Add m-esr52 at 52.6.0

1 files changed, 71 insertions, 0 deletions

diff --git a/js/src/jit/FlowAliasAnalysis.h b/js/src/jit/FlowAliasAnalysis.h
new file mode 100644
index 000000000..d4c8c0f5f
--- /dev/null
+++ b/js/src/jit/FlowAliasAnalysis.h
@@ -0,0 +1,71 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef jit_FlowAliasAnalysis_h
+#define jit_FlowAliasAnalysis_h
+
+#include "jit/AliasAnalysisShared.h"
+#include "jit/MIR.h"
+#include "jit/MIRGraph.h"
+
+namespace js {
+namespace jit {
+
+class LoopInfo;
+class MIRGraph;
+class GraphStoreInfo;
+
+typedef MDefinitionVector BlockStoreInfo;
+typedef Vector<BlockStoreInfo*, 50, JitAllocPolicy> GraphStoreVector;
+
+class FlowAliasAnalysis : public AliasAnalysisShared
+{
+    // Info on the graph.
+    LoopInfo* loop_;
+    GraphStoreInfo* stores_;
+
+    // Helper vectors. In order to not have to recreate them the whole time.
+    MDefinitionVector output_;
+    MDefinitionVector worklist_;
+
+  public:
+    FlowAliasAnalysis(MIRGenerator* mir, MIRGraph& graph);
+    MOZ_MUST_USE bool analyze() override;
+
+  protected:
+    /* Process instructions. */
+    MOZ_MUST_USE bool processStore(BlockStoreInfo& stores, MDefinition* store);
+    MOZ_MUST_USE bool processLoad(BlockStoreInfo& stores, MDefinition* load);
+    MOZ_MUST_USE bool processDeferredLoads(LoopInfo* info);
+
+    /* Improve dependency and helpers. */
+    MOZ_MUST_USE bool improveDependency(MDefinition* load, MDefinitionVector& inputStores,
+                                        MDefinitionVector& outputStores);
+    MOZ_MUST_USE bool improveNonAliasedStores(MDefinition* load, MDefinitionVector& inputStores,
+                                              MDefinitionVector& outputStores, bool* improved,
+                                              bool onlyControlInstructions = false);
+    MOZ_MUST_USE bool improveStoresInFinishedLoops(MDefinition* load, MDefinitionVector& stores,
+                                                   bool* improved);
+
+    MOZ_MUST_USE bool improveLoopDependency(MDefinition* load, MDefinitionVector& inputStores,
+                                            MDefinitionVector& outputStores);
+    MOZ_MUST_USE bool deferImproveDependency(MDefinitionVector& stores);
+
+    /* Save dependency info. */
+    void saveLoadDependency(MDefinition* load, MDefinitionVector& dependencies);
+    MOZ_MUST_USE bool saveStoreDependency(MDefinition* store, BlockStoreInfo& prevStores);
+
+    /* Helper functions. */
+    MOZ_MUST_USE bool computeBlockStores(MBasicBlock* block);
+    MOZ_MUST_USE bool isLoopInvariant(MDefinition* load, MDefinition* store, bool* loopinvariant);
+    bool loopIsFinished(MBasicBlock* loopheader);
+
+};
+
+} // namespace jit
+} // namespace js
+
+#endif /* jit_FlowAliasAnalysis_h */