blt-gp/src/tree.cpp

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/*
* <Short Description>
* Copyright (C) 2024 Brett Terpstra
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <blt/gp/tree.h>
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#include <blt/gp/stack.h>
#include <blt/std/assert.h>
#include <blt/std/logging.h>
#include <blt/gp/program.h>
#include <stack>
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namespace blt::gp
{
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// this one will copy previous bytes over
template<typename T>
blt::span<blt::u8> get_pointer_for_size(blt::size_t size)
{
static blt::span<blt::u8> buffer{nullptr, 0};
if (buffer.size() < size)
{
delete[] buffer.data();
buffer = {new blt::u8[size], size};
}
return buffer;
}
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inline auto empty_callable = detail::callable_t(
[](void*, stack_allocator&, stack_allocator&, detail::bitmask_t*) { BLT_ABORT("This should never be called!"); });
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evaluation_context tree_t::evaluate(void* context) const
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{
#if BLT_DEBUG_LEVEL >= 2
blt::size_t expected_bytes = 0;
blt::size_t found_bytes = values.size().total_used_bytes;
for (const auto& op : operations)
{
if (op.is_value)
expected_bytes += stack_allocator::aligned_size(op.type_size);
}
if (expected_bytes != found_bytes)
{
BLT_WARN("Bytes found %ld vs bytes expected %ld", found_bytes, expected_bytes);
BLT_ABORT("Amount of bytes in stack doesn't match the number of bytes expected for the operations");
}
#endif
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// copy the initial values
evaluation_context results{};
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auto value_stack = values;
auto& values_process = results.values;
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static thread_local detail::bitmask_t bitfield;
bitfield.clear();
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for (const auto& operation : blt::reverse_iterate(operations.begin(), operations.end()))
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{
if (operation.is_value)
{
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value_stack.transfer_bytes(values_process, operation.type_size);
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bitfield.push_back(false);
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continue;
}
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operation.func(context, values_process, values_process, &bitfield);
bitfield.push_back(true);
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}
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return results;
}
std::ostream& create_indent(std::ostream& out, blt::size_t amount, bool pretty_print)
{
if (!pretty_print)
return out;
for (blt::size_t i = 0; i < amount; i++)
out << '\t';
return out;
}
std::string_view end_indent(bool pretty_print)
{
return pretty_print ? "\n" : "";
}
std::string get_return_type(gp_program& program, type_id id, bool use_returns)
{
if (!use_returns)
return "";
return "(" + std::string(program.get_typesystem().get_type(id).name()) + ")";
}
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void tree_t::print(gp_program& program, std::ostream& out, bool print_literals, bool pretty_print, bool include_types) const
{
std::stack<blt::size_t> arguments_left;
blt::size_t indent = 0;
stack_allocator reversed;
if (print_literals)
{
// I hate this.
stack_allocator copy = values;
// reverse the order of the stack
for (const auto& v : operations)
{
if (v.is_value)
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copy.transfer_bytes(reversed, v.type_size);
}
}
for (const auto& v : operations)
{
auto info = program.get_operator_info(v.id);
auto name = program.get_name(v.id) ? program.get_name(v.id).value() : "NULL";
auto return_type = get_return_type(program, info.return_type, include_types);
if (info.argc.argc > 0)
{
create_indent(out, indent, pretty_print) << "(";
indent++;
arguments_left.emplace(info.argc.argc);
out << name << return_type << end_indent(pretty_print);
} else
{
if (print_literals)
{
create_indent(out, indent, pretty_print);
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if (program.is_static(v.id))
program.get_print_func(v.id)(out, reversed);
else
out << name;
out << return_type << end_indent(pretty_print);
} else
create_indent(out, indent, pretty_print) << name << return_type << end_indent(pretty_print);
}
while (!arguments_left.empty())
{
auto top = arguments_left.top();
arguments_left.pop();
if (top == 0)
{
indent--;
create_indent(out, indent, pretty_print) << ")" << end_indent(pretty_print);
continue;
} else
{
if (!pretty_print)
out << " ";
arguments_left.push(top - 1);
break;
}
}
}
while (!arguments_left.empty())
{
auto top = arguments_left.top();
arguments_left.pop();
if (top == 0)
{
indent--;
create_indent(out, indent, pretty_print) << ")" << end_indent(pretty_print);
continue;
} else
{
BLT_ERROR("Failed to print tree correctly!");
break;
}
}
out << '\n';
}
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blt::size_t tree_t::get_depth(gp_program& program)
{
blt::size_t depth = 0;
auto operations_stack = operations;
std::vector<blt::size_t> values_process;
std::vector<blt::size_t> value_stack;
for (const auto& op : operations_stack)
{
if (op.is_value)
value_stack.push_back(1);
}
while (!operations_stack.empty())
{
auto operation = operations_stack.back();
// keep the last value in the stack on the process stack stored in the eval context, this way it can be accessed easily.
operations_stack.pop_back();
if (operation.is_value)
{
auto d = value_stack.back();
depth = std::max(depth, d);
values_process.push_back(d);
value_stack.pop_back();
continue;
}
blt::size_t local_depth = 0;
for (blt::size_t i = 0; i < program.get_operator_info(operation.id).argc.argc; i++)
{
local_depth = std::max(local_depth, values_process.back());
values_process.pop_back();
}
value_stack.push_back(local_depth + 1);
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operations_stack.emplace_back(empty_callable, operation.type_size, operation.id, true);
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}
return depth;
}
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blt::ptrdiff_t tree_t::find_endpoint(gp_program& program, blt::ptrdiff_t index) const
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{
blt::i64 children_left = 0;
do
{
const auto& type = program.get_operator_info(operations[index].id);
// this is a child to someone
if (children_left != 0)
children_left--;
if (type.argc.argc > 0)
children_left += type.argc.argc;
index++;
} while (children_left > 0);
return index;
}
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// this function doesn't work!
