--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/JavaScriptCore/bytecode/SamplingTool.cpp Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,406 @@
+/*
+ * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ * its contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "SamplingTool.h"
+
+#include "CodeBlock.h"
+#include "Interpreter.h"
+#include "Opcode.h"
+
+#if !OS(WINDOWS)
+#include <unistd.h>
+#endif
+
+namespace JSC {
+
+#if ENABLE(SAMPLING_FLAGS)
+
+void SamplingFlags::sample()
+{
+ uint32_t mask = static_cast<uint32_t>(1 << 31);
+ unsigned index;
+
+ for (index = 0; index < 32; ++index) {
+ if (mask & s_flags)
+ break;
+ mask >>= 1;
+ }
+
+ s_flagCounts[32 - index]++;
+}
+
+void SamplingFlags::start()
+{
+ for (unsigned i = 0; i <= 32; ++i)
+ s_flagCounts[i] = 0;
+}
+void SamplingFlags::stop()
+{
+ uint64_t total = 0;
+ for (unsigned i = 0; i <= 32; ++i)
+ total += s_flagCounts[i];
+
+ if (total) {
+ printf("\nSamplingFlags: sample counts with flags set: (%lld total)\n", total);
+ for (unsigned i = 0; i <= 32; ++i) {
+ if (s_flagCounts[i])
+ printf(" [ %02d ] : %lld\t\t(%03.2f%%)\n", i, s_flagCounts[i], (100.0 * s_flagCounts[i]) / total);
+ }
+ printf("\n");
+ } else
+ printf("\nSamplingFlags: no samples.\n\n");
+}
+uint64_t SamplingFlags::s_flagCounts[33];
+
+#else
+void SamplingFlags::start() {}
+void SamplingFlags::stop() {}
+#endif
+
+/*
+ Start with flag 16 set.
+ By doing this the monitoring of lower valued flags will be masked out
+ until flag 16 is explictly cleared.
+*/
+uint32_t SamplingFlags::s_flags = 1 << 15;
+
+
+#if OS(WINDOWS)
+
+static void sleepForMicroseconds(unsigned us)
+{
+ unsigned ms = us / 1000;
+ if (us && !ms)
+ ms = 1;
+ Sleep(ms);
+}
+
+#else
+
+static void sleepForMicroseconds(unsigned us)
+{
+ usleep(us);
+}
+
+#endif
+
+static inline unsigned hertz2us(unsigned hertz)
+{
+ return 1000000 / hertz;
+}
+
+
+SamplingTool* SamplingTool::s_samplingTool = 0;
+
+
+bool SamplingThread::s_running = false;
+unsigned SamplingThread::s_hertz = 10000;
+ThreadIdentifier SamplingThread::s_samplingThread;
+
+void* SamplingThread::threadStartFunc(void*)
+{
+ while (s_running) {
+ sleepForMicroseconds(hertz2us(s_hertz));
+
+#if ENABLE(SAMPLING_FLAGS)
+ SamplingFlags::sample();
+#endif
+#if ENABLE(OPCODE_SAMPLING)
+ SamplingTool::sample();
+#endif
+ }
+
+ return 0;
+}
+
+
+void SamplingThread::start(unsigned hertz)
+{
+ ASSERT(!s_running);
+ s_running = true;
+ s_hertz = hertz;
+
+ s_samplingThread = createThread(threadStartFunc, 0, "JavaScriptCore::Sampler");
+}
+
+void SamplingThread::stop()
+{
+ ASSERT(s_running);
+ s_running = false;
+ waitForThreadCompletion(s_samplingThread, 0);
+}
+
+
+void ScriptSampleRecord::sample(CodeBlock* codeBlock, Instruction* vPC)
+{
+ if (!m_samples) {
+ m_size = codeBlock->instructions().size();
+ m_samples = static_cast<int*>(calloc(m_size, sizeof(int)));
+ m_codeBlock = codeBlock;
+ }
+
+ ++m_sampleCount;
+
+ unsigned offest = vPC - codeBlock->instructions().begin();
+ // Since we don't read and write codeBlock and vPC atomically, this check
+ // can fail if we sample mid op_call / op_ret.
