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authorEelco Dolstra <edolstra@gmail.com>2018-06-11T14·06+0200
committerEelco Dolstra <edolstra@gmail.com>2018-06-12T15·49+0200
commit24c68069948681366ff2351dd7400af6e69006d9 (patch)
treeb82b0ab73f4962977cb6a8dc478e36d5ac75c4ef /src/libexpr/eval.cc
parent6ad0a2f749b4db6b24e8b86625883b0b43ad7ba1 (diff)
Cache parse trees
This prevents EvalState::resetFileCache() from parsing everything all
over again.
Diffstat (limited to 'src/libexpr/eval.cc')
-rw-r--r--src/libexpr/eval.cc13
1 files changed, 11 insertions, 2 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 01658aa25f28..facfddbb5300 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -332,7 +332,6 @@ EvalState::EvalState(const Strings & _searchPath, ref<Store> store)
 
 EvalState::~EvalState()
 {
-    fileEvalCache.clear();
 }
 
 
@@ -711,7 +710,17 @@ void EvalState::evalFile(const Path & path_, Value & v)
     }
 
     printTalkative("evaluating file '%1%'", path2);
-    Expr * e = parseExprFromFile(checkSourcePath(path2));
+    Expr * e = nullptr;
+
+    auto j = fileParseCache.find(path2);
+    if (j != fileParseCache.end())
+        e = j->second;
+
+    if (!e)
+        e = parseExprFromFile(checkSourcePath(path2));
+
+    fileParseCache[path2] = e;
+
     try {
         eval(e, v);
     } catch (Error & e) {