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[LTO] Support Statistics

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Summary:
I thought -Xlinker -mllvm -Xlinker -stats worked at some point but maybe
it never did.

For clang, I believe that stats are printed from cc1_main.  This patch
also prints them for LTO, specifically right after codegen happens.

I only looked at the C API for LTO briefly to see if this is a good
place.  Probably there are still cases where this wouldn't be printed
but it seems to be working for the common case.  I also experimented
putting this in the LTOCodeGenerator destructor but that didn't trigger
for me because ld64 does not destroy the LTOCodeGenerator.

Reviewers: dexonsmith, joker.eph

Subscribers: rafael, joker.eph, llvm-commits

Differential Revision: http://reviews.llvm.org/D17302

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@261013 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adam Nemet 2016-02-16 21:41:51 +00:00
parent 78eacd7a04
commit 6df4a6f175
2 changed files with 13 additions and 0 deletions
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5
lib/LTO/LTOCodeGenerator.cpp
View File

@ -13,6 +13,7 @@
//===----------------------------------------------------------------------===//
#include "llvm/LTO/LTOCodeGenerator.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
@ -553,6 +554,10 @@ bool LTOCodeGenerator::compileOptimized(ArrayRef<raw_pwrite_stream *> Out) {
RelocModel, CodeModel::Default, CGOptLevel, FileType,
ShouldRestoreGlobalsLinkage);
// If statistics were requested, print them out after codegen.
if (llvm::AreStatisticsEnabled())
llvm::PrintStatistics();
return true;
}

8
test/tools/lto/print-stats.ll Normal file
View File

@ -0,0 +1,8 @@
; RUN: llvm-as %s -o %t.o
; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -dylib -mllvm -stats -o %t.dylib %t.o 2>&1 | FileCheck --check-prefix=STATS %s
; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -arch x86_64 -dylib -o %t.dylib %t.o 2>&1 | FileCheck --check-prefix=NO_STATS %s
target triple = "x86_64-apple-macosx10.8.0"
; STATS: Statistics Collected
; NO_STATS-NOT: Statistics Collected