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Simple C compiler
This also adds support for integer character constants containing more than one character, e.g. 'ab'. With this we should be able to use wide characters and wide string literals, e.g. L'a' and L"abc". This introduces wchar_t, WCHAR_MIN, WCHAR_MAX in the appropriate existing headers (<stddef.h>, <stdlib.h>, <stdint.h>), but does not add new related headers (<wchar.h>, <wctype.h>) or any other wide char functionality. The compiler (both smlrcc and smlrc) receives additional options to control the type underlying wchar_t: UCS-2/UTF-16: -short-wchar -unsigned-wchar UCS-4/UTF-32: -long-wchar -signed-wchar (or -long-wchar -unsigned-wchar if desired) UCS-4/UTF-32 is the default for ELF/Linux and Mach-O/MacOS executables. UCS-2/UTF-16 is the default for DOS, PE/Windows and flat executables. As usual, 32-bit wchar_t is only available in 32-bit mode(l)s (that is, not in tiny, small or 16-bit flat mode(l)s). Wide characters and wide string literals are limited to ASCII chars inside the single and double quotation marks because Smaller C parses source code as 8-bit chars and doesn't know how to interpret non-ASCII chars with codes 0x80 through 0xFF without properly supporting locales, code pages and the like. Smaller C does not support UTF-8 with BOM either. For non-ASCII characters use their Unicode codes like so: L"na\xEFve" // 0xEF = Latin small letter I with diaeresis L"fianc\xE9"L"e" // 0xE9 = Latin small letter E with acute Note that in the last example we break the string literal into parts in order to stop the hex sequence after two hex digits, \xE9. Without that \xE9e would be interpreted as a hex sequence for Lao letter Pho Tam. Also note that string literal concatenation works only for literals of the same type, e.g. "ab" followed by "cd" (or L"ab" followed by L"cd"). Mixing and matching wide and non- wide literals is not supported, e.g. the following won't compile: "ab" L"cd" (or L"ab" "cd").
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Aug 16, 2018
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Smaller C is a simple and small single-pass C compiler, currently supporting most of the C language common between C89/ANSI C and C99 (minus some C89 and plus some C99 features). Currently it generates 16-bit and 32-bit 80386+ assembly code for NASM that can then be assembled and linked into DOS, Windows, Linux and Mac OS X programs. (You may use YASM or FASM instead of NASM) Code generation for MIPS CPUs is also supported (primarily for RetroBSD). Code generation for the TR3200 CPU and VASM is supported (see Trillek). The compiler is capable of compiling itself. The core compiler comes with a preprocessor (ucpp), a linker and a compiler driver (the driver invokes the preprocessor, the core compiler, the assembler, and the linker and supports options similar to those of gcc). The standard C library is work-in-progress and it's close to completion. See the project documentation for more up-to-date details: https://github.com/alexfru/SmallerC/tree/master/v0100/doc For the lack of a better place, you can discuss Smaller C here: https://hackaday.io/project/5569-smaller-c Links: NASM: http://nasm.us/ YASM: http://yasm.tortall.net/ FASM: http://flatassembler.net/ CWSDPMI: https://sandmann.dotster.com/cwsdpmi/ HX DOS Extender: https://web.archive.org/web/20141003032346/http://www.japheth.de/ RetroBSD: http://retrobsd.org/ VASM: http://sun.hasenbraten.de/vasm/ Trillek: http://trillek.org/ Other projects based on/using Smaller C: "ROM C" (like ROM Basic but C): https://hackaday.io/project/29198-native-c-pic32-color-video-on-tv FYS OS: http://www.fysnet.net/fysos.htm NewBasic Compiler: http://fysnet.net/nbc.htm Sweet32 CPU and toolchain: https://github.com/Basman74/Sweet32-CPU Normative and other useful documents on C: C99 + TC1 + TC2 + TC3, WG14 N1256: http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf Dave Prosser's C preprocessing algorithm annotated by Diomidis D. Spinellis: http://www.spinellis.gr/blog/20060626/index.html Rationale for C99: http://www.open-std.org/jtc1/sc22/wg14/www/docs/C99RationaleV5.10.pdf The New C Standard: An Economic and Cultural Commentary: http://www.knosof.co.uk/cbook/cbook.html The Development of the C Language by Dennis M. Ritchie: https://www.bell-labs.com/usr/dmr/www/chist.html