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sdk/runtime/vm/runtime_entry.cc
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Régis Crelier 9b14a361a8 [VM] Address more TODOs related to generic functions. 
Remove parsing support for 'super' that was meant to declare lower bounds of
function type parameters, since this feature did not make it into the spec.

Change-Id: I4087d0e108c5984437083a05a065fe785888d2f7
Reviewed-on: https://dart-review.googlesource.com/17360
Commit-Queue: Régis Crelier <regis@google.com>
Reviewed-by: Siva Annamalai <asiva@google.com>
2017-10-31 17:55:26 +00:00

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// Copyright (c) 2011, 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/runtime_entry.h"
#include "vm/ast.h"
#include "vm/code_patcher.h"
#include "vm/compiler/assembler/assembler.h"
#include "vm/compiler/jit/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/flags.h"
#include "vm/kernel_isolate.h"
#include "vm/message.h"
#include "vm/message_handler.h"
#include "vm/object_store.h"
#include "vm/parser.h"
#include "vm/resolver.h"
#include "vm/service_isolate.h"
#include "vm/stack_frame.h"
#include "vm/symbols.h"
#include "vm/thread_registry.h"
#include "vm/verifier.h"
namespace dart {
DEFINE_FLAG(
int,
max_subtype_cache_entries,
100,
"Maximum number of subtype cache entries (number of checks cached).");
DEFINE_FLAG(
int,
regexp_optimization_counter_threshold,
1000,
"RegExp's usage-counter value before it is optimized, -1 means never");
DEFINE_FLAG(int,
reoptimization_counter_threshold,
4000,
"Counter threshold before a function gets reoptimized.");
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_optimized_ic_calls,
false,
"Trace IC calls 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(bool, trace_type_checks, false, "Trace runtime type checks.");
DECLARE_FLAG(int, max_deoptimization_counter_threshold);
DECLARE_FLAG(bool, enable_inlining_annotations);
DECLARE_FLAG(bool, trace_compiler);
DECLARE_FLAG(bool, trace_optimizing_compiler);
DECLARE_FLAG(int, max_polymorphic_checks);
DEFINE_FLAG(bool, trace_osr, false, "Trace attempts at on-stack replacement.");
DEFINE_FLAG(int,
stacktrace_every,
0,
"Compute debugger stacktrace on every N stack overflow checks");
DEFINE_FLAG(charp,
stacktrace_filter,
NULL,
"Compute stacktrace in named function on stack overflow checks");
DEFINE_FLAG(charp,
deoptimize_filter,
NULL,
"Deoptimize in named function on stack overflow checks");
DECLARE_FLAG(int, reload_every);
DECLARE_FLAG(bool, reload_every_optimized);
DECLARE_FLAG(bool, reload_every_back_off);
#ifdef DEBUG
DEFINE_FLAG(charp,
gc_at_instance_allocation,
NULL,
"Perform a GC before allocation of instances of "
"the specified class");
#endif
#if defined(TESTING) || defined(DEBUG)
void VerifyOnTransition() {
Thread* thread = Thread::Current();
TransitionGeneratedToVM transition(thread);
VerifyPointersVisitor::VerifyPointers();
thread->isolate()->heap()->Verify();
}
#endif
// Add function to a class and that class to the class dictionary so that
// frame walking can be used.
const Function& RegisterFakeFunction(const char* name, const Code& code) {
Thread* thread = Thread::Current();
const String& class_name = String::Handle(Symbols::New(thread, "ownerClass"));
const Script& script = Script::Handle();
const Library& lib = Library::Handle(Library::CoreLibrary());
const Class& owner_class = Class::Handle(
Class::New(lib, class_name, script, TokenPosition::kNoSource));
const String& function_name = String::ZoneHandle(Symbols::New(thread, name));
const Function& function = Function::ZoneHandle(Function::New(
function_name, RawFunction::kRegularFunction, true, false, false, false,
false, owner_class, TokenPosition::kMinSource));
const Array& functions = Array::Handle(Array::New(1));
functions.SetAt(0, function);
owner_class.SetFunctions(functions);
lib.AddClass(owner_class);
function.AttachCode(code);
return function;
}
DEFINE_RUNTIME_ENTRY(TraceFunctionEntry, 1) {
const Function& function = Function::CheckedHandle(arguments.ArgAt(0));
const String& function_name = String::Handle(function.name());
const String& class_name =
String::Handle(Class::Handle(function.Owner()).Name());
OS::PrintErr("> Entering '%s.%s'\n", class_name.ToCString(),
function_name.ToCString());
}
DEFINE_RUNTIME_ENTRY(TraceFunctionExit, 1) {
const Function& function = Function::CheckedHandle(arguments.ArgAt(0));
const String& function_name = String::Handle(function.name());
const String& class_name =
String::Handle(Class::Handle(function.Owner()).Name());
OS::PrintErr("< Exiting '%s.%s'\n", class_name.ToCString(),
function_name.ToCString());
}
DEFINE_RUNTIME_ENTRY(RangeError, 2) {
const Instance& length = Instance::CheckedHandle(arguments.ArgAt(0));
const Instance& index = Instance::CheckedHandle(arguments.ArgAt(1));
if (!length.IsInteger()) {
// Throw: new ArgumentError.value(length, "length", "is not an integer");
const Array& args = Array::Handle(Array::New(3));
args.SetAt(0, length);
args.SetAt(1, Symbols::Length());
args.SetAt(2, String::Handle(String::New("is not an integer")));
Exceptions::ThrowByType(Exceptions::kArgumentValue, args);
}
if (!index.IsInteger()) {
// Throw: new ArgumentError.value(index, "index", "is not an integer");
const Array& args = Array::Handle(Array::New(3));
args.SetAt(0, index);
args.SetAt(1, Symbols::Index());
args.SetAt(2, String::Handle(String::New("is not an integer")));
Exceptions::ThrowByType(Exceptions::kArgumentValue, args);
}
// Throw: new RangeError.range(index, 0, length, "length");
const Array& args = Array::Handle(Array::New(4));
args.SetAt(0, index);
args.SetAt(1, Integer::Handle(Integer::New(0)));
args.SetAt(2, length);
args.SetAt(3, Symbols::Length());
Exceptions::ThrowByType(Exceptions::kRange, args);
}
DEFINE_RUNTIME_ENTRY(NullError, 0) {
// TODO(dartbug.com/30480): Fill in arguments of NoSuchMethodError.
const String& member_name = String::Handle(String::New("???"));
const Smi& invocation_type =
Smi::Handle(Smi::New(InvocationMirror::EncodeType(
InvocationMirror::kDynamic, InvocationMirror::kMethod)));
const Array& args = Array::Handle(Array::New(6));
args.SetAt(0, /* instance */ Object::null_object());
args.SetAt(1, member_name);
args.SetAt(2, invocation_type);
args.SetAt(3, /* func_type_args */ Object::null_object());
args.SetAt(4, /* func_args */ Object::null_object());
args.SetAt(5, /* func_arg_names */ Object::null_object());
Exceptions::ThrowByType(Exceptions::kNoSuchMethod, args);
}
// 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 type arguments, i.e. vector of 1 type, the element type.
// Return value: newly allocated array of length arg0.
DEFINE_RUNTIME_ENTRY(AllocateArray, 2) {
const Instance& length = Instance::CheckedHandle(arguments.ArgAt(0));
if (!length.IsInteger()) {
// Throw: new ArgumentError.value(length, "length", "is not an integer");
const Array& args = Array::Handle(Array::New(3));
args.SetAt(0, length);
args.SetAt(1, Symbols::Length());
args.SetAt(2, String::Handle(String::New("is not an integer")));
Exceptions::ThrowByType(Exceptions::kArgumentValue, args);
}
if (length.IsSmi()) {
const intptr_t len = Smi::Cast(length).Value();
if ((len >= 0) && (len <= Array::kMaxElements)) {
const Array& array = Array::Handle(Array::New(len, Heap::kNew));
arguments.SetReturn(array);
TypeArguments& element_type =
TypeArguments::CheckedHandle(arguments.ArgAt(1));
// An Array is raw or takes one type argument. However, its type argument
// vector may be longer than 1 due to a type optimization reusing the type
// argument vector of the instantiator.
ASSERT(element_type.IsNull() ||
((element_type.Length() >= 1) && element_type.IsInstantiated()));
array.SetTypeArguments(element_type); // May be null.
return;
}
}
// Throw: new RangeError.range(length, 0, Array::kMaxElements, "length");
const Array& args = Array::Handle(Array::New(4));
args.SetAt(0, length);
args.SetAt(1, Integer::Handle(Integer::New(0)));
args.SetAt(2, Integer::Handle(Integer::New(Array::kMaxElements)));
args.SetAt(3, Symbols::Length());
Exceptions::ThrowByType(Exceptions::kRange, args);
}
// Helper returning the token position of the Dart caller.
static TokenPosition GetCallerLocation() {
DartFrameIterator iterator(Thread::Current(),
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
return caller_frame->GetTokenPos();
}
// 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.
// Return value: newly allocated object.
DEFINE_RUNTIME_ENTRY(AllocateObject, 2) {
const Class& cls = Class::CheckedHandle(arguments.ArgAt(0));
#ifdef DEBUG
if (FLAG_gc_at_instance_allocation != NULL) {
const String& name = String::Handle(cls.Name());
if (String::EqualsIgnoringPrivateKey(
name,
String::Handle(String::New(FLAG_gc_at_instance_allocation)))) {
Isolate::Current()->heap()->CollectAllGarbage();
}
}
#endif
Heap::Space space = Heap::kNew;
const Instance& instance = Instance::Handle(Instance::New(cls, space));
arguments.SetReturn(instance);
if (cls.NumTypeArguments() == 0) {
// No type arguments required for a non-parameterized type.
ASSERT(Instance::CheckedHandle(arguments.ArgAt(1)).IsNull());
return;
}
TypeArguments& type_arguments =
TypeArguments::CheckedHandle(arguments.ArgAt(1));
// Unless null (for a raw type), the type argument vector may be longer than
// necessary due to a type optimization reusing the type argument vector of
// the instantiator.
ASSERT(type_arguments.IsNull() ||
(type_arguments.IsInstantiated() &&
(type_arguments.Length() >= cls.NumTypeArguments())));
instance.SetTypeArguments(type_arguments);
}
// Instantiate type.
// Arg0: uninstantiated type.
// Arg1: instantiator type arguments.
// Arg2: function type arguments.
// Return value: instantiated type.
