656 lines
16 KiB
C
656 lines
16 KiB
C
/*
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* CIL code generator for TCC
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*
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* Copyright (c) 2002 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* number of available registers */
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#define NB_REGS 3
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/* a register can belong to several classes. The classes must be
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sorted from more general to more precise (see gv2() code which does
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assumptions on it). */
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#define RC_ST 0x0001 /* any stack entry */
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#define RC_ST0 0x0002 /* top of stack */
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#define RC_ST1 0x0004 /* top - 1 */
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#define RC_INT RC_ST
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#define RC_FLOAT RC_ST
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#define RC_IRET RC_ST0 /* function return: integer register */
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#define RC_LRET RC_ST0 /* function return: second integer register */
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#define RC_FRET RC_ST0 /* function return: float register */
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/* pretty names for the registers */
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enum {
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REG_ST0 = 0,
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REG_ST1,
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REG_ST2,
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};
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const int reg_classes[NB_REGS] = {
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/* ST0 */ RC_ST | RC_ST0,
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/* ST1 */ RC_ST | RC_ST1,
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/* ST2 */ RC_ST,
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};
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/* return registers for function */
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#define REG_IRET REG_ST0 /* single word int return register */
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#define REG_LRET REG_ST0 /* second word return register (for long long) */
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#define REG_FRET REG_ST0 /* float return register */
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/* defined if function parameters must be evaluated in reverse order */
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/* #define INVERT_FUNC_PARAMS */
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/* defined if structures are passed as pointers. Otherwise structures
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are directly pushed on stack. */
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/* #define FUNC_STRUCT_PARAM_AS_PTR */
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/* pointer size, in bytes */
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#define PTR_SIZE 4
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/* long double size and alignment, in bytes */
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#define LDOUBLE_SIZE 8
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#define LDOUBLE_ALIGN 8
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/* function call context */
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typedef struct GFuncContext {
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int func_call; /* func call type (FUNC_STDCALL or FUNC_CDECL) */
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} GFuncContext;
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/******************************************************/
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/* opcode definitions */
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#define IL_OP_PREFIX 0xFE
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enum ILOPCodes {
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#define OP(name, str, n) IL_OP_ ## name = n,
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#include "il-opcodes.h"
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#undef OP
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};
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char *il_opcodes_str[] = {
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#define OP(name, str, n) [n] = str,
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#include "il-opcodes.h"
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#undef OP
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};
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/******************************************************/
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/* arguments variable numbers start from there */
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#define ARG_BASE 0x70000000
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static FILE *il_outfile;
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static void out_byte(int c)
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{
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*(char *)ind++ = c;
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}
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static void out_le32(int c)
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{
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out_byte(c);
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out_byte(c >> 8);
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out_byte(c >> 16);
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out_byte(c >> 24);
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}
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static void init_outfile(void)
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{
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if (!il_outfile) {
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il_outfile = stdout;
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fprintf(il_outfile,
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".assembly extern mscorlib\n"
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"{\n"
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".ver 1:0:2411:0\n"
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"}\n\n");
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}
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}
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static void out_op1(int op)
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{
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if (op & 0x100)
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out_byte(IL_OP_PREFIX);
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out_byte(op & 0xff);
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}
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/* output an opcode with prefix */
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static void out_op(int op)
