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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.
*/
#include "Dalvik.h"
#include "CompilerInternals.h"
#include "Dataflow.h"
#include "codegen/Ralloc.h"
STATIC bool setFp(CompilationUnit* cUnit, int index, bool isFP) {
bool change = false;
if (isFP && !cUnit->regLocation[index].fp) {
cUnit->regLocation[index].fp = true;
change = true;
}
return change;
}
STATIC bool remapNames(CompilationUnit* cUnit, BasicBlock* bb)
{
if (bb->blockType != kDalvikByteCode && bb->blockType != kEntryBlock &&
bb->blockType != kExitBlock)
return false;
for (MIR* mir = bb->firstMIRInsn; mir; mir = mir->next) {
SSARepresentation *ssaRep = mir->ssaRep;
if (ssaRep) {
for (int i = 0; i < ssaRep->numUses; i++) {
ssaRep->uses[i] = cUnit->phiAliasMap[ssaRep->uses[i]];
}
for (int i = 0; i < ssaRep->numDefs; i++) {
ssaRep->defs[i] = cUnit->phiAliasMap[ssaRep->defs[i]];
}
}
}
return false;
}
/*
* Infer types and sizes. We don't need to track change on sizes,
* as it doesn't propagate. We're guaranteed at least one pass through
* the cfg.
*/
STATIC bool inferTypeAndSize(CompilationUnit* cUnit, BasicBlock* bb)
{
MIR *mir;
bool changed = false; // Did anything change?
if (bb->dataFlowInfo == NULL) return false;
if (bb->blockType != kDalvikByteCode && bb->blockType != kEntryBlock)
return false;
for (mir = bb->firstMIRInsn; mir; mir = mir->next) {
SSARepresentation *ssaRep = mir->ssaRep;
if (ssaRep) {
int attrs = oatDataFlowAttributes[mir->dalvikInsn.opcode];
int next = 0;
if (attrs & DF_DA_WIDE) {
cUnit->regLocation[ssaRep->defs[0]].wide = true;
}
if (attrs & DF_UA_WIDE) {
cUnit->regLocation[ssaRep->uses[next]].wide = true;
next += 2;
}
if (attrs & DF_UB_WIDE) {
cUnit->regLocation[ssaRep->uses[next]].wide = true;
next += 2;
}
if (attrs & DF_UC_WIDE) {
cUnit->regLocation[ssaRep->uses[next]].wide = true;
next += 2;
}
// Special-case handling for format 35c/3rc invokes
Opcode opcode = mir->dalvikInsn.opcode;
int flags = (opcode >= kNumPackedOpcodes) ? 0 :
dexGetFlagsFromOpcode(opcode);
if ((flags & kInstrInvoke) &&
(attrs & (DF_FORMAT_35C | DF_FORMAT_3RC))) {
DCHECK_EQ(next, 0);
int target_idx = mir->dalvikInsn.vB;
const char* shorty =
oatGetShortyFromTargetIdx(cUnit, target_idx);
int numUses = mir->dalvikInsn.vA;
// If this is a non-static invoke, skip implicit "this"
if (((mir->dalvikInsn.opcode != OP_INVOKE_STATIC) &&
(mir->dalvikInsn.opcode != OP_INVOKE_STATIC_RANGE))) {
next++;
}
uint32_t cpos = 1;
if (strlen(shorty) > 1) {
for (int i = next; i < numUses;) {
DCHECK_LT(cpos, strlen(shorty));
switch(shorty[cpos++]) {
case 'D':
ssaRep->fpUse[i] = true;
ssaRep->fpUse[i+1] = true;
cUnit->regLocation[ssaRep->uses[i]].wide = true;
i++;
break;
case 'J':
cUnit->regLocation[ssaRep->uses[i]].wide = true;
i++;
break;
case 'F':
ssaRep->fpUse[i] = true;
break;
default:
break;
}
i++;
}
}
}
for (int i=0; ssaRep->fpUse && i< ssaRep->numUses; i++) {
if (ssaRep->fpUse[i])
changed |= setFp(cUnit, ssaRep->uses[i], true);
}
for (int i=0; ssaRep->fpDef && i< ssaRep->numDefs; i++) {
if (ssaRep->fpDef[i])
changed |= setFp(cUnit, ssaRep->defs[i], true);
}
// Special-case handling for moves & Phi
if (attrs & (DF_IS_MOVE | DF_NULL_TRANSFER_N)) {
bool isFP = cUnit->regLocation[ssaRep->defs[0]].fp;
for (int i = 0; i < ssaRep->numUses; i++) {
isFP |= cUnit->regLocation[ssaRep->uses[i]].fp;
}
changed |= setFp(cUnit, ssaRep->defs[0], isFP);
for (int i = 0; i < ssaRep->numUses; i++) {
changed |= setFp(cUnit, ssaRep->uses[i], isFP);
}
}
}
}
return changed;
}
static const char* storageName[] = {" Frame ", "PhysReg", " Spill "};
void oatDumpRegLocTable(RegLocation* table, int count)
{
for (int i = 0; i < count; i++) {
char buf[100];
snprintf(buf, 100, "Loc[%02d] : %s, %c %c r%d r%d S%d : %s s%d s%d",
i, storageName[table[i].location], table[i].wide ? 'W' : 'N',
table[i].fp ? 'F' : 'C', table[i].lowReg, table[i].highReg,
table[i].sRegLow, storageName[table[i].fpLocation],
table[i].fpLowReg & FP_REG_MASK, table[i].fpHighReg &
FP_REG_MASK);
LOG(INFO) << buf;
}
}
static const RegLocation freshLoc = {kLocDalvikFrame, 0, 0, INVALID_REG,
INVALID_REG, INVALID_SREG, 0,
kLocDalvikFrame, INVALID_REG, INVALID_REG,
INVALID_OFFSET};
/*
* Simple register allocation. Some Dalvik virtual registers may
* be promoted to physical registers. Most of the work for temp
* allocation is done on the fly. We also do some initilization and
* type inference here.
