gmqcc/code.c

/*
 * Copyright (C) 2012 
 *     Dale Weiler
 *
 * 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.
 */
#include "gmqcc.h"

typedef struct {
    uint32_t offset;      /* Offset in file of where data begins  */
    uint32_t length;      /* Length of section (how many of)      */
} prog_section;

typedef struct {
    uint16_t     version;      /* Program version (6)     */
    uint16_t     flags;        /* see propsal.txt         */
    uint16_t     crc16;        /* What is this?           */
    uint16_t     skip;         /* see propsal.txt         */
    
    prog_section statements;   /* prog_section_statement  */
    prog_section defs;         /* prog_section_def        */
    prog_section fields;       /* prog_section_field      */
    prog_section functions;    /* prog_section_function   */
    prog_section strings;      /* What is this?           */
    prog_section globals;      /* What is this?           */
    uint32_t     entfield;     /* Number of entity fields */
} prog_header;

/*
 * The macros below expand to a typesafe vector implementation, which
 * can be viewed in gmqcc.h
 * 
 * code_statements_data      -- raw prog_section_statement array
 * code_statements_elements  -- number of elements
 * code_statements_allocated -- size of the array allocated
 * code_statements_add(T)    -- add element (returns -1 on error)
 * 
 * code_vars_data            -- raw prog_section_var array
 * code_vars_elements        -- number of elements
 * code_vars_allocated       -- size of the array allocated
 * code_vars_add(T)          -- add element (returns -1 on error)
 * 
 * code_fields_data          -- raw prog_section_field array
 * code_fields_elements      -- number of elements
 * code_fields_allocated     -- size of the array allocated
 * code_fields_add(T)        -- add element (returns -1 on error)
 *
 * code_functions_data       -- raw prog_section_function array
 * code_functions_elements   -- number of elements
 * code_functions_allocated  -- size of the array allocated
 * code_functions_add(T)     -- add element (returns -1 on error)
 * 
 * code_globals_data         -- raw prog_section_def array
 * code_globals_elements     -- number of elements
 * code_globals_allocated    -- size of the array allocated
 * code_globals_add(T)       -- add element (returns -1 on error)
 * 
 * code_chars_data           -- raw char* array
 * code_chars_elements       -- number of elements
 * code_chars_allocated      -- size of the array allocated
 * code_chars_add(T)         -- add element (returns -1 on error)
 */
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     );

int code_strings_add(const char *src) {
    size_t size = strlen(src);
    size_t iter = 0;
    while (iter < size)
        code_chars_add(src[iter++]);
    code_chars_add('\0');
    return code_chars_elements;
}

void code_init() {
    /* omit creation of null code */
    if (opts_omit_nullcode)
        return;
        
    /*
     * The way progs.dat is suppose to work is odd, there needs to be
     * some null (empty) statements, functions, and 28 globals
     */
    prog_section_function  empty_function  = {0,0,0,0,0,0,0,{0}};
    prog_section_statement empty_statement = {0,{0},{0},{0}};
    int i;
    for(i = 0; i < 28; i++)
        code_globals_add(0);
        
    code_chars_add     ('\0');
    code_functions_add (empty_function);
    code_statements_add(empty_statement);
}

void code_test() {    
    code_strings_add("m_init");
    code_strings_add("print");
    code_strings_add("hello world\n");
    code_strings_add("m_keydown");
    code_strings_add("m_draw");
    code_strings_add("m_toggle");
    code_strings_add("m_shutdown");
    
    code_globals_add(1);  /* m_init */
    code_globals_add(2);  /* print  */
    code_globals_add(14); /* hello world in string table */
    
    /* now the defs */
    code_defs_add((prog_section_def){.type=TYPE_VOID,    .offset=28/*globals[28]*/, .name=1 }); /* m_init */
    code_defs_add((prog_section_def){.type=TYPE_FUNCTION,.offset=29/*globals[29]*/, .name=8 }); /* print  */
    code_defs_add((prog_section_def){.type=TYPE_STRING,  .offset=30/*globals[30]*/, .name=14}); /*hello_world*/
    
    code_functions_add((prog_section_function){1,  0, 0, 0, .name=1, 0, 0, {0}}); /* m_init */
    code_functions_add((prog_section_function){-4, 0, 0, 0, .name=8, 0, 0, {0}}); /* print  */
    code_functions_add((prog_section_function){0,  0, 0, 0, .name=14+13,        0,0, {0}}); /* m_keydown */
    code_functions_add((prog_section_function){0,  0, 0, 0, .name=14+13+10,     0,0, {0}});
    code_functions_add((prog_section_function){0,  0, 0, 0, .name=14+13+10+7,   0,0, {0}});
    code_functions_add((prog_section_function){0,  0, 0, 0, .name=14+13+10+7+9, 0,0, {0}});
    
    code_statements_add((prog_section_statement){INSTR_STORE_F, {30}/*30 is hello_world */, {OFS_PARM0}, {0}});
    code_statements_add((prog_section_statement){INSTR_CALL1,   {29}/*29 is print       */, {0},         {0}});
    code_statements_add((prog_section_statement){INSTR_RETURN,  {0},                        {0},         {0}});
}

void code_write() {
    prog_header code_header={0};

