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src/il-gen.c  view on Meta::CPAN

/* defined if structures are passed as pointers. Otherwise structures
   are directly pushed on stack. */
/* #define FUNC_STRUCT_PARAM_AS_PTR */

/* pointer size, in bytes */
#define PTR_SIZE 4

/* long double size and alignment, in bytes */
#define LDOUBLE_SIZE  8
#define LDOUBLE_ALIGN 8

/* function call context */
typedef struct GFuncContext {
    int func_call; /* func call type (FUNC_STDCALL or FUNC_CDECL) */
} GFuncContext;

/******************************************************/
/* opcode definitions */

#define IL_OP_PREFIX 0xFE

enum ILOPCodes {
#define OP(name, str, n) IL_OP_ ## name = n,
#include "il-opcodes.h"
#undef OP
};

char *il_opcodes_str[] = {
#define OP(name, str, n) [n] = str,
#include "il-opcodes.h"
#undef OP
};

/******************************************************/

/* arguments variable numbers start from there */
#define ARG_BASE 0x70000000

static FILE *il_outfile;

static void out_byte(int c)
{
    *(char *)ind++ = c;
}

static void out_le32(int c)
{
    out_byte(c);
    out_byte(c >> 8);
    out_byte(c >> 16);
    out_byte(c >> 24);
}

static void init_outfile(void)
{
    if (!il_outfile) {
        il_outfile = stdout;
        fprintf(il_outfile, 
                ".assembly extern mscorlib\n"
                "{\n"
                ".ver 1:0:2411:0\n"
                "}\n\n");
    }
}

static void out_op1(int op)
{
    if (op & 0x100)
        out_byte(IL_OP_PREFIX);
    out_byte(op & 0xff);
}

/* output an opcode with prefix */
static void out_op(int op)
{
    out_op1(op);
    fprintf(il_outfile, " %s\n", il_opcodes_str[op]);
}

static void out_opb(int op, int c)
{
    out_op1(op);
    out_byte(c);
    fprintf(il_outfile, " %s %d\n", il_opcodes_str[op], c);
}

static void out_opi(int op, int c)
{
    out_op1(op);
    out_le32(c);
    fprintf(il_outfile, " %s 0x%x\n", il_opcodes_str[op], c);
}

/* XXX: not complete */
static void il_type_to_str(char *buf, int buf_size, 
                           int t, const char *varstr)
{
    int bt;
    Sym *s, *sa;
    char buf1[256];
    const char *tstr;

    t = t & VT_TYPE;
    bt = t & VT_BTYPE;
    buf[0] = '\0';
    if (t & VT_UNSIGNED)
        pstrcat(buf, buf_size, "unsigned ");
    switch(bt) {
    case VT_VOID:
        tstr = "void";
        goto add_tstr;
    case VT_BOOL:
        tstr = "bool";
        goto add_tstr;
    case VT_BYTE:
        tstr = "int8";
        goto add_tstr;
    case VT_SHORT:
        tstr = "int16";
        goto add_tstr;
    case VT_ENUM: