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DebugCounters: Add API for setting/unsetting programatically. 

This is required so we can re-set the counter state for verifiers,
etc.

llvm-svn: 298186
This commit is contained in:
Daniel Berlin 2017-03-18 15:41:13 +00:00
parent f1966cf646
commit 182771f620
1 changed files with 26 additions and 5 deletions
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31
llvm/include/llvm/Support/DebugCounter.h
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@ -7,12 +7,12 @@
//
//===----------------------------------------------------------------------===//
/// \file
/// \brief This file provides an implementation of debug counters. Debug counters
/// are a tool that let you narrow down a miscompilation to a specific thing
/// happening.
/// \brief This file provides an implementation of debug counters. Debug
/// counters are a tool that let you narrow down a miscompilation to a specific
/// thing happening.
///
/// To give a use case: Imagine you have a file, very large, and you
/// are trying to understand the minimal transformation that breaks it. Bugpoint
/// are trying to understand the minimal transformation that breaks it. Bugpoint
/// and bisection is often helpful here in narrowing it down to a specific pass,
/// but it's still a very large file, and a very complicated pass to try to
/// debug. That is where debug counting steps in. You can instrument the pass
@ -100,11 +100,32 @@ public:
#endif // NDEBUG
}
// Return true if a given counter had values set (either programatically or on
// the command line). This will return true even if those values are
// currently in a state where the counter will always execute.
static bool isCounterSet(unsigned ID) {
return instance().Counters.count(ID);
}
// Return the skip and count for a counter. This only works for set counters.
static std::pair<int, int> getCounterValue(unsigned ID) {
auto &Us = instance();
auto Result = Us.Counters.find(ID);
assert(Result != Us.Counters.end() && "Asking about a non-set counter");
return Result->second;
}
// Set a registered counter to a given value.
static void setCounterValue(unsigned ID, const std::pair<int, int> &Val) {
auto &Us = instance();
Us.Counters[ID] = Val;
}
// Dump or print the current counter set.
LLVM_DUMP_METHOD void dump() { print(dbgs()); }
void print(raw_ostream &OS);
// Get the counter ID for a given named counter, or return 0 if none is found.
unsigned getCounterId(const std::string &Name) const {
return RegisteredCounters.idFor(Name);