gmqcc/gmqcc.h

/*
 * Copyright (C) 2012
 *     Dale Weiler, Wolfgang Bumiller
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#ifndef GMQCC_HDR
#define GMQCC_HDR
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>


#define GMQCC_VERSION_MAJOR 0
#define GMQCC_VERSION_MINOR 1
#define GMQCC_VERSION_PATCH 0
#define GMQCC_VERSION_BUILD(J,N,P) (((J)<<16)|((N)<<8)|(P))
#define GMQCC_VERSION \
    GMQCC_VERSION_BUILD(GMQCC_VERSION_MAJOR, GMQCC_VERSION_MINOR, GMQCC_VERSION_PATCH)

/*
 * We cannoy rely on C99 at all, since compilers like MSVC
 * simply don't support it.  We define our own boolean type
 * as a result (since we cannot include <stdbool.h>). For
 * compilers that are in 1999 mode (C99 compliant) we can use
 * the language keyword _Bool which can allow for better code
 * on GCC and GCC-like compilers, opposed to `int`.
 */
#ifndef __cplusplus
#   ifdef  false
#       undef  false
#   endif /* !false */
#   ifdef  true
#       undef true
#   endif /* !true  */
#   define false (0)
#   define true  (1)
#   define bool _Bool
#   if __STDC_VERSION__ < 199901L && __GNUC__ < 3
        typedef int  _Bool
#   endif
#   endif /* !__cplusplus */

/*
 * Of some functions which are generated we want to make sure
 * that the result isn't ignored. To find such function calls,
 * we use this macro.
 */
#if defined(__GNUC__) || defined(__CLANG__)
#   define GMQCC_WARN __attribute__((warn_unused_result))
#else
#   define GMQCC_WARN
#endif
/*
 * This is a hack to silent clang regarding empty
 * body if statements.
 */
#define GMQCC_SUPRESS_EMPTY_BODY do { } while (0)

/*
 * Inline is not supported in < C90, however some compilers
 * like gcc and clang might have an inline attribute we can
 * use if present.
 */
#if __STDC_VERSION__ < 199901L
#   if defined(__GNUC__) || defined (__CLANG__)
#       if __GNUC__ < 2
#           define GMQCC_INLINE
#       else
#           define GMQCC_INLINE __attribute__ ((always_inline))
#       endif
#   else
#       define GMQCC_INLINE
#   endif
#else
#   define GMQCC_INLINE inline
#endif

/*
 * stdint.h and inttypes.h -less subset
 * for systems that don't have it, which we must
 * assume is all systems. (int8_t not required)
 */
#if   CHAR_MIN  == -128
    typedef unsigned char  uint8_t; /* same as below */
#elif SCHAR_MIN == -128
    typedef unsigned char  uint8_t; /* same as above */
#endif
#if   SHRT_MAX  == 0x7FFF
    typedef short          int16_t;
    typedef unsigned short uint16_t;
#elif INT_MAX   == 0x7FFF
    typedef int            int16_t;
    typedef unsigned int   uint16_t;
#endif
#if   INT_MAX   == 0x7FFFFFFF
    typedef int            int32_t;
    typedef unsigned int   uint32_t;
    typedef long           int64_t;
    typedef unsigned long  uint64_t;
#elif LONG_MAX  == 0x7FFFFFFF
    typedef long           int32_t;
    typedef unsigned long  uint32_t;