DEFINE_RUNTIME_ENTRY(InstantiateType, 3) {
AbstractType& type = AbstractType::CheckedHandle(zone, arguments.ArgAt(0));
const TypeArguments& instantiator_type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(1));
const TypeArguments& function_type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(2));
ASSERT(!type.IsNull() && !type.IsInstantiated());
ASSERT(instantiator_type_arguments.IsNull() ||
instantiator_type_arguments.IsInstantiated());
ASSERT(function_type_arguments.IsNull() ||
function_type_arguments.IsInstantiated());
Error& bound_error = Error::Handle(zone);
type =
type.InstantiateFrom(instantiator_type_arguments, function_type_arguments,
kAllFree, &bound_error, NULL, NULL, Heap::kOld);
if (!bound_error.IsNull()) {
// Throw a dynamic type error.
const TokenPosition location = GetCallerLocation();
String& bound_error_message =
String::Handle(zone, String::New(bound_error.ToErrorCString()));
Exceptions::CreateAndThrowTypeError(location, AbstractType::Handle(zone),
AbstractType::Handle(zone),
Symbols::Empty(), bound_error_message);
UNREACHABLE();
}
if (type.IsTypeRef()) {
type = TypeRef::Cast(type).type();
ASSERT(!type.IsTypeRef());
ASSERT(type.IsCanonical());
}
ASSERT(!type.IsNull() && type.IsInstantiated());
arguments.SetReturn(type);
}
// Instantiate type arguments.
// Arg0: uninstantiated type arguments.
// Arg1: instantiator type arguments.
// Arg2: function type arguments.
// Return value: instantiated type arguments.
DEFINE_RUNTIME_ENTRY(InstantiateTypeArguments, 3) {
TypeArguments& type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(0));
const TypeArguments& instantiator_type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(1));
const TypeArguments& function_type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(2));
ASSERT(!type_arguments.IsNull() && !type_arguments.IsInstantiated());
ASSERT(instantiator_type_arguments.IsNull() ||
instantiator_type_arguments.IsInstantiated());
ASSERT(function_type_arguments.IsNull() ||
function_type_arguments.IsInstantiated());
// Code inlined in the caller should have optimized the case where the
// instantiator can be reused as type argument vector.
ASSERT(!type_arguments.IsUninstantiatedIdentity());
if (isolate->type_checks()) {
Error& bound_error = Error::Handle(zone);
type_arguments = type_arguments.InstantiateAndCanonicalizeFrom(
instantiator_type_arguments, function_type_arguments, &bound_error);
if (!bound_error.IsNull()) {
// Throw a dynamic type error.
const TokenPosition location = GetCallerLocation();
String& bound_error_message =
String::Handle(zone, String::New(bound_error.ToErrorCString()));
Exceptions::CreateAndThrowTypeError(
location, AbstractType::Handle(zone), AbstractType::Handle(zone),
Symbols::Empty(), bound_error_message);
UNREACHABLE();
}
} else {
type_arguments = type_arguments.InstantiateAndCanonicalizeFrom(
instantiator_type_arguments, function_type_arguments, NULL);
}
ASSERT(type_arguments.IsNull() || type_arguments.IsInstantiated());
arguments.SetReturn(type_arguments);
}
// 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) {
const Smi& num_variables = Smi::CheckedHandle(zone, arguments.ArgAt(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) {
const Context& ctx = Context::CheckedHandle(zone, arguments.ArgAt(0));
Context& cloned_ctx =
Context::Handle(zone, Context::New(ctx.num_variables()));
cloned_ctx.set_parent(Context::Handle(ctx.parent()));
Object& inst = Object::Handle(zone);
for (int i = 0; i < ctx.num_variables(); i++) {
inst = ctx.At(i);
cloned_ctx.SetAt(i, inst);
}
arguments.SetReturn(cloned_ctx);
}
// Helper routine for tracing a type check.
static void PrintTypeCheck(const char* message,
const Instance& instance,
const AbstractType& type,
const TypeArguments& instantiator_type_arguments,
const TypeArguments& function_type_arguments,
const Bool& result) {
DartFrameIterator iterator(Thread::Current(),
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
const AbstractType& instance_type =
AbstractType::Handle(instance.GetType(Heap::kNew));
ASSERT(instance_type.IsInstantiated() ||
(instance.IsClosure() && instance_type.IsInstantiated(kCurrentClass)));
if (type.IsInstantiated()) {
OS::PrintErr("%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().raw()) ? "is" : "is !",
String::Handle(type.Name()).ToCString(),
Class::Handle(type.type_class()).id(), caller_frame->pc());
} else {
// Instantiate type before printing.
Error& bound_error = Error::Handle();
const AbstractType& instantiated_type =
AbstractType::Handle(type.InstantiateFrom(
instantiator_type_arguments, function_type_arguments, kAllFree,
&bound_error, NULL, NULL, Heap::kOld));
OS::PrintErr("%s: '%s' %s '%s' instantiated from '%s' (pc: %#" Px ").\n",
message, String::Handle(instance_type.Name()).ToCString(),
(result.raw() == Bool::True().raw()) ? "is" : "is !",
String::Handle(instantiated_type.Name()).ToCString(),
String::Handle(type.Name()).ToCString(), caller_frame->pc());
if (!bound_error.IsNull()) {
OS::Print(" bound error: %s\n", bound_error.ToErrorCString());
}
}
const Function& function =
Function::Handle(caller_frame->LookupDartFunction());
OS::PrintErr(" -> Function %s\n", function.ToFullyQualifiedCString());
}
// This updates the type test cache, an array containing 5-value elements
// (instance class (or function if the instance is a closure), instance type
// arguments, instantiator type arguments, function 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).
static void UpdateTypeTestCache(
const Instance& instance,
const AbstractType& type,
const TypeArguments& instantiator_type_arguments,
const TypeArguments& function_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()) {
if (FLAG_trace_type_checks) {
OS::Print("UpdateTypeTestCache: cache is null\n");
}
return;
}
if (instance.IsSmi()) {
if (FLAG_trace_type_checks) {
OS::Print("UpdateTypeTestCache: instance is Smi\n");
}
return;
}
// If the type is uninstantiated and refers to parent function type
// parameters, the function_type_arguments have been canonicalized
// when concatenated.
ASSERT(function_type_arguments.IsNull() ||
function_type_arguments.IsCanonical());
const Class& instance_class = Class::Handle(instance.clazz());
Object& instance_class_id_or_function = Object::Handle();
TypeArguments& instance_type_arguments = TypeArguments::Handle();
if (instance_class.IsClosureClass()) {
// If the closure instance has a generic parent, we cannot perform the
// optimization, because one more input (closure.function_type_arguments)
// would need to be considered. For now, only perform the optimization if
// the closure's function_type_arguments field is null, meaning the closure
// function has no generic parent.
if (Closure::Cast(instance).function_type_arguments() !=
TypeArguments::null()) {
if (FLAG_trace_type_checks) {
OS::Print(
"UpdateTypeTestCache: closure function_type_arguments is "
"not null\n");
}
return;
}
instance_class_id_or_function = Closure::Cast(instance).function();
instance_type_arguments =
Closure::Cast(instance).instantiator_type_arguments();
} else {
instance_class_id_or_function = Smi::New(instance_class.id());
if (instance_class.NumTypeArguments() > 0) {
instance_type_arguments = instance.GetTypeArguments();
}
}
const intptr_t len = new_cache.NumberOfChecks();
if (len >= FLAG_max_subtype_cache_entries) {
return;
}
#if defined(DEBUG)
ASSERT(instance_type_arguments.IsNull() ||
instance_type_arguments.IsCanonical());
ASSERT(instantiator_type_arguments.IsNull() ||
instantiator_type_arguments.IsCanonical());
ASSERT(function_type_arguments.IsNull() ||
function_type_arguments.IsCanonical());
Object& last_instance_class_id_or_function = Object::Handle();
TypeArguments& last_instance_type_arguments = TypeArguments::Handle();
TypeArguments& last_instantiator_type_arguments = TypeArguments::Handle();
TypeArguments& last_function_type_arguments = TypeArguments::Handle();
Bool& last_result = Bool::Handle();
for (intptr_t i = 0; i < len; ++i) {
new_cache.GetCheck(i, &last_instance_class_id_or_function,
&last_instance_type_arguments,
&last_instantiator_type_arguments,
&last_function_type_arguments, &last_result);
if ((last_instance_class_id_or_function.raw() ==
instance_class_id_or_function.raw()) &&
(last_instance_type_arguments.raw() == instance_type_arguments.raw()) &&
(last_instantiator_type_arguments.raw() ==
instantiator_type_arguments.raw()) &&
(last_function_type_arguments.raw() == function_type_arguments.raw())) {
OS::PrintErr(" Error in test cache %p ix: %" Pd ",", new_cache.raw(), i);
PrintTypeCheck(" duplicate cache entry", instance, type,
instantiator_type_arguments, function_type_arguments,
result);
UNREACHABLE();
return;
}
}
#endif
new_cache.AddCheck(instance_class_id_or_function, instance_type_arguments,
instantiator_type_arguments, function_type_arguments,
result);
if (FLAG_trace_type_checks) {
AbstractType& test_type = AbstractType::Handle(type.raw());
if (!test_type.IsInstantiated()) {
Error& bound_error = Error::Handle();
test_type = type.InstantiateFrom(instantiator_type_arguments,
function_type_arguments, kAllFree,
&bound_error, NULL, NULL, Heap::kNew);
ASSERT(bound_error.IsNull()); // Malbounded types are not optimized.
}
OS::PrintErr(
" Updated test cache %p ix: %" Pd
" with "
"(cid-or-fun: %p, type-args: %p, i-type-args: %p, f-type-args: %p, "
"result: %s)\n"
" instance [class: (%p '%s' cid: %" Pd
"), type-args: %p %s]\n"
" test-type [class: (%p '%s' cid: %" Pd
"), i-type-args: %p %s, f-type-args: %p %s]\n",
new_cache.raw(), len,
instance_class_id_or_function.raw(), instance_type_arguments.raw(),
instantiator_type_arguments.raw(), instantiator_type_arguments.raw(),
result.ToCString(),
instance_class.raw(), String::Handle(instance_class.Name()).ToCString(),
instance_class.id(), instance_type_arguments.raw(),
instance_type_arguments.ToCString(),
test_type.type_class(),
String::Handle(Class::Handle(test_type.type_class()).Name())
.ToCString(),
Class::Handle(test_type.type_class()).id(),
instantiator_type_arguments.raw(),
instantiator_type_arguments.ToCString(), function_type_arguments.raw(),
function_type_arguments.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: type arguments of the instantiator of the type.
// Arg3: type arguments of the function of the type.
// Arg4: SubtypeTestCache.
// Return value: true or false, or may throw a type error in checked mode.
DEFINE_RUNTIME_ENTRY(Instanceof, 5) {
const Instance& instance = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const AbstractType& type =
AbstractType::CheckedHandle(zone, arguments.ArgAt(1));
const TypeArguments& instantiator_type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(2));
const TypeArguments& function_type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(3));
const SubtypeTestCache& cache =
SubtypeTestCache::CheckedHandle(zone, arguments.ArgAt(4));
ASSERT(type.IsFinalized());
ASSERT(!type.IsMalformed()); // Already checked in code generator.
ASSERT(!type.IsMalbounded()); // Already checked in code generator.
ASSERT(!type.IsDynamicType()); // No need to check assignment.
