Port eval resolve in call optimization from classic to full codegen.

Review URL: http://codereview.chromium.org/6598066

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6998 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/full-codegen-arm.cc

@@ -2132,6 +2132,29 @@ void FullCodeGenerator::EmitCallWithStub(Call* expr) {
 }
 
 
+void FullCodeGenerator::EmitResolvePossiblyDirectEval(ResolveEvalFlag flag,
+                                                      int arg_count) {
+  // Push copy of the first argument or undefined if it doesn't exist.
+  if (arg_count > 0) {
+    __ ldr(r1, MemOperand(sp, arg_count * kPointerSize));
+  } else {
+    __ LoadRoot(r1, Heap::kUndefinedValueRootIndex);
+  }
+  __ push(r1);
+
+  // Push the receiver of the enclosing function and do runtime call.
+  __ ldr(r1, MemOperand(fp, (2 + scope()->num_parameters()) * kPointerSize));
+  __ push(r1);
+  // Push the strict mode flag.
+  __ mov(r1, Operand(Smi::FromInt(strict_mode_flag())));
+  __ push(r1);
+
+  __ CallRuntime(flag == SKIP_CONTEXT_LOOKUP
+                 ? Runtime::kResolvePossiblyDirectEvalNoLookup
+                 : Runtime::kResolvePossiblyDirectEval, 4);
+}
+
+
 void FullCodeGenerator::VisitCall(Call* expr) {
 #ifdef DEBUG
   // We want to verify that RecordJSReturnSite gets called on all paths
@@ -2161,26 +2184,31 @@ void FullCodeGenerator::VisitCall(Call* expr) {
         VisitForStackValue(args->at(i));
       }
 
-      // Push copy of the function - found below the arguments.
-      __ ldr(r1, MemOperand(sp, (arg_count + 1) * kPointerSize));
-      __ push(r1);
-
-      // Push copy of the first argument or undefined if it doesn't exist.
-      if (arg_count > 0) {
-        __ ldr(r1, MemOperand(sp, arg_count * kPointerSize));
-        __ push(r1);
-      } else {
-        __ push(r2);
+      // If we know that eval can only be shadowed by eval-introduced
+      // variables we attempt to load the global eval function directly
+      // in generated code. If we succeed, there is no need to perform a
+      // context lookup in the runtime system.
+      Label done;
+      if (var->AsSlot() != NULL && var->mode() == Variable::DYNAMIC_GLOBAL) {
+        Label slow;
+        EmitLoadGlobalSlotCheckExtensions(var->AsSlot(),
+                                          NOT_INSIDE_TYPEOF,
+                                          &slow);
+        // Push the function and resolve eval.
+        __ push(r0);
+        EmitResolvePossiblyDirectEval(SKIP_CONTEXT_LOOKUP, arg_count);
+        __ jmp(&done);
+        __ bind(&slow);
       }
 
-      // Push the receiver of the enclosing function and do runtime call.
-      __ ldr(r1,
-             MemOperand(fp, (2 + scope()->num_parameters()) * kPointerSize));
-      __ push(r1);
-      // Push the strict mode flag.
-      __ mov(r1, Operand(Smi::FromInt(strict_mode_flag())));
+      // Push copy of the function (found below the arguments) and
+      // resolve eval.
+      __ ldr(r1, MemOperand(sp, (arg_count + 1) * kPointerSize));
       __ push(r1);
-      __ CallRuntime(Runtime::kResolvePossiblyDirectEval, 4);
+      EmitResolvePossiblyDirectEval(PERFORM_CONTEXT_LOOKUP, arg_count);
+      if (done.is_linked()) {
+        __ bind(&done);
+      }
 
       // The runtime call returns a pair of values in r0 (function) and
       // r1 (receiver). Touch up the stack with the right values.

src/full-codegen.h

@@ -421,6 +421,14 @@ class FullCodeGenerator: public AstVisitor {
                                        Label* done);
   void EmitVariableLoad(Variable* expr);
 
+  enum ResolveEvalFlag {
+    SKIP_CONTEXT_LOOKUP,
+    PERFORM_CONTEXT_LOOKUP
+  };
+
+  // Expects the arguments and the function already pushed.
+  void EmitResolvePossiblyDirectEval(ResolveEvalFlag flag, int arg_count);
+
   // Platform-specific support for allocating a new closure based on
   // the given function info.
   void EmitNewClosure(Handle<SharedFunctionInfo> info, bool pretenure);

src/ia32/full-codegen-ia32.cc

@@ -2050,6 +2050,27 @@ void FullCodeGenerator::EmitCallWithStub(Call* expr) {
 }
 
 
+void FullCodeGenerator::EmitResolvePossiblyDirectEval(ResolveEvalFlag flag,
+                                                      int arg_count) {
+  // Push copy of the first argument or undefined if it doesn't exist.
+  if (arg_count > 0) {
+    __ push(Operand(esp, arg_count * kPointerSize));
+  } else {
+    __ push(Immediate(Factory::undefined_value()));
+  }
+
+  // Push the receiver of the enclosing function.
+  __ push(Operand(ebp, (2 + scope()->num_parameters()) * kPointerSize));
+
+  // Push the strict mode flag.
+  __ push(Immediate(Smi::FromInt(strict_mode_flag())));
+
+  __ CallRuntime(flag == SKIP_CONTEXT_LOOKUP
+                 ? Runtime::kResolvePossiblyDirectEvalNoLookup
+                 : Runtime::kResolvePossiblyDirectEval, 4);
+}
+
+
 void FullCodeGenerator::VisitCall(Call* expr) {
 #ifdef DEBUG
   // We want to verify that RecordJSReturnSite gets called on all paths
@@ -2078,21 +2099,30 @@ void FullCodeGenerator::VisitCall(Call* expr) {
         VisitForStackValue(args->at(i));
       }
 