+ if (offest < m_size) {
+ m_samples[offest]++;
+ m_opcodeSampleCount++;
+ }
+}
+
+void SamplingTool::doRun()
+{
+ Sample sample(m_sample, m_codeBlock);
+ ++m_sampleCount;
+
+ if (sample.isNull())
+ return;
+
+ if (!sample.inHostFunction()) {
+ unsigned opcodeID = m_interpreter->getOpcodeID(sample.vPC()[0].u.opcode);
+
+ ++m_opcodeSampleCount;
+ ++m_opcodeSamples[opcodeID];
+
+ if (sample.inCTIFunction())
+ m_opcodeSamplesInCTIFunctions[opcodeID]++;
+ }
+
+#if ENABLE(CODEBLOCK_SAMPLING)
+ if (CodeBlock* codeBlock = sample.codeBlock()) {
+ MutexLocker locker(m_scriptSampleMapMutex);
+ ScriptSampleRecord* record = m_scopeSampleMap->get(codeBlock->ownerExecutable());
+ ASSERT(record);
+ record->sample(codeBlock, sample.vPC());
+ }
+#endif
+}
+
+void SamplingTool::sample()
+{
+ s_samplingTool->doRun();
+}
+
+void SamplingTool::notifyOfScope(ScriptExecutable* script)
+{
+#if ENABLE(CODEBLOCK_SAMPLING)
+ MutexLocker locker(m_scriptSampleMapMutex);
+ m_scopeSampleMap->set(script, new ScriptSampleRecord(script));
+#else
+ UNUSED_PARAM(script);
+#endif
+}
+
+void SamplingTool::setup()
+{
+ s_samplingTool = this;
+}
+
+#if ENABLE(OPCODE_SAMPLING)
+
+struct OpcodeSampleInfo {
+ OpcodeID opcode;
+ long long count;
+ long long countInCTIFunctions;
+};
+
+struct LineCountInfo {
+ unsigned line;
+ unsigned count;
+};
+
+static int compareOpcodeIndicesSampling(const void* left, const void* right)
+{
+ const OpcodeSampleInfo* leftSampleInfo = reinterpret_cast<const OpcodeSampleInfo*>(left);
+ const OpcodeSampleInfo* rightSampleInfo = reinterpret_cast<const OpcodeSampleInfo*>(right);
+
+ return (leftSampleInfo->count < rightSampleInfo->count) ? 1 : (leftSampleInfo->count > rightSampleInfo->count) ? -1 : 0;
+}
+
+#if ENABLE(CODEBLOCK_SAMPLING)
+static int compareLineCountInfoSampling(const void* left, const void* right)
+{
+ const LineCountInfo* leftLineCount = reinterpret_cast<const LineCountInfo*>(left);
+ const LineCountInfo* rightLineCount = reinterpret_cast<const LineCountInfo*>(right);
+
+ return (leftLineCount->line > rightLineCount->line) ? 1 : (leftLineCount->line < rightLineCount->line) ? -1 : 0;
+}
+
+static int compareScriptSampleRecords(const void* left, const void* right)
+{
+ const ScriptSampleRecord* const leftValue = *static_cast<const ScriptSampleRecord* const *>(left);
+ const ScriptSampleRecord* const rightValue = *static_cast<const ScriptSampleRecord* const *>(right);
+
+ return (leftValue->m_sampleCount < rightValue->m_sampleCount) ? 1 : (leftValue->m_sampleCount > rightValue->m_sampleCount) ? -1 : 0;
+}
+#endif
+
+void SamplingTool::dump(ExecState* exec)
+{
+ // Tidies up SunSpider output by removing short scripts - such a small number of samples would likely not be useful anyhow.
+ if (m_sampleCount < 10)
+ return;
+
+ // (1) Build and sort 'opcodeSampleInfo' array.
+
+ OpcodeSampleInfo opcodeSampleInfo[numOpcodeIDs];
+ for (int i = 0; i < numOpcodeIDs; ++i) {
+ opcodeSampleInfo[i].opcode = static_cast<OpcodeID>(i);
+ opcodeSampleInfo[i].count = m_opcodeSamples[i];
+ opcodeSampleInfo[i].countInCTIFunctions = m_opcodeSamplesInCTIFunctions[i];
+ }
+
+ qsort(opcodeSampleInfo, numOpcodeIDs, sizeof(OpcodeSampleInfo), compareOpcodeIndicesSampling);
+
+ // (2) Print Opcode sampling results.
+
+ printf("\nBytecode samples [*]\n");
+ printf(" sample %% of %% of | cti cti %%\n");
+ printf("opcode count VM total | count of self\n");
+ printf("------------------------------------------------------- | ----------------\n");
+
+ for (int i = 0; i < numOpcodeIDs; ++i) {
+ long long count = opcodeSampleInfo[i].count;
+ if (!count)
+ continue;
+
+ OpcodeID opcodeID = opcodeSampleInfo[i].opcode;
+
+ const char* opcodeName = opcodeNames[opcodeID];
+ const char* opcodePadding = padOpcodeName(opcodeID, 28);
+ double percentOfVM = (static_cast<double>(count) * 100) / m_opcodeSampleCount;
+ double percentOfTotal = (static_cast<double>(count) * 100) / m_sampleCount;
+ long long countInCTIFunctions = opcodeSampleInfo[i].countInCTIFunctions;
+ double percentInCTIFunctions = (static_cast<double>(countInCTIFunctions) * 100) / count;
+ fprintf(stdout, "%s:%s%-6lld %.3f%%\t%.3f%%\t | %-6lld %.3f%%\n", opcodeName, opcodePadding, count, percentOfVM, percentOfTotal, countInCTIFunctions, percentInCTIFunctions);
+ }
+
+ printf("\n[*] Samples inside host code are not charged to any Bytecode.\n\n");
+ printf("\tSamples inside VM:\t\t%lld / %lld (%.3f%%)\n", m_opcodeSampleCount, m_sampleCount, (static_cast<double>(m_opcodeSampleCount) * 100) / m_sampleCount);
+ printf("\tSamples inside host code:\t%lld / %lld (%.3f%%)\n\n", m_sampleCount - m_opcodeSampleCount, m_sampleCount, (static_cast<double>(m_sampleCount - m_opcodeSampleCount) * 100) / m_sampleCount);
+ printf("\tsample count:\tsamples inside this opcode\n");
+ printf("\t%% of VM:\tsample count / all opcode samples\n");
+ printf("\t%% of total:\tsample count / all samples\n");
+ printf("\t--------------\n");
+ printf("\tcti count:\tsamples inside a CTI function called by this opcode\n");
+ printf("\tcti %% of self:\tcti count / sample count\n");
+
+#if ENABLE(CODEBLOCK_SAMPLING)
+
+ // (3) Build and sort 'codeBlockSamples' array.
