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dart / sdk.git / refs/tags/0.1.5.1 / . / runtime / vm / code_generator.cc
blob: 61fc71bab48e10123ba189257606e8e2cdb81699 [file] [log] [blame]
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "vm/code_generator.h"
#include "vm/assembler_macros.h"
#include "vm/ast.h"
#include "vm/code_patcher.h"
#include "vm/compiler.h"
#include "vm/dart_api_impl.h"
#include "vm/dart_entry.h"
#include "vm/debugger.h"
#include "vm/deopt_instructions.h"
#include "vm/exceptions.h"
#include "vm/intermediate_language.h"
#include "vm/object_store.h"
#include "vm/message.h"
#include "vm/message_handler.h"
#include "vm/parser.h"
#include "vm/resolver.h"
#include "vm/runtime_entry.h"
#include "vm/stack_frame.h"
#include "vm/symbols.h"
#include "vm/verifier.h"
namespace dart {
DEFINE_FLAG(bool, deoptimize_alot, false,
"Deoptimizes all live frames when we are about to return to Dart code from"
" native entries.");
DEFINE_FLAG(bool, inline_cache, true, "Enable inline caches");
DEFINE_FLAG(bool, trace_deoptimization, false, "Trace deoptimization");
DEFINE_FLAG(bool, trace_deoptimization_verbose, false,
"Trace deoptimization verbose");
DEFINE_FLAG(bool, trace_ic, false, "Trace IC handling");
DEFINE_FLAG(bool, trace_ic_miss_in_optimized, false,
"Trace IC miss in optimized code");
DEFINE_FLAG(bool, trace_patching, false, "Trace patching of code.");
DEFINE_FLAG(bool, trace_runtime_calls, false, "Trace runtime calls");
DEFINE_FLAG(int, optimization_counter_threshold, 2000,
"Function's usage-counter value before it is optimized, -1 means never");
DECLARE_FLAG(bool, enable_type_checks);
DECLARE_FLAG(bool, trace_type_checks);
DECLARE_FLAG(bool, report_usage_count);
DECLARE_FLAG(int, deoptimization_counter_threshold);
DEFINE_FLAG(charp, optimization_filter, NULL, "Optimize only named function");
DEFINE_FLAG(bool, trace_failed_optimization_attempts, false,
"Traces all failed optimization attempts");
DEFINE_RUNTIME_ENTRY(TraceFunctionEntry, 1) {
ASSERT(arguments.Count() == kTraceFunctionEntryRuntimeEntry.argument_count());
const Function& function = Function::CheckedHandle(arguments.At(0));
const String& function_name = String::Handle(function.name());
const String& class_name =
String::Handle(Class::Handle(function.Owner()).Name());
OS::Print("> Entering '%s.%s'\n",
class_name.ToCString(), function_name.ToCString());
}
DEFINE_RUNTIME_ENTRY(TraceFunctionExit, 1) {
ASSERT(arguments.Count() == kTraceFunctionExitRuntimeEntry.argument_count());
const Function& function = Function::CheckedHandle(arguments.At(0));
const String& function_name = String::Handle(function.name());
const String& class_name =
String::Handle(Class::Handle(function.Owner()).Name());
OS::Print("< Exiting '%s.%s'\n",
class_name.ToCString(), function_name.ToCString());
}
// Allocation of a fixed length array of given element type.
// This runtime entry is never called for allocating a List of a generic type,
// because a prior run time call instantiates the element type if necessary.
// Arg0: array length.
// Arg1: array element type.
// Return value: newly allocated array of length arg0.
DEFINE_RUNTIME_ENTRY(AllocateArray, 2) {
ASSERT(arguments.Count() == kAllocateArrayRuntimeEntry.argument_count());
const Smi& length = Smi::CheckedHandle(arguments.At(0));
const Array& array = Array::Handle(Array::New(length.Value()));
arguments.SetReturn(array);
AbstractTypeArguments& element_type =
AbstractTypeArguments::CheckedHandle(arguments.At(1));
// An Array is raw or takes only one type argument.
ASSERT(element_type.IsNull() ||
((element_type.Length() == 1) && element_type.IsInstantiated()));
array.SetTypeArguments(element_type); // May be null.
}
// Allocate a new object.
// Arg0: class of the object that needs to be allocated.
// Arg1: type arguments of the object that needs to be allocated.
// Arg2: type arguments of the instantiator or kNoInstantiator.
// Return value: newly allocated object.
DEFINE_RUNTIME_ENTRY(AllocateObject, 3) {
ASSERT(arguments.Count() == kAllocateObjectRuntimeEntry.argument_count());
const Class& cls = Class::CheckedHandle(arguments.At(0));
const Instance& instance = Instance::Handle(Instance::New(cls));
arguments.SetReturn(instance);
if (!cls.HasTypeArguments()) {
// No type arguments required for a non-parameterized type.
ASSERT(Instance::CheckedHandle(arguments.At(1)).IsNull());
return;
}
AbstractTypeArguments& type_arguments =
AbstractTypeArguments::CheckedHandle(arguments.At(1));
ASSERT(type_arguments.IsNull() ||
(type_arguments.Length() == cls.NumTypeArguments()));
// If no instantiator is provided, set the type arguments and return.
if (Object::Handle(arguments.At(2)).IsSmi()) {
ASSERT(Smi::CheckedHandle(arguments.At(2)).Value() ==
StubCode::kNoInstantiator);
instance.SetTypeArguments(type_arguments); // May be null.
return;
}
ASSERT(!type_arguments.IsInstantiated());
const AbstractTypeArguments& instantiator =
AbstractTypeArguments::CheckedHandle(arguments.At(2));
ASSERT(instantiator.IsNull() || instantiator.IsInstantiated());
if (instantiator.IsNull()) {
type_arguments =
InstantiatedTypeArguments::New(type_arguments, instantiator);
} else if (instantiator.IsTypeArguments()) {
// Code inlined in the caller should have optimized the case where the
// instantiator is a TypeArguments and can be used as type argument vector.
ASSERT(!type_arguments.IsUninstantiatedIdentity() ||
(instantiator.Length() != type_arguments.Length()));
type_arguments =
InstantiatedTypeArguments::New(type_arguments, instantiator);
} else {
// If possible, use the instantiator as the type argument vector.
if (type_arguments.IsUninstantiatedIdentity() &&
(instantiator.Length() == type_arguments.Length())) {
type_arguments = instantiator.raw();
} else {
type_arguments =
InstantiatedTypeArguments::New(type_arguments, instantiator);
}
}
ASSERT(type_arguments.IsInstantiated());
instance.SetTypeArguments(type_arguments);
}
// Helper returning the token position of the Dart caller.
static intptr_t GetCallerLocation() {
DartFrameIterator iterator;
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
const Code& code = Code::Handle(caller_frame->LookupDartCode());
const PcDescriptors& descriptors =
PcDescriptors::Handle(code.pc_descriptors());
ASSERT(!descriptors.IsNull());
for (int i = 0; i < descriptors.Length(); i++) {
if (static_cast<uword>(descriptors.PC(i)) == caller_frame->pc()) {
return descriptors.TokenPos(i);
}
}
return -1;
}
// Allocate a new object of a generic type and check that the instantiated type
// arguments are within the declared bounds or throw a dynamic type error.
// Arg0: class of the object that needs to be allocated.
// Arg1: type arguments of the object that needs to be allocated.
// Arg2: type arguments of the instantiator or kNoInstantiator.
// Return value: newly allocated object.
DEFINE_RUNTIME_ENTRY(AllocateObjectWithBoundsCheck, 3) {
ASSERT(FLAG_enable_type_checks);
ASSERT(arguments.Count() ==
kAllocateObjectWithBoundsCheckRuntimeEntry.argument_count());
const Class& cls = Class::CheckedHandle(arguments.At(0));
const Instance& instance = Instance::Handle(Instance::New(cls));
arguments.SetReturn(instance);
ASSERT(cls.HasTypeArguments());
AbstractTypeArguments& type_arguments =
AbstractTypeArguments::CheckedHandle(arguments.At(1));
ASSERT(type_arguments.IsNull() ||
(type_arguments.Length() == cls.NumTypeArguments()));
AbstractTypeArguments& bounds_instantiator = AbstractTypeArguments::Handle();
if (Object::Handle(arguments.At(2)).IsSmi()) {
ASSERT(Smi::CheckedHandle(arguments.At(2)).Value() ==
StubCode::kNoInstantiator);
} else {
ASSERT(!type_arguments.IsInstantiated());
const AbstractTypeArguments& instantiator =
AbstractTypeArguments::CheckedHandle(arguments.At(2));
ASSERT(instantiator.IsNull() || instantiator.IsInstantiated());
if (instantiator.IsNull()) {
type_arguments =
InstantiatedTypeArguments::New(type_arguments, instantiator);
} else if (instantiator.IsTypeArguments()) {
// Code inlined in the caller should have optimized the case where the
// instantiator is a TypeArguments and can be used as type argument
// vector.