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{
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out_op1(op);
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fprintf(il_outfile, " %s\n", il_opcodes_str[op]);
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}
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static void out_opb(int op, int c)
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{
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out_op1(op);
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out_byte(c);
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fprintf(il_outfile, " %s %d\n", il_opcodes_str[op], c);
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}
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static void out_opi(int op, int c)
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{
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out_op1(op);
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out_le32(c);
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fprintf(il_outfile, " %s 0x%x\n", il_opcodes_str[op], c);
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}
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/* XXX: not complete */
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static void il_type_to_str(char *buf, int buf_size,
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int t, const char *varstr)
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{
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int bt;
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Sym *s, *sa;
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char buf1[256];
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const char *tstr;
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t = t & VT_TYPE;
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bt = t & VT_BTYPE;
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buf[0] = '\0';
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if (t & VT_UNSIGNED)
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pstrcat(buf, buf_size, "unsigned ");
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switch(bt) {
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case VT_VOID:
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tstr = "void";
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goto add_tstr;
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case VT_BOOL:
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tstr = "bool";
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goto add_tstr;
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case VT_BYTE:
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tstr = "int8";
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goto add_tstr;
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case VT_SHORT:
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tstr = "int16";
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goto add_tstr;
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case VT_ENUM:
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case VT_INT:
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case VT_LONG:
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tstr = "int32";
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goto add_tstr;
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case VT_LLONG:
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tstr = "int64";
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goto add_tstr;
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case VT_FLOAT:
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tstr = "float32";
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goto add_tstr;
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case VT_DOUBLE:
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case VT_LDOUBLE:
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tstr = "float64";
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add_tstr:
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pstrcat(buf, buf_size, tstr);
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break;
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case VT_STRUCT:
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tcc_error("structures not handled yet");
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break;
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case VT_FUNC:
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s = sym_find((unsigned)t >> VT_STRUCT_SHIFT);
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il_type_to_str(buf, buf_size, s->t, varstr);
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pstrcat(buf, buf_size, "(");
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sa = s->next;
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while (sa != NULL) {
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il_type_to_str(buf1, sizeof(buf1), sa->t, NULL);
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pstrcat(buf, buf_size, buf1);
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sa = sa->next;
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if (sa)
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pstrcat(buf, buf_size, ", ");
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}
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pstrcat(buf, buf_size, ")");
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goto no_var;
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case VT_PTR:
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s = sym_find((unsigned)t >> VT_STRUCT_SHIFT);
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pstrcpy(buf1, sizeof(buf1), "*");
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if (varstr)
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pstrcat(buf1, sizeof(buf1), varstr);
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il_type_to_str(buf, buf_size, s->t, buf1);
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goto no_var;
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}
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if (varstr) {
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pstrcat(buf, buf_size, " ");
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pstrcat(buf, buf_size, varstr);
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}
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no_var: ;
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}
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/* patch relocation entry with value 'val' */
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void greloc_patch1(Reloc *p, int val)
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{
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}
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/* output a symbol and patch all calls to it */
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void gsym_addr(t, a)
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{
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}
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/* output jump and return symbol */
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static int out_opj(int op, int c)
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{
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out_op1(op);
