Revert of [profiler] Implement POC Sampling Heap Profiler

include/v8-profiler.h

Index: include/v8-profiler.h
diff --git a/include/v8-profiler.h b/include/v8-profiler.h
index a991aa059d18b4d70e35e1e3da8b46183598c86b..e432600290c6bb3e6749e7836b916eb5e0315e17 100644
--- a/include/v8-profiler.h
+++ b/include/v8-profiler.h
@@ -419,90 +419,6 @@
 
 
 /**
- * AllocationProfile is a sampled profile of allocations done by the program.
- * This is structured as a call-graph.
- */
-class V8_EXPORT AllocationProfile {
- public:
-  struct Allocation {
-    /**
-     * Size of the sampled allocation object.
-     */
-    size_t size;
-
-    /**
-     * The number of objects of such size that were sampled.
-     */
-    unsigned int count;
-  };
-
-  /**
-   * Represents a node in the call-graph.
-   */
-  struct Node {
-    /**
-     * Name of the function. May be empty for anonymous functions or if the
-     * script corresponding to this function has been unloaded.
-     */
-    Local<String> name;
-
-    /**
-     * Name of the script containing the function. May be empty if the script
-     * name is not available, or if the script has been unloaded.
-     */
-    Local<String> script_name;
-
-    /**
-     * id of the script where the function is located. May be equal to
-     * v8::UnboundScript::kNoScriptId in cases where the script doesn't exist.
-     */
-    int script_id;
-
-    /**
-     * Start position of the function in the script.
-     */
-    int start_position;
-
-    /**
-     * 1-indexed line number where the function starts. May be
-     * kNoLineNumberInfo if no line number information is available.
-     */
-    int line_number;
-
-    /**
-     * 1-indexed column number where the function starts. May be
-     * kNoColumnNumberInfo if no line number information is available.
-     */
-    int column_number;
-
-    /**
-     * List of callees called from this node for which we have sampled
-     * allocations. The lifetime of the children is scoped to the containing
-     * AllocationProfile.
-     */
-    std::vector<Node*> children;
-
-    /**
-     * List of self allocations done by this node in the call-graph.
-     */
-    std::vector<Allocation> allocations;
-  };
-
-  /**
-   * Returns the root node of the call-graph. The root node corresponds to an
-   * empty JS call-stack. The lifetime of the returned Node* is scoped to the
-   * containing AllocationProfile.
-   */
-  virtual Node* GetRootNode() = 0;
-
-  virtual ~AllocationProfile() {}
-
-  static const int kNoLineNumberInfo = Message::kNoLineNumberInfo;
-  static const int kNoColumnNumberInfo = Message::kNoColumnInfo;
-};
-
-
-/**
  * Interface for controlling heap profiling. Instance of the
  * profiler can be retrieved using v8::Isolate::GetHeapProfiler.
  */
@@ -604,49 +520,6 @@
    * calling GetHeapStats next time.
    */
   void StopTrackingHeapObjects();
-
-  /**
-   * Starts gathering a sampling heap profile. A sampling heap profile is
-   * similar to tcmalloc's heap profiler and Go's mprof. It samples object
-   * allocations and builds an online 'sampling' heap profile. At any point in
-   * time, this profile is expected to be a representative sample of objects
-   * currently live in the system. Each sampled allocation includes the stack
-   * trace at the time of allocation, which makes this really useful for memory
-   * leak detection.
-   *
-   * This mechanism is intended to be cheap enough that it can be used in
-   * production with minimal performance overhead.
-   *
-   * Allocations are sampled using a randomized Poisson process. On average, one
-   * allocation will be sampled every |sample_interval| bytes allocated. The
-   * |stack_depth| parameter controls the maximum number of stack frames to be
-   * captured on each allocation.
-   *
-   * NOTE: This is a proof-of-concept at this point. Right now we only sample
-   * newspace allocations. Support for paged space allocation (e.g. pre-tenured
-   * objects, large objects, code objects, etc.) and native allocations
-   * doesn't exist yet, but is anticipated in the future.
-   *
-   * Objects allocated before the sampling is started will not be included in
-   * the profile.
-   *
-   * Returns false if a sampling heap profiler is already running.
-   */
-  bool StartSamplingHeapProfiler(uint64_t sample_interval = 512 * 1024,
-                                 int stack_depth = 16);
-
-  /**
-   * Stops the sampling heap profile and discards the current profile.
-   */
-  void StopSamplingHeapProfiler();
-
-  /**
-   * Returns the sampled profile of allocations allocated (and still live) since
-   * StartSamplingHeapProfiler was called. The ownership of the pointer is
-   * transfered to the caller. Returns nullptr if sampling heap profiler is not
-   * active.
-   */
-  AllocationProfile* GetAllocationProfile();
 
   /**
    * Deletes all snapshots taken. All previously returned pointers to