-      // Push copy of the function - found below the arguments.
-      __ push(Operand(esp, (arg_count + 1) * kPointerSize));
-
-      // Push copy of the first argument or undefined if it doesn't exist.
-      if (arg_count > 0) {
-        __ push(Operand(esp, arg_count * kPointerSize));
-      } else {
-        __ push(Immediate(Factory::undefined_value()));
+      // If we know that eval can only be shadowed by eval-introduced
+      // variables we attempt to load the global eval function directly
+      // in generated code. If we succeed, there is no need to perform a
+      // context lookup in the runtime system.
+      Label done;
+      if (var->AsSlot() != NULL && var->mode() == Variable::DYNAMIC_GLOBAL) {
+        Label slow;
+        EmitLoadGlobalSlotCheckExtensions(var->AsSlot(),
+                                          NOT_INSIDE_TYPEOF,
+                                          &slow);
+        // Push the function and resolve eval.
+        __ push(eax);
+        EmitResolvePossiblyDirectEval(SKIP_CONTEXT_LOOKUP, arg_count);
+        __ jmp(&done);
+        __ bind(&slow);
       }
 
-      // Push the receiver of the enclosing function and do runtime call.
-      __ push(Operand(ebp, (2 + scope()->num_parameters()) * kPointerSize));
-      // Push the strict mode flag.
-      __ push(Immediate(Smi::FromInt(strict_mode_flag())));
-      __ CallRuntime(Runtime::kResolvePossiblyDirectEval, 4);
+      // Push copy of the function (found below the arguments) and
+      // resolve eval.
+      __ push(Operand(esp, (arg_count + 1) * kPointerSize));
+      EmitResolvePossiblyDirectEval(PERFORM_CONTEXT_LOOKUP, arg_count);
+      if (done.is_linked()) {
+        __ bind(&done);
+      }
 
       // The runtime call returns a pair of values in eax (function) and
       // edx (receiver). Touch up the stack with the right values.

src/x64/full-codegen-x64.cc

@@ -2034,6 +2034,27 @@ void FullCodeGenerator::EmitCallWithStub(Call* expr) {
 }
 
 
+void FullCodeGenerator::EmitResolvePossiblyDirectEval(ResolveEvalFlag flag,
+                                                      int arg_count) {
+  // Push copy of the first argument or undefined if it doesn't exist.
+  if (arg_count > 0) {
+    __ push(Operand(rsp, arg_count * kPointerSize));
+  } else {
+    __ PushRoot(Heap::kUndefinedValueRootIndex);
+  }
+
+  // Push the receiver of the enclosing function and do runtime call.
+  __ push(Operand(rbp, (2 + scope()->num_parameters()) * kPointerSize));
+
+  // Push the strict mode flag.
+  __ Push(Smi::FromInt(strict_mode_flag()));
+
+  __ CallRuntime(flag == SKIP_CONTEXT_LOOKUP
+                 ? Runtime::kResolvePossiblyDirectEvalNoLookup
+                 : Runtime::kResolvePossiblyDirectEval, 4);
+}
+
+
 void FullCodeGenerator::VisitCall(Call* expr) {
 #ifdef DEBUG
   // We want to verify that RecordJSReturnSite gets called on all paths
@@ -2061,21 +2082,30 @@ void FullCodeGenerator::VisitCall(Call* expr) {
         VisitForStackValue(args->at(i));
       }
 
-      // Push copy of the function - found below the arguments.
-      __ push(Operand(rsp, (arg_count + 1) * kPointerSize));
-
-      // Push copy of the first argument or undefined if it doesn't exist.
-      if (arg_count > 0) {
-        __ push(Operand(rsp, arg_count * kPointerSize));
-      } else {
-      __ PushRoot(Heap::kUndefinedValueRootIndex);
+      // If we know that eval can only be shadowed by eval-introduced
+      // variables we attempt to load the global eval function directly
+      // in generated code. If we succeed, there is no need to perform a
+      // context lookup in the runtime system.
+      Label done;
+      if (var->AsSlot() != NULL && var->mode() == Variable::DYNAMIC_GLOBAL) {
+        Label slow;
+        EmitLoadGlobalSlotCheckExtensions(var->AsSlot(),
+                                          NOT_INSIDE_TYPEOF,
+                                          &slow);
+        // Push the function and resolve eval.
+        __ push(rax);
+        EmitResolvePossiblyDirectEval(SKIP_CONTEXT_LOOKUP, arg_count);
+        __ jmp(&done);
+        __ bind(&slow);
       }
 
-      // Push the receiver of the enclosing function and do runtime call.
-      __ push(Operand(rbp, (2 + scope()->num_parameters()) * kPointerSize));
-      // Push the strict mode flag.
-      __ Push(Smi::FromInt(strict_mode_flag()));
-      __ CallRuntime(Runtime::kResolvePossiblyDirectEval, 4);
+      // Push copy of the function (found below the arguments) and
+      // resolve eval.
+      __ push(Operand(rsp, (arg_count + 1) * kPointerSize));
+      EmitResolvePossiblyDirectEval(PERFORM_CONTEXT_LOOKUP, arg_count);
+      if (done.is_linked()) {
+        __ bind(&done);
+      }
 
       // The runtime call returns a pair of values in rax (function) and
       // rdx (receiver). Touch up the stack with the right values.