ASSERT(!type_arguments.IsUninstantiatedIdentity() ||
(instantiator.Length() != type_arguments.Length()));
type_arguments =
InstantiatedTypeArguments::New(type_arguments, instantiator);
} else {
// If possible, use the instantiator as the type argument vector.
if (type_arguments.IsUninstantiatedIdentity() &&
(instantiator.Length() == type_arguments.Length())) {
type_arguments = instantiator.raw();
} else {
type_arguments =
InstantiatedTypeArguments::New(type_arguments, instantiator);
}
}
bounds_instantiator = instantiator.raw();
}
if (!type_arguments.IsNull()) {
ASSERT(type_arguments.IsInstantiated());
Error& malformed_error = Error::Handle();
if (!type_arguments.IsWithinBoundsOf(cls,
bounds_instantiator,
&malformed_error)) {
ASSERT(!malformed_error.IsNull());
// Throw a dynamic type error.
const intptr_t location = GetCallerLocation();
String& malformed_error_message = String::Handle(
String::New(malformed_error.ToErrorCString()));
const String& no_name = String::Handle(Symbols::Empty());
Exceptions::CreateAndThrowTypeError(
location, no_name, no_name, no_name, malformed_error_message);
UNREACHABLE();
}
}
instance.SetTypeArguments(type_arguments);
}
// Instantiate type arguments.
// Arg0: uninstantiated type arguments.
// Arg1: instantiator type arguments.
// Return value: instantiated type arguments.
DEFINE_RUNTIME_ENTRY(InstantiateTypeArguments, 2) {
ASSERT(arguments.Count() ==
kInstantiateTypeArgumentsRuntimeEntry.argument_count());
AbstractTypeArguments& type_arguments =
AbstractTypeArguments::CheckedHandle(arguments.At(0));
const AbstractTypeArguments& instantiator =
AbstractTypeArguments::CheckedHandle(arguments.At(1));
ASSERT(!type_arguments.IsNull() && !type_arguments.IsInstantiated());
ASSERT(instantiator.IsNull() || instantiator.IsInstantiated());
// Code inlined in the caller should have optimized the case where the
// instantiator can be used as type argument vector.
ASSERT(instantiator.IsNull() ||
!type_arguments.IsUninstantiatedIdentity() ||
!instantiator.IsTypeArguments() ||
(instantiator.Length() != type_arguments.Length()));
type_arguments = InstantiatedTypeArguments::New(type_arguments, instantiator);
ASSERT(type_arguments.IsInstantiated());
arguments.SetReturn(type_arguments);
}
// Allocate a new closure.
// The type argument vector of a closure is always the vector of type parameters
// of its signature class, i.e. an uninstantiated identity vector. Therefore,
// the instantiator type arguments can be used as the instantiated closure type
// arguments and is passed here as the type arguments.
// Arg0: local function.
// Arg1: type arguments of the closure (i.e. instantiator).
// Return value: newly allocated closure.
DEFINE_RUNTIME_ENTRY(AllocateClosure, 2) {
ASSERT(arguments.Count() == kAllocateClosureRuntimeEntry.argument_count());
const Function& function = Function::CheckedHandle(arguments.At(0));
ASSERT(function.IsClosureFunction() && !function.IsImplicitClosureFunction());
const AbstractTypeArguments& type_arguments =
AbstractTypeArguments::CheckedHandle(arguments.At(1));
ASSERT(type_arguments.IsNull() || type_arguments.IsInstantiated());
// The current context was saved in the Isolate structure when entering the
// runtime.
const Context& context = Context::Handle(isolate->top_context());
ASSERT(!context.IsNull());
const Instance& closure = Instance::Handle(Closure::New(function, context));
Closure::SetTypeArguments(closure, type_arguments);
arguments.SetReturn(closure);
}
// Allocate a new implicit static closure.
// Arg0: local function.
// Return value: newly allocated closure.
DEFINE_RUNTIME_ENTRY(AllocateImplicitStaticClosure, 1) {
ASSERT(arguments.Count() ==
kAllocateImplicitStaticClosureRuntimeEntry.argument_count());
ObjectStore* object_store = isolate->object_store();
ASSERT(object_store != NULL);
const Function& function = Function::CheckedHandle(arguments.At(0));
ASSERT(!function.IsNull());
ASSERT(function.IsImplicitStaticClosureFunction());
const Context& context = Context::Handle(object_store->empty_context());
arguments.SetReturn(Instance::Handle(Closure::New(function, context)));
}
// Allocate a new implicit instance closure.
// Arg0: local function.
// Arg1: receiver object.
// Arg2: type arguments of the closure.
// Return value: newly allocated closure.
DEFINE_RUNTIME_ENTRY(AllocateImplicitInstanceClosure, 3) {
ASSERT(arguments.Count() ==
kAllocateImplicitInstanceClosureRuntimeEntry.argument_count());
const Function& function = Function::CheckedHandle(arguments.At(0));
ASSERT(function.IsImplicitInstanceClosureFunction());
const Instance& receiver = Instance::CheckedHandle(arguments.At(1));
const AbstractTypeArguments& type_arguments =
AbstractTypeArguments::CheckedHandle(arguments.At(2));
ASSERT(type_arguments.IsNull() || type_arguments.IsInstantiated());
Context& context = Context::Handle();
context = Context::New(1);
context.SetAt(0, receiver);
const Instance& closure = Instance::Handle(Closure::New(function, context));
Closure::SetTypeArguments(closure, type_arguments);
arguments.SetReturn(closure);
}
// Allocate a new context large enough to hold the given number of variables.
// Arg0: number of variables.
// Return value: newly allocated context.
DEFINE_RUNTIME_ENTRY(AllocateContext, 1) {
ASSERT(arguments.Count() == kAllocateContextRuntimeEntry.argument_count());
const Smi& num_variables = Smi::CheckedHandle(arguments.At(0));
arguments.SetReturn(Context::Handle(Context::New(num_variables.Value())));
}
// Make a copy of the given context, including the values of the captured
// variables.
// Arg0: the context to be cloned.
// Return value: newly allocated context.
DEFINE_RUNTIME_ENTRY(CloneContext, 1) {
ASSERT(arguments.Count() == kCloneContextRuntimeEntry.argument_count());
const Context& ctx = Context::CheckedHandle(arguments.At(0));
Context& cloned_ctx = Context::Handle(Context::New(ctx.num_variables()));
cloned_ctx.set_parent(Context::Handle(ctx.parent()));
for (int i = 0; i < ctx.num_variables(); i++) {
cloned_ctx.SetAt(i, Instance::Handle(ctx.At(i)));
}
arguments.SetReturn(cloned_ctx);
}
// Helper routine for tracing a type check.
static void PrintTypeCheck(
const char* message,
const Instance& instance,
const AbstractType& type,
const AbstractTypeArguments& instantiator_type_arguments,
const Bool& result) {
DartFrameIterator iterator;
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
const Type& instance_type = Type::Handle(instance.GetType());
ASSERT(instance_type.IsInstantiated());
if (type.IsInstantiated()) {
OS::Print("%s: '%s' %"Pd" %s '%s' %"Pd" (pc: %#"Px").\n",
message,
String::Handle(instance_type.Name()).ToCString(),
Class::Handle(instance_type.type_class()).id(),
(result.raw() == Bool::True()) ? "is" : "is !",
String::Handle(type.Name()).ToCString(),
Class::Handle(type.type_class()).id(),
caller_frame->pc());
} else {
// Instantiate type before printing.
const AbstractType& instantiated_type =
AbstractType::Handle(type.InstantiateFrom(instantiator_type_arguments));
OS::Print("%s: '%s' %s '%s' instantiated from '%s' (pc: %#"Px").\n",
message,
String::Handle(instance_type.Name()).ToCString(),
(result.raw() == Bool::True()) ? "is" : "is !",
String::Handle(instantiated_type.Name()).ToCString(),
String::Handle(type.Name()).ToCString(),
caller_frame->pc());
}
const Function& function = Function::Handle(
caller_frame->LookupDartFunction());
OS::Print(" -> Function %s\n", function.ToFullyQualifiedCString());
}
// Converts InstantiatedTypeArguments to TypeArguments and stores it
// into the instance. The assembly code can handle only type arguments of
// class TypeArguments. Because of the overhead, do it only when needed.
// Return false if the optimization was aborted.
