From eddac53ff60c579eff28134bde84783fe36d6214 Mon Sep 17 00:00:00 2001
From: Nathan Binkert <nate@binkert.org>
Date: Fri, 15 Apr 2011 10:44:32 -0700
Subject: trace: reimplement the DTRACE function so it doesn't use a vector At
 the same time, rename the trace flags to debug flags since they have broader
 usage than simply tracing.  This means that --trace-flags is now
 --debug-flags and --trace-help is now --debug-help

---
 src/base/debug.cc | 135 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)

(limited to 'src/base/debug.cc')

diff --git a/src/base/debug.cc b/src/base/debug.cc
index 6f01b3fc0..be301da07 100644
--- a/src/base/debug.cc
+++ b/src/base/debug.cc
@@ -31,12 +31,24 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#include <algorithm>
 #include <csignal>
+#include <map>
+#include <vector>
 
 #include "base/cprintf.hh"
+#include "base/debug.hh"
+#include "base/misc.hh"
+
+using namespace std;
 
 namespace Debug {
 
+//
+// This function will cause the process to signal itself with a
+// SIGTRAP which is ignored if not in gdb, but will cause the debugger
+// to break if in gdb.
+//
 void
 breakpoint()
 {
@@ -47,4 +59,127 @@ breakpoint()
 #endif
 }
 
+//
+// Flags for debugging purposes.  Primarily for trace.hh
+//
+typedef std::map<string, Flag *> FlagsMap;
+int allFlagsVersion = 0;
+FlagsMap &
+allFlags()
+{
+    static FlagsMap flags;
+    return flags;
+}
+
+Flag *
+findFlag(const std::string &name)
+{
+    FlagsMap::iterator i = allFlags().find(name);
+    if (i == allFlags().end())
+        return NULL;
+    return i->second;
+}
+
+Flag::Flag(const char *name, const char *desc)
+    : _name(name), _desc(desc)
+{
+    pair<FlagsMap::iterator, bool> result =
+        allFlags().insert(make_pair(name, this));
+
+    if (!result.second)
+        panic("Flag %s already defined!", name);
+
+    ++allFlagsVersion;
+}
+
+Flag::~Flag()
+{
+    // should find and remove flag.
+}
+
+void
+CompoundFlag::enable()
+{
+    SimpleFlag::enable();
+    for_each(flags.begin(), flags.end(), mem_fun(&Flag::enable));
+}
+
+void
+CompoundFlag::disable()
+{
+    SimpleFlag::disable();
+    for_each(flags.begin(), flags.end(), mem_fun(&Flag::disable));
+}
+
+struct AllFlags : public Flag
+{
+    AllFlags()
+        : Flag("All", "All Flags")
+    {}
+
+    void
+    enable()
+    {
+        FlagsMap::iterator i = allFlags().begin();
+        FlagsMap::iterator end = allFlags().end();
+        for (; i != end; ++i)
+            if (i->second != this)
+                i->second->enable();
+    }
+
+    void
+    disable()
+    {
+        FlagsMap::iterator i = allFlags().begin();
+        FlagsMap::iterator end = allFlags().end();
+        for (; i != end; ++i)
+            if (i->second != this)
+                i->second->enable();
+    }
+};
+
+AllFlags theAllFlags;
+Flag *const All = &theAllFlags;
+
+bool
+changeFlag(const char *s, bool value)
+{
+    Flag *f = findFlag(s);
+    if (!f)
+        return false;
+
+    if (value)
+        f->enable();
+    else
+        f->disable();
+
+    return true;
+}
+
 } // namespace Debug
+
+// add a set of functions that can easily be invoked from gdb
+void
+setDebugFlag(const char *string)
+{
+    Debug::changeFlag(string, true);
+}
+
+void
+clearDebugFlag(const char *string)
+{
+    Debug::changeFlag(string, false);
+}
+
+void
+dumpDebugFlags()
+{
+    using namespace Debug;
+    FlagsMap::iterator i = allFlags().begin();
+    FlagsMap::iterator end = allFlags().end();
+    for (; i != end; ++i) {
+        SimpleFlag *f = dynamic_cast<SimpleFlag *>(i->second);
+        if (f && f->status())
+            cprintf("%s\n", f->name());
+    }
+}
-- 
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