Error& bound_error = Error::Handle(zone);
const Bool& result =
Bool::Get(instance.IsInstanceOf(type, instantiator_type_arguments,
function_type_arguments, &bound_error));
if (FLAG_trace_type_checks) {
PrintTypeCheck("InstanceOf", instance, type, instantiator_type_arguments,
function_type_arguments, result);
}
if (!result.value() && !bound_error.IsNull()) {
// Throw a dynamic type error only if the instanceof test fails.
const TokenPosition location = GetCallerLocation();
String& bound_error_message =
String::Handle(zone, String::New(bound_error.ToErrorCString()));
Exceptions::CreateAndThrowTypeError(location, AbstractType::Handle(zone),
AbstractType::Handle(zone),
Symbols::Empty(), bound_error_message);
UNREACHABLE();
}
UpdateTypeTestCache(instance, type, instantiator_type_arguments,
function_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: type arguments of the instantiator of the type being assigned to.
// Arg3: type arguments of the function 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) {
const Instance& src_instance =
Instance::CheckedHandle(zone, arguments.ArgAt(0));
AbstractType& dst_type =
AbstractType::CheckedHandle(zone, arguments.ArgAt(1));
const TypeArguments& instantiator_type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(2));
const TypeArguments& function_type_arguments =
TypeArguments::CheckedHandle(zone, arguments.ArgAt(3));
const String& dst_name = String::CheckedHandle(zone, arguments.ArgAt(4));
const SubtypeTestCache& cache =
SubtypeTestCache::CheckedHandle(zone, arguments.ArgAt(5));
ASSERT(!dst_type.IsMalformed()); // Already checked in code generator.
ASSERT(!dst_type.IsMalbounded()); // Already checked in code generator.
ASSERT(!dst_type.IsDynamicType()); // No need to check assignment.
ASSERT(!src_instance.IsNull()); // Already checked in inlined code.
Error& bound_error = Error::Handle(zone);
const bool is_instance_of =
src_instance.IsInstanceOf(dst_type, instantiator_type_arguments,
function_type_arguments, &bound_error);
if (FLAG_trace_type_checks) {
PrintTypeCheck("TypeCheck", src_instance, dst_type,
instantiator_type_arguments, function_type_arguments,
Bool::Get(is_instance_of));
}
if (!is_instance_of) {
// Throw a dynamic type error.
const TokenPosition location = GetCallerLocation();
const AbstractType& src_type =
AbstractType::Handle(zone, src_instance.GetType(Heap::kNew));
if (!dst_type.IsInstantiated()) {
// Instantiate dst_type before reporting the error.
dst_type = dst_type.InstantiateFrom(instantiator_type_arguments,
function_type_arguments, kAllFree,
NULL, NULL, NULL, Heap::kNew);
// Note that instantiated dst_type may be malbounded.
}
String& bound_error_message = String::Handle(zone);
if (!bound_error.IsNull()) {
ASSERT(isolate->type_checks());
bound_error_message = String::New(bound_error.ToErrorCString());
}
Exceptions::CreateAndThrowTypeError(location, src_type, dst_type, dst_name,
bound_error_message);
UNREACHABLE();
}
UpdateTypeTestCache(src_instance, dst_type, instantiator_type_arguments,
function_type_arguments, Bool::True(), cache);
arguments.SetReturn(src_instance);
}
// Report that the type of the given object is not bool in conditional context.
// Throw assertion error if the object is null. (cf. Boolean Conversion
// in language Spec.)
// Arg0: bad object.
// Return value: none, throws TypeError or AssertionError.
DEFINE_RUNTIME_ENTRY(NonBoolTypeError, 1) {
const TokenPosition location = GetCallerLocation();
const Instance& src_instance =
Instance::CheckedHandle(zone, arguments.ArgAt(0));
if (src_instance.IsNull()) {
const Array& args = Array::Handle(zone, Array::New(5));
args.SetAt(
0, String::Handle(
zone,
String::New(
"Failed assertion: boolean expression must not be null")));
// No source code for this assertion, set url to null.
args.SetAt(1, String::Handle(zone, String::null()));
args.SetAt(2, Smi::Handle(zone, Smi::New(0)));
args.SetAt(3, Smi::Handle(zone, Smi::New(0)));
args.SetAt(4, String::Handle(zone, String::null()));
Exceptions::ThrowByType(Exceptions::kAssertion, args);
UNREACHABLE();
}
ASSERT(!src_instance.IsBool());
const Type& bool_interface = Type::Handle(Type::BoolType());
const AbstractType& src_type =
AbstractType::Handle(zone, src_instance.GetType(Heap::kNew));
const String& no_bound_error = String::Handle(zone);
Exceptions::CreateAndThrowTypeError(location, src_type, bool_interface,
Symbols::BooleanExpression(),
no_bound_error);
UNREACHABLE();
}
// Report that the type of the type check is malformed or malbounded.
// Arg0: src value.
// Arg1: name of destination being assigned to.
// Arg2: type of destination being assigned to.
// Return value: none, throws an exception.
DEFINE_RUNTIME_ENTRY(BadTypeError, 3) {
const TokenPosition location = GetCallerLocation();
const Instance& src_value = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const String& dst_name = String::CheckedHandle(zone, arguments.ArgAt(1));
const AbstractType& dst_type =
AbstractType::CheckedHandle(zone, arguments.ArgAt(2));
const AbstractType& src_type =
AbstractType::Handle(zone, src_value.GetType(Heap::kNew));
Exceptions::CreateAndThrowTypeError(location, src_type, dst_type, dst_name,
String::Handle(zone));
UNREACHABLE();
}
DEFINE_RUNTIME_ENTRY(Throw, 1) {
const Instance& exception = Instance::CheckedHandle(zone, arguments.ArgAt(0));
Exceptions::Throw(thread, exception);
}
DEFINE_RUNTIME_ENTRY(ReThrow, 2) {
const Instance& exception = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const Instance& stacktrace =
Instance::CheckedHandle(zone, arguments.ArgAt(1));
Exceptions::ReThrow(thread, exception, stacktrace);
}
// Patches static call in optimized code with the target's entry point.
// Compiles target if necessary.
DEFINE_RUNTIME_ENTRY(PatchStaticCall, 0) {
#if !defined(DART_PRECOMPILED_RUNTIME)
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
const Code& caller_code = Code::Handle(zone, caller_frame->LookupDartCode());
ASSERT(!caller_code.IsNull());
ASSERT(caller_code.is_optimized());
const Function& target_function = Function::Handle(
zone, caller_code.GetStaticCallTargetFunctionAt(caller_frame->pc()));
const Code& target_code = Code::Handle(zone, target_function.EnsureHasCode());
// Before patching verify that we are not repeatedly patching to the same
// target.
ASSERT(target_code.raw() !=
CodePatcher::GetStaticCallTargetAt(caller_frame->pc(), caller_code));
CodePatcher::PatchStaticCallAt(caller_frame->pc(), caller_code, target_code);
caller_code.SetStaticCallTargetCodeAt(caller_frame->pc(), target_code);
if (FLAG_trace_patching) {
THR_Print("PatchStaticCall: patching caller pc %#" Px
""
" to '%s' new entry point %#" Px " (%s)\n",
caller_frame->pc(), target_function.ToFullyQualifiedCString(),
target_code.UncheckedEntryPoint(),
target_code.is_optimized() ? "optimized" : "unoptimized");
}
arguments.SetReturn(target_code);
#else
UNREACHABLE();
#endif
}
// 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));
}
}
#if defined(PRODUCT) || defined(DART_PRECOMPILED_RUNTIME)
DEFINE_RUNTIME_ENTRY(BreakpointRuntimeHandler, 0) {
UNREACHABLE();
return;
}
#elif !defined(TARGET_ARCH_DBC)
// Gets called from debug stub when code reaches a breakpoint
// set on a runtime stub call.
DEFINE_RUNTIME_ENTRY(BreakpointRuntimeHandler, 0) {
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
const Code& orig_stub = Code::Handle(
zone, isolate->debugger()->GetPatchedStubAddress(caller_frame->pc()));
const Error& error =
Error::Handle(zone, isolate->debugger()->PauseBreakpoint());
if (!error.IsNull()) {
Exceptions::PropagateError(error);
UNREACHABLE();
}
arguments.SetReturn(orig_stub);
}
#else
// Gets called from the simulator when the breakpoint is reached.
DEFINE_RUNTIME_ENTRY(BreakpointRuntimeHandler, 0) {
const Error& error = Error::Handle(isolate->debugger()->PauseBreakpoint());
if (!error.IsNull()) {
Exceptions::PropagateError(error);
UNREACHABLE();
}
}
#endif // !defined(TARGET_ARCH_DBC)
DEFINE_RUNTIME_ENTRY(SingleStepHandler, 0) {
#if defined(PRODUCT) || defined(DART_PRECOMPILED_RUNTIME)
UNREACHABLE();
#else
const Error& error =
Error::Handle(zone, isolate->debugger()->PauseStepping());
if (!error.IsNull()) {
Exceptions::PropagateError(error);
UNREACHABLE();
}
#endif
}
// An instance call of the form o.f(...) could not be resolved. Check if
// there is a getter with the same name. If so, invoke it. If the value is
// a closure, invoke it with the given arguments. If the value is a
// non-closure, attempt to invoke "call" on it.
static bool ResolveCallThroughGetter(const Instance& receiver,
const Class& receiver_class,
const String& target_name,
const Array& arguments_descriptor,
Function* result) {
// 1. Check if there is a getter with the same name.
const String& getter_name = String::Handle(Field::GetterName(target_name));
const int kTypeArgsLen = 0;
const int kNumArguments = 1;
ArgumentsDescriptor args_desc(
Array::Handle(ArgumentsDescriptor::New(kTypeArgsLen, kNumArguments)));
const Function& getter =
Function::Handle(Resolver::ResolveDynamicForReceiverClass(
receiver_class, getter_name, args_desc));
if (getter.IsNull() || getter.IsMethodExtractor()) {
return false;
}
const Function& target_function =
Function::Handle(receiver_class.GetInvocationDispatcher(
target_name, arguments_descriptor,
RawFunction::kInvokeFieldDispatcher, FLAG_lazy_dispatchers));
ASSERT(!target_function.IsNull() || !FLAG_lazy_dispatchers);
if (FLAG_trace_ic) {
OS::PrintErr(
"InvokeField IC miss: adding <%s> id:%" Pd " -> <%s>\n",
Class::Handle(receiver.clazz()).ToCString(), receiver.GetClassId(),
target_function.IsNull() ? "null" : target_function.ToCString());
}
*result = target_function.raw();
return true;
}
// Handle other invocations (implicit closures, noSuchMethod).
RawFunction* InlineCacheMissHelper(const Instance& receiver,
const Array& args_descriptor,
const String& target_name) {
const Class& receiver_class = Class::Handle(receiver.clazz());
Function& result = Function::Handle();
if (!ResolveCallThroughGetter(receiver, receiver_class, target_name,
args_descriptor, &result)) {
ArgumentsDescriptor desc(args_descriptor);
const Function& target_function =
Function::Handle(receiver_class.GetInvocationDispatcher(
target_name, args_descriptor, RawFunction::kNoSuchMethodDispatcher,
FLAG_lazy_dispatchers));
if (FLAG_trace_ic) {
OS::PrintErr(
"NoSuchMethod IC miss: adding <%s> id:%" Pd " -> <%s>\n",
Class::Handle(receiver.clazz()).ToCString(), receiver.GetClassId(),
target_function.IsNull() ? "null" : target_function.ToCString());
}
result = target_function.raw();
}
// May be null if --no-lazy-dispatchers, in which case dispatch will be
// handled by InvokeNoSuchMethodDispatcher.
ASSERT(!result.IsNull() || !FLAG_lazy_dispatchers);
return result.raw();
}
// Perform the subtype and return constant function based on the result.
static RawFunction* ComputeTypeCheckTarget(const Instance& receiver,
const AbstractType& type,
const ArgumentsDescriptor& desc) {
Error& error = Error::Handle();
bool result = receiver.IsInstanceOf(type, Object::null_type_arguments(),
Object::null_type_arguments(), &error);
ASSERT(error.IsNull());
ObjectStore* store = Isolate::Current()->object_store();
const Function& target =
Function::Handle(result ? store->simple_instance_of_true_function()
: store->simple_instance_of_false_function());
ASSERT(!target.IsNull());
return target.raw();
}
static RawFunction* InlineCacheMissHandler(
const GrowableArray<const Instance*>& args, // Checked arguments only.
const ICData& ic_data) {
const Instance& receiver = *args[0];
ArgumentsDescriptor arguments_descriptor(
Array::Handle(ic_data.arguments_descriptor()));
String& function_name = String::Handle(ic_data.target_name());
ASSERT(function_name.IsSymbol());
Function& target_function = Function::Handle(
Resolver::ResolveDynamic(receiver, function_name, arguments_descriptor));
ObjectStore* store = Isolate::Current()->object_store();
if (target_function.raw() == store->simple_instance_of_function()) {
// Replace the target function with constant function.
const AbstractType& type = AbstractType::Cast(*args[1]);
target_function =
ComputeTypeCheckTarget(receiver, type, arguments_descriptor);
}
if (target_function.IsNull()) {
if (FLAG_trace_ic) {
OS::PrintErr("InlineCacheMissHandler NULL function for %s receiver: %s\n",
String::Handle(ic_data.target_name()).ToCString(),
receiver.ToCString());
}
const Array& args_descriptor =
Array::Handle(ic_data.arguments_descriptor());
const String& target_name = String::Handle(ic_data.target_name());
target_function =
InlineCacheMissHelper(receiver, args_descriptor, target_name);
}
if (target_function.IsNull()) {
ASSERT(!FLAG_lazy_dispatchers);
return target_function.raw();
}
if (args.length() == 1) {
ic_data.AddReceiverCheck(args[0]->GetClassId(), target_function);
} else {
GrowableArray<intptr_t> class_ids(args.length());
ASSERT(ic_data.NumArgsTested() == args.length());
for (intptr_t i = 0; i < args.length(); i++) {
class_ids.Add(args[i]->GetClassId());
}
ic_data.AddCheck(class_ids, target_function);
}
if (FLAG_trace_ic_miss_in_optimized || FLAG_trace_ic) {
DartFrameIterator iterator(Thread::Current(),
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
if (FLAG_trace_ic_miss_in_optimized) {
const Code& caller = Code::Handle(Code::LookupCode(caller_frame->pc()));
if (caller.is_optimized()) {
OS::PrintErr("IC miss in optimized code; call %s -> %s\n",
Function::Handle(caller.function()).ToCString(),
target_function.ToCString());
}
}
if (FLAG_trace_ic) {
OS::PrintErr("InlineCacheMissHandler %" Pd " call at %#" Px
"' "
"adding <%s> id:%" Pd " -> <%s>\n",
args.length(), caller_frame->pc(),
Class::Handle(receiver.clazz()).ToCString(),
receiver.GetClassId(), target_function.ToCString());
}
}
return target_function.raw();
}
// Handles inline cache misses by updating the IC data array of the call site.
// Arg0: Receiver object.
// Arg1: IC data object.
// Returns: target function with compiled code or null.
// Modifies the instance call to hold the updated IC data array.
DEFINE_RUNTIME_ENTRY(InlineCacheMissHandlerOneArg, 2) {
const Instance& receiver = Instance::CheckedHandle(arguments.ArgAt(0));
const ICData& ic_data = ICData::CheckedHandle(arguments.ArgAt(1));
GrowableArray<const Instance*> args(1);
args.Add(&receiver);
const Function& result =
Function::Handle(InlineCacheMissHandler(args, ic_data));
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: IC data object.
// Returns: target function with compiled code or null.
// Modifies the instance call to hold the updated IC data array.
DEFINE_RUNTIME_ENTRY(InlineCacheMissHandlerTwoArgs, 3) {
const Instance& receiver = Instance::CheckedHandle(arguments.ArgAt(0));
const Instance& other = Instance::CheckedHandle(arguments.ArgAt(1));
const ICData& ic_data = ICData::CheckedHandle(arguments.ArgAt(2));
GrowableArray<const Instance*> args(2);
args.Add(&receiver);
args.Add(&other);
const Function& result =
Function::Handle(InlineCacheMissHandler(args, ic_data));
arguments.SetReturn(result);
}
// Handles a static call in unoptimized code that has one argument type not
// seen before. Compile the target if necessary and update the ICData.
// Arg0: argument.
// Arg1: IC data object.
DEFINE_RUNTIME_ENTRY(StaticCallMissHandlerOneArg, 2) {
const Instance& arg = Instance::CheckedHandle(arguments.ArgAt(0));
const ICData& ic_data = ICData::CheckedHandle(arguments.ArgAt(1));
// IC data for static call is prepopulated with the statically known target.
ASSERT(ic_data.NumberOfChecksIs(1));
const Function& target = Function::Handle(ic_data.GetTargetAt(0));
target.EnsureHasCode();
ASSERT(!target.IsNull() && target.HasCode());
ic_data.AddReceiverCheck(arg.GetClassId(), target, 1);
if (FLAG_trace_ic) {
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
OS::PrintErr("StaticCallMissHandler at %#" Px " target %s (%" Pd ")\n",
caller_frame->pc(), target.ToCString(), arg.GetClassId());
}
arguments.SetReturn(target);
}
// Handles a static call in unoptimized code that has two argument types not
// seen before. Compile the target if necessary and update the ICData.
// Arg0: argument 0.
// Arg1: argument 1.
// Arg2: IC data object.
DEFINE_RUNTIME_ENTRY(StaticCallMissHandlerTwoArgs, 3) {
const Instance& arg0 = Instance::CheckedHandle(arguments.ArgAt(0));
const Instance& arg1 = Instance::CheckedHandle(arguments.ArgAt(1));
const ICData& ic_data = ICData::CheckedHandle(arguments.ArgAt(2));
// IC data for static call is prepopulated with the statically known target.
ASSERT(!ic_data.NumberOfChecksIs(0));
const Function& target = Function::Handle(ic_data.GetTargetAt(0));
target.EnsureHasCode();
GrowableArray<intptr_t> cids(2);
cids.Add(arg0.GetClassId());
cids.Add(arg1.GetClassId());
ic_data.AddCheck(cids, target);
if (FLAG_trace_ic) {
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
OS::PrintErr("StaticCallMissHandler at %#" Px " target %s (%" Pd ", %" Pd
")\n",
caller_frame->pc(), target.ToCString(), cids[0], cids[1]);
}
arguments.SetReturn(target);
}
#if !defined(TARGET_ARCH_DBC)
static bool IsSingleTarget(Isolate* isolate,
Zone* zone,
intptr_t lower_cid,
intptr_t upper_cid,
const Function& target,
const String& name) {
Class& cls = Class::Handle(zone);
ClassTable* table = isolate->class_table();
Function& other_target = Function::Handle(zone);
for (intptr_t cid = lower_cid; cid <= upper_cid; cid++) {
if (!table->HasValidClassAt(cid)) continue;
cls = table->At(cid);
if (cls.is_abstract()) continue;
if (!cls.is_allocated()) continue;
other_target =
Resolver::ResolveDynamicAnyArgs(zone, cls, name, false /* allow_add */);
if (other_target.raw() != target.raw()) {
return false;
}
}
return true;
}
#endif
// Handle a miss of a single target cache.
// Arg0: Receiver.
// Returns: the ICData used to continue with a polymorphic call.
DEFINE_RUNTIME_ENTRY(SingleTargetMiss, 1) {
#if defined(TARGET_ARCH_DBC)
// DBC does not use switchable calls.
UNREACHABLE();
#else
const Instance& receiver = Instance::CheckedHandle(zone, arguments.ArgAt(0));
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame->IsDartFrame());
const Code& caller_code = Code::Handle(zone, caller_frame->LookupDartCode());
const Function& caller_function =
Function::Handle(zone, caller_frame->LookupDartFunction());
SingleTargetCache& cache = SingleTargetCache::Handle(zone);
cache ^=
CodePatcher::GetSwitchableCallDataAt(caller_frame->pc(), caller_code);
Code& old_target_code = Code::Handle(zone, cache.target());
Function& old_target = Function::Handle(zone);
old_target ^= old_target_code.owner();
// We lost the original ICData when we patched to the monomorphic case.
const String& name = String::Handle(zone, old_target.name());
ASSERT(!old_target.HasOptionalParameters());
ASSERT(!old_target.IsGeneric());
const int kTypeArgsLen = 0;
const Array& descriptor =
Array::Handle(zone, ArgumentsDescriptor::New(
kTypeArgsLen, old_target.num_fixed_parameters()));
const ICData& ic_data =
ICData::Handle(zone, ICData::New(caller_function, name, descriptor,
Thread::kNoDeoptId, 1, /* args_tested */
ICData::kInstance));
// Maybe add the new target.
Class& cls = Class::Handle(zone, receiver.clazz());
ArgumentsDescriptor args_desc(descriptor);
Function& target_function = Function::Handle(
zone, Resolver::ResolveDynamicForReceiverClass(cls, name, args_desc));
if (target_function.IsNull()) {
target_function = InlineCacheMissHelper(receiver, descriptor, name);
}
if (target_function.IsNull()) {
ASSERT(!FLAG_lazy_dispatchers);
} else {
ic_data.AddReceiverCheck(receiver.GetClassId(), target_function);
}
if (old_target.raw() == target_function.raw()) {
intptr_t lower, upper, unchecked_lower, unchecked_upper;
if (receiver.GetClassId() < cache.lower_limit()) {
lower = receiver.GetClassId();
unchecked_lower = receiver.GetClassId();
upper = cache.upper_limit();
unchecked_upper = cache.lower_limit() - 1;
} else {
lower = cache.lower_limit();
unchecked_lower = cache.upper_limit() + 1;
upper = receiver.GetClassId();
unchecked_upper = receiver.GetClassId();
}
if (IsSingleTarget(isolate, zone, unchecked_lower, unchecked_upper,
target_function, name)) {
cache.set_lower_limit(lower);
cache.set_upper_limit(upper);
// Return the ICData. The single target stub will jump to continue in the
// IC call stub.
arguments.SetReturn(ic_data);
return;
}
}
// Call site is not single target, switch to call using ICData.
const Code& stub =
Code::Handle(zone, StubCode::ICCallThroughCode_entry()->code());
ASSERT(!Isolate::Current()->compilation_allowed());
CodePatcher::PatchSwitchableCallAt(caller_frame->pc(), caller_code, ic_data,
stub);
// Return the ICData. The single target stub will jump to continue in the
// IC call stub.
arguments.SetReturn(ic_data);
#endif
}
DEFINE_RUNTIME_ENTRY(UnlinkedCall, 2) {
#if defined(TARGET_ARCH_DBC)
// DBC does not use switchable calls.
