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Unified Diff: src/lithium.cc

Issue 6324003: Move class LGapResolver to the platform specific backend implementation files. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 9 years, 11 months ago
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Index: src/lithium.cc
diff --git a/src/lithium.cc b/src/lithium.cc
index 3fc761bad9d3c2d03e4439085d7daa8053cc1a70..e066e7da93fe0daa3247fefb2ea444046fae13c8 100644
--- a/src/lithium.cc
+++ b/src/lithium.cc
@@ -30,158 +30,6 @@
namespace v8 {
namespace internal {
-
-class LGapNode: public ZoneObject {
- public:
- explicit LGapNode(LOperand* operand)
- : operand_(operand), resolved_(false), visited_id_(-1) { }
-
- LOperand* operand() const { return operand_; }
- bool IsResolved() const { return !IsAssigned() || resolved_; }
- void MarkResolved() {
- ASSERT(!IsResolved());
- resolved_ = true;
- }
- int visited_id() const { return visited_id_; }
- void set_visited_id(int id) {
- ASSERT(id > visited_id_);
- visited_id_ = id;
- }
-
- bool IsAssigned() const { return assigned_from_.is_set(); }
- LGapNode* assigned_from() const { return assigned_from_.get(); }
- void set_assigned_from(LGapNode* n) { assigned_from_.set(n); }
-
- private:
- LOperand* operand_;
- SetOncePointer<LGapNode> assigned_from_;
- bool resolved_;
- int visited_id_;
-};
-
-
-LGapResolver::LGapResolver()
- : nodes_(32),
- identified_cycles_(4),
- result_(16),
- next_visited_id_(0) {
-}
-
-
-const ZoneList<LMoveOperands>* LGapResolver::Resolve(
- const ZoneList<LMoveOperands>* moves,
- LOperand* marker_operand) {
- nodes_.Rewind(0);
- identified_cycles_.Rewind(0);
- result_.Rewind(0);
- next_visited_id_ = 0;
-
- for (int i = 0; i < moves->length(); ++i) {
- LMoveOperands move = moves->at(i);
- if (!move.IsRedundant()) RegisterMove(move);
- }
-
- for (int i = 0; i < identified_cycles_.length(); ++i) {
- ResolveCycle(identified_cycles_[i], marker_operand);
- }
-
- int unresolved_nodes;
- do {
- unresolved_nodes = 0;
- for (int j = 0; j < nodes_.length(); j++) {
- LGapNode* node = nodes_[j];
- if (!node->IsResolved() && node->assigned_from()->IsResolved()) {
- AddResultMove(node->assigned_from(), node);
- node->MarkResolved();
- }
- if (!node->IsResolved()) ++unresolved_nodes;
- }
- } while (unresolved_nodes > 0);
- return &result_;
-}
-
-
-void LGapResolver::AddResultMove(LGapNode* from, LGapNode* to) {
- AddResultMove(from->operand(), to->operand());
-}
-
-
-void LGapResolver::AddResultMove(LOperand* from, LOperand* to) {
- result_.Add(LMoveOperands(from, to));
-}
-
-
-void LGapResolver::ResolveCycle(LGapNode* start, LOperand* marker_operand) {
- ZoneList<LOperand*> cycle_operands(8);
- cycle_operands.Add(marker_operand);
- LGapNode* cur = start;
- do {
- cur->MarkResolved();
- cycle_operands.Add(cur->operand());
- cur = cur->assigned_from();
- } while (cur != start);
- cycle_operands.Add(marker_operand);
-
- for (int i = cycle_operands.length() - 1; i > 0; --i) {
- LOperand* from = cycle_operands[i];
- LOperand* to = cycle_operands[i - 1];
- AddResultMove(from, to);
- }
-}
-
-
-bool LGapResolver::CanReach(LGapNode* a, LGapNode* b, int visited_id) {
- ASSERT(a != b);
- LGapNode* cur = a;
- while (cur != b && cur->visited_id() != visited_id && cur->IsAssigned()) {
- cur->set_visited_id(visited_id);
- cur = cur->assigned_from();
- }
-
- return cur == b;
-}
-
-
-bool LGapResolver::CanReach(LGapNode* a, LGapNode* b) {
- ASSERT(a != b);
- return CanReach(a, b, next_visited_id_++);
-}
-
-
-void LGapResolver::RegisterMove(LMoveOperands move) {
- if (move.from()->IsConstantOperand()) {
- // Constant moves should be last in the machine code. Therefore add them
- // first to the result set.
- AddResultMove(move.from(), move.to());
- } else {
- LGapNode* from = LookupNode(move.from());
- LGapNode* to = LookupNode(move.to());
- if (to->IsAssigned() && to->assigned_from() == from) {
- move.Eliminate();
- return;
- }
- ASSERT(!to->IsAssigned());
- if (CanReach(from, to)) {
- // This introduces a cycle. Save.
- identified_cycles_.Add(from);
- }
- to->set_assigned_from(from);
- }
-}
-
-
-LGapNode* LGapResolver::LookupNode(LOperand* operand) {
- for (int i = 0; i < nodes_.length(); ++i) {
- if (nodes_[i]->operand()->Equals(operand)) return nodes_[i];
- }
-
- // No node found => create a new one.
- LGapNode* result = new LGapNode(operand);
- nodes_.Add(result);
- return result;
-}
-
-
bool LParallelMove::IsRedundant() const {
for (int i = 0; i < move_operands_.length(); ++i) {
if (!move_operands_[i].IsRedundant()) return false;
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