// Set type_arguments_replaced to true if they have changed.
static bool OptimizeTypeArguments(const Instance& instance,
bool* type_arguments_replaced) {
*type_arguments_replaced = false;
const Class& type_class = Class::ZoneHandle(instance.clazz());
if (!type_class.HasTypeArguments()) {
return true;
}
AbstractTypeArguments& type_arguments =
AbstractTypeArguments::Handle(instance.GetTypeArguments());
if (type_arguments.IsNull()) {
return true;
}
if (type_arguments.IsInstantiatedTypeArguments()) {
do {
const InstantiatedTypeArguments& instantiated_type_arguments =
InstantiatedTypeArguments::Cast(type_arguments);
const AbstractTypeArguments& uninstantiated =
AbstractTypeArguments::Handle(
instantiated_type_arguments.uninstantiated_type_arguments());
const AbstractTypeArguments& instantiator =
AbstractTypeArguments::Handle(
instantiated_type_arguments.instantiator_type_arguments());
type_arguments = uninstantiated.InstantiateFrom(instantiator);
} while (type_arguments.IsInstantiatedTypeArguments());
AbstractTypeArguments& new_type_arguments = AbstractTypeArguments::Handle();
new_type_arguments = type_arguments.Canonicalize();
instance.SetTypeArguments(new_type_arguments);
*type_arguments_replaced = true;
} else if (!type_arguments.IsCanonical()) {
AbstractTypeArguments& new_type_arguments = AbstractTypeArguments::Handle();
new_type_arguments = type_arguments.Canonicalize();
instance.SetTypeArguments(new_type_arguments);
*type_arguments_replaced = true;
}
ASSERT(AbstractTypeArguments::Handle(
instance.GetTypeArguments()).IsTypeArguments());
return true;
}
// This updates the type test cache, an array containing 4-value elements
// (instance class, instance type arguments, instantiator type arguments and
// test_result). It can be applied to classes with type arguments in which
// case it contains just the result of the class subtype test, not including
// the evaluation of type arguments.
// This operation is currently very slow (lookup of code is not efficient yet).
// 'instantiator' can be null, in which case inst_targ
static void UpdateTypeTestCache(
const Instance& instance,
const AbstractType& type,
const Instance& instantiator,
const AbstractTypeArguments& incoming_instantiator_type_arguments,
const Bool& result,
const SubtypeTestCache& new_cache) {
// Since the test is expensive, don't do it unless necessary.
// The list of disallowed cases will decrease as they are implemented in
// inlined assembly.
if (new_cache.IsNull()) return;
// Instantiator type arguments may be canonicalized later.
AbstractTypeArguments& instantiator_type_arguments =
AbstractTypeArguments::Handle(incoming_instantiator_type_arguments.raw());
AbstractTypeArguments& instance_type_arguments =
AbstractTypeArguments::Handle();
const Class& instance_class = Class::Handle(instance.clazz());
// Canonicalize type arguments.
bool type_arguments_replaced = false;
if (instance_class.HasTypeArguments()) {
// Canonicalize type arguments.
if (!OptimizeTypeArguments(instance, &type_arguments_replaced)) {
if (FLAG_trace_type_checks) {
PrintTypeCheck("WARNING: Cannot canonicalize instance type arguments",
instance, type, instantiator_type_arguments, result);
}
return;
}
instance_type_arguments = instance.GetTypeArguments();
}
if (!instantiator.IsNull()) {
bool replaced = false;
if (!OptimizeTypeArguments(instantiator, &replaced)) {
if (FLAG_trace_type_checks) {
PrintTypeCheck("WARNING: Cannot canonicalize instantiator "
"type arguments",
instance, type, instantiator_type_arguments, result);
}
return;
}
if (replaced) {
type_arguments_replaced = true;
}
instantiator_type_arguments = instantiator.GetTypeArguments();
}
intptr_t last_instance_class_id = -1;
AbstractTypeArguments& last_instance_type_arguments =
AbstractTypeArguments::Handle();
AbstractTypeArguments& last_instantiator_type_arguments =
AbstractTypeArguments::Handle();
Bool& last_result = Bool::Handle();
intptr_t len = new_cache.NumberOfChecks();
for (intptr_t i = 0; i < len; ++i) {
new_cache.GetCheck(
i,
&last_instance_class_id,
&last_instance_type_arguments,
&last_instantiator_type_arguments,
&last_result);
if ((last_instance_class_id == instance_class.id()) &&
(last_instance_type_arguments.raw() == instance_type_arguments.raw()) &&
(last_instantiator_type_arguments.raw() ==
instantiator_type_arguments.raw())) {
if (FLAG_trace_type_checks) {
OS::Print("%"Pd" ", i);
if (type_arguments_replaced) {
PrintTypeCheck("Duplicate cache entry (canonical.)", instance, type,
instantiator_type_arguments, result);
} else {
PrintTypeCheck("WARNING Duplicate cache entry", instance, type,
instantiator_type_arguments, result);
}
}
// Can occur if we have canonicalized arguments.
// TODO(srdjan): Investigate why this assert can fail.
// ASSERT(type_arguments_replaced);
return;
}
}
new_cache.AddCheck(instance_class.id(),
instance_type_arguments,
instantiator_type_arguments,
result);
if (FLAG_trace_type_checks) {
AbstractType& test_type = AbstractType::Handle(type.raw());
if (!test_type.IsInstantiated()) {
test_type = type.InstantiateFrom(instantiator_type_arguments);
}
OS::Print(" Updated test cache %p ix:%"Pd":\n"
" [%p %s %"Pd", %p %s]\n"
" [%p %s %"Pd", %p %s] %s\n",
new_cache.raw(),
len,
instance_class.raw(),
instance_class.ToCString(),
instance_class.id(),
instance_type_arguments.raw(),
instance_type_arguments.ToCString(),
test_type.type_class(),
Class::Handle(test_type.type_class()).ToCString(),
Class::Handle(test_type.type_class()).id(),
instantiator_type_arguments.raw(),
instantiator_type_arguments.ToCString(),
result.ToCString());
}
}
// Check that the given instance is an instance of the given type.
// Tested instance may not be null, because the null test is inlined.
// Arg0: instance being checked.
// Arg1: type.
// Arg2: instantiator (or null).
// Arg3: type arguments of the instantiator of the type.
// Arg4: SubtypeTestCache.
// Return value: true or false, or may throw a type error in checked mode.
DEFINE_RUNTIME_ENTRY(Instanceof, 5) {
ASSERT(arguments.Count() == kInstanceofRuntimeEntry.argument_count());
const Instance& instance = Instance::CheckedHandle(arguments.At(0));
const AbstractType& type = AbstractType::CheckedHandle(arguments.At(1));
const Instance& instantiator = Instance::CheckedHandle(arguments.At(2));
const AbstractTypeArguments& instantiator_type_arguments =
AbstractTypeArguments::CheckedHandle(arguments.At(3));
const SubtypeTestCache& cache =
SubtypeTestCache::CheckedHandle(arguments.At(4));
ASSERT(type.IsFinalized());
Error& malformed_error = Error::Handle();
const Bool& result = Bool::Handle(
instance.IsInstanceOf(type,
instantiator_type_arguments,
&malformed_error) ?
Bool::True() : Bool::False());
if (FLAG_trace_type_checks) {
PrintTypeCheck("InstanceOf",
instance, type, instantiator_type_arguments, result);
}
if (!result.value() && !malformed_error.IsNull()) {
// Throw a dynamic type error only if the instanceof test fails.
const intptr_t location = GetCallerLocation();
String& malformed_error_message = String::Handle(
String::New(malformed_error.ToErrorCString()));
const String& no_name = String::Handle(Symbols::Empty());
Exceptions::CreateAndThrowTypeError(
location, no_name, no_name, no_name, malformed_error_message);
UNREACHABLE();
}
UpdateTypeTestCache(instance, type, instantiator,
instantiator_type_arguments, result, cache);
arguments.SetReturn(result);
}
// Check that the type of the given instance is a subtype of the given type and
// can therefore be assigned.
// Arg0: instance being assigned.
// Arg1: type being assigned to.
// Arg2: instantiator (or null).
// Arg3: type arguments of the instantiator of the type being assigned to.
// Arg4: name of variable being assigned to.
// Arg5: SubtypeTestCache.
// Return value: instance if a subtype, otherwise throw a TypeError.
DEFINE_RUNTIME_ENTRY(TypeCheck, 6) {
ASSERT(arguments.Count() == kTypeCheckRuntimeEntry.argument_count());
const Instance& src_instance = Instance::CheckedHandle(arguments.At(0));
const AbstractType& dst_type = AbstractType::CheckedHandle(arguments.At(1));
const Instance& dst_instantiator = Instance::CheckedHandle(arguments.At(2));
const AbstractTypeArguments& instantiator_type_arguments =
AbstractTypeArguments::CheckedHandle(arguments.At(3));
const String& dst_name = String::CheckedHandle(arguments.At(4));
const SubtypeTestCache& cache =
SubtypeTestCache::CheckedHandle(arguments.At(5));
ASSERT(!dst_type.IsDynamicType()); // No need to check assignment.
ASSERT(!dst_type.IsMalformed()); // Already checked in code generator.
ASSERT(!src_instance.IsNull()); // Already checked in inlined code.
