Java Code Examples for com.android.dx.rop.code.RegisterSpecList#make()
The following examples show how to use
com.android.dx.rop.code.RegisterSpecList#make() .
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Example 1
| Source File: RopTranslator.java From Box with Apache License 2.0 | 6 votes |
|
/**
* Gets the complete register list (result and sources) out of a
* given rop instruction. For insns that are commutative, have
* two register sources, and have a source equal to the result,
* place that source first.
*
* @param insn {@code non-null;} instruction in question
* @param resultReg {@code null-ok;} the real result to use (ignore the insn's)
* @return {@code non-null;} the instruction's complete register list
*/
private static RegisterSpecList getRegs(Insn insn,
RegisterSpec resultReg) {
RegisterSpecList regs = insn.getSources();
if (insn.getOpcode().isCommutative()
&& (regs.size() == 2)
&& (resultReg.getReg() == regs.get(1).getReg())) {
/*
* For commutative ops which have two register sources,
* if the second source is the same register as the result,
* swap the sources so that an opcode of form 12x can be selected
* instead of one of form 23x
*/
regs = RegisterSpecList.make(regs.get(1), regs.get(0));
}
if (resultReg == null) {
return regs;
}
return regs.withFirst(resultReg);
}
Example 2
| Source File: RopTranslator.java From buck with Apache License 2.0 | 6 votes |
|
/**
* Gets the complete register list (result and sources) out of a
* given rop instruction. For insns that are commutative, have
* two register sources, and have a source equal to the result,
* place that source first.
*
* @param insn {@code non-null;} instruction in question
* @param resultReg {@code null-ok;} the real result to use (ignore the insn's)
* @return {@code non-null;} the instruction's complete register list
*/
private static RegisterSpecList getRegs(Insn insn,
RegisterSpec resultReg) {
RegisterSpecList regs = insn.getSources();
if (insn.getOpcode().isCommutative()
&& (regs.size() == 2)
&& (resultReg.getReg() == regs.get(1).getReg())) {
/*
* For commutative ops which have two register sources,
* if the second source is the same register as the result,
* swap the sources so that an opcode of form 12x can be selected
* instead of one of form 23x
*/
regs = RegisterSpecList.make(regs.get(1), regs.get(0));
}
if (resultReg == null) {
return regs;
}
return regs.withFirst(resultReg);
}
Example 3
| Source File: DalvInsn.java From J2ME-Loader with Apache License 2.0 | 6 votes |
|
/**
* Makes a move instruction, appropriate and ideal for the given arguments.
*
* @param position {@code non-null;} source position information
* @param dest {@code non-null;} destination register
* @param src {@code non-null;} source register
* @return {@code non-null;} an appropriately-constructed instance
*/
public static SimpleInsn makeMove(SourcePosition position,
RegisterSpec dest, RegisterSpec src) {
boolean category1 = dest.getCategory() == 1;
boolean reference = dest.getType().isReference();
int destReg = dest.getReg();
int srcReg = src.getReg();
Dop opcode;
if ((srcReg | destReg) < 16) {
opcode = reference ? Dops.MOVE_OBJECT :
(category1 ? Dops.MOVE : Dops.MOVE_WIDE);
} else if (destReg < 256) {
opcode = reference ? Dops.MOVE_OBJECT_FROM16 :
(category1 ? Dops.MOVE_FROM16 : Dops.MOVE_WIDE_FROM16);
} else {
opcode = reference ? Dops.MOVE_OBJECT_16 :
(category1 ? Dops.MOVE_16 : Dops.MOVE_WIDE_16);
}
return new SimpleInsn(opcode, position,
RegisterSpecList.make(dest, src));
}
Example 4
| Source File: RopTranslator.java From Box with Apache License 2.0 | 6 votes |
|
/**
* Gets the complete register list (result and sources) out of a
* given rop instruction. For insns that are commutative, have
* two register sources, and have a source equal to the result,
* place that source first.
