fix xdebug coverage (part1): xdebug_get_code_coverage return value …

…format for executed line

Summary:
This pull request is related to facebook#1589 .
(I will submit another pull request for supporting `XDEBUG_CC_UNUSED` and `XDEBUG_CC_DEAD_CODE` later)

`xdebug_get_code_coverage()` return value format is described in https://xdebug.org/docs/code_coverage :

> The returned values for each line are:
> * 1: this line was executed
> * -1: this line was not executed
> * -2: this line did not have executable code on it

According to this description, `xdebug_get_code_coverage()` should return value like:

```
[
    "/path/to/foo.php" => [
          3 => 1,  // executed line 3
          5 => 1,  // executed line 5
    ]
]
```

However, hhvm's `xdebug_get_code_coverage()` currently returns value like:

```
[
    "/path/to/foo.php" => [
          3 => 2,  // executed line 3 (2 times)
          5 => 3,  // executed line 5 (3 times)
    ]
]
```

In this pull request, hhvm's `xdebug_get_code_coverage()` return value format for executed line is changed to follow description in https://xdebug.org/docs/code_coverage .
Closes facebook#7888

Differential Revision: D5294692

Pulled By: mofarrell

fbshipit-source-id: c394e7b7b7c352edf66b2d6fa4895413b2005a35

hphp/runtime/base/code-coverage.h

@@ -28,6 +28,8 @@ namespace HPHP {
 struct Array;
 
 struct CodeCoverage {
+  static constexpr int kLineExecuted = 1;
+
   void Record(const char* filename, int line0, int line1);
 
   /*

hphp/runtime/ext/xdebug/ext_xdebug.cpp

@@ -467,10 +467,24 @@ static void HHVM_FUNCTION(xdebug_enable) {
 
 static Array HHVM_FUNCTION(xdebug_get_code_coverage) {
   auto ti = ThreadInfo::s_threadInfo.getNoCheck();
-  if (ti->m_reqInjectionData.getCoverage()) {
-    return ti->m_coverage->Report(false);
+  if (!ti->m_reqInjectionData.getCoverage()) {
+    return Array::Create();
+  }
+
+  auto ret = Array::Create();
+  auto const reports = ti->m_coverage->Report(false);
+  for (ArrayIter report(reports); report; ++report) {
+    auto tmp = Array::Create();
+    auto const lines = report.second().toArray();
+    for (ArrayIter line(lines); line; ++line) {
+      auto const count = line.second().toInt64();
+      if (count > 0) {
+        tmp.set(line.first(), Variant(CodeCoverage::kLineExecuted));
+      }
+    }
+    ret.set(report.first(), tmp);
   }
-  return Array::Create();
+  return ret;
 }
 
 // TODO(#3704) see xdebug_start_error_collection()

hphp/test/slow/ext_xdebug/code_coverage_started.php.expectf

@@ -6,7 +6,7 @@ array(1) {
     [5]=>
     int(1)
     [6]=>
-    int(3)
+    int(1)
     [8]=>
     int(1)
   }
@@ -19,9 +19,9 @@ array(1) {
     [11]=>
     int(1)
     [12]=>
-    int(3)
+    int(1)
     [14]=>
-    int(2)
+    int(1)
     [15]=>
     int(1)
   }
@@ -32,15 +32,15 @@ array(1) {
     [11]=>
     int(1)
     [12]=>
-    int(3)
+    int(1)
     [14]=>
-    int(2)
+    int(1)
     [15]=>
-    int(3)
+    int(1)
     [16]=>
-    int(2)
+    int(1)
     [17]=>
-    int(2)
+    int(1)
     [18]=>
     int(1)
   }

hphp/test/slow/ext_xdebug/get_code_coverage.php.expectf

@@ -20,21 +20,21 @@ array(1) {
     [2]=>
     int(1)
     [5]=>
-    int(32)
+    int(1)
     [6]=>
-    int(16)
+    int(1)
     [9]=>
-    int(36)
+    int(1)
     [10]=>
-    int(32)
+    int(1)
     [11]=>
-    int(18)
+    int(1)
     [12]=>
-    int(2)
+    int(1)
     [14]=>
-    int(2)
+    int(1)
     [15]=>
-    int(2)
+    int(1)
     [17]=>
     int(1)
   }

hphp/test/slow/ext_xdebug/xdebug/coverage.php.expectf

@@ -4,34 +4,34 @@ array(2) {
   ["%s/test/slow/ext_xdebug/xdebug/coverage.inc"]=>
   array(11) {
     [4]=>
-    int(%d)
+    int(1)
     [7]=>
-    int(%d)
+    int(1)
     [8]=>
     int(1)
     [10]=>
-    int(%d)
+    int(1)
     [11]=>
     int(1)
     [15]=>
-    int(2)
+    int(1)
     [17]=>
-    int(2)
+    int(1)
     [18]=>
-    int(2)
+    int(1)
     [20]=>
     int(1)
     [22]=>
-    int(4)
+    int(1)
     [23]=>
-    int(3)
+    int(1)
   }
   ["%s/test/slow/ext_xdebug/xdebug/coverage.php"]=>
   array(3) {
     [2]=>
     int(1)
     [3]=>
-    int(2)
+    int(1)
     [4]=>
     int(1)
   }