DFGVariableEventStream.cpp [plain text]
#include "config.h"
#include "DFGVariableEventStream.h"
#if ENABLE(DFG_JIT)
#include "CodeBlock.h"
#include "DFGValueSource.h"
#include "Operations.h"
#include <wtf/DataLog.h>
#include <wtf/HashMap.h>
namespace JSC { namespace DFG {
void VariableEventStream::logEvent(const VariableEvent& event)
{
dataLogF("seq#%u:", static_cast<unsigned>(size()));
event.dump(WTF::dataFile());
dataLogF(" ");
}
namespace {
struct MinifiedGenerationInfo {
bool filled; VariableRepresentation u;
DataFormat format;
MinifiedGenerationInfo()
: format(DataFormatNone)
{
}
void update(const VariableEvent& event)
{
switch (event.kind()) {
case BirthToFill:
case Fill:
filled = true;
break;
case BirthToSpill:
case Spill:
filled = false;
break;
case Death:
format = DataFormatNone;
return;
default:
return;
}
u = event.variableRepresentation();
format = event.dataFormat();
}
};
}
bool VariableEventStream::tryToSetConstantRecovery(ValueRecovery& recovery, CodeBlock* codeBlock, MinifiedNode* node) const
{
if (!node)
return false;
if (node->hasConstantNumber()) {
recovery = ValueRecovery::constant(
codeBlock->constantRegister(
FirstConstantRegisterIndex + node->constantNumber()).get());
return true;
}
if (node->hasWeakConstant()) {
recovery = ValueRecovery::constant(node->weakConstant());
return true;
}
if (node->op() == PhantomArguments) {
recovery = ValueRecovery::argumentsThatWereNotCreated();
return true;
}
return false;
}
void VariableEventStream::reconstruct(
CodeBlock* codeBlock, CodeOrigin codeOrigin, MinifiedGraph& graph,
unsigned index, Operands<ValueRecovery>& valueRecoveries) const
{
ASSERT(codeBlock->getJITType() == JITCode::DFGJIT);
CodeBlock* baselineCodeBlock = codeBlock->baselineVersion();
unsigned numVariables;
if (codeOrigin.inlineCallFrame)
numVariables = baselineCodeBlockForInlineCallFrame(codeOrigin.inlineCallFrame)->m_numCalleeRegisters + codeOrigin.inlineCallFrame->stackOffset;
else
numVariables = baselineCodeBlock->m_numCalleeRegisters;
if (!index) {
valueRecoveries = Operands<ValueRecovery>(codeBlock->numParameters(), numVariables);
for (size_t i = 0; i < valueRecoveries.size(); ++i)
valueRecoveries[i] = ValueRecovery::alreadyInJSStack();
return;
}
unsigned startIndex = index - 1;
while (at(startIndex).kind() != Reset)
startIndex--;
#if DFG_ENABLE(DEBUG_VERBOSE)
dataLogF("Computing OSR exit recoveries starting at seq#%u.\n", startIndex);
#endif
Operands<ValueSource> operandSources(codeBlock->numParameters(), numVariables);
HashMap<MinifiedID, MinifiedGenerationInfo> generationInfos;
for (unsigned i = startIndex; i < index; ++i) {
const VariableEvent& event = at(i);
switch (event.kind()) {
case Reset:
break;
case BirthToFill:
case BirthToSpill: {
MinifiedGenerationInfo info;
info.update(event);
generationInfos.add(event.id(), info);
break;
}
case Fill:
case Spill:
case Death: {
HashMap<MinifiedID, MinifiedGenerationInfo>::iterator iter = generationInfos.find(event.id());
ASSERT(iter != generationInfos.end());
iter->value.update(event);
break;
}
case MovHintEvent:
if (operandSources.hasOperand(event.operand()))
operandSources.setOperand(event.operand(), ValueSource(event.id()));
