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feat(furvm): implement constants

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Closes: #13
This commit is contained in:
Aleksander Krajewski
2026-09-01 17:18:01 +02:00
parent 12a131c2b8
commit 5e425d7fe4
5 changed files with 76 additions and 66 deletions
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furvm/src/executor.cpp
+19 -1
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@@ -222,6 +222,25 @@ void executor::step() {
push_thing({ (struct thing_type){ thing_type::U32 } }).get<thing_type::u32>() =
static_cast<thing_type::u32>(instr.arg.u8);
} break;
case instruction_t::PushConstant: {
auto constant = frame.mod->constant_at(instr.arg.u16);
switch (constant.type) {
case constant::S32:
push_thing({ (struct thing_type){ thing_type::S32 } }).get<thing_type::s32>() = constant.s32; // NOLINT
break;
case constant::U32:
push_thing({ (struct thing_type){ thing_type::U32 } }).get<thing_type::u32>() = constant.u32; // NOLINT
break;
case constant::S64:
push_thing({ (struct thing_type){ thing_type::S64 } }).get<thing_type::s64>() = constant.s64; // NOLINT
break;
case constant::U64:
push_thing({ (struct thing_type){ thing_type::U64 } }).get<thing_type::u64>() = constant.u64; // NOLINT
break;
case constant::String: throw std::runtime_error("unimplemented");
default: throw std::runtime_error("invalid constant");
}
} break;
case instruction_t::Array: {
const auto& type = *mod_to_thing_type(frame.mod, *frame.mod->type_at(instr.arg.u32));
if (type.type != thing_type::Array || type.value.array.type == nullptr || type.value.array.type == &type)
@@ -377,7 +396,6 @@ void executor::step() {
pop_frame();
if (m_frames.empty()) m_flags = m_flags | executor_flags::Done;
} break;
case instruction_t::PushConstant: throw std::runtime_error("unimplemented");
default: throw std::runtime_error("unknown instruction");
}
}
furvm/src/instruction.cpp
+1 -1
View File
@@ -22,7 +22,7 @@ const std::size_t instruction_argument::s_sizes[instruction_argument::Count] = {
// U32
1,
// Constant:
4,
2,
// Type:
4,
// Variable:
furvm/src/module.cpp
+29
View File
@@ -16,6 +16,19 @@ std::ostream& mod::serialize(std::ostream& os) const {
os.write(MAGIC, sizeof(MAGIC));
detail::serialize(os, std::uint32_t(0)); // version
detail::serialize(os, static_cast<constant_index>(m_constants.size()));
for (const auto& constant : m_constants) {
detail::serialize(os, constant.type);
switch (constant.type) {
case constant::S32:
case constant::U32: detail::serialize(os, constant.u32); break;
case constant::S64:
case constant::U64: detail::serialize(os, constant.u64); break;
case constant::String: throw std::runtime_error("unimplemented");
default: throw std::runtime_error("unreachable");
}
}
mod_type_id typeCount = mod_type_id(m_types.cend() - m_types.cbegin());
detail::serialize(os, typeCount);
for (mod_type_id id = 0; id < typeCount; ++id) {
@@ -104,6 +117,22 @@ mod mod::load(std::istream& is) {
mod mod;
constant_index constantCount = 0;
detail::load(is, constantCount);
mod.m_constants.reserve(constantCount);
for (; constantCount != 0; --constantCount) {
constant constant{};
detail::load(is, reinterpret_cast<std::uint32_t&>(constant.type));
switch (constant.type) {
case constant::S32:
case constant::U32: detail::load(is, constant.u32); break;
case constant::S64:
case constant::U64: detail::load(is, constant.u64); break;
case constant::String: throw std::runtime_error("unimplemented");
default: throw std::runtime_error("unreachable");
}
}
mod_type_id typeCount = 0;
detail::load(is, typeCount);
for (mod_type_id id = 0; id < typeCount; ++id) {