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// Copyright 2019 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/flags/flags.h"
#include "src/torque/implementation-visitor.h"
#include "src/torque/type-oracle.h"
namespace v8 {
namespace internal {
namespace torque {
namespace {
void GenerateClassDebugReader(const ClassType& type, std::ostream& h_contents,
std::ostream& cc_contents, std::ostream& visitor,
std::unordered_set<const ClassType*>* done) {
// Make sure each class only gets generated once.
if (!type.IsExtern() || !done->insert(&type).second) return;
const ClassType* super_type = type.GetSuperClass();
// We must emit the classes in dependency order. If the super class hasn't
// been emitted yet, go handle it first.
if (super_type != nullptr) {
GenerateClassDebugReader(*super_type, h_contents, cc_contents, visitor,
done);
}
const std::string name = type.name();
const std::string super_name =
super_type == nullptr ? "Object" : super_type->name();
h_contents << "\nclass Tq" << name << " : public Tq" << super_name << " {\n";
h_contents << " public:\n";
h_contents << " inline Tq" << name << "(uintptr_t address) : Tq"
<< super_name << "(address) {}\n";
h_contents << " std::vector<std::unique_ptr<ObjectProperty>> "
"GetProperties(d::MemoryAccessor accessor) const override;\n";
h_contents << " const char* GetName() const override;\n";
h_contents << " void Visit(TqObjectVisitor* visitor) const override;\n";
cc_contents << "\nconst char* Tq" << name << "::GetName() const {\n";
cc_contents << " return \"v8::internal::" << name << "\";\n";
cc_contents << "}\n";
cc_contents << "\nvoid Tq" << name
<< "::Visit(TqObjectVisitor* visitor) const {\n";
cc_contents << " visitor->Visit" << name << "(this);\n";
cc_contents << "}\n";
visitor << " virtual void Visit" << name << "(const Tq" << name
<< "* object) {\n";
visitor << " Visit" << super_name << "(object);\n";
visitor << " }\n";
std::stringstream get_props_impl;
for (const Field& field : type.fields()) {
const Type* field_type = field.name_and_type.type;
if (field_type == TypeOracle::GetVoidType()) continue;
const std::string& field_name = field.name_and_type.name;
bool is_field_tagged = field_type->IsSubtypeOf(TypeOracle::GetTaggedType());
base::Optional<const ClassType*> field_class_type =
field_type->ClassSupertype();
size_t field_size = 0;
std::string field_size_string;
std::tie(field_size, field_size_string) = field.GetFieldSizeInformation();
std::string field_value_type;
std::string field_value_type_compressed;
std::string field_cc_type;
std::string field_cc_type_compressed;
if (is_field_tagged) {
field_value_type = "uintptr_t";
field_value_type_compressed = "i::Tagged_t";
field_cc_type = "v8::internal::" + (field_class_type.has_value()
? (*field_class_type)->name()
: "Object");
field_cc_type_compressed =
COMPRESS_POINTERS_BOOL ? "v8::internal::TaggedValue" : field_cc_type;
} else {
const Type* constexpr_version = field_type->ConstexprVersion();
if (constexpr_version == nullptr) {
Error("Type '", field_type->ToString(),
"' requires a constexpr representation");
continue;
}
field_cc_type = constexpr_version->GetGeneratedTypeName();
field_cc_type_compressed = field_cc_type;
// Note that we need constexpr names to resolve correctly in the global
// namespace, because we're passing them as strings to a debugging
// extension. We can verify this during build of the debug helper, because
// we use this type for a local variable below, and generate this code in
// a disjoint namespace. However, we can't emit a useful error at this
// point. Instead we'll emit a comment that might be helpful.
