Refactor the selection of code generator (toplevel or optimizing) and...

src/fast-codegen.cc

Index: src/fast-codegen.cc
===================================================================
--- src/fast-codegen.cc	(revision 0)
+++ src/fast-codegen.cc	(revision 0)
@@ -0,0 +1,306 @@
+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * 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.
+//     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+// OWNER OR 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 "v8.h"
+
+#include "fast-codegen.h"
+#include "scopes.h"
+
+namespace v8 {
+namespace internal {
+
+#define BAILOUT(reason)                         \
+  do {                                          \
+    if (FLAG_trace_bailout) {                   \
+      PrintF("%s\n", reason);                   \
+    }                                           \
+    has_supported_syntax_ = false;              \
+    return;                                     \
+  } while (false)
+
+
+#define CHECK_BAILOUT                           \
+  do {                                          \
+    if (!has_supported_syntax_) return;         \
+  } while (false)
+
+
+void FastCodeGenSyntaxChecker::Check(FunctionLiteral* fun) {
+  Scope* scope = fun->scope();
+
+  // We do not support stack or heap slots (both of which require
+  // allocation).
+  if (scope->num_stack_slots() > 0) {
+    BAILOUT("Function has stack-allocated locals");
+  }
+  if (scope->num_heap_slots() > 0) {
+    BAILOUT("Function has context-allocated locals");
+  }
+
+  VisitDeclarations(scope->declarations());
+  CHECK_BAILOUT;
+
+  // We do not support empty function bodies.
+  if (fun->body()->is_empty()) BAILOUT("Function has an empty body");
+  VisitStatements(fun->body());
+}
+
+
+void FastCodeGenSyntaxChecker::VisitDeclarations(
+    ZoneList<Declaration*>* decls) {
+  if (!decls->is_empty()) BAILOUT("Function has declarations");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitStatements(ZoneList<Statement*>* stmts) {
+  for (int i = 0, len = stmts->length(); i < len; i++) {
+    Visit(stmts->at(i));
+    CHECK_BAILOUT;
+  }
+}
+
+
+void FastCodeGenSyntaxChecker::VisitDeclaration(Declaration* decl) {
+  UNREACHABLE();
+}
+
+
+void FastCodeGenSyntaxChecker::VisitBlock(Block* stmt) {
+  VisitStatements(stmt->statements());
+}
+
+
+void FastCodeGenSyntaxChecker::VisitExpressionStatement(
+    ExpressionStatement* stmt) {
+  Visit(stmt->expression());
+}
+
+
+void FastCodeGenSyntaxChecker::VisitEmptyStatement(EmptyStatement* stmt) {
+  // Supported.
+}
+
+
+void FastCodeGenSyntaxChecker::VisitIfStatement(IfStatement* stmt) {
+  BAILOUT("IfStatement");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitContinueStatement(ContinueStatement* stmt) {
+  BAILOUT("Continuestatement");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitBreakStatement(BreakStatement* stmt) {
+  BAILOUT("BreakStatement");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitReturnStatement(ReturnStatement* stmt) {
+  BAILOUT("ReturnStatement");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitWithEnterStatement(
+    WithEnterStatement* stmt) {
+  BAILOUT("WithEnterStatement");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitWithExitStatement(WithExitStatement* stmt) {
+  BAILOUT("WithExitStatement");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitSwitchStatement(SwitchStatement* stmt) {
+  BAILOUT("SwitchStatement");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitDoWhileStatement(DoWhileStatement* stmt) {
+  BAILOUT("DoWhileStatement");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitWhileStatement(WhileStatement* stmt) {
+  BAILOUT("WhileStatement");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitForStatement(ForStatement* stmt) {
+  BAILOUT("ForStatement");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitForInStatement(ForInStatement* stmt) {
+  BAILOUT("ForInStatement");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitTryCatchStatement(TryCatchStatement* stmt) {
+  BAILOUT("TryCatchStatement");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitTryFinallyStatement(
+    TryFinallyStatement* stmt) {
+  BAILOUT("TryFinallyStatement");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitDebuggerStatement(
+    DebuggerStatement* stmt) {
+  BAILOUT("DebuggerStatement");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitFunctionLiteral(FunctionLiteral* expr) {
+  BAILOUT("FunctionLiteral");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitFunctionBoilerplateLiteral(
+    FunctionBoilerplateLiteral* expr) {
+  BAILOUT("FunctionBoilerplateLiteral");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitConditional(Conditional* expr) {
+  BAILOUT("Conditional");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitSlot(Slot* expr) {
+  UNREACHABLE();
+}
+
+
+void FastCodeGenSyntaxChecker::VisitVariableProxy(VariableProxy* expr) {
+  // Only global variable references are supported.
+  Variable* var = expr->var();
+  if (!var->is_global()) BAILOUT("Non-global variable");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitLiteral(Literal* expr) {
+  BAILOUT("Literal");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitRegExpLiteral(RegExpLiteral* expr) {
+  BAILOUT("RegExpLiteral");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitObjectLiteral(ObjectLiteral* expr) {
+  BAILOUT("ObjectLiteral");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitArrayLiteral(ArrayLiteral* expr) {
+  BAILOUT("ArrayLiteral");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitCatchExtensionObject(
+    CatchExtensionObject* expr) {
+  BAILOUT("CatchExtensionObject");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitAssignment(Assignment* expr) {
+  // Simple assignments to (named) this properties are supported.
+  if (expr->op() != Token::ASSIGN) BAILOUT("Non-simple assignment");
+
+  Property* prop = expr->target()->AsProperty();
+  if (prop == NULL) BAILOUT("Non-property assignment");
+  VariableProxy* proxy = prop->obj()->AsVariableProxy();
+  if (proxy == NULL || !proxy->var()->is_this()) {
+    BAILOUT("Non-this-property assignment");
+  }
+  if (!prop->key()->IsPropertyName()) {
+    BAILOUT("Non-named-property assignment");
+  }
+
+  Visit(expr->value());
+}
+
+
+void FastCodeGenSyntaxChecker::VisitThrow(Throw* expr) {
+  BAILOUT("Throw");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitProperty(Property* expr) {
+  BAILOUT("Property");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitCall(Call* expr) {
+  BAILOUT("Call");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitCallNew(CallNew* expr) {
+  BAILOUT("CallNew");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitCallRuntime(CallRuntime* expr) {
+  BAILOUT("CallRuntime");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitUnaryOperation(UnaryOperation* expr) {
+  BAILOUT("UnaryOperation");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitCountOperation(CountOperation* expr) {
+  BAILOUT("CountOperation");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitBinaryOperation(BinaryOperation* expr) {
+  BAILOUT("BinaryOperation");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitCompareOperation(CompareOperation* expr) {
+  BAILOUT("CompareOperation");
+}
+
+
+void FastCodeGenSyntaxChecker::VisitThisFunction(ThisFunction* expr) {
+  BAILOUT("ThisFunction");
+}
+
+#undef BAILOUT
+#undef CHECK_BAILOUT
+
+
+} }  // namespace v8::internal