[Coverage] Explicitly mark the l.h.s of && and || (fixes PR33465)

This makes it possible to view sub-line region counts for the l.h.s of
&& and || expressions in coverage reports.

It also fixes PR33465, which shows an example of incorrect coverage
output for an assignment statement containing '||'.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@315979 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CoverageMappingGen.cpp

@@ -1083,16 +1083,18 @@ struct CounterCoverageMappingBuilder
   }
 
   void VisitBinLAnd(const BinaryOperator *E) {
-    extendRegion(E);
-    Visit(E->getLHS());
+    extendRegion(E->getLHS());
+    propagateCounts(getRegion().getCounter(), E->getLHS());
+    handleFileExit(getEnd(E->getLHS()));
 
     extendRegion(E->getRHS());
     propagateCounts(getRegionCounter(E), E->getRHS());
   }
 
   void VisitBinLOr(const BinaryOperator *E) {
-    extendRegion(E);
-    Visit(E->getLHS());
+    extendRegion(E->getLHS());
+    propagateCounts(getRegion().getCounter(), E->getLHS());
+    handleFileExit(getEnd(E->getLHS()));
 
     extendRegion(E->getRHS());
     propagateCounts(getRegionCounter(E), E->getRHS());

test/CoverageMapping/logical.cpp

@@ -1,13 +1,18 @@
 // RUN: %clang_cc1 -fprofile-instrument=clang -fcoverage-mapping -dump-coverage-mapping -emit-llvm-only -main-file-name logical.cpp %s | FileCheck %s
 
-int main() {                        // CHECK: File 0, [[@LINE]]:12 -> [[@LINE+10]]:2 = #0
+int main() {                        // CHECK: File 0, [[@LINE]]:12 -> [[@LINE+15]]:2 = #0
   bool bt = true;
   bool bf = false;
-  bool a = bt && bf;                // CHECK-NEXT: File 0, [[@LINE]]:18 -> [[@LINE]]:20 = #1
-  a = bt &&
+  bool a = bt && bf;                // CHECK-NEXT: File 0, [[@LINE]]:12 -> [[@LINE]]:14 = #0
+                                    // CHECK-NEXT: File 0, [[@LINE-1]]:18 -> [[@LINE-1]]:20 = #1
+
+  a = bt &&                         // CHECK-NEXT: File 0, [[@LINE]]:7 -> [[@LINE]]:9 = #0
       bf;                           // CHECK-NEXT: File 0, [[@LINE]]:7 -> [[@LINE]]:9 = #2
-  a = bf || bt;                     // CHECK-NEXT: File 0, [[@LINE]]:13 -> [[@LINE]]:15 = #3
-  a = bf ||
+
+  a = bf || bt;                     // CHECK-NEXT: File 0, [[@LINE]]:7 -> [[@LINE]]:9 = #0
+                                    // CHECK-NEXT: File 0, [[@LINE-1]]:13 -> [[@LINE-1]]:15 = #3
+
+  a = bf ||                         // CHECK-NEXT: File 0, [[@LINE]]:7 -> [[@LINE]]:9 = #0
       bt;                           // CHECK-NEXT: File 0, [[@LINE]]:7 -> [[@LINE]]:9 = #4
   return 0;
 }

test/CoverageMapping/macro-expansion.c

@@ -23,10 +23,12 @@
 // CHECK-NEXT: Expansion,File 4, [[@LINE+2]]:20 -> [[@LINE+2]]:22 = (#0 + #8)
 // CHECK-NEXT: File 4, [[@LINE+1]]:36 -> [[@LINE+1]]:37 = (#0 + #8)
 #define M3(x) do { M2(x); } while (0)
-// CHECK-NEXT: File 5, [[@LINE+2]]:15 -> [[@LINE+2]]:27 = #0
+// CHECK-NEXT: File 5, [[@LINE+3]]:15 -> [[@LINE+3]]:27 = #0
+// CHECK-NEXT: File 5, [[@LINE+2]]:16 -> [[@LINE+2]]:19 = #0
 // CHECK-NEXT: File 5, [[@LINE+1]]:23 -> [[@LINE+1]]:26 = #12
 #define M4(x) ((x) && (x))
-// CHECK-NEXT: File 6, [[@LINE+2]]:15 -> [[@LINE+2]]:27 = #0
+// CHECK-NEXT: File 6, [[@LINE+3]]:15 -> [[@LINE+3]]:27 = #0
+// CHECK-NEXT: File 6, [[@LINE+2]]:16 -> [[@LINE+2]]:19 = #0
 // CHECK-NEXT: File 6, [[@LINE+1]]:23 -> [[@LINE+1]]:26 = #14
 #define M5(x) ((x) || (x))
 // CHECK-NEXT: File 7, [[@LINE+1]]:15 -> [[@LINE+1]]:26 = #0