Error& malformed_error = Error::Handle();
const bool is_instance_of = src_instance.IsInstanceOf(
dst_type, instantiator_type_arguments, &malformed_error);
if (FLAG_trace_type_checks) {
PrintTypeCheck("TypeCheck",
src_instance, dst_type, instantiator_type_arguments,
Bool::Handle(is_instance_of ? Bool::True() : Bool::False()));
}
if (!is_instance_of) {
// Throw a dynamic type error.
const intptr_t location = GetCallerLocation();
const AbstractType& src_type = AbstractType::Handle(src_instance.GetType());
const String& src_type_name = String::Handle(src_type.UserVisibleName());
String& dst_type_name = String::Handle();
if (!dst_type.IsInstantiated()) {
// Instantiate dst_type before reporting the error.
const AbstractType& instantiated_dst_type = AbstractType::Handle(
dst_type.InstantiateFrom(instantiator_type_arguments));
dst_type_name = instantiated_dst_type.UserVisibleName();
} else {
dst_type_name = dst_type.UserVisibleName();
}
String& malformed_error_message = String::Handle();
if (!malformed_error.IsNull()) {
ASSERT(FLAG_enable_type_checks);
malformed_error_message = String::New(malformed_error.ToErrorCString());
}
Exceptions::CreateAndThrowTypeError(location, src_type_name, dst_type_name,
dst_name, malformed_error_message);
UNREACHABLE();
}
UpdateTypeTestCache(src_instance, dst_type,
dst_instantiator, instantiator_type_arguments,
Bool::ZoneHandle(Bool::True()), cache);
arguments.SetReturn(src_instance);
}
// Test whether a formal parameter was defined by a passed-in argument.
// Arg0: formal parameter index as Smi.
// Arg1: formal parameter name as Symbol.
// Arg2: arguments descriptor array.
// Return value: true or false.
DEFINE_RUNTIME_ENTRY(ArgumentDefinitionTest, 3) {
ASSERT(arguments.Count() ==
kArgumentDefinitionTestRuntimeEntry.argument_count());
const Smi& param_index = Smi::CheckedHandle(arguments.At(0));
const String& param_name = String::CheckedHandle(arguments.At(1));
ASSERT(param_name.IsSymbol());
const Array& arg_desc = Array::CheckedHandle(arguments.At(2));
const intptr_t num_pos_args = Smi::CheckedHandle(arg_desc.At(1)).Value();
// Check if the formal parameter is defined by a positional argument.
bool is_defined = num_pos_args > param_index.Value();
if (!is_defined) {
// Check if the formal parameter is defined by a named argument.
const intptr_t num_named_args =
Smi::CheckedHandle(arg_desc.At(0)).Value() - num_pos_args;
String& arg_name = String::Handle();
for (intptr_t i = 0; i < num_named_args; i++) {
arg_name ^= arg_desc.At(2*i + 2);
if (arg_name.raw() == param_name.raw()) {
is_defined = true;
break;
}
}
}
arguments.SetReturn(Bool::Handle(Bool::Get(is_defined)));
}
// Report that the type of the given object is not bool in conditional context.
// Arg0: bad object.
// Return value: none, throws a TypeError.
DEFINE_RUNTIME_ENTRY(ConditionTypeError, 1) {
ASSERT(arguments.Count() ==
kConditionTypeErrorRuntimeEntry.argument_count());
const intptr_t location = GetCallerLocation();
const Instance& src_instance = Instance::CheckedHandle(arguments.At(0));
ASSERT(src_instance.IsNull() || !src_instance.IsBool());
const Type& bool_interface = Type::Handle(Type::BoolType());
const AbstractType& src_type = AbstractType::Handle(src_instance.GetType());
const String& src_type_name = String::Handle(src_type.UserVisibleName());
const String& bool_type_name =
String::Handle(bool_interface.UserVisibleName());
const String& expr = String::Handle(Symbols::New("boolean expression"));
const String& no_malformed_type_error = String::Handle();
Exceptions::CreateAndThrowTypeError(location, src_type_name, bool_type_name,
expr, no_malformed_type_error);
UNREACHABLE();
}
// Report that the type of the type check is malformed.
// Arg0: src value.
// Arg1: name of instance being assigned to.
// Arg2: malformed type error message.
// Return value: none, throws an exception.
DEFINE_RUNTIME_ENTRY(MalformedTypeError, 3) {
ASSERT(arguments.Count() ==
kMalformedTypeErrorRuntimeEntry.argument_count());
const intptr_t location = GetCallerLocation();
const Instance& src_value = Instance::CheckedHandle(arguments.At(0));
const String& dst_name = String::CheckedHandle(arguments.At(1));
const String& malformed_error = String::CheckedHandle(arguments.At(2));
const String& dst_type_name = String::Handle(Symbols::New("malformed"));
const AbstractType& src_type = AbstractType::Handle(src_value.GetType());
const String& src_type_name = String::Handle(src_type.UserVisibleName());
Exceptions::CreateAndThrowTypeError(location, src_type_name,
dst_type_name, dst_name, malformed_error);
UNREACHABLE();
}
DEFINE_RUNTIME_ENTRY(Throw, 1) {
ASSERT(arguments.Count() == kThrowRuntimeEntry.argument_count());
const Instance& exception = Instance::CheckedHandle(arguments.At(0));
Exceptions::Throw(exception);
}
DEFINE_RUNTIME_ENTRY(ReThrow, 2) {
ASSERT(arguments.Count() == kReThrowRuntimeEntry.argument_count());
const Instance& exception = Instance::CheckedHandle(arguments.At(0));
const Instance& stacktrace = Instance::CheckedHandle(arguments.At(1));
Exceptions::ReThrow(exception, stacktrace);
}
DEFINE_RUNTIME_ENTRY(PatchStaticCall, 0) {
// This function is called after successful resolving and compilation of
// the target method.
ASSERT(arguments.Count() == kPatchStaticCallRuntimeEntry.argument_count());
DartFrameIterator iterator;
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
uword target = 0;
Function& target_function = Function::Handle();
CodePatcher::GetStaticCallAt(caller_frame->pc(), &target_function, &target);
ASSERT(target_function.HasCode());
uword new_target = Code::Handle(target_function.CurrentCode()).EntryPoint();
// Verify that we are not patching repeatedly.
ASSERT(target != new_target);
CodePatcher::PatchStaticCallAt(caller_frame->pc(), new_target);
if (FLAG_trace_patching) {
OS::Print("PatchStaticCall: patching from %#"Px" to '%s' %#"Px"\n",
caller_frame->pc(),
target_function.ToFullyQualifiedCString(),
new_target);
}
}
// Resolves and compiles the target function of an instance call, updates
// function cache of the receiver's class and returns the compiled code or null.
// Only the number of named arguments is checked, but not the actual names.
RawCode* ResolveCompileInstanceCallTarget(Isolate* isolate,
const Instance& receiver) {
int num_arguments = -1;
int num_named_arguments = -1;
uword target = 0;
String& function_name = String::Handle();
DartFrameIterator iterator;
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
CodePatcher::GetInstanceCallAt(caller_frame->pc(),
&function_name,
&num_arguments,
&num_named_arguments,
&target);
ASSERT(function_name.IsSymbol());
Function& function = Function::Handle();
function = Resolver::ResolveDynamic(receiver,
function_name,
num_arguments,
num_named_arguments);
if (function.IsNull()) {
return Code::null();
} else {
if (!function.HasCode()) {
const Error& error = Error::Handle(Compiler::CompileFunction(function));
if (!error.IsNull()) {
Exceptions::PropagateError(error);
}
}
return function.CurrentCode();
}
}
// Result of an invoke may be an unhandled exception, in which case we
// rethrow it.
static void CheckResultError(const Object& result) {
if (result.IsError()) {
Exceptions::PropagateError(Error::Cast(result));
}
}
// Resolves an instance function and compiles it if necessary.
// Arg0: receiver object.
// Returns: RawCode object or NULL (method not found or not compileable).
// This is called by the megamorphic stub when instance call does not need to be
// patched.
// Used by megamorphic lookup/no-such-method-handling.
DEFINE_RUNTIME_ENTRY(ResolveCompileInstanceFunction, 1) {
ASSERT(arguments.Count() ==
kResolveCompileInstanceFunctionRuntimeEntry.argument_count());
const Instance& receiver = Instance::CheckedHandle(arguments.At(0));
const Code& code = Code::Handle(
ResolveCompileInstanceCallTarget(isolate, receiver));
arguments.SetReturn(code);
}
// Gets called from debug stub when code reaches a breakpoint.
// Arg0: function object of the static function that was about to be called.
DEFINE_RUNTIME_ENTRY(BreakpointStaticHandler, 1) {
ASSERT(arguments.Count() ==
kBreakpointStaticHandlerRuntimeEntry.argument_count());
ASSERT(isolate->debugger() != NULL);
isolate->debugger()->SignalBpReached();
// Make sure the static function that is about to be called is
// compiled. The stub will jump to the entry point without any
// further tests.
const Function& function = Function::CheckedHandle(arguments.At(0));
if (!function.HasCode()) {
const Error& error = Error::Handle(Compiler::CompileFunction(function));
if (!error.IsNull()) {
Exceptions::PropagateError(error);
}
}
}
// Gets called from debug stub when code reaches a breakpoint at a return
// in Dart code.
