Update to LLVM 3.5a.

Change-Id: Ifadecab779f128e62e430c2b4f6ddd84953ed617
diff --git a/test/tools/llvm-cov/Inputs/copy_block_helper.gcda b/test/tools/llvm-cov/Inputs/copy_block_helper.gcda
new file mode 100644
index 0000000..d7ff469
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/copy_block_helper.gcda
Binary files differ
diff --git a/test/tools/llvm-cov/Inputs/copy_block_helper.gcno b/test/tools/llvm-cov/Inputs/copy_block_helper.gcno
new file mode 100644
index 0000000..a9d1084
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/copy_block_helper.gcno
Binary files differ
diff --git a/test/tools/llvm-cov/Inputs/test.cpp b/test/tools/llvm-cov/Inputs/test.cpp
index 07bc3f2..e580e5a 100644
--- a/test/tools/llvm-cov/Inputs/test.cpp
+++ b/test/tools/llvm-cov/Inputs/test.cpp
@@ -1,3 +1,4 @@
+#include "test.h"
 #include <cstdlib>
 
 bool on = false;
@@ -6,10 +7,6 @@
 const char * hello = "world";
 const char * world = "hello";
 
-struct A {
-  virtual void B();
-};
-
 void A::B() {}
 
 void useless() {}
diff --git a/test/tools/llvm-cov/Inputs/test.cpp.gcov b/test/tools/llvm-cov/Inputs/test.cpp.gcov
deleted file mode 100644
index a3dacc2..0000000
--- a/test/tools/llvm-cov/Inputs/test.cpp.gcov
+++ /dev/null
@@ -1,82 +0,0 @@
-        -:    0:Source:test.cpp
-        -:    0:Graph:test.gcno
-        -:    0:Data:test.gcda
-        -:    0:Runs:2
-        -:    0:Programs:1
-        -:    1:#include <cstdlib>
-        -:    2:
-        -:    3:bool on = false;
-        -:    4:int len = 42;
-        -:    5:double grid[10][10] = {0};
-        -:    6:const char * hello = "world";
-        -:    7:const char * world = "hello";
-        -:    8:
-        4:    9:struct A {
-        -:   10:  virtual void B();
-        -:   11:};
-        -:   12:
-8589934592:   13:void A::B() {}
-        -:   14:
-    #####:   15:void useless() {}
-        -:   16:
-        -:   17:double more_useless() {
-    #####:   18:  return 0;
-        -:   19:}
-        -:   20:
-        -:   21:int foo() {
-        2:   22:  on = true;
-        2:   23:  return 3;
-        -:   24:}
-        -:   25:
-        -:   26:int bar() {
-    #####:   27:  len--;
-    #####:   28:  return foo() + 45;
-        -:   29:}
-        -:   30:
-        8:   31:void assign(int ii, int jj) {
-        8:   32:  grid[ii][jj] = (ii+1) * (jj+1);
-        8:   33:}
-        -:   34:
-        -:   35:void initialize_grid() {
-       12:   36:  for (int ii = 0; ii < 2; ii++)
-       24:   37:    for (int jj = 0; jj < 2; jj++)
-       12:   38:      assign(ii, jj);
-        2:   39:}
-        -:   40:
-        -:   41:int main() {
-        2:   42:  initialize_grid();
-        -:   43:
-        2:   44:  int a = 2;
-        2:   45:  on = rand() % 2;
-        2:   46:  if (on) {
-        2:   47:    foo();
-        2:   48:    ++a;
-        2:   49:  } else {
-    #####:   50:    bar();
-    #####:   51:    a += rand();
-        -:   52:  }
-        -:   53:
-       44:   54:  for (int ii = 0; ii < 10; ++ii) {
-       20:   55:    switch (rand() % 5) {
-        -:   56:      case 0:
-        4:   57:        a += rand();
-        4:   58:        break;
-        -:   59:      case 1:
-        -:   60:      case 2:
-        2:   61:        a += rand() / rand();
-        2:   62:        break;
-        -:   63:      case 3:
-        6:   64:        a -= rand();
-        6:   65:        break;
-        -:   66:      default:
-        8:   67:        a = -1;
-        8:   68:    }
-       20:   69:  }
-        -:   70:
-        2:   71:  A thing;
-17179869188:   72:  for (uint64_t ii = 0; ii < 4294967296; ++ii)
-8589934592:   73:    thing.B();
-        -:   74:
-        2:   75:  return a + 8 + grid[2][3] + len;
-        -:   76:  return more_useless();
-        -:   77:}
diff --git a/test/tools/llvm-cov/Inputs/test.gcda b/test/tools/llvm-cov/Inputs/test.gcda
index 23d03bd..613e3a8 100644
--- a/test/tools/llvm-cov/Inputs/test.gcda
+++ b/test/tools/llvm-cov/Inputs/test.gcda
Binary files differ
diff --git a/test/tools/llvm-cov/Inputs/test.gcno b/test/tools/llvm-cov/Inputs/test.gcno
index 6162604..24f1c82 100644
--- a/test/tools/llvm-cov/Inputs/test.gcno
+++ b/test/tools/llvm-cov/Inputs/test.gcno
Binary files differ
diff --git a/test/tools/llvm-cov/Inputs/test.h b/test/tools/llvm-cov/Inputs/test.h
new file mode 100644
index 0000000..55d9c6a
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test.h
@@ -0,0 +1,3 @@
+struct A {
+  virtual void B();
+};
diff --git a/test/tools/llvm-cov/Inputs/test_-a.cpp.gcov b/test/tools/llvm-cov/Inputs/test_-a.cpp.gcov
new file mode 100644
index 0000000..c2210d5
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_-a.cpp.gcov
@@ -0,0 +1,111 @@
+        -:    0:Source:test.cpp
+        -:    0:Graph:test.gcno
+        -:    0:Data:test.gcda
+        -:    0:Runs:2
+        -:    0:Programs:1
+        -:    1:#include "test.h"
+        -:    2:#include <cstdlib>
+        -:    3:
+        -:    4:bool on = false;
+        -:    5:int len = 42;
+        -:    6:double grid[10][10] = {0};
+        -:    7:const char * hello = "world";
+        -:    8:const char * world = "hello";
+        -:    9:
+8589934592:   10:void A::B() {}
+8589934592:   10-block  0
+        -:   11:
+    #####:   12:void useless() {}
+    $$$$$:   12-block  0
+        -:   13:
+        -:   14:double more_useless() {
+    #####:   15:  return 0;
+    $$$$$:   15-block  0
+        -:   16:}
+        -:   17:
+        -:   18:int foo() {
+        2:   19:  on = true;
+        2:   20:  return 3;
+        2:   20-block  0
+        -:   21:}
+        -:   22:
+        -:   23:int bar() {
+    #####:   24:  len--;
+    #####:   25:  return foo() + 45;
+    $$$$$:   25-block  0
+        -:   26:}
+        -:   27:
+        8:   28:void assign(int ii, int jj) {
+        8:   29:  grid[ii][jj] = (ii+1) * (jj+1);
+        8:   30:}
+        8:   30-block  0
+        -:   31:
+        -:   32:void initialize_grid() {
+        6:   33:  for (int ii = 0; ii < 2; ii++)
+        2:   33-block  0
+        6:   33-block  1
+        4:   33-block  2
+       12:   34:    for (int jj = 0; jj < 2; jj++)
+        4:   34-block  0
+       12:   34-block  1
+        8:   34-block  2
+        8:   35:      assign(ii, jj);
+        8:   35-block  0
+        4:   35-block  1
+        2:   36:}
+        2:   36-block  0
