DFGInvalidationPointInjectionPhase.cpp [plain text]
#include "config.h"
#include "DFGInvalidationPointInjectionPhase.h"
#if ENABLE(DFG_JIT)
#include "DFGBlockSetInlines.h"
#include "DFGClobberize.h"
#include "DFGGraph.h"
#include "DFGInsertionSet.h"
#include "DFGPhase.h"
#include "JSCInlines.h"
namespace JSC { namespace DFG {
class InvalidationPointInjectionPhase : public Phase {
static const bool verbose = false;
public:
InvalidationPointInjectionPhase(Graph& graph)
: Phase(graph, "invalidation point injection")
, m_insertionSet(graph)
{
}
bool run()
{
ASSERT(m_graph.m_form != SSA);
BlockSet blocksThatNeedInvalidationPoints;
for (BlockIndex blockIndex = m_graph.numBlocks(); blockIndex--;) {
BasicBlock* block = m_graph.block(blockIndex);
if (!block)
continue;
m_originThatHadFire = CodeOrigin();
for (unsigned nodeIndex = 0; nodeIndex < block->size(); ++nodeIndex)
handle(nodeIndex, block->at(nodeIndex));
if (m_originThatHadFire.isSet()) {
for (unsigned i = block->numSuccessors(); i--;)
blocksThatNeedInvalidationPoints.add(block->successor(i));
}
m_insertionSet.execute(block);
}
for (BasicBlock* block : blocksThatNeedInvalidationPoints.iterable(m_graph)) {
insertInvalidationCheck(0, block->at(0));
m_insertionSet.execute(block);
}
return true;
}
private:
void handle(unsigned nodeIndex, Node* node)
{
if (m_originThatHadFire.isSet() && m_originThatHadFire != node->origin.forExit) {
insertInvalidationCheck(nodeIndex, node);
m_originThatHadFire = CodeOrigin();
}
if (writesOverlap(m_graph, node, Watchpoint_fire))
m_originThatHadFire = node->origin.forExit;
}
void insertInvalidationCheck(unsigned nodeIndex, Node* node)
{
m_insertionSet.insertNode(nodeIndex, SpecNone, InvalidationPoint, node->origin);
}
CodeOrigin m_originThatHadFire;
InsertionSet m_insertionSet;
};
bool performInvalidationPointInjection(Graph& graph)
{
return runPhase<InvalidationPointInjectionPhase>(graph);
}
} }
#endif // ENABLE(DFG_JIT)