SYNOPSIS

  chibicc.com [FLAGS] INPUTS

DESCRIPTION

  chibicc - A Small GNU-Style ISO/IEC 9899:2011 Standard Compiler

OVERVIEW

  chibicc is the simplest/tiniest/hackable/readable c11 compiler in the
  world that can compile code quickly and consistently across platforms

FLAGS

  -o PATH

      Specifies path of output.

  -c

      Objectify the source file, but do not link.

  -S

      Compile the source file, but do not objectify.

  -E

      Preprocess the source file, but do not compile.
      Output defaults to stdout.

  -D TOKEN[=VALUE]

      Defines preprocessor token.

  -U TOKEN

      Undefines preprocessor token.

  -include DIR

     Add include.

  -I DIR
  -iquote DIR
  -isystem DIR

      Adds include directory.

  -x c                    (default for .c files)
  -x assembler            (default for .s files)
  -x assembler-with-cpp   (default for .S files)

      Explicitly specifies programming language.

  -Wa arg1[,arg2...]
  -Xassembler arg1[,arg2...]

      Appends opaque arguments passed along to assembler.

  -Wl arg1[,arg2...]
  -Xlinker arg1[,arg2...]

      Appends opaque arguments passed along to linker.

  -v

      Enables verbose mode.
      Lines with subprocess commands start with a space.

  -###

      Implies -v and enables shell command argument quoting.

  --version

      Shows compiler version.

  --help

      Shows this information.


CODEGEN

  -pg
  -mfentry
  -mnop-mcount
  -mrecord-mcount

      Controls output of profiling hooks in function prologues.

  -fdata-sections
  -ffunction-sections

      Controls granularity of code visible to the linker.

  -msse3
  -msse4
  -msse4.1
  -msse4.2
  -mpopcnt

      Specifies microarchitectural features. Default is K8.

  -fpie
  -fpic
  -fPIC

      Controls output of position independent code.

  -fcommon
  -fno-common

      Controls usage of traditional STT_COMMON objects.


MAKEFILE

  -M

      Generate makefile header dependency code.
      Output defaults to stdout.

  -MD

      Generate makefile header dependency code, and compile.
      Output defaults to output path with .d extension.

  -MMD

      Generate makefile header dependency code, and compile.
      Default include roots are excluded as dependencies.
      Output defaults to output path with .d extension.

  -MF PATH

      Specifies output path of header dependency code.

  -MT NAME

      Specifies name of target in generated makefile code.

  -MQ NAME

      Specifies name of target in makefile code w/ quoting.


INTERNALS

  -P

      Generate Python bindings.

  -A

      Print abstract syntax tree.

  -J

      Generate HTML documentation for public APIs based on Javadoc
      comments containing Markdown.


INTEGRAL TYPES

  _Bool
  char
  short
  int
  long
  long long
  __int128
  signed char
  unsigned char
  unsigned short
  unsigned int
  unsigned long
  unsigned long long
  unsigned __int128

FLOATING POINT TYPES

  float
  double
  long double


BUILTIN FUNCTIONS

  T              __builtin_expect(T, int)
  unsigned long  __builtin_offsetof(typename, token)
  int            __builtin_reg_class(typename)
  num            __builtin_constant_p(expr)
  int            __builtin_unreachable()
  void *         __builtin_frame_address(int)
  _Bool          __builtin_types_compatible_p(typename, typename)
  T              __builtin_atomic_exchange(T *addr, T neu)
  T *            __builtin_assume_aligned(T *addr)
  _Bool          __builtin_add_overflow(T, T, T *)
  _Bool          __builtin_sub_overflow(T, T, T *)
  _Bool          __builtin_mul_overflow(T, T, T *)
  _Bool          __builtin_neg_overflow(T, T, T *)
  void *         __builtin_alloca(unsigned long)
  void           __builtin_trap()
  int            __builtin_clz(int)
  int            __builtin_clzl(long)
  int            __builtin_clzll(long long)
  int            __builtin_ctz(int)
  int            __builtin_ctzl(long)
  int            __builtin_ctzll(long long)
  int            __builtin_ffs(int)
  int            __builtin_ffsl(long)
  int            __builtin_ffsll(long long)
  int            __builtin_popcount(unsigned int)
  long           __builtin_popcountl(unsigned long)
  long           __builtin_popcountll(unsigned long)
  unsigned long  __builtin_strlen(char *)
  char *         __builtin_strstr(char *, char *)
  char *         __builtin_strchr(char *, int)
  void *         __builtin_memcpy(void *, void *, unsigned long)
  char *         __builtin_strpbrk(char *, char *)
  unsigned short __builtin_bswap16(unsigned short)
  unsigned int   __builtin_bswap32(unsigned int)
  unsigned long  __builtin_bswap64(unsigned long)
  int            __builtin_isnan(flonum)
  int            __builtin_isinf(flonum)
  int            __builtin_isfinite(flonum)
  int            __builtin_fpclassify(flonum)
  int            __builtin_isless(flonum, flonum)
  int            __builtin_isgreater(flonum, flonum)
  int            __builtin_isunordered(flonum, flonum)
  int            __builtin_islessequal(flonum, flonum)
  int            __builtin_islessgreater(flonum, flonum)
  int            __builtin_isgreaterequal(flonum, flonum)
  double         __builtin_nan(char *)
  float          __builtin_nanf(char *)
  long double    __builtin_nanl(char *)
  long           __builtin_signbit(double)
  int            __builtin_signbitf(float)
  int            __builtin_signbitl(long double)
  double         __builtin_huge_val()
  float          __builtin_huge_valf()
  long double    __builtin_huge_vall()
  double         __builtin_fabs(double)
  float          __builtin_fabsf(float)
  long double    __builtin_fabsl(long double)
  double         __builtin_logb(double)
  float          __builtin_logbf(float)
  long double    __builtin_logbl(long double)
  double         __builtin_fmax(double, double)
  float          __builtin_fmaxf(float, float)
  long double    __builtin_fmaxl(long double, long double)
  double         __builtin_fmin(double, double)
  float          __builtin_fminf(float, float)
  long double    __builtin_fminl(long double, long double)
  double         __builtin_copysign(double, double)
  float          __builtin_copysignf(float, float)
  long double    __builtin_copysignl(long double, long double)
  void           __builtin_ia32_movntq(di *, di)
  int            __builtin_ia32_pmovmskb128(v16qi)
  T              __atomic_load_n(T *addr, int memorder)
  void           __atomic_load(T *addr, T *res, int memorder)
  void           __atomic_store_n(T *addr, T val, int memorder)
  void           __atomic_store(T *addr, T *val, int memorder)
  void           __atomic_clear(_Bool *addr, int memorder)
  _Bool          __atomic_test_and_set(void *addr, int memorder)
  T              __atomic_fetch_add(T *addr, T amt, int memorder)
  T              __atomic_fetch_sub(T *addr, T amt, int memorder)
  T              __atomic_fetch_xor(T *addr, T amt, int memorder)
  T              __atomic_fetch_and(T *addr, T amt, int memorder)
  T              __atomic_fetch_or(T *addr, T amt, int memorder)
  _Bool          __atomic_compare_exchange_n(T *addr, T *old, T neu, int weak, int goodorder, int failorder)
  T              __sync_lock_test_and_set(T *addr, T value, ...)
  void           __sync_lock_release(T *addr, ...)