+        -:   37:
+        -:   38:int main() {
+        2:   39:  initialize_grid();
+        -:   40:
+        2:   41:  int a = 2;
+        2:   42:  on = rand() % 2;
+        2:   43:  if (on) {
+        2:   43-block  0
+        2:   44:    foo();
+        2:   45:    ++a;
+        2:   46:  } else {
+        2:   46-block  0
+    #####:   47:    bar();
+    #####:   48:    a += rand();
+    $$$$$:   48-block  0
+        -:   49:  }
+        -:   50:
+       22:   51:  for (int ii = 0; ii < 10; ++ii) {
+        2:   51-block  0
+       22:   51-block  1
+       20:   51-block  2
+       20:   52:    switch (rand() % 5) {
+       20:   52-block  0
+        -:   53:      case 0:
+        4:   54:        a += rand();
+        4:   55:        break;
+        4:   55-block  0
+        -:   56:      case 1:
+        -:   57:      case 2:
+        2:   58:        a += rand() / rand();
+        2:   59:        break;
+        2:   59-block  0
+        -:   60:      case 3:
+        6:   61:        a -= rand();
+        6:   62:        break;
+        6:   62-block  0
+        -:   63:      default:
+        8:   64:        a = -1;
+        8:   65:    }
+        8:   65-block  0
+       20:   66:  }
+       20:   66-block  0
+        -:   67:
+        2:   68:  A thing;
+8589934594:   69:  for (uint64_t ii = 0; ii < 4294967296; ++ii)
+        2:   69-block  0
+8589934594:   69-block  1
+8589934592:   69-block  2
+8589934592:   70:    thing.B();
+8589934592:   70-block  0
+        -:   71:
+        2:   72:  return a + 8 + grid[2][3] + len;
+        2:   72-block  0
+        -:   73:  return more_useless();
+        -:   74:}
diff --git a/test/tools/llvm-cov/Inputs/test_-a.h.gcov b/test/tools/llvm-cov/Inputs/test_-a.h.gcov
new file mode 100644
index 0000000..a5fe62b
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_-a.h.gcov
@@ -0,0 +1,10 @@
+        -:    0:Source:./test.h
+        -:    0:Graph:test.gcno
+        -:    0:Data:test.gcda
+        -:    0:Runs:2
+        -:    0:Programs:1
+        2:    1:struct A {
+        2:    1-block  0
+        2:    1-block  1
+        -:    2:  virtual void B();
+        -:    3:};
diff --git a/test/tools/llvm-cov/Inputs/test_-a_-b.cpp.gcov b/test/tools/llvm-cov/Inputs/test_-a_-b.cpp.gcov
new file mode 100644
index 0000000..ae21037
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_-a_-b.cpp.gcov
@@ -0,0 +1,134 @@
+        -:    0:Source:test.cpp
+        -:    0:Graph:test.gcno
+        -:    0:Data:test.gcda
+        -:    0:Runs:2
+        -:    0:Programs:1
+        -:    1:#include "test.h"
+        -:    2:#include <cstdlib>
+        -:    3:
+        -:    4:bool on = false;
+        -:    5:int len = 42;
+        -:    6:double grid[10][10] = {0};
+        -:    7:const char * hello = "world";
+        -:    8:const char * world = "hello";
+        -:    9:
+function _ZN1A1BEv called 8589934592 returned 100% blocks executed 100%
+8589934592:   10:void A::B() {}
+8589934592:   10-block  0
+        -:   11:
+function _Z7uselessv called 0 returned 0% blocks executed 0%
+    #####:   12:void useless() {}
+    $$$$$:   12-block  0
+        -:   13:
+function _Z12more_uselessv called 0 returned 0% blocks executed 0%
+        -:   14:double more_useless() {
+    #####:   15:  return 0;
+    $$$$$:   15-block  0
+        -:   16:}
+        -:   17:
+function _Z3foov called 2 returned 100% blocks executed 100%
+        -:   18:int foo() {
+        2:   19:  on = true;
+        2:   20:  return 3;
+        2:   20-block  0
+        -:   21:}
+        -:   22:
+function _Z3barv called 0 returned 0% blocks executed 0%
+        -:   23:int bar() {
+    #####:   24:  len--;
+    #####:   25:  return foo() + 45;
+    $$$$$:   25-block  0
+        -:   26:}
+        -:   27:
+function _Z6assignii called 8 returned 100% blocks executed 100%
+        8:   28:void assign(int ii, int jj) {
+        8:   29:  grid[ii][jj] = (ii+1) * (jj+1);
+        8:   30:}
+        8:   30-block  0
+        -:   31:
+function _Z15initialize_gridv called 2 returned 100% blocks executed 100%
+        -:   32:void initialize_grid() {
+        6:   33:  for (int ii = 0; ii < 2; ii++)
+        2:   33-block  0
+        6:   33-block  1
+branch  0 taken 67%
+branch  1 taken 33%
+        4:   33-block  2
+       12:   34:    for (int jj = 0; jj < 2; jj++)
+        4:   34-block  0
+       12:   34-block  1
+branch  0 taken 67%
+branch  1 taken 33%
+        8:   34-block  2
+        8:   35:      assign(ii, jj);
+        8:   35-block  0
+        4:   35-block  1
+        2:   36:}
+        2:   36-block  0
+        -:   37:
+function main called 2 returned 100% blocks executed 94%
+        -:   38:int main() {
+        2:   39:  initialize_grid();
+        -:   40:
+        2:   41:  int a = 2;
+        2:   42:  on = rand() % 2;
+        2:   43:  if (on) {
+        2:   43-block  0
+branch  0 taken 100%
+branch  1 taken 0%
+        2:   44:    foo();
+        2:   45:    ++a;
+        2:   46:  } else {
+        2:   46-block  0
+    #####:   47:    bar();
+    #####:   48:    a += rand();
+    $$$$$:   48-block  0
+        -:   49:  }
+        -:   50:
+       22:   51:  for (int ii = 0; ii < 10; ++ii) {
+        2:   51-block  0
+       22:   51-block  1
+branch  0 taken 91%
+branch  1 taken 9%
+       20:   51-block  2
+       20:   52:    switch (rand() % 5) {
+       20:   52-block  0
+branch  0 taken 20%
+branch  1 taken 0%
+branch  2 taken 10%
+branch  3 taken 30%
+branch  4 taken 40%
+        -:   53:      case 0:
+        4:   54:        a += rand();
+        4:   55:        break;
+        4:   55-block  0
+        -:   56:      case 1:
+        -:   57:      case 2:
+        2:   58:        a += rand() / rand();
+        2:   59:        break;
+        2:   59-block  0
+        -:   60:      case 3:
+        6:   61:        a -= rand();
+        6:   62:        break;
+        6:   62-block  0
+        -:   63:      default:
+        8:   64:        a = -1;
+        8:   65:    }
+        8:   65-block  0
+       20:   66:  }
+       20:   66-block  0
+        -:   67:
+        2:   68:  A thing;
+8589934594:   69:  for (uint64_t ii = 0; ii < 4294967296; ++ii)
+        2:   69-block  0
+8589934594:   69-block  1
+branch  0 taken 99%
+branch  1 taken 1%
+8589934592:   69-block  2
+8589934592:   70:    thing.B();
