Make HPHP compiler version and compiler id accesible via ini_get()

Summary:
Pursuant to Task #489370, we need an easy way for PHP code to be able to
programmatically retrieve the HPHP compiler version (currently "1.000") and
the HPHP compiler id (a string providing the git revision and remote branch
that was used to build the compiler).

This diff updates ini_get() to support two new keys "hphp.compiler_version"
and "hphp.compiler_id" to give PHP code a way to programmatically access
the HPHP compiler version and HPHP compiler id.

Task ID: #489370

Blame Rev:

Reviewers: myang, qigao, mwilliams

CC: cbueno, jallen

Revert Plan:

Tags: hphp

- begin *PUBLIC* platform impact section -
Bugzilla: #
- end platform impact -

Differential Revision: 234008

src/hphp/main.cpp

@@ -364,15 +364,14 @@ int prepareOptions(ProgramOptions &po, int argc, char **argv) {
   }
   if (vm.count("version")) {
 #ifdef HPHP_VERSION
-#undefine HPHP_VERSION
+#undef HPHP_VERSION
 #endif
 #define HPHP_VERSION(v) cout << "HipHop Compiler v" #v << "\n";
 #include "../version"
 
 #ifdef COMPILER_ID
 cout << "Compiler: " << COMPILER_ID << "\n";
 #endif
-
     return 1;
   }
 

src/runtime/base/hphp_system.cpp

@@ -209,5 +209,21 @@ void Globals::fiberUnmarshal(Globals *src, FiberReferenceMap &refMap) {
   }
 }
 
+#ifdef HPHP_VERSION
+#undef HPHP_VERSION
+#endif
+#define HPHP_VERSION(v) return #v;
+const char* getHphpCompilerVersion() {
+#include "../../version"
+}
+
+const char* getHphpCompilerId() {
+#ifdef COMPILER_ID
+  return COMPILER_ID;
+#else
+  return "";
+#endif
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 }

src/runtime/base/hphp_system.h

@@ -102,6 +102,9 @@ class Globals : public LVariableTable {
   ssize_t wrapIter(ssize_t it) const;
 };
 
+const char* getHphpCompilerVersion();
+const char* getHphpCompilerId();
+
 ///////////////////////////////////////////////////////////////////////////////
 } // namespace HPHP
 

src/runtime/base/ini_setting.cpp

@@ -18,6 +18,7 @@
 #include <runtime/base/complex_types.h>
 #include <runtime/base/type_conversions.h>
 #include <runtime/base/builtin_functions.h>
+#include <runtime/base/hphp_system.h>
 #include <runtime/base/runtime_option.h>
 #include <runtime/base/timeout_thread.h>
 #include <runtime/ext/extension.h>
@@ -223,6 +224,14 @@ bool IniSetting::Get(CStrRef name, String &value) {
     value = String(RuntimeOption::BuildId);
     return true;
   }
+  if (name == "hphp.compiler_version") {
+    value = String(getHphpCompilerVersion());
+    return true;
+  }
+  if (name == "hphp.compiler_id") {
+    value = String(getHphpCompilerId());
+    return true;
+  }
   if (name == "arg_separator.output") {
     value = g_context->getArgSeparatorOutput();
     return true;