*
* @param insn {@code non-null;} instruction in question
* @param resultReg {@code null-ok;} the real result to use (ignore the insn's)
* @return {@code non-null;} the instruction's complete register list
*/
private static RegisterSpecList getRegs(Insn insn,
RegisterSpec resultReg) {
RegisterSpecList regs = insn.getSources();
if (insn.getOpcode().isCommutative()
&& (regs.size() == 2)
&& (resultReg.getReg() == regs.get(1).getReg())) {
/*
* For commutative ops which have two register sources,
* if the second source is the same register as the result,
* swap the sources so that an opcode of form 12x can be selected
* instead of one of form 23x
*/
regs = RegisterSpecList.make(regs.get(1), regs.get(0));
}
if (resultReg == null) {
return regs;
}
return regs.withFirst(resultReg);
}
Example 5
| Source File: DalvInsn.java From Box with Apache License 2.0 | 6 votes |
|
/**
* Makes a move instruction, appropriate and ideal for the given arguments.
*
* @param position {@code non-null;} source position information
* @param dest {@code non-null;} destination register
* @param src {@code non-null;} source register
* @return {@code non-null;} an appropriately-constructed instance
*/
public static SimpleInsn makeMove(SourcePosition position,
RegisterSpec dest, RegisterSpec src) {
boolean category1 = dest.getCategory() == 1;
boolean reference = dest.getType().isReference();
int destReg = dest.getReg();
int srcReg = src.getReg();
Dop opcode;
if ((srcReg | destReg) < 16) {
opcode = reference ? Dops.MOVE_OBJECT :
(category1 ? Dops.MOVE : Dops.MOVE_WIDE);
} else if (destReg < 256) {
opcode = reference ? Dops.MOVE_OBJECT_FROM16 :
(category1 ? Dops.MOVE_FROM16 : Dops.MOVE_WIDE_FROM16);
} else {
opcode = reference ? Dops.MOVE_OBJECT_16 :
(category1 ? Dops.MOVE_16 : Dops.MOVE_WIDE_16);
}
return new SimpleInsn(opcode, position,
RegisterSpecList.make(dest, src));
}
Example 6
| Source File: DalvInsn.java From Box with Apache License 2.0 | 6 votes |
|
/**
* Makes a move instruction, appropriate and ideal for the given arguments.
*
* @param position {@code non-null;} source position information
* @param dest {@code non-null;} destination register
* @param src {@code non-null;} source register
* @return {@code non-null;} an appropriately-constructed instance
*/
public static SimpleInsn makeMove(SourcePosition position,
RegisterSpec dest, RegisterSpec src) {
boolean category1 = dest.getCategory() == 1;
boolean reference = dest.getType().isReference();
int destReg = dest.getReg();
int srcReg = src.getReg();
Dop opcode;
if ((srcReg | destReg) < 16) {
opcode = reference ? Dops.MOVE_OBJECT :
(category1 ? Dops.MOVE : Dops.MOVE_WIDE);
} else if (destReg < 256) {
opcode = reference ? Dops.MOVE_OBJECT_FROM16 :
(category1 ? Dops.MOVE_FROM16 : Dops.MOVE_WIDE_FROM16);
} else {
opcode = reference ? Dops.MOVE_OBJECT_16 :
(category1 ? Dops.MOVE_16 : Dops.MOVE_WIDE_16);
}
return new SimpleInsn(opcode, position,
RegisterSpecList.make(dest, src));
}
Example 7
| Source File: SsaBasicBlock.java From Box with Apache License 2.0 | 5 votes |
|
/**
* Adds a move instruction after the phi insn block.
*
* @param result move destination
* @param source move source
*/
public void addMoveToBeginning (RegisterSpec result, RegisterSpec source) {
if (result.getReg() == source.getReg()) {
// Sometimes we end up with no-op moves. Ignore them here.