break;
case SetLocalEvent:
if (operandSources.hasOperand(event.operand()))
operandSources.setOperand(event.operand(), ValueSource::forDataFormat(event.dataFormat()));
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
}
valueRecoveries = Operands<ValueRecovery>(codeBlock->numParameters(), numVariables);
for (unsigned i = 0; i < operandSources.size(); ++i) {
ValueSource& source = operandSources[i];
if (source.isTriviallyRecoverable()) {
valueRecoveries[i] = source.valueRecovery();
continue;
}
ASSERT(source.kind() == HaveNode);
MinifiedNode* node = graph.at(source.id());
if (tryToSetConstantRecovery(valueRecoveries[i], codeBlock, node))
continue;
MinifiedGenerationInfo info = generationInfos.get(source.id());
if (info.format == DataFormatNone) {
bool found = false;
if (node && node->op() == UInt32ToNumber) {
MinifiedID id = node->child1();
if (tryToSetConstantRecovery(valueRecoveries[i], codeBlock, graph.at(id)))
continue;
info = generationInfos.get(id);
if (info.format != DataFormatNone)
found = true;
}
if (!found) {
MinifiedID int32ToDoubleID;
MinifiedID valueToInt32ID;
MinifiedID uint32ToNumberID;
MinifiedID doubleAsInt32ID;
HashMap<MinifiedID, MinifiedGenerationInfo>::iterator iter = generationInfos.begin();
HashMap<MinifiedID, MinifiedGenerationInfo>::iterator end = generationInfos.end();
for (; iter != end; ++iter) {
MinifiedID id = iter->key;
node = graph.at(id);
if (!node)
continue;
if (!node->hasChild1())
continue;
if (node->child1() != source.id())
continue;
if (iter->value.format == DataFormatNone)
continue;
switch (node->op()) {
case Int32ToDouble:
case ForwardInt32ToDouble:
int32ToDoubleID = id;
break;
case ValueToInt32:
valueToInt32ID = id;
break;
case UInt32ToNumber:
uint32ToNumberID = id;
break;
case DoubleAsInt32:
doubleAsInt32ID = id;
break;
default:
break;
}
}
MinifiedID idToUse;
if (!!doubleAsInt32ID)
idToUse = doubleAsInt32ID;
else if (!!int32ToDoubleID)
idToUse = int32ToDoubleID;
else if (!!valueToInt32ID)
idToUse = valueToInt32ID;
else if (!!uint32ToNumberID)
idToUse = uint32ToNumberID;
if (!!idToUse) {
info = generationInfos.get(idToUse);
ASSERT(info.format != DataFormatNone);
found = true;
}
}
if (!found) {
valueRecoveries[i] = ValueRecovery::constant(jsUndefined());
continue;
}
}
ASSERT(info.format != DataFormatNone);
if (info.filled) {
if (info.format == DataFormatDouble) {
valueRecoveries[i] = ValueRecovery::inFPR(info.u.fpr);
continue;
}
#if USE(JSVALUE32_64)
if (info.format & DataFormatJS) {
valueRecoveries[i] = ValueRecovery::inPair(info.u.pair.tagGPR, info.u.pair.payloadGPR);
continue;
}
#endif
valueRecoveries[i] = ValueRecovery::inGPR(info.u.gpr, info.format);
continue;
}
valueRecoveries[i] =
ValueRecovery::displacedInJSStack(static_cast<VirtualRegister>(info.u.virtualReg), info.format);
}
for (InlineCallFrame* inlineCallFrame = codeOrigin.inlineCallFrame; inlineCallFrame; inlineCallFrame = inlineCallFrame->caller.inlineCallFrame) {
for (unsigned i = JSStack::CallFrameHeaderSize; i--;)
valueRecoveries.setLocal(inlineCallFrame->stackOffset - i - 1, ValueRecovery::alreadyInJSStack());
}
}
} }
#endif // ENABLE(DFG_JIT)