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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
namespace art {
/*
* This file contains target-independent codegen and support, and is
* included by:
*
* $(TARGET_ARCH)/Codegen-$(TARGET_ARCH_VARIANT).c
*
* which combines this common code with specific support found in the
* applicable directories below this one.
*
*/
/*
* Load an immediate value into a fixed or temp register. Target
* register is clobbered, and marked inUse.
*/
LIR* loadConstant(CompilationUnit* cUnit, int rDest, int value)
{
if (oatIsTemp(cUnit, rDest)) {
oatClobber(cUnit, rDest);
oatMarkInUse(cUnit, rDest);
}
return loadConstantNoClobber(cUnit, rDest, value);
}
/* Load a word at base + displacement. Displacement must be word multiple */
LIR* loadWordDisp(CompilationUnit* cUnit, int rBase, int displacement,
int rDest)
{
return loadBaseDisp(cUnit, rBase, displacement, rDest, kWord,
INVALID_SREG);
}
LIR* storeWordDisp(CompilationUnit* cUnit, int rBase, int displacement,
int rSrc)
{
return storeBaseDisp(cUnit, rBase, displacement, rSrc, kWord);
}
/*
* Load a Dalvik register into a physical register. Take care when
* using this routine, as it doesn't perform any bookkeeping regarding
* register liveness. That is the responsibility of the caller.
*/
void loadValueDirect(CompilationUnit* cUnit, RegLocation rlSrc, int rDest)
{
rlSrc = oatUpdateLoc(cUnit, rlSrc);
if (rlSrc.location == kLocPhysReg) {
opRegCopy(cUnit, rDest, rlSrc.lowReg);
} else {
DCHECK((rlSrc.location == kLocDalvikFrame) ||
(rlSrc.location == kLocCompilerTemp));
loadWordDisp(cUnit, rSP, oatSRegOffset(cUnit, rlSrc.sRegLow), rDest);
}
}
/*
* Similar to loadValueDirect, but clobbers and allocates the target
* register. Should be used when loading to a fixed register (for example,
* loading arguments to an out of line call.
*/
void loadValueDirectFixed(CompilationUnit* cUnit, RegLocation rlSrc, int rDest)
{
oatClobber(cUnit, rDest);
oatMarkInUse(cUnit, rDest);
loadValueDirect(cUnit, rlSrc, rDest);
}
/*
* Load a Dalvik register pair into a physical register[s]. Take care when
* using this routine, as it doesn't perform any bookkeeping regarding
* register liveness. That is the responsibility of the caller.
*/
void loadValueDirectWide(CompilationUnit* cUnit, RegLocation rlSrc, int regLo,
int regHi)
{
rlSrc = oatUpdateLocWide(cUnit, rlSrc);
if (rlSrc.location == kLocPhysReg) {
opRegCopyWide(cUnit, regLo, regHi, rlSrc.lowReg, rlSrc.highReg);
} else {
DCHECK((rlSrc.location == kLocDalvikFrame) ||
(rlSrc.location == kLocCompilerTemp));
loadBaseDispWide(cUnit, rSP, oatSRegOffset(cUnit, rlSrc.sRegLow),
regLo, regHi, INVALID_SREG);
}
}
/*
* Similar to loadValueDirect, but clobbers and allocates the target
* registers. Should be used when loading to a fixed registers (for example,
* loading arguments to an out of line call.
*/
void loadValueDirectWideFixed(CompilationUnit* cUnit, RegLocation rlSrc,
int regLo, int regHi)
{
oatClobber(cUnit, regLo);
oatClobber(cUnit, regHi);
oatMarkInUse(cUnit, regLo);
oatMarkInUse(cUnit, regHi);
loadValueDirectWide(cUnit, rlSrc, regLo, regHi);
}
RegLocation loadValue(CompilationUnit* cUnit, RegLocation rlSrc,
RegisterClass opKind)
{
rlSrc = oatEvalLoc(cUnit, rlSrc, opKind, false);
if (rlSrc.location != kLocPhysReg) {
DCHECK((rlSrc.location == kLocDalvikFrame) ||
(rlSrc.location == kLocCompilerTemp));
loadValueDirect(cUnit, rlSrc, rlSrc.lowReg);
rlSrc.location = kLocPhysReg;
oatMarkLive(cUnit, rlSrc.lowReg, rlSrc.sRegLow);
}
return rlSrc;
}
void storeValue(CompilationUnit* cUnit, RegLocation rlDest, RegLocation rlSrc)
{
#ifndef NDEBUG
/*
* Sanity checking - should never try to store to the same
* ssa name during the compilation of a single instruction
* without an intervening oatClobberSReg().