UNREACHABLE();
#else
const Instance& receiver = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const UnlinkedCall& unlinked =
UnlinkedCall::CheckedHandle(zone, arguments.ArgAt(1));
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame->IsDartFrame());
const Code& caller_code = Code::Handle(zone, caller_frame->LookupDartCode());
const Function& caller_function =
Function::Handle(zone, caller_frame->LookupDartFunction());
const String& name = String::Handle(zone, unlinked.target_name());
const Array& descriptor = Array::Handle(zone, unlinked.args_descriptor());
const ICData& ic_data =
ICData::Handle(zone, ICData::New(caller_function, name, descriptor,
Thread::kNoDeoptId, 1, /* args_tested */
ICData::kInstance));
Class& cls = Class::Handle(zone, receiver.clazz());
ArgumentsDescriptor args_desc(descriptor);
Function& target_function = Function::Handle(
zone, Resolver::ResolveDynamicForReceiverClass(cls, name, args_desc));
if (target_function.IsNull()) {
target_function = InlineCacheMissHelper(receiver, descriptor, name);
}
if (target_function.IsNull()) {
ASSERT(!FLAG_lazy_dispatchers);
} else {
ic_data.AddReceiverCheck(receiver.GetClassId(), target_function);
}
if (!target_function.IsNull() && !target_function.HasOptionalParameters() &&
!target_function.IsGeneric()) {
// Patch to monomorphic call.
ASSERT(target_function.HasCode());
const Code& target_code = Code::Handle(zone, target_function.CurrentCode());
const Smi& expected_cid =
Smi::Handle(zone, Smi::New(receiver.GetClassId()));
CodePatcher::PatchSwitchableCallAt(caller_frame->pc(), caller_code,
expected_cid, target_code);
// Return the ICData. The miss stub will jump to continue in the IC call
// stub.
arguments.SetReturn(ic_data);
return;
}
// Patch to call through stub.
const Code& stub =
Code::Handle(zone, StubCode::ICCallThroughCode_entry()->code());
ASSERT(!Isolate::Current()->compilation_allowed());
CodePatcher::PatchSwitchableCallAt(caller_frame->pc(), caller_code, ic_data,
stub);
// Return the ICData. The miss stub will jump to continue in the IC lookup
// stub.
arguments.SetReturn(ic_data);
#endif // !DBC
}
// Handle a miss of a megamorphic cache.
// Arg0: Receiver.
// Returns: the ICData used to continue with a polymorphic call.
DEFINE_RUNTIME_ENTRY(MonomorphicMiss, 1) {
#if defined(TARGET_ARCH_DBC)
// DBC does not use switchable calls.
UNREACHABLE();
#else
const Instance& receiver = Instance::CheckedHandle(zone, arguments.ArgAt(0));
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame->IsDartFrame());
const Code& caller_code = Code::Handle(zone, caller_frame->LookupDartCode());
const Function& caller_function =
Function::Handle(zone, caller_frame->LookupDartFunction());
Smi& old_expected_cid = Smi::Handle(zone);
old_expected_cid ^=
CodePatcher::GetSwitchableCallDataAt(caller_frame->pc(), caller_code);
const Code& old_target_code = Code::Handle(
CodePatcher::GetSwitchableCallTargetAt(caller_frame->pc(), caller_code));
Function& old_target = Function::Handle(zone);
old_target ^= old_target_code.owner();
// We lost the original ICData when we patched to the monomorphic case.
const String& name = String::Handle(zone, old_target.name());
ASSERT(!old_target.HasOptionalParameters());
const int kTypeArgsLen = 0;
const Array& descriptor =
Array::Handle(zone, ArgumentsDescriptor::New(
kTypeArgsLen, old_target.num_fixed_parameters()));
const ICData& ic_data =
ICData::Handle(zone, ICData::New(caller_function, name, descriptor,
Thread::kNoDeoptId, 1, /* args_tested */
ICData::kInstance));
// Add the first target.
ic_data.AddReceiverCheck(old_expected_cid.Value(), old_target);
// Maybe add the new target.
Class& cls = Class::Handle(zone, receiver.clazz());
ArgumentsDescriptor args_desc(descriptor);
Function& target_function = Function::Handle(
zone, Resolver::ResolveDynamicForReceiverClass(cls, name, args_desc));
if (target_function.IsNull()) {
target_function = InlineCacheMissHelper(receiver, descriptor, name);
}
if (target_function.IsNull()) {
ASSERT(!FLAG_lazy_dispatchers);
} else {
ic_data.AddReceiverCheck(receiver.GetClassId(), target_function);
}
if (old_target.raw() == target_function.raw()) {
intptr_t lower, upper;
if (old_expected_cid.Value() < receiver.GetClassId()) {
lower = old_expected_cid.Value();
upper = receiver.GetClassId();
} else {
lower = receiver.GetClassId();
upper = old_expected_cid.Value();
}
if (IsSingleTarget(isolate, zone, lower, upper, target_function, name)) {
const SingleTargetCache& cache =
SingleTargetCache::Handle(SingleTargetCache::New());
const Code& code = Code::Handle(target_function.CurrentCode());
cache.set_target(code);
cache.set_entry_point(code.UncheckedEntryPoint());
cache.set_lower_limit(lower);
cache.set_upper_limit(upper);
const Code& stub =
Code::Handle(zone, StubCode::SingleTargetCall_entry()->code());
CodePatcher::PatchSwitchableCallAt(caller_frame->pc(), caller_code, cache,
stub);
// Return the ICData. The miss stub will jump to continue in the IC call
// stub.
arguments.SetReturn(ic_data);
return;
}
}
// Patch to call through stub.
const Code& stub =
Code::Handle(zone, StubCode::ICCallThroughCode_entry()->code());
ASSERT(!Isolate::Current()->compilation_allowed());
CodePatcher::PatchSwitchableCallAt(caller_frame->pc(), caller_code, ic_data,
stub);
// Return the ICData. The miss stub will jump to continue in the IC lookup
// stub.
arguments.SetReturn(ic_data);
#endif // !defined(TARGET_ARCH_DBC)
}
// Handle a miss of a megamorphic cache.
// Arg0: Receiver.
// Arg1: ICData or MegamorphicCache.
// Arg2: Arguments descriptor array.
// Returns: target function to call.
DEFINE_RUNTIME_ENTRY(MegamorphicCacheMissHandler, 3) {
#if defined(TARGET_ARCH_DBC)
// DBC does not use megamorphic calls right now.
UNREACHABLE();
#else
const Instance& receiver = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const Object& ic_data_or_cache = Object::Handle(zone, arguments.ArgAt(1));
const Array& descriptor = Array::CheckedHandle(zone, arguments.ArgAt(2));
String& name = String::Handle(zone);
if (ic_data_or_cache.IsICData()) {
name = ICData::Cast(ic_data_or_cache).target_name();
} else {
ASSERT(ic_data_or_cache.IsMegamorphicCache());
name = MegamorphicCache::Cast(ic_data_or_cache).target_name();
}
Class& cls = Class::Handle(zone, receiver.clazz());
ASSERT(!cls.IsNull());
ArgumentsDescriptor args_desc(descriptor);
if (FLAG_trace_ic || FLAG_trace_ic_miss_in_optimized) {
OS::PrintErr("Megamorphic IC miss (%s), class=%s, function<%" Pd ">=%s\n",
ic_data_or_cache.IsICData() ? "icdata" : "cache",
cls.ToCString(), args_desc.TypeArgsLen(), name.ToCString());
}
Function& target_function = Function::Handle(
zone, Resolver::ResolveDynamicForReceiverClass(cls, name, args_desc));
if (target_function.IsNull()) {
target_function = InlineCacheMissHelper(receiver, descriptor, name);
if (target_function.IsNull()) {
ASSERT(!FLAG_lazy_dispatchers);
arguments.SetReturn(target_function);
return;
}
}
if (ic_data_or_cache.IsICData()) {
const ICData& ic_data = ICData::Cast(ic_data_or_cache);
const intptr_t number_of_checks = ic_data.NumberOfChecks();
if ((number_of_checks == 0) && !target_function.HasOptionalParameters() &&
!target_function.IsGeneric() &&
!Isolate::Current()->compilation_allowed()) {
// This call site is unlinked: transition to a monomorphic direct call.
// Note we cannot do this if the target has optional parameters because
// the monomorphic direct call does not load the arguments descriptor.
// We cannot do this if we are still in the middle of precompiling because
// the monomorphic case hides a live instance selector from the
// treeshaker.
const Code& target_code =
Code::Handle(zone, target_function.EnsureHasCode());
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* miss_function_frame = iterator.NextFrame();
ASSERT(miss_function_frame->IsDartFrame());
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame->IsDartFrame());
const Code& caller_code =
Code::Handle(zone, caller_frame->LookupDartCode());
const Smi& expected_cid =
Smi::Handle(zone, Smi::New(receiver.GetClassId()));
CodePatcher::PatchSwitchableCallAt(caller_frame->pc(), caller_code,
expected_cid, target_code);
} else {
ic_data.AddReceiverCheck(receiver.GetClassId(), target_function);
if (number_of_checks > FLAG_max_polymorphic_checks) {
// Switch to megamorphic call.
const MegamorphicCache& cache = MegamorphicCache::Handle(
zone, MegamorphicCacheTable::Lookup(isolate, name, descriptor));
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* miss_function_frame = iterator.NextFrame();
ASSERT(miss_function_frame->IsDartFrame());
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame->IsDartFrame());
const Code& caller_code =
Code::Handle(zone, caller_frame->LookupDartCode());
const Code& stub =
Code::Handle(zone, StubCode::MegamorphicCall_entry()->code());
CodePatcher::PatchSwitchableCallAt(caller_frame->pc(), caller_code,
cache, stub);
}
}
} else {
const MegamorphicCache& cache = MegamorphicCache::Cast(ic_data_or_cache);
// Insert function found into cache and return it.
cache.EnsureCapacity();
const Smi& class_id = Smi::Handle(zone, Smi::New(cls.id()));
cache.Insert(class_id, target_function);
}
arguments.SetReturn(target_function);
#endif // !defined(TARGET_ARCH_DBC)
}
// Invoke appropriate noSuchMethod or closure from getter.
