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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "DisassemblyModel.h"
#include "Gradient.h"
#include "Profile.h"
#include <LibCore/MappedFile.h>
#include <LibDebug/DebugInfo.h>
#include <LibELF/Image.h>
#include <LibSymbolication/Symbolication.h>
#include <LibX86/Disassembler.h>
#include <LibX86/ELFSymbolProvider.h>
#include <stdio.h>
namespace Profiler {
static Optional<MappedObject> s_kernel_binary;
static ELF::Image* try_load_kernel_binary()
{
if (s_kernel_binary.has_value())
return &s_kernel_binary->elf;
auto kernel_binary_or_error = Core::MappedFile::map("/boot/Kernel"sv);
if (!kernel_binary_or_error.is_error()) {
auto kernel_binary = kernel_binary_or_error.release_value();
s_kernel_binary = { { kernel_binary, ELF::Image(kernel_binary->bytes()) } };
return &s_kernel_binary->elf;
}
return nullptr;
}
DisassemblyModel::DisassemblyModel(Profile& profile, ProfileNode& node)
: m_profile(profile)
, m_node(node)
{
FlatPtr base_address = 0;
Debug::DebugInfo const* debug_info;
ELF::Image const* elf;
if (auto maybe_kernel_base = Symbolication::kernel_base(); maybe_kernel_base.has_value() && m_node.address() >= *maybe_kernel_base) {
if (!g_kernel_debuginfo_object.has_value())
return;
base_address = maybe_kernel_base.release_value();
elf = try_load_kernel_binary();
if (elf == nullptr)
return;
if (g_kernel_debug_info == nullptr)
g_kernel_debug_info = make<Debug::DebugInfo>(g_kernel_debuginfo_object->elf, String::empty(), base_address);
debug_info = g_kernel_debug_info.ptr();
} else {
auto const& process = node.process();
auto const* library_data = process.library_metadata.library_containing(node.address());
if (!library_data) {
dbgln("no library data for address {:p}", node.address());
return;
}
base_address = library_data->base;
elf = &library_data->object->elf;
debug_info = &library_data->load_debug_info(base_address);
}
VERIFY(elf != nullptr);
VERIFY(debug_info != nullptr);
FlatPtr function_address = node.address() - base_address;
auto is_function_address = false;
auto function = debug_info->get_containing_function(function_address);
if (function.has_value()) {
if (function_address == function->address_low)
is_function_address = true;
function_address = function->address_low;
} else {
dbgln("DisassemblyModel: Function containing {:p} ({}) not found", node.address() - base_address, node.symbol());
}
auto symbol = elf->find_symbol(function_address);
if (!symbol.has_value()) {
dbgln("DisassemblyModel: symbol not found");
return;
}
if (!symbol.value().raw_data().length()) {
dbgln("DisassemblyModel: Found symbol without code");
return;
}
VERIFY(symbol.has_value());
auto symbol_offset_from_function_start = node.address() - base_address - symbol->value();
auto view = symbol.value().raw_data().substring_view(symbol_offset_from_function_start);
X86::ELFSymbolProvider symbol_provider(*elf, base_address);
X86::SimpleInstructionStream stream((u8 const*)view.characters_without_null_termination(), view.length());
X86::Disassembler disassembler(stream);
size_t offset_into_symbol = 0;
FlatPtr last_instruction_offset = 0;
if (!is_function_address) {
FlatPtr last_instruction_address = 0;
for (auto const& event : node.events_per_address())
last_instruction_address = max(event.key, last_instruction_address);
last_instruction_offset = last_instruction_address - node.address();
}
for (;;) {
if (!is_function_address && offset_into_symbol > last_instruction_offset)
break;
auto insn = disassembler.next();
if (!insn.has_value() || !insn.value().is_valid())
break;
FlatPtr address_in_profiled_program = node.address() + offset_into_symbol;
auto disassembly = insn.value().to_string(address_in_profiled_program, &symbol_provider);
StringView instruction_bytes = view.substring_view(offset_into_symbol, insn.value().length());
u32 samples_at_this_instruction = m_node.events_per_address().get(address_in_profiled_program).value_or(0);
float percent = ((float)samples_at_this_instruction / (float)m_node.event_count()) * 100.0f;
m_instructions.append({ insn.value(), disassembly, instruction_bytes, address_in_profiled_program, samples_at_this_instruction, percent, debug_info->get_source_position_with_inlines(address_in_profiled_program - base_address) });
offset_into_symbol += insn.value().length();
}
}
int DisassemblyModel::row_count(GUI::ModelIndex const&) const
{
return m_instructions.size();
}
String DisassemblyModel::column_name(int column) const
{
switch (column) {
case Column::SampleCount:
return m_profile.show_percentages() ? "% Samples" : "# Samples";
case Column::Address:
return "Address";
case Column::InstructionBytes:
return "Insn Bytes";
case Column::Disassembly:
return "Disassembly";
case Column::SourceLocation:
return "Source Location";
default:
VERIFY_NOT_REACHED();
return {};
}
}
struct ColorPair {
Color background;
Color foreground;
};
static Optional<ColorPair> color_pair_for(InstructionData const& insn)
{
if (insn.percent == 0)
return {};
Color background = color_for_percent(insn.percent);
Color foreground;
if (insn.percent > 50)
foreground = Color::White;
else
foreground = Color::Black;
return ColorPair { background, foreground };
}
GUI::Variant DisassemblyModel::data(GUI::ModelIndex const& index, GUI::ModelRole role) const
{
auto const& insn = m_instructions[index.row()];
if (role == GUI::ModelRole::BackgroundColor) {
auto colors = color_pair_for(insn);
if (!colors.has_value())
return {};
return colors.value().background;
}
if (role == GUI::ModelRole::ForegroundColor) {
auto colors = color_pair_for(insn);
if (!colors.has_value())
return {};
return colors.value().foreground;
}
if (role == GUI::ModelRole::Display) {
if (index.column() == Column::SampleCount) {
if (m_profile.show_percentages())
return ((float)insn.event_count / (float)m_node.event_count()) * 100.0f;
return insn.event_count;
}
if (index.column() == Column::Address)
return String::formatted("{:p}", insn.address);
if (index.column() == Column::InstructionBytes) {
StringBuilder builder;
for (auto ch : insn.bytes) {
builder.appendff("{:02x} ", (u8)ch);
}
return builder.to_string();
}
if (index.column() == Column::Disassembly)
return insn.disassembly;
if (index.column() == Column::SourceLocation) {
StringBuilder builder;
auto first = true;
for (auto const& entry : insn.source_position_with_inlines.inline_chain) {
if (first)
first = false;
else
builder.append(" => "sv);
builder.appendff("{}:{}", entry.file_path, entry.line_number);
}
if (insn.source_position_with_inlines.source_position.has_value()) {
if (!first)
builder.append(" => "sv);
auto const& entry = insn.source_position_with_inlines.source_position.value();
builder.appendff("{}:{}", entry.file_path, entry.line_number);
}
return builder.build();
}
return {};
}
return {};
}
}
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