+
+ int scopeCount = m_scopeSampleMap->size();
+ Vector<ScriptSampleRecord*> codeBlockSamples(scopeCount);
+ ScriptSampleRecordMap::iterator iter = m_scopeSampleMap->begin();
+ for (int i = 0; i < scopeCount; ++i, ++iter)
+ codeBlockSamples[i] = iter->second;
+
+ qsort(codeBlockSamples.begin(), scopeCount, sizeof(ScriptSampleRecord*), compareScriptSampleRecords);
+
+ // (4) Print data from 'codeBlockSamples' array.
+
+ printf("\nCodeBlock samples\n\n");
+
+ for (int i = 0; i < scopeCount; ++i) {
+ ScriptSampleRecord* record = codeBlockSamples[i];
+ CodeBlock* codeBlock = record->m_codeBlock;
+
+ double blockPercent = (record->m_sampleCount * 100.0) / m_sampleCount;
+
+ if (blockPercent >= 1) {
+ //Instruction* code = codeBlock->instructions().begin();
+ printf("#%d: %s:%d: %d / %lld (%.3f%%)\n", i + 1, record->m_executable->sourceURL().ascii(), codeBlock->lineNumberForBytecodeOffset(exec, 0), record->m_sampleCount, m_sampleCount, blockPercent);
+ if (i < 10) {
+ HashMap<unsigned,unsigned> lineCounts;
+ codeBlock->dump(exec);
+
+ printf(" Opcode and line number samples [*]\n\n");
+ for (unsigned op = 0; op < record->m_size; ++op) {
+ int count = record->m_samples[op];
+ if (count) {
+ printf(" [% 4d] has sample count: % 4d\n", op, count);
+ unsigned line = codeBlock->lineNumberForBytecodeOffset(exec, op);
+ lineCounts.set(line, (lineCounts.contains(line) ? lineCounts.get(line) : 0) + count);
+ }
+ }
+ printf("\n");
+
+ int linesCount = lineCounts.size();
+ Vector<LineCountInfo> lineCountInfo(linesCount);
+ int lineno = 0;
+ for (HashMap<unsigned,unsigned>::iterator iter = lineCounts.begin(); iter != lineCounts.end(); ++iter, ++lineno) {
+ lineCountInfo[lineno].line = iter->first;
+ lineCountInfo[lineno].count = iter->second;
+ }
+
+ qsort(lineCountInfo.begin(), linesCount, sizeof(LineCountInfo), compareLineCountInfoSampling);
+
+ for (lineno = 0; lineno < linesCount; ++lineno) {
+ printf(" Line #%d has sample count %d.\n", lineCountInfo[lineno].line, lineCountInfo[lineno].count);
+ }
+ printf("\n");
+ printf(" [*] Samples inside host code are charged to the calling Bytecode.\n");
+ printf(" Samples on a call / return boundary are not charged to a specific opcode or line.\n\n");
+ printf(" Samples on a call / return boundary: %d / %d (%.3f%%)\n\n", record->m_sampleCount - record->m_opcodeSampleCount, record->m_sampleCount, (static_cast<double>(record->m_sampleCount - record->m_opcodeSampleCount) * 100) / record->m_sampleCount);
+ }
+ }
+ }
+#else
+ UNUSED_PARAM(exec);
+#endif
+}
+
+#else
+
+void SamplingTool::dump(ExecState*)
+{
+}
+
+#endif
+
+void AbstractSamplingCounter::dump()
+{
+#if ENABLE(SAMPLING_COUNTERS)
+ if (s_abstractSamplingCounterChain != &s_abstractSamplingCounterChainEnd) {
+ printf("\nSampling Counter Values:\n");
+ for (AbstractSamplingCounter* currCounter = s_abstractSamplingCounterChain; (currCounter != &s_abstractSamplingCounterChainEnd); currCounter = currCounter->m_next)
+ printf("\t%s\t: %lld\n", currCounter->m_name, currCounter->m_counter);
+ printf("\n\n");
+ }
+ s_completed = true;
+#endif
+}
+
+AbstractSamplingCounter AbstractSamplingCounter::s_abstractSamplingCounterChainEnd;
+AbstractSamplingCounter* AbstractSamplingCounter::s_abstractSamplingCounterChain = &s_abstractSamplingCounterChainEnd;
+bool AbstractSamplingCounter::s_completed = false;
+
+} // namespace JSC