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* c: fix diagnostic with "return <undeclared>" lemon2025-12-311-2/+2
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* backend: separate instrs for integer/float store lemon2025-12-311-5/+5
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* c: SYM expr should store decl ref as an index, not pointer lemon2025-12-303-52/+59
| | | | | | | | Because envdecls (now declsbuf) can be resized and invalidate those pointers. I missed this because the default initialization size of that buffer (and the fact that it would mostly only manifest with function-local expressions) made it not really come up in practice. Silly
* cpp: nicer handling of predefined macros lemon2025-12-291-40/+29
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* backend: start implementing aarch64 lemon2025-12-281-0/+4
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* avoid GOT relocations in unnecessary instances lemon2025-12-251-1/+1
| | | | | Also change xcon to have a flagset for symbols (whether it's a function, locally defined; later: thread local, etc).
* c: add _Generic lemon2025-12-221-0/+53
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* c: recognize __attribute__ as decltok, improve diagnostic for expected ↵ lemon2025-12-221-1/+2
| | | | declaration
* preprocessor make some errors just warnings lemon2025-12-221-4/+6
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* c/c.c: cleanup exprparse a little lemon2025-12-221-13/+12
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* c: Fix some dumb uses of initialized stuff lemon2025-12-222-10/+12
| | | | | | Can't figure out what's wrong with the change to struct expr from 9721d6ba40 but it makes valgrind complain and causes miscompilation of the compiler itself..
* c: keyword aliases lemon2025-12-213-66/+81
| | | | | Some linux headers use __signed__ for whatever reason.. this is a general fix for those alternate keyword
* c: allow `return voidfn()` extension lemon2025-12-211-4/+30
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* lexer: more small optimizations lemon2025-12-211-14/+33
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* lexer: note source of #include when error occurs in #included file lemon2025-12-202-1/+8
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* c: small typechecking bugfixes lemon2025-12-201-3/+3
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* some static assertions for packed type sizes lemon2025-12-201-6/+8
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* backend: unify pass memory allocation strategies lemon2025-12-201-1/+1
| | | | | | It was all over the place for temporary data structures used by individual passes. Now there is an arena specifically for that, which is nicer.
* c: support CRLF newlines lemon2025-12-201-3/+11
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* c: fix a silly C edge case with function redeclaration storage class lemon2025-12-201-14/+21
| | | | | | C (or at least clang and gcc) allows declaring `static int f(...);` and defining it later as `int f(...) {...}`, omitting the 'static' in the latter definition.
* lexer: fix remnant use of TKEOF for character lemon2025-12-201-9/+7
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* optimize lexer a bit more lemon2025-12-202-62/+88
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* lexer: convert pp-idents to keywords only after preprocessing lemon2025-12-202-71/+75
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* c: factor out to tldecl(), improve error recovery, lemon2025-12-201-73/+97
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* c.h init zero bitset portability lemon2025-12-191-1/+1
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* c: support 0-length arrays as syntax for flexible array members lemon2025-12-191-19/+29
| | | | | Keeping the expr around in the decllist paves the way for VLA support later on
* c: fix incr/decr codegen for floats lemon2025-12-191-2/+2
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* c: hack to support __FUNCTION__ GNU extension lemon2025-12-191-4/+10
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* cpp: GNU extension for named variadic arguments lemon2025-12-181-4/+7
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* cpp: better error recovery for #define syntax error lemon2025-12-181-6/+7
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* c: fix uninitiliazed field in decltypes lemon2025-12-171-0/+1
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* nicer defaults and facilities for cross-compilation lemon2025-12-171-2/+16
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* c: improve some type error diagnostics lemon2025-12-151-13/+22
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* create distinct interned string type lemon2025-12-154-75/+76
| | | | | | | | | | | | | | Interned strings are used pervasively, so it's a good idea to add a layer of type safety to differentiate them from general cstrs and avoid potential bugs from comparing non-interned and interned strings. Not that that's happened so far that I can remember, but it could. I'm 90% sure it's legal to alias `struct {char c;}` pointers with `char` pointers. This specific typedef gives type safety but with a simple one-way `internstr -> const char *` typecast (with `&istr->c`). Converting the other way around is more intentional: a straight up cast `(internstr)cstr` which sticks out as unchecked and probably wrong, or calling the intern(cstr) function, which is the right way.
* move intern() to mem.c lemon2025-12-153-47/+0
| | | | | Being in lex.c was vestigial, since it was being used all over the frontend and backend.
* lex: loop with goto instead of tail recursion lemon2025-12-151-7/+8
| | | | | This uncovered a edgecase with loops and lifetime construction in regalloc!
* lexer: use a hashmap to lookup keywords lemon2025-12-152-28/+28
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* c: error when defining function with incomplete parameter type lemon2025-12-151-0/+4
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* c: support forward-declared enums lemon2025-12-151-34/+32
| | | | This is a common non-standard GNU extension.
* c: emit data for __func__ lazily lemon2025-12-151-15/+16
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* c: fix another memory-leak-when-errors case lemon2025-12-141-1/+2
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* c: as a hack, warn for zero-length array instead of error lemon2025-12-141-1/+1
| | | | | Treated as unsized array T[]. This shows up in some linux headers as a non-standard way to have flexible array members.
* c/builtin: fix vacopy lemon2025-12-141-5/+6
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* c: fix memory leak if initializer data if error lemon2025-12-141-1/+1
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* eval: long double placeholder lemon2025-12-141-1/+2
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* cpp: support #line directives lemon2025-12-141-10/+75
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* cpp: correctly handle extra tokens after directives lemon2025-12-141-16/+21
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* only put dats can in .text now when emitting it lemon2025-12-141-2/+2
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* various relocation related optimization lemon2025-12-141-3/+3
| | | | | | | | | | With 59ca5a8db, querying if a symbol is defined is cheap. If we're compiling code that calls foo() and we defined foo() in this compilation unit, we already know its offset within the .text section, so use it instead of emitting a relocation for the linker to handle. Also, put small literal data in the .text section instead of .rodata. This seems to improve performance (cache locality?), and as a bonus, it will be good for aarch64's instr encoding with smallish PC-relative offsets.
* c: handle more static eval edgecases for int -> ptr lemon2025-12-132-5/+20
| | | | | sqlite3 was falling back to `((void*)&((char*)0)[X])` for INT_TO_PTR, which this handles now.
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