BUILTIN OBJECTS

  __func__
  __FUNCTION__
  __va_area__
  __alloca_size__

BUILTIN MACROS

  __FILE__
  __LINE__
  __DATE__
  __TIME__
  __COUNTER__
  __TIMESTAMP__
  __BASE_FILE__
  __chibicc__
  __cosmopolitan__
  __GNUC__
  __GNUC_MINOR__
  __GNUC_PATCHLEVEL__
  __NO_INLINE__
  __GNUC_STDC_INLINE__
  __BIGGEST_ALIGNMENT__
  __C99_MACRO_WITH_VA_ARGS
  __GCC_ASM_FLAG_OUTPUTS__
  __ELF__
  __LP64__
  _LP64
  __STDC__
  __STDC_HOSTED__
  __STDC_NO_COMPLEX__
  __STDC_UTF_16__
  __STDC_UTF_32__
  __STDC_VERSION__
  __USER_LABEL_PREFIX__
  __alignof__
  __const__
  __inline__
  __signed__
  __typeof__
  __volatile__
  __unix
  __unix__
  __linux
  __linux__
  __gnu_linux__
  __BYTE_ORDER__
  __FLOAT_WORD_ORDER__
  __ORDER_BIG_ENDIAN__
  __ORDER_LITTLE_ENDIAN__
  __INT8_MAX__
  __UINT8_MAX__
  __INT16_MAX__
  __UINT16_MAX__
  __SHRT_MAX__
  __INT_MAX__
  __INT32_MAX__
  __UINT32_MAX__
  __INT64_MAX__
  __LONG_MAX__
  __LONG_LONG_MAX__
  __UINT64_MAX__
  __SIZE_MAX__
  __INTPTR_MAX__
  __UINTPTR_MAX__
  __WINT_MAX__
  __CHAR_BIT__
  __SIZEOF_SHORT__
  __SIZEOF_INT__
  __SIZEOF_LONG__
  __SIZEOF_LONG_LONG__
  __SIZEOF_POINTER__
  __SIZEOF_PTRDIFF_T__
  __SIZEOF_SIZE_T__
  __SIZEOF_WCHAR_T__
  __SIZEOF_WINT_T__
  __SIZEOF_FLOAT__
  __SIZEOF_FLOAT128__
  __SIZEOF_DOUBLE__
  __SIZEOF_FLOAT80__
  __SIZEOF_LONG_DOUBLE__
  __INT8_TYPE__
  __UINT8_TYPE__
  __INT16_TYPE__
  __UINT16_TYPE__
  __INT32_TYPE__
  __UINT32_TYPE__
  __INT64_TYPE__
  __UINT64_TYPE__
  __INTPTR_TYPE__
  __UINTPTR_TYPE__
  __PTRDIFF_TYPE__
  __SIZE_TYPE__
  __WCHAR_TYPE__
  __CHAR16_TYPE__
  __CHAR32_TYPE__
  __WINT_TYPE__
  __CHAR16_TYPE__
  __WCHAR_TYPE__
  __CHAR32_TYPE__
  __INT_LEAST8_TYPE__
  __UINT_LEAST8_TYPE__
  __INT_LEAST16_TYPE__
  __UINT_LEAST16_TYPE__
  __INT_LEAST32_TYPE__
  __UINT_LEAST32_TYPE__
  __INT_LEAST64_TYPE__
  __UINT_LEAST64_TYPE__
  __INT_FAST8_TYPE__
  __UINT_FAST8_TYPE__
  __INT_FAST16_TYPE__
  __UINT_FAST16_TYPE__
  __INT_FAST32_TYPE__
  __UINT_FAST32_TYPE__
  __INT_FAST64_TYPE__
  __UINT_FAST64_TYPE__
  __DBL_DECIMAL_DIG__
  __DBL_DENORM_MIN__
  __DBL_DIG__
  __DBL_EPSILON__
  __DBL_HAS_DENORM__
  __DBL_HAS_INFINITY__
  __DBL_HAS_QUIET_NAN__
  __DBL_MANT_DIG__
  __DBL_MAX_10_EXP__
  __DBL_MAX_EXP__
  __DBL_MAX__
  __DBL_MIN_10_EXP__
  __DBL_MIN_EXP__
  __DBL_MIN__
  __FLT_DECIMAL_DIG__
  __FLT_DENORM_MIN__
  __FLT_DIG__
  __FLT_EPSILON__
  __FLT_EVAL_METHOD_TS_18661_3__
  __FLT_EVAL_METHOD__
  __FLT_HAS_DENORM__
  __FLT_HAS_INFINITY__
  __FLT_HAS_QUIET_NAN__
  __FLT_MANT_DIG__
  __FLT_MAX_10_EXP__
  __FLT_MAX_EXP__
  __FLT_MAX__
  __FLT_MIN_10_EXP__
  __FLT_MIN_EXP__
  __FLT_MIN__
  __FLT_RADIX__
  __LDBL_DECIMAL_DIG__
  __LDBL_DENORM_MIN__
  __LDBL_DIG__
  __LDBL_EPSILON__
  __LDBL_HAS_DENORM__
  __LDBL_HAS_INFINITY__
  __LDBL_HAS_QUIET_NAN__
  __LDBL_MANT_DIG__
  __LDBL_MAX_10_EXP__
  __LDBL_MAX_EXP__
  __LDBL_MAX__
  __LDBL_MIN_10_EXP__
  __LDBL_MIN_EXP__
  __LDBL_MIN__
  __x86_64
  __x86_64__
  __amd64
  __amd64__
  __MMX__
  __SSE__
  __SSE_MATH__
  __SSE2__
  __SSE2_MATH__
  __SSE3__                        [conditional]
  __SSE4__                        [conditional]
  __POPCNT__                      [conditional]
  __PG__                          [conditional]
  __PIC__                         [conditional]
  __MFENTRY__                     [conditional]


ASSEMBLER

  That process is normally an implementation detail of your compiler,
  which can embed this program or launch it as a subprocess. Much GNU
  style syntax is supported. Your code that gets embedded in an asm()
  statement will ultimately end up here. This implementation, has the
  advantage of behaving the same across platforms, in a simple single
  file implementation that compiles down to a 100kilo ape executable.