return;
}
RegisterSpecList sources = RegisterSpecList.make(source);
NormalSsaInsn toAdd = new NormalSsaInsn(
new PlainInsn(Rops.opMove(result.getType()),
SourcePosition.NO_INFO, result, sources), this);
insns.add(getCountPhiInsns(), toAdd);
movesFromPhisAtBeginning++;
}
Example 8
| Source File: RopTranslator.java From Box with Apache License 2.0 | 5 votes |
|
/** {@inheritDoc} */
@Override
public void visitPlainCstInsn(PlainCstInsn insn) {
SourcePosition pos = insn.getPosition();
Dop opcode = RopToDop.dopFor(insn);
Rop rop = insn.getOpcode();
int ropOpcode = rop.getOpcode();
DalvInsn di;
if (rop.getBranchingness() != Rop.BRANCH_NONE) {
throw new RuntimeException("shouldn't happen");
}
if (ropOpcode == RegOps.MOVE_PARAM) {
if (!paramsAreInOrder) {
/*
* Parameters are not in order at the top of the reg space.
* We need to add moves.
*/
RegisterSpec dest = insn.getResult();
int param =
((CstInteger) insn.getConstant()).getValue();
RegisterSpec source =
RegisterSpec.make(regCount - paramSize + param,
dest.getType());
di = new SimpleInsn(opcode, pos,
RegisterSpecList.make(dest, source));
addOutput(di);
}
} else {
// No moves required for the parameters
RegisterSpecList regs = getRegs(insn);
di = new CstInsn(opcode, pos, regs, insn.getConstant());
addOutput(di);
}
}
Example 9
| Source File: SsaBasicBlock.java From Box with Apache License 2.0 | 5 votes |
|
/**
* Adds a move instruction after the phi insn block.
*
* @param result move destination
* @param source move source
*/
public void addMoveToBeginning (RegisterSpec result, RegisterSpec source) {
if (result.getReg() == source.getReg()) {
// Sometimes we end up with no-op moves. Ignore them here.
return;
}
RegisterSpecList sources = RegisterSpecList.make(source);
NormalSsaInsn toAdd = new NormalSsaInsn(
new PlainInsn(Rops.opMove(result.getType()),
SourcePosition.NO_INFO, result, sources), this);
insns.add(getCountPhiInsns(), toAdd);
movesFromPhisAtBeginning++;
}
Example 10
| Source File: RopTranslator.java From Box with Apache License 2.0 | 5 votes |
|
/** {@inheritDoc} */
@Override
public void visitPlainCstInsn(PlainCstInsn insn) {
SourcePosition pos = insn.getPosition();
Dop opcode = RopToDop.dopFor(insn);
Rop rop = insn.getOpcode();
int ropOpcode = rop.getOpcode();
DalvInsn di;
if (rop.getBranchingness() != Rop.BRANCH_NONE) {
throw new RuntimeException("shouldn't happen");
}
if (ropOpcode == RegOps.MOVE_PARAM) {
if (!paramsAreInOrder) {
/*
* Parameters are not in order at the top of the reg space.
* We need to add moves.
*/
RegisterSpec dest = insn.getResult();
int param =
((CstInteger) insn.getConstant()).getValue();
RegisterSpec source =
RegisterSpec.make(regCount - paramSize + param,
dest.getType());
di = new SimpleInsn(opcode, pos,
RegisterSpecList.make(dest, source));
addOutput(di);
}
} else {
// No moves required for the parameters
RegisterSpecList regs = getRegs(insn);
di = new CstInsn(opcode, pos, regs, insn.getConstant());
addOutput(di);
}
}
Example 11
| Source File: SsaBasicBlock.java From buck with Apache License 2.0 | 5 votes |
|
/**
* Adds a move instruction after the phi insn block.
*
* @param result move destination
* @param source move source
*/
public void addMoveToBeginning (RegisterSpec result, RegisterSpec source) {
if (result.getReg() == source.getReg()) {
// Sometimes we end up with no-op moves. Ignore them here.
return;
}
RegisterSpecList sources = RegisterSpecList.make(source);
NormalSsaInsn toAdd = new NormalSsaInsn(
new PlainInsn(Rops.opMove(result.getType()),
SourcePosition.NO_INFO, result, sources), this);
insns.add(getCountPhiInsns(), toAdd);
movesFromPhisAtBeginning++;
}
Example 12
| Source File: SsaBasicBlock.java From J2ME-Loader with Apache License 2.0 | 5 votes |
|
/**
* Adds a move instruction after the phi insn block.
*
* @param result move destination
* @param source move source
*/
public void addMoveToBeginning (RegisterSpec result, RegisterSpec source) {
if (result.getReg() == source.getReg()) {
// Sometimes we end up with no-op moves. Ignore them here.
return;
}
RegisterSpecList sources = RegisterSpecList.make(source);
NormalSsaInsn toAdd = new NormalSsaInsn(
new PlainInsn(Rops.opMove(result.getType()),
SourcePosition.NO_INFO, result, sources), this);
insns.add(getCountPhiInsns(), toAdd);
movesFromPhisAtBeginning++;
}
Example 13
| Source File: RopTranslator.java From buck with Apache License 2.0 | 5 votes |
|
/** {@inheritDoc} */
public void visitPlainCstInsn(PlainCstInsn insn) {
SourcePosition pos = insn.getPosition();
Dop opcode = RopToDop.dopFor(insn);
Rop rop = insn.getOpcode();
int ropOpcode = rop.getOpcode();
DalvInsn di;
if (rop.getBranchingness() != Rop.BRANCH_NONE) {
throw new RuntimeException("shouldn't happen");
}
if (ropOpcode == RegOps.MOVE_PARAM) {
if (!paramsAreInOrder) {
/*
* Parameters are not in order at the top of the reg space.
* We need to add moves.
*/
RegisterSpec dest = insn.getResult();
int param =
((CstInteger) insn.getConstant()).getValue();
RegisterSpec source =
RegisterSpec.make(regCount - paramSize + param,
dest.getType());
di = new SimpleInsn(opcode, pos,
RegisterSpecList.make(dest, source));
addOutput(di);
}
} else {
// No moves required for the parameters
RegisterSpecList regs = getRegs(insn);
di = new CstInsn(opcode, pos, regs, insn.getConstant());
addOutput(di);
}
}
Example 14
| Source File: SsaBasicBlock.java From Box with Apache License 2.0 | 4 votes |
|
/**
* Adds a move instruction to the end of this basic block, just
* before the last instruction. If the result of the final instruction
* is the source in question, then the move is placed at the beginning of
* the primary successor block. This is for unversioned registers.
*
* @param result move destination
* @param source move source
*/
public void addMoveToEnd(RegisterSpec result, RegisterSpec source) {
/*
* Check that there are no other successors otherwise we may
* insert a move that affects those (b/69128828).
*/
if (successors.cardinality() > 1) {
throw new IllegalStateException("Inserting a move to a block with multiple successors");
}
if (result.getReg() == source.getReg()) {
// Sometimes we end up with no-op moves. Ignore them here.
return;
}
/*
* The last Insn has to be a normal SSA insn: a phi can't branch
* or return or cause an exception, etc.
*/
NormalSsaInsn lastInsn;
lastInsn = (NormalSsaInsn)insns.get(insns.size()-1);
if (lastInsn.getResult() != null || lastInsn.getSources().size() > 0) {
/*
* The final insn in this block has a source or result
* register, and the moves we may need to place and
* schedule may interfere. We need to insert this
* instruction at the beginning of the primary successor
* block instead. We know this is safe, because when we
* edge-split earlier, we ensured that each successor has
* only us as a predecessor.
*/
for (int i = successors.nextSetBit(0)
; i >= 0
; i = successors.nextSetBit(i + 1)) {
SsaBasicBlock succ;
succ = parent.getBlocks().get(i);
succ.addMoveToBeginning(result, source);
}
} else {
/*
* We can safely add a move to the end of the block just
* before the last instruction, because the final insn does
* not assign to anything.
*/
RegisterSpecList sources = RegisterSpecList.make(source);
NormalSsaInsn toAdd = new NormalSsaInsn(
new PlainInsn(Rops.opMove(result.getType()),
SourcePosition.NO_INFO, result, sources), this);
insns.add(insns.size() - 1, toAdd);
movesFromPhisAtEnd++;
}
}
Example 15
| Source File: SsaRenamer.java From Box with Apache License 2.0 | 4 votes |
|
/**
* {@inheritDoc}
*
* Move insns are treated as a simple mapping operation, and
* will later be removed unless they represent a local variable
* assignment. If they represent a local variable assignement, they
* are preserved.