// Arg0: receiver
// Arg1: ICData or MegamorphicCache
// Arg2: arguments descriptor array
// Arg3: arguments array
DEFINE_RUNTIME_ENTRY(InvokeNoSuchMethodDispatcher, 4) {
ASSERT(!FLAG_lazy_dispatchers);
const Instance& receiver = Instance::CheckedHandle(zone, arguments.ArgAt(0));
const Object& ic_data_or_cache = Object::Handle(zone, arguments.ArgAt(1));
const Array& orig_arguments_desc =
Array::CheckedHandle(zone, arguments.ArgAt(2));
const Array& orig_arguments = Array::CheckedHandle(zone, arguments.ArgAt(3));
String& target_name = String::Handle(zone);
if (ic_data_or_cache.IsICData()) {
target_name = ICData::Cast(ic_data_or_cache).target_name();
} else {
ASSERT(ic_data_or_cache.IsMegamorphicCache());
target_name = MegamorphicCache::Cast(ic_data_or_cache).target_name();
}
Class& cls = Class::Handle(zone, receiver.clazz());
Function& function = Function::Handle(zone);
// Dart distinguishes getters and regular methods and allows their calls
// to mix with conversions, and its selectors are independent of arity. So do
// a zigzagged lookup to see if this call failed because of an arity mismatch,
// need for conversion, or there really is no such method.
#define NO_SUCH_METHOD() \
const Object& result = Object::Handle( \
zone, DartEntry::InvokeNoSuchMethod( \
receiver, target_name, orig_arguments, orig_arguments_desc)); \
CheckResultError(result); \
arguments.SetReturn(result);
#define CLOSURIZE(some_function) \
const Function& closure_function = \
Function::Handle(zone, some_function.ImplicitClosureFunction()); \
const Object& result = Object::Handle( \
zone, closure_function.ImplicitInstanceClosure(receiver)); \
arguments.SetReturn(result);
const bool is_getter = Field::IsGetterName(target_name);
if (is_getter) {
// o.foo (o.get:foo) failed, closurize o.foo() if it exists.
String& field_name =
String::Handle(zone, Field::NameFromGetter(target_name));
while (!cls.IsNull()) {
function ^= cls.LookupDynamicFunction(field_name);
if (!function.IsNull()) {
CLOSURIZE(function);
return;
}
cls = cls.SuperClass();
}
// Fall through for noSuchMethod
} else {
// o.foo(...) failed, invoke noSuchMethod is foo exists but has the wrong
// number of arguments, or try (o.foo).call(...)
if ((target_name.raw() == Symbols::Call().raw()) && receiver.IsClosure()) {
// Special case: closures are implemented with a call getter instead of a
// call method and with lazy dispatchers the field-invocation-dispatcher
// would perform the closure call.
const Object& result = Object::Handle(
zone, DartEntry::InvokeClosure(orig_arguments, orig_arguments_desc));
CheckResultError(result);
arguments.SetReturn(result);
return;
}
const String& getter_name =
String::Handle(zone, Field::GetterName(target_name));
while (!cls.IsNull()) {
function ^= cls.LookupDynamicFunction(target_name);
if (!function.IsNull()) {
ArgumentsDescriptor args_desc(orig_arguments_desc);
ASSERT(!function.AreValidArguments(args_desc, NULL));
break; // mismatch, invoke noSuchMethod
}
function ^= cls.LookupDynamicFunction(getter_name);
if (!function.IsNull()) {
const Array& getter_arguments = Array::Handle(Array::New(1));
getter_arguments.SetAt(0, receiver);
const Object& getter_result = Object::Handle(
zone, DartEntry::InvokeFunction(function, getter_arguments));
CheckResultError(getter_result);
ASSERT(getter_result.IsNull() || getter_result.IsInstance());
orig_arguments.SetAt(0, getter_result);
const Object& call_result = Object::Handle(
zone,
DartEntry::InvokeClosure(orig_arguments, orig_arguments_desc));
CheckResultError(call_result);
arguments.SetReturn(call_result);
return;
}
cls = cls.SuperClass();
}
}
NO_SUCH_METHOD();
#undef NO_SUCH_METHOD
#undef CLOSURIZE
}
// Invoke appropriate noSuchMethod function.
// Arg0: receiver (closure object)
// Arg1: arguments descriptor array.
// Arg2: arguments array.
DEFINE_RUNTIME_ENTRY(InvokeClosureNoSuchMethod, 3) {
const Closure& receiver = Closure::CheckedHandle(arguments.ArgAt(0));
const Array& orig_arguments_desc = Array::CheckedHandle(arguments.ArgAt(1));
const Array& orig_arguments = Array::CheckedHandle(arguments.ArgAt(2));
// For closure the function name is always 'call'. Replace it with the
// name of the closurized function so that exception contains more
// relevant information.
const Function& function = Function::Handle(receiver.function());
const String& original_function_name =
String::Handle(function.QualifiedUserVisibleName());
const Object& result = Object::Handle(DartEntry::InvokeNoSuchMethod(
receiver, original_function_name, orig_arguments, orig_arguments_desc));
CheckResultError(result);
arguments.SetReturn(result);
}
DEFINE_RUNTIME_ENTRY(StackOverflow, 0) {
#if defined(USING_SIMULATOR)
uword stack_pos = Simulator::Current()->get_sp();
#else
uword stack_pos = Thread::GetCurrentStackPointer();
#endif
// Always clear the stack overflow flags. They are meant for this
// particular stack overflow runtime call and are not meant to
// persist.
uword stack_overflow_flags = thread->GetAndClearStackOverflowFlags();
// If an interrupt happens at the same time as a stack overflow, we
// process the stack overflow now and leave the interrupt for next
// time.
if (IsCalleeFrameOf(thread->saved_stack_limit(), stack_pos)) {
// Use the preallocated stack overflow exception to avoid calling
// into dart code.
const Instance& exception =
Instance::Handle(isolate->object_store()->stack_overflow());
Exceptions::Throw(thread, exception);
UNREACHABLE();
}
#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
// The following code is used to stress test deoptimization and
// debugger stack tracing.
bool do_deopt = false;
bool do_stacktrace = false;
bool do_reload = false;
const intptr_t isolate_reload_every =
isolate->reload_every_n_stack_overflow_checks();
if ((FLAG_deoptimize_every > 0) || (FLAG_stacktrace_every > 0) ||
(isolate_reload_every > 0)) {
bool is_auxiliary_isolate = ServiceIsolate::IsServiceIsolate(isolate);
#if !defined(DART_PRECOMPILED_RUNTIME)
// Certain flags should not effect the kernel isolate itself. They might be
// used by tests via the "VMOptions=--..." annotation to test VM
// functionality in the main isolate.
is_auxiliary_isolate =
is_auxiliary_isolate || KernelIsolate::IsKernelIsolate(isolate);
#endif // !defined(DART_PRECOMPILED_RUNTIME)
if (!is_auxiliary_isolate) {
// TODO(turnidge): To make --deoptimize_every and
// --stacktrace-every faster we could move this increment/test to
// the generated code.
int32_t count = thread->IncrementAndGetStackOverflowCount();
if (FLAG_deoptimize_every > 0 && (count % FLAG_deoptimize_every) == 0) {
do_deopt = true;
}
if (FLAG_stacktrace_every > 0 && (count % FLAG_stacktrace_every) == 0) {
do_stacktrace = true;
}
if ((isolate_reload_every > 0) && (count % isolate_reload_every) == 0) {
do_reload = isolate->CanReload();
}
}
}
if ((FLAG_deoptimize_filter != NULL) || (FLAG_stacktrace_filter != NULL) ||
FLAG_reload_every_optimized) {
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* frame = iterator.NextFrame();
ASSERT(frame != NULL);
const Code& code = Code::Handle(frame->LookupDartCode());
ASSERT(!code.IsNull());
const Function& function = Function::Handle(code.function());
ASSERT(!function.IsNull());
const char* function_name = function.ToFullyQualifiedCString();
ASSERT(function_name != NULL);
if (!code.is_optimized() && FLAG_reload_every_optimized) {
// Don't do the reload if we aren't inside optimized code.
do_reload = false;
}
if (code.is_optimized() && FLAG_deoptimize_filter != NULL &&
strstr(function_name, FLAG_deoptimize_filter) != NULL) {
OS::PrintErr("*** Forcing deoptimization (%s)\n",
function.ToFullyQualifiedCString());
do_deopt = true;
}
if (FLAG_stacktrace_filter != NULL &&
strstr(function_name, FLAG_stacktrace_filter) != NULL) {
OS::PrintErr("*** Computing stacktrace (%s)\n",
function.ToFullyQualifiedCString());
do_stacktrace = true;
}
}
if (do_deopt) {
// TODO(turnidge): Consider using DeoptimizeAt instead.
DeoptimizeFunctionsOnStack();
}
if (do_reload) {
JSONStream js;
// Maybe adjust the rate of future reloads.
isolate->MaybeIncreaseReloadEveryNStackOverflowChecks();
// Issue a reload.
bool success = isolate->ReloadSources(&js, true /* force_reload */);
if (!success) {
FATAL1("*** Isolate reload failed:\n%s\n", js.ToCString());
}
}
if (do_stacktrace) {
String& var_name = String::Handle();
Instance& var_value = Instance::Handle();
// Collecting the stack trace and accessing local variables
// of frames may trigger parsing of functions to compute
// variable descriptors of functions. Parsing may trigger
// code execution, e.g. to compute compile-time constants. Thus,
// disable FLAG_stacktrace_every during trace collection to prevent
// recursive stack trace collection.
intptr_t saved_stacktrace_every = FLAG_stacktrace_every;
FLAG_stacktrace_every = 0;
DebuggerStackTrace* stack = isolate->debugger()->StackTrace();
intptr_t num_frames = stack->Length();
for (intptr_t i = 0; i < num_frames; i++) {
ActivationFrame* frame = stack->FrameAt(i);
#ifndef DART_PRECOMPILED_RUNTIME
// Ensure that we have unoptimized code.
frame->function().EnsureHasCompiledUnoptimizedCode();
const int num_vars = frame->NumLocalVariables();
#else
// Variable locations and number are unknown when precompiling.
const int num_vars = 0;
#endif
TokenPosition unused = TokenPosition::kNoSource;
for (intptr_t v = 0; v < num_vars; v++) {
frame->VariableAt(v, &var_name, &unused, &unused, &unused, &var_value);
}
}
if (FLAG_stress_async_stacks) {
Debugger::CollectAwaiterReturnStackTrace();
}
FLAG_stacktrace_every = saved_stacktrace_every;
}
#endif // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
const Error& error = Error::Handle(thread->HandleInterrupts());
if (!error.IsNull()) {
Exceptions::PropagateError(error);
UNREACHABLE();
}
if ((stack_overflow_flags & Thread::kOsrRequest) != 0) {
ASSERT(isolate->use_osr());
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* frame = iterator.NextFrame();
ASSERT(frame != NULL);
const Code& code = Code::ZoneHandle(frame->LookupDartCode());
ASSERT(!code.IsNull());
ASSERT(!code.is_optimized());
const Function& function = Function::Handle(code.function());
ASSERT(!function.IsNull());
// If the code of the frame does not match the function's unoptimized code,
// we bail out since the code was reset by an isolate reload.
if (code.raw() != function.unoptimized_code()) {
return;
}
// Since the code is referenced from the frame and the ZoneHandle,
// it cannot have been removed from the function.
