1 files changed, 208 insertions, 0 deletions
diff --git a/js/src/jit/JitZone.h b/js/src/jit/JitZone.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * 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_JitZone_h
+#define jit_JitZone_h
+
+#include "mozilla/Assertions.h"
+#include "mozilla/HashFunctions.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/MemoryReporting.h"
+
+#include <stddef.h>
+#include <stdint.h>
+#include <utility>
+
+#include "gc/Barrier.h"
+#include "jit/ExecutableAllocator.h"
+#include "jit/ICStubSpace.h"
+#include "jit/Invalidation.h"
+#include "js/AllocPolicy.h"
+#include "js/GCHashTable.h"
+#include "js/HashTable.h"
+#include "js/TracingAPI.h"
+#include "js/TypeDecls.h"
+#include "js/UniquePtr.h"
+#include "js/Utility.h"
+#include "threading/ProtectedData.h"
+
+namespace JS {
+struct CodeSizes;
+}
+
+namespace js {
+namespace jit {
+
+enum class CacheKind : uint8_t;
+class CacheIRStubInfo;
+class JitCode;
+
+enum class ICStubEngine : uint8_t {
+  // Baseline IC, see BaselineIC.h.
+  Baseline = 0,
+
+  // Ion IC, see IonIC.h.
+  IonIC
+};
+
+struct CacheIRStubKey : public DefaultHasher<CacheIRStubKey> {
+  struct Lookup {
+    CacheKind kind;
+    ICStubEngine engine;
+    const uint8_t* code;
+    uint32_t length;
+
+    Lookup(CacheKind kind, ICStubEngine engine, const uint8_t* code,
+           uint32_t length)
+        : kind(kind), engine(engine), code(code), length(length) {}
+  };
+
+  static HashNumber hash(const Lookup& l);
+  static bool match(const CacheIRStubKey& entry, const Lookup& l);
+
+  UniquePtr<CacheIRStubInfo, JS::FreePolicy> stubInfo;
+
+  explicit CacheIRStubKey(CacheIRStubInfo* info) : stubInfo(info) {}
+  CacheIRStubKey(CacheIRStubKey&& other)
+      : stubInfo(std::move(other.stubInfo)) {}
+
+  void operator=(CacheIRStubKey&& other) {
+    stubInfo = std::move(other.stubInfo);
+  }
+};
+
+struct BaselineCacheIRStubCodeMapGCPolicy {
+  static bool traceWeak(JSTracer* trc, CacheIRStubKey*,
+                        WeakHeapPtr<JitCode*>* value) {
+    return TraceWeakEdge(trc, value, "traceWeak");
+  }
+};
+
+class JitZone {
+  // Allocated space for optimized baseline stubs.
+  OptimizedICStubSpace optimizedStubSpace_;
+
+  // Set of CacheIRStubInfo instances used by Ion stubs in this Zone.
+  using IonCacheIRStubInfoSet =
+      HashSet<CacheIRStubKey, CacheIRStubKey, SystemAllocPolicy>;
+  IonCacheIRStubInfoSet ionCacheIRStubInfoSet_;
+
+  // Map CacheIRStubKey to shared JitCode objects.
+  using BaselineCacheIRStubCodeMap =
+      GCHashMap<CacheIRStubKey, WeakHeapPtr<JitCode*>, CacheIRStubKey,
+                SystemAllocPolicy, BaselineCacheIRStubCodeMapGCPolicy>;
+  BaselineCacheIRStubCodeMap baselineCacheIRStubCodes_;
+
+  // Executable allocator for all code except wasm code.
+  MainThreadData<ExecutableAllocator> execAlloc_;
+
+  // HashMap that maps scripts to compilations inlining those scripts.
+  using InlinedScriptMap =
+      GCHashMap<WeakHeapPtr<BaseScript*>, RecompileInfoVector,
+                StableCellHasher<WeakHeapPtr<BaseScript*>>, SystemAllocPolicy>;
+  InlinedScriptMap inlinedCompilations_;
+
+  // The following two fields are a pair of associated scripts. If they are
+  // non-null, the child has been inlined into the parent, and we have bailed
+  // out due to a MonomorphicInlinedStubFolding bailout. If it wasn't
+  // trial-inlined, we need to track for the parent if we attach a new case to
+  // the corresponding folded stub which belongs to the child.
