/** * This file implements the node emitter. * * $Id$ */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include "xmalloc.h" #include "tv.h" #include "iredges.h" #include "debug.h" #include "irgwalk.h" #include "irprintf.h" #include "irop_t.h" #include "irargs_t.h" #include "irprog_t.h" #include "iredges_t.h" #include "../besched_t.h" #include "../benode_t.h" #include "ia32_emitter.h" #include "gen_ia32_emitter.h" #include "gen_ia32_regalloc_if.h" #include "ia32_nodes_attr.h" #include "ia32_new_nodes.h" #include "ia32_map_regs.h" #include "bearch_ia32_t.h" #define BLOCK_PREFIX(x) ".L" x #define SNPRINTF_BUF_LEN 128 /* global arch_env for lc_printf functions */ static const arch_env_t *arch_env = NULL; /** by default, we generate assembler code for the Linux gas */ asm_flavour_t asm_flavour = ASM_LINUX_GAS; /** * Switch to a new section */ void ia32_switch_section(FILE *F, section_t sec) { static section_t curr_sec = NO_SECTION; static const char *text[ASM_MAX][SECTION_MAX] = { { ".section\t.text", ".section\t.data", ".section\t.rodata", ".section\t.text" }, { ".section\t.text", ".section\t.data", ".section .rdata,\"dr\"", ".section\t.text" } }; if (curr_sec == sec) return; curr_sec = sec; switch (sec) { case NO_SECTION: break; case SECTION_TEXT: case SECTION_DATA: case SECTION_RODATA: case SECTION_COMMON: fprintf(F, "\t%s\n", text[asm_flavour][sec]); } } static void ia32_dump_function_object(FILE *F, const char *name) { switch (asm_flavour) { case ASM_LINUX_GAS: fprintf(F, "\t.type\t%s, @function\n", name); break; case ASM_MINGW_GAS: fprintf(F, "\t.def\t%s;\t.scl\t2;\t.type\t32;\t.endef\n", name); break; } } static void ia32_dump_function_size(FILE *F, const char *name) { switch (asm_flavour) { case ASM_LINUX_GAS: fprintf(F, "\t.size\t%s, .-%s\n", name, name); break; } } /************************************************************* * _ _ __ _ _ * (_) | | / _| | | | | * _ __ _ __ _ _ __ | |_| |_ | |__ ___| |_ __ ___ _ __ * | '_ \| '__| | '_ \| __| _| | '_ \ / _ \ | '_ \ / _ \ '__| * | |_) | | | | | | | |_| | | | | | __/ | |_) | __/ | * | .__/|_| |_|_| |_|\__|_| |_| |_|\___|_| .__/ \___|_| * | | | | * |_| |_| *************************************************************/ /** * returns true if a node has x87 registers */ static int has_x87_register(const ir_node *n) { return is_irn_machine_user(n, 0); } /* We always pass the ir_node which is a pointer. */ static int ia32_get_arg_type(const lc_arg_occ_t *occ) { return lc_arg_type_ptr; } /** * Returns the register at in position pos. */ static const arch_register_t *get_in_reg(const ir_node *irn, int pos) { ir_node *op; const arch_register_t *reg = NULL; assert(get_irn_arity(irn) > pos && "Invalid IN position"); /* The out register of the operator at position pos is the in register we need. */ op = get_irn_n(irn, pos); reg = arch_get_irn_register(arch_env, op); assert(reg && "no in register found"); /* in case of unknown: just return a register */ if (REGS_ARE_EQUAL(reg, &ia32_gp_regs[REG_GP_UKNWN])) reg = &ia32_gp_regs[REG_EAX]; else if (REGS_ARE_EQUAL(reg, &ia32_xmm_regs[REG_XMM_UKNWN])) reg = &ia32_xmm_regs[REG_XMM0]; else if (REGS_ARE_EQUAL(reg, &ia32_vfp_regs[REG_VFP_UKNWN])) reg = &ia32_vfp_regs[REG_VF0]; else if (REGS_ARE_EQUAL(reg, &ia32_st_regs[REG_ST_UKNWN])) reg = &ia32_st_regs[REG_ST0]; return reg; } /** * Returns the register at out position pos. */ static const arch_register_t *get_out_reg(const ir_node *irn, int pos) { ir_node *proj; const arch_register_t *reg = NULL; /* 1st case: irn is not of mode_T, so it has only */ /* one OUT register -> good */ /* 2nd case: irn is of mode_T -> collect all Projs and ask the */ /* Proj with the corresponding projnum for the register */ if (get_irn_mode(irn) != mode_T) { reg = arch_get_irn_register(arch_env, irn); } else if (is_ia32_irn(irn)) { reg = get_ia32_out_reg(irn, pos); } else { const ir_edge_t *edge; foreach_out_edge(irn, edge) { proj = get_edge_src_irn(edge); assert(is_Proj(proj) && "non-Proj from mode_T node"); if (get_Proj_proj(proj) == pos) { reg = arch_get_irn_register(arch_env, proj); break; } } } assert(reg && "no out register found"); return reg; } enum io_direction { IN_REG, OUT_REG }; /** * Returns the name of the in register at position pos. */ static const char *get_ia32_reg_name(ir_node *irn, int pos, enum io_direction in_out) { const arch_register_t *reg; if (in_out == IN_REG) { reg = get_in_reg(irn, pos); if (reg->reg_class == &ia32_reg_classes[CLASS_ia32_vfp]) { /* FIXME: works for binop only */ assert(2 <= pos && pos <= 3); reg = get_ia32_attr(irn)->x87[pos - 2]; } } else { /* destination address mode nodes don't have outputs */ if (is_ia32_irn(irn) && get_ia32_op_type(irn) == ia32_AddrModeD) { return "MEM"; } reg = get_out_reg(irn, pos); if (reg->reg_class == &ia32_reg_classes[CLASS_ia32_vfp]) reg = get_ia32_attr(irn)->x87[pos + 2]; } return arch_register_get_name(reg); } /** * Get the register name for a node. */ static int ia32_get_reg_name(lc_appendable_t *app, const lc_arg_occ_t *occ, const lc_arg_value_t *arg) { const char *buf; ir_node *X = arg->v_ptr; int nr = occ->width - 1; if (!X) return lc_appendable_snadd(app, "(null)", 6); buf = get_ia32_reg_name(X, nr, occ->conversion == 'S' ? IN_REG : OUT_REG); /* append the stupid % to register names */ lc_appendable_chadd(app, '%'); return lc_appendable_snadd(app, buf, strlen(buf)); } /** * Get the x87 register name for a node. */ static int ia32_get_x87_name(lc_appendable_t *app, const lc_arg_occ_t *occ, const lc_arg_value_t *arg) { const char *buf; ir_node *X = arg->v_ptr; int nr = occ->width - 1; ia32_attr_t *attr; if (!X) return lc_appendable_snadd(app, "(null)", 6); attr = get_ia32_attr(X); buf = attr->x87[nr]->name; lc_appendable_chadd(app, '%'); return lc_appendable_snadd(app, buf, strlen(buf)); } /** * Returns the tarval, offset or scale of an ia32 as a string. */ static int ia32_const_to_str(lc_appendable_t *app, const lc_arg_occ_t *occ, const lc_arg_value_t *arg) { const char *buf; ir_node *X = arg->v_ptr; if (!X) return lc_arg_append(app, occ, "(null)", 6); if (occ->conversion == 'C') { buf = get_ia32_cnst(X); } else { /* 'O' */ buf = get_ia32_am_offs(X); } return buf ? lc_appendable_snadd(app, buf, strlen(buf)) : 0; } /** * Determines the SSE suffix depending on the mode. */ static int ia32_get_mode_suffix(lc_appendable_t *app, const lc_arg_occ_t *occ, const lc_arg_value_t *arg) { ir_node *X = arg->v_ptr; ir_mode *mode = get_irn_mode(X); if (mode == mode_T) { mode = (is_ia32_Ld(X) || is_ia32_St(X)) ? get_ia32_ls_mode(X) : get_ia32_res_mode(X); } if (!X) return lc_arg_append(app, occ, "(null)", 6); if (mode_is_float(mode)) { return lc_appendable_chadd(app, get_mode_size_bits(mode) == 32 ? 