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5078a06e91
tinycc/il-gen.c
Thomas Preud'homme eda2c756ed Move logic for if (int value) to tccgen.c 
Move the logic to do a test of an integer value (ex if (0)) out of
arch-specific code to tccgen.c to avoid code duplication. This also
fixes test of long long value which was only testing the bottom half of
such values on 32 bits architectures.
2014-01-04 21:10:05 +08:00

655 lines
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C
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/*
* CIL code generator for TCC
*
* Copyright (c) 2002 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* number of available registers */
#define NB_REGS 3
/* a register can belong to several classes. The classes must be
sorted from more general to more precise (see gv2() code which does
assumptions on it). */
#define RC_ST 0x0001 /* any stack entry */
#define RC_ST0 0x0002 /* top of stack */
#define RC_ST1 0x0004 /* top - 1 */
#define RC_INT RC_ST
#define RC_FLOAT RC_ST
#define RC_IRET RC_ST0 /* function return: integer register */
#define RC_LRET RC_ST0 /* function return: second integer register */
#define RC_FRET RC_ST0 /* function return: float register */
/* pretty names for the registers */
enum {
REG_ST0 = 0,
REG_ST1,
REG_ST2,
};
const int reg_classes[NB_REGS] = {
/* ST0 */ RC_ST | RC_ST0,
/* ST1 */ RC_ST | RC_ST1,
/* ST2 */ RC_ST,
};
/* return registers for function */
#define REG_IRET REG_ST0 /* single word int return register */
#define REG_LRET REG_ST0 /* second word return register (for long long) */
#define REG_FRET REG_ST0 /* float return register */
/* defined if function parameters must be evaluated in reverse order */
/* #define INVERT_FUNC_PARAMS */
/* 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:
case VT_INT:
case VT_LONG:
tstr = "int32";
goto add_tstr;
case VT_LLONG:
tstr = "int64";
goto add_tstr;
case VT_FLOAT:
tstr = "float32";
goto add_tstr;
case VT_DOUBLE:
case VT_LDOUBLE:
tstr = "float64";
add_tstr:
pstrcat(buf, buf_size, tstr);
break;
case VT_STRUCT:
tcc_error("structures not handled yet");
break;
case VT_FUNC:
s = sym_find((unsigned)t >> VT_STRUCT_SHIFT);
il_type_to_str(buf, buf_size, s->t, varstr);
pstrcat(buf, buf_size, "(");
sa = s->next;
while (sa != NULL) {
il_type_to_str(buf1, sizeof(buf1), sa->t, NULL);
pstrcat(buf, buf_size, buf1);
sa = sa->next;
if (sa)
pstrcat(buf, buf_size, ", ");
}
pstrcat(buf, buf_size, ")");
goto no_var;
case VT_PTR:
s = sym_find((unsigned)t >> VT_STRUCT_SHIFT);
pstrcpy(buf1, sizeof(buf1), "*");
if (varstr)
pstrcat(buf1, sizeof(buf1), varstr);
il_type_to_str(buf, buf_size, s->t, buf1);
goto no_var;
}
if (varstr) {
pstrcat(buf, buf_size, " ");
pstrcat(buf, buf_size, varstr);
}
no_var: ;
}
/* patch relocation entry with value 'val' */
void greloc_patch1(Reloc *p, int val)
{
}
/* output a symbol and patch all calls to it */
void gsym_addr(t, a)
{
}
