mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-05-13 14:42:51 +00:00
4f2c0e9968
This patch adds a custom JS Object type that will convert written properties to their C++ equivalents, reflecting JS writes back to the debugging session. This is better than a simple proxy because printing this custom object works as expected because properties still exist on the object as existing handlers expect.
117 lines
4.2 KiB
C++
117 lines
4.2 KiB
C++
/*
|
|
* Copyright (c) 2021, Hunter Salyer <thefalsehonesty@gmail.com>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include "DebuggerGlobalJSObject.h"
|
|
#include "Debugger.h"
|
|
#include "DebuggerVariableJSObject.h"
|
|
#include <LibJS/Runtime/Object.h>
|
|
#include <LibJS/Runtime/ProxyObject.h>
|
|
|
|
namespace HackStudio {
|
|
|
|
DebuggerGlobalJSObject::DebuggerGlobalJSObject()
|
|
{
|
|
auto regs = Debugger::the().session()->get_registers();
|
|
auto lib = Debugger::the().session()->library_at(regs.eip);
|
|
if (!lib)
|
|
return;
|
|
m_variables = lib->debug_info->get_variables_in_current_scope(regs);
|
|
}
|
|
|
|
JS::Value DebuggerGlobalJSObject::get(const JS::PropertyName& name, JS::Value receiver, bool without_side_effects) const
|
|
{
|
|
if (m_variables.is_empty() || !name.is_string())
|
|
return JS::Object::get(name, receiver, without_side_effects);
|
|
|
|
auto it = m_variables.find_if([&](auto& variable) {
|
|
return variable->name == name.as_string();
|
|
});
|
|
if (it.is_end())
|
|
return JS::Object::get(name, receiver, without_side_effects);
|
|
auto& target_variable = **it;
|
|
auto js_value = debugger_to_js(target_variable);
|
|
if (js_value.has_value())
|
|
return js_value.value();
|
|
auto error_string = String::formatted("Variable {} of type {} is not convertible to a JS Value", name.as_string(), target_variable.type_name);
|
|
vm().throw_exception<JS::TypeError>(const_cast<DebuggerGlobalJSObject&>(*this), error_string);
|
|
return {};
|
|
}
|
|
|
|
bool DebuggerGlobalJSObject::put(const JS::PropertyName& name, JS::Value value, JS::Value receiver)
|
|
{
|
|
if (m_variables.is_empty() || !name.is_string())
|
|
return JS::Object::put(name, value, receiver);
|
|
|
|
auto it = m_variables.find_if([&](auto& variable) {
|
|
return variable->name == name.as_string();
|
|
});
|
|
if (it.is_end())
|
|
return JS::Object::put(name, value, receiver);
|
|
auto& target_variable = **it;
|
|
auto debugger_value = js_to_debugger(value, target_variable);
|
|
if (debugger_value.has_value())
|
|
return Debugger::the().session()->poke((u32*)target_variable.location_data.address, debugger_value.value());
|
|
auto error_string = String::formatted("Cannot convert JS value {} to variable {} of type {}", value.to_string_without_side_effects(), name.as_string(), target_variable.type_name);
|
|
vm().throw_exception<JS::TypeError>(const_cast<DebuggerGlobalJSObject&>(*this), error_string);
|
|
return {};
|
|
}
|
|
|
|
Optional<JS::Value> DebuggerGlobalJSObject::debugger_to_js(const Debug::DebugInfo::VariableInfo& variable) const
|
|
{
|
|
if (variable.location_type != Debug::DebugInfo::VariableInfo::LocationType::Address)
|
|
return {};
|
|
|
|
auto variable_address = variable.location_data.address;
|
|
|
|
if (variable.is_enum_type() || variable.type_name == "int") {
|
|
auto value = Debugger::the().session()->peek((u32*)variable_address);
|
|
VERIFY(value.has_value());
|
|
return JS::Value((i32)value.value());
|
|
}
|
|
|
|
if (variable.type_name == "char") {
|
|
auto value = Debugger::the().session()->peek((u32*)variable_address);
|
|
VERIFY(value.has_value());
|
|
return JS::Value((char)value.value());
|
|
}
|
|
|
|
if (variable.type_name == "bool") {
|
|
auto value = Debugger::the().session()->peek((u32*)variable_address);
|
|
VERIFY(value.has_value());
|
|
return JS::Value(value.value() != 0);
|
|
}
|
|
|
|
auto* object = DebuggerVariableJSObject::create(const_cast<DebuggerGlobalJSObject&>(*this), variable);
|
|
for (auto& member : variable.members) {
|
|
auto member_value = debugger_to_js(member);
|
|
if (!member_value.has_value())
|
|
continue;
|
|
object->put(member.name, member_value.value(), {});
|
|
}
|
|
object->finish_writing_properties();
|
|
|
|
return JS::Value(object);
|
|
}
|
|
|
|
Optional<u32> DebuggerGlobalJSObject::js_to_debugger(JS::Value value, const Debug::DebugInfo::VariableInfo& variable) const
|
|
{
|
|
if (value.is_string() && variable.type_name == "char") {
|
|
auto string = value.as_string().string();
|
|
if (string.length() != 1)
|
|
return {};
|
|
return string[0];
|
|
}
|
|
|
|
if (value.is_number() && (variable.is_enum_type() || variable.type_name == "int"))
|
|
return value.as_u32();
|
|
|
|
if (value.is_boolean() && variable.type_name == "bool")
|
|
return value.as_bool();
|
|
|
|
return {};
|
|
}
|
|
|
|
}
|