DEFINE_RUNTIME_ENTRY(BreakpointReturnHandler, 0) {
ASSERT(arguments.Count() ==
kBreakpointReturnHandlerRuntimeEntry.argument_count());
ASSERT(isolate->debugger() != NULL);
isolate->debugger()->SignalBpReached();
}
// Gets called from debug stub when code reaches a breakpoint.
DEFINE_RUNTIME_ENTRY(BreakpointDynamicHandler, 0) {
ASSERT(arguments.Count() ==
kBreakpointDynamicHandlerRuntimeEntry.argument_count());
ASSERT(isolate->debugger() != NULL);
isolate->debugger()->SignalBpReached();
}
static RawFunction* InlineCacheMissHandler(
Isolate* isolate, const GrowableArray<const Instance*>& args) {
const Instance& receiver = *args[0];
const Code& target_code =
Code::Handle(ResolveCompileInstanceCallTarget(isolate, receiver));
if (target_code.IsNull()) {
// Let the megamorphic stub handle special cases: NoSuchMethod,
// closure calls.
if (FLAG_trace_ic) {
OS::Print("InlineCacheMissHandler NULL code for receiver: %s\n",
receiver.ToCString());
}
return Function::null();
}
const Function& target_function =
Function::Handle(target_code.function());
ASSERT(!target_function.IsNull());
DartFrameIterator iterator;
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
ICData& ic_data = ICData::Handle(
CodePatcher::GetInstanceCallIcDataAt(caller_frame->pc()));
if (args.length() == 1) {
ic_data.AddReceiverCheck(Class::Handle(args[0]->clazz()).id(),
target_function);
} else {
GrowableArray<intptr_t> class_ids(args.length());
ASSERT(ic_data.num_args_tested() == args.length());
for (intptr_t i = 0; i < args.length(); i++) {
class_ids.Add(Class::Handle(args[i]->clazz()).id());
}
ic_data.AddCheck(class_ids, target_function);
}
if (FLAG_trace_ic_miss_in_optimized) {
const Code& caller = Code::Handle(Code::LookupCode(caller_frame->pc()));
if (caller.is_optimized()) {
OS::Print("IC miss in optimized code; call %s -> %s\n",
Function::Handle(caller.function()).ToCString(),
target_function.ToCString());
}
}
if (FLAG_trace_ic) {
OS::Print("InlineCacheMissHandler %d call at %#"Px"' "
"adding <%s> id:%"Pd" -> <%s>\n",
args.length(),
caller_frame->pc(),
Class::Handle(receiver.clazz()).ToCString(),
Class::Handle(receiver.clazz()).id(),
target_function.ToCString());
}
return target_function.raw();
}
// Handles inline cache misses by updating the IC data array of the call
// site.
// Arg0: Receiver object.
// Returns: target function with compiled code or null.
// Modifies the instance call to hold the updated IC data array.
DEFINE_RUNTIME_ENTRY(InlineCacheMissHandlerOneArg, 1) {
ASSERT(arguments.Count() ==
kInlineCacheMissHandlerOneArgRuntimeEntry.argument_count());
const Instance& receiver = Instance::CheckedHandle(arguments.At(0));
GrowableArray<const Instance*> args(1);
args.Add(&receiver);
const Function& result =
Function::Handle(InlineCacheMissHandler(isolate, args));
arguments.SetReturn(result);
}
// Handles inline cache misses by updating the IC data array of the call
// site.
// Arg0: Receiver object.
// Arg1: Argument after receiver.
// Returns: target function with compiled code or null.
// Modifies the instance call to hold the updated IC data array.
DEFINE_RUNTIME_ENTRY(InlineCacheMissHandlerTwoArgs, 2) {
ASSERT(arguments.Count() ==
kInlineCacheMissHandlerTwoArgsRuntimeEntry.argument_count());
const Instance& receiver = Instance::CheckedHandle(arguments.At(0));
const Instance& other = Instance::CheckedHandle(arguments.At(1));
GrowableArray<const Instance*> args(2);
args.Add(&receiver);
args.Add(&other);
const Function& result =
Function::Handle(InlineCacheMissHandler(isolate, args));
arguments.SetReturn(result);
}
// Handles inline cache misses by updating the IC data array of the call
// site.
// Arg0: Receiver object.
// Arg1: Argument after receiver.
// Arg2: Second argument after receiver.
// Returns: target function with compiled code or null.
// Modifies the instance call to hold the updated IC data array.
DEFINE_RUNTIME_ENTRY(InlineCacheMissHandlerThreeArgs, 3) {
ASSERT(arguments.Count() ==
kInlineCacheMissHandlerThreeArgsRuntimeEntry.argument_count());
const Instance& receiver = Instance::CheckedHandle(arguments.At(0));
const Instance& arg1 = Instance::CheckedHandle(arguments.At(1));
const Instance& arg2 = Instance::CheckedHandle(arguments.At(2));
GrowableArray<const Instance*> args(3);
args.Add(&receiver);
args.Add(&arg1);
args.Add(&arg2);
const Function& result =
Function::Handle(InlineCacheMissHandler(isolate, args));
arguments.SetReturn(result);
}
// Updates IC data for two arguments. Used by the equality operation when
// the control flow bypasses regular inline cache (null arguments).
// Arg0: Receiver object.
// Arg1: Argument after receiver.
// Arg2: Target's name.
// Arg3: ICData.
DEFINE_RUNTIME_ENTRY(UpdateICDataTwoArgs, 4) {
ASSERT(arguments.Count() ==
kUpdateICDataTwoArgsRuntimeEntry.argument_count());
const Instance& receiver = Instance::CheckedHandle(arguments.At(0));
const Instance& arg1 = Instance::CheckedHandle(arguments.At(1));
const String& target_name = String::CheckedHandle(arguments.At(2));
const ICData& ic_data = ICData::CheckedHandle(arguments.At(3));
GrowableArray<const Instance*> args(2);
args.Add(&receiver);
args.Add(&arg1);
const intptr_t kNumArguments = 2;
const intptr_t kNumNamedArguments = 0;
Function& target_function = Function::Handle();
target_function = Resolver::ResolveDynamic(receiver,
target_name,
kNumArguments,
kNumNamedArguments);
ASSERT(!target_function.IsNull());
GrowableArray<intptr_t> class_ids(kNumArguments);
ASSERT(ic_data.num_args_tested() == kNumArguments);
class_ids.Add(Class::Handle(receiver.clazz()).id());
class_ids.Add(Class::Handle(arg1.clazz()).id());
ic_data.AddCheck(class_ids, target_function);
}
static RawFunction* LookupDynamicFunction(Isolate* isolate,
const Class& in_cls,
const String& name) {
Class& cls = Class::Handle();
// For lookups treat null as an instance of class Object.
if (in_cls.IsNullClass()) {
cls = isolate->object_store()->object_class();
} else {
cls = in_cls.raw();
}
Function& function = Function::Handle();
while (!cls.IsNull()) {
// Check if function exists.
function = cls.LookupDynamicFunction(name);
if (!function.IsNull()) {
break;
}
cls = cls.SuperClass();
}
return function.raw();
}
// Resolve an implicit closure by checking if an instance function
// of the same name exists and creating a closure object of the function.
// Arg0: receiver object.
// Arg1: ic-data.
// Returns: Closure object or NULL (instance function not found).
// This is called by the megamorphic stub when it is unable to resolve an
// instance method. This is done just before the call to noSuchMethod.
DEFINE_RUNTIME_ENTRY(ResolveImplicitClosureFunction, 2) {
ASSERT(arguments.Count() ==
kResolveImplicitClosureFunctionRuntimeEntry.argument_count());
const Instance& receiver = Instance::CheckedHandle(arguments.At(0));
const ICData& ic_data = ICData::CheckedHandle(arguments.At(1));
const String& original_function_name = String::Handle(ic_data.target_name());
Instance& closure = Instance::Handle();
if (!Field::IsGetterName(original_function_name)) {
// This is not a getter so can't be the case where we are trying to
// create an implicit closure of an instance function.
arguments.SetReturn(closure);
return;
}
const Class& receiver_class = Class::Handle(receiver.clazz());
ASSERT(!receiver_class.IsNull());
String& func_name = String::Handle();
func_name = Field::NameFromGetter(original_function_name);
func_name = Symbols::New(func_name);
const Function& function = Function::Handle(
LookupDynamicFunction(isolate, receiver_class, func_name));
if (function.IsNull()) {
// There is no function of the same name so can't be the case where
// we are trying to create an implicit closure of an instance function.
arguments.SetReturn(closure);
return;
}
Function& implicit_closure_function =
Function::Handle(function.ImplicitClosureFunction());
// Create a closure object for the implicit closure function.
const Context& context = Context::Handle(Context::New(1));
context.SetAt(0, receiver);
closure = Closure::New(implicit_closure_function, context);
if (receiver_class.HasTypeArguments()) {
const AbstractTypeArguments& type_arguments =
AbstractTypeArguments::Handle(receiver.GetTypeArguments());
closure.SetTypeArguments(type_arguments);
}
arguments.SetReturn(closure);
}
// Resolve an implicit closure by invoking getter and checking if the return
// value from getter is a closure.