    /* see proposal.txt */
    if (opts_omit_nullcode) {
        code_header.skip   = 28;
        code_header.flags  = 1;
    }
    
    code_header.version    = 6;
    code_header.crc16      = 0; /* TODO: */
    code_header.statements = (prog_section){sizeof(prog_header), code_statements_elements };
    code_header.defs       = (prog_section){code_header.statements.offset + sizeof(prog_section_statement)*code_statements_elements,  code_defs_elements      };
    code_header.fields     = (prog_section){code_header.defs.offset       + sizeof(prog_section_def)      *code_defs_elements,        code_fields_elements    };
    code_header.functions  = (prog_section){code_header.fields.offset     + sizeof(prog_section_field)    *code_fields_elements,      code_functions_elements };
    code_header.globals    = (prog_section){code_header.functions.offset  + sizeof(prog_section_function) *code_functions_elements,   code_globals_elements   };
    code_header.strings    = (prog_section){code_header.globals.offset    + sizeof(int)                   *code_globals_elements,     code_chars_elements     };
    code_header.entfield   = 0; /* TODO: */

    if (opts_darkplaces_stringtablebug) {
        util_debug("GEN", "Patching stringtable for -fdarkplaces-stringtablebug\n");

        /* >= + P */
        code_chars_add('\0'); /* > */
        code_chars_add('\0'); /* = */
        code_chars_add('\0'); /* P */
    }
        
    /* ensure all data is in LE format */
    util_endianswap(&code_header,         1,                        sizeof(prog_header));
    util_endianswap(code_statements_data, code_statements_elements, sizeof(prog_section_statement));
    util_endianswap(code_defs_data,       code_defs_elements,       sizeof(prog_section_def));
    util_endianswap(code_fields_data,     code_fields_elements,     sizeof(prog_section_field));
    util_endianswap(code_functions_data,  code_functions_elements,  sizeof(prog_section_function));
    util_endianswap(code_globals_data,    code_globals_elements,    sizeof(int));
    
    FILE *fp = fopen("program.dat", "wb");
    fwrite(&code_header,         1, sizeof(prog_header), fp);
    fwrite(code_statements_data, 1, sizeof(prog_section_statement)*code_statements_elements, fp);
    fwrite(code_defs_data,       1, sizeof(prog_section_def)      *code_defs_elements,       fp);
    fwrite(code_fields_data,     1, sizeof(prog_section_field)    *code_fields_elements,     fp);
    fwrite(code_functions_data,  1, sizeof(prog_section_function) *code_functions_elements,  fp);
    fwrite(code_globals_data,    1, sizeof(int)                   *code_globals_elements,    fp);
    fwrite(code_chars_data,      1, 1                             *code_chars_elements,      fp);
    
    util_debug("GEN","HEADER:\n");
    util_debug("GEN","    version:    = %d\n", code_header.version );
    util_debug("GEN","    crc16:      = %d\n", code_header.crc16   );
    util_debug("GEN","    entfield:   = %d\n", code_header.entfield);
    util_debug("GEN","    statements  = {.offset = % 8d, .length = % 8d}\n", code_header.statements.offset, code_header.statements.length);
    util_debug("GEN","    defs        = {.offset = % 8d, .length = % 8d}\n", code_header.defs      .offset, code_header.defs      .length);
    util_debug("GEN","    fields      = {.offset = % 8d, .length = % 8d}\n", code_header.fields    .offset, code_header.fields    .length);
    util_debug("GEN","    functions   = {.offset = % 8d, .length = % 8d}\n", code_header.functions .offset, code_header.functions .length);
    util_debug("GEN","    globals     = {.offset = % 8d, .length = % 8d}\n", code_header.globals   .offset, code_header.globals   .length);
    util_debug("GEN","    strings     = {.offset = % 8d, .length = % 8d}\n", code_header.strings   .offset, code_header.strings   .length);
    
    /* FUNCTIONS */
    util_debug("GEN", "FUNCTIONS:\n");
    size_t i = 1;
    for (; i < code_functions_elements; i++) {
        size_t j = code_functions_data[i].entry;
        util_debug("GEN", "    {.entry =% 5d, .firstlocal =% 5d, .locals =% 5d, .profile =% 5d, .name =% 5d, .file =% 5d, .nargs =% 5d, .argsize =%0X }\n",
            code_functions_data[i].entry,
            code_functions_data[i].firstlocal,
            code_functions_data[i].locals,
            code_functions_data[i].profile,
            code_functions_data[i].name,
            code_functions_data[i].file,
            code_functions_data[i].nargs,
            *((int32_t*)&code_functions_data[i].argsize)
        );
        util_debug("GEN", "    NAME: %s\n", &code_chars_data[code_functions_data[i].name]);
        util_debug("GEN", "    CODE:\n");
        for (;;) {
            if (code_statements_data[j].opcode != INSTR_DONE &&
                code_statements_data[j].opcode != INSTR_RETURN)
                util_debug("GEN", "        %s {0x%05d,0x%05d,0x%05d}\n",
                    asm_instr[code_statements_data[j].opcode].m,
                    code_statements_data[j].s1,
                    code_statements_data[j].s2,
                    code_statements_data[j].s3
                );
            else break;
            j++;
        }
    }
    
    mem_d(code_statements_data);
    mem_d(code_defs_data);
    mem_d(code_fields_data);
    mem_d(code_functions_data);
    mem_d(code_globals_data);
    mem_d(code_chars_data);
    fclose(fp);
}