    /*
     * It's nearly impossible to figure out a 64bit type at
     * this point without making assumptions about the build
     * enviroment.  So if clang or gcc is detected use some
     * compiler builtins to create a 64 signed and unsigned
     * type.
     */
#   if defined(__GNUC__) || defined (__CLANG__)
        typedef int          int64_t  __attribute__((__mode__(__DI__)));
        typedef unsigned int uint64_t __attribute__((__mode__(__DI__)));
#   else
        /*
         * Incoorectly size the types so static assertions below will
         * fail.  There is no valid way to get a 64bit type at this point
         * without making assumptions of too many things.
         */
        typedef char         int64_t;
        typedef char         uint64_t;
#   endif
#endif
#ifdef _LP64 /* long pointer == 64 */
    typedef unsigned long  uintptr_t;
    typedef long           intptr_t;
#else
    typedef unsigned int   uintptr_t;
    typedef int            intptr_t;
#endif
/* Ensure type sizes are correct: */
typedef char uint8_size_is_correct  [sizeof(uint8_t)  == 1?1:-1];
typedef char uint16_size_if_correct [sizeof(uint16_t) == 2?1:-1];
typedef char uint32_size_is_correct [sizeof(uint32_t) == 4?1:-1];
typedef char uint64_size_is_correct [sizeof(uint64_t) == 8?1:-1];
typedef char int16_size_if_correct  [sizeof(int16_t)  == 2?1:-1];
typedef char int32_size_is_correct  [sizeof(int32_t)  == 4?1:-1];
typedef char int64_size_is_correct  [sizeof(int64_t)  == 8?1:-1];
/* intptr_t / uintptr_t correct size check */
typedef char uintptr_size_is_correct[sizeof(intptr_t) == sizeof(int*)?1:-1];
typedef char intptr_size_is_correct [sizeof(uintptr_t)== sizeof(int*)?1:-1];

/*===================================================================*/
/*============================ lex.c ================================*/
/*===================================================================*/
typedef struct lex_file_t {
    FILE *file;        /* file handler */
    char *name;        /* name of file */
    char  peek  [5];
    char  lastok[8192];

    int   last;    /* last token                   */
    int   current; /* current token                */
    int   length;  /* bytes left to parse          */
    int   size;    /* never changes (size of file) */
    int   line;    /* what line are we on?         */
} lex_file;

/*
 * It's important that this table never exceed 32 keywords, the ascii
 * table starts at 33 (and we don't want conflicts)
 */
enum {
    TOKEN_DO       ,
    TOKEN_ELSE     ,
    TOKEN_IF       ,
    TOKEN_WHILE    ,
    TOKEN_BREAK    ,
    TOKEN_CONTINUE ,
    TOKEN_RETURN   ,
    TOKEN_GOTO     ,
    TOKEN_FOR      ,   /* extension */
    TOKEN_TYPEDEF  ,   /* extension */

    /* ensure the token types are out of the  */
    /* bounds of anyothers that may conflict. */
    TOKEN_FLOAT    = 110,
    TOKEN_VECTOR        ,
    TOKEN_STRING        ,
    TOKEN_ENTITY        ,
    TOKEN_VOID
};

/*
 * Lexer state constants, these are numbers for where exactly in
 * the lexing the lexer is at. Or where it decided to stop if a lexer
 * error occurs.  These numbers must be > where the ascii-table ends
 * and > the last type token which is TOKEN_VOID
 */
enum {
    LEX_COMMENT = 1128,
    LEX_CHRLIT        ,
    LEX_STRLIT        ,
    LEX_IDENT
};

int       lex_token  (lex_file *);
void      lex_reset  (lex_file *);
void      lex_close  (lex_file *);
void      lex_parse  (lex_file *);
lex_file *lex_include(lex_file *, const char *);
void      lex_init   (const char *, lex_file **);

/*===================================================================*/
/*========================== error.c ================================*/
/*===================================================================*/
#define ERROR_LEX      (SHRT_MAX+0)
#define ERROR_PARSE    (SHRT_MAX+1)
#define ERROR_INTERNAL (SHRT_MAX+2)
#define ERROR_COMPILER (SHRT_MAX+3)
#define ERROR_PREPRO   (SHRT_MAX+4)
int error(lex_file *, int, const char *, ...);

/*===================================================================*/
/*========================== parse.c ================================*/
/*===================================================================*/
int parse_gen(lex_file *);

