clang/test/Tooling/clang-diff-bottomup.cpp

   1 // RUN: %clang_cc1 -E %s > %t.src.cpp
   2 // RUN: %clang_cc1 -E %s > %t.dst.cpp -DDEST
   3 // RUN: clang-diff -dump-matches -s=0 %t.src.cpp %t.dst.cpp -- | FileCheck %s
   4 //
   5 // Test the bottom-up matching, with maxsize set to 0, so that the optimal matching will never be applied.
   6
   7 #ifndef DEST
   8
   9 void f1() { ; {{;}} }
  10 void f2() { ;; {{;}} }
  11
  12 #else
  13
  14 // Jaccard similarity threshold is 0.5.
  15
  16 void f1() {
  17 // CompoundStmt: 3 matched descendants, subtree sizes 4 and 5
  18 // Jaccard similarity = 3 / (4 + 5 - 3) = 3 / 6 >= 0.5
  19 // CHECK: Match FunctionDecl: f1(void ())(1) to FunctionDecl: f1(void ())(1)
  20 // CHECK: Match CompoundStmt(2) to CompoundStmt(2)
  21 // CHECK: Match CompoundStmt(4) to CompoundStmt(3)
  22 // CHECK: Match CompoundStmt(5) to CompoundStmt(4)
  23 // CHECK: Match NullStmt(6) to NullStmt(5)
  24   {{;}} ;;
  25 }
  26
  27 void f2() {
  28 // CompoundStmt: 3 matched descendants, subtree sizes 4 and 5
  29 // Jaccard similarity = 3 / (5 + 6 - 3) = 3 / 8 < 0.5
  30 // CHECK-NOT: Match FunctionDecl(9)
  31 // CHECK-NOT: Match CompoundStmt(10)
  32 // CHECK: Match CompoundStmt(11) to CompoundStmt(10)
  33 // CHECK: Match CompoundStmt(12) to CompoundStmt(11)
  34 // CHECK: Match NullStmt(13) to NullStmt(12)
  35 // CHECK-NOT: Match NullStmt(13)
  36   {{;}} ;;;
  37 }
  38
  39 #endif