r339727 - [CFG] [analyzer] Find argument constructors in CXXTemporaryObjectExprs.

[Artem Dergachev via cfe-commits]

Author: dergachev
Date: Tue Aug 14 14:10:46 2018
New Revision: 339727

URL: http://llvm.org/viewvc/llvm-project?rev=339727&view=rev
Log:
[CFG] [analyzer] Find argument constructors in CXXTemporaryObjectExprs.

CXXTemporaryObjectExpr is a sub-class of CXXConstructExpr. If it has arguments
that are structures passed by value, their respective constructors need to be
handled by providing a ConstructionContext, like for regular function calls and
for regular constructors.

Differential Revision: https://reviews.llvm.org/D50487

Modified:
    cfe/trunk/lib/Analysis/CFG.cpp
    cfe/trunk/test/Analysis/cfg-rich-constructors.cpp

Modified: cfe/trunk/lib/Analysis/CFG.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Analysis/CFG.cpp?rev=339727&r1=339726&r2=339727&view=diff
==============================================================================
--- cfe/trunk/lib/Analysis/CFG.cpp (original)
+++ cfe/trunk/lib/Analysis/CFG.cpp Tue Aug 14 14:10:46 2018
@@ -4352,6 +4352,11 @@ CFGBlock *CFGBuilder::VisitCXXFunctional
 
 CFGBlock *CFGBuilder::VisitCXXTemporaryObjectExpr(CXXTemporaryObjectExpr *C,
                                                   AddStmtChoice asc) {
+  // If the constructor takes objects as arguments by value, we need to properly
+  // construct these objects. Construction contexts we find here aren't for the
+  // constructor C, they're for its arguments only.
+  findConstructionContextsForArguments(C);
+
   autoCreateBlock();
   appendConstructor(Block, C);
   return VisitChildren(C);

Modified: cfe/trunk/test/Analysis/cfg-rich-constructors.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Analysis/cfg-rich-constructors.cpp?rev=339727&r1=339726&r2=339727&view=diff
==============================================================================
--- cfe/trunk/test/Analysis/cfg-rich-constructors.cpp (original)
+++ cfe/trunk/test/Analysis/cfg-rich-constructors.cpp Tue Aug 14 14:10:46 2018
@@ -820,6 +820,7 @@ public:
 class E {
 public:
   E(D d);
+  E(D d1, D d2);
 };
 
 void useC(C c);
@@ -939,6 +940,38 @@ void passArgumentWithDestructorByReferen
 void passArgumentIntoAnotherConstructor() {
   E e = E(D());
 }
+
+
+// CHECK: void passTwoArgumentsIntoAnotherConstructor()
+// CXX11-ELIDE:          1: argument_constructors::D() (CXXConstructExpr, [B1.2], [B1.4], [B1.5], class argument_constructors::D)
+// CXX11-NOELIDE:          1: argument_constructors::D() (CXXConstructExpr, [B1.2], [B1.4], class argument_constructors::D)
+// CXX11-NEXT:     2: [B1.1] (BindTemporary)
+// CXX11-NEXT:     3: [B1.2] (ImplicitCastExpr, NoOp, const class argument_constructors::D)
+// CXX11-NEXT:     4: [B1.3]
+// CXX11-NEXT:     5: [B1.4] (CXXConstructExpr, [B1.6], [B1.13]+0, class argument_constructors::D)
+// CXX11-NEXT:     6: [B1.5] (BindTemporary)
+// CXX11-ELIDE-NEXT:     7: argument_constructors::D() (CXXConstructExpr, [B1.8], [B1.10], [B1.11], class argument_constructors::D)
+// CXX11-NOELIDE-NEXT:     7: argument_constructors::D() (CXXConstructExpr, [B1.8], [B1.10], class argument_constructors::D)
+// CXX11-NEXT:     8: [B1.7] (BindTemporary)
+// CXX11-NEXT:     9: [B1.8] (ImplicitCastExpr, NoOp, const class argument_constructors::D)
+// CXX11-NEXT:    10: [B1.9]
+// CXX11-NEXT:    11: [B1.10] (CXXConstructExpr, [B1.12], [B1.13]+1, class argument_constructors::D)
+// CXX11-NEXT:    12: [B1.11] (BindTemporary)
+// CXX11-NEXT:    13: argument_constructors::E([B1.6], [B1.12]) (CXXConstructExpr, class argument_constructors::E)
+// CXX11-NEXT:    14: ~argument_constructors::D() (Temporary object destructor)
+// CXX11-NEXT:    15: ~argument_constructors::D() (Temporary object destructor)
+// CXX11-NEXT:    16: ~argument_constructors::D() (Temporary object destructor)
+// CXX11-NEXT:    17: ~argument_constructors::D() (Temporary object destructor)
+// CXX17:          1: argument_constructors::D() (CXXConstructExpr, [B1.2], [B1.5]+0, class argument_constructors::D)
+// CXX17-NEXT:     2: [B1.1] (BindTemporary)
+// CXX17-NEXT:     3: argument_constructors::D() (CXXConstructExpr, [B1.4], [B1.5]+1, class argument_constructors::D)
+// CXX17-NEXT:     4: [B1.3] (BindTemporary)
+// CXX17-NEXT:     5: argument_constructors::E([B1.2], [B1.4]) (CXXConstructExpr, class argument_constructors::E)
+// CXX17-NEXT:     6: ~argument_constructors::D() (Temporary object destructor)
+// CXX17-NEXT:     7: ~argument_constructors::D() (Temporary object destructor)
+void passTwoArgumentsIntoAnotherConstructor() {
+  E(D(), D());
+}
 } // end namespace argument_constructors
 
 namespace copy_elision_with_extra_arguments {