+8589934592:   70-block  0
+        -:   71:
+        2:   72:  return a + 8 + grid[2][3] + len;
+        2:   72-block  0
+        -:   73:  return more_useless();
+        -:   74:}
diff --git a/test/tools/llvm-cov/Inputs/test_-a_-b.h.gcov b/test/tools/llvm-cov/Inputs/test_-a_-b.h.gcov
new file mode 100644
index 0000000..f3dabcb
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_-a_-b.h.gcov
@@ -0,0 +1,12 @@
+        -:    0:Source:./test.h
+        -:    0:Graph:test.gcno
+        -:    0:Data:test.gcda
+        -:    0:Runs:2
+        -:    0:Programs:1
+function _ZN1AC1Ev called 2 returned 100% blocks executed 100%
+function _ZN1AC2Ev called 2 returned 100% blocks executed 100%
+        2:    1:struct A {
+        2:    1-block  0
+        2:    1-block  1
+        -:    2:  virtual void B();
+        -:    3:};
diff --git a/test/tools/llvm-cov/Inputs/test_-a_-b_-c_-u.cpp.gcov b/test/tools/llvm-cov/Inputs/test_-a_-b_-c_-u.cpp.gcov
new file mode 100644
index 0000000..cc5940f
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_-a_-b_-c_-u.cpp.gcov
@@ -0,0 +1,160 @@
+        -:    0:Source:test.cpp
+        -:    0:Graph:test.gcno
+        -:    0:Data:test.gcda
+        -:    0:Runs:2
+        -:    0:Programs:1
+        -:    1:#include "test.h"
+        -:    2:#include <cstdlib>
+        -:    3:
+        -:    4:bool on = false;
+        -:    5:int len = 42;
+        -:    6:double grid[10][10] = {0};
+        -:    7:const char * hello = "world";
+        -:    8:const char * world = "hello";
+        -:    9:
+function _ZN1A1BEv called 8589934592 returned 100% blocks executed 100%
+8589934592:   10:void A::B() {}
+8589934592:   10-block  0
+unconditional  0 taken 8589934592
+        -:   11:
+function _Z7uselessv called 0 returned 0% blocks executed 0%
+    #####:   12:void useless() {}
+    $$$$$:   12-block  0
+unconditional  0 never executed
+        -:   13:
+function _Z12more_uselessv called 0 returned 0% blocks executed 0%
+        -:   14:double more_useless() {
+    #####:   15:  return 0;
+    $$$$$:   15-block  0
+unconditional  0 never executed
+        -:   16:}
+        -:   17:
+function _Z3foov called 2 returned 100% blocks executed 100%
+        -:   18:int foo() {
+        2:   19:  on = true;
+        2:   20:  return 3;
+        2:   20-block  0
+unconditional  0 taken 2
+        -:   21:}
+        -:   22:
+function _Z3barv called 0 returned 0% blocks executed 0%
+        -:   23:int bar() {
+    #####:   24:  len--;
+    #####:   25:  return foo() + 45;
+    $$$$$:   25-block  0
+unconditional  0 never executed
+        -:   26:}
+        -:   27:
+function _Z6assignii called 8 returned 100% blocks executed 100%
+        8:   28:void assign(int ii, int jj) {
+        8:   29:  grid[ii][jj] = (ii+1) * (jj+1);
+        8:   30:}
+        8:   30-block  0
+unconditional  0 taken 8
+        -:   31:
+function _Z15initialize_gridv called 2 returned 100% blocks executed 100%
+        -:   32:void initialize_grid() {
+        6:   33:  for (int ii = 0; ii < 2; ii++)
+        2:   33-block  0
+unconditional  0 taken 2
+        6:   33-block  1
+branch  1 taken 4
+branch  2 taken 2
+        4:   33-block  2
+unconditional  3 taken 4
+       12:   34:    for (int jj = 0; jj < 2; jj++)
+        4:   34-block  0
+unconditional  0 taken 4
+       12:   34-block  1
+branch  1 taken 8
+branch  2 taken 4
+        8:   34-block  2
+unconditional  3 taken 8
+        8:   35:      assign(ii, jj);
+        8:   35-block  0
+unconditional  0 taken 8
+        4:   35-block  1
+unconditional  1 taken 4
+        2:   36:}
+        2:   36-block  0
+unconditional  0 taken 2
+        -:   37:
+function main called 2 returned 100% blocks executed 94%
+        -:   38:int main() {
+        2:   39:  initialize_grid();
+        -:   40:
+        2:   41:  int a = 2;
+        2:   42:  on = rand() % 2;
+        2:   43:  if (on) {
+        2:   43-block  0
+branch  0 taken 2
+branch  1 taken 0
+        2:   44:    foo();
+        2:   45:    ++a;
+        2:   46:  } else {
+        2:   46-block  0
+unconditional  0 taken 2
+    #####:   47:    bar();
+    #####:   48:    a += rand();
+    $$$$$:   48-block  0
+unconditional  0 never executed
+        -:   49:  }
+        -:   50:
+       22:   51:  for (int ii = 0; ii < 10; ++ii) {
+        2:   51-block  0
+unconditional  0 taken 2
+       22:   51-block  1
+branch  1 taken 20
+branch  2 taken 2
+       20:   51-block  2
+unconditional  3 taken 20
+       20:   52:    switch (rand() % 5) {
+       20:   52-block  0
+branch  0 taken 4
+branch  1 taken 0
+branch  2 taken 2
+branch  3 taken 6
+branch  4 taken 8
+        -:   53:      case 0:
+        4:   54:        a += rand();
+        4:   55:        break;
+        4:   55-block  0
+unconditional  0 taken 4
+        -:   56:      case 1:
+        -:   57:      case 2:
+        2:   58:        a += rand() / rand();
+        2:   59:        break;
+        2:   59-block  0
+unconditional  0 taken 2
+        -:   60:      case 3:
+        6:   61:        a -= rand();
+        6:   62:        break;
+        6:   62-block  0
+unconditional  0 taken 6
+        -:   63:      default:
+        8:   64:        a = -1;
+        8:   65:    }
+        8:   65-block  0
+unconditional  0 taken 8
+       20:   66:  }
+       20:   66-block  0
+unconditional  0 taken 20
+        -:   67:
+        2:   68:  A thing;
+8589934594:   69:  for (uint64_t ii = 0; ii < 4294967296; ++ii)
+        2:   69-block  0
+unconditional  0 taken 2
+8589934594:   69-block  1
+branch  1 taken 8589934592
+branch  2 taken 2
+8589934592:   69-block  2
+unconditional  3 taken 8589934592
+8589934592:   70:    thing.B();
+8589934592:   70-block  0
+unconditional  0 taken 8589934592
+        -:   71:
+        2:   72:  return a + 8 + grid[2][3] + len;
+        2:   72-block  0
+unconditional  0 taken 2
+        -:   73:  return more_useless();
+        -:   74:}
diff --git a/test/tools/llvm-cov/Inputs/test_-a_-b_-c_-u.h.gcov b/test/tools/llvm-cov/Inputs/test_-a_-b_-c_-u.h.gcov
new file mode 100644
index 0000000..840324e
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_-a_-b_-c_-u.h.gcov
@@ -0,0 +1,14 @@
+        -:    0:Source:./test.h
+        -:    0:Graph:test.gcno
+        -:    0:Data:test.gcda
+        -:    0:Runs:2
+        -:    0:Programs:1