field_value_type =
field_cc_type +
" /*Failing? Ensure constexpr type name is fully qualified and "
"necessary #includes are in debug-helper-internal.h*/";
field_value_type_compressed = field_value_type;
}
const std::string field_getter =
"Get" + CamelifyString(field_name) + "Value";
const std::string address_getter =
"Get" + CamelifyString(field_name) + "Address";
std::string indexed_field_info;
std::string index_param;
std::string index_offset;
if (field.index) {
const Type* index_type = (*field.index)->name_and_type.type;
std::string index_type_name;
std::string index_value;
if (index_type == TypeOracle::GetSmiType()) {
index_type_name = "uintptr_t";
index_value =
"i::PlatformSmiTagging::SmiToInt(indexed_field_count.value)";
} else if (!index_type->IsSubtypeOf(TypeOracle::GetTaggedType())) {
const Type* constexpr_index = index_type->ConstexprVersion();
if (constexpr_index == nullptr) {
Error("Type '", index_type->ToString(),
"' requires a constexpr representation");
continue;
}
index_type_name = constexpr_index->GetGeneratedTypeName();
index_value = "indexed_field_count.value";
} else {
Error("Unsupported index type: ", index_type);
continue;
}
get_props_impl << " Value<" << index_type_name
<< "> indexed_field_count = Get"
<< CamelifyString((*field.index)->name_and_type.name)
<< "Value(accessor);\n";
indexed_field_info =
", " + index_value + ", GetArrayKind(indexed_field_count.validity)";
index_param = ", size_t offset";
index_offset = " + offset * sizeof(value)";
}
get_props_impl
<< " result.push_back(v8::base::make_unique<ObjectProperty>(\""
<< field_name << "\", \"" << field_cc_type_compressed << "\", \""
<< field_cc_type << "\", " << address_getter << "()"
<< indexed_field_info << "));\n";
h_contents << " uintptr_t " << address_getter << "() const;\n";
h_contents << " Value<" << field_value_type << "> " << field_getter
<< "(d::MemoryAccessor accessor " << index_param << ") const;\n";
cc_contents << "\nuintptr_t Tq" << name << "::" << address_getter
<< "() const {\n";
cc_contents << " return address_ - i::kHeapObjectTag + " << field.offset
<< ";\n";
cc_contents << "}\n";
cc_contents << "\nValue<" << field_value_type << "> Tq" << name
<< "::" << field_getter << "(d::MemoryAccessor accessor"
<< index_param << ") const {\n";
cc_contents << " " << field_value_type_compressed << " value{};\n";
cc_contents << " d::MemoryAccessResult validity = accessor("
<< address_getter << "()" << index_offset
<< ", reinterpret_cast<uint8_t*>(&value), sizeof(value));\n";
cc_contents << " return {validity, "
<< (is_field_tagged ? "Decompress(value, address_)" : "value")
<< "};\n";
cc_contents << "}\n";
}
h_contents << "};\n";
cc_contents << "\nstd::vector<std::unique_ptr<ObjectProperty>> Tq" << name
<< "::GetProperties(d::MemoryAccessor accessor) const {\n";
cc_contents << " std::vector<std::unique_ptr<ObjectProperty>> result = Tq"
<< super_name << "::GetProperties(accessor);\n";
cc_contents << get_props_impl.str();
cc_contents << " return result;\n";
cc_contents << "}\n";
}
} // namespace
void ImplementationVisitor::GenerateClassDebugReaders(
const std::string& output_directory) {
const std::string file_name = "class-debug-readers-tq";
std::stringstream h_contents;
std::stringstream cc_contents;
h_contents << "// Provides the ability to read object properties in\n";
h_contents << "// postmortem or remote scenarios, where the debuggee's\n";
h_contents << "// memory is not part of the current process's address\n";
h_contents << "// space and must be read using a callback function.\n\n";
{
IncludeGuardScope include_guard(h_contents, file_name + ".h");
h_contents << "#include <cstdint>\n";
h_contents << "#include <vector>\n";
h_contents
<< "\n#include \"tools/debug_helper/debug-helper-internal.h\"\n\n";
cc_contents << "#include \"torque-generated/" << file_name << ".h\"\n";
cc_contents << "#include \"include/v8-internal.h\"\n\n";
cc_contents << "namespace i = v8::internal;\n\n";
NamespaceScope h_namespaces(h_contents, {"v8_debug_helper_internal"});
NamespaceScope cc_namespaces(cc_contents, {"v8_debug_helper_internal"});
std::stringstream visitor;
visitor << "\nclass TqObjectVisitor {\n";
visitor << " public:\n";
visitor << " virtual void VisitObject(const TqObject* object) {}\n";
std::unordered_set<const ClassType*> done;
for (const TypeAlias* alias : GlobalContext::GetClasses()) {
const ClassType* type = ClassType::DynamicCast(alias->type());
GenerateClassDebugReader(*type, h_contents, cc_contents, visitor, &done);
}
visitor << "};\n";
h_contents << visitor.str();
}
WriteFile(output_directory + "/" + file_name + ".h", h_contents.str());
WriteFile(output_directory + "/" + file_name + ".cc", cc_contents.str());
}
} // namespace torque
} // namespace internal
} // namespace v8