*/
DCHECK((cUnit->liveSReg == INVALID_SREG) ||
(rlDest.sRegLow != cUnit->liveSReg));
cUnit->liveSReg = rlDest.sRegLow;
#endif
LIR* defStart;
LIR* defEnd;
DCHECK(!rlDest.wide);
DCHECK(!rlSrc.wide);
rlSrc = oatUpdateLoc(cUnit, rlSrc);
rlDest = oatUpdateLoc(cUnit, rlDest);
if (rlSrc.location == kLocPhysReg) {
if (oatIsLive(cUnit, rlSrc.lowReg) ||
oatIsPromoted(cUnit, rlSrc.lowReg) ||
(rlDest.location == kLocPhysReg)) {
// Src is live/promoted or Dest has assigned reg.
rlDest = oatEvalLoc(cUnit, rlDest, kAnyReg, false);
opRegCopy(cUnit, rlDest.lowReg, rlSrc.lowReg);
} else {
// Just re-assign the registers. Dest gets Src's regs
rlDest.lowReg = rlSrc.lowReg;
oatClobber(cUnit, rlSrc.lowReg);
}
} else {
// Load Src either into promoted Dest or temps allocated for Dest
rlDest = oatEvalLoc(cUnit, rlDest, kAnyReg, false);
loadValueDirect(cUnit, rlSrc, rlDest.lowReg);
}
// Dest is now live and dirty (until/if we flush it to home location)
oatMarkLive(cUnit, rlDest.lowReg, rlDest.sRegLow);
oatMarkDirty(cUnit, rlDest);
oatResetDefLoc(cUnit, rlDest);
if (oatIsDirty(cUnit, rlDest.lowReg) &&
oatLiveOut(cUnit, rlDest.sRegLow)) {
defStart = (LIR* )cUnit->lastLIRInsn;
storeBaseDisp(cUnit, rSP, oatSRegOffset(cUnit, rlDest.sRegLow),
rlDest.lowReg, kWord);
oatMarkClean(cUnit, rlDest);
defEnd = (LIR* )cUnit->lastLIRInsn;
oatMarkDef(cUnit, rlDest, defStart, defEnd);
}
}
RegLocation loadValueWide(CompilationUnit* cUnit, RegLocation rlSrc,
RegisterClass opKind)
{
DCHECK(rlSrc.wide);
rlSrc = oatEvalLoc(cUnit, rlSrc, opKind, false);
if (rlSrc.location != kLocPhysReg) {
DCHECK((rlSrc.location == kLocDalvikFrame) ||
(rlSrc.location == kLocCompilerTemp));
loadValueDirectWide(cUnit, rlSrc, rlSrc.lowReg, rlSrc.highReg);
rlSrc.location = kLocPhysReg;
oatMarkLive(cUnit, rlSrc.lowReg, rlSrc.sRegLow);
oatMarkLive(cUnit, rlSrc.highReg,
oatSRegHi(rlSrc.sRegLow));
}
return rlSrc;
}
void storeValueWide(CompilationUnit* cUnit, RegLocation rlDest,
RegLocation rlSrc)
{
#ifndef NDEBUG
/*
* Sanity checking - should never try to store to the same
* ssa name during the compilation of a single instruction
* without an intervening oatClobberSReg().
