Use a CMake macro for speedup

Author: joker-eph

llvm/cmake/modules/LLVMProcessSources.cmake

@@ -58,6 +58,15 @@ function(llvm_process_sources OUT_VAR)
   set(sources ${ARG_UNPARSED_ARGUMENTS})
   llvm_check_source_file_list(${sources})
 
+  foreach(fn ${sources})
+    get_filename_component(suf ${fn} EXT)
+    if("${suf}" STREQUAL ".cpp" OR "${suf}" STREQUAL ".c")
+      get_filename_component(short_name ${fn} NAME)
+      set_source_files_properties(${fn} PROPERTIES COMPILE_DEFINITIONS "__SHORT_FILE__=\"${short_name}\"")
+    endif()
+  endforeach()
+
+
   # This adds .td and .h files to the Visual Studio solution:
   add_td_sources(sources)
   find_all_header_files(hdrs "${ARG_ADDITIONAL_HEADER_DIRS}")

llvm/include/llvm/Support/DebugLog.h

@@ -26,25 +26,27 @@ namespace llvm {
 //              << "] " << "Bitset contains: " << Bitset << "\n");
 #define LDBG() DEBUGLOG_WITH_STREAM_AND_TYPE(llvm::dbgs(), DEBUG_TYPE)
 
+#if defined(__SHORT_FILE__)
 #define DEBUGLOG_WITH_STREAM_AND_TYPE(STREAM, TYPE)                            \
   for (bool _c = (::llvm::DebugFlag && ::llvm::isCurrentDebugType(TYPE)); _c;  \
        _c = false)                                                             \
-  ::llvm::impl::LogWithNewline(                                                \
-      TYPE,                                                                    \
-      [] {                                                                     \
-        /* Force constexpr eval */                                             \
-        constexpr const char *filename =                                       \
-            ::llvm::impl::LogWithNewline::getFileName(__FILE__);               \
-        return filename;                                                       \
-      }(),                                                                     \
-      __LINE__, (STREAM))
+  ::llvm::impl::LogWithNewline(TYPE, __SHORT_FILE__, __LINE__, (STREAM))
+#else
+#define DEBUGLOG_WITH_STREAM_AND_TYPE(STREAM, TYPE)                            \
+  for (bool _c = (::llvm::DebugFlag && ::llvm::isCurrentDebugType(TYPE)); _c;  \
+       _c = false)                                                             \
+  ::llvm::impl::LogWithNewline(TYPE, __FILE__, __LINE__, (STREAM))
+#endif
 
 namespace impl {
 class LogWithNewline {
 public:
   LogWithNewline(const char *debug_type, const char *file, int line,
                  raw_ostream &os)
       : os(os) {
+#if !defined(__SHORT_FILE__)
+    file = ::llvm::impl::LogWithNewline::getShortFileName(file);
+#endif
     if (debug_type)
       os << "[" << debug_type << "] ";
     os << file << ":" << line << " ";
@@ -59,7 +61,7 @@ class LogWithNewline {
   LogWithNewline(const LogWithNewline &) = delete;
   LogWithNewline &operator=(const LogWithNewline &) = delete;
   LogWithNewline &operator=(LogWithNewline &&) = delete;
-  static constexpr const char *getFileName(const char *path) {
+  static constexpr const char *getShortFileName(const char *path) {
     // Remove the path prefix from the file name.
     const char *filename = path;
     for (const char *p = path; *p != '\0'; ++p) {