  Your assembler supports the following flags:

    -o FILE                       output path [default: a.out]
    -I DIR                        append include path [default: .]
    -W                            inhibit .warning
    -Z                            inhibit .error and .err

  Your assembler supports the following directives:

    .zero N                       emits 0's
    .byte INT...                  emits int8
    .word INT...                  emits int16
    .long INT...                  emits int32
    .quad INT...                  emits int64
    .octa INT...                  emits int128
    .ascii STR...                 emits string
    .asciz STR...                 emits string and 0 byte
    .ident STR                    emits string to .comment section
    .float NUMBER...              emits binary32
    .double NUMBER...             emits binary64
    .float80 NUMBER...            emits x86 float (10 bytes)
    .ldbl NUMBER...               emits x86 float (16 bytes)
    .zleb128 NUMBER...            emits LEB-128 zigzag varint
    .sleb128 NUMBER...            emits LEB-128 signed varint
    .uleb128 NUMBER...            emits LEB-128 unsigned varint
    .align BYTES [FILL [MAXSKIP]] emits fill bytes to boundary
    .end                          halts tokenization
    .abort                        crashes assembler
    .err                          aborts (ignorable w/ -Z)
    .error STR                    aborts (ignorable w/ -Z)
    .warning STR                  whines (ignorable w/ -W)
    .text                         enters text section (default)
    .data                         enters data section
    .bss                          enters bss section
    .section NAME [SFLG SHT]      enters section
    .previous                     enters previous section
    .pushsection NAME [SFLG SHT]  pushes section
    .popsection                   pops section
    .type SYM TYPE                sets type of symbol
    .size SYM EXPR                sets size of symbol
    .internal SYM...              marks symbol STV_INTERNAL
    .hidden SYM...                marks symbol STV_HIDDEN
    .protected SYM...             marks symbol STV_PROTECTED
    .globl SYM...                 marks symbol STB_GLOBAL
    .local SYM...                 marks symbol STB_LOCAL
    .weak SYM...                  marks symbol STB_WEAK
    .include FILE                 assembles file source
    .incbin FILE                  emits file content
    .file FILENO PATH             dwarf file define
    .loc FILENO LINENO            dwarf source line

  TYPE can be one of the following:

    - @notype                     STT_NOTYPE (default)
    - @object                     STT_OBJECT
    - @function                   STT_FUNC
    - @common                     STT_COMMON
    - @tls_object                 STT_TLS

  SHT can be one of the following:

    - @progbits                   SHT_PROGBITS
    - @note                       SHT_NOTE
    - @nobits                     SHT_NOBITS
    - @preinit_array              SHT_PREINIT_ARRAY
    - @init_array                 SHT_INIT_ARRAY
    - @fini_array                 SHT_FINI_ARRAY

  SFLG is a string which may have the following characters:

    - a                           SHF_ALLOC
    - w                           SHF_WRITE
    - x                           SHF_EXECINSTR
    - g                           SHF_GROUP
    - M                           SHF_MERGE
    - S                           SHF_STRINGS
    - T                           SHF_TLS

  PREFIXES

    addr32   cs     data16  ds     es      fs
    gs       lock   rep     repe   repne   repnz
    repz     rex    rex.b   rex.r  rex.rb  rex.rx
    rex.rxb  rex.w  rex.wb  rex.wr rex.wrb rex.wrx
    rex.wrxb rex.wx rex.wxb rex.x  rex.xb  ss