/*===================================================================*/
/*========================== typedef.c ==============================*/
/*===================================================================*/
typedef struct typedef_node_t {
    char      *name;
} typedef_node;

void          typedef_init();
void          typedef_clear();
typedef_node *typedef_find(const char *);
int           typedef_add (lex_file *file, const char *, const char *);


/*===================================================================*/
/*=========================== util.c ================================*/
/*===================================================================*/
void *util_memory_a      (unsigned int, unsigned int, const char *);
void  util_memory_d      (void       *, unsigned int, const char *);
void  util_meminfo       ();

bool  util_strupper      (const char *);
bool  util_strdigit      (const char *);
bool  util_strncmpexact  (const char *, const char *, size_t);
char *util_strdup        (const char *);
char *util_strrq         (const char *);
char *util_strrnl        (const char *);
char *util_strsws        (const char *);
char *util_strchp        (const char *, const char *);
void  util_debug         (const char *, const char *, ...);
int   util_getline       (char **, size_t *, FILE *);
void  util_endianswap    (void *,  int, int);

uint32_t util_crc32(const char *, int, register const short);

#ifdef NOTRACK
#    define mem_a(x) malloc(x)
#    define mem_d(x) free  (x)
#else
#    define mem_a(x) util_memory_a((x), __LINE__, __FILE__)
#    define mem_d(x) util_memory_d((x), __LINE__, __FILE__)
#endif

/*
 * TODO: make these safer to use.  Currently this only works on
 * x86 and x86_64, some systems will likely not like this. Such
 * as BE systems.
 */
#define FLT2INT(Y) *((int32_t*)&(Y))
#define INT2FLT(Y) *((float  *)&(Y))

/* Builds vector type (usefull for inside structures) */
#define VECTOR_SNAP(X,Y) X ## Y
#define VECTOR_FILL(X,Y) VECTOR_SNAP(X,Y)
#define VECTOR_TYPE(T,N)                                        \
    T*     N##_data      = NULL;                                \
    long   N##_elements  = 0;                                   \
    long   N##_allocated = 0
/* Builds vector add */
#define VECTOR_CORE(T,N)                                        \
    int    N##_add(T element) {                                 \
        void *temp = NULL;                                      \
        if (N##_elements == N##_allocated) {                    \
            if (N##_allocated == 0) {                           \
                N##_allocated = 12;                             \
            } else {                                            \
                N##_allocated *= 2;                             \
            }                                                   \
            if  (!(temp = mem_a(N##_allocated * sizeof(T)))) {  \
                mem_d(temp);                                    \
                return -1;                                      \
            }                                                   \
            memcpy(temp, N##_data, (N##_elements * sizeof(T))); \
            mem_d(N##_data);                                    \
            N##_data = (T*)temp;                                \
        }                                                       \
        N##_data[N##_elements] = element;                       \
        return   N##_elements++;                                \
    }                                                           \
    int N##_put(T* elements, size_t len) {                      \
        len     --;                                             \
        elements--;                                             \
        while (N##_add(*++elements) != -1 && len--);            \
        return N##_elements;                                    \
    }                                                           \
    typedef char VECTOR_FILL(extra_semicolon_,__COUNTER__)
#define VECTOR_PROT(T,N)                                        \
    extern T*     N##_data     ;                                \
    extern long   N##_elements ;                                \
    extern long   N##_allocated;                                \
    int           N##_add(T);                                   \
    int           N##_put(T *, size_t)
#define VECTOR_MAKE(T,N) \
    VECTOR_TYPE(T,N);    \
    VECTOR_CORE(T,N)

/*===================================================================*/
/*=========================== code.c ================================*/
/*===================================================================*/
enum {
    TYPE_VOID     ,
    TYPE_STRING   ,
    TYPE_FLOAT    ,
    TYPE_VECTOR   ,
    TYPE_ENTITY   ,
    TYPE_FIELD    ,
    TYPE_FUNCTION ,
    TYPE_POINTER  ,
    /* TYPE_INTEGER  , */
    TYPE_VARIANT
};