*/
@Override
public void visitMoveInsn(NormalSsaInsn insn) {
/*
* For moves: copy propogate the move if we can, but don't
* if we need to preserve local variable info and the
* result has a different name than the source.
*/
RegisterSpec ropResult = insn.getResult();
int ropResultReg = ropResult.getReg();
int ropSourceReg = insn.getSources().get(0).getReg();
insn.mapSourceRegisters(mapper);
int ssaSourceReg = insn.getSources().get(0).getReg();
LocalItem sourceLocal
= currentMapping[ropSourceReg].getLocalItem();
LocalItem resultLocal = ropResult.getLocalItem();
/*
* A move from a register that's currently associated with a local
* to one that will not be associated with a local does not need
* to be preserved, but the local association should remain.
* Hence, we inherit the sourceLocal where the resultLocal is null.
*/
LocalItem newLocal
= (resultLocal == null) ? sourceLocal : resultLocal;
LocalItem associatedLocal = getLocalForNewReg(ssaSourceReg);
/*
* If we take the new local, will only one local have ever
* been associated with this SSA reg?
*/
boolean onlyOneAssociatedLocal
= associatedLocal == null || newLocal == null
|| newLocal.equals(associatedLocal);
/*
* If we're going to copy-propogate, then the ssa register
* spec that's going to go into the mapping is made up of
* the source register number mapped from above, the type
* of the result, and the name either from the result (if
* specified) or inherited from the existing mapping.
*
* The move source has incomplete type information in null
* object cases, so the result type is used.
*/
RegisterSpec ssaReg
= RegisterSpec.makeLocalOptional(
ssaSourceReg, ropResult.getType(), newLocal);
if (!Optimizer.getPreserveLocals() || (onlyOneAssociatedLocal
&& equalsHandlesNulls(newLocal, sourceLocal)) &&
threshold == 0) {
/*
* We don't have to keep this move to preserve local
* information. Either the name is the same, or the result
* register spec is unnamed.
*/
addMapping(ropResultReg, ssaReg);
} else if (onlyOneAssociatedLocal && sourceLocal == null &&
threshold == 0) {
/*
* The register was previously unnamed. This means that a
* local starts after it's first assignment in SSA form
*/
RegisterSpecList ssaSources = RegisterSpecList.make(
RegisterSpec.make(ssaReg.getReg(),
ssaReg.getType(), newLocal));
SsaInsn newInsn
= SsaInsn.makeFromRop(
new PlainInsn(Rops.opMarkLocal(ssaReg),
SourcePosition.NO_INFO, null, ssaSources),block);
insnsToReplace.put(insn, newInsn);
// Just map as above.
addMapping(ropResultReg, ssaReg);
} else {
/*
* Do not copy-propogate, since the two registers have
* two different local-variable names.
*/
processResultReg(insn);
movesToKeep.add(insn);
}
}
Example 16
| Source File: SsaRenamer.java From Box with Apache License 2.0 | 4 votes |
|
/**
* {@inheritDoc}
*
* Move insns are treated as a simple mapping operation, and
* will later be removed unless they represent a local variable
* assignment. If they represent a local variable assignement, they
* are preserved.
*/
@Override
public void visitMoveInsn(NormalSsaInsn insn) {
/*
* For moves: copy propogate the move if we can, but don't
* if we need to preserve local variable info and the
* result has a different name than the source.
*/
RegisterSpec ropResult = insn.getResult();
int ropResultReg = ropResult.getReg();
int ropSourceReg = insn.getSources().get(0).getReg();
insn.mapSourceRegisters(mapper);
int ssaSourceReg = insn.getSources().get(0).getReg();
LocalItem sourceLocal
= currentMapping[ropSourceReg].getLocalItem();
LocalItem resultLocal = ropResult.getLocalItem();
/*
* A move from a register that's currently associated with a local
* to one that will not be associated with a local does not need
* to be preserved, but the local association should remain.
* Hence, we inherit the sourceLocal where the resultLocal is null.
