InstrProf: Rewrite most of coverage mapping generation in a simpler way

The coverage mapping generation code previously generated a large
number of redundant coverage regions and then tried to merge similar
ones back together. This then relied on some awkward heuristics to
prevent combining of regions that were importantly different but
happened to have the same count. The end result was inefficient and
hard to follow.

Now, we more carefully create the regions we actually want. This makes
it much easier to create regions at precise locations as well as
making the basic approach quite a bit easier to follow. There's still
a fair bit of complexity here dealing with included code and macro
expansions, but that's pretty hard to avoid without significantly
reducing the quality of data we provide.

I had to modify quite a few tests where the source ranges became more
precise or the old ranges seemed to be wrong anyways, and I've added
quite a few new tests since a large number of constructs didn't seem
to be tested before.

llvm-svn: 229748

1 files changed, 33 insertions, 0 deletions

diff --git a/clang/test/CoverageMapping/md.cpp b/clang/test/CoverageMapping/md.cpp
new file mode 100644
index 00000000000..fff0df35265
--- /dev/null
+++ b/clang/test/CoverageMapping/md.cpp
@@ -0,0 +1,33 @@
+// RUN: %clang_cc1 -fprofile-instr-generate -fcoverage-mapping -dump-coverage-mapping -emit-llvm-only -std=c++11 %s | FileCheck %s
+
+#define BREAK break
+
+enum class MD {
+  Val1,
+  Val2
+};
+
+void nop() {}
+
+// CHECK: foo
+// CHECK-NEXT: File 0, [[@LINE+1]]:16 -> {{[0-9]+}}:2 = #0
+void foo(MD i) {
+  switch (i) {
+  #define HANDLE_MD(X)                                          \
+  case MD::X:                                                   \
+    break;
+  #include "Inputs/md.def"
+  default:
+    BREAK;
+  }
+
+  if (false)
+    nop();
+  #define HANDLE_MD(X) else if (i == MD::X) { nop(); }
+  #include "Inputs/md.def"
+}
+
+int main(int argc, const char *argv[]) {
+  foo(MD::Val1);
+  return 0;
+}