From 9680a18e05d8ad975454d837dcd73d2fa328b365 Mon Sep 17 00:00:00 2001
From: Syed Daanish <me@syedm.dev>
Date: Fri, 21 Aug 2026 21:36:28 +0100
Subject: [PATCH] Decrease memory footprint of storing blocks.

---
 include/internal/syntax/decl.h | 6 +++---
 src/internal/syntax/parser.cc  | 8 ++++----
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/internal/syntax/decl.h b/include/internal/syntax/decl.h
index 654ea9f..a6e542c 100644
--- a/include/internal/syntax/decl.h
+++ b/include/internal/syntax/decl.h
@@ -121,9 +121,9 @@ struct ParseStateLeaf : ParseState {
   void *state;
   uint32_t n;
   uint32_t cap;
-  uint32_t *blocks;
-  static constexpr uint32_t IS_CLOSING = 1ull << 31;
-  static constexpr uint32_t LINE_MASK = ~IS_CLOSING;
+  uint16_t *blocks;
+  static constexpr uint16_t IS_CLOSING = 0x8000;
+  static constexpr uint16_t LINE_MASK = 0x7fff;
 };
 
 struct TreeCursor {
diff --git a/src/internal/syntax/parser.cc b/src/internal/syntax/parser.cc
index 16aae73..76382d9 100644
--- a/src/internal/syntax/parser.cc
+++ b/src/internal/syntax/parser.cc
@@ -248,10 +248,10 @@ void Parser::modify(vase::Vase &vase, uint64_t target, uint64_t count) {
         continue;
       if (c.leaf->n == c.leaf->cap) {
         uint32_t cap = c.leaf->cap ? c.leaf->cap * 2 : 8;
-        c.leaf->blocks = (uint32_t *)realloc(c.leaf->blocks, cap * sizeof(uint32_t));
+        c.leaf->blocks = (uint16_t *)realloc(c.leaf->blocks, cap * sizeof(uint16_t));
         c.leaf->cap = cap;
       }
-      c.leaf->blocks[c.leaf->n++] = t << 31 | (at - chunk_start);
+      c.leaf->blocks[c.leaf->n++] = t << 15 | (at - chunk_start);
     }
     at++;
   }
@@ -269,7 +269,7 @@ uint64_t Parser::next_closing(uint64_t line) {
   while (c.leaf) {
     auto *leaf = c.leaf;
     for (uint32_t i = 0; i < leaf->n; ++i) {
-      uint32_t block = leaf->blocks[i];
+      uint16_t block = leaf->blocks[i];
       uint32_t pos = block & ParseStateLeaf::LINE_MASK;
       if (first_leaf && pos <= relative)
         continue;
@@ -300,7 +300,7 @@ uint64_t Parser::prev_opening(uint64_t line) {
   while (c.leaf) {
     auto *leaf = c.leaf;
     for (int32_t i = (int32_t)leaf->n - 1; i >= 0; --i) {
-      uint32_t block = leaf->blocks[i];
+      uint16_t block = leaf->blocks[i];
       uint32_t pos = block & ParseStateLeaf::LINE_MASK;
       if (first_leaf && pos >= relative)
         continue;