/* output jump and return symbol */
static int out_opj(int op, int c)
{
out_op1(op);
out_le32(0);
if (c == 0) {
c = ind - (int)cur_text_section->data;
}
fprintf(il_outfile, " %s L%d\n", il_opcodes_str[op], c);
return c;
}
void gsym(int t)
{
fprintf(il_outfile, "L%d:\n", t);
}
/* load 'r' from value 'sv' */
void load(int r, SValue *sv)
{
int v, fc, ft;
v = sv->r & VT_VALMASK;
fc = sv->c.i;
ft = sv->t;
if (sv->r & VT_LVAL) {
if (v == VT_LOCAL) {
if (fc >= ARG_BASE) {
fc -= ARG_BASE;
if (fc >= 0 && fc <= 4) {
out_op(IL_OP_LDARG_0 + fc);
} else if (fc <= 0xff) {
out_opb(IL_OP_LDARG_S, fc);
} else {
out_opi(IL_OP_LDARG, fc);
}
} else {
if (fc >= 0 && fc <= 4) {
out_op(IL_OP_LDLOC_0 + fc);
} else if (fc <= 0xff) {
out_opb(IL_OP_LDLOC_S, fc);
} else {
out_opi(IL_OP_LDLOC, fc);
}
}
} else if (v == VT_CONST) {
/* XXX: handle globals */
out_opi(IL_OP_LDSFLD, 0);
} else {
if ((ft & VT_BTYPE) == VT_FLOAT) {
out_op(IL_OP_LDIND_R4);
} else if ((ft & VT_BTYPE) == VT_DOUBLE) {
out_op(IL_OP_LDIND_R8);
} else if ((ft & VT_BTYPE) == VT_LDOUBLE) {
out_op(IL_OP_LDIND_R8);
} else if ((ft & VT_TYPE) == VT_BYTE)
out_op(IL_OP_LDIND_I1);
else if ((ft & VT_TYPE) == (VT_BYTE | VT_UNSIGNED))
out_op(IL_OP_LDIND_U1);
else if ((ft & VT_TYPE) == VT_SHORT)
out_op(IL_OP_LDIND_I2);
else if ((ft & VT_TYPE) == (VT_SHORT | VT_UNSIGNED))
out_op(IL_OP_LDIND_U2);
else
out_op(IL_OP_LDIND_I4);
}
} else {
if (v == VT_CONST) {
/* XXX: handle globals */
if (fc >= -1 && fc <= 8) {
out_op(IL_OP_LDC_I4_M1 + fc + 1);
} else {
out_opi(IL_OP_LDC_I4, fc);
}
} else if (v == VT_LOCAL) {
if (fc >= ARG_BASE) {
fc -= ARG_BASE;
if (fc <= 0xff) {
out_opb(IL_OP_LDARGA_S, fc);
} else {
out_opi(IL_OP_LDARGA, fc);
}
} else {
if (fc <= 0xff) {
out_opb(IL_OP_LDLOCA_S, fc);
} else {
out_opi(IL_OP_LDLOCA, fc);
}
}
} else {
/* XXX: do it */
}
}
}
/* store register 'r' in lvalue 'v' */
void store(int r, SValue *sv)
{
int v, fc, ft;
v = sv->r & VT_VALMASK;
fc = sv->c.i;
ft = sv->t;
if (v == VT_LOCAL) {
if (fc >= ARG_BASE) {
fc -= ARG_BASE;
/* XXX: check IL arg store semantics */
if (fc <= 0xff) {
out_opb(IL_OP_STARG_S, fc);
} else {
out_opi(IL_OP_STARG, fc);
}
} else {
if (fc >= 0 && fc <= 4) {
out_op(IL_OP_STLOC_0 + fc);
} else if (fc <= 0xff) {
out_opb(IL_OP_STLOC_S, fc);
} else {
out_opi(IL_OP_STLOC, fc);
}
}
} else if (v == VT_CONST) {
/* XXX: handle globals */
out_opi(IL_OP_STSFLD, 0);
} else {
if ((ft & VT_BTYPE) == VT_FLOAT)
out_op(IL_OP_STIND_R4);
else if ((ft & VT_BTYPE) == VT_DOUBLE)
out_op(IL_OP_STIND_R8);
else if ((ft & VT_BTYPE) == VT_LDOUBLE)
out_op(IL_OP_STIND_R8);
else if ((ft & VT_BTYPE) == VT_BYTE)
out_op(IL_OP_STIND_I1);
else if ((ft & VT_BTYPE) == VT_SHORT)
out_op(IL_OP_STIND_I2);
else
out_op(IL_OP_STIND_I4);
}
}
/* start function call and return function call context */
void gfunc_start(GFuncContext *c, int func_call)
{
c->func_call = func_call;
}
/* push function parameter which is in (vtop->t, vtop->c). Stack entry
