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Add initial support for debug counting

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Summary:

We have support for bisection, and bugpoint can reduce testcases
often to a single pass. But that doesn't help reduce it to a single
transform by a single pass.  Which debug counting lets us do.

Debug counting lets you instrument a pass so that it only executes a
certain thing (rwhatever you want) after skipping it a certain time of
times, and then only does a certain number of executions before saying
"skip" again.

To make it concrete, for predicateinfo, if i instrument use renaming,
i can make it so it skips renaming the first N uses, renames the next
N, and then skips the rest.

This lets you narrow down a miscompilation to, often, a single
transformation, and then also debug it (by using the same command line
parameters).

Reviewers: chandlerc, davide, mehdi_amini

Subscribers: mgorny, llvm-commits

Differential Revision: https://reviews.llvm.org/D29998

llvm-svn: 295593
This commit is contained in:
Daniel Berlin 2017-02-19 04:28:56 +00:00
parent a8741d2ac3
commit 3a776413d0
3 changed files with 9 additions and 5 deletions
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3
include/llvm/Support/CommandLine.h
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@ -343,6 +343,9 @@ public:
virtual void printOptionValue(size_t GlobalWidth, bool Force) const = 0;
static void printHelpStr(StringRef HelpStr, size_t Indent,
size_t FirstLineIndentedBy);
virtual void getExtraOptionNames(SmallVectorImpl<StringRef> &) {}
// addOccurrence - Wrapper around handleOccurrence that enforces Flags.

1
lib/Support/CMakeLists.txt
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@ -47,6 +47,7 @@ add_llvm_library(LLVMSupport
CrashRecoveryContext.cpp
DataExtractor.cpp
Debug.cpp
DebugCounter.cpp
DeltaAlgorithm.cpp
DAGDeltaAlgorithm.cpp
Dwarf.cpp

10
lib/Support/CommandLine.cpp
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@ -1404,8 +1404,8 @@ static StringRef getValueStr(const Option &O, StringRef DefaultMsg) {
// Return the width of the option tag for printing...
size_t alias::getOptionWidth() const { return ArgStr.size() + 6; }
static void printHelpStr(StringRef HelpStr, size_t Indent,
size_t FirstLineIndentedBy) {
void Option::printHelpStr(StringRef HelpStr, size_t Indent,
size_t FirstLineIndentedBy) {
std::pair<StringRef, StringRef> Split = HelpStr.split('\n');
outs().indent(Indent - FirstLineIndentedBy) << " - " << Split.first << "\n";
while (!Split.second.empty()) {
@ -1448,7 +1448,7 @@ void basic_parser_impl::printOptionInfo(const Option &O,
if (!ValName.empty())
outs() << "=<" << getValueStr(O, ValName) << '>';
printHelpStr(O.HelpStr, GlobalWidth, getOptionWidth(O));
Option::printHelpStr(O.HelpStr, GlobalWidth, getOptionWidth(O));
}
void basic_parser_impl::printOptionName(const Option &O,
@ -1587,7 +1587,7 @@ void generic_parser_base::printOptionInfo(const Option &O,
size_t GlobalWidth) const {
if (O.hasArgStr()) {
outs() << " -" << O.ArgStr;
printHelpStr(O.HelpStr, GlobalWidth, O.ArgStr.size() + 6);
Option::printHelpStr(O.HelpStr, GlobalWidth, O.ArgStr.size() + 6);
for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
size_t NumSpaces = GlobalWidth - getOption(i).size() - 8;
@ -1600,7 +1600,7 @@ void generic_parser_base::printOptionInfo(const Option &O,
for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
auto Option = getOption(i);
outs() << " -" << Option;
printHelpStr(getDescription(i), GlobalWidth, Option.size() + 8);
Option::printHelpStr(getDescription(i), GlobalWidth, Option.size() + 8);
}
}
}