+function _ZN1AC1Ev called 2 returned 100% blocks executed 100%
+function _ZN1AC2Ev called 2 returned 100% blocks executed 100%
+        2:    1:struct A {
+        2:    1-block  0
+unconditional  0 taken 2
+        2:    1-block  1
+unconditional  1 taken 2
+        -:    2:  virtual void B();
+        -:    3:};
diff --git a/test/tools/llvm-cov/Inputs/test_-a_-b_-u.cpp.gcov b/test/tools/llvm-cov/Inputs/test_-a_-b_-u.cpp.gcov
new file mode 100644
index 0000000..0d2c6b3
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_-a_-b_-u.cpp.gcov
@@ -0,0 +1,160 @@
+        -:    0:Source:test.cpp
+        -:    0:Graph:test.gcno
+        -:    0:Data:test.gcda
+        -:    0:Runs:2
+        -:    0:Programs:1
+        -:    1:#include "test.h"
+        -:    2:#include <cstdlib>
+        -:    3:
+        -:    4:bool on = false;
+        -:    5:int len = 42;
+        -:    6:double grid[10][10] = {0};
+        -:    7:const char * hello = "world";
+        -:    8:const char * world = "hello";
+        -:    9:
+function _ZN1A1BEv called 8589934592 returned 100% blocks executed 100%
+8589934592:   10:void A::B() {}
+8589934592:   10-block  0
+unconditional  0 taken 100%
+        -:   11:
+function _Z7uselessv called 0 returned 0% blocks executed 0%
+    #####:   12:void useless() {}
+    $$$$$:   12-block  0
+unconditional  0 never executed
+        -:   13:
+function _Z12more_uselessv called 0 returned 0% blocks executed 0%
+        -:   14:double more_useless() {
+    #####:   15:  return 0;
+    $$$$$:   15-block  0
+unconditional  0 never executed
+        -:   16:}
+        -:   17:
+function _Z3foov called 2 returned 100% blocks executed 100%
+        -:   18:int foo() {
+        2:   19:  on = true;
+        2:   20:  return 3;
+        2:   20-block  0
+unconditional  0 taken 100%
+        -:   21:}
+        -:   22:
+function _Z3barv called 0 returned 0% blocks executed 0%
+        -:   23:int bar() {
+    #####:   24:  len--;
+    #####:   25:  return foo() + 45;
+    $$$$$:   25-block  0
+unconditional  0 never executed
+        -:   26:}
+        -:   27:
+function _Z6assignii called 8 returned 100% blocks executed 100%
+        8:   28:void assign(int ii, int jj) {
+        8:   29:  grid[ii][jj] = (ii+1) * (jj+1);
+        8:   30:}
+        8:   30-block  0
+unconditional  0 taken 100%
+        -:   31:
+function _Z15initialize_gridv called 2 returned 100% blocks executed 100%
+        -:   32:void initialize_grid() {
+        6:   33:  for (int ii = 0; ii < 2; ii++)
+        2:   33-block  0
+unconditional  0 taken 100%
+        6:   33-block  1
+branch  1 taken 67%
+branch  2 taken 33%
+        4:   33-block  2
+unconditional  3 taken 100%
+       12:   34:    for (int jj = 0; jj < 2; jj++)
+        4:   34-block  0
+unconditional  0 taken 100%
+       12:   34-block  1
+branch  1 taken 67%
+branch  2 taken 33%
+        8:   34-block  2
+unconditional  3 taken 100%
+        8:   35:      assign(ii, jj);
+        8:   35-block  0
+unconditional  0 taken 100%
+        4:   35-block  1
+unconditional  1 taken 100%
+        2:   36:}
+        2:   36-block  0
+unconditional  0 taken 100%
+        -:   37:
+function main called 2 returned 100% blocks executed 94%
+        -:   38:int main() {
+        2:   39:  initialize_grid();
+        -:   40:
+        2:   41:  int a = 2;
+        2:   42:  on = rand() % 2;
+        2:   43:  if (on) {
+        2:   43-block  0
+branch  0 taken 100%
+branch  1 taken 0%
+        2:   44:    foo();
+        2:   45:    ++a;
+        2:   46:  } else {
+        2:   46-block  0
+unconditional  0 taken 100%
+    #####:   47:    bar();
+    #####:   48:    a += rand();
+    $$$$$:   48-block  0
+unconditional  0 never executed
+        -:   49:  }
+        -:   50:
+       22:   51:  for (int ii = 0; ii < 10; ++ii) {
+        2:   51-block  0
+unconditional  0 taken 100%
+       22:   51-block  1
+branch  1 taken 91%
+branch  2 taken 9%
+       20:   51-block  2
+unconditional  3 taken 100%
+       20:   52:    switch (rand() % 5) {
+       20:   52-block  0
+branch  0 taken 20%
+branch  1 taken 0%
+branch  2 taken 10%
+branch  3 taken 30%
+branch  4 taken 40%
+        -:   53:      case 0:
+        4:   54:        a += rand();
+        4:   55:        break;
+        4:   55-block  0
+unconditional  0 taken 100%
+        -:   56:      case 1:
+        -:   57:      case 2:
+        2:   58:        a += rand() / rand();
+        2:   59:        break;
+        2:   59-block  0
+unconditional  0 taken 100%
+        -:   60:      case 3:
+        6:   61:        a -= rand();
+        6:   62:        break;
+        6:   62-block  0
+unconditional  0 taken 100%
+        -:   63:      default:
+        8:   64:        a = -1;
+        8:   65:    }
+        8:   65-block  0
+unconditional  0 taken 100%
+       20:   66:  }
+       20:   66-block  0
+unconditional  0 taken 100%
+        -:   67:
+        2:   68:  A thing;
+8589934594:   69:  for (uint64_t ii = 0; ii < 4294967296; ++ii)
+        2:   69-block  0
+unconditional  0 taken 100%
+8589934594:   69-block  1
+branch  1 taken 99%
+branch  2 taken 1%
+8589934592:   69-block  2
+unconditional  3 taken 100%
+8589934592:   70:    thing.B();
+8589934592:   70-block  0
+unconditional  0 taken 100%
+        -:   71:
+        2:   72:  return a + 8 + grid[2][3] + len;
+        2:   72-block  0
+unconditional  0 taken 100%
+        -:   73:  return more_useless();
+        -:   74:}
diff --git a/test/tools/llvm-cov/Inputs/test_-a_-b_-u.h.gcov b/test/tools/llvm-cov/Inputs/test_-a_-b_-u.h.gcov
new file mode 100644
index 0000000..e7fa658
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_-a_-b_-u.h.gcov
@@ -0,0 +1,14 @@
+        -:    0:Source:./test.h
+        -:    0:Graph:test.gcno
+        -:    0:Data:test.gcda
+        -:    0:Runs:2
+        -:    0:Programs:1
+function _ZN1AC1Ev called 2 returned 100% blocks executed 100%
+function _ZN1AC2Ev called 2 returned 100% blocks executed 100%
+        2:    1:struct A {
+        2:    1-block  0
+unconditional  0 taken 100%
+        2:    1-block  1
+unconditional  1 taken 100%
+        -:    2:  virtual void B();
+        -:    3:};
diff --git a/test/tools/llvm-cov/Inputs/test_-b.output b/test/tools/llvm-cov/Inputs/test_-b.output
new file mode 100644
index 0000000..515987d
