Fix compilation under MSVC VS2015 (#6081)

Summary:
**NOTE**: this also needs to be back-ported to 6.4.6 and possibly older branches if further releases from them is envisaged.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6081

Differential Revision: D18710107

Pulled By: zhichao-cao

fbshipit-source-id: 03260f9316566e2bfc12c7d702d6338bb7941e01

tools/block_cache_analyzer/block_cache_trace_analyzer.cc

@@ -14,6 +14,7 @@
 #include <fstream>
 #include <iomanip>
 #include <iostream>
+#include <memory>
 #include <random>
 #include <sstream>
 
@@ -650,7 +651,7 @@ void BlockCacheTraceAnalyzer::WriteCorrelationFeaturesToFile(
     const std::map<std::string, Features>& label_features,
     const std::map<std::string, Predictions>& label_predictions,
     uint32_t max_number_of_values) const {
-  std::default_random_engine rand_engine(static_cast<unsigned int>(env_->NowMicros()));
+  std::default_random_engine rand_engine(static_cast<std::default_random_engine::result_type>(env_->NowMicros()));
   for (auto const& label_feature_vectors : label_features) {
     const Features& past = label_feature_vectors.second;
     auto it = label_predictions.find(label_feature_vectors.first);
@@ -1170,7 +1171,7 @@ void BlockCacheTraceAnalyzer::WriteReuseLifetime(
 }
 
 void BlockCacheTraceAnalyzer::WriteBlockReuseTimeline(
-    uint64_t reuse_window, bool user_access_only, TraceType block_type) const {
+    const uint64_t reuse_window, bool user_access_only, TraceType block_type) const {
   // A map from block key to an array of bools that states whether a block is
   // accessed in a time window.
   std::map<uint64_t, std::vector<bool>> block_accessed;
@@ -1209,11 +1210,11 @@ void BlockCacheTraceAnalyzer::WriteBlockReuseTimeline(
   TraverseBlocks(block_callback);
 
   // A cell is the number of blocks accessed in a reuse window.
-  uint64_t reuse_table[reuse_vector_size][reuse_vector_size];
+  std::unique_ptr<uint64_t[]> reuse_table(new uint64_t[reuse_vector_size * reuse_vector_size]);
   for (uint64_t start_time = 0; start_time < reuse_vector_size; start_time++) {
     // Initialize the reuse_table.
     for (uint64_t i = 0; i < reuse_vector_size; i++) {
-      reuse_table[start_time][i] = 0;
+      reuse_table[start_time * reuse_vector_size + i] = 0;
     }
     // Examine all blocks.
     for (auto const& block : block_accessed) {
@@ -1222,7 +1223,7 @@ void BlockCacheTraceAnalyzer::WriteBlockReuseTimeline(
           // This block is accessed at start time and at the current time. We
           // increment reuse_table[start_time][i] since it is reused at the ith
           // window.
-          reuse_table[start_time][i]++;
+          reuse_table[start_time * reuse_vector_size + i]++;
         }
       }
     }
@@ -1250,8 +1251,8 @@ void BlockCacheTraceAnalyzer::WriteBlockReuseTimeline(
       if (j < start_time) {
         row += "100.0";
       } else {
-        row += std::to_string(percent(reuse_table[start_time][j],
-                                      reuse_table[start_time][start_time]));
+        row += std::to_string(percent(reuse_table[start_time * reuse_vector_size + j],
+                                      reuse_table[start_time * reuse_vector_size + start_time]));
       }
     }
     out << row << std::endl;
@@ -1673,7 +1674,7 @@ void BlockCacheTraceAnalyzer::PrintAccessCountStats(bool user_access_only,
     if (bottom_k_index >= bottom_k) {
       break;
     }
-    std::map<TableReaderCaller, uint32_t> caller_naccesses;
+    std::map<TableReaderCaller, uint64_t> caller_naccesses;
     uint64_t naccesses = 0;
     for (auto const& block_id : naccess_it->second) {
       BlockAccessInfo* block = block_info_map_.find(block_id)->second;