*/
LocalItem newLocal
= (resultLocal == null) ? sourceLocal : resultLocal;
LocalItem associatedLocal = getLocalForNewReg(ssaSourceReg);
/*
* If we take the new local, will only one local have ever
* been associated with this SSA reg?
*/
boolean onlyOneAssociatedLocal
= associatedLocal == null || newLocal == null
|| newLocal.equals(associatedLocal);
/*
* If we're going to copy-propogate, then the ssa register
* spec that's going to go into the mapping is made up of
* the source register number mapped from above, the type
* of the result, and the name either from the result (if
* specified) or inherited from the existing mapping.
*
* The move source has incomplete type information in null
* object cases, so the result type is used.
*/
RegisterSpec ssaReg
= RegisterSpec.makeLocalOptional(
ssaSourceReg, ropResult.getType(), newLocal);
if (!Optimizer.getPreserveLocals() || (onlyOneAssociatedLocal
&& equalsHandlesNulls(newLocal, sourceLocal)) &&
threshold == 0) {
/*
* We don't have to keep this move to preserve local
* information. Either the name is the same, or the result
* register spec is unnamed.
*/
addMapping(ropResultReg, ssaReg);
} else if (onlyOneAssociatedLocal && sourceLocal == null &&
threshold == 0) {
/*
* The register was previously unnamed. This means that a
* local starts after it's first assignment in SSA form
*/
RegisterSpecList ssaSources = RegisterSpecList.make(
RegisterSpec.make(ssaReg.getReg(),
ssaReg.getType(), newLocal));
SsaInsn newInsn
= SsaInsn.makeFromRop(
new PlainInsn(Rops.opMarkLocal(ssaReg),
SourcePosition.NO_INFO, null, ssaSources),block);
insnsToReplace.put(insn, newInsn);
// Just map as above.
addMapping(ropResultReg, ssaReg);
} else {
/*
* Do not copy-propogate, since the two registers have
* two different local-variable names.
*/
processResultReg(insn);
movesToKeep.add(insn);
}
}
Example 17
| Source File: SsaBasicBlock.java From Box with Apache License 2.0 | 4 votes |
|
/**
* Adds a move instruction to the end of this basic block, just
* before the last instruction. If the result of the final instruction
* is the source in question, then the move is placed at the beginning of
* the primary successor block. This is for unversioned registers.
*
* @param result move destination
* @param source move source
*/
public void addMoveToEnd(RegisterSpec result, RegisterSpec source) {
/*
* Check that there are no other successors otherwise we may
* insert a move that affects those (b/69128828).
*/
if (successors.cardinality() > 1) {
throw new IllegalStateException("Inserting a move to a block with multiple successors");
}
if (result.getReg() == source.getReg()) {
// Sometimes we end up with no-op moves. Ignore them here.
return;
}
/*
* The last Insn has to be a normal SSA insn: a phi can't branch
* or return or cause an exception, etc.
*/
NormalSsaInsn lastInsn;
lastInsn = (NormalSsaInsn)insns.get(insns.size()-1);
if (lastInsn.getResult() != null || lastInsn.getSources().size() > 0) {
/*
* The final insn in this block has a source or result
* register, and the moves we may need to place and
* schedule may interfere. We need to insert this
* instruction at the beginning of the primary successor
* block instead. We know this is safe, because when we
* edge-split earlier, we ensured that each successor has
* only us as a predecessor.
*/
for (int i = successors.nextSetBit(0)
; i >= 0
; i = successors.nextSetBit(i + 1)) {
SsaBasicBlock succ;
succ = parent.getBlocks().get(i);
succ.addMoveToBeginning(result, source);
}
} else {
/*
* We can safely add a move to the end of the block just
* before the last instruction, because the final insn does
* not assign to anything.
*/
RegisterSpecList sources = RegisterSpecList.make(source);
NormalSsaInsn toAdd = new NormalSsaInsn(
new PlainInsn(Rops.opMove(result.getType()),
SourcePosition.NO_INFO, result, sources), this);
insns.add(insns.size() - 1, toAdd);
movesFromPhisAtEnd++;
}
}
Example 18
| Source File: SsaRenamer.java From buck with Apache License 2.0 | 4 votes |
|
/**
* {@inheritDoc}
*
* Move insns are treated as a simple mapping operation, and
* will later be removed unless they represent a local variable
* assignment. If they represent a local variable assignement, they
* are preserved.