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_-b.output
@@ -0,0 +1,13 @@
+File 'test.cpp'
+Lines executed:84.21% of 38
+Branches executed:100.00% of 15
+Taken at least once:86.67% of 15
+No calls
+test.cpp:creating 'test.cpp.gcov'
+
+File './test.h'
+Lines executed:100.00% of 1
+No branches
+No calls
+./test.h:creating 'test.h.gcov'
+
diff --git a/test/tools/llvm-cov/Inputs/test_-b_-f.output b/test/tools/llvm-cov/Inputs/test_-b_-f.output
new file mode 100644
index 0000000..c3ccd05
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_-b_-f.output
@@ -0,0 +1,65 @@
+Function '_ZN1A1BEv'
+Lines executed:100.00% of 1
+No branches
+No calls
+
+Function '_Z7uselessv'
+Lines executed:0.00% of 1
+No branches
+No calls
+
+Function '_Z12more_uselessv'
+Lines executed:0.00% of 1
+No branches
+No calls
+
+Function '_Z3foov'
+Lines executed:100.00% of 2
+No branches
+No calls
+
+Function '_Z3barv'
+Lines executed:0.00% of 2
+No branches
+No calls
+
+Function '_Z6assignii'
+Lines executed:100.00% of 3
+No branches
+No calls
+
+Function '_Z15initialize_gridv'
+Lines executed:100.00% of 4
+Branches executed:100.00% of 4
+Taken at least once:100.00% of 4
+No calls
+
+Function 'main'
+Lines executed:91.67% of 24
+Branches executed:100.00% of 11
+Taken at least once:81.82% of 11
+No calls
+
+Function '_ZN1AC1Ev'
+Lines executed:100.00% of 1
+No branches
+No calls
+
+Function '_ZN1AC2Ev'
+No executable lines
+No branches
+No calls
+
+File 'test.cpp'
+Lines executed:84.21% of 38
+Branches executed:100.00% of 15
+Taken at least once:86.67% of 15
+No calls
+test.cpp:creating 'test.cpp.gcov'
+
+File './test.h'
+Lines executed:100.00% of 1
+No branches
+No calls
+./test.h:creating 'test.h.gcov'
+
diff --git a/test/tools/llvm-cov/Inputs/test_-f.output b/test/tools/llvm-cov/Inputs/test_-f.output
new file mode 100644
index 0000000..d97aa18
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_-f.output
@@ -0,0 +1,38 @@
+Function '_ZN1A1BEv'
+Lines executed:100.00% of 1
+
+Function '_Z7uselessv'
+Lines executed:0.00% of 1
+
+Function '_Z12more_uselessv'
+Lines executed:0.00% of 1
+
+Function '_Z3foov'
+Lines executed:100.00% of 2
+
+Function '_Z3barv'
+Lines executed:0.00% of 2
+
+Function '_Z6assignii'
+Lines executed:100.00% of 3
+
+Function '_Z15initialize_gridv'
+Lines executed:100.00% of 4
+
+Function 'main'
+Lines executed:91.67% of 24
+
+Function '_ZN1AC1Ev'
+Lines executed:100.00% of 1
+
+Function '_ZN1AC2Ev'
+Lines executed:100.00% of 1
+
+File 'test.cpp'
+Lines executed:84.21% of 38
+test.cpp:creating 'test.cpp.gcov'
+
+File './test.h'
+Lines executed:100.00% of 1
+./test.h:creating 'test.h.gcov'
+
diff --git a/test/tools/llvm-cov/Inputs/test_file_checksum_fail.gcda b/test/tools/llvm-cov/Inputs/test_file_checksum_fail.gcda
new file mode 100644
index 0000000..8bfd82c
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_file_checksum_fail.gcda
Binary files differ
diff --git a/test/tools/llvm-cov/Inputs/test_func_checksum_fail.gcda b/test/tools/llvm-cov/Inputs/test_func_checksum_fail.gcda
new file mode 100644
index 0000000..4c729a8
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_func_checksum_fail.gcda
Binary files differ
diff --git a/test/tools/llvm-cov/Inputs/test_no_gcda.cpp.gcov b/test/tools/llvm-cov/Inputs/test_no_gcda.cpp.gcov
new file mode 100644
index 0000000..31353ca
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_no_gcda.cpp.gcov
@@ -0,0 +1,79 @@
+        -:    0:Source:test.cpp
+        -:    0:Graph:test.gcno
+        -:    0:Data:-
+        -:    0:Runs:0
+        -:    0:Programs:0
+        -:    1:#include "test.h"
+        -:    2:#include <cstdlib>
+        -:    3:
+        -:    4:bool on = false;
+        -:    5:int len = 42;
+        -:    6:double grid[10][10] = {0};
+        -:    7:const char * hello = "world";
+        -:    8:const char * world = "hello";
+        -:    9:
+    #####:   10:void A::B() {}
+        -:   11:
+    #####:   12:void useless() {}
+        -:   13:
+        -:   14:double more_useless() {
+    #####:   15:  return 0;
+        -:   16:}
+        -:   17:
+        -:   18:int foo() {
+    #####:   19:  on = true;
+    #####:   20:  return 3;
+        -:   21:}
+        -:   22:
+        -:   23:int bar() {
+    #####:   24:  len--;
+    #####:   25:  return foo() + 45;
+        -:   26:}
+        -:   27:
+    #####:   28:void assign(int ii, int jj) {
+    #####:   29:  grid[ii][jj] = (ii+1) * (jj+1);
+    #####:   30:}
+        -:   31:
+        -:   32:void initialize_grid() {
+    #####:   33:  for (int ii = 0; ii < 2; ii++)
+    #####:   34:    for (int jj = 0; jj < 2; jj++)
+    #####:   35:      assign(ii, jj);
+    #####:   36:}
+        -:   37:
+        -:   38:int main() {
+    #####:   39:  initialize_grid();
+        -:   40:
+    #####:   41:  int a = 2;
+    #####:   42:  on = rand() % 2;
+    #####:   43:  if (on) {
+    #####:   44:    foo();
+    #####:   45:    ++a;
+    #####:   46:  } else {
+    #####:   47:    bar();
+    #####:   48:    a += rand();
+        -:   49:  }
+        -:   50:
+    #####:   51:  for (int ii = 0; ii < 10; ++ii) {
+    #####:   52:    switch (rand() % 5) {
+        -:   53:      case 0:
+    #####:   54:        a += rand();
+    #####:   55:        break;
+        -:   56:      case 1:
+        -:   57:      case 2:
+    #####:   58:        a += rand() / rand();
+    #####:   59:        break;
+        -:   60:      case 3:
+    #####:   61:        a -= rand();
+    #####:   62:        break;
+        -:   63:      default:
+    #####:   64:        a = -1;
+    #####:   65:    }
+    #####:   66:  }
+        -:   67:
+    #####:   68:  A thing;
+    #####:   69:  for (uint64_t ii = 0; ii < 4294967296; ++ii)
+    #####:   70:    thing.B();
+        -:   71:
+    #####:   72:  return a + 8 + grid[2][3] + len;
+        -:   73:  return more_useless();
+        -:   74:}
diff --git a/test/tools/llvm-cov/Inputs/test_no_gcda.h.gcov b/test/tools/llvm-cov/Inputs/test_no_gcda.h.gcov
new file mode 100644
index 0000000..c0a45c6
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_no_gcda.h.gcov
@@ -0,0 +1,8 @@
+        -:    0:Source:./test.h
+        -:    0:Graph:test.gcno
+        -:    0:Data:-
+        -:    0:Runs:0
+        -:    0:Programs:0
+    #####:    1:struct A {
+        -:    2:  virtual void B();
+        -:    3:};