tools/block_cache_analyzer/block_cache_trace_analyzer.h

@@ -289,7 +289,7 @@ class BlockCacheTraceAnalyzer {
   // The file is named
   // "block_type_user_access_only_reuse_window_reuse_timeline". The file format
   // is start_time,0,1,...,N where N equals trace_duration / reuse_window.
-  void WriteBlockReuseTimeline(uint64_t reuse_window, bool user_access_only,
+  void WriteBlockReuseTimeline(const uint64_t reuse_window, bool user_access_only,
                                TraceType block_type) const;
 
   // Write the Get spatical locality into csv files saved in 'output_dir'.

utilities/transactions/transaction_base.cc

@@ -323,7 +323,7 @@ void TransactionBaseImpl::MultiGet(const ReadOptions& read_options,
                                    ColumnFamilyHandle* column_family,
                                    const size_t num_keys, const Slice* keys,
                                    PinnableSlice* values, Status* statuses,
-                                   bool sorted_input) {
+                                   const bool sorted_input) {
   write_batch_.MultiGetFromBatchAndDB(db_, read_options, column_family,
                                       num_keys, keys, values, statuses,
                                       sorted_input);

utilities/transactions/transaction_base.h

@@ -98,7 +98,7 @@ class TransactionBaseImpl : public Transaction {
 
   void MultiGet(const ReadOptions& options, ColumnFamilyHandle* column_family,
                 const size_t num_keys, const Slice* keys, PinnableSlice* values,
-                Status* statuses, bool sorted_input = false) override;
+                Status* statuses, const bool sorted_input = false) override;
 
   using Transaction::MultiGetForUpdate;
   std::vector<Status> MultiGetForUpdate(

utilities/transactions/write_prepared_txn.cc

@@ -44,7 +44,7 @@ void WritePreparedTxn::MultiGet(const ReadOptions& options,
                                 ColumnFamilyHandle* column_family,
                                 const size_t num_keys, const Slice* keys,
                                 PinnableSlice* values, Status* statuses,
-                                bool sorted_input) {
+                                const bool sorted_input) {
   SequenceNumber min_uncommitted, snap_seq;
   const SnapshotBackup backed_by_snapshot =
       wpt_db_->AssignMinMaxSeqs(options.snapshot, &min_uncommitted, &snap_seq);

utilities/transactions/write_prepared_txn.h

@@ -61,7 +61,7 @@ class WritePreparedTxn : public PessimisticTransaction {
                         ColumnFamilyHandle* column_family,
                         const size_t num_keys, const Slice* keys,
                         PinnableSlice* values, Status* statuses,
-                        bool sorted_input = false) override;
+                        const bool sorted_input = false) override;
 
   // Note: The behavior is undefined in presence of interleaved writes to the
   // same transaction.

utilities/transactions/write_unprepared_txn.cc

@@ -837,7 +837,7 @@ void WriteUnpreparedTxn::MultiGet(const ReadOptions& options,
                                   ColumnFamilyHandle* column_family,
                                   const size_t num_keys, const Slice* keys,
                                   PinnableSlice* values, Status* statuses,
-                                  bool sorted_input) {
+                                  const bool sorted_input) {
   SequenceNumber min_uncommitted, snap_seq;
   const SnapshotBackup backed_by_snapshot =
       wupt_db_->AssignMinMaxSeqs(options.snapshot, &min_uncommitted, &snap_seq);

utilities/transactions/write_unprepared_txn.h

@@ -194,7 +194,7 @@ class WriteUnpreparedTxn : public WritePreparedTxn {
                         ColumnFamilyHandle* column_family,
                         const size_t num_keys, const Slice* keys,
                         PinnableSlice* values, Status* statuses,
-                        bool sorted_input = false) override;
+                        const bool sorted_input = false) override;
 
   using Transaction::GetIterator;
   virtual Iterator* GetIterator(const ReadOptions& options) override;