// Arg0: receiver object.
// Arg1: ic-data.
// Returns: Closure object or NULL (closure not found).
// This is called by the megamorphic stub when it is unable to resolve an
// instance method. This is done just before the call to noSuchMethod.
DEFINE_RUNTIME_ENTRY(ResolveImplicitClosureThroughGetter, 2) {
ASSERT(arguments.Count() ==
kResolveImplicitClosureThroughGetterRuntimeEntry.argument_count());
const Instance& receiver = Instance::CheckedHandle(arguments.At(0));
const ICData& ic_data = ICData::CheckedHandle(arguments.At(1));
const String& original_function_name = String::Handle(ic_data.target_name());
const int kNumArguments = 1;
const int kNumNamedArguments = 0;
const String& getter_function_name =
String::Handle(Field::GetterName(original_function_name));
Function& function = Function::ZoneHandle(
Resolver::ResolveDynamic(receiver,
getter_function_name,
kNumArguments,
kNumNamedArguments));
Code& code = Code::Handle();
if (function.IsNull()) {
arguments.SetReturn(code);
return; // No getter function found so can't be an implicit closure.
}
GrowableArray<const Object*> invoke_arguments(0);
const Array& kNoArgumentNames = Array::Handle();
const Object& result =
Object::Handle(DartEntry::InvokeDynamic(receiver,
function,
invoke_arguments,
kNoArgumentNames));
if (result.IsError()) {
if (result.IsUnhandledException()) {
// If the getter throws an exception, treat as no such method.
arguments.SetReturn(code);
return;
} else {
Exceptions::PropagateError(Error::Cast(result));
}
}
if (!result.IsSmi()) {
const Class& cls = Class::Handle(result.clazz());
ASSERT(!cls.IsNull());
function = cls.signature_function();
if (!function.IsNull()) {
arguments.SetReturn(result);
return; // Return closure object.
}
}
Exceptions::ThrowByType(Exceptions::kObjectNotClosure, invoke_arguments);
}
// Invoke Implicit Closure function.
// Arg0: closure object.
// Arg1: arguments descriptor (originally passed as dart instance invocation).
// Arg2: arguments array (originally passed to dart instance invocation).
DEFINE_RUNTIME_ENTRY(InvokeImplicitClosureFunction, 3) {
ASSERT(arguments.Count() ==
kInvokeImplicitClosureFunctionRuntimeEntry.argument_count());
const Instance& closure = Instance::CheckedHandle(arguments.At(0));
const Array& arg_descriptor = Array::CheckedHandle(arguments.At(1));
const Array& func_arguments = Array::CheckedHandle(arguments.At(2));
const Function& function = Function::Handle(Closure::function(closure));
ASSERT(!function.IsNull());
if (!function.HasCode()) {
const Error& error = Error::Handle(Compiler::CompileFunction(function));
if (!error.IsNull()) {
Exceptions::PropagateError(error);
}
}
const Context& context = Context::Handle(Closure::context(closure));
const Code& code = Code::Handle(function.CurrentCode());
ASSERT(!code.IsNull());
const Instructions& instrs = Instructions::Handle(code.instructions());
ASSERT(!instrs.IsNull());
// Adjust arguments descriptor array to account for removal of the receiver
// parameter. Since the arguments descriptor array is canonicalized, create a
// new one instead of patching the original one.
const intptr_t len = arg_descriptor.Length();
const intptr_t num_named_args = (len - 3) / 2;
const Array& adjusted_arg_descriptor = Array::Handle(Array::New(len));
Smi& smi = Smi::Handle();
smi ^= arg_descriptor.At(0); // Get argument length.
smi = Smi::New(smi.Value() - 1); // Adjust argument length.
ASSERT(smi.Value() == func_arguments.Length());
adjusted_arg_descriptor.SetAt(0, smi);
smi ^= arg_descriptor.At(1); // Get number of positional parameters.
smi = Smi::New(smi.Value() - 1); // Adjust number of positional params.
adjusted_arg_descriptor.SetAt(1, smi);
// Adjust name/position pairs for each named argument.
String& named_arg_name = String::Handle();
Smi& named_arg_pos = Smi::Handle();
for (intptr_t i = 0; i < num_named_args; i++) {
const int index = 2 + (2 * i);
named_arg_name ^= arg_descriptor.At(index);
ASSERT(named_arg_name.IsSymbol());
adjusted_arg_descriptor.SetAt(index, named_arg_name);
named_arg_pos ^= arg_descriptor.At(index + 1);
named_arg_pos = Smi::New(named_arg_pos.Value() - 1);
adjusted_arg_descriptor.SetAt(index + 1, named_arg_pos);
}
adjusted_arg_descriptor.SetAt(len - 1, Object::Handle(Object::null()));
// It is too late to share the descriptor by canonicalizing it. However, it is
// important that the argument names are canonicalized (i.e. are symbols).
// Receiver parameter has already been skipped by caller.
GrowableArray<const Object*> invoke_arguments(0);
for (intptr_t i = 0; i < func_arguments.Length(); i++) {
const Object& value = Object::Handle(func_arguments.At(i));
invoke_arguments.Add(&value);
}
// Now Call the invoke stub which will invoke the closure.
DartEntry::invokestub entrypoint = reinterpret_cast<DartEntry::invokestub>(
StubCode::InvokeDartCodeEntryPoint());
ASSERT(context.isolate() == Isolate::Current());
const Object& result = Object::Handle(
entrypoint(instrs.EntryPoint(),
adjusted_arg_descriptor,
invoke_arguments.data(),
context));
CheckResultError(result);
arguments.SetReturn(result);
}
// Invoke appropriate noSuchMethod function.
// Arg0: receiver.
// Arg1: ic-data.
// Arg2: original arguments descriptor array.
// Arg3: original arguments array.
DEFINE_RUNTIME_ENTRY(InvokeNoSuchMethodFunction, 4) {
ASSERT(arguments.Count() ==
kInvokeNoSuchMethodFunctionRuntimeEntry.argument_count());
const Instance& receiver = Instance::CheckedHandle(arguments.At(0));
const ICData& ic_data = ICData::CheckedHandle(arguments.At(1));
const String& original_function_name = String::Handle(ic_data.target_name());
ASSERT(!Array::CheckedHandle(arguments.At(2)).IsNull());
const Array& orig_arguments = Array::CheckedHandle(arguments.At(3));
// TODO(regis): The signature of the "noSuchMethod" method has to change from
// noSuchMethod(String name, Array arguments) to something like
// noSuchMethod(InvocationMirror call).
const int kNumArguments = 3;
const int kNumNamedArguments = 0;
const Array& kNoArgumentNames = Array::Handle();
const String& function_name =
String::Handle(Symbols::NoSuchMethod());
const Function& function = Function::ZoneHandle(
Resolver::ResolveDynamic(receiver,
function_name,
kNumArguments,
kNumNamedArguments));
ASSERT(!function.IsNull());
GrowableArray<const Object*> invoke_arguments(2);
invoke_arguments.Add(&original_function_name);
invoke_arguments.Add(&orig_arguments);
const Object& result = Object::Handle(
DartEntry::InvokeDynamic(receiver,
function,
invoke_arguments,
kNoArgumentNames));
CheckResultError(result);
arguments.SetReturn(result);
}
// Report that an object is not a closure.
// Arg0: non-closure object.
// Arg1: arguments array.
DEFINE_RUNTIME_ENTRY(ReportObjectNotClosure, 2) {
ASSERT(arguments.Count() ==
kReportObjectNotClosureRuntimeEntry.argument_count());
const Instance& bad_closure = Instance::CheckedHandle(arguments.At(0));
if (bad_closure.IsNull()) {
GrowableArray<const Object*> args;
Exceptions::ThrowByType(Exceptions::kObjectNotClosure, args);
}
GrowableArray<const Object*> args;
Exceptions::ThrowByType(Exceptions::kObjectNotClosure, args);
}
DEFINE_RUNTIME_ENTRY(ClosureArgumentMismatch, 0) {
ASSERT(arguments.Count() ==
kClosureArgumentMismatchRuntimeEntry.argument_count());
GrowableArray<const Object*> args;
Exceptions::ThrowByType(Exceptions::kClosureArgumentMismatch, args);
}
DEFINE_RUNTIME_ENTRY(StackOverflow, 0) {
ASSERT(arguments.Count() ==
kStackOverflowRuntimeEntry.argument_count());
uword stack_pos = reinterpret_cast<uword>(&arguments);
// If an interrupt happens at the same time as a stack overflow, we
// process the stack overflow first.
if (stack_pos < isolate->saved_stack_limit()) {
// Use the preallocated stack overflow exception to avoid calling
// into dart code.
const Instance& exception =
Instance::Handle(isolate->object_store()->stack_overflow());
Exceptions::Throw(exception);
UNREACHABLE();
}
uword interrupt_bits = isolate->GetAndClearInterrupts();
if (interrupt_bits & Isolate::kStoreBufferInterrupt) {
if (FLAG_verbose_gc) {
OS::PrintErr("Scavenge scheduled by store buffer overflow.\n");
}
isolate->heap()->CollectGarbage(Heap::kNew);
}
if (interrupt_bits & Isolate::kMessageInterrupt) {
isolate->message_handler()->HandleOOBMessages();
}
if (interrupt_bits & Isolate::kApiInterrupt) {
// Signal isolate interrupt event.