*/
DCHECK((cUnit->liveSReg == INVALID_SREG) ||
(rlDest.sRegLow != cUnit->liveSReg));
cUnit->liveSReg = rlDest.sRegLow;
#endif
LIR* defStart;
LIR* defEnd;
DCHECK_EQ(FPREG(rlSrc.lowReg), FPREG(rlSrc.highReg));
DCHECK(rlDest.wide);
DCHECK(rlSrc.wide);
if (rlSrc.location == kLocPhysReg) {
if (oatIsLive(cUnit, rlSrc.lowReg) ||
oatIsLive(cUnit, rlSrc.highReg) ||
oatIsPromoted(cUnit, rlSrc.lowReg) ||
oatIsPromoted(cUnit, rlSrc.highReg) ||
(rlDest.location == kLocPhysReg)) {
// Src is live or promoted or Dest has assigned reg.
rlDest = oatEvalLoc(cUnit, rlDest, kAnyReg, false);
opRegCopyWide(cUnit, rlDest.lowReg, rlDest.highReg,
rlSrc.lowReg, rlSrc.highReg);
} else {
// Just re-assign the registers. Dest gets Src's regs
rlDest.lowReg = rlSrc.lowReg;
rlDest.highReg = rlSrc.highReg;
oatClobber(cUnit, rlSrc.lowReg);
oatClobber(cUnit, rlSrc.highReg);
}
} else {
// Load Src either into promoted Dest or temps allocated for Dest
rlDest = oatEvalLoc(cUnit, rlDest, kAnyReg, false);
loadValueDirectWide(cUnit, rlSrc, rlDest.lowReg, rlDest.highReg);
}
// Dest is now live and dirty (until/if we flush it to home location)
oatMarkLive(cUnit, rlDest.lowReg, rlDest.sRegLow);
oatMarkLive(cUnit, rlDest.highReg, oatSRegHi(rlDest.sRegLow));
oatMarkDirty(cUnit, rlDest);
oatMarkPair(cUnit, rlDest.lowReg, rlDest.highReg);
oatResetDefLocWide(cUnit, rlDest);
if ((oatIsDirty(cUnit, rlDest.lowReg) ||
oatIsDirty(cUnit, rlDest.highReg)) &&
(oatLiveOut(cUnit, rlDest.sRegLow) ||
oatLiveOut(cUnit, oatSRegHi(rlDest.sRegLow)))) {
defStart = (LIR*)cUnit->lastLIRInsn;
DCHECK_EQ((SRegToVReg(cUnit, rlDest.sRegLow)+1),
SRegToVReg(cUnit, oatSRegHi(rlDest.sRegLow)));
storeBaseDispWide(cUnit, rSP, oatSRegOffset(cUnit, rlDest.sRegLow),
rlDest.lowReg, rlDest.highReg);
oatMarkClean(cUnit, rlDest);
defEnd = (LIR*)cUnit->lastLIRInsn;
oatMarkDefWide(cUnit, rlDest, defStart, defEnd);
}
}
/*
* Mark garbage collection card. Skip if the value we're storing is null.
*/
void markGCCard(CompilationUnit* cUnit, int valReg, int tgtAddrReg)
{
int regCardBase = oatAllocTemp(cUnit);
int regCardNo = oatAllocTemp(cUnit);
LIR* branchOver = opCmpImmBranch(cUnit, kCondEq, valReg, 0, NULL);
#if !defined(TARGET_X86)
loadWordDisp(cUnit, rSELF, Thread::CardTableOffset().Int32Value(),
regCardBase);
#else
newLIR2(cUnit, kX86Mov32RT, regCardBase,
Thread::CardTableOffset().Int32Value());
#endif
opRegRegImm(cUnit, kOpLsr, regCardNo, tgtAddrReg, GC_CARD_SHIFT);
storeBaseIndexed(cUnit, regCardBase, regCardNo, regCardBase, 0,
kUnsignedByte);
LIR* target = newLIR0(cUnit, kPseudoTargetLabel);
branchOver->target = (LIR*)target;
oatFreeTemp(cUnit, regCardBase);
oatFreeTemp(cUnit, regCardNo);
}
/* Utilities to load the current Method* */
void loadCurrMethodDirect(CompilationUnit *cUnit, int rTgt)
{
loadValueDirectFixed(cUnit, cUnit->methodLoc, rTgt);
}
RegLocation loadCurrMethod(CompilationUnit *cUnit)
{
return loadValue(cUnit, cUnit->methodLoc, kCoreReg);
}
bool methodStarInReg(CompilationUnit* cUnit)
{
return (cUnit->methodLoc.location == kLocPhysReg);
}
} // namespace art
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