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out_le32(0);
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if (c == 0) {
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c = ind - (int)cur_text_section->data;
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}
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fprintf(il_outfile, " %s L%d\n", il_opcodes_str[op], c);
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return c;
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}
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void gsym(int t)
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{
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fprintf(il_outfile, "L%d:\n", t);
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}
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/* load 'r' from value 'sv' */
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void load(int r, SValue *sv)
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{
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int v, fc, ft;
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v = sv->r & VT_VALMASK;
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fc = sv->c.i;
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ft = sv->t;
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if (sv->r & VT_LVAL) {
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if (v == VT_LOCAL) {
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if (fc >= ARG_BASE) {
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fc -= ARG_BASE;
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if (fc >= 0 && fc <= 4) {
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out_op(IL_OP_LDARG_0 + fc);
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} else if (fc <= 0xff) {
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out_opb(IL_OP_LDARG_S, fc);
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} else {
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out_opi(IL_OP_LDARG, fc);
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}
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} else {
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if (fc >= 0 && fc <= 4) {
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out_op(IL_OP_LDLOC_0 + fc);
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} else if (fc <= 0xff) {
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out_opb(IL_OP_LDLOC_S, fc);
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} else {
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out_opi(IL_OP_LDLOC, fc);
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}
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}
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} else if (v == VT_CONST) {
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/* XXX: handle globals */
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out_opi(IL_OP_LDSFLD, 0);
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} else {
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if ((ft & VT_BTYPE) == VT_FLOAT) {
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out_op(IL_OP_LDIND_R4);
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} else if ((ft & VT_BTYPE) == VT_DOUBLE) {
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out_op(IL_OP_LDIND_R8);
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} else if ((ft & VT_BTYPE) == VT_LDOUBLE) {
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out_op(IL_OP_LDIND_R8);
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} else if ((ft & VT_TYPE) == VT_BYTE)
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out_op(IL_OP_LDIND_I1);
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else if ((ft & VT_TYPE) == (VT_BYTE | VT_UNSIGNED))
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out_op(IL_OP_LDIND_U1);
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else if ((ft & VT_TYPE) == VT_SHORT)
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out_op(IL_OP_LDIND_I2);
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else if ((ft & VT_TYPE) == (VT_SHORT | VT_UNSIGNED))
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out_op(IL_OP_LDIND_U2);
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else
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out_op(IL_OP_LDIND_I4);
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}
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} else {
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if (v == VT_CONST) {
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/* XXX: handle globals */
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if (fc >= -1 && fc <= 8) {
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out_op(IL_OP_LDC_I4_M1 + fc + 1);
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} else {
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out_opi(IL_OP_LDC_I4, fc);
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}
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} else if (v == VT_LOCAL) {
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if (fc >= ARG_BASE) {
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fc -= ARG_BASE;
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if (fc <= 0xff) {
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out_opb(IL_OP_LDARGA_S, fc);
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} else {
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out_opi(IL_OP_LDARGA, fc);
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}
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} else {
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if (fc <= 0xff) {
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out_opb(IL_OP_LDLOCA_S, fc);
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} else {
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out_opi(IL_OP_LDLOCA, fc);
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}
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}
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} else {
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/* XXX: do it */
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}
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}
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}
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/* store register 'r' in lvalue 'v' */
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void store(int r, SValue *sv)
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{
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int v, fc, ft;
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v = sv->r & VT_VALMASK;
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fc = sv->c.i;
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ft = sv->t;
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if (v == VT_LOCAL) {
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if (fc >= ARG_BASE) {
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fc -= ARG_BASE;
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/* XXX: check IL arg store semantics */
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if (fc <= 0xff) {
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out_opb(IL_OP_STARG_S, fc);
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} else {
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out_opi(IL_OP_STARG, fc);
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}
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} else {
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if (fc >= 0 && fc <= 4) {
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out_op(IL_OP_STLOC_0 + fc);
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} else if (fc <= 0xff) {
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out_opb(IL_OP_STLOC_S, fc);
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} else {
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out_opi(IL_OP_STLOC, fc);
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}
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}
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} else if (v == VT_CONST) {
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/* XXX: handle globals */
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out_opi(IL_OP_STSFLD, 0);
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} else {
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if ((ft & VT_BTYPE) == VT_FLOAT)
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out_op(IL_OP_STIND_R4);
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else if ((ft & VT_BTYPE) == VT_DOUBLE)
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out_op(IL_OP_STIND_R8);
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else if ((ft & VT_BTYPE) == VT_LDOUBLE)
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out_op(IL_OP_STIND_R8);
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else if ((ft & VT_BTYPE) == VT_BYTE)
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out_op(IL_OP_STIND_I1);
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else if ((ft & VT_BTYPE) == VT_SHORT)
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out_op(IL_OP_STIND_I2);
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else
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out_op(IL_OP_STIND_I4);
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}
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}
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/* start function call and return function call context */
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void gfunc_start(GFuncContext *c, int func_call)
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{
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c->func_call = func_call;
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}
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/* push function parameter which is in (vtop->t, vtop->c). Stack entry
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is then popped. */
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void gfunc_param(GFuncContext *c)
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{
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if ((vtop->t & VT_BTYPE) == VT_STRUCT) {
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tcc_error("structures passed as value not handled yet");
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} else {
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/* simply push on stack */
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gv(RC_ST0);
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}
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vtop--;
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}
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/* generate function call with address in (vtop->t, vtop->c) and free function
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context. Stack entry is popped */
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void gfunc_call(GFuncContext *c)
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{
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char buf[1024];
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if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
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/* XXX: more info needed from tcc */
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il_type_to_str(buf, sizeof(buf), vtop->t, "xxx");
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fprintf(il_outfile, " call %s\n", buf);
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} else {
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/* indirect call */
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gv(RC_INT);
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il_type_to_str(buf, sizeof(buf), vtop->t, NULL);
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fprintf(il_outfile, " calli %s\n", buf);
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}
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vtop--;
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}
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/* generate function prolog of type 't' */
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void gfunc_prolog(int t)
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{
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int addr, u, func_call;
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Sym *sym;
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char buf[1024];
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init_outfile();
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/* XXX: pass function name to gfunc_prolog */
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il_type_to_str(buf, sizeof(buf), t, funcname);
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fprintf(il_outfile, ".method static %s il managed\n", buf);
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fprintf(il_outfile, "{\n");
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/* XXX: cannot do better now */
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fprintf(il_outfile, " .maxstack %d\n", NB_REGS);
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fprintf(il_outfile, " .locals (int32, int32, int32, int32, int32, int32, int32, int32)\n");
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if (!strcmp(funcname, "main"))
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fprintf(il_outfile, " .entrypoint\n");
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sym = sym_find((unsigned)t >> VT_STRUCT_SHIFT);
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func_call = sym->r;
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addr = ARG_BASE;
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/* if the function returns a structure, then add an
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implicit pointer parameter */
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func_vt = sym->t;
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func_var = (sym->c == FUNC_ELLIPSIS);
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if ((func_vt & VT_BTYPE) == VT_STRUCT) {
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func_vc = addr;
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addr++;
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}
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/* define parameters */
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while ((sym = sym->next) != NULL) {
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u = sym->t;
