Changeset 284690 in webkit for trunk/Source/JavaScriptCore/bytecompiler

Timestamp:

Oct 22, 2021, 9:36:49 AM (4 years ago)

Author:

[email protected]

Message:

--reportBytecodeCompileTimes=1 should correctly report the bytecode size
​https://bugs.webkit.org/show_bug.cgi?id=232118

Reviewed by Michael Saboff.

generate() calls m_writer.finalize() which moves m_instructions, so when we later query its size we get 0.
The solution is simply to put the size in an out-parameter just before calling finalize().

• bytecompiler/BytecodeGenerator.cpp:

(JSC::BytecodeGenerator::generate):

• bytecompiler/BytecodeGenerator.h:

(JSC::BytecodeGenerator::generate):

Location:

trunk/Source/JavaScriptCore/bytecompiler

Files:

• BytecodeGenerator.cpp (modified) (2 diffs)
• BytecodeGenerator.h (modified) (2 diffs)

trunk/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp

@@ -149 +149 @@
 }
 
-ParserError BytecodeGenerator::generate()
+ParserError BytecodeGenerator::generate(unsigned& size)
 {
     if (UNLIKELY(m_outOfMemoryDuringConstruction))
@@ -286 +286 @@
 
     RELEASE_ASSERT(m_codeBlock->numCalleeLocals() < static_cast<unsigned>(FirstConstantRegisterIndex));
+    size = instructions().size();
     m_codeBlock->finalize(m_writer.finalize());
     if (m_expressionTooDeep)

trunk/Source/JavaScriptCore/bytecompiler/BytecodeGenerator.h

@@ -385 +385 @@
             DeferGC deferGC(vm.heap);
             auto bytecodeGenerator = makeUnique<BytecodeGenerator>(vm, node, unlinkedCodeBlock, codeGenerationMode, parentScopeTDZVariables, privateNameEnvironment);
-            auto result = bytecodeGenerator->generate();
+            unsigned size;
+            auto result = bytecodeGenerator->generate(size);
 
             if (UNLIKELY(Options::reportBytecodeCompileTimes())) {
                 MonotonicTime after = MonotonicTime::now();
-                dataLogLn(result.isValid() ? "Failed to compile #" : "Compiled #", CodeBlockHash(sourceCode, unlinkedCodeBlock->isConstructor() ? CodeForConstruct : CodeForCall), " into bytecode ", bytecodeGenerator->instructions().size(), " instructions in ", (after - before).milliseconds(), " ms.");
+                dataLogLn(result.isValid() ? "Failed to compile #" : "Compiled #", CodeBlockHash(sourceCode, unlinkedCodeBlock->isConstructor() ? CodeForConstruct : CodeForCall), " into bytecode ", size, " instructions in ", (after - before).milliseconds(), " ms.");
             }
             return result;
@@ -1075 +1076 @@
 
     private:
-        ParserError generate();
+        ParserError generate(unsigned&);
         Variable variableForLocalEntry(const Identifier&, const SymbolTableEntry&, int symbolTableConstantIndex, bool isLexicallyScoped);