Optimize Module Dependency Handling for Efficient Memory Usage

[ayushpareek2003]

Optimized addModuleFiles functions for both CompilerInvocation and CowCompilerInvocation to reduce redundant function calls and improve efficiency

Introduced memory preallocation using reserve() when eager load is enabled to reduce reallocation overhead

Used try_emplace() instead of insert() for PrebuiltModuleFiles to avoid unnecessary overwrites

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[llvmbot]

@llvm/pr-subscribers-clang

Author: Ayush Pareek (ayushpareek2003)

Changes

Optimized addModuleFiles functions for both CompilerInvocation and CowCompilerInvocation to reduce redundant function calls and improve efficiency

Introduced memory preallocation using reserve() when eager load is enabled to reduce reallocation overhead

Used try_emplace() instead of insert() for PrebuiltModuleFiles to avoid unnecessary overwrites

---

Full diff: https://github.com/llvm/llvm-project/pull/132287.diff

1 Files Affected:

• (modified) clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp (+43-21)

diff --git a/clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp b/clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
index d715ef874e002..576b27c6a1132 100644
--- a/clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
+++ b/clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
@@ -394,40 +394,62 @@ void ModuleDepCollector::addModuleMapFiles(
   if (Service.shouldEagerLoadModules())
     return; // Only pcm is needed for eager load.
 
+  // Preallocate memory to avoid multiple allocations
+  CI.getFrontendOpts().ModuleMapFiles.reserve(
+      CI.getFrontendOpts().ModuleMapFiles.size() + ClangModuleDeps.size());
+  
   for (const ModuleID &MID : ClangModuleDeps) {
-    ModuleDeps *MD = ModuleDepsByID.lookup(MID);
-    assert(MD && "Inconsistent dependency info");
-    CI.getFrontendOpts().ModuleMapFiles.push_back(MD->ClangModuleMapFile);
+     
+    if (ModuleDeps *MD = ModuleDepsByID.lookup(MID)) { // Single lookup
+      assert(MD && "Inconsistent dependency info");
+      CI.getFrontendOpts().ModuleMapFiles.emplace_back(MD->ClangModuleMapFile);
+    }
   }
 }
 
 void ModuleDepCollector::addModuleFiles(
     CompilerInvocation &CI, ArrayRef<ModuleID> ClangModuleDeps) const {
+  
+  // Preallocate memory if eager load is enabled
+  if (Service.shouldEagerLoadModules()) {
+    CI.getFrontendOpts().ModuleFiles.reserve(
+        CI.getFrontendOpts().ModuleFiles.size() + ClangModuleDeps.size());
+  }
   for (const ModuleID &MID : ClangModuleDeps) {
-    ModuleDeps *MD = ModuleDepsByID.lookup(MID);
-    std::string PCMPath =
-        Controller.lookupModuleOutput(*MD, ModuleOutputKind::ModuleFile);
-
-    if (Service.shouldEagerLoadModules())
-      CI.getFrontendOpts().ModuleFiles.push_back(std::move(PCMPath));
-    else
-      CI.getHeaderSearchOpts().PrebuiltModuleFiles.insert(
-          {MID.ModuleName, std::move(PCMPath)});
+    if (ModuleDeps *MD = ModuleDepsByID.lookup(MID)) {  
+      std::string PCMPath =
+          Controller.lookupModuleOutput(*MD, ModuleOutputKind::ModuleFile);
+
+      if (Service.shouldEagerLoadModules()) {
+        CI.getFrontendOpts().ModuleFiles.emplace_back(std::move(PCMPath));
+      } else {
+        CI.getHeaderSearchOpts().PrebuiltModuleFiles.try_emplace(
+            MID.ModuleName, std::move(PCMPath));
+      }
+    }
   }
 }
 
 void ModuleDepCollector::addModuleFiles(
     CowCompilerInvocation &CI, ArrayRef<ModuleID> ClangModuleDeps) const {
-  for (const ModuleID &MID : ClangModuleDeps) {
-    ModuleDeps *MD = ModuleDepsByID.lookup(MID);
-    std::string PCMPath =
-        Controller.lookupModuleOutput(*MD, ModuleOutputKind::ModuleFile);
 
-    if (Service.shouldEagerLoadModules())
-      CI.getMutFrontendOpts().ModuleFiles.push_back(std::move(PCMPath));
-    else
-      CI.getMutHeaderSearchOpts().PrebuiltModuleFiles.insert(
-          {MID.ModuleName, std::move(PCMPath)});
+    // Preallocation
+  if (Service.shouldEagerLoadModules()) {
+    CI.getMutFrontendOpts().ModuleFiles.reserve(
+        CI.getMutFrontendOpts().ModuleFiles.size() + ClangModuleDeps.size());
+  }
+  for (const ModuleID &MID : ClangModuleDeps) {
+    if (ModuleDeps *MD = ModuleDepsByID.lookup(MID)) {  
+      std::string PCMPath =
+          Controller.lookupModuleOutput(*MD, ModuleOutputKind::ModuleFile);
+
+      if (EagerLoad) {
+        CI.getMutFrontendOpts().ModuleFiles.emplace_back(std::move(PCMPath));
+      } else {
+        CI.getMutHeaderSearchOpts().PrebuiltModuleFiles.try_emplace(
+            MID.ModuleName, std::move(PCMPath));
+      }
+    }
   }
 }