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blt::ptrdiff_t tree_t::find_parent(gp_program& program, blt::ptrdiff_t index) const
{
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blt::i64 children_left = 0;
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do
{
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if (index == 0)
return 0;
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const auto& type = program.get_operator_info(operations[index].id);
if (type.argc.argc > 0)
children_left -= type.argc.argc;
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children_left++;
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if (children_left <= 0)
break;
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--index;
} while (true);
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return index;
}
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bool tree_t::check(gp_program& program, void* context) const
{
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static thread_local detail::bitmask_t bitfield;
bitfield.clear();
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blt::size_t bytes_expected = 0;
auto bytes_size = values.size().total_used_bytes;
for (const auto& op : get_operations())
{
if (op.is_value)
bytes_expected += stack_allocator::aligned_size(op.type_size);
}
if (bytes_expected != bytes_size)
{
BLT_WARN_STREAM << "Stack state: " << values.size() << "\n";
BLT_WARN("Child tree bytes %ld vs expected %ld, difference: %ld", bytes_size, bytes_expected,
static_cast<blt::ptrdiff_t>(bytes_expected) - static_cast<blt::ptrdiff_t>(bytes_size));
BLT_WARN("Amount of bytes in stack doesn't match the number of bytes expected for the operations");
return false;
}
// copy the initial values
evaluation_context results{};
auto value_stack = values;
auto& values_process = results.values;
blt::size_t total_produced = 0;
blt::size_t total_consumed = 0;
for (const auto& operation : blt::reverse_iterate(operations.begin(), operations.end()))
{
if (operation.is_value)
{
value_stack.transfer_bytes(values_process, operation.type_size);
total_produced += stack_allocator::aligned_size(operation.type_size);
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bitfield.push_back(false);
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continue;
}
auto& info = program.get_operator_info(operation.id);
for (auto& arg : info.argument_types)
total_consumed += stack_allocator::aligned_size(program.get_typesystem().get_type(arg).size());
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operation.func(context, values_process, values_process, &bitfield);
bitfield.push_back(true);
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total_produced += stack_allocator::aligned_size(program.get_typesystem().get_type(info.return_type).size());
}
auto v1 = results.values.bytes_in_head();
auto v2 = static_cast<blt::ptrdiff_t>(stack_allocator::aligned_size(operations.front().type_size));
if (v1 != v2)
{
auto vd = std::abs(v1 - v2);
BLT_ERROR("found %ld bytes expected %ld bytes, total difference: %ld", v1, v2, vd);
BLT_ERROR("Total Produced %ld || Total Consumed %ld || Total Difference %ld", total_produced, total_consumed,
std::abs(static_cast<blt::ptrdiff_t>(total_produced) - static_cast<blt::ptrdiff_t>(total_consumed)));
return false;
}
return true;
}
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void tree_t::drop(gp_program& program)
{
return;
if (values.empty())
return;
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//std::cout << "---- NEW TREE ---- References " << *reference_counter << " ----" << std::endl;
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if (reference_counter->load() > 1)
return;
static blt::hashset_t<blt::size_t> sets;
while (!operations.empty())
{
auto operation = operations.back();
if (operation.is_value)
{
struct hello
{
float* f;
blt::size_t i;
};
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//auto h = values.from<hello>(0);
/*if (sets.find(h.i) != sets.end())
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std::cout << "HEY ASSHOLE Duplicate Value " << h.i << std::endl;
else
{
std::cout << "Destroying Value " << h.i << std::endl;
sets.insert(h.i);
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}*/
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program.get_destroy_func(operation.id)(detail::destroy_t::RETURN, nullptr, values);
values.pop_bytes(static_cast<blt::ptrdiff_t>(stack_allocator::aligned_size(operation.type_size)));
}
operations.pop_back();
}
}
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void tree_t::find_child_extends(gp_program& program, std::vector<child_t>& vec, blt::size_t parent_node, blt::size_t argc) const
{
while (vec.size() < argc)
{
auto current_point = vec.size();
child_t prev{};
if (current_point == 0)
{
// first child.
prev = {static_cast<blt::ptrdiff_t>(parent_node + 1),
find_endpoint(program, static_cast<blt::ptrdiff_t>(parent_node + 1))};
vec.push_back(prev);
continue;
} else
prev = vec[current_point - 1];
child_t next = {prev.end, find_endpoint(program, prev.end)};
vec.push_back(next);
}
}
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void population_t::drop(gp_program& program)
{
for (auto& pop : get_individuals())
pop.tree.drop(program);
}
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}