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[Support][CachePruning] Disable cache pruning regression fix

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borked by: rL284966 (see: https://reviews.llvm.org/D25730).

Previously, Interval was unsigned (see: CachePruning.h), replacing the type with std::chrono::seconds (which is signed) causes a regression in behaviour because the c-api intends negative values to translate to large positive intervals to *effectively* disable the pruning (see comments on: setCachePruningInterval()).

Differential Revision: https://reviews.llvm.org/D41231

llvm-svn: 321077
This commit is contained in:
Ben Dunbobbin 2017-12-19 14:42:38 +00:00
parent 8812d9dc72
commit 96703befd6
4 changed files with 32 additions and 6 deletions
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6
include/llvm/LTO/legacy/ThinLTOCodeGenerator.h
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@ -151,8 +151,12 @@ public:
/// Cache policy: interval (seconds) between two prune of the cache. Set to a
/// negative value (default) to disable pruning. A value of 0 will be ignored.
void setCachePruningInterval(int Interval) {
static_assert(std::is_same<decltype(CacheOptions.Policy.Interval),
std::chrono::seconds>::value,
"ensure same types to avoid risk of overflow");
if (Interval)
CacheOptions.Policy.Interval = std::chrono::seconds(Interval);
CacheOptions.Policy.Interval = Interval > 0 ? std::chrono::seconds(Interval)
: std::chrono::seconds::max();
}
/// Cache policy: expiration (in seconds) for an entry.

6
lib/Support/CachePruning.cpp
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@ -155,7 +155,8 @@ bool llvm::pruneCache(StringRef Path, CachePruningPolicy Policy) {
SmallString<128> TimestampFile(Path);
sys::path::append(TimestampFile, "llvmcache.timestamp");
sys::fs::file_status FileStatus;
const auto CurrentTime = system_clock::now();
const auto CurrentTime =
time_point_cast<decltype(Policy.Interval)>(system_clock::now());
if (auto EC = sys::fs::status(TimestampFile, FileStatus)) {
if (EC == errc::no_such_file_or_directory) {
// If the timestamp file wasn't there, create one now.
@ -168,7 +169,8 @@ bool llvm::pruneCache(StringRef Path, CachePruningPolicy Policy) {
if (Policy.Interval != seconds(0)) {
// Check whether the time stamp is older than our pruning interval.
// If not, do nothing.
const auto TimeStampModTime = FileStatus.getLastModificationTime();
const auto TimeStampModTime = time_point_cast<decltype(Policy.Interval)>(
FileStatus.getLastModificationTime());
auto TimeStampAge = CurrentTime - TimeStampModTime;
if (TimeStampAge <= Policy.Interval) {
DEBUG(dbgs() << "Timestamp file too recent ("

16
test/ThinLTO/X86/cache.ll
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@ -43,6 +43,22 @@
; RUN: ls %t.cache | count 2
; RUN: ls %t.cache/llvmcache-* | count 2
; Verify that caches with a timestamp older than the pruning interval
; will be pruned
; RUN: rm -Rf %t.cache && mkdir %t.cache
; RUN: touch -t 197001011200 %t.cache/llvmcache-foo
; RUN: touch -t 197001011200 %t.cache/llvmcache.timestamp
; RUN: llvm-lto -thinlto-action=run -exported-symbol=globalfunc %t2.bc %t.bc -thinlto-cache-dir %t.cache
; RUN: not ls %t.cache/llvmcache-foo
; Verify that specifying a negative number for the pruning interval
; effectively disables the pruning
; RUN: rm -Rf %t.cache && mkdir %t.cache
; RUN: touch -t 197001011200 %t.cache/llvmcache-foo
; RUN: touch -t 197001011200 %t.cache/llvmcache.timestamp
; RUN: llvm-lto -thinlto-action=run -exported-symbol=globalfunc %t2.bc %t.bc -thinlto-cache-dir %t.cache --thinlto-cache-pruning-interval -1
; RUN: ls %t.cache/llvmcache-foo
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.11.0"

4
tools/llvm-lto/llvm-lto.cpp
View File

@ -156,6 +156,9 @@ static cl::opt<std::string> ThinLTOModuleId(
static cl::opt<std::string>
ThinLTOCacheDir("thinlto-cache-dir", cl::desc("Enable ThinLTO caching."));
static cl::opt<int>
ThinLTOCachePruningInterval("thinlto-cache-pruning-interval", cl::desc("Set ThinLTO cache pruning interval."));
static cl::opt<std::string> ThinLTOSaveTempsPrefix(
"thinlto-save-temps",
cl::desc("Save ThinLTO temp files using filenames created by adding "
@ -470,6 +473,7 @@ public:
ThinGenerator.setCodePICModel(getRelocModel());
ThinGenerator.setTargetOptions(Options);
ThinGenerator.setCacheDir(ThinLTOCacheDir);
ThinGenerator.setCachePruningInterval(ThinLTOCachePruningInterval);
ThinGenerator.setFreestanding(EnableFreestanding);
// Add all the exported symbols to the table of symbols to preserve.