diff --git a/test/tools/llvm-cov/Inputs/test_no_gcda.output b/test/tools/llvm-cov/Inputs/test_no_gcda.output
new file mode 100644
index 0000000..e994be7
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_no_gcda.output
@@ -0,0 +1,8 @@
+File 'test.cpp'
+Lines executed:0.00% of 38
+test.cpp:creating 'test.cpp.gcov'
+
+File './test.h'
+Lines executed:0.00% of 1
+./test.h:creating 'test.h.gcov'
+
diff --git a/test/tools/llvm-cov/Inputs/test_no_options.cpp.gcov b/test/tools/llvm-cov/Inputs/test_no_options.cpp.gcov
new file mode 100644
index 0000000..871e3ba
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_no_options.cpp.gcov
@@ -0,0 +1,79 @@
+        -:    0:Source:test.cpp
+        -:    0:Graph:test.gcno
+        -:    0:Data:test.gcda
+        -:    0:Runs:2
+        -:    0:Programs:1
+        -:    1:#include "test.h"
+        -:    2:#include <cstdlib>
+        -:    3:
+        -:    4:bool on = false;
+        -:    5:int len = 42;
+        -:    6:double grid[10][10] = {0};
+        -:    7:const char * hello = "world";
+        -:    8:const char * world = "hello";
+        -:    9:
+8589934592:   10:void A::B() {}
+        -:   11:
+    #####:   12:void useless() {}
+        -:   13:
+        -:   14:double more_useless() {
+    #####:   15:  return 0;
+        -:   16:}
+        -:   17:
+        -:   18:int foo() {
+        2:   19:  on = true;
+        2:   20:  return 3;
+        -:   21:}
+        -:   22:
+        -:   23:int bar() {
+    #####:   24:  len--;
+    #####:   25:  return foo() + 45;
+        -:   26:}
+        -:   27:
+        8:   28:void assign(int ii, int jj) {
+        8:   29:  grid[ii][jj] = (ii+1) * (jj+1);
+        8:   30:}
+        -:   31:
+        -:   32:void initialize_grid() {
+       12:   33:  for (int ii = 0; ii < 2; ii++)
+       24:   34:    for (int jj = 0; jj < 2; jj++)
+       12:   35:      assign(ii, jj);
+        2:   36:}
+        -:   37:
+        -:   38:int main() {
+        2:   39:  initialize_grid();
+        -:   40:
+        2:   41:  int a = 2;
+        2:   42:  on = rand() % 2;
+        2:   43:  if (on) {
+        2:   44:    foo();
+        2:   45:    ++a;
+        2:   46:  } else {
+    #####:   47:    bar();
+    #####:   48:    a += rand();
+        -:   49:  }
+        -:   50:
+       44:   51:  for (int ii = 0; ii < 10; ++ii) {
+       20:   52:    switch (rand() % 5) {
+        -:   53:      case 0:
+        4:   54:        a += rand();
+        4:   55:        break;
+        -:   56:      case 1:
+        -:   57:      case 2:
+        2:   58:        a += rand() / rand();
+        2:   59:        break;
+        -:   60:      case 3:
+        6:   61:        a -= rand();
+        6:   62:        break;
+        -:   63:      default:
+        8:   64:        a = -1;
+        8:   65:    }
+       20:   66:  }
+        -:   67:
+        2:   68:  A thing;
+17179869188:   69:  for (uint64_t ii = 0; ii < 4294967296; ++ii)
+8589934592:   70:    thing.B();
+        -:   71:
+        2:   72:  return a + 8 + grid[2][3] + len;
+        -:   73:  return more_useless();
+        -:   74:}
diff --git a/test/tools/llvm-cov/Inputs/test_no_options.h.gcov b/test/tools/llvm-cov/Inputs/test_no_options.h.gcov
new file mode 100644
index 0000000..4ba58c9
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_no_options.h.gcov
@@ -0,0 +1,8 @@
+        -:    0:Source:./test.h
+        -:    0:Graph:test.gcno
+        -:    0:Data:test.gcda
+        -:    0:Runs:2
+        -:    0:Programs:1
+        4:    1:struct A {
+        -:    2:  virtual void B();
+        -:    3:};
diff --git a/test/tools/llvm-cov/Inputs/test_no_options.output b/test/tools/llvm-cov/Inputs/test_no_options.output
new file mode 100644
index 0000000..8be8c1c
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_no_options.output
@@ -0,0 +1,8 @@
+File 'test.cpp'
+Lines executed:84.21% of 38
+test.cpp:creating 'test.cpp.gcov'
+
+File './test.h'
+Lines executed:100.00% of 1
+./test.h:creating 'test.h.gcov'
+
diff --git a/test/tools/llvm-cov/Inputs/test_no_preserve_paths.output b/test/tools/llvm-cov/Inputs/test_no_preserve_paths.output
new file mode 100644
index 0000000..ada0c36
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_no_preserve_paths.output
@@ -0,0 +1,8 @@
+File 'srcdir/./nested_dir/../test.h'
+Lines executed:100.00% of 1
+srcdir/./nested_dir/../test.h:creating 'test.h.gcov'
+
+File 'srcdir/./nested_dir/../test.cpp'
+Lines executed:84.21% of 38
+srcdir/./nested_dir/../test.cpp:creating 'test.cpp.gcov'
+
diff --git a/test/tools/llvm-cov/Inputs/test_objdir.cpp.gcov b/test/tools/llvm-cov/Inputs/test_objdir.cpp.gcov
new file mode 100644
index 0000000..abf8856
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_objdir.cpp.gcov
@@ -0,0 +1,79 @@
+        -:    0:Source:test.cpp
+        -:    0:Graph:objdir/test.gcno
+        -:    0:Data:objdir/test.gcda
+        -:    0:Runs:2
+        -:    0:Programs:1
+        -:    1:#include "test.h"
+        -:    2:#include <cstdlib>
+        -:    3:
+        -:    4:bool on = false;
+        -:    5:int len = 42;
+        -:    6:double grid[10][10] = {0};
+        -:    7:const char * hello = "world";
+        -:    8:const char * world = "hello";
+        -:    9:
+8589934592:   10:void A::B() {}
+        -:   11:
+    #####:   12:void useless() {}
+        -:   13:
+        -:   14:double more_useless() {
+    #####:   15:  return 0;
+        -:   16:}
+        -:   17:
+        -:   18:int foo() {
+        2:   19:  on = true;
+        2:   20:  return 3;
+        -:   21:}
+        -:   22:
+        -:   23:int bar() {
+    #####:   24:  len--;
+    #####:   25:  return foo() + 45;
+        -:   26:}
+        -:   27:
+        8:   28:void assign(int ii, int jj) {
+        8:   29:  grid[ii][jj] = (ii+1) * (jj+1);
+        8:   30:}
+        -:   31:
+        -:   32:void initialize_grid() {
+       12:   33:  for (int ii = 0; ii < 2; ii++)
+       24:   34:    for (int jj = 0; jj < 2; jj++)
+       12:   35:      assign(ii, jj);
+        2:   36:}
+        -:   37:
+        -:   38:int main() {
+        2:   39:  initialize_grid();
+        -:   40:
+        2:   41:  int a = 2;
+        2:   42:  on = rand() % 2;
+        2:   43:  if (on) {
+        2:   44:    foo();
+        2:   45:    ++a;
+        2:   46:  } else {
+    #####:   47:    bar();
