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Print out DebugCounter info with -print-debug-counter

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Summary:
This patch will print out {Counter, Skip, StopAfter} info of all passes which have DebugCounter set at destruction.

It can be used to monitor how many times does certain transformation happen in a pass, and also help check if -debug-counter option is set correctly.

Please refer to this [[ http://lists.llvm.org/pipermail/llvm-dev/2018-July/124722.html  | thread ]] for motivation.

Reviewers: george.burgess.iv, davide, greened

Reviewed By: greened

Subscribers: kristina, llozano, mgorny, llvm-commits, mgrang

Differential Revision: https://reviews.llvm.org/D50031

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@345085 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Zhizhou Yang 2018-10-23 21:51:56 +00:00
parent ed9fa1afb6
commit 1bbd49ae6f
3 changed files with 53 additions and 4 deletions
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2
include/llvm/Support/DebugCounter.h
View File

@ -55,6 +55,8 @@ namespace llvm {
class DebugCounter {
public:
~DebugCounter();
/// Returns a reference to the singleton instance.
static DebugCounter &instance();

25
lib/Support/DebugCounter.cpp
View File

@ -49,8 +49,18 @@ static DebugCounterList DebugCounterOption(
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
@ -107,11 +117,18 @@ void DebugCounter::push_back(const std::string &Val) {
}
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 (const auto &KV : Counters)
OS << left_justify(RegisteredCounters[KV.first], 32) << ": {"
<< KV.second.Count << "," << KV.second.Skip << ","
<< KV.second.StopAfter << "}\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 {

30
test/Other/print-debug-counter.ll Normal file
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@ -0,0 +1,30 @@
; RUN: opt -S -debug-counter=early-cse-skip=1,early-cse-count=1 -early-cse \
; RUN: -debug-counter=newgvn-vn-skip=1,newgvn-vn-count=2 -newgvn \
; RUN: -instcombine -print-debug-counter < %s 2>&1 | FileCheck %s
;; Test debug counter prints correct info in right order.
; CHECK-LABEL: Counters and values:
; CHECK: early-cse
; CHECK-SAME: {4,1,1}
; CHECK: instcombine-visit
; CHECK-SAME: {12,0,-1}
; CHECK: newgvn-vn
; CHECK-SAME: {9,1,2}
define i32 @f1(i32 %a, i32 %b) {
bb:
%add1 = add i32 %a, %b
%add2 = add i32 %a, %b
%add3 = add i32 %a, %b
%add4 = add i32 %a, %b
%ret1 = add i32 %add1, %add2
%ret2 = add i32 %add3, %add4
%ret = add i32 %ret1, %ret2
ret i32 %ret
}
define i32 @f2(i32 %a, i32 %b) {
bb:
%add1 = add i32 %a, %b
%add2 = add i32 %a, %b
%ret = add i32 %add1, %add2
ret i32 %ret
}