commit ddb8f6b83a3fa46c69b9044ad56849b180647e0d
author Bruno Ricci <riccibrun@gmail.com> Sat Dec 22 14:39:30 2018 +0000
committer Bruno Ricci <riccibrun@gmail.com> Sat Dec 22 14:39:30 2018 +0000
tree 46d93792ec03efa2578371efa3e3b13e4f1bdd24
parent 58d38230867528b2cc376a99c2147c89c7af6fcb

[AST] Store the arguments of CXXConstructExpr in a trailing array

Store the arguments of CXXConstructExpr in a trailing array. This is very
similar to the CallExpr case in D55771, with the exception that there is
only one derived class (CXXTemporaryObjectExpr) and that we compute the
offset to the trailing array instead of storing it.

This saves one pointer per CXXConstructExpr and CXXTemporaryObjectExpr.

Reviewed By: rjmccall

Differential Revision: https://reviews.llvm.org/D56022

llvm-svn: 350003

clang/lib/Serialization/ASTReaderStmt.cpp

diff --git a/clang/lib/Serialization/ASTReaderStmt.cpp b/clang/lib/Serialization/ASTReaderStmt.cpp
index 3b5ff78..83b4fcd 100644
--- a/clang/lib/Serialization/ASTReaderStmt.cpp
+++ b/clang/lib/Serialization/ASTReaderStmt.cpp
@@ -1353,20 +1353,22 @@
 
 void ASTStmtReader::VisitCXXConstructExpr(CXXConstructExpr *E) {
   VisitExpr(E);
-  E->NumArgs = Record.readInt();
-  if (E->NumArgs)
-    E->Args = new (Record.getContext()) Stmt*[E->NumArgs];
-  for (unsigned I = 0, N = E->getNumArgs(); I != N; ++I)
-    E->setArg(I, Record.readSubExpr());
-  E->setConstructor(ReadDeclAs<CXXConstructorDecl>());
-  E->setLocation(ReadSourceLocation());
-  E->setElidable(Record.readInt());
-  E->setHadMultipleCandidates(Record.readInt());
-  E->setListInitialization(Record.readInt());
-  E->setStdInitListInitialization(Record.readInt());
-  E->setRequiresZeroInitialization(Record.readInt());
-  E->setConstructionKind((CXXConstructExpr::ConstructionKind)Record.readInt());
+
+  unsigned NumArgs = Record.readInt();
+  assert((NumArgs == E->getNumArgs()) && "Wrong NumArgs!");
+
+  E->CXXConstructExprBits.Elidable = Record.readInt();
+  E->CXXConstructExprBits.HadMultipleCandidates = Record.readInt();
+  E->CXXConstructExprBits.ListInitialization = Record.readInt();
+  E->CXXConstructExprBits.StdInitListInitialization = Record.readInt();
+  E->CXXConstructExprBits.ZeroInitialization = Record.readInt();
+  E->CXXConstructExprBits.ConstructionKind = Record.readInt();
+  E->CXXConstructExprBits.Loc = ReadSourceLocation();
+  E->Constructor = ReadDeclAs<CXXConstructorDecl>();
   E->ParenOrBraceRange = ReadSourceRange();
+
+  for (unsigned I = 0; I != NumArgs; ++I)
+    E->setArg(I, Record.readSubExpr());
 }
 
 void ASTStmtReader::VisitCXXInheritedCtorInitExpr(CXXInheritedCtorInitExpr *E) {
@@ -1379,7 +1381,7 @@
 
 void ASTStmtReader::VisitCXXTemporaryObjectExpr(CXXTemporaryObjectExpr *E) {
   VisitCXXConstructExpr(E);
-  E->Type = GetTypeSourceInfo();
+  E->TSI = GetTypeSourceInfo();
 }
 
 void ASTStmtReader::VisitLambdaExpr(LambdaExpr *E) {
@@ -3082,7 +3084,9 @@
       break;
 
     case EXPR_CXX_CONSTRUCT:
-      S = new (Context) CXXConstructExpr(Empty);
+      S = CXXConstructExpr::CreateEmpty(
+          Context,
+          /* NumArgs=*/Record[ASTStmtReader::NumExprFields]);
       break;
 
     case EXPR_CXX_INHERITED_CTOR_INIT:
@@ -3090,7 +3094,9 @@
       break;
 
     case EXPR_CXX_TEMPORARY_OBJECT:
-      S = new (Context) CXXTemporaryObjectExpr(Empty);
+      S = CXXTemporaryObjectExpr::CreateEmpty(
+          Context,
+          /* NumArgs=*/Record[ASTStmtReader::NumExprFields]);
       break;
 
     case EXPR_CXX_STATIC_CAST:

clang/lib/Serialization/ASTWriterStmt.cpp

diff --git a/clang/lib/Serialization/ASTWriterStmt.cpp b/clang/lib/Serialization/ASTWriterStmt.cpp
index c7527aa..f0e1e10 100644
--- a/clang/lib/Serialization/ASTWriterStmt.cpp
+++ b/clang/lib/Serialization/ASTWriterStmt.cpp
@@ -1315,18 +1315,21 @@
 
 void ASTStmtWriter::VisitCXXConstructExpr(CXXConstructExpr *E) {
   VisitExpr(E);
+
   Record.push_back(E->getNumArgs());
-  for (unsigned I = 0, N = E->getNumArgs(); I != N; ++I)
-    Record.AddStmt(E->getArg(I));
-  Record.AddDeclRef(E->getConstructor());
-  Record.AddSourceLocation(E->getLocation());
   Record.push_back(E->isElidable());
   Record.push_back(E->hadMultipleCandidates());
   Record.push_back(E->isListInitialization());
   Record.push_back(E->isStdInitListInitialization());
   Record.push_back(E->requiresZeroInitialization());
   Record.push_back(E->getConstructionKind()); // FIXME: stable encoding
+  Record.AddSourceLocation(E->getLocation());
+  Record.AddDeclRef(E->getConstructor());
   Record.AddSourceRange(E->getParenOrBraceRange());
+
+  for (unsigned I = 0, N = E->getNumArgs(); I != N; ++I)
+    Record.AddStmt(E->getArg(I));
+
   Code = serialization::EXPR_CXX_CONSTRUCT;
 }