Fixed llvm-cov to count edges instead of blocks.

This was a fundamental flaw in llvm-cov where it treated the values in
the GCDA files as block counts instead of edge counts. This created
incorrect line counts when branching was present. Instead, the edge
counts should be summed to obtain the correct block count.

The fix was tested using custom test files as well as single source
files from the test-suite directory. The behaviour can be verified by
reading the GCOV documentation that describes the GCDA spec ("ARC_COUNTS
gives the counter values for those arcs that are instrumented") and the
header description provided by GCOVProfiling.cpp ("instruments the code
that runs to records (sic) the edges between blocks that run and emit a
complementary "gcda" file on exit").

llvm-svn: 193299

1 files changed, 11 insertions, 2 deletions

diff --git a/llvm/lib/IR/GCOV.cpp b/llvm/lib/IR/GCOV.cpp
index 68b91e6dc9a..908523a3a66 100644
--- a/llvm/lib/IR/GCOV.cpp
+++ b/llvm/lib/IR/GCOV.cpp
@@ -103,9 +103,18 @@ bool GCOVFunction::read(GCOVBuffer &Buff, GCOV::GCOVFormat Format) {
 
   if (Format == GCOV::GCDA_402 || Format == GCOV::GCDA_404) {
     Buff.readArcTag();
+    uint32_t i = 0;
     uint32_t Count = Buff.readInt() / 2;
-    for (unsigned i = 0, e = Count; i != e; ++i) {
-      Blocks[i]->addCount(Buff.readInt64());
+
+    // This for loop adds the counts for each block. A second nested loop is
+    // required to combine the edge counts that are contained in the GCDA file.
+    for (uint32_t Line = 0; i < Count; ++Line) {
+      GCOVBlock &Block = *Blocks[Line];
+      for (size_t Edge = 0, End = Block.getNumEdges(); Edge < End; ++Edge) {
+        assert(i < Count && "Unexpected number of Edges!");
+        Block.addCount(Buff.readInt64());
+        ++i;
+      }
     }
     return true;
   }