Changeset 37763 in webkit for trunk/JavaScriptCore/kjs/nodes.cpp

Timestamp:

Oct 21, 2008, 2:29:31 PM (17 years ago)

Author:

Darin Adler

Message:

2008-10-21 Darin Adler <Darin Adler>

Reviewed by Maciej Stachowiak.

• convert post-increment to pre-increment in a couple more places for speed

Speeds up V8 benchmarks a little on most computers. (But, strangely, slows
them down a little on my computer.)

• kjs/nodes.cpp: (JSC::statementListEmitCode): Removed default argument, since we always want to specify this explicitly. (JSC::ForNode::emitCode): Tolerate ignoredResult() as the dst -- means the same thing as 0. (JSC::ReturnNode::emitCode): Ditto. (JSC::ThrowNode::emitCode): Ditto. (JSC::FunctionBodyNode::emitCode): Pass ignoredResult() so that we know we don't have to compute the result of function statements.

File:

• trunk/JavaScriptCore/kjs/nodes.cpp (modified) (5 diffs)

trunk/JavaScriptCore/kjs/nodes.cpp

@@ -1058 +1058 @@
 // ------------------------------ Helper functions for handling Vectors of StatementNode -------------------------------
 
-static inline RegisterID* statementListEmitCode(StatementVector& statements, CodeGenerator& generator, RegisterID* dst = 0)
+static inline RegisterID* statementListEmitCode(StatementVector& statements, CodeGenerator& generator, RegisterID* dst)
 {
     StatementVector::iterator end = statements.end();
@@ -1228 +1228 @@
 RegisterID* ForNode::emitCode(CodeGenerator& generator, RegisterID* dst)
 {
+    if (dst == ignoredResult())
+        dst = 0;
+
     generator.emitDebugHook(WillExecuteStatement, firstLine(), lastLine());
 
@@ -1408 +1411 @@
     if (generator.codeType() != FunctionCode)
         return emitThrowError(generator, SyntaxError, "Invalid return statement.");
-        
+
+    if (dst == ignoredResult())
+        dst = 0;
     RegisterID* r0 = m_value ? generator.emitNode(dst, m_value.get()) : generator.emitLoad(dst, jsUndefined());
     if (generator.scopeDepth()) {
@@ -1613 +1618 @@
 RegisterID* ThrowNode::emitCode(CodeGenerator& generator, RegisterID* dst)
 {
+    if (dst == ignoredResult())
+        dst = 0;
     RefPtr<RegisterID> expr = generator.emitNode(dst, m_expr.get());
     generator.emitExpressionInfo(m_divot, m_startOffset, m_endOffset);
@@ -1809 +1816 @@
 {
     generator.emitDebugHook(DidEnterCallFrame, firstLine(), lastLine());
-    statementListEmitCode(m_children, generator);
+    statementListEmitCode(m_children, generator, ignoredResult());
     if (!m_children.size() || !m_children.last()->isReturnNode()) {
         RegisterID* r0 = generator.emitLoad(0, jsUndefined());