+  WeakHeapPtr<JSScript*> lastStubFoldingBailoutChild_;
+  WeakHeapPtr<JSScript*> lastStubFoldingBailoutParent_;
+
+  mozilla::Maybe<IonCompilationId> currentCompilationId_;
+  bool keepJitScripts_ = false;
+
+ public:
+  ~JitZone() { MOZ_ASSERT(!keepJitScripts_); }
+
+  void traceWeak(JSTracer* trc);
+
+  void addSizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf,
+                              JS::CodeSizes* code, size_t* jitZone,
+                              size_t* baselineStubsOptimized) const;
+
+  OptimizedICStubSpace* optimizedStubSpace() { return &optimizedStubSpace_; }
+
+  JitCode* getBaselineCacheIRStubCode(const CacheIRStubKey::Lookup& key,
+                                      CacheIRStubInfo** stubInfo) {
+    auto p = baselineCacheIRStubCodes_.lookup(key);
+    if (p) {
+      *stubInfo = p->key().stubInfo.get();
+      return p->value();
+    }
+    *stubInfo = nullptr;
+    return nullptr;
+  }
+  [[nodiscard]] bool putBaselineCacheIRStubCode(
+      const CacheIRStubKey::Lookup& lookup, CacheIRStubKey& key,
+      JitCode* stubCode) {
+    auto p = baselineCacheIRStubCodes_.lookupForAdd(lookup);
+    MOZ_ASSERT(!p);
+    return baselineCacheIRStubCodes_.add(p, std::move(key), stubCode);
+  }
+
+  CacheIRStubInfo* getIonCacheIRStubInfo(const CacheIRStubKey::Lookup& key) {
+    IonCacheIRStubInfoSet::Ptr p = ionCacheIRStubInfoSet_.lookup(key);
+    return p ? p->stubInfo.get() : nullptr;
+  }
+  [[nodiscard]] bool putIonCacheIRStubInfo(const CacheIRStubKey::Lookup& lookup,
+                                           CacheIRStubKey& key) {
+    IonCacheIRStubInfoSet::AddPtr p =
+        ionCacheIRStubInfoSet_.lookupForAdd(lookup);
+    MOZ_ASSERT(!p);
+    return ionCacheIRStubInfoSet_.add(p, std::move(key));
+  }
+  void purgeIonCacheIRStubInfo() { ionCacheIRStubInfoSet_.clearAndCompact(); }
+
+  ExecutableAllocator& execAlloc() { return execAlloc_.ref(); }
+  const ExecutableAllocator& execAlloc() const { return execAlloc_.ref(); }
+
+  [[nodiscard]] bool addInlinedCompilation(const RecompileInfo& info,
+                                           JSScript* inlined);
+
+  RecompileInfoVector* maybeInlinedCompilations(JSScript* inlined) {
+    auto p = inlinedCompilations_.lookup(inlined);
+    return p ? &p->value() : nullptr;
+  }
+
+  void removeInlinedCompilations(JSScript* inlined) {
+    inlinedCompilations_.remove(inlined);
+  }
+
+  void noteStubFoldingBailout(JSScript* child, JSScript* parent) {
+    lastStubFoldingBailoutChild_ = child;
+    lastStubFoldingBailoutParent_ = parent;
+  }
+  bool hasStubFoldingBailoutData(JSScript* child) const {
+    return lastStubFoldingBailoutChild_ &&
+           lastStubFoldingBailoutChild_.get() == child &&
+           lastStubFoldingBailoutParent_;
+  }
+  JSScript* stubFoldingBailoutParent() const {
+    MOZ_ASSERT(lastStubFoldingBailoutChild_);
+    return lastStubFoldingBailoutParent_.get();
+  }
+  void clearStubFoldingBailoutData() {
+    lastStubFoldingBailoutChild_ = nullptr;
+    lastStubFoldingBailoutParent_ = nullptr;
+  }
+
+  bool keepJitScripts() const { return keepJitScripts_; }
+  void setKeepJitScripts(bool keep) { keepJitScripts_ = keep; }
+
+  mozilla::Maybe<IonCompilationId> currentCompilationId() const {
+    return currentCompilationId_;
+  }
+  mozilla::Maybe<IonCompilationId>& currentCompilationIdRef() {
+    return currentCompilationId_;
+  }
+};
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_JitZone_h */