  REGISTERS

    64-bit  32-bit  16-bit  lo byte hi byte │ sse     mmx     │ fpu
    ─────── ─────── ─────── ─────── ─────── │ ─────── ─────── │ ───────
    %rax    %eax    %ax     %al     %ah     │ %xmm0   %mm0    │ %st(0)
    %rcx    %ecx    %cx     %cl     %ch     │ %xmm1   %mm1    │ %st(1)
    %rdx    %edx    %dx     %dl     %dh     │ %xmm2   %mm2    │ %st(2)
    %rbx    %ebx    %bx     %bl     %bh     │ %xmm3   %mm3    │ %st(3)
    %rsp    %esp    %sp     %spl            │ %xmm4   %mm4    │ %st(4)
    %rbp    %ebp    %bp     %bpl            │ %xmm5   %mm5    │ %st(5)
    %rsi    %esi    %si     %sil            │ %xmm6   %mm6    │ %st(6)
    %rdi    %edi    %di     %dil            │ %xmm7   %mm7    │ %st(7)
    %r8     %r8d    %r8w    %r8b            │ %xmm8
    %r9     %r9d    %r9w    %r9b            │ %xmm9
    %r10    %r10d   %r10w   %r10b           │ %xmm10
    %r11    %r11d   %r11w   %r11b           │ %xmm11
    %r12    %r12d   %r12w   %r12b           │ %xmm12
    %r13    %r13d   %r13w   %r13b           │ %xmm13
    %r14    %r14d   %r14w   %r14b           │ %xmm14
    %r15    %r15d   %r15w   %r15b           │ %xmm15
    %riz    %eiz


RICHARD STALLMAN MATH55 ASM() NOTATION

  BEHAVIOR

    =: write-only
    +: read/writeable

  SELECTION

    Autonomous

      a: ax/eax/rax
      b: bx/ebx/rbx
      c: bx/ebx/rbx
      d: dx/edx/rdx
      S: si/esi/rsi
      D: di/edi/rdi

    Algorithmic

      r:  pick one of a,b,c,d,D,S,bp,sp,r8-15 registers, referenced as %0,etc.
      l:  pick one of a,b,c,d,D,S,bp,r8-15 for indexing, referenced as %0,etc.
      q:  pick one of a,b,c,d,r8-r15 for lo-byte access, e.g. %b0,%w0,%k0,etc.
      Q:  pick one of a,b,c,d for hi-byte access, e.g. %h0,etc.
      U:  pick one of a,c,d,D,S,r8-11 (call-clobbered)
      R:  pick one of a,b,c,d,D,S,bp,sp (all models)
      y:  pick mmx register
      x:  pick sse register
      X:  pick anything
      m:  memory
      o:  memory offsetable by an immediate, referenced as %0,2+%0,etc.
      p:  memory, intended for load/push address and segments (movl %@:%p1, %0)
      g:  probably shorthand for "rmi" combo
      X:  allow anything

    Combos

       rm: pick register or memory address (converting immediates)
      rmi: pick register or memory address (allowing immediates)

    Immediates

      i: integer literal or compiler/assembler constexpr or linker embedding
      e: i∊[-2^31,2^31) for sign-extending immediates
      Z: i∊[0,2^32) for zero-extending immediates
      I: i∊[0,31] (5 bits for 32-bit shifts)
      J: i∊[0,63] (6 bits for 64-bit shifts)
      K: i∊[-128,127]
      L: permit uncasted char/short literal as zero-extended operand to andl?
      M: i∊[0,3] (intended for index scaling, e.g. "mov\t(?,?,1<<%0),?")
      N: i∊[0,255] (for in & out)
      M: 2-bit integer constant (shifts for index scaling)
      I: 5-bit integer constant (for 32-bit shifts)
      J: 6-bit integer constant (for 64-bit shifts)

    Transcendentals

       f: any stack slot
       t: top of stack (%st(0)) and possibly converts xmm to ymm
       u: second top of stack (%st(1))

    Specials

      %=     generates number unique to each instance
      %%REG  explicitly-supplied register (used w/ clobbers)

  AUGMENTATION

    %pN    print raw
    %PN    print w/ @plt
    %aN    print address
    %zN    print only opcode suffix for operand type
    %lN    print label without punctuation, e.g. jumps
    %cN    print immediate w/o punctuation, e.g. lea %c0(%1),%2
    %bN    print lo-byte form, e.g. xchgb %b0,%%al (QImode 8-bit)
    %hN    print hi-byte form, e.g. xchgb %h0,%%ah (QImode 8-bit)
    %wN    print word form, e.g. xchgw %w0,%%ax (HImode 16-bit)
    %kN    print dword form, e.g. xchgl %k0,%%eax (SImode 32-bit)
    %qN    print qword form, e.g. xchgq %q0,%%rax (DImode 64-bit)
    %HN    access high 8 bytes of SSE register, or +8 displacement
    %nN    negated literal, e.g. lea %n0(%1),%2
    %VN    print register name without %, e.g. call foo%V0

  EXAMPLE

    static inline void MixAudio(short a[static 8], const short b[static 8]) {
      asm("paddsw\t%1,%0"
          : "+x"(a)
          : "x"(b)
          : "memory");
    }
