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[ThinLTO] Add an option to llvm-lto to print some basic statistics for the index

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Differential Revision: https://reviews.llvm.org/D24290

llvm-svn: 281537
This commit is contained in:
Mehdi Amini 2016-09-14 21:04:59 +00:00
parent 106c504026
commit 1c71f902d0
2 changed files with 47 additions and 0 deletions
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3
test/ThinLTO/X86/funcimport.ll
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@ -3,6 +3,9 @@
; RUN: opt -module-summary %p/Inputs/funcimport.ll -o %t2.bc
; RUN: llvm-lto -thinlto-action=thinlink -o %t3.bc %t.bc %t2.bc
; RUN: llvm-lto -thinlto-index-stats %t3.bc | FileCheck %s -check-prefix=STATS
; STATS: Index {{.*}} contains 24 nodes (13 functions, 3 alias, 8 globals) and 19 edges (8 refs and 11 calls)
; Ensure statics are promoted/renamed correctly from this file (all but
; constant variable need promotion).
; RUN: llvm-lto -thinlto-action=promote %t.bc -thinlto-index=%t3.bc -o - | llvm-dis -o - | FileCheck %s --check-prefix=EXPORTSTATIC

44
tools/llvm-lto/llvm-lto.cpp
View File

@ -42,6 +42,11 @@ static cl::opt<char>
"(default = '-O2')"),
cl::Prefix, cl::ZeroOrMore, cl::init('2'));
static cl::opt<bool>
IndexStats("thinlto-index-stats",
cl::desc("Print statistic for the index in every input files"),
cl::init(false));
static cl::opt<bool> DisableVerify(
"disable-verify", cl::init(false),
cl::desc("Do not run the verifier during the optimization pipeline"));
@ -264,6 +269,40 @@ getLocalLTOModule(StringRef Path, std::unique_ptr<MemoryBuffer> &Buffer,
return std::move(*Ret);
}
/// Print some statistics on the index for each input files.
void printIndexStats() {
for (auto &Filename : InputFilenames) {
CurrentActivity = "loading file '" + Filename + "'";
ErrorOr<std::unique_ptr<ModuleSummaryIndex>> IndexOrErr =
llvm::getModuleSummaryIndexForFile(Filename, diagnosticHandler);
error(IndexOrErr, "error " + CurrentActivity);
std::unique_ptr<ModuleSummaryIndex> Index = std::move(IndexOrErr.get());
CurrentActivity = "";
// Skip files without a module summary.
if (!Index)
report_fatal_error(Filename + " does not contain an index");
unsigned Calls = 0, Refs = 0, Functions = 0, Alias = 0, Globals = 0;
for (auto &Summaries : *Index) {
for (auto &Summary : Summaries.second) {
Refs += Summary->refs().size();
if (auto *FuncSummary = dyn_cast<FunctionSummary>(Summary.get())) {
Functions++;
Calls += FuncSummary->calls().size();
} else if (isa<AliasSummary>(Summary.get()))
Alias++;
else
Globals++;
}
}
outs() << "Index " << Filename << " contains "
<< (Alias + Globals + Functions) << " nodes (" << Functions
<< " functions, " << Alias << " alias, " << Globals
<< " globals) and " << (Calls + Refs) << " edges (" << Refs
<< " refs and " << Calls << " calls)\n";
}
}
/// \brief List symbols in each IR file.
///
/// The main point here is to provide lit-testable coverage for the LTOModule
@ -725,6 +764,11 @@ int main(int argc, char **argv) {
return 0;
}
if (IndexStats) {
printIndexStats();
return 0;
}
if (CheckHasObjC) {
for (auto &Filename : InputFilenames) {
ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr =