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Use a custom generic tagged union Either instead of std::variant for efficiency (#1476)

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* Implement custom generic tagged union `Either`

This should be more efficient than `std::variant`, while still
keeping runtime safety as it `assert`s when `get`ting values.

* Use `Either` for RPN expressions

* Use `Either` for file stack node data

* Use `Either` for `File` buffer

* Use `Either` for `STRFMT` args

* Use `Either` for RGBLINK symbol values

* Support an equivalent of `std::monostate` for `Either`

* Use `Either` for lexer tokens

* Use `Either` for symbol values

* Use `Either` for lexer mmap/buffer state
This commit is contained in:
Sylvie
2024-08-20 15:19:11 -04:00
committed by GitHub
parent 7d98b9a900
commit 57c3d74b9e
17 changed files with 303 additions and 174 deletions
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22
src/link/main.cpp
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@@ -46,28 +46,8 @@ FILE *linkerScript;
static uint32_t nbErrors = 0;
std::vector<uint32_t> &FileStackNode::iters() {
assume(std::holds_alternative<std::vector<uint32_t>>(data));
return std::get<std::vector<uint32_t>>(data);
}
std::vector<uint32_t> const &FileStackNode::iters() const {
assume(std::holds_alternative<std::vector<uint32_t>>(data));
return std::get<std::vector<uint32_t>>(data);
}
std::string &FileStackNode::name() {
assume(std::holds_alternative<std::string>(data));
return std::get<std::string>(data);
}
std::string const &FileStackNode::name() const {
assume(std::holds_alternative<std::string>(data));
return std::get<std::string>(data);
}
std::string const &FileStackNode::dump(uint32_t curLineNo) const {
if (std::holds_alternative<std::vector<uint32_t>>(data)) {
if (data.holds<std::vector<uint32_t>>()) {
assume(parent); // REPT nodes use their parent's name
std::string const &lastName = parent->dump(lineNo);
fputs(" -> ", stderr);