Debugger::SignalIsolateEvent(Debugger::kIsolateInterrupted);
Dart_IsolateInterruptCallback callback = isolate->InterruptCallback();
if (callback) {
if ((*callback)()) {
return;
} else {
// TODO(turnidge): Unwind the stack.
UNIMPLEMENTED();
}
}
}
}
static void PrintCaller(const char* msg) {
DartFrameIterator iterator;
StackFrame* top_frame = iterator.NextFrame();
ASSERT(top_frame != NULL);
const Function& top_function = Function::Handle(
top_frame->LookupDartFunction());
OS::Print("Failed: '%s' %s @ %#"Px"\n",
msg, top_function.ToFullyQualifiedCString(), top_frame->pc());
StackFrame* caller_frame = iterator.NextFrame();
if (caller_frame != NULL) {
const Function& caller_function = Function::Handle(
caller_frame->LookupDartFunction());
const Code& code = Code::Handle(caller_frame->LookupDartCode());
OS::Print(" -> caller: %s (%s)\n",
caller_function.ToFullyQualifiedCString(),
code.is_optimized() ? "optimized" : "unoptimized");
}
}
// Only unoptimized code has invocation counter threshold checking.
// Once the invocation counter threshold is reached any entry into the
// unoptimized code is redirected to this function.
DEFINE_RUNTIME_ENTRY(OptimizeInvokedFunction, 1) {
const intptr_t kLowInvocationCount = -100000000;
ASSERT(arguments.Count() ==
kOptimizeInvokedFunctionRuntimeEntry.argument_count());
const Function& function = Function::CheckedHandle(arguments.At(0));
if (isolate->debugger()->IsActive()) {
// We cannot set breakpoints in optimized code, so do not optimize
// the function.
function.set_usage_counter(0);
return;
}
if (function.deoptimization_counter() >=
FLAG_deoptimization_counter_threshold) {
if (FLAG_trace_failed_optimization_attempts) {
PrintCaller("Too Many Deoptimizations");
}
// TODO(srdjan): Investigate excessive deoptimization.
function.set_usage_counter(kLowInvocationCount);
return;
}
if (function.HasOptimizedCode()) {
// The caller has been already optimized, the caller is probably in
// a loop or in a recursive call chain.
// Leave the usage_counter at the limit so that the count test knows that
// method is optimized.
if (FLAG_trace_failed_optimization_attempts) {
PrintCaller("Has Optimized Code");
}
// TODO(srdjan): Enable reoptimizing optimized code, but most recognize
// that reoptimization was not already applied.
return;
}
if ((FLAG_optimization_filter != NULL) &&
(strstr(function.ToFullyQualifiedCString(),
FLAG_optimization_filter) == NULL)) {
function.set_usage_counter(kLowInvocationCount);
return;
}
if (function.is_optimizable()) {
// Compilation patches the entry of unoptimized code.
ASSERT(!function.HasOptimizedCode());
const Error& error =
Error::Handle(Compiler::CompileOptimizedFunction(function));
if (!error.IsNull()) {
Exceptions::PropagateError(error);
}
const Code& optimized_code = Code::Handle(function.CurrentCode());
ASSERT(!optimized_code.IsNull());
function.set_usage_counter(0);
} else {
if (FLAG_trace_failed_optimization_attempts) {
PrintCaller("Not Optimizable");
}
// TODO(5442338): Abort as this should not happen.
function.set_usage_counter(kLowInvocationCount);
}
}
// The caller must be a static call in a Dart frame, or an entry frame.
// Patch static call to point to 'new_entry_point'.
DEFINE_RUNTIME_ENTRY(FixCallersTarget, 1) {
ASSERT(arguments.Count() == kFixCallersTargetRuntimeEntry.argument_count());
const Function& function = Function::CheckedHandle(arguments.At(0));
ASSERT(!function.IsNull());
ASSERT(function.HasCode());
StackFrameIterator iterator(StackFrameIterator::kDontValidateFrames);
StackFrame* frame = iterator.NextFrame();
while (frame != NULL && (frame->IsStubFrame() || frame->IsExitFrame())) {
frame = iterator.NextFrame();
}
ASSERT(frame != NULL);
if (!frame->IsEntryFrame()) {
ASSERT(frame->IsDartFrame());
uword target = 0;
Function& target_function = Function::Handle();
CodePatcher::GetStaticCallAt(frame->pc(), &target_function, &target);
ASSERT(target_function.HasCode());
const uword new_entry_point =
Code::Handle(function.CurrentCode()).EntryPoint();
ASSERT(target != new_entry_point); // Why patch otherwise.
CodePatcher::PatchStaticCallAt(frame->pc(), new_entry_point);
if (FLAG_trace_patching) {
OS::Print("FixCallersTarget: patching from %#"Px" to '%s' %#"Px"\n",
frame->pc(),
target_function.ToFullyQualifiedCString(),
new_entry_point);
}
}
}
const char* DeoptReasonToText(intptr_t deopt_id) {
switch (deopt_id) {
#define DEOPT_REASON_ID_TO_TEXT(name) case kDeopt##name: return #name;
DEOPT_REASONS(DEOPT_REASON_ID_TO_TEXT)
#undef DEOPT_REASON_ID_TO_TEXT
default:
UNREACHABLE();
return "";
}
}
static void GetDeoptInfoAtPc(const Code& code,
uword pc,
DeoptInfo* deopt_info,
DeoptReasonId* deopt_reason) {
ASSERT(code.is_optimized());
const Instructions& instructions = Instructions::Handle(code.instructions());
uword code_entry = instructions.EntryPoint();
const Array& table = Array::Handle(code.deopt_info_array());
ASSERT(!table.IsNull());
// Linear search for the PC offset matching the target PC.
intptr_t length = DeoptTable::GetLength(table);
Smi& offset = Smi::Handle();
Smi& reason = Smi::Handle();
for (intptr_t i = 0; i < length; ++i) {
DeoptTable::GetEntry(table, i, &offset, deopt_info, &reason);
if (pc == (code_entry + offset.Value())) {
*deopt_reason = static_cast<DeoptReasonId>(reason.Value());
return;
}
}
*deopt_info = DeoptInfo::null();
*deopt_reason = kDeoptUnknown;
}
// Currently checks only that all optimized frames have kDeoptIndex
// and unoptimized code has the kDeoptAfter.
void DeoptimizeAll() {
DartFrameIterator iterator;
StackFrame* frame = iterator.NextFrame();
Code& optimized_code = Code::Handle();
Function& function = Function::Handle();
Code& unoptimized_code = Code::Handle();
while (frame != NULL) {
optimized_code = frame->LookupDartCode();
if (optimized_code.is_optimized()) {
DeoptInfo& deopt_info = DeoptInfo::Handle();
DeoptReasonId deopt_reason = kDeoptUnknown;
GetDeoptInfoAtPc(optimized_code, frame->pc(), &deopt_info, &deopt_reason);
ASSERT(!deopt_info.IsNull());
function = optimized_code.function();
unoptimized_code = function.unoptimized_code();
ASSERT(!unoptimized_code.IsNull());
// The switch to unoptimized code may have already occured.
if (function.HasOptimizedCode()) {
function.SwitchToUnoptimizedCode();
}
// Patch call site (lazy deoptimization is quite rare, patching it twice
// is not a performance issue).
uword lazy_deopt_jump = optimized_code.GetLazyDeoptPc();
ASSERT(lazy_deopt_jump != 0);
CodePatcher::InsertCallAt(frame->pc(), lazy_deopt_jump);
// Mark code as dead (do not GC its embedded objects).
optimized_code.set_is_alive(false);
}
frame = iterator.NextFrame();
}
}
// Copy saved registers into the isolate buffer.
static void CopySavedRegisters(uword saved_registers_address) {
double* xmm_registers_copy = new double[kNumberOfXmmRegisters];
ASSERT(xmm_registers_copy != NULL);
for (intptr_t i = 0; i < kNumberOfXmmRegisters; i++) {
xmm_registers_copy[i] = *reinterpret_cast<double*>(saved_registers_address);
saved_registers_address += kDoubleSize;
}
Isolate::Current()->set_deopt_xmm_registers_copy(xmm_registers_copy);
intptr_t* cpu_registers_copy = new intptr_t[kNumberOfCpuRegisters];
ASSERT(cpu_registers_copy != NULL);
for (intptr_t i = 0; i < kNumberOfCpuRegisters; i++) {
cpu_registers_copy[i] =
*reinterpret_cast<intptr_t*>(saved_registers_address);
saved_registers_address += kWordSize;
}
Isolate::Current()->set_deopt_cpu_registers_copy(cpu_registers_copy);
}
// Copy optimized frame into the isolate buffer.
