Integrate ETW with VLOG logging.

base/vlog.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/vlog.h"
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
 #include "base/string_split.h"
@@ skipping 11 matching lines @@
   std::string::size_type first_slash = pattern.find_first_of("\\/");
   if (first_slash != std::string::npos)
     match_target = MATCH_FILE;
 }
 
 VlogInfo::VmodulePattern::VmodulePattern()
     : vlog_level(VlogInfo::kDefaultVlogLevel),
       match_target(MATCH_MODULE) {}
 
 VlogInfo::VlogInfo(const std::string& v_switch,
-                   const std::string& vmodule_switch)
-    : max_vlog_level_(kDefaultVlogLevel) {
+                   const std::string& vmodule_switch,
+                   int* min_log_level)
+    : min_log_level_(min_log_level) {
+  DCHECK(min_log_level != NULL);
+
   typedef std::pair<std::string, std::string> KVPair;
-  if (!v_switch.empty() &&
-      !base::StringToInt(v_switch, &max_vlog_level_)) {
+  int vlog_level = 0;
+  if (base::StringToInt(v_switch, &vlog_level)) {
+    SetMaxVlogLevel(vlog_level);
+  } else {
     LOG(WARNING) << "Parsed v switch \""
-                 << v_switch << "\" as " << max_vlog_level_;
+                 << v_switch << "\" as " << vlog_level;
   }
+
   std::vector<KVPair> kv_pairs;
   if (!base::SplitStringIntoKeyValuePairs(
           vmodule_switch, '=', ',', &kv_pairs)) {
     LOG(WARNING) << "Could not fully parse vmodule switch \""
                  << vmodule_switch << "\"";
   }
   for (std::vector<KVPair>::const_iterator it = kv_pairs.begin();
        it != kv_pairs.end(); ++it) {
     VmodulePattern pattern(it->first);
     if (!base::StringToInt(it->second, &pattern.vlog_level)) {
       LOG(WARNING) << "Parsed vlog level for \""
                    << it->first << "=" << it->second
                    << "\" as " << pattern.vlog_level;
     }
     vmodule_levels_.push_back(pattern);
   }
 }
 
 VlogInfo::~VlogInfo() {}
 
+void VlogInfo::SetMaxVlogLevel(int level) {
+  // Log severity is the negative verbosity.
+  *min_log_level_ = -level;
+}
+
+int VlogInfo::GetMaxVlogLevel() const {
+  return -*min_log_level_;
+}
+
 namespace {
 
 // Given a path, returns the basename with the extension chopped off
 // (and any -inl suffix).  We avoid using FilePath to minimize the
 // number of dependencies the logging system has.
 base::StringPiece GetModule(const base::StringPiece& file) {
   base::StringPiece module(file);
   base::StringPiece::size_type last_slash_pos =
       module.find_last_of("\\/");
   if (last_slash_pos != base::StringPiece::npos)
     module.remove_prefix(last_slash_pos + 1);
   base::StringPiece::size_type extension_start = module.rfind('.');
   module = module.substr(0, extension_start);
   static const char kInlSuffix[] = "-inl";
   static const int kInlSuffixLen = arraysize(kInlSuffix) - 1;
   if (module.ends_with(kInlSuffix))
     module.remove_suffix(kInlSuffixLen);
   return module;
 }
 
 }  // namespace
 
-int VlogInfo::GetVlogLevel(const base::StringPiece& file) {
+int VlogInfo::GetVlogLevel(const base::StringPiece& file) const {
   if (!vmodule_levels_.empty()) {
     base::StringPiece module(GetModule(file));
     for (std::vector<VmodulePattern>::const_iterator it =
              vmodule_levels_.begin(); it != vmodule_levels_.end(); ++it) {
       base::StringPiece target(
           (it->match_target == VmodulePattern::MATCH_FILE) ? file : module);
       if (MatchVlogPattern(target, it->pattern))
         return it->vlog_level;
     }
   }
-  return max_vlog_level_;
+  return GetMaxVlogLevel();
 }
 
 bool MatchVlogPattern(const base::StringPiece& string,
                       const base::StringPiece& vlog_pattern) {
   base::StringPiece p(vlog_pattern);
   base::StringPiece s(string);
   // Consume characters until the next star.
   while (!p.empty() && !s.empty() && (p[0] != '*')) {
     switch (p[0]) {
       // A slash (forward or back) must match a slash (forward or back).
@@ skipping 36 matching lines @@
     if (MatchVlogPattern(s, p))
       return true;
     s.remove_prefix(1);
   }
 
   // Otherwise, we couldn't find a match.
   return false;
 }
 
 }  // namespace