*/
public void visitMoveInsn(NormalSsaInsn insn) {
/*
* For moves: copy propogate the move if we can, but don't
* if we need to preserve local variable info and the
* result has a different name than the source.
*/
RegisterSpec ropResult = insn.getResult();
int ropResultReg = ropResult.getReg();
int ropSourceReg = insn.getSources().get(0).getReg();
insn.mapSourceRegisters(mapper);
int ssaSourceReg = insn.getSources().get(0).getReg();
LocalItem sourceLocal
= currentMapping[ropSourceReg].getLocalItem();
LocalItem resultLocal = ropResult.getLocalItem();
/*
* A move from a register that's currently associated with a local
* to one that will not be associated with a local does not need
* to be preserved, but the local association should remain.
* Hence, we inherit the sourceLocal where the resultLocal is null.
*/
LocalItem newLocal
= (resultLocal == null) ? sourceLocal : resultLocal;
LocalItem associatedLocal = getLocalForNewReg(ssaSourceReg);
/*
* If we take the new local, will only one local have ever
* been associated with this SSA reg?
*/
boolean onlyOneAssociatedLocal
= associatedLocal == null || newLocal == null
|| newLocal.equals(associatedLocal);
/*
* If we're going to copy-propogate, then the ssa register
* spec that's going to go into the mapping is made up of
* the source register number mapped from above, the type
* of the result, and the name either from the result (if
* specified) or inherited from the existing mapping.
*
* The move source has incomplete type information in null
* object cases, so the result type is used.
*/
RegisterSpec ssaReg
= RegisterSpec.makeLocalOptional(
ssaSourceReg, ropResult.getType(), newLocal);
if (!Optimizer.getPreserveLocals() || (onlyOneAssociatedLocal
&& equalsHandlesNulls(newLocal, sourceLocal)) &&
threshold == 0) {
/*
* We don't have to keep this move to preserve local
* information. Either the name is the same, or the result
* register spec is unnamed.
*/
addMapping(ropResultReg, ssaReg);
} else if (onlyOneAssociatedLocal && sourceLocal == null &&
threshold == 0) {
/*
* The register was previously unnamed. This means that a
* local starts after it's first assignment in SSA form
*/
RegisterSpecList ssaSources = RegisterSpecList.make(
RegisterSpec.make(ssaReg.getReg(),
ssaReg.getType(), newLocal));
SsaInsn newInsn
= SsaInsn.makeFromRop(
new PlainInsn(Rops.opMarkLocal(ssaReg),
SourcePosition.NO_INFO, null, ssaSources),block);
insnsToReplace.put(insn, newInsn);
// Just map as above.
addMapping(ropResultReg, ssaReg);
} else {
/*
* Do not copy-propogate, since the two registers have
* two different local-variable names.
*/
processResultReg(insn);
movesToKeep.add(insn);
}
}
Example 19
| Source File: SsaRenamer.java From J2ME-Loader with Apache License 2.0 | 4 votes |
|
/**
* {@inheritDoc}
*
* Move insns are treated as a simple mapping operation, and
* will later be removed unless they represent a local variable
* assignment. If they represent a local variable assignement, they
* are preserved.
*/
@Override
public void visitMoveInsn(NormalSsaInsn insn) {
/*
* For moves: copy propogate the move if we can, but don't
* if we need to preserve local variable info and the
* result has a different name than the source.
*/
RegisterSpec ropResult = insn.getResult();
int ropResultReg = ropResult.getReg();
int ropSourceReg = insn.getSources().get(0).getReg();
insn.mapSourceRegisters(mapper);
int ssaSourceReg = insn.getSources().get(0).getReg();
LocalItem sourceLocal
= currentMapping[ropSourceReg].getLocalItem();
LocalItem resultLocal = ropResult.getLocalItem();
/*
* A move from a register that's currently associated with a local
* to one that will not be associated with a local does not need
* to be preserved, but the local association should remain.