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sym_push(sym->v & ~SYM_FIELD, u,
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VT_LOCAL | lvalue_type(sym->type.t), addr);
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addr++;
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}
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}
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/* generate function epilog */
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void gfunc_epilog(void)
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{
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out_op(IL_OP_RET);
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fprintf(il_outfile, "}\n\n");
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}
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/* generate a jump to a label */
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int gjmp(int t)
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{
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return out_opj(IL_OP_BR, t);
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}
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/* generate a jump to a fixed address */
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void gjmp_addr(int a)
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{
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/* XXX: handle syms */
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out_opi(IL_OP_BR, a);
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}
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/* generate a test. set 'inv' to invert test. Stack entry is popped */
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int gtst(int inv, int t)
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{
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int v, *p, c;
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v = vtop->r & VT_VALMASK;
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if (v == VT_CMP) {
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c = vtop->c.i ^ inv;
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switch(c) {
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case TOK_EQ:
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c = IL_OP_BEQ;
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break;
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case TOK_NE:
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c = IL_OP_BNE_UN;
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break;
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case TOK_LT:
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c = IL_OP_BLT;
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break;
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case TOK_LE:
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c = IL_OP_BLE;
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break;
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case TOK_GT:
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c = IL_OP_BGT;
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break;
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case TOK_GE:
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c = IL_OP_BGE;
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break;
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case TOK_ULT:
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c = IL_OP_BLT_UN;
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break;
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case TOK_ULE:
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c = IL_OP_BLE_UN;
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break;
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case TOK_UGT:
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c = IL_OP_BGT_UN;
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break;
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case TOK_UGE:
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c = IL_OP_BGE_UN;
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break;
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}
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t = out_opj(c, t);
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} else if (v == VT_JMP || v == VT_JMPI) {
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/* && or || optimization */
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if ((v & 1) == inv) {
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/* insert vtop->c jump list in t */
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p = &vtop->c.i;
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while (*p != 0)
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p = (int *)*p;
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*p = t;
|
|
t = vtop->c.i;
|
|
} else {
|
|
t = gjmp(t);
|
|
gsym(vtop->c.i);
|
|
}
|
|
}
|
|
vtop--;
|
|
return t;
|
|
}
|
|
|
|
/* generate an integer binary operation */
|
|
void gen_opi(int op)
|
|
{
|
|
gv2(RC_ST1, RC_ST0);
|
|
switch(op) {
|
|
case '+':
|
|
out_op(IL_OP_ADD);
|
|
goto std_op;
|
|
case '-':
|
|
out_op(IL_OP_SUB);
|
|
goto std_op;
|
|
case '&':
|
|
out_op(IL_OP_AND);
|
|
goto std_op;
|
|
case '^':
|
|
out_op(IL_OP_XOR);
|
|
goto std_op;
|
|
case '|':
|
|
out_op(IL_OP_OR);
|
|
goto std_op;
|
|
case '*':
|
|
out_op(IL_OP_MUL);
|
|
goto std_op;
|
|
case TOK_SHL:
|
|
out_op(IL_OP_SHL);
|
|
goto std_op;
|
|
case TOK_SHR:
|
|
out_op(IL_OP_SHR_UN);
|
|
goto std_op;
|
|
case TOK_SAR:
|
|
out_op(IL_OP_SHR);
|
|
goto std_op;
|
|
case '/':
|
|
case TOK_PDIV:
|
|
out_op(IL_OP_DIV);
|
|
goto std_op;
|
|
case TOK_UDIV:
|
|
out_op(IL_OP_DIV_UN);
|
|
goto std_op;
|
|
case '%':
|
|
out_op(IL_OP_REM);
|
|
goto std_op;
|
|
case TOK_UMOD:
|
|
out_op(IL_OP_REM_UN);
|
|
std_op:
|
|
vtop--;
|
|
vtop[0].r = REG_ST0;
|
|
break;
|
|
case TOK_EQ:
|
|
case TOK_NE:
|
|
case TOK_LT:
|
|
case TOK_LE:
|
|
case TOK_GT:
|
|
case TOK_GE:
|
|
case TOK_ULT:
|
|
case TOK_ULE:
|
|
case TOK_UGT:
|
|
case TOK_UGE:
|
|
vtop--;
|
|
vtop[0].r = VT_CMP;
|
|
vtop[0].c.i = op;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* generate a floating point operation 'v = t1 op t2' instruction. The
|
|
two operands are guaranted to have the same floating point type */
|
|
void gen_opf(int op)
|
|
{
|
|
/* same as integer */
|
|
gen_opi(op);
|
|
}
|
|
|
|
/* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
|
|
and 'long long' cases. */
|
|
void gen_cvt_itof(int t)
|
|
{
|
|
gv(RC_ST0);
|
|
if (t == VT_FLOAT)
|
|
out_op(IL_OP_CONV_R4);
|
|
else
|
|
out_op(IL_OP_CONV_R8);
|
|
}
|
|
|
|
/* convert fp to int 't' type */
|
|
/* XXX: handle long long case */
|
|
void gen_cvt_ftoi(int t)
|
|
{
|
|
gv(RC_ST0);
|
|
switch(t) {
|
|
case VT_INT | VT_UNSIGNED:
|
|
out_op(IL_OP_CONV_U4);
|
|
break;
|
|
case VT_LLONG:
|
|
out_op(IL_OP_CONV_I8);
|
|
break;
|
|
case VT_LLONG | VT_UNSIGNED:
|
|
out_op(IL_OP_CONV_U8);
|
|
break;
|
|
default:
|
|
out_op(IL_OP_CONV_I4);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* convert from one floating point type to another */
|
|
void gen_cvt_ftof(int t)
|
|
{
|
|
gv(RC_ST0);
|
|
if (t == VT_FLOAT) {
|
|
out_op(IL_OP_CONV_R4);
|
|
} else {
|
|
out_op(IL_OP_CONV_R8);
|
|
}
|
|
}
|
|
|
|
/* end of CIL code generator */
|
|
/*************************************************************/
|
|
|