https://gcc.gnu.org/g:3cfacb21cf4ff905386f98547c9d0d412c43abee
commit 3cfacb21cf4ff905386f98547c9d0d412c43abee
Author: Jakub Dupak <d...@jakubdupak.com>
Date: Tue Jan 23 12:29:25 2024 +0100
TyTy: Region (lifetime) representation
gcc/rust/ChangeLog:
* typecheck/rust-tyty-region.h: New file.
Signed-off-by: Jakub Dupak <d...@jakubdupak.com>
Diff:
---
gcc/rust/typecheck/rust-tyty-region.h | 110 ++++++++++++++++++++++++++++++++++
1 file changed, 110 insertions(+)
diff --git a/gcc/rust/typecheck/rust-tyty-region.h
b/gcc/rust/typecheck/rust-tyty-region.h
new file mode 100644
index 000000000000..b34a2115e7a1
--- /dev/null
+++ b/gcc/rust/typecheck/rust-tyty-region.h
@@ -0,0 +1,110 @@
+#ifndef RUST_TYTY_REGION_H
+#define RUST_TYTY_REGION_H
+
+namespace Rust {
+namespace TyTy {
+
+class Region
+{
+ enum Variant : uint8_t
+ {
+ UNRESOLVED,
+ STATIC,
+ EARLY_BOUND,
+ LATE_BOUND,
+ NAMED,
+ ANONYMOUS,
+ ERASED,
+ };
+
+ uint32_t index;
+ uint16_t debruijn_index;
+ Variant variant;
+
+public:
+ Region () : Region (UNRESOLVED) {}
+ Region (const Region &other)
+ : index (other.index), debruijn_index (other.debruijn_index),
+ variant (other.variant)
+ {}
+ Region (Region &&other) noexcept
+ : index (other.index), debruijn_index (other.debruijn_index),
+ variant (other.variant)
+ {}
+ Region &operator= (const Region &other)
+ {
+ if (this == &other)
+ return *this;
+ index = other.index;
+ debruijn_index = other.debruijn_index;
+ variant = other.variant;
+ return *this;
+ }
+ Region &operator= (Region &&other) noexcept
+ {
+ if (this == &other)
+ return *this;
+ index = other.index;
+ debruijn_index = other.debruijn_index;
+ variant = other.variant;
+ return *this;
+ }
+
+ static Region make_static () { return Region (STATIC); }
+ static Region make_early_bound (uint32_t index)
+ {
+ return Region (EARLY_BOUND, index);
+ }
+ static Region make_late_bound (uint32_t index, uint16_t debruijn_index)
+ {
+ return Region (LATE_BOUND, index, debruijn_index);
+ }
+ static Region make_named (uint32_t index) { return Region (NAMED, index); }
+ static Region make_anonymous () { return Region (ANONYMOUS); }
+ static Region make_erased () { return Region (ERASED); }
+
+ size_t get_index () const { return index; }
+
+ bool is_static () const { return variant == STATIC; }
+ bool is_early_bound () const { return variant == EARLY_BOUND; }
+ bool is_late_bound () const { return variant == LATE_BOUND; }
+ bool is_named () const { return variant == NAMED; }
+ bool is_anonymous () const { return variant == ANONYMOUS; }
+
+ void shift_down () { debruijn_index++; }
+
+ WARN_UNUSED_RESULT std::string as_string () const
+ {
+ switch (variant)
+ {
+ case UNRESOLVED:
+ return "'unresolved";
+ case STATIC:
+ return "'static";
+ case EARLY_BOUND:
+ return "'early(" + std::to_string (index) + ")";
+ case LATE_BOUND:
+ return "'late(" + std::to_string (debruijn_index) + ", "
+ + std::to_string (index) + ")";
+ case NAMED:
+ return "'named(" + std::to_string (index) + "";
+ case ANONYMOUS:
+ return "'_";
+ case ERASED:
+ return "'erased";
+ }
+
+ rust_unreachable ();
+ }
+
+private:
+ explicit Region (Variant variant, uint32_t index = 0,
+ uint16_t debruijn_index = 0)
+ : index (index), debruijn_index (debruijn_index), variant (variant)
+ {}
+};
+
+} // namespace TyTy
+} // namespace Rust
+
+#endif // RUST_TYTY_REGION_H
