434 lines
No EOL
11 KiB
C++
434 lines
No EOL
11 KiB
C++
#include "pslang/ast/statement_fwd.hpp"
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#include <pslang/jit/arch/aarch64/compiler.hpp>
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#include <pslang/jit/arch/aarch64/instruction_builder.hpp>
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#include <pslang/jit/executable.hpp>
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#include <pslang/ast/expression_visitor.hpp>
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#include <pslang/ast/statement_visitor.hpp>
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#include <pslang/types/type_visitor.hpp>
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#include <stdexcept>
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#include <type_traits>
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#include <unordered_map>
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#include <vector>
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namespace pslang::jit::aarch64
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{
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namespace
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{
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struct context
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{
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std::vector<std::uint8_t> code;
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std::unordered_map<std::string, std::size_t> code_symbol_table;
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};
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struct reg_extend_visitor
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: types::const_visitor<reg_extend_visitor>
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{
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using const_visitor::apply;
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instruction_builder & builder;
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std::uint8_t reg;
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void apply(types::bool_type const &)
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{}
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void apply(types::f32_type const &)
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{}
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void apply(types::f64_type const &)
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{}
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template <typename T>
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void apply(types::primitive_type_base<T> const &)
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{
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if constexpr (sizeof(T) == 8)
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{
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return;
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}
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if constexpr (std::is_signed_v<T>)
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{
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builder.sbfm(reg, reg, sizeof(T) * 8);
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}
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if constexpr (std::is_unsigned_v<T>)
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{
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builder.ubfm(reg, reg, sizeof(T) * 8);
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}
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}
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template <typename T>
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void apply(T const &)
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{
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throw std::runtime_error("Not implemented");
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}
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};
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struct compile_function_visitor
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: ast::const_statement_visitor<compile_function_visitor>
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, ast::const_expression_visitor<compile_function_visitor>
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{
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using const_statement_visitor::apply;
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using const_expression_visitor::apply;
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context & context;
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instruction_builder builder{context.code};
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// Difference between initial stack pointer at function enter
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// and current virtual stack pointer value. The actual stack pointer
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// value is rounded down to a multiple of 16
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std::uint32_t stack_offset = 0;
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struct variable_data
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{
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// Difference between initial stack pointer at scope enter
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// and the variable address
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// Must be a multiple of 8
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std::uint32_t frame_offset;
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};
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struct scope
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{
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std::unordered_map<std::string, variable_data> variables = {};
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// Difference between initial virtual stack pointer at scope enter
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// and current virtual stack pointer value
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std::uint32_t stack_offset = 0;
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};
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std::vector<scope> scopes;
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template <typename Node>
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void apply(Node const &)
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{
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throw std::runtime_error("Not implemented");
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}
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void apply(ast::bool_literal const & node)
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{
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if (node.value)
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set_m1(0);
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else
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builder.movz(0, 0);
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}
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template <typename T>
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requires(std::is_integral_v<T> && !std::is_same_v<T, bool>)
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void apply(ast::primitive_literal_base<T> const & node)
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{
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for (std::size_t i = 0; i < sizeof(T); i += 2)
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{
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if (i == 0)
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{
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builder.movz(0, std::uint64_t(node.value));
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}
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else
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{
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auto val = std::uint16_t(std::uint64_t(node.value) >> (i * 16));
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if (val != 0) builder.movk(0, val, i / 2);
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}
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}
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if (sizeof(T) < 8)
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{
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if constexpr (std::is_signed_v<T>)
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{
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if (node.value < 0)
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builder.sbfm(0, 0, sizeof(T) * 8);
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}
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}
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}
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void apply(ast::identifier const & node)
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{
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for (auto it = scopes.rbegin(); it != scopes.rend(); ++it)
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{
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if (auto jt = it->variables.find(node.name); jt != it->variables.end())
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{
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builder.ldr(0, 31, (stack_offset - jt->second.frame_offset) / 8);
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break;
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}
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}
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}