ASSERT(function.HasCode());
// Don't do OSR on intrinsified functions: The intrinsic code expects to be
// called like a regular function and can't be entered via OSR.
if (!Compiler::CanOptimizeFunction(thread, function) ||
function.is_intrinsic()) {
return;
}
// The unoptimized code is on the stack and should never be detached from
// the function at this point.
ASSERT(function.unoptimized_code() != Object::null());
intptr_t osr_id =
Code::Handle(function.unoptimized_code()).GetDeoptIdForOsr(frame->pc());
ASSERT(osr_id != Compiler::kNoOSRDeoptId);
if (FLAG_trace_osr) {
OS::Print("Attempting OSR for %s at id=%" Pd ", count=%" Pd "\n",
function.ToFullyQualifiedCString(), osr_id,
function.usage_counter());
}
// Since the code is referenced from the frame and the ZoneHandle,
// it cannot have been removed from the function.
const Object& result = Object::Handle(
Compiler::CompileOptimizedFunction(thread, function, osr_id));
if (result.IsError()) {
Exceptions::PropagateError(Error::Cast(result));
}
if (!result.IsNull()) {
const Code& code = Code::Cast(result);
uword optimized_entry =
Instructions::UncheckedEntryPoint(code.instructions());
frame->set_pc(optimized_entry);
frame->set_pc_marker(code.raw());
}
}
}
DEFINE_RUNTIME_ENTRY(TraceICCall, 2) {
const ICData& ic_data = ICData::CheckedHandle(arguments.ArgAt(0));
const Function& function = Function::CheckedHandle(arguments.ArgAt(1));
DartFrameIterator iterator(thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* frame = iterator.NextFrame();
ASSERT(frame != NULL);
OS::PrintErr("IC call @%#" Px ": ICData: %p cnt:%" Pd " nchecks: %" Pd
" %s\n",
frame->pc(), ic_data.raw(), function.usage_counter(),
ic_data.NumberOfChecks(), function.ToFullyQualifiedCString());
}
// This is called from function that needs to be optimized.
// The requesting function can be already optimized (reoptimization).
// Returns the Code object where to continue execution.
DEFINE_RUNTIME_ENTRY(OptimizeInvokedFunction, 1) {
#if !defined(DART_PRECOMPILED_RUNTIME)
const Function& function = Function::CheckedHandle(zone, arguments.ArgAt(0));
ASSERT(!function.IsNull());
ASSERT(function.HasCode());
if (Compiler::CanOptimizeFunction(thread, function)) {
if (FLAG_background_compilation) {
Field& field = Field::Handle(zone, isolate->GetDeoptimizingBoxedField());
while (!field.IsNull()) {
if (FLAG_trace_optimization || FLAG_trace_field_guards) {
THR_Print("Lazy disabling unboxing of %s\n", field.ToCString());
}
field.set_is_unboxing_candidate(false);
field.DeoptimizeDependentCode();
// Get next field.
field = isolate->GetDeoptimizingBoxedField();
}
}
// TODO(srdjan): Fix background compilation of regular expressions.
if (FLAG_background_compilation) {
if (FLAG_enable_inlining_annotations) {
FATAL("Cannot enable inlining annotations and background compilation");
}
if (!BackgroundCompiler::IsDisabled()) {
if (FLAG_background_compilation_stop_alot) {
BackgroundCompiler::Stop(isolate);
}
// Reduce the chance of triggering optimization while the function is
// being optimized in the background. INT_MIN should ensure that it
// takes long time to trigger optimization.
// Note that the background compilation queue rejects duplicate entries.
function.set_usage_counter(INT_MIN);
BackgroundCompiler::EnsureInit(thread);
ASSERT(isolate->background_compiler() != NULL);
isolate->background_compiler()->CompileOptimized(function);
// Continue in the same code.
arguments.SetReturn(function);
return;
}
}
// Reset usage counter for reoptimization before calling optimizer to
// prevent recursive triggering of function optimization.
function.set_usage_counter(0);
if (FLAG_trace_compiler || FLAG_trace_optimizing_compiler) {
if (function.HasOptimizedCode()) {
THR_Print("ReCompiling function: '%s' \n",
function.ToFullyQualifiedCString());
}
}
const Object& result = Object::Handle(
zone, Compiler::CompileOptimizedFunction(thread, function));
if (result.IsError()) {
Exceptions::PropagateError(Error::Cast(result));
}
}
arguments.SetReturn(function);
#else
UNREACHABLE();
#endif // !DART_PRECOMPILED_RUNTIME
}
// The caller must be a static call in a Dart frame, or an entry frame.
// Patch static call to point to valid code's entry point.
DEFINE_RUNTIME_ENTRY(FixCallersTarget, 0) {
#if !defined(DART_PRECOMPILED_RUNTIME)
StackFrameIterator iterator(StackFrameIterator::kDontValidateFrames, thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* frame = iterator.NextFrame();
ASSERT(frame != NULL);
while (frame->IsStubFrame() || frame->IsExitFrame()) {
frame = iterator.NextFrame();
ASSERT(frame != NULL);
}
if (frame->IsEntryFrame()) {
// Since function's current code is always unpatched, the entry frame always
// calls to unpatched code.
UNREACHABLE();
}
ASSERT(frame->IsDartFrame());
const Code& caller_code = Code::Handle(zone, frame->LookupDartCode());
ASSERT(caller_code.is_optimized());
const Function& target_function = Function::Handle(
zone, caller_code.GetStaticCallTargetFunctionAt(frame->pc()));
const Code& current_target_code =
Code::Handle(zone, target_function.EnsureHasCode());
CodePatcher::PatchStaticCallAt(frame->pc(), caller_code, current_target_code);
caller_code.SetStaticCallTargetCodeAt(frame->pc(), current_target_code);
if (FLAG_trace_patching) {
OS::PrintErr("FixCallersTarget: caller %#" Px
" "
"target '%s' -> %#" Px "\n",
frame->pc(), target_function.ToFullyQualifiedCString(),
current_target_code.UncheckedEntryPoint());
}
ASSERT(!current_target_code.IsDisabled());
arguments.SetReturn(current_target_code);
#else
UNREACHABLE();
#endif
}
// The caller tried to allocate an instance via an invalidated allocation
// stub.
DEFINE_RUNTIME_ENTRY(FixAllocationStubTarget, 0) {
#if !defined(DART_PRECOMPILED_RUNTIME)
StackFrameIterator iterator(StackFrameIterator::kDontValidateFrames, thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* frame = iterator.NextFrame();
ASSERT(frame != NULL);
while (frame->IsStubFrame() || frame->IsExitFrame()) {
frame = iterator.NextFrame();
ASSERT(frame != NULL);
}
if (frame->IsEntryFrame()) {
// There must be a valid Dart frame.
UNREACHABLE();
}
ASSERT(frame->IsDartFrame());
const Code& caller_code = Code::Handle(zone, frame->LookupDartCode());
ASSERT(!caller_code.IsNull());
const Code& stub = Code::Handle(
CodePatcher::GetStaticCallTargetAt(frame->pc(), caller_code));
Class& alloc_class = Class::ZoneHandle(zone);
alloc_class ^= stub.owner();
Code& alloc_stub = Code::Handle(zone, alloc_class.allocation_stub());
if (alloc_stub.IsNull()) {
alloc_stub = StubCode::GetAllocationStubForClass(alloc_class);
ASSERT(!alloc_stub.IsDisabled());
}
CodePatcher::PatchStaticCallAt(frame->pc(), caller_code, alloc_stub);
caller_code.SetStubCallTargetCodeAt(frame->pc(), alloc_stub);
if (FLAG_trace_patching) {
OS::PrintErr("FixAllocationStubTarget: caller %#" Px
" alloc-class %s "
" -> %#" Px "\n",
frame->pc(), alloc_class.ToCString(),
alloc_stub.UncheckedEntryPoint());
}
arguments.SetReturn(alloc_stub);
#else
UNREACHABLE();
#endif
}
const char* DeoptReasonToCString(ICData::DeoptReasonId deopt_reason) {
switch (deopt_reason) {
#define DEOPT_REASON_TO_TEXT(name) \
case ICData::kDeopt##name: \
return #name;
DEOPT_REASONS(DEOPT_REASON_TO_TEXT)
#undef DEOPT_REASON_TO_TEXT
default:
UNREACHABLE();
return "";
}
}
void DeoptimizeAt(const Code& optimized_code, StackFrame* frame) {
ASSERT(optimized_code.is_optimized());
Thread* thread = Thread::Current();
Zone* zone = thread->zone();
const Function& function = Function::Handle(zone, optimized_code.function());
const Error& error =
Error::Handle(zone, Compiler::EnsureUnoptimizedCode(thread, function));
if (!error.IsNull()) {
Exceptions::PropagateError(error);
}
const Code& unoptimized_code =
Code::Handle(zone, function.unoptimized_code());
ASSERT(!unoptimized_code.IsNull());
// The switch to unoptimized code may have already occurred.
if (function.HasOptimizedCode()) {
function.SwitchToUnoptimizedCode();
}
#if defined(TARGET_ARCH_DBC)
const Instructions& instrs =
Instructions::Handle(zone, optimized_code.instructions());
{
WritableInstructionsScope writable(instrs.PayloadStart(), instrs.Size());
CodePatcher::InsertDeoptimizationCallAt(frame->pc());
if (FLAG_trace_patching) {
const String& name = String::Handle(function.name());
OS::PrintErr("InsertDeoptimizationCallAt: 0x%" Px " for %s\n",
frame->pc(), name.ToCString());
}
const ExceptionHandlers& handlers =
ExceptionHandlers::Handle(zone, optimized_code.exception_handlers());
ExceptionHandlerInfo info;
for (intptr_t i = 0; i < handlers.num_entries(); ++i) {
handlers.GetHandlerInfo(i, &info);
const uword patch_pc = instrs.PayloadStart() + info.handler_pc_offset;
CodePatcher::InsertDeoptimizationCallAt(patch_pc);
if (FLAG_trace_patching) {
OS::PrintErr(" at handler 0x%" Px "\n", patch_pc);
}
}
}
#else // !DBC
if (frame->IsMarkedForLazyDeopt()) {
// Deopt already scheduled.
if (FLAG_trace_deoptimization) {
THR_Print("Lazy deopt already scheduled for fp=%" Pp "\n", frame->fp());
}
} else {
uword deopt_pc = frame->pc();
ASSERT(optimized_code.ContainsInstructionAt(deopt_pc));
#if defined(DEBUG)
ValidateFrames();
#endif
// N.B.: Update the pending deopt table before updating the frame. The
// profiler may attempt a stack walk in between.
thread->isolate()->AddPendingDeopt(frame->fp(), deopt_pc);
frame->MarkForLazyDeopt();
if (FLAG_trace_deoptimization) {
THR_Print("Lazy deopt scheduled for fp=%" Pp ", pc=%" Pp "\n",
frame->fp(), deopt_pc);
}
}
#endif // !DBC
// Mark code as dead (do not GC its embedded objects).
