From 35ae2c0272f7d75ca01dbb4baee9071869ffc01e Mon Sep 17 00:00:00 2001
From: Oliver Reiche <oliver.reiche@huawei.com>
Date: Mon, 13 Jun 2022 13:30:13 +0200
Subject: ResultMap: Keep track of targets to cache

---
 src/buildtool/build_engine/target_map/TARGETS      |  3 ++-
 .../build_engine/target_map/result_map.hpp         | 29 +++++++++++++++++++---
 2 files changed, 28 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/buildtool/build_engine/target_map/TARGETS b/src/buildtool/build_engine/target_map/TARGETS
index a4704623..d3c6e815 100644
--- a/src/buildtool/build_engine/target_map/TARGETS
+++ b/src/buildtool/build_engine/target_map/TARGETS
@@ -15,7 +15,8 @@
   , "name": ["result_map"]
   , "hdrs": ["result_map.hpp"]
   , "deps":
-    [ ["src/buildtool/common", "tree"]
+    [ "target_cache"
+    , ["src/buildtool/common", "tree"]
     , ["src/buildtool/build_engine/analysed_target", "target"]
     , ["src/buildtool/build_engine/target_map", "configured_target"]
     , ["src/buildtool/build_engine/expression", "expression"]
diff --git a/src/buildtool/build_engine/target_map/result_map.hpp b/src/buildtool/build_engine/target_map/result_map.hpp
index 61d72bf2..173f59d9 100644
--- a/src/buildtool/build_engine/target_map/result_map.hpp
+++ b/src/buildtool/build_engine/target_map/result_map.hpp
@@ -14,6 +14,7 @@
 #include "src/buildtool/build_engine/base_maps/entity_name.hpp"
 #include "src/buildtool/build_engine/expression/expression.hpp"
 #include "src/buildtool/build_engine/target_map/configured_target.hpp"
+#include "src/buildtool/build_engine/target_map/target_cache.hpp"
 #include "src/buildtool/common/tree.hpp"
 #include "src/buildtool/logging/logger.hpp"
 #include "src/buildtool/multithreading/task.hpp"
@@ -55,13 +56,17 @@ class ResultTargetMap {
     // element of the map after insertion.
     [[nodiscard]] auto Add(BuildMaps::Base::EntityName name,
                            Configuration conf,
-                           gsl::not_null<AnalysedTargetPtr> result)
-        -> AnalysedTargetPtr {
+                           gsl::not_null<AnalysedTargetPtr> result,
+                           std::optional<TargetCache::Key> target_cache_key =
+                               std::nullopt) -> AnalysedTargetPtr {
         auto part = std::hash<BuildMaps::Base::EntityName>{}(name) % width_;
         std::unique_lock lock{m_[part]};
         auto [entry, inserted] = targets_[part].emplace(
             ConfiguredTarget{std::move(name), std::move(conf)},
             std::move(result));
+        if (target_cache_key) {
+            cache_targets_[part].emplace(*target_cache_key, entry->second);
+        }
         if (inserted) {
             num_actions_[part] += entry->second->Actions().size();
             num_blobs_[part] += entry->second->Blobs().size();
@@ -92,6 +97,18 @@ class ResultTargetMap {
         return targets;
     }
 
+    [[nodiscard]] auto CacheTargets() const noexcept
+        -> std::unordered_map<TargetCache::Key, AnalysedTargetPtr> {
+        return std::accumulate(
+            cache_targets_.begin(),
+            cache_targets_.end(),
+            std::unordered_map<TargetCache::Key, AnalysedTargetPtr>{},
+            [](auto&& l, auto const& r) {
+                l.insert(r.begin(), r.end());
+                return std::forward<decltype(l)>(l);
+            });
+    }
+
     template <bool kIncludeOrigins = false>
     [[nodiscard]] auto ToResult() const -> ResultType<kIncludeOrigins> {
         ResultType<kIncludeOrigins> result{};
@@ -263,7 +280,10 @@ class ResultTargetMap {
 
     void Clear(gsl::not_null<TaskSystem*> const& ts) {
         for (std::size_t i = 0; i < width_; ++i) {
-            ts->QueueTask([i, this]() { targets_[i].clear(); });
+            ts->QueueTask([i, this]() {
+                targets_[i].clear();
+                cache_targets_[i].clear();
+            });
         }
     }
 
@@ -274,6 +294,9 @@ class ResultTargetMap {
     std::vector<
         std::unordered_map<ConfiguredTarget, gsl::not_null<AnalysedTargetPtr>>>
         targets_{width_};
+    std::vector<
+        std::unordered_map<TargetCache::Key, gsl::not_null<AnalysedTargetPtr>>>
+        cache_targets_{width_};
     std::vector<std::size_t> num_actions_{std::vector<std::size_t>(width_)};
     std::vector<std::size_t> num_blobs_{std::vector<std::size_t>(width_)};
     std::vector<std::size_t> num_trees_{std::vector<std::size_t>(width_)};
-- 
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