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void apply(ast::unary_operation const & node)
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{
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// TODO: floating-point
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switch (node.type)
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{
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case ast::unary_operation_type::negation:
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apply(*node.arg1);
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builder.sub_reg(31, 0, 0);
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extend(0, node.inferred_type);
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break;
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case ast::unary_operation_type::logical_not:
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apply(*node.arg1);
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builder.or_not_reg(31, 0, 0);
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break;
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}
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}
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void apply(ast::binary_operation const & node)
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{
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// TODO: floating-point
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switch (node.type)
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{
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case ast::binary_operation_type::addition:
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apply(*node.arg1);
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push(0);
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apply(*node.arg2);
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pop(1);
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builder.add_reg(1, 0, 0);
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extend(0, node.inferred_type);
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break;
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case ast::binary_operation_type::subtraction:
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apply(*node.arg1);
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push(0);
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apply(*node.arg2);
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pop(1);
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builder.sub_reg(1, 0, 0);
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extend(0, node.inferred_type);
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break;
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case ast::binary_operation_type::multiplication:
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apply(*node.arg1);
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push(0);
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apply(*node.arg2);
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pop(1);
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builder.mul_reg(1, 0, 0);
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extend(0, node.inferred_type);
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break;
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case ast::binary_operation_type::division:
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apply(*node.arg1);
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push(0);
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apply(*node.arg2);
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pop(1);
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if (types::is_signed_integer_type(*node.inferred_type))
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builder.sdiv_reg(1, 0, 0);
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else
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builder.udiv_reg(1, 0, 0);
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extend(0, node.inferred_type);
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break;
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case ast::binary_operation_type::remainder:
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// TODO: implement via div & mul & sub
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throw std::runtime_error("Not implemented");
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case ast::binary_operation_type::logical_and:
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apply(*node.arg1);
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push(0);
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apply(*node.arg2);
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pop(1);
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builder.and_reg(1, 0, 0);
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break;
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case ast::binary_operation_type::logical_or:
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apply(*node.arg1);
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push(0);
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apply(*node.arg2);
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pop(1);
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builder.or_reg(1, 0, 0);
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break;
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case ast::binary_operation_type::logical_xor:
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apply(*node.arg1);
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push(0);
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apply(*node.arg2);
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pop(1);
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builder.xor_reg(1, 0, 0);
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break;
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case ast::binary_operation_type::equals:
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apply(*node.arg1);
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push(0);
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apply(*node.arg2);
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pop(1);
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builder.cmp_reg(1, 0);
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builder.csetm(0, 0b0000);
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break;
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case ast::binary_operation_type::not_equals:
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apply(*node.arg1);
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push(0);
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apply(*node.arg2);
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pop(1);
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builder.cmp_reg(1, 0);
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builder.csetm(0, 0b0001);
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break;
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case ast::binary_operation_type::less:
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apply(*node.arg1);
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push(0);
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apply(*node.arg2);
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pop(1);
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builder.cmp_reg(0, 1);
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if (types::is_bool_type(*ast::get_type(*node.arg1)) || types::is_unsigned_integer_type(*ast::get_type(*node.arg1)))
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builder.csetm(0, 0b1000);
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else
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builder.csetm(0, 0b1100);
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break;
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case ast::binary_operation_type::greater:
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apply(*node.arg1);
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push(0);
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apply(*node.arg2);
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pop(1);
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if (types::is_bool_type(*ast::get_type(*node.arg1)) || types::is_unsigned_integer_type(*ast::get_type(*node.arg1)))
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builder.csetm(0, 0b1000);
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else
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builder.csetm(0, 0b1100);
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break;
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case ast::binary_operation_type::less_equals:
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apply(*node.arg1);
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push(0);
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apply(*node.arg2);
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pop(1);
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builder.cmp_reg(1, 0);
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if (types::is_bool_type(*ast::get_type(*node.arg1)) || types::is_unsigned_integer_type(*ast::get_type(*node.arg1)))
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builder.csetm(0, 0b1001);
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else
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builder.csetm(0, 0b1101);
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break;
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case ast::binary_operation_type::greater_equals:
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apply(*node.arg1);