/*
 * Each paramater incerements by 3 since vector types hold
 * 3 components (x,y,z).
 */
#define OFS_NULL      0
#define OFS_RETURN    1
#define OFS_PARM0     (OFS_RETURN+3)
#define OFS_PARM1     (OFS_PARM0 +3)
#define OFS_PARM2     (OFS_PARM1 +3)
#define OFS_PARM3     (OFS_PARM2 +3)
#define OFS_PARM4     (OFS_PARM3 +3)
#define OFS_PARM5     (OFS_PARM4 +3)
#define OFS_PARM6     (OFS_PARM5 +3)
#define OFS_PARM7     (OFS_PARM6 +3)

typedef struct {
    uint16_t opcode;

    /* operand 1 */
    union {
        int16_t  s1; /* signed   */
        uint16_t u1; /* unsigned */
    } o1;
    /* operand 2 */
    union {
        int16_t  s1; /* signed   */
        uint16_t u1; /* unsigned */
    } o2;
    /* operand 3 */
    union {
        int16_t  s1; /* signed   */
        uint16_t u1; /* unsigned */
    } o3;

    /*
     * This is the same as the structure in darkplaces
     * {
     *     unsigned short op;
     *     short          a,b,c;
     * }
     * But this one is more sane to work with, and the
     * type sizes are guranteed.
     */
} prog_section_statement;

typedef struct {
    /* The types:
     * 0 = ev_void
     * 1 = ev_string
     * 2 = ev_float
     * 3 = ev_vector
     * 4 = ev_entity
     * 5 = ev_field
     * 6 = ev_function
     * 7 = ev_pointer -- engine only
     * 8 = ev_bad     -- engine only
     */
    uint16_t type;
    uint16_t offset;
    uint32_t name;
} prog_section_both;
typedef prog_section_both prog_section_def;
typedef prog_section_both prog_section_field;

typedef struct {
    int32_t   entry;      /* in statement table for instructions  */
    uint32_t  firstlocal; /* First local in local table           */
    uint32_t  locals;     /* Total ints of params + locals        */
    uint32_t  profile;    /* Always zero (engine uses this)       */
    uint32_t  name;       /* name of function in string table     */
    uint32_t  file;       /* file of the source file              */
    uint32_t  nargs;      /* number of arguments                  */
    uint8_t   argsize[8]; /* size of arguments (keep 8 always?)   */
} prog_section_function;

/*
 * Instructions
 * These are the external instructions supported by the interperter
 * this is what things compile to (from the C code).
 */
enum {
    INSTR_DONE,
    INSTR_MUL_F,
    INSTR_MUL_V,
    INSTR_MUL_FV,
    INSTR_MUL_VF,
    INSTR_DIV_F,
    INSTR_ADD_F,
    INSTR_ADD_V,
    INSTR_SUB_F,
    INSTR_SUB_V,
    INSTR_EQ_F,
    INSTR_EQ_V,
    INSTR_EQ_S,
    INSTR_EQ_E,
    INSTR_EQ_FNC,
    INSTR_NE_F,
    INSTR_NE_V,
    INSTR_NE_S,
    INSTR_NE_E,
    INSTR_NE_FNC,
    INSTR_LE,
    INSTR_GE,
    INSTR_LT,
    INSTR_GT,
    INSTR_LOAD_F,
    INSTR_LOAD_V,
    INSTR_LOAD_S,
    INSTR_LOAD_ENT,
    INSTR_LOAD_FLD,
    INSTR_LOAD_FNC,
    INSTR_ADDRESS,
    INSTR_STORE_F,
    INSTR_STORE_V,
    INSTR_STORE_S,
    INSTR_STORE_ENT,
    INSTR_STORE_FLD,
    INSTR_STORE_FNC,
    INSTR_STOREP_F,
    INSTR_STOREP_V,
    INSTR_STOREP_S,
    INSTR_STOREP_ENT,
    INSTR_STOREP_FLD,
    INSTR_STOREP_FNC,
    INSTR_RETURN,
    INSTR_NOT_F,
    INSTR_NOT_V,
    INSTR_NOT_S,
    INSTR_NOT_ENT,
    INSTR_NOT_FNC,
    INSTR_IF,
    INSTR_IFNOT,
    INSTR_CALL0,
    INSTR_CALL1,
    INSTR_CALL2,
    INSTR_CALL3,
    INSTR_CALL4,
    INSTR_CALL5,
    INSTR_CALL6,
    INSTR_CALL7,
    INSTR_CALL8,
    INSTR_STATE,
    INSTR_GOTO,
    INSTR_AND,
    INSTR_OR,
    INSTR_BITAND,
    INSTR_BITOR,