// The first incoming argument is stored at the last entry in the
// copied frame buffer.
static void CopyFrame(const Code& optimized_code, const StackFrame& frame) {
const Function& function = Function::Handle(optimized_code.function());
// Do not copy incoming arguments if there are optional arguments (they
// are copied into local space at method entry).
const intptr_t num_args =
function.HasOptionalParameters() ? 0 : function.num_fixed_parameters();
// FP, PC-marker and return-address will be copied as well.
const intptr_t frame_copy_size =
1 // Deoptimized function's return address: caller_frame->pc().
+ ((frame.fp() - frame.sp()) / kWordSize)
+ 1 // PC marker.
+ 1 // Caller return address.
+ num_args;
intptr_t* frame_copy = new intptr_t[frame_copy_size];
ASSERT(frame_copy != NULL);
// Include the return address of optimized code.
intptr_t* start = reinterpret_cast<intptr_t*>(frame.sp() - kWordSize);
for (intptr_t i = 0; i < frame_copy_size; i++) {
frame_copy[i] = *(start + i);
}
Isolate::Current()->SetDeoptFrameCopy(frame_copy, frame_copy_size);
}
// Copies saved registers and caller's frame into temporary buffers.
// Returns the stack size of unoptimized frame.
DEFINE_LEAF_RUNTIME_ENTRY(intptr_t, DeoptimizeCopyFrame,
uword saved_registers_address) {
Isolate* isolate = Isolate::Current();
StackZone zone(isolate);
HANDLESCOPE(isolate);
// All registers have been saved below last-fp.
const uword last_fp = saved_registers_address +
kNumberOfCpuRegisters * kWordSize + kNumberOfXmmRegisters * kDoubleSize;
CopySavedRegisters(saved_registers_address);
// Get optimized code and frame that need to be deoptimized.
DartFrameIterator iterator(last_fp);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
const Code& optimized_code = Code::Handle(caller_frame->LookupDartCode());
ASSERT(optimized_code.is_optimized());
DeoptInfo& deopt_info = DeoptInfo::Handle();
DeoptReasonId deopt_reason = kDeoptUnknown;
GetDeoptInfoAtPc(optimized_code, caller_frame->pc(), &deopt_info,
&deopt_reason);
ASSERT(!deopt_info.IsNull());
CopyFrame(optimized_code, *caller_frame);
if (FLAG_trace_deoptimization) {
Function& function = Function::Handle(optimized_code.function());
OS::Print("Deoptimizing (reason %d '%s') at pc %#"Px" '%s' (count %d)\n",
deopt_reason,
DeoptReasonToText(deopt_reason),
caller_frame->pc(),
function.ToFullyQualifiedCString(),
function.deoptimization_counter());
}
// Compute the stack size of the unoptimized frame. For functions with
// optional arguments the deoptimization info does not describe the
// incoming arguments.
const Function& function = Function::Handle(optimized_code.function());
const intptr_t num_args =
function.HasOptionalParameters() ? 0 : function.num_fixed_parameters();
intptr_t unoptimized_stack_size =
+ deopt_info.Length() - num_args
- 2; // Subtract caller FP and PC.
return unoptimized_stack_size * kWordSize;
}
END_LEAF_RUNTIME_ENTRY
static intptr_t DeoptimizeWithDeoptInfo(const Code& code,
const DeoptInfo& deopt_info,
const StackFrame& caller_frame) {
const intptr_t len = deopt_info.Length();
GrowableArray<DeoptInstr*> deopt_instructions(len);
for (intptr_t i = 0; i < len; i++) {
deopt_instructions.Add(DeoptInstr::Create(deopt_info.Instruction(i),
deopt_info.FromIndex(i)));
}
intptr_t* start = reinterpret_cast<intptr_t*>(caller_frame.sp() - kWordSize);
const Function& function = Function::Handle(code.function());
const intptr_t num_args =
function.HasOptionalParameters() ? 0 : function.num_fixed_parameters();
intptr_t to_frame_size =
1 // Deoptimized function's return address.
+ (caller_frame.fp() - caller_frame.sp()) / kWordSize
+ 3 // caller-fp, pc, pc-marker.
+ num_args;
DeoptimizationContext deopt_context(start,
to_frame_size,
Array::Handle(code.object_table()),
num_args);
for (intptr_t to_index = len - 1; to_index >= 0; to_index--) {
deopt_instructions[to_index]->Execute(&deopt_context, to_index);
}
if (FLAG_trace_deoptimization_verbose) {
for (intptr_t i = 0; i < len; i++) {
OS::Print("*%"Pd". [%p] %#014"Px" [%s]\n",
i,
&start[i],
start[i],
deopt_instructions[i]->ToCString());
}
}
return deopt_context.GetCallerFp();
}
// The stack has been adjusted to fit all values for unoptimized frame.
// Fill the unoptimized frame.
DEFINE_LEAF_RUNTIME_ENTRY(intptr_t, DeoptimizeFillFrame, uword last_fp) {
Isolate* isolate = Isolate::Current();
StackZone zone(isolate);
HANDLESCOPE(isolate);
DartFrameIterator iterator(last_fp);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
const Code& optimized_code = Code::Handle(caller_frame->LookupDartCode());
const Function& function = Function::Handle(optimized_code.function());
ASSERT(!function.IsNull());
const Code& unoptimized_code = Code::Handle(function.unoptimized_code());
ASSERT(!optimized_code.IsNull() && optimized_code.is_optimized());
ASSERT(!unoptimized_code.IsNull() && !unoptimized_code.is_optimized());
intptr_t* frame_copy = isolate->deopt_frame_copy();
intptr_t* cpu_registers_copy = isolate->deopt_cpu_registers_copy();
double* xmm_registers_copy = isolate->deopt_xmm_registers_copy();
DeoptInfo& deopt_info = DeoptInfo::Handle();
DeoptReasonId deopt_reason = kDeoptUnknown;
GetDeoptInfoAtPc(optimized_code, caller_frame->pc(), &deopt_info,
&deopt_reason);
ASSERT(!deopt_info.IsNull());
const intptr_t caller_fp =
DeoptimizeWithDeoptInfo(optimized_code, deopt_info, *caller_frame);
isolate->SetDeoptFrameCopy(NULL, 0);
isolate->set_deopt_cpu_registers_copy(NULL);
isolate->set_deopt_xmm_registers_copy(NULL);
delete[] frame_copy;
delete[] cpu_registers_copy;
delete[] xmm_registers_copy;
return caller_fp;
}
END_LEAF_RUNTIME_ENTRY
// This is the last step in the deoptimization, GC can occur.
DEFINE_RUNTIME_ENTRY(DeoptimizeMaterializeDoubles, 0) {
DeferredDouble* deferred_double = Isolate::Current()->DetachDeferredDoubles();
while (deferred_double != NULL) {
DeferredDouble* current = deferred_double;
deferred_double = deferred_double->next();
RawDouble** slot = current->slot();
*slot = Double::New(current->value());
if (FLAG_trace_deoptimization_verbose) {
OS::Print("materializing double at %"Px": %g\n",
reinterpret_cast<uword>(current->slot()),
current->value());
}
delete current;
}
DeferredMint* deferred_mint = Isolate::Current()->DetachDeferredMints();
while (deferred_mint != NULL) {
DeferredMint* current = deferred_mint;
deferred_mint = deferred_mint->next();
RawMint** slot = current->slot();
ASSERT(!Smi::IsValid64(current->value()));
*slot = Mint::New(current->value());
if (FLAG_trace_deoptimization_verbose) {
OS::Print("materializing mint at %"Px": %"Pd64"\n",
reinterpret_cast<uword>(current->slot()),
current->value());
}
delete current;
}
// Since this is the only step where GC can occur during deoptimization,
// use it to report the source line where deoptimization occured.
if (FLAG_trace_deoptimization) {
DartFrameIterator iterator;
StackFrame* top_frame = iterator.NextFrame();
ASSERT(top_frame != NULL);
const Code& code = Code::Handle(top_frame->LookupDartCode());
const Function& top_function = Function::Handle(code.function());
const Script& script = Script::Handle(top_function.script());
const intptr_t token_pos = code.GetTokenIndexOfPC(top_frame->pc());
intptr_t line, column;
script.GetTokenLocation(token_pos, &line, &column);
String& line_string = String::Handle(script.GetLine(line));
OS::Print(" Function: %s\n", top_function.ToFullyQualifiedCString());
OS::Print(" Line %"Pd": '%s'\n", line, line_string.ToCString());
}
}
} // namespace dart