optimized_code.set_is_alive(false);
}
// Currently checks only that all optimized frames have kDeoptIndex
// and unoptimized code has the kDeoptAfter.
void DeoptimizeFunctionsOnStack() {
DartFrameIterator iterator(Thread::Current(),
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* frame = iterator.NextFrame();
Code& optimized_code = Code::Handle();
while (frame != NULL) {
optimized_code = frame->LookupDartCode();
if (optimized_code.is_optimized()) {
DeoptimizeAt(optimized_code, frame);
}
frame = iterator.NextFrame();
}
}
#if !defined(DART_PRECOMPILED_RUNTIME)
#if !defined(TARGET_ARCH_DBC)
static const intptr_t kNumberOfSavedCpuRegisters = kNumberOfCpuRegisters;
static const intptr_t kNumberOfSavedFpuRegisters = kNumberOfFpuRegisters;
#else
static const intptr_t kNumberOfSavedCpuRegisters = 0;
static const intptr_t kNumberOfSavedFpuRegisters = 0;
#endif
static void CopySavedRegisters(uword saved_registers_address,
fpu_register_t** fpu_registers,
intptr_t** cpu_registers) {
ASSERT(sizeof(fpu_register_t) == kFpuRegisterSize);
fpu_register_t* fpu_registers_copy =
new fpu_register_t[kNumberOfSavedFpuRegisters];
ASSERT(fpu_registers_copy != NULL);
for (intptr_t i = 0; i < kNumberOfSavedFpuRegisters; i++) {
fpu_registers_copy[i] =
*reinterpret_cast<fpu_register_t*>(saved_registers_address);
saved_registers_address += kFpuRegisterSize;
}
*fpu_registers = fpu_registers_copy;
ASSERT(sizeof(intptr_t) == kWordSize);
intptr_t* cpu_registers_copy = new intptr_t[kNumberOfSavedCpuRegisters];
ASSERT(cpu_registers_copy != NULL);
for (intptr_t i = 0; i < kNumberOfSavedCpuRegisters; i++) {
cpu_registers_copy[i] =
*reinterpret_cast<intptr_t*>(saved_registers_address);
saved_registers_address += kWordSize;
}
*cpu_registers = cpu_registers_copy;
}
#endif
// Copies saved registers and caller's frame into temporary buffers.
// Returns the stack size of unoptimized frame.
// The calling code must be optimized, but its function may not have
// have optimized code if the code is OSR code, or if the code was invalidated
// through class loading/finalization or field guard.
DEFINE_LEAF_RUNTIME_ENTRY(intptr_t,
DeoptimizeCopyFrame,
2,
uword saved_registers_address,
uword is_lazy_deopt) {
#if !defined(DART_PRECOMPILED_RUNTIME)
Thread* thread = Thread::Current();
Isolate* isolate = thread->isolate();
StackZone zone(thread);
HANDLESCOPE(thread);
// All registers have been saved below last-fp as if they were locals.
const uword last_fp = saved_registers_address +
(kNumberOfSavedCpuRegisters * kWordSize) +
(kNumberOfSavedFpuRegisters * kFpuRegisterSize) -
((kFirstLocalSlotFromFp + 1) * kWordSize);
// Get optimized code and frame that need to be deoptimized.
DartFrameIterator iterator(last_fp, thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
const Code& optimized_code = Code::Handle(caller_frame->LookupDartCode());
ASSERT(optimized_code.is_optimized());
const Function& top_function =
Function::Handle(thread->zone(), optimized_code.function());
const bool deoptimizing_code = top_function.HasOptimizedCode();
if (FLAG_trace_deoptimization) {
const Function& function = Function::Handle(optimized_code.function());
THR_Print("== Deoptimizing code for '%s', %s, %s\n",
function.ToFullyQualifiedCString(),
deoptimizing_code ? "code & frame" : "frame",
is_lazy_deopt ? "lazy-deopt" : "");
}
#if !defined(TARGET_ARCH_DBC)
if (is_lazy_deopt) {
uword deopt_pc = isolate->FindPendingDeopt(caller_frame->fp());
if (FLAG_trace_deoptimization) {
THR_Print("Lazy deopt fp=%" Pp " pc=%" Pp "\n", caller_frame->fp(),
deopt_pc);
}
// N.B.: Update frame before updating pending deopt table. The profiler
// may attempt a stack walk in between.
caller_frame->set_pc(deopt_pc);
ASSERT(caller_frame->pc() == deopt_pc);
ASSERT(optimized_code.ContainsInstructionAt(caller_frame->pc()));
isolate->ClearPendingDeoptsAtOrBelow(caller_frame->fp());
} else {
if (FLAG_trace_deoptimization) {
THR_Print("Eager deopt fp=%" Pp " pc=%" Pp "\n", caller_frame->fp(),
caller_frame->pc());
}
}
#endif // !DBC
// Copy the saved registers from the stack.
fpu_register_t* fpu_registers;
intptr_t* cpu_registers;
CopySavedRegisters(saved_registers_address, &fpu_registers, &cpu_registers);
// Create the DeoptContext.
DeoptContext* deopt_context = new DeoptContext(
caller_frame, optimized_code, DeoptContext::kDestIsOriginalFrame,
fpu_registers, cpu_registers, is_lazy_deopt != 0, deoptimizing_code);
isolate->set_deopt_context(deopt_context);
// Stack size (FP - SP) in bytes.
return deopt_context->DestStackAdjustment() * kWordSize;
#else
UNREACHABLE();
return 0;
#endif // !DART_PRECOMPILED_RUNTIME
}
END_LEAF_RUNTIME_ENTRY
// The stack has been adjusted to fit all values for unoptimized frame.
// Fill the unoptimized frame.
DEFINE_LEAF_RUNTIME_ENTRY(void, DeoptimizeFillFrame, 1, uword last_fp) {
#if !defined(DART_PRECOMPILED_RUNTIME)
Thread* thread = Thread::Current();
Isolate* isolate = thread->isolate();
StackZone zone(thread);
HANDLESCOPE(thread);
DeoptContext* deopt_context = isolate->deopt_context();
DartFrameIterator iterator(last_fp, thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* caller_frame = iterator.NextFrame();
ASSERT(caller_frame != NULL);
#if defined(DEBUG)
{
// The code from the deopt_context.
const Code& code = Code::Handle(deopt_context->code());
// The code from our frame.
const Code& optimized_code = Code::Handle(caller_frame->LookupDartCode());
const Function& function = Function::Handle(optimized_code.function());
ASSERT(!function.IsNull());
// The code will be the same as before.
ASSERT(code.raw() == optimized_code.raw());
// Some sanity checking of the optimized code.
ASSERT(!optimized_code.IsNull() && optimized_code.is_optimized());
}
#endif
deopt_context->set_dest_frame(caller_frame);
deopt_context->FillDestFrame();
#else
UNREACHABLE();
#endif // !DART_PRECOMPILED_RUNTIME
}
END_LEAF_RUNTIME_ENTRY
// This is the last step in the deoptimization, GC can occur.
// Returns number of bytes to remove from the expression stack of the
// bottom-most deoptimized frame. Those arguments were artificially injected
// under return address to keep them discoverable by GC that can occur during
// materialization phase.
DEFINE_RUNTIME_ENTRY(DeoptimizeMaterialize, 0) {
#if !defined(DART_PRECOMPILED_RUNTIME)
#if defined(DEBUG)
{
// We may rendezvous for a safepoint at entry or GC from the allocations
// below. Check the stack is walkable.
ValidateFrames();
}
#endif
DeoptContext* deopt_context = isolate->deopt_context();
intptr_t deopt_arg_count = deopt_context->MaterializeDeferredObjects();
isolate->set_deopt_context(NULL);
delete deopt_context;
// Return value tells deoptimization stub to remove the given number of bytes
// from the stack.
arguments.SetReturn(Smi::Handle(Smi::New(deopt_arg_count * kWordSize)));
#else
UNREACHABLE();
#endif // !DART_PRECOMPILED_RUNTIME
}
DEFINE_RUNTIME_ENTRY(RewindPostDeopt, 0) {
#if !defined(DART_PRECOMPILED_RUNTIME)
#if !defined(PRODUCT)
isolate->debugger()->RewindPostDeopt();
#endif // !PRODUCT
#endif // !DART_PRECOMPILED_RUNTIME
UNREACHABLE();
}
DEFINE_LEAF_RUNTIME_ENTRY(intptr_t,
BigintCompare,
2,
RawBigint* left,
RawBigint* right) {
Thread* thread = Thread::Current();
StackZone zone(thread);
HANDLESCOPE(thread);
const Bigint& big_left = Bigint::Handle(left);
const Bigint& big_right = Bigint::Handle(right);
return big_left.CompareWith(big_right);
}
END_LEAF_RUNTIME_ENTRY
double DartModulo(double left, double right) {
double remainder = fmod_ieee(left, right);
if (remainder == 0.0) {
// We explicitly switch to the positive 0.0 (just in case it was negative).
remainder = +0.0;
} else if (remainder < 0.0) {
if (right < 0) {
remainder -= right;
} else {
remainder += right;
}
}
return remainder;
}
// Update global type feedback recorded for a field recording the assignment
// of the given value.
// Arg0: Field object;
// Arg1: Value that is being stored.
DEFINE_RUNTIME_ENTRY(UpdateFieldCid, 2) {
#if !defined(DART_PRECOMPILED_RUNTIME)
const Field& field = Field::CheckedHandle(arguments.ArgAt(0));
const Object& value = Object::Handle(arguments.ArgAt(1));
field.RecordStore(value);
#else
UNREACHABLE();
#endif
}
DEFINE_RUNTIME_ENTRY(InitStaticField, 1) {
const Field& field = Field::CheckedHandle(arguments.ArgAt(0));
field.EvaluateInitializer();
}
// Print the stop message.
DEFINE_LEAF_RUNTIME_ENTRY(void, PrintStopMessage, 1, const char* message) {
OS::Print("Stop message: %s\n", message);
}
END_LEAF_RUNTIME_ENTRY
// Use expected function signatures to help MSVC compiler resolve overloading.
typedef double (*UnaryMathCFunction)(double x);
typedef double (*BinaryMathCFunction)(double x, double y);
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcPow,
2,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<BinaryMathCFunction>(&pow)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
DartModulo,
2,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(
static_cast<BinaryMathCFunction>(&DartModulo)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcAtan2,
2,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(
static_cast<BinaryMathCFunction>(&atan2_ieee)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcFloor,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&floor)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcCeil,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&ceil)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcTrunc,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&trunc)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcRound,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&round)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcCos,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&cos)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcSin,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&sin)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcAsin,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&asin)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcAcos,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&acos)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcTan,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&tan)));
DEFINE_RAW_LEAF_RUNTIME_ENTRY(
LibcAtan,
1,
true /* is_float */,
reinterpret_cast<RuntimeFunction>(static_cast<UnaryMathCFunction>(&atan)));
} // namespace dart
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