    /*
     * Virtual instructions used by the assembler
     * keep at the end but before virtual instructions
     * for the IR below.
     */
    AINSTR_END,

    /*
     * Virtual instructions used by the IR
     * Keep at the end!
     */
    VINSTR_PHI,
    VINSTR_JUMP,
    VINSTR_COND
};

/*
 * The symbols below are created by the following
 * expanded macros:
 *
 * VECTOR_MAKE(prog_section_statement, code_statements);
 * VECTOR_MAKE(prog_section_def,       code_defs      );
 * VECTOR_MAKE(prog_section_field,     code_fields    );
 * VECTOR_MAKE(prog_section_function,  code_functions );
 * VECTOR_MAKE(int,                    code_globals   );
 * VECTOR_MAKE(char,                   code_chars     );
 */
VECTOR_PROT(prog_section_statement, code_statements);
VECTOR_PROT(prog_section_statement, code_statements);
VECTOR_PROT(prog_section_def,       code_defs      );
VECTOR_PROT(prog_section_field,     code_fields    );
VECTOR_PROT(prog_section_function,  code_functions );
VECTOR_PROT(int,                    code_globals   );
VECTOR_PROT(char,                   code_chars     );

/*
 * code_write -- writes out the compiled file
 * code_init  -- prepares the code file
 */
bool     code_write       (const char *filename);
void     code_init        ();
uint32_t code_genstring   (const char *string);
uint32_t code_cachedstring(const char *string);

