1 files changed, 136 insertions, 0 deletions
diff --git a/llvm/lib/Support/DebugCounter.cpp b/llvm/lib/Support/DebugCounter.cpp
new file mode 100644
index 000000000000..6598103658da
--- /dev/null
+++ b/llvm/lib/Support/DebugCounter.cpp
@@ -0,0 +1,136 @@
+#include "llvm/Support/DebugCounter.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/Options.h"
+
+using namespace llvm;
+
+namespace {
+// This class overrides the default list implementation of printing so we
+// can pretty print the list of debug counter options.  This type of
+// dynamic option is pretty rare (basically this and pass lists).
+class DebugCounterList : public cl::list<std::string, DebugCounter> {
+private:
+  using Base = cl::list<std::string, DebugCounter>;
+
+public:
+  template <class... Mods>
+  explicit DebugCounterList(Mods &&... Ms) : Base(std::forward<Mods>(Ms)...) {}
+
+private:
+  void printOptionInfo(size_t GlobalWidth) const override {
+    // This is a variant of from generic_parser_base::printOptionInfo.  Sadly,
+    // it's not easy to make it more usable.  We could get it to print these as
+    // options if we were a cl::opt and registered them, but lists don't have
+    // options, nor does the parser for std::string.  The other mechanisms for
+    // options are global and would pollute the global namespace with our
+    // counters.  Rather than go that route, we have just overridden the
+    // printing, which only a few things call anyway.
+    outs() << "  -" << ArgStr;
+    // All of the other options in CommandLine.cpp use ArgStr.size() + 6 for
+    // width, so we do the same.
+    Option::printHelpStr(HelpStr, GlobalWidth, ArgStr.size() + 6);
+    const auto &CounterInstance = DebugCounter::instance();
+    for (auto Name : CounterInstance) {
+      const auto Info =
+          CounterInstance.getCounterInfo(CounterInstance.getCounterId(Name));
+      size_t NumSpaces = GlobalWidth - Info.first.size() - 8;
+      outs() << "    =" << Info.first;
+      outs().indent(NumSpaces) << " -   " << Info.second << '\n';
+    }
+  }
+};
+} // namespace
+
+// Create our command line option.
+static DebugCounterList DebugCounterOption(
+    "debug-counter", cl::Hidden,
+    cl::desc("Comma separated list of debug counter skip and count"),
+    cl::CommaSeparated, cl::ZeroOrMore, cl::location(DebugCounter::instance()));
+
+static cl::opt<bool> PrintDebugCounter(
+    "print-debug-counter", cl::Hidden, cl::init(false), cl::Optional,
+    cl::desc("Print out debug counter info after all counters accumulated"));
+
+static ManagedStatic<DebugCounter> DC;
+
+// Print information when destroyed, iff command line option is specified.
+DebugCounter::~DebugCounter() {
+  if (isCountingEnabled() && PrintDebugCounter)
+    print(dbgs());
+}
+
+DebugCounter &DebugCounter::instance() { return *DC; }
+
+// This is called by the command line parser when it sees a value for the
+// debug-counter option defined above.
+void DebugCounter::push_back(const std::string &Val) {
+  if (Val.empty())
+    return;
+  // The strings should come in as counter=value
+  auto CounterPair = StringRef(Val).split('=');
+  if (CounterPair.second.empty()) {
+    errs() << "DebugCounter Error: " << Val << " does not have an = in it\n";
+    return;
+  }
+  // Now we have counter=value.
+  // First, process value.
+  int64_t CounterVal;
+  if (CounterPair.second.getAsInteger(0, CounterVal)) {
+    errs() << "DebugCounter Error: " << CounterPair.second
+           << " is not a number\n";
+    return;
+  }
+  // Now we need to see if this is the skip or the count, remove the suffix, and
+  // add it to the counter values.
+  if (CounterPair.first.endswith("-skip")) {
+    auto CounterName = CounterPair.first.drop_back(5);
+    unsigned CounterID = getCounterId(CounterName);
+    if (!CounterID) {
+      errs() << "DebugCounter Error: " << CounterName
+             << " is not a registered counter\n";
+      return;
+    }
+    enableAllCounters();
+
+    CounterInfo &Counter = Counters[CounterID];
+    Counter.Skip = CounterVal;
+    Counter.IsSet = true;
+  } else if (CounterPair.first.endswith("-count")) {
+    auto CounterName = CounterPair.first.drop_back(6);
+    unsigned CounterID = getCounterId(CounterName);
+    if (!CounterID) {
+      errs() << "DebugCounter Error: " << CounterName
+             << " is not a registered counter\n";
+      return;
+    }
+    enableAllCounters();
+
+    CounterInfo &Counter = Counters[CounterID];
+    Counter.StopAfter = CounterVal;
+    Counter.IsSet = true;
+  } else {
+    errs() << "DebugCounter Error: " << CounterPair.first
+           << " does not end with -skip or -count\n";
+  }
+}
+
+void DebugCounter::print(raw_ostream &OS) const {
+  SmallVector<StringRef, 16> CounterNames(RegisteredCounters.begin(),
+                                          RegisteredCounters.end());
+  sort(CounterNames.begin(), CounterNames.end());
+
+  auto &Us = instance();
+  OS << "Counters and values:\n";
+  for (auto &CounterName : CounterNames) {
+    unsigned CounterID = getCounterId(CounterName);
+    OS << left_justify(RegisteredCounters[CounterID], 32) << ": {"
+       << Us.Counters[CounterID].Count << "," << Us.Counters[CounterID].Skip
+       << "," << Us.Counters[CounterID].StopAfter << "}\n";
+  }
+}
+
+LLVM_DUMP_METHOD void DebugCounter::dump() const {
+  print(dbgs());
+}