+    #####:   48:    a += rand();
+        -:   49:  }
+        -:   50:
+       44:   51:  for (int ii = 0; ii < 10; ++ii) {
+       20:   52:    switch (rand() % 5) {
+        -:   53:      case 0:
+        4:   54:        a += rand();
+        4:   55:        break;
+        -:   56:      case 1:
+        -:   57:      case 2:
+        2:   58:        a += rand() / rand();
+        2:   59:        break;
+        -:   60:      case 3:
+        6:   61:        a -= rand();
+        6:   62:        break;
+        -:   63:      default:
+        8:   64:        a = -1;
+        8:   65:    }
+       20:   66:  }
+        -:   67:
+        2:   68:  A thing;
+17179869188:   69:  for (uint64_t ii = 0; ii < 4294967296; ++ii)
+8589934592:   70:    thing.B();
+        -:   71:
+        2:   72:  return a + 8 + grid[2][3] + len;
+        -:   73:  return more_useless();
+        -:   74:}
diff --git a/test/tools/llvm-cov/Inputs/test_objdir.h.gcov b/test/tools/llvm-cov/Inputs/test_objdir.h.gcov
new file mode 100644
index 0000000..8208d25
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_objdir.h.gcov
@@ -0,0 +1,8 @@
+        -:    0:Source:./test.h
+        -:    0:Graph:objdir/test.gcno
+        -:    0:Data:objdir/test.gcda
+        -:    0:Runs:2
+        -:    0:Programs:1
+        4:    1:struct A {
+        -:    2:  virtual void B();
+        -:    3:};
diff --git a/test/tools/llvm-cov/Inputs/test_paths.cpp.gcov b/test/tools/llvm-cov/Inputs/test_paths.cpp.gcov
new file mode 100644
index 0000000..3982ddf
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_paths.cpp.gcov
@@ -0,0 +1,79 @@
+        -:    0:Source:srcdir/./nested_dir/../test.cpp
+        -:    0:Graph:test_paths.gcno
+        -:    0:Data:test_paths.gcda
+        -:    0:Runs:3
+        -:    0:Programs:1
+        -:    1:#include "test.h"
+        -:    2:#include <cstdlib>
+        -:    3:
+        -:    4:bool on = false;
+        -:    5:int len = 42;
+        -:    6:double grid[10][10] = {0};
+        -:    7:const char * hello = "world";
+        -:    8:const char * world = "hello";
+        -:    9:
+12884901888:   10:void A::B() {}
+        -:   11:
+    #####:   12:void useless() {}
+        -:   13:
+        -:   14:double more_useless() {
+    #####:   15:  return 0;
+        -:   16:}
+        -:   17:
+        -:   18:int foo() {
+        3:   19:  on = true;
+        3:   20:  return 3;
+        -:   21:}
+        -:   22:
+        -:   23:int bar() {
+    #####:   24:  len--;
+    #####:   25:  return foo() + 45;
+        -:   26:}
+        -:   27:
+       12:   28:void assign(int ii, int jj) {
+       12:   29:  grid[ii][jj] = (ii+1) * (jj+1);
+       12:   30:}
+        -:   31:
+        -:   32:void initialize_grid() {
+       21:   33:  for (int ii = 0; ii < 2; ii++)
+       36:   34:    for (int jj = 0; jj < 2; jj++)
+       18:   35:      assign(ii, jj);
+        3:   36:}
+        -:   37:
+        -:   38:int main() {
+        3:   39:  initialize_grid();
+        -:   40:
+        3:   41:  int a = 2;
+        3:   42:  on = rand() % 2;
+        3:   43:  if (on) {
+        3:   44:    foo();
+        3:   45:    ++a;
+        3:   46:  } else {
+    #####:   47:    bar();
+    #####:   48:    a += rand();
+        -:   49:  }
+        -:   50:
+       66:   51:  for (int ii = 0; ii < 10; ++ii) {
+       30:   52:    switch (rand() % 5) {
+        -:   53:      case 0:
+        6:   54:        a += rand();
+        6:   55:        break;
+        -:   56:      case 1:
+        -:   57:      case 2:
+        3:   58:        a += rand() / rand();
+        3:   59:        break;
+        -:   60:      case 3:
+        9:   61:        a -= rand();
+        9:   62:        break;
+        -:   63:      default:
+       12:   64:        a = -1;
+       12:   65:    }
+       30:   66:  }
+        -:   67:
+        3:   68:  A thing;
+25769803782:   69:  for (uint64_t ii = 0; ii < 4294967296; ++ii)
+12884901888:   70:    thing.B();
+        -:   71:
+        3:   72:  return a + 8 + grid[2][3] + len;
+        -:   73:  return more_useless();
+        -:   74:}
diff --git a/test/tools/llvm-cov/Inputs/test_paths.gcda b/test/tools/llvm-cov/Inputs/test_paths.gcda
new file mode 100644
index 0000000..7e2cf9e
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_paths.gcda
Binary files differ
diff --git a/test/tools/llvm-cov/Inputs/test_paths.gcno b/test/tools/llvm-cov/Inputs/test_paths.gcno
new file mode 100644
index 0000000..aada974
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_paths.gcno
Binary files differ
diff --git a/test/tools/llvm-cov/Inputs/test_paths.h.gcov b/test/tools/llvm-cov/Inputs/test_paths.h.gcov
new file mode 100644
index 0000000..95e90ca
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_paths.h.gcov
@@ -0,0 +1,8 @@
+        -:    0:Source:srcdir/./nested_dir/../test.h
+        -:    0:Graph:test_paths.gcno
+        -:    0:Data:test_paths.gcda
+        -:    0:Runs:3
+        -:    0:Programs:1
+        6:    1:struct A {
+        -:    2:  virtual void B();
+        -:    3:};
diff --git a/test/tools/llvm-cov/Inputs/test_preserve_paths.output b/test/tools/llvm-cov/Inputs/test_preserve_paths.output
new file mode 100644
index 0000000..5331972
--- /dev/null
+++ b/test/tools/llvm-cov/Inputs/test_preserve_paths.output
@@ -0,0 +1,8 @@
+File 'srcdir/./nested_dir/../test.h'
+Lines executed:100.00% of 1
+srcdir/./nested_dir/../test.h:creating 'srcdir#nested_dir#^#test.h.gcov'
+
+File 'srcdir/./nested_dir/../test.cpp'
+Lines executed:84.21% of 38
+srcdir/./nested_dir/../test.cpp:creating 'srcdir#nested_dir#^#test.cpp.gcov'
+
diff --git a/test/tools/llvm-cov/Inputs/test_read_fail.gcno b/test/tools/llvm-cov/Inputs/test_read_fail.gcno
index 63b5d71..88073f1 100644
--- a/test/tools/llvm-cov/Inputs/test_read_fail.gcno
+++ b/test/tools/llvm-cov/Inputs/test_read_fail.gcno
Binary files differ
diff --git a/test/tools/llvm-cov/copy_block_helper.m b/test/tools/llvm-cov/copy_block_helper.m
new file mode 100644
index 0000000..1859b88
--- /dev/null
+++ b/test/tools/llvm-cov/copy_block_helper.m
@@ -0,0 +1,32 @@
+// Make sure that compiler-added functions (whose line number is zero) don't
+// crash llvm-cov.
+
+// We need shell for cd
+// REQUIRES: shell
+
+// RUN: rm -rf %t
+// RUN: mkdir %t
+// RUN: cd %t
+// RUN: cp %s %p/Inputs/copy_block_helper.gc* .
