
                  java.lang.String destReg)

Generate an or instruction

Parameters:

srcReg - string containing the source register

destReg - string containing the destination register

genXor

public void genXor(java.lang.String srcReg,
                   java.lang.String destReg)

Generate an xor instruction

Parameters:

srcReg - string containing the source register

destReg - string containing the destination register

genShiftLeft

public void genShiftLeft(java.lang.String destReg)

Generate a shift left instruction (note: shift amount is taken from %ecx)

Parameters:

destReg - string containing the destination register

genShiftRight

public void genShiftRight(java.lang.String destReg)

Generate a shift right instruction (note: shift amount is taken from %ecx)

Parameters:

destReg - string containing the destination register

genNeg

public void genNeg(java.lang.String reg)

Generate a negation instruction

Parameters:

reg - string containing the source and destination register

genNot

public void genNot(java.lang.String reg)

Generate a not instruction

Parameters:

reg - string containing the source and destination register

genLabel

public void genLabel(java.lang.String label)

Generate a reference label

Parameters:

label - label string

genDirCall

public void genDirCall(java.lang.String label)

Generate a direct call

Parameters:

label - label string

genInDirCall

public void genInDirCall(java.lang.String reg)

Generate an indirect call

Parameters:

reg - register containing callee address

genRetn

public void genRetn()

Generate a return

genUncondBr

public void genUncondBr(java.lang.String label)

Generate an unconditional branch

Parameters:

label - label string

genCondBeq

public void genCondBeq(java.lang.String reg1,
                       java.lang.String reg2,
                       java.lang.String label)

Generate a conditional branch branches if first operand is equal to second operand

Parameters:

reg1 - first register to compare

reg2 - second register to compare

label - label to branch to

genCondBne

public void genCondBne(java.lang.String reg1,
                       java.lang.String reg2,
                       java.lang.String label)

Generate a conditional branch branches if first operand is not equal to second operand

Parameters:

reg1 - first register to compare

reg2 - second register to compare

label - label to branch to

genCondBlt

public void genCondBlt(java.lang.String reg1,
                       java.lang.String reg2,
                       java.lang.String label)

Generate a conditional branch branches if first operand is less than or equal to second operand

Parameters:

reg1 - first register to compare

reg2 - second register to compare

label - label to branch to

genCondBleq

public void genCondBleq(java.lang.String reg1,
                        java.lang.String reg2,
                        java.lang.String label)

Generate a conditional branch branches if first operand is less than second operand

Parameters:

reg1 - first register to compare

reg2 - second register to compare

label - label to branch to

genCondBgt

public void genCondBgt(java.lang.String reg1,
                       java.lang.String reg2,
                       java.lang.String label)

Generate a conditional branch branches if first operand is greater than second operand

Parameters:

reg1 - first register to compare

reg2 - second register to compare

label - label to branch to

genCondBgeq

public void genCondBgeq(java.lang.String reg1,
                        java.lang.String reg2,
                        java.lang.String label)

Generate a conditional branch branches if first operand is greater than or equal to second operand

Parameters:

reg1 - first register to compare

reg2 - second register to compare

label - label to branch to

genSyscall

public void genSyscall(int syscallId)

Generate a system call

Parameters:

syscallId - the system call number