higher-order defun

2026-07-12 20:58:10 -06:00
parent 4522e455dd
commit 269d956566
8 changed files with 194 additions and 46 deletions
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+#+title: representation of Scheme types
+
+the Scheme unitype is encoded as ~(ref eq)~ with immediates in ~(ref i31)~ and heap objects in ~$heap-object~:
+#+begin_src wat
+  (type $heap-object (sub (struct (field $hash (mut i32)))))
+#+end_src
+
+* immediates
+
+all immediates are stored in ~(ref i31)~ and thus must fit in 31 bits. the most important immediate, the integer, is indicated by a null low bit.
+#+begin_example
+XXXX XXXX XXXX XXXX XXXX XXXX XXXX XX00
+                                     || 
+                                     |\ used by wasm's i31 rep
+      zero indicates a 30-bit fixnum /
+      in the upper bits
+#+end_example