Always set the callee's context when calling a function from optimized code.

This is necessary even for recursive calls because we're sharing optimized code among closures, which could call each other and have distinct contexts.

BUG=138887
TEST=mjsunit/regress/regress-crbug-138887

Review URL: https://chromiumcodereview.appspot.com/10834031

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12201 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/lithium-codegen-arm.cc

@@ -3193,14 +3193,8 @@ void LCodeGen::CallKnownFunction(Handle<JSFunction> function,
       __ LoadHeapObject(r1, function);
     }
 
-    // Change context if needed.
-    bool change_context =
-        (info()->closure()->context() != function->context()) ||
-        scope()->contains_with() ||
-        (scope()->num_heap_slots() > 0);
-    if (change_context) {
-      __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
-    }
+    // Change context.
+    __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
 
     // Set r0 to arguments count if adaption is not needed. Assumes that r0
     // is available to write to at this point.

src/ia32/lithium-codegen-ia32.cc

@@ -3013,17 +3013,8 @@ void LCodeGen::CallKnownFunction(Handle<JSFunction> function,
       __ LoadHeapObject(edi, function);
     }
 
-    // Change context if needed.
-    bool change_context =
-        (info()->closure()->context() != function->context()) ||
-        scope()->contains_with() ||
-        (scope()->num_heap_slots() > 0);
-
-    if (change_context) {
-      __ mov(esi, FieldOperand(edi, JSFunction::kContextOffset));
-    } else {
-      __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));
-    }
+    // Change context.
+    __ mov(esi, FieldOperand(edi, JSFunction::kContextOffset));
 
     // Set eax to arguments count if adaption is not needed. Assumes that eax
     // is available to write to at this point.

src/mips/lithium-codegen-mips.cc

@@ -2948,14 +2948,8 @@ void LCodeGen::CallKnownFunction(Handle<JSFunction> function,
       __ LoadHeapObject(a1, function);
     }
 
-    // Change context if needed.
-    bool change_context =
-        (info()->closure()->context() != function->context()) ||
-        scope()->contains_with() ||
-        (scope()->num_heap_slots() > 0);
-    if (change_context) {
-      __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
-    }
+    // Change context.
+    __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
 
     // Set r0 to arguments count if adaption is not needed. Assumes that r0
     // is available to write to at this point.

src/x64/lithium-codegen-x64.cc

@@ -2892,14 +2892,8 @@ void LCodeGen::CallKnownFunction(Handle<JSFunction> function,
       __ LoadHeapObject(rdi, function);
     }
 
-    // Change context if needed.
-    bool change_context =
-        (info()->closure()->context() != function->context()) ||
-        scope()->contains_with() ||
-        (scope()->num_heap_slots() > 0);
-    if (change_context) {
-      __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
-    }
+    // Change context.
+    __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
 
     // Set rax to arguments count if adaption is not needed. Assumes that rax
     // is available to write to at this point.

test/mjsunit/regress/regress-crbug-138887.js

+// Copyright 2012 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.
+
+// Flags: --allow-natives-syntax
+
+function worker1(ignored) {
+  return 100;
+}
+
+function factory(worker) {
+  return function(call_depth) {
+    if (call_depth == 0) return 10;
+    return 1 + worker(call_depth - 1);
+  }
+}
+
+var f1 = factory(worker1);
+var f2 = factory(f1);
+assertEquals(11, f2(1));  // Result: 1 + f1(0) == 1 + 10.
+assertEquals(11, f2(1));
+%OptimizeFunctionOnNextCall(f1);
+assertEquals(10, f1(0));  // Terminates immediately -> returns 10.
+%OptimizeFunctionOnNextCall(f2);
+assertEquals(102, f2(1000));  // 1 + f1(999) == 1 + 1 + worker1(998) == 102