/*===================================================================*/
/*========================= assembler.c =============================*/
/*===================================================================*/
static const struct {
    const char  *m; /* menomic     */
    const size_t o; /* operands    */
    const size_t l; /* menomic len */
} asm_instr[] = {
    { "DONE"      , 1, 4 },
    { "MUL_F"     , 3, 5 },
    { "MUL_V"     , 3, 5 },
    { "MUL_FV"    , 3, 6 },
    { "MUL_VF"    , 3, 6 },
    { "DIV"       , 0, 3 },
    { "ADD_F"     , 3, 5 },
    { "ADD_V"     , 3, 5 },
    { "SUB_F"     , 3, 5 },
    { "DUB_V"     , 3, 5 },
    { "EQ_F"      , 0, 4 },
    { "EQ_V"      , 0, 4 },
    { "EQ_S"      , 0, 4 },
    { "EQ_E"      , 0, 4 },
    { "ES_FNC"    , 0, 6 },
    { "NE_F"      , 0, 4 },
    { "NE_V"      , 0, 4 },
    { "NE_S"      , 0, 4 },
    { "NE_E"      , 0, 4 },
    { "NE_FNC"    , 0, 6 },
    { "LE"        , 0, 2 },
    { "GE"        , 0, 2 },
    { "LT"        , 0, 2 },
    { "GT"        , 0, 2 },
    { "FIELD_F"   , 0, 7 },
    { "FIELD_V"   , 0, 7 },
    { "FIELD_S"   , 0, 7 },
    { "FIELD_ENT" , 0, 9 },
    { "FIELD_FLD" , 0, 9 },
    { "FIELD_FNC" , 0, 9 },
    { "ADDRESS"   , 0, 7 },
    { "STORE_F"   , 0, 7 },
    { "STORE_V"   , 0, 7 },
    { "STORE_S"   , 0, 7 },
    { "STORE_ENT" , 0, 9 },
    { "STORE_FLD" , 0, 9 },
    { "STORE_FNC" , 0, 9 },
    { "STOREP_F"  , 0, 8 },
    { "STOREP_V"  , 0, 8 },
    { "STOREP_S"  , 0, 8 },
    { "STOREP_ENT", 0, 10},
    { "STOREP_FLD", 0, 10},
    { "STOREP_FNC", 0, 10},
    { "RETURN"    , 0, 6 },
    { "NOT_F"     , 0, 5 },
    { "NOT_V"     , 0, 5 },
    { "NOT_S"     , 0, 5 },
    { "NOT_ENT"   , 0, 7 },
    { "NOT_FNC"   , 0, 7 },
    { "IF"        , 0, 2 },
    { "IFNOT"     , 0, 5 },
    { "CALL0"     , 1, 5 },
    { "CALL1"     , 2, 5 },
    { "CALL2"     , 3, 5 },
    { "CALL3"     , 4, 5 },
    { "CALL4"     , 5, 5 },
    { "CALL5"     , 6, 5 },
    { "CALL6"     , 7, 5 },
    { "CALL7"     , 8, 5 },
    { "CALL8"     , 9, 5 },
    { "STATE"     , 0, 5 },
    { "GOTO"      , 0, 4 },
    { "AND"       , 0, 3 },
    { "OR"        , 0, 2 },
    { "BITAND"    , 0, 6 },
    { "BITOR"     , 0, 5 },
    { "END"       , 0, 3 } /* virtual assembler instruction */
};

void asm_init (const char *, FILE **);
void asm_close(FILE *);
void asm_parse(FILE *);
/*===================================================================*/
/*============================= main.c ==============================*/
/*===================================================================*/
enum {
    COMPILER_QCC,     /* circa  QuakeC */
    COMPILER_FTEQCC,  /* fteqcc QuakeC */
    COMPILER_QCCX,    /* qccx   QuakeC */
    COMPILER_GMQCC    /* this   QuakeC */
};
extern bool opts_debug;
extern bool opts_memchk;
extern bool opts_darkplaces_stringtablebug;
extern bool opts_omit_nullcode;
extern int  opts_compiler;
/*===================================================================*/
/*============================= ast.c ===============================*/
/*===================================================================*/
#define MEM_VECTOR_PROTO(Towner, Tmem, mem)                   \
    bool GMQCC_WARN Towner##_##mem##_add(Towner*, Tmem);      \
    bool GMQCC_WARN Towner##_##mem##_remove(Towner*, size_t)

#define MEM_VECTOR_PROTO_ALL(Towner, Tmem, mem)                    \
    MEM_VECTOR_PROTO(Towner, Tmem, mem);                           \
    bool GMQCC_WARN Towner##_##mem##_find(Towner*, Tmem, size_t*); \
    void Towner##_##mem##_clear(Towner*)

#define MEM_VECTOR_MAKE(Twhat, name) \
    Twhat  *name;                    \
    size_t name##_count;             \
    size_t name##_alloc

