From a6469e901a5073bad63ef514ebc5d1dab75d6e21 Mon Sep 17 00:00:00 2001 From: Ali Ijaz Sheikh Date: Sun, 25 Oct 2015 17:19:58 -0700 Subject: [PATCH] deps: backport 010897c from V8 upstream This is a reland of https://github.com/nodejs/node/pull/3165. The patch abates the truncation of script filenames in the perf-event output produced by V8. V8 commits: Original: https://github.com/v8/v8/commit/03ef3cd004c2fd31ae7e48772f106df67b8c2feb Reland: https://github.com/v8/v8/commit/010897c16adb46d3fe403eab525502a63e174b0c Original commit message: improve perf_basic_prof filename reporting The buffer used for appending filenames to the string printed to the perf_basic_prof log was unnecessarily too small. Bump it up to be at least kUtf8BufferSize. Truncation of filenames makes it really hard to work with profiles gathered on Node.js. Because of the way Node.js works, you can have node module dependencies in deeply nested directories. The last thing you want when investigating a performance problem is to have script names be truncated. This patch is a stop-gap. Ideally, I want no truncation of the filename at all and use a dynamically growing buffer. That would be a larger change, and I wanted to have a quick fix available that can be back-ported to Node.js LTS release. R=yangguo@chromium.org,yurys@chromium.org BUG= Review URL: https://codereview.chromium.org/1388543002 PR-URL: https://github.com/nodejs/node/pull/3520 Reviewed-By: bnoordhuis - Ben Noordhuis --- deps/v8/src/log.cc | 12 +++++---- deps/v8/test/cctest/test-log.cc | 55 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 62 insertions(+), 5 deletions(-) diff --git a/deps/v8/src/log.cc b/deps/v8/src/log.cc index 8f47e81..d584259 100644 --- a/deps/v8/src/log.cc +++ b/deps/v8/src/log.cc @@ -125,8 +125,9 @@ class CodeEventLogger::NameBuffer { } void AppendInt(int n) { - Vector buffer(utf8_buffer_ + utf8_pos_, - kUtf8BufferSize - utf8_pos_); + int space = kUtf8BufferSize - utf8_pos_; + if (space <= 0) return; + Vector buffer(utf8_buffer_ + utf8_pos_, space); int size = SNPrintF(buffer, "%d", n); if (size > 0 && utf8_pos_ + size <= kUtf8BufferSize) { utf8_pos_ += size; @@ -134,8 +135,9 @@ class CodeEventLogger::NameBuffer { } void AppendHex(uint32_t n) { - Vector buffer(utf8_buffer_ + utf8_pos_, - kUtf8BufferSize - utf8_pos_); + int space = kUtf8BufferSize - utf8_pos_; + if (space <= 0) return; + Vector buffer(utf8_buffer_ + utf8_pos_, space); int size = SNPrintF(buffer, "%x", n); if (size > 0 && utf8_pos_ + size <= kUtf8BufferSize) { utf8_pos_ += size; @@ -147,7 +149,7 @@ class CodeEventLogger::NameBuffer { private: static const int kUtf8BufferSize = 512; - static const int kUtf16BufferSize = 128; + static const int kUtf16BufferSize = kUtf8BufferSize; int utf8_pos_; char utf8_buffer_[kUtf8BufferSize]; diff --git a/deps/v8/test/cctest/test-log.cc b/deps/v8/test/cctest/test-log.cc index 0938a9e..daf2e68 100644 --- a/deps/v8/test/cctest/test-log.cc +++ b/deps/v8/test/cctest/test-log.cc @@ -531,3 +531,58 @@ TEST(LogVersion) { } isolate->Dispose(); } + + +// https://crbug.com/539892 +// CodeCreateEvents with really large names should not crash. +TEST(Issue539892) { + class : public i::CodeEventLogger { + public: + virtual void CodeMoveEvent(Address from, Address to) {} + virtual void CodeDeleteEvent(Address from) {} + virtual void CodeDisableOptEvent(i::Code* code, + i::SharedFunctionInfo* shared) {} + + private: + virtual void LogRecordedBuffer(i::Code* code, i::SharedFunctionInfo* shared, + const char* name, int length) {} + } code_event_logger; + SETUP_FLAGS(); + v8::Isolate::CreateParams create_params; + create_params.array_buffer_allocator = CcTest::array_buffer_allocator(); + v8::Isolate* isolate = v8::Isolate::New(create_params); + + { + ScopedLoggerInitializer initialize_logger(saved_log, saved_prof, isolate); + Logger* logger = initialize_logger.logger(); + logger->addCodeEventListener(&code_event_logger); + + // Function with a really large name. + const char* source_text = + "(function " + "baaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" + "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" + "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" + "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" + "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" + "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" + "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" + "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" + "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" + "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" + "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" + "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" + "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" + "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" + "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" + "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" + "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaac" + "(){})();"; + + CompileRun(source_text); + + // Must not crash. + logger->LogCompiledFunctions(); + } + isolate->Dispose(); +} -- 2.7.4