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push(0);
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apply(*node.arg2);
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pop(1);
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builder.cmp_reg(0, 1);
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if (types::is_bool_type(*ast::get_type(*node.arg1)) || types::is_unsigned_integer_type(*ast::get_type(*node.arg1)))
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builder.csetm(0, 0b1001);
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else
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builder.csetm(0, 0b1101);
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break;
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default:
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throw std::runtime_error("Not implemented");
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}
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}
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void apply(ast::assignment const & node)
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{
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auto identifier = std::get_if<ast::identifier>(node.lhs.get());
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if (!identifier)
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throw std::runtime_error("Not implemented");
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apply(*node.rhs);
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for (auto it = scopes.rbegin(); it != scopes.rend(); ++it)
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{
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if (auto jt = it->variables.find(identifier->name); jt != it->variables.end())
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{
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builder.str(0, 31, (stack_offset - jt->second.frame_offset) / 8);
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break;
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}
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}
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}
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void apply(ast::variable_declaration const & node)
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{
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apply(*node.initializer);
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push(0);
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scopes.back().variables[node.name] = {.frame_offset = stack_offset};
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}
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void apply(ast::return_statement const & node)
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{
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apply(*node.value);
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if (stack_offset > 0)
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builder.add_imm(31, 31, stack_offset);
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builder.ret();
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}
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void apply(ast::function_definition const & node)
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{
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// Don't handle internal functions
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}
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void apply(ast::statement_list const & node)
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{
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for (auto const & statement : node.statements)
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apply(*statement);
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builder.add_imm(31, 31, scopes.back().stack_offset);
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}
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void do_apply(ast::function_definition const & node)
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{
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// TODO: floating-point / struct arguments
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scopes.emplace_back();
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for (std::size_t i = 0; i < node.arguments.size(); ++i)
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{
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extend(i, ast::get_type(*node.arguments[i].type));
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push(i);
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scopes.back().variables[node.arguments[i].name] = {.frame_offset = stack_offset};
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}
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apply(*node.statements);
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scopes.pop_back();
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}
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private:
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void push(std::uint8_t reg)
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{
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builder.sub_imm(31, 31, 16);
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builder.str(reg, 31, 0);
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stack_offset += 16;
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scopes.back().stack_offset += 16;
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}
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void pop(std::uint8_t reg)
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{
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builder.ldr(reg, 31, 0);
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builder.add_imm(31, 31, 16);
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stack_offset -= 16;
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scopes.back().stack_offset -= 16;
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}
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// Set register @reg to -1 (all bits = 1)
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void set_m1(std::uint8_t reg)
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{
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builder.or_not_reg(31, 31, reg);
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}
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// Sign- or zero-extend the register depending on the exact type
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void extend(std::uint8_t reg, types::type_ptr const & type)
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{
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reg_extend_visitor{{}, builder, reg}.apply(*type);
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}
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};
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struct compile_visitor
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: ast::const_statement_visitor<compile_visitor>
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{
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using const_statement_visitor::apply;
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context & context;
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instruction_builder builder{context.code};
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template <typename Statement>
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void apply(Statement const &)
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{
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throw std::runtime_error("Not implemented");
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}
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void apply(ast::function_definition const & node)
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{
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context.code_symbol_table[node.name] = context.code.size();
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compile_function_visitor visitor{{}, {}, context};
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visitor.do_apply(node);
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}
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};
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}
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compiled_module compile(ast::statement_list_ptr const & statements)
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{
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context context;
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compile_visitor visitor{{}, context};
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visitor.apply(*statements);
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auto code = allocate(context.code.size());
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std::copy(context.code.data(), context.code.data() + context.code.size(), code.data.get());
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return compiled_module {
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.data = {},
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.code = {
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.memory = std::move(code),
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.symbol_table = std::move(context.code_symbol_table),
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},
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.entry_point = 0,
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.abi = abi::armv8,
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};
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}
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} |