#define _MEM_VEC_FUN_ADD(Tself, Twhat, mem)                          \
bool GMQCC_WARN Tself##_##mem##_add(Tself *self, Twhat f)            \
{                                                                    \
    Twhat *reall;                                                    \
    if (self->mem##_count == self->mem##_alloc) {                    \
        if (!self->mem##_alloc) {                                    \
            self->mem##_alloc = 16;                                  \
        } else {                                                     \
            self->mem##_alloc *= 2;                                  \
        }                                                            \
        reall = (Twhat*)mem_a(sizeof(Twhat) * self->mem##_alloc);    \
        if (!reall) {                                                \
            return false;                                            \
        }                                                            \
        memcpy(reall, self->mem, sizeof(Twhat) * self->mem##_count); \
        mem_d(self->mem);                                            \
        self->mem = reall;                                           \
    }                                                                \
    self->mem[self->mem##_count++] = f;                              \
    return true;                                                     \
}

#define _MEM_VEC_FUN_REMOVE(Tself, Twhat, mem)                       \
bool GMQCC_WARN Tself##_##mem##_remove(Tself *self, size_t idx)      \
{                                                                    \
    size_t i;                                                        \
    Twhat *reall;                                                    \
    if (idx >= self->mem##_count) {                                  \
        return true; /* huh... */                                    \
    }                                                                \
    for (i = idx; i < self->mem##_count-1; ++i) {                    \
        self->mem[i] = self->mem[i+1];                               \
    }                                                                \
    self->mem##_count--;                                             \
    if (self->mem##_count < self->mem##_count/2) {                   \
        self->mem##_alloc /= 2;                                      \
        reall = (Twhat*)mem_a(sizeof(Twhat) * self->mem##_count);    \
        if (!reall) {                                                \
            return false;                                            \
        }                                                            \
        memcpy(reall, self->mem, sizeof(Twhat) * self->mem##_count); \
        mem_d(self->mem);                                            \
        self->mem = reall;                                           \
    }                                                                \
    return true;                                                     \
}

#define _MEM_VEC_FUN_FIND(Tself, Twhat, mem)                    \
bool GMQCC_WARN Tself##_##mem##_find(Tself *self, Twhat obj, size_t *idx) \
{                                                               \
    size_t i;                                                   \
    for (i = 0; i < self->mem##_count; ++i) {                   \
        if (self->mem[i] == obj) {                              \
            if (idx) {                                          \
                *idx = i;                                       \
            }                                                   \
            return true;                                        \
        }                                                       \
    }                                                           \
    return false;                                               \
}

#define _MEM_VEC_FUN_CLEAR(Tself, mem)  \
void Tself##_##mem##_clear(Tself *self) \
{                                       \
    if (!self->mem)                     \
        return;                         \
    mem_d((void*) self->mem);           \
    self->mem = NULL;                   \
    self->mem##_count = 0;              \
    self->mem##_alloc = 0;              \
}

#define MEM_VECTOR_CLEAR(owner, mem)  \
    if ((owner)->mem)                 \
        mem_d((void*)((owner)->mem)); \
    (owner)->mem = NULL;              \
    (owner)->mem##_count = 0;         \
    (owner)->mem##_alloc = 0

#define MEM_VECTOR_INIT(owner, mem) \
{                                   \
    (owner)->mem = NULL;            \
    (owner)->mem##_count = 0;       \
    (owner)->mem##_alloc = 0;       \
}

#define MEM_VEC_FUNCTIONS(Tself, Twhat, mem) \
_MEM_VEC_FUN_REMOVE(Tself, Twhat, mem)       \
_MEM_VEC_FUN_ADD(Tself, Twhat, mem)

#define MEM_VEC_FUNCTIONS_ALL(Tself, Twhat, mem) \
MEM_VEC_FUNCTIONS(Tself, Twhat, mem)             \
_MEM_VEC_FUN_CLEAR(Tself, mem)                   \
_MEM_VEC_FUN_FIND(Tself, Twhat, mem)

enum store_types {
    store_global,
    store_local,  /* local, assignable for now, should get promoted later */
    store_value   /* unassignable */
};

typedef struct {
    float x, y, z;
} vector;

/*
 * A shallow copy of a lex_file to remember where which ast node
 * came from.
 */
typedef struct {
    const char *file;
    size_t      line;
} lex_ctx;
#endif