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--- sd:runtime_library_notes [2026/06/11 02:59] – created appledog
+++ sd:runtime_library_notes [2026/06/16 02:51] (current) – appledog
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 == Prep Work
-Helper scripts were created this time: ''c2sda'', ''c2ll'', ''ll2sda'' and ''runtests''.
+* Helper scripts were created this time: ''c2sda'', ''c2ll'', ''ll2sda'' and ''runtests''.
+* Next I had to modify VC-4 to take .sda files at the command line (to speed the dev cycle).
+* Next I created the above directory.
+* I will have to modify vc4 to look in ~/.vc4 if the files it needs are not in the pwd.
+== Fleshing it out
+Many standard implementations reveal deficiencies in instrinfo and iseltargetlowering.
+== Test Suite
+I collected all the tests into one file.
+== Roadmap
+* putchar.sda (the only assembly only file so far -- similar to tinyc v1)
+* print_str
+* print_dec
+* lib1 (stuff for missing instructions)
+* libctype
+* libstr
+* libstdlib
+then
+* stdint.h, limits.h, stddef.h, stdbool.h
+* stdalign/stdnoreturn/iso646
+* finish string.h (memchr, strncat, strpbrk, strspn, strcspn, strtok)
+* safe-string extras (strlcpy/strlcat, strcasecmp/strncasecmp, memmem),
+* div/ldiv, rand/srand, qsort/bsearch, assert.h
+* official puts/getchar.
+Roadmap which requires additional development:
+* malloc/free/calloc/realloc
+* then strdup/strndup
+Phase III
+* stdarg.h for varargs and formatted output. very high value target (enables printf)
+* printf/sprintf/snprintf/vsnprintf and sscanf.
+Later:
+* compiler-facing primitives LEA, MOVSX, CMOV, get CASETAB to emit.
+* 64-bit integers. __muldi3, __udivdi3/__umoddi3, __divdi3/__moddi3.
+Floating Point Roadmap:
+* Start writing math.h and see what happens.
+* strtod/atof, %f for printf.
+File IO Roadmap:
+* fopen/fread/fwrite/fseek/fclose and FILE* streams wrapping *(see INT 15h/OPFS/FCB)
+Other:
+* time.h, calendar math, binding time() to the hardware clock
+* Graphics and Sound libraries
+* access to PPU and ASU
+== Arena Allocator
+"A growable, chunked, monotonic region allocator."
+This is very similar to the NVAR system I wrote for BASIC. Hanson uses "arena" in C Interfaces and Implementations; the academic literature says "region". "Bump allocator" is the name of the mechanism, advancing a pointer within a chunk, but the whole structure, with chunked growth and free-everything-at-once teardown, is the arena.