* Hence, we inherit the sourceLocal where the resultLocal is null.
*/
LocalItem newLocal
= (resultLocal == null) ? sourceLocal : resultLocal;
LocalItem associatedLocal = getLocalForNewReg(ssaSourceReg);
/*
* If we take the new local, will only one local have ever
* been associated with this SSA reg?
*/
boolean onlyOneAssociatedLocal
= associatedLocal == null || newLocal == null
|| newLocal.equals(associatedLocal);
/*
* If we're going to copy-propogate, then the ssa register
* spec that's going to go into the mapping is made up of
* the source register number mapped from above, the type
* of the result, and the name either from the result (if
* specified) or inherited from the existing mapping.
*
* The move source has incomplete type information in null
* object cases, so the result type is used.
*/
RegisterSpec ssaReg
= RegisterSpec.makeLocalOptional(
ssaSourceReg, ropResult.getType(), newLocal);
if (!Optimizer.getPreserveLocals() || (onlyOneAssociatedLocal
&& equalsHandlesNulls(newLocal, sourceLocal)) &&
threshold == 0) {
/*
* We don't have to keep this move to preserve local
* information. Either the name is the same, or the result
* register spec is unnamed.
*/
addMapping(ropResultReg, ssaReg);
} else if (onlyOneAssociatedLocal && sourceLocal == null &&
threshold == 0) {
/*
* The register was previously unnamed. This means that a
* local starts after it's first assignment in SSA form
*/
RegisterSpecList ssaSources = RegisterSpecList.make(
RegisterSpec.make(ssaReg.getReg(),
ssaReg.getType(), newLocal));
SsaInsn newInsn
= SsaInsn.makeFromRop(
new PlainInsn(Rops.opMarkLocal(ssaReg),
SourcePosition.NO_INFO, null, ssaSources),block);
insnsToReplace.put(insn, newInsn);
// Just map as above.
addMapping(ropResultReg, ssaReg);
} else {
/*
* Do not copy-propogate, since the two registers have
* two different local-variable names.
*/
processResultReg(insn);
movesToKeep.add(insn);
}
}
Example 20
| Source File: SsaBasicBlock.java From J2ME-Loader with Apache License 2.0 | 4 votes |
|
/**
* Adds a move instruction to the end of this basic block, just
* before the last instruction. If the result of the final instruction
* is the source in question, then the move is placed at the beginning of
* the primary successor block. This is for unversioned registers.
*
* @param result move destination
* @param source move source
*/
public void addMoveToEnd(RegisterSpec result, RegisterSpec source) {
if (result.getReg() == source.getReg()) {
// Sometimes we end up with no-op moves. Ignore them here.
return;
}
/*
* The last Insn has to be a normal SSA insn: a phi can't branch
* or return or cause an exception, etc.
*/
NormalSsaInsn lastInsn;
lastInsn = (NormalSsaInsn)insns.get(insns.size()-1);
if (lastInsn.getResult() != null || lastInsn.getSources().size() > 0) {
/*
* The final insn in this block has a source or result
* register, and the moves we may need to place and
* schedule may interfere. We need to insert this
* instruction at the beginning of the primary successor
* block instead. We know this is safe, because when we
* edge-split earlier, we ensured that each successor has
* only us as a predecessor.
*/
for (int i = successors.nextSetBit(0)
; i >= 0
; i = successors.nextSetBit(i + 1)) {
SsaBasicBlock succ;
succ = parent.getBlocks().get(i);
succ.addMoveToBeginning(result, source);
}
} else {
/*
* We can safely add a move to the end of the block just
* before the last instruction, because the final insn does
* not assign to anything.
*/
RegisterSpecList sources = RegisterSpecList.make(source);
NormalSsaInsn toAdd = new NormalSsaInsn(
new PlainInsn(Rops.opMove(result.getType()),
SourcePosition.NO_INFO, result, sources), this);
insns.add(insns.size() - 1, toAdd);
movesFromPhisAtEnd++;
}
}
