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Write parts of generated code directly to objects

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This commit is contained in:
Eugen Wissner
2024-03-18 09:55:25 +01:00
parent 27197c7725
commit e7d8f9116a
7 changed files with 246 additions and 189 deletions
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165
include/elna/backend/riscv.hpp
View File

@ -1,8 +1,7 @@
#pragma once
#include <charconv>
#include <cstdint>
#include <algorithm>
#include <functional>
#include "elna/source/parser.hpp"
namespace elna::riscv
@ -159,169 +158,20 @@ namespace elna::riscv
std::uint32_t representation{ 0 };
};
/**
* Assigns sequentially numbered labels to text strings.
*/
template<char... prefix>
struct read_only_table
{
private:
constexpr static const char get_prefix[] = { prefix... };
constexpr static const std::size_t prefix_length = sizeof(get_prefix) / sizeof(char);
public:
/**
* An iterator over label and string pairs.
*/
struct const_iterator
{
using iterator_category = std::forward_iterator_tag;
using difference_type = ptrdiff_t;
using value_type = std::pair<std::string, std::string_view>;
using pointer = const value_type *;
using reference = const value_type&;
reference operator*() const noexcept
{
return payload;
}
pointer operator->() const noexcept
{
return &payload;
}
const_iterator& operator++()
{
++index;
++iterator;
this->payload = std::pair<const std::string, std::string_view>(label(), *iterator);
return *this;
}
const_iterator& operator++(int)
{
auto tmp = *this;
++(*this);
return *this;
}
bool operator==(const const_iterator& that) const
{
return this->index == that.index;
}
bool operator!=(const const_iterator& that) const
{
return !(*this == that);
}
private:
std::vector<std::string>::const_iterator iterator;
std::size_t index;
value_type payload;
const_iterator(std::size_t index, std::vector<std::string>::const_iterator iterator)
: iterator(iterator), index(index), payload({ label(), *iterator })
{
}
const_iterator(std::size_t index, std::vector<std::string>::const_iterator iterator,
std::string_view value)
: iterator(iterator), index(index), payload({ get_prefix, value })
{
}
std::string label() const
{
return get_prefix + std::to_string(this->index);
}
friend read_only_table;
};
const_iterator begin()
{
if (payload.empty())
{
return end();
}
else
{
return read_only_table::const_iterator(0, payload.cbegin());
}
}
const_iterator end() const
{
return read_only_table::const_iterator(size(), payload.cend(), "");
}
std::size_t size() const
{
return payload.size();
}
/**
* Looks up \a needle in the string storage and returns a label for it
* or create a new one.
*
* \param needle A string to search for.
* \return Label name.
*/
const_iterator label(std::string_view needle)
{
auto format_string = std::find(this->payload.cbegin(), this->payload.cend(), needle);
if (format_string == this->payload.cend())
{
format_string = this->payload.emplace(format_string, needle);
}
auto read_only_index = std::distance(this->payload.cbegin(), format_string);
return read_only_table::const_iterator(read_only_index, format_string);
}
/**
* Searches the content by label and returns its index or -1 when the
* label does not exist.
*
* \param needle Label name.
* \return Data index.
*/
std::ptrdiff_t lookup(std::string_view needle)
{
if (needle.size() <= prefix_length)
{
return -1;
}
auto needle_middle = needle.cbegin() + prefix_length;
auto needle_prefix = std::string_view(needle.cbegin(), prefix_length);
std::size_t counter;
auto [position, char_error] = std::from_chars(needle_middle, needle.cend(), counter);
if (char_error != std::errc{} || position != needle.cend()
|| needle_prefix != get_prefix || counter >= size())
{
return -1;
}
return counter;
}
private:
std::vector<std::string> payload;
};
class visitor final : public source::parser_visitor
{
std::function<void(const std::string&, const std::byte *, std::size_t)> write_text;
std::function<std::string_view(const std::byte *, std::size_t)> write_read_only;
public:
std::vector<instruction> instructions;
bool register_in_use{ true };
std::uint32_t variable_counter = 1;
std::vector<reference> references;
std::shared_ptr<source::symbol_table> table;
read_only_table<'.', 'C', 'L'> read_only;
visitor(std::function<void(const std::string&, const std::byte *, std::size_t)> write_text,
std::function<std::string_view(const std::byte *, std::size_t)> write_read_only);
virtual void visit(source::declaration *declaration) override;
virtual void visit(source::definition *definition) override;
@ -332,6 +182,7 @@ namespace elna::riscv
virtual void visit(source::if_statement *statement) override;
virtual void visit(source::while_statement *statement) override;
virtual void visit(source::block *block) override;
virtual void visit(source::program *program) override;
virtual void visit(source::variable_expression *variable) override;
virtual void visit(source::binary_expression *expression) override;
virtual void visit(source::integer_literal *number) override;

