Long live Qt 4.5!

1 files changed, 300 insertions, 0 deletions

diff --git a/src/3rdparty/webkit/JavaScriptCore/bytecode/SamplingTool.cpp b/src/3rdparty/webkit/JavaScriptCore/bytecode/SamplingTool.cpp
new file mode 100644
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+++ b/src/3rdparty/webkit/JavaScriptCore/bytecode/SamplingTool.cpp
@@ -0,0 +1,300 @@
+/*
+ * 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 !PLATFORM(WIN_OS)
+#include <unistd.h>
+#endif
+
+namespace JSC {
+
+void ScopeSampleRecord::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++;
+    }
+}
+
+#if PLATFORM(WIN_OS)
+
+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;
+}
+
+void SamplingTool::run()
+{
+    while (m_running) {
+        sleepForMicroseconds(hertz2us(m_hertz));
+
+        Sample sample(m_sample, m_codeBlock);
+        ++m_sampleCount;
+
+        if (sample.isNull())
+            continue;
+
+        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)
+        MutexLocker locker(m_scopeSampleMapMutex);
+        ScopeSampleRecord* record = m_scopeSampleMap->get(sample.codeBlock()->ownerNode);
+        ASSERT(record);
+        record->sample(sample.codeBlock(), sample.vPC());
+#endif
+    }
+}
+
+void* SamplingTool::threadStartFunc(void* samplingTool)
+{
+    reinterpret_cast<SamplingTool*>(samplingTool)->run();
+    return 0;
+}
+
+void SamplingTool::notifyOfScope(ScopeNode* scope)
+{
+    MutexLocker locker(m_scopeSampleMapMutex);
+    m_scopeSampleMap->set(scope, new ScopeSampleRecord(scope));
+}
+
+void SamplingTool::start(unsigned hertz)
+{
+    ASSERT(!m_running);
+    m_running = true;
+    m_hertz = hertz;
+
+    m_samplingThread = createThread(threadStartFunc, this, "JavaScriptCore::Sampler");
+}
+
+void SamplingTool::stop()
+{
+    ASSERT(m_running);
+    m_running = false;
+    waitForThreadCompletion(m_samplingThread, 0);
+}
+
+#if ENABLE(OPCODE_SAMPLING)
+
+struct OpcodeSampleInfo {
+    OpcodeID opcode;
+    long long count;
+    long long countInCTIFunctions;
+};
+
+struct LineCountInfo {
+    unsigned line;
+    unsigned count;
+};
+
+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 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;
+}
+
+static int compareScopeSampleRecords(const void* left, const void* right)
+{
+    const ScopeSampleRecord* const leftValue = *static_cast<const ScopeSampleRecord* const *>(left);
+    const ScopeSampleRecord* const rightValue = *static_cast<const ScopeSampleRecord* const *>(right);
+
+    return (leftValue->m_sampleCount < rightValue->m_sampleCount) ? 1 : (leftValue->m_sampleCount > rightValue->m_sampleCount) ? -1 : 0;
+}
+
+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");
+    
+    // (3) Build and sort 'codeBlockSamples' array.
+
+    int scopeCount = m_scopeSampleMap->size();
+    Vector<ScopeSampleRecord*> codeBlockSamples(scopeCount);
+    ScopeSampleRecordMap::iterator iter = m_scopeSampleMap->begin();
+    for (int i = 0; i < scopeCount; ++i, ++iter)
+        codeBlockSamples[i] = iter->second;
+
+    qsort(codeBlockSamples.begin(), scopeCount, sizeof(ScopeSampleRecord*), compareScopeSampleRecords);
+
+    // (4) Print data from 'codeBlockSamples' array.
+
+    printf("\nCodeBlock samples\n\n"); 
+
+    for (int i = 0; i < scopeCount; ++i) {
+        ScopeSampleRecord* 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_scope->sourceURL().UTF8String().c_str(), codeBlock->lineNumberForBytecodeOffset(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);
+                        // It is okay to pass 0 as the CallFrame for lineNumberForBytecodeOffset since
+                        // we ensure exception information when Sampling is enabled.
+                        unsigned line = codeBlock->lineNumberForBytecodeOffset(0, 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
+
+void SamplingTool::dump(ExecState*)
+{
+}
+
+#endif
+
+} // namespace JSC