is then popped. */
void gfunc_param(GFuncContext *c)
{
if ((vtop->t & VT_BTYPE) == VT_STRUCT) {
tcc_error("structures passed as value not handled yet");
} else {
/* simply push on stack */
gv(RC_ST0);
}
vtop--;
}
/* generate function call with address in (vtop->t, vtop->c) and free function
context. Stack entry is popped */
void gfunc_call(GFuncContext *c)
{
char buf[1024];
if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
/* XXX: more info needed from tcc */
il_type_to_str(buf, sizeof(buf), vtop->t, "xxx");
fprintf(il_outfile, " call %s\n", buf);
} else {
/* indirect call */
gv(RC_INT);
il_type_to_str(buf, sizeof(buf), vtop->t, NULL);
fprintf(il_outfile, " calli %s\n", buf);
}
vtop--;
}
/* generate function prolog of type 't' */
void gfunc_prolog(int t)
{
int addr, u, func_call;
Sym *sym;
char buf[1024];
init_outfile();
/* XXX: pass function name to gfunc_prolog */
il_type_to_str(buf, sizeof(buf), t, funcname);
fprintf(il_outfile, ".method static %s il managed\n", buf);
fprintf(il_outfile, "{\n");
/* XXX: cannot do better now */
fprintf(il_outfile, " .maxstack %d\n", NB_REGS);
fprintf(il_outfile, " .locals (int32, int32, int32, int32, int32, int32, int32, int32)\n");
if (!strcmp(funcname, "main"))
fprintf(il_outfile, " .entrypoint\n");
sym = sym_find((unsigned)t >> VT_STRUCT_SHIFT);
func_call = sym->r;
addr = ARG_BASE;
/* if the function returns a structure, then add an
implicit pointer parameter */
func_vt = sym->t;
if ((func_vt & VT_BTYPE) == VT_STRUCT) {
func_vc = addr;
addr++;
}
/* define parameters */
while ((sym = sym->next) != NULL) {
u = sym->t;
sym_push(sym->v & ~SYM_FIELD, u,
VT_LOCAL | lvalue_type(sym->type.t), addr);
addr++;
}
}
/* generate function epilog */
void gfunc_epilog(void)
{
out_op(IL_OP_RET);
fprintf(il_outfile, "}\n\n");
}
/* generate a jump to a label */
int gjmp(int t)
{
return out_opj(IL_OP_BR, t);
}
/* generate a jump to a fixed address */
void gjmp_addr(int a)
{
/* XXX: handle syms */
out_opi(IL_OP_BR, a);
}
/* generate a test. set 'inv' to invert test. Stack entry is popped */
int gtst(int inv, int t)
{
int v, *p, c;
v = vtop->r & VT_VALMASK;
if (v == VT_CMP) {
c = vtop->c.i ^ inv;
switch(c) {
case TOK_EQ:
c = IL_OP_BEQ;
break;
case TOK_NE:
c = IL_OP_BNE_UN;
break;
case TOK_LT:
c = IL_OP_BLT;
break;
case TOK_LE:
c = IL_OP_BLE;
break;
case TOK_GT:
c = IL_OP_BGT;
break;
case TOK_GE:
c = IL_OP_BGE;
break;
case TOK_ULT:
c = IL_OP_BLT_UN;
break;
case TOK_ULE:
c = IL_OP_BLE_UN;
break;
case TOK_UGT:
c = IL_OP_BGT_UN;
break;
case TOK_UGE:
c = IL_OP_BGE_UN;
break;
}
t = out_opj(c, t);
} else { /* VT_JMP || VT_JMPI */
/* && or || optimization */
if ((v & 1) == inv) {
/* insert vtop->c jump list in t */
p = &vtop->c.i;
while (*p != 0)
p = (int *)*p;
*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 */
/*************************************************************/
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