*/
void oatSimpleRegAlloc(CompilationUnit* cUnit)
{
int i;
RegLocation* loc;
/* Allocate the location map */
loc = (RegLocation*)oatNew(cUnit->numSSARegs * sizeof(*loc), true);
for (i=0; i< cUnit->numSSARegs; i++) {
loc[i] = freshLoc;
loc[i].sRegLow = i;
}
cUnit->regLocation = loc;
/* Add types of incoming arguments based on signature */
int numRegs = cUnit->method->NumRegisters();
int numIns = cUnit->method->NumIns();
if (numIns > 0) {
int sReg = numRegs - numIns;
if (!cUnit->method->IsStatic()) {
// Skip past "this"
sReg++;
}
const String* shorty = cUnit->method->GetShorty();
for (int i = 1; i < shorty->GetLength(); i++) {
char arg = shorty->CharAt(i);
// Is it wide?
if ((arg == 'D') || (arg == 'J')) {
cUnit->regLocation[sReg].wide = true;
cUnit->regLocation[sReg+1].fp = cUnit->regLocation[sReg].fp;
sReg++; // Skip to next
}
sReg++;
}
}
/* Remap names */
oatDataFlowAnalysisDispatcher(cUnit, remapNames,
kPreOrderDFSTraversal,
false /* isIterative */);
/* Do type & size inference pass */
oatDataFlowAnalysisDispatcher(cUnit, inferTypeAndSize,
kPreOrderDFSTraversal,
true /* isIterative */);
/*
* Set the sRegLow field to refer to the pre-SSA name of the
* base Dalvik virtual register. Once we add a better register
* allocator, remove this remapping.
*/
for (i=0; i < cUnit->numSSARegs; i++) {
cUnit->regLocation[i].sRegLow =
DECODE_REG(oatConvertSSARegToDalvik(cUnit, loc[i].sRegLow));
}
cUnit->coreSpillMask = 0;
cUnit->fpSpillMask = 0;
cUnit->numCoreSpills = 0;
oatDoPromotion(cUnit);
if (cUnit->printMe && !(cUnit->disableOpt & (1 << kPromoteRegs))) {
LOG(INFO) << "After Promotion";
oatDumpRegLocTable(cUnit->regLocation, cUnit->numSSARegs);
}
/* Figure out the frame size */
cUnit->numIns = cUnit->method->NumIns();
cUnit->numRegs = cUnit->method->NumRegisters() - cUnit->numIns;
cUnit->numOuts = cUnit->method->NumOuts();
cUnit->numPadding = (STACK_ALIGN_WORDS -
(cUnit->numCoreSpills + cUnit->numFPSpills + cUnit->numRegs +
cUnit->numOuts + 2)) & (STACK_ALIGN_WORDS-1);
cUnit->frameSize = (cUnit->numCoreSpills + cUnit->numFPSpills +
cUnit->numRegs + cUnit->numOuts +
cUnit->numPadding + 2) * 4;
cUnit->insOffset = cUnit->frameSize + 4;
cUnit->regsOffset = (cUnit->numOuts + cUnit->numPadding + 1) * 4;
/* Compute sp-relative home location offsets */
for (i = 0; i < cUnit->numSSARegs; i++) {
int vReg = oatS2VReg(cUnit, cUnit->regLocation[i].sRegLow);
cUnit->regLocation[i].spOffset = oatVRegOffset(cUnit, vReg);
}
}
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