+
+// RUN: llvm-cov copy_block_helper.m | FileCheck %s --check-prefix=STDOUT
+// STDOUT: File 'copy_block_helper.m'
+// STDOUT: Lines executed:100.00% of 5
+// STDOUT: copy_block_helper.m:creating 'copy_block_helper.m.gcov'
+
+// RUN: FileCheck %s --check-prefix=GCOV < %t/copy_block_helper.m.gcov
+// GCOV: -:    0:Runs:1
+// GCOV: -:    0:Programs:1
+
+id test_helper(id (^foo)(void)) { return foo(); } // GCOV: 1:    [[@LINE]]:id
+void test(id x) { // GCOV: -:    [[@LINE]]:void test
+  test_helper(^{  // GCOV: 2:    [[@LINE]]:  test_helper
+    return x;     // GCOV: 1:    [[@LINE]]:    return
+  });             // GCOV: -:    [[@LINE]]:
+}                 // GCOV: 1:    [[@LINE]]:}
+
+// GCOV: 1:    [[@LINE+1]]:int main
+int main(int argc, const char *argv[]) { test(0); }
+
+// llvm-cov doesn't work on big endian yet
+// XFAIL: powerpc64, s390x, mips-, mips64-, sparc
diff --git a/test/tools/llvm-cov/lit.local.cfg b/test/tools/llvm-cov/lit.local.cfg
index df9b335..f738810 100644
--- a/test/tools/llvm-cov/lit.local.cfg
+++ b/test/tools/llvm-cov/lit.local.cfg
@@ -1 +1 @@
-config.suffixes = ['.test']
+config.suffixes = ['.test', '.m']
diff --git a/test/tools/llvm-cov/llvm-cov.test b/test/tools/llvm-cov/llvm-cov.test
index 28738a7..19d3e5d 100644
--- a/test/tools/llvm-cov/llvm-cov.test
+++ b/test/tools/llvm-cov/llvm-cov.test
@@ -1,10 +1,94 @@
-RUN: cd %p/Inputs
-# "cd" is unsupported in lit internal runner.
+# Tests for compatibility between llvm-cov and gcov. These work by
+# comparing llvm-cov against reference outputs generated by gcov 4.2.
+
+# "cd" and globbing are unsupported in lit internal runner.
 REQUIRES: shell
 
-RUN: llvm-cov -gcno=test.gcno -gcda=test.gcda \
-RUN:   | diff -aub test.cpp.gcov -
+RUN: rm -rf %t
+RUN: mkdir %t
+RUN: cd %t
+RUN: cp %p/Inputs/test* .
 
-RUN: not llvm-cov -gcno=test_read_fail.gcno -gcda=test.gcda
+# Basic behaviour with no flags
+RUN: llvm-cov test.c | diff -u test_no_options.output -
+RUN: diff -aub test_no_options.cpp.gcov test.cpp.gcov
+RUN: diff -aub test_no_options.h.gcov test.h.gcov
 
-XFAIL: powerpc64, s390x
+# Same, but specifying the object directory
+RUN: mkdir -p %t/objdir
+RUN: cp test.gcno test.gcda %t/objdir
+RUN: llvm-cov -o objdir test.c | diff -u test_no_options.output -
+RUN: diff -aub test_objdir.cpp.gcov test.cpp.gcov
+RUN: diff -aub test_objdir.h.gcov test.h.gcov
+
+# Specifying an object file
+RUN: llvm-cov -o objdir/test.o test.c | diff -u test_no_options.output -
+RUN: diff -aub test_objdir.cpp.gcov test.cpp.gcov
+RUN: diff -aub test_objdir.h.gcov test.h.gcov
+
+# Specifying an object file that could be ambiguous with a directory
+RUN: llvm-cov -o objdir/test test.c | diff -u test_no_options.output -
+RUN: diff -aub test_objdir.cpp.gcov test.cpp.gcov
+RUN: diff -aub test_objdir.h.gcov test.h.gcov
+
+# Preserve paths. This mangles the output filenames.
+RUN: mkdir -p %t/srcdir/nested_dir
+RUN: cp test.cpp test.h %t/srcdir
+RUN: llvm-cov -p test_paths.cpp | diff -u test_preserve_paths.output -
+RUN: diff -aub test_paths.cpp.gcov srcdir#nested_dir#^#test.cpp.gcov
+RUN: diff -aub test_paths.h.gcov srcdir#nested_dir#^#test.h.gcov
+
+# Don't preserve paths. Same results as preserve paths, but no mangling.
+RUN: llvm-cov test_paths.cpp | diff -u test_no_preserve_paths.output -
+RUN: diff -aub test_paths.cpp.gcov test.cpp.gcov
+RUN: diff -aub test_paths.h.gcov test.h.gcov
+
+# Function summaries. This changes stdout, but not the gcov files.
+RUN: llvm-cov test.c -f | diff -u test_-f.output -
+RUN: diff -aub test_no_options.cpp.gcov test.cpp.gcov
+RUN: diff -aub test_no_options.h.gcov test.h.gcov
+
+# All blocks. This doesn't affect stdout, only the gcov files.
+RUN: llvm-cov test.c -a | diff -u test_no_options.output -
+RUN: diff -aub test_-a.cpp.gcov test.cpp.gcov
+RUN: diff -aub test_-a.h.gcov test.h.gcov
+
+# Branch probabilities.
+RUN: llvm-cov test.c -a -b | diff -u test_-b.output -
+RUN: diff -aub test_-a_-b.cpp.gcov test.cpp.gcov
+RUN: diff -aub test_-a_-b.h.gcov test.h.gcov
+
+# Function summaries including branch probabilities.
+
+# FIXME: We don't correctly handle calls when -b and -f are used
+# together, so our output differs from gcov. Remove the 'not' from
+# this test once this is fixed.
+RUN: llvm-cov test.c -a -b -f | not diff -u test_-b_-f.output - >/dev/null
+RUN: diff -aub test_-a_-b.cpp.gcov test.cpp.gcov
+RUN: diff -aub test_-a_-b.h.gcov test.h.gcov
+
+# Summarize unconditional branches too.
+RUN: llvm-cov test.c -a -b -u | diff -u test_-b.output -
+RUN: diff -aub test_-a_-b_-u.cpp.gcov test.cpp.gcov
+RUN: diff -aub test_-a_-b_-u.h.gcov test.h.gcov
+
+# Absolute counts for branches.
+RUN: llvm-cov test.c -a -b -c -u | diff -u test_-b.output -
+RUN: diff -aub test_-a_-b_-c_-u.cpp.gcov test.cpp.gcov
+RUN: diff -aub test_-a_-b_-c_-u.h.gcov test.h.gcov
+
+# Missing gcda file just gives 0 counts.
+RUN: llvm-cov test.c -gcda=no_such_gcda_file | diff -u test_no_gcda.output -
+RUN: diff -aub test_no_gcda.cpp.gcov test.cpp.gcov
+RUN: diff -aub test_no_gcda.h.gcov test.h.gcov
+
+# Invalid gcno file.
+RUN: not llvm-cov test.c -gcno=test_read_fail.gcno
+
+# Bad file checksum on gcda.
+RUN: not llvm-cov test.c -gcda=test_file_checksum_fail.gcda
+
+# Bad function checksum on gcda
+RUN: not llvm-cov test.c -gcda=test_func_checksum_fail.gcda
+
+XFAIL: powerpc64, s390x, mips-, mips64-, sparc