PPC
Class Frame

java.lang.Object
  Translate.Frame
      PPC.Frame

Direct Known Subclasses:

Frame.Darwin, Frame.Linux

public abstract class Frame
extends Frame

Represents PowerPC stack frames.

ppc stack frames look like this after procedure prolog has been executed: Higher address: ......... +-------------------------------+ | caller's LR | +-------------------------------+ | caller's CR | +-------------------------------+ Caller's SP->| caller's caller's sp | ^^ Caller's Frame ^^ +===============================+ vv Callee's Frame vv | Save Area for | FPF 31 .......... | Caller's FPF's | FPF n +-------------------------------+ | Save Area for | GRF 31 .......... | Caller's GRF's | GRF n +-------------------------------+ | alignment pad | ............ | (if necessary) | +-------------------------------+ | Local | ........ | Variables | +-------------------------------+ SP + X -> | aN for FUTURE call | +-------------------------------+ .......... +-------------------------------+ SP + 28 -> | a1 for FUTURE call | +-------------------------------+ SP + 24 -> | a0 for FUTURE call | +-------------------------------+ SP + 20 -> | caller's TOC | +-------------------------------+ SP + 16 -> | reserved | +-------------------------------+ SP + 12 -> | reserved | +-------------------------------+ SP + 8 -> | LR callee-save for FUTURE call| +-------------------------------+ SP + 4 -> | CR callee-save for FUTURE call| +-------------------------------+ SP -> | caller's sp | +===============================+ Lower address: NOTE: All state with the exception of LR and CR are saved in the callee's frame. LR and CR are saved in the CALLER'S FRAME. ALSO NOTE: Args to the callee are found in the caller's frame.

Nested Class Summary

static class	Frame.Darwin
static class	Frame.Linux

Nested classes/interfaces inherited from class Translate.Frame

Frame.Access

Field Summary

protected java.util.LinkedList<java.lang.String>	picsymbols
Temp	RV

Fields inherited from class Translate.Frame

formals, maxArgsOut, name

Method Summary

Frame.Access	allocFormal(Temp t) Allocate a formal parameter represented by temporary t.
Frame.Access	allocLocal(Temp t) Allocate a local variable represented by temporary t.
Temp.Label	badPtr() Get the label to branch to for null pointers
Temp.Label	badSub() Get the label to branch to for bad subscripts
Tree.Visitor<java.util.LinkedList<Instr>,Temp>	codegen() Obtain a code generator visitor for the target, producing a list of assembler instructions.
void	procEntryExit1(java.util.LinkedList<Tree.Stm> body) Wrap the statement tree body of a procedure with entry/exit after translation.
void	procEntryExit2(java.util.LinkedList<Instr> insns) Wrap the assembly body of a procedure with entry/exit after code generation.
void	procEntryExit3(java.util.LinkedList<Instr> insns, Temp.Map map) Wrap the assembly body of a procedure with entry/exit after register allocation.
java.lang.String	record(Temp.Label lab, int words) Allocate a zeroed static record
Temp[]	registers() The registers supported by this target.
Tree.Exp	RV() An expression for the return value of this frame.
java.lang.String	string(Temp.Label lab, java.lang.String string) Allocate an initialized static string literal.
java.lang.String	vtable(Temp.Label lab, java.util.Collection<Temp.Label> values) Allocate and initialize a static virtual dispatch table
int	wordSize() The word size (in bytes) of this target.

Methods inherited from class Translate.Frame

external, mainFrame, newFrame

Methods inherited from class java.lang.Object

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

Field Detail

RV

public Temp RV

picsymbols

protected java.util.LinkedList<java.lang.String> picsymbols

Method Detail

wordSize

public int wordSize()

Description copied from class: Frame

The word size (in bytes) of this target.

Specified by:

wordSize in class Frame

allocFormal

public Frame.Access allocFormal(Temp t)

Description copied from class: Frame

Allocate a formal parameter represented by temporary t. If t is null, then allocate the parameter in the frame.

Specified by:

allocFormal in class Frame

allocLocal

public Frame.Access allocLocal(Temp t)

Description copied from class: Frame

Allocate a local variable represented by temporary t. If t is null, then allocate the variable in the frame.

Specified by:

allocLocal in class Frame

registers

public Temp[] registers()

Description copied from class: Frame

The registers supported by this target.

Specified by:

registers in class Frame

RV

public Tree.Exp RV()

Description copied from class: Frame

An expression for the return value of this frame.

Specified by:

RV in class Frame

string

public java.lang.String string(Temp.Label lab,
                               java.lang.String string)

Description copied from class: Frame

Allocate an initialized static string literal.

Specified by:

string in class Frame

Parameters:

lab - the label to use for the string

string - the value of the literal

Returns:

the assembler data fragment

record

public java.lang.String record(Temp.Label lab,
                               int words)

Description copied from class: Frame

Allocate a zeroed static record

Specified by:

record in class Frame

Parameters:

lab - the label to use for the record

words - the size of the record in words

Returns:

the assembler data fragment

vtable

public java.lang.String vtable(Temp.Label lab,
                               java.util.Collection<Temp.Label> values)

Description copied from class: Frame

Allocate and initialize a static virtual dispatch table

Specified by:

vtable in class Frame

Parameters:

lab - the label to use for the record

values - the labels of the methods in the table

Returns:

the assembler data fragment

badPtr

public Temp.Label badPtr()

Description copied from class: Frame

Get the label to branch to for null pointers

Specified by:

badPtr in class Frame

Returns:

the label

badSub

public Temp.Label badSub()

Description copied from class: Frame

Get the label to branch to for bad subscripts

Specified by:

badSub in class Frame

Returns:

the label

procEntryExit1

public void procEntryExit1(java.util.LinkedList<Tree.Stm> body)

Description copied from class: Frame

Wrap the statement tree body of a procedure with entry/exit after translation.

Specified by:

procEntryExit1 in class Frame

Parameters:

body - the procedure body

codegen

public Tree.Visitor<java.util.LinkedList<Instr>,Temp> codegen()

Description copied from class: Frame

Obtain a code generator visitor for the target, producing a list of assembler instructions.

Specified by:

codegen in class Frame

Returns:

the code generator visitor

procEntryExit2

public void procEntryExit2(java.util.LinkedList<Instr> insns)

Description copied from class: Frame

Wrap the assembly body of a procedure with entry/exit after code generation.

Specified by:

procEntryExit2 in class Frame

Parameters:

insns - the procedure body

procEntryExit3

public void procEntryExit3(java.util.LinkedList<Instr> insns,
                           Temp.Map map)

Description copied from class: Frame

Wrap the assembly body of a procedure with entry/exit after register allocation.

Specified by:

procEntryExit3 in class Frame

Parameters:

insns - the procedure body

map - the register allocation mapping temporaries to hard registers