75
include/elna/backend/target.hpp
View File

@ -1,7 +1,80 @@
#include "elna/source/parser.hpp"
#include <filesystem>
#include <elfio/elfio.hpp>
namespace elna::riscv
{
void riscv32_elf(source::block *ast, const std::filesystem::path& out_file);
struct elfio_writer
{
struct entry
{
std::string_view label;
const std::byte *data{ nullptr };
std::size_t size{ 0 };
};
/**
* An iterator over label and string pairs.
*/
struct iterator
{
using iterator_category = std::forward_iterator_tag;
using difference_type = ptrdiff_t;
using value_type = entry;
using pointer = const value_type *;
using reference = const value_type&;
reference operator*() const noexcept;
pointer operator->() const noexcept;
iterator& operator++();
iterator& operator++(int);
bool operator==(const iterator& that) const;
bool operator!=(const iterator& that) const;
private:
std::vector<std::string>::const_iterator labels;
std::vector<std::size_t>::const_iterator sizes;
value_type payload;
iterator(std::vector<std::string>::const_iterator labels, std::vector<std::size_t>::const_iterator sizes,
const std::byte *data)
: labels(labels), sizes(sizes)
{
if (data != nullptr)
{
payload = { *this->labels, data, *this->sizes};
}
}
iterator(std::vector<std::string>::const_iterator labels, std::vector<std::size_t>::const_iterator sizes)
: labels(labels), sizes(sizes), payload{}
{
}
friend elfio_writer;
};
explicit elfio_writer(ELFIO::section *text);
void operator()(const std::string& label, const std::byte *data, std::size_t size);
std::string_view operator()(const std::byte *data, std::size_t size);
iterator begin() const;
iterator end() const;
/**
* Searches the content by label and returns its index or -1 when the
* label does not exist.
*
* \param needle Label name.
* \return Data index.
*/
std::ptrdiff_t lookup(const std::string& label);
private:
std::shared_ptr<std::vector<std::string>> labels;
std::shared_ptr<std::vector<std::size_t>> sizes;
ELFIO::section *text;
};
void riscv32_elf(source::program *ast, const std::filesystem::path& out_file);
}

17
include/elna/source/parser.hpp
View File

@ -23,6 +23,7 @@ namespace elna::source
class if_statement;
class while_statement;
class block;
class program;
class binary_expression;
class variable_expression;
class integer_literal;
@ -39,6 +40,7 @@ namespace elna::source
virtual void visit(if_statement *) = 0;
virtual void visit(while_statement *) = 0;
virtual void visit(block *) = 0;
virtual void visit(program *) = 0;
virtual void visit(binary_expression *) = 0;
virtual void visit(variable_expression *) = 0;
virtual void visit(integer_literal *) = 0;
@ -56,6 +58,7 @@ namespace elna::source
virtual void visit(if_statement *) override;
virtual void visit(while_statement *) override;
virtual void visit(block *block) override;
virtual void visit(program *program) override;
virtual void visit(binary_expression *expression) override;
virtual void visit(variable_expression *variable) override;
virtual void visit(integer_literal *number) override;
@ -186,9 +189,6 @@ namespace elna::source
statement& body();
};
/**
* Block.
*/
class block : public node
{
std::unique_ptr<statement> m_body;
@ -208,6 +208,15 @@ namespace elna::source
std::shared_ptr<symbol_table> table();
};
class program : public block
{
public:
program(std::vector<std::unique_ptr<definition>>&& definitions,
std::vector<std::unique_ptr<declaration>>&& declarations,
std::unique_ptr<statement>&& body);
virtual void accept(parser_visitor *visitor) override;
};
class integer_literal : public expression
{
std::int32_t m_number;
@ -286,7 +295,7 @@ namespace elna::source
*
* \return Parsed program or nothing if an error occurred.
*/
std::unique_ptr<block> parse();
std::unique_ptr<program> parse();
/**
* Gets produced errors.