's' : 'd'); } else { return lc_appendable_chadd(app, mode_is_signed(mode) ? 's' : 'z'); } } /** * Return the ia32 printf arg environment. * We use the firm environment with some additional handlers. */ const lc_arg_env_t *ia32_get_arg_env(void) { static lc_arg_env_t *env = NULL; static const lc_arg_handler_t ia32_reg_handler = { ia32_get_arg_type, ia32_get_reg_name }; static const lc_arg_handler_t ia32_const_handler = { ia32_get_arg_type, ia32_const_to_str }; static const lc_arg_handler_t ia32_mode_handler = { ia32_get_arg_type, ia32_get_mode_suffix }; static const lc_arg_handler_t ia32_x87_handler = { ia32_get_arg_type, ia32_get_x87_name }; if(env == NULL) { /* extend the firm printer */ env = firm_get_arg_env(); lc_arg_register(env, "ia32:sreg", 'S', &ia32_reg_handler); lc_arg_register(env, "ia32:dreg", 'D', &ia32_reg_handler); lc_arg_register(env, "ia32:cnst", 'C', &ia32_const_handler); lc_arg_register(env, "ia32:offs", 'O', &ia32_const_handler); lc_arg_register(env, "ia32:mode", 'M', &ia32_mode_handler); lc_arg_register(env, "ia32:x87", 'X', &ia32_x87_handler); } return env; } static char *ia32_get_reg_name_for_mode(ia32_emit_env_t *env, ir_mode *mode, const arch_register_t *reg) { switch(get_mode_size_bits(mode)) { case 8: return ia32_get_mapped_reg_name(env->isa->regs_8bit, reg); case 16: return ia32_get_mapped_reg_name(env->isa->regs_16bit, reg); default: return (char *)arch_register_get_name(reg); } } /** * Emits registers and/or address mode of a binary operation. */ char *ia32_emit_binop(const ir_node *n, ia32_emit_env_t *env) { static char *buf = NULL; /* verify that this function is never called on non-AM supporting operations */ //assert(get_ia32_am_support(n) != ia32_am_None && "emit binop expects addressmode support"); #define PRODUCES_RESULT(n) \ (!(is_ia32_St(n) || \ is_ia32_Store8Bit(n) || \ is_ia32_CondJmp(n) || \ is_ia32_xCondJmp(n) || \ is_ia32_SwitchJmp(n))) if (! buf) { buf = xcalloc(1, SNPRINTF_BUF_LEN); } else { memset(buf, 0, SNPRINTF_BUF_LEN); } switch(get_ia32_op_type(n)) { case ia32_Normal: if (is_ia32_ImmConst(n) || is_ia32_ImmSymConst(n)) { lc_esnprintf(ia32_get_arg_env(), buf, SNPRINTF_BUF_LEN, "%3S, %s", n, get_ia32_cnst(n)); } else { const arch_register_t *in1 = get_in_reg(n, 2); const arch_register_t *in2 = get_in_reg(n, 3); const arch_register_t *out = PRODUCES_RESULT(n) ? get_out_reg(n, 0) : NULL; const arch_register_t *in; const char *in_name; in = out ? (REGS_ARE_EQUAL(out, in2) ? in1 : in2) : in2; out = out ? out : in1; in_name = arch_register_get_name(in); if (is_ia32_emit_cl(n)) { assert(REGS_ARE_EQUAL(&ia32_gp_regs[REG_ECX], in) && "shift operation needs ecx"); in_name = "cl"; } snprintf(buf, SNPRINTF_BUF_LEN, "%%%s, %%%s", arch_register_get_name(out), in_name); } break; case ia32_AddrModeS: if (is_ia32_ImmConst(n) || is_ia32_ImmSymConst(n)) { assert(! PRODUCES_RESULT(n) && "Source AM with Const must not produce result"); snprintf(buf, SNPRINTF_BUF_LEN, "%s, %s", get_ia32_cnst(n), ia32_emit_am(n, env)); } else { if (PRODUCES_RESULT(n)) { lc_esnprintf(ia32_get_arg_env(), buf, SNPRINTF_BUF_LEN, "%1D, %s", n, ia32_emit_am(n, env)); } else { lc_esnprintf(ia32_get_arg_env(), buf, SNPRINTF_BUF_LEN, "%3S, %s", n, ia32_emit_am(n, env)); } } break; case ia32_AddrModeD: if (is_ia32_ImmConst(n) || is_ia32_ImmSymConst(n)) { lc_esnprintf(ia32_get_arg_env(), buf, SNPRINTF_BUF_LEN, "%s,%s%s", ia32_emit_am(n, env), is_ia32_ImmSymConst(n) ? " OFFSET FLAT:" : " ", /* In case of a symconst we must add OFFSET to */ get_ia32_cnst(n)); /* tell the assembler to store it's address. */ } else { const arch_register_t *in1 = get_in_reg(n, 2); ir_mode *mode = get_ia32_res_mode(n); const char *in_name; mode = mode ? mode : get_ia32_ls_mode(n); in_name = ia32_get_reg_name_for_mode(env, mode, in1); if (is_ia32_emit_cl(n)) { assert(REGS_ARE_EQUAL(&ia32_gp_regs[REG_ECX], in1) && "shift operation needs ecx"); in_name = "cl"; } lc_esnprintf(ia32_get_arg_env(), buf, SNPRINTF_BUF_LEN, "%s, %%%s", ia32_emit_am(n, env), in_name); } break; default: assert(0 && "unsupported op type"); } #undef PRODUCES_RESULT return buf; } /** * Emits registers and/or address mode of a binary operation. */ char *ia32_emit_x87_binop(const ir_node *n, ia32_emit_env_t *env) { static char *buf = NULL; /* verify that this function is never called on non-AM supporting operations */ //assert(get_ia32_am_support(n) != ia32_am_None && "emit binop expects addressmode support"); if (! buf) { buf = xcalloc(1, SNPRINTF_BUF_LEN); } else { memset(buf, 0, SNPRINTF_BUF_LEN); } switch(get_ia32_op_type(n)) { case ia32_Normal: if (is_ia32_ImmConst(n) || is_ia32_ImmSymConst(n)) { lc_esnprintf(ia32_get_arg_env(), buf, SNPRINTF_BUF_LEN, "%3S, %s", n, get_ia32_cnst(n)); } else { ia32_attr_t *attr = get_ia32_attr(n); const arch_register_t *in1 = attr->x87[0]; const arch_register_t *in2 = attr->x87[1]; const arch_register_t *out = attr->x87[2]; const arch_register_t *in; const char *in_name; in = out ? (REGS_ARE_EQUAL(out, in2) ? in1 : in2) : in2; out = out ? out : in1; in_name = arch_register_get_name(in); snprintf(buf, SNPRINTF_BUF_LEN, "%%%s, %%%s", arch_register_get_name(out), in_name); } break; case ia32_AddrModeS: case ia32_AddrModeD: lc_esnprintf(ia32_get_arg_env(), buf, SNPRINTF_BUF_LEN, "%s", ia32_emit_am(n, env)); break; default: assert(0 && "unsupported op type"); } #undef PRODUCES_RESULT return buf; } /** * Emits registers and/or address mode of a unary operation. */ char *ia32_emit_unop(const ir_node *n, ia32_emit_env_t *env) { static char *buf = NULL; if (! buf) { buf = xcalloc(1, SNPRINTF_BUF_LEN); } else { memset(buf, 0, SNPRINTF_BUF_LEN); } switch(get_ia32_op_type(n)) { case ia32_Normal: if (is_ia32_ImmConst(n) || is_ia32_ImmSymConst(n)) { lc_esnprintf(ia32_get_arg_env(), buf, SNPRINTF_BUF_LEN, "%C", n); } else { lc_esnprintf(ia32_get_arg_env(), buf, SNPRINTF_BUF_LEN, "%1D", n); } break; case ia32_AddrModeD: snprintf(buf, SNPRINTF_BUF_LEN, "%s", ia32_emit_am(n, env)); break; default: assert(0 && "unsupported op type"); } return buf; } /** * Emits address mode. */ char *ia32_emit_am(const ir_node *n, ia32_emit_env_t *env) { ia32_am_flavour_t am_flav = get_ia32_am_flavour(n); int had_output = 0; char *s; int size; static struct obstack *obst = NULL; ir_mode *mode = get_ia32_ls_mode(n); if (! is_ia32_Lea(n)) assert(mode && "AM node must have ls_mode attribute set."); if (! obst) { obst = xcalloc(1, sizeof(*obst)); } else { obstack_free(obst, NULL); } /* obstack_free with NULL results in an uninitialized obstack */ obstack_init(obst); if (mode) { switch (get_mode_size_bits(mode)) { case 8: obstack_printf(obst, "BYTE PTR "); break; case 16: obstack_printf(obst, "WORD PTR "); break; case 32: obstack_printf(obst, "DWORD PTR "); break; case 64: if (has_x87_register(n)) /* ARGHHH: stupid gas x87 wants QWORD PTR but SSE must be WITHOUT */ obstack_printf(obst, "QWORD PTR "); break; case 80: case 96: obstack_printf(obst, "XWORD PTR "); break; default: break; } } /* emit address mode symconst */ if (get_ia32_am_sc(n)) { if (is_ia32_am_sc_sign(n)) obstack_printf(obst, "-"); obstack_printf(obst, "%s", get_id_str(get_ia32_am_sc(n))); } if (am_flav & ia32_B) { obstack_printf(obst, "["); lc_eoprintf(ia32_get_arg_env(), obst, "%1S", n); had_output = 1; } if (am_flav & ia32_I) { if (had_output) { obstack_printf(obst, "+"); } else { obstack_printf(obst, "["); } lc_eoprintf(ia32_get_arg_env(), obst, "%2S", n); if (am_flav & ia32_S) { obstack_printf(obst, "*%d", 1 << get_ia32_am_scale(n)); } had_output = 1; } if (am_flav & ia32_O) { s = get_ia32_am_offs(n); if (s) { /* omit explicit + if there was no base or index */ if (! had_output) { obstack_printf(obst, "["); if (s[0] == '+') s++; } obstack_printf(obst, s); had_output = 1; } } if (had_output) obstack_printf(obst, "] "); size = obstack_object_size(obst); s = obstack_finish(obst); s[size - 1] = '\0'; return s; } /** * Formated print of commands and comments. */ static void ia32_fprintf_format(FILE *F, const ir_node *irn, char *cmd_buf, char *cmnt_buf) { unsigned lineno; const char *name = irn ? be_retrieve_dbg_info(get_irn_dbg_info((ir_node *)irn), &lineno) : NULL; if (name) fprintf(F, "\t%-35s %-60s /* %s:%u */\n", cmd_buf, cmnt_buf, name, lineno); else fprintf(F, "\t%-35s %-60s\n", cmd_buf, cmnt_buf); } /** * Add a number to a prefix. This number will not be used a second time. */ static char *get_unique_label(char *buf, size_t buflen, const char *prefix) { static unsigned long id = 0; snprintf(buf, buflen, "%s%lu", prefix, ++id); return buf; } /************************************************* * _ _ _ * (_) | | | * ___ _ __ ___ _| |_ ___ ___ _ __ __| | * / _ \ '_ ` _ \| | __| / __/ _ \| '_ \ / _` | * | __/ | | | | | | |_ | (_| (_) | | | | (_| | * \___|_| |_| |_|_|\__| \___\___/|_| |_|\__,_| * *************************************************/ #undef IA32_DO_EMIT #define IA32_DO_EMIT(irn) ia32_fprintf_format(F, irn, cmd_buf, cmnt_buf) /* * coding of conditions */ struct cmp2conditon_t { const char *name; pn_Cmp num; }; /* * positive conditions for signed compares */ static const struct cmp2conditon_t cmp2condition_s[] = { { NULL, pn_Cmp_False }, /* always false */ { "e", pn_Cmp_Eq }, /* == */ { "l", pn_Cmp_Lt }, /* < */ { "le", pn_Cmp_Le }, /* <= */ { "g", pn_Cmp_Gt }, /* > */ { "ge", pn_Cmp_Ge }, /* >= */ { "ne", pn_Cmp_Lg }, /* != */ { "ordered", pn_Cmp_Leg }, /* Floating point: ordered */ { "unordered", pn_Cmp_Uo }, /* FLoting point: unordered */ { "unordered or ==", pn_Cmp_Ue }, /* Floating point: unordered or == */ { "unordered or <", pn_Cmp_Ul }, /* Floating point: unordered or < */ { "unordered or <=", pn_Cmp_Ule }, /* Floating point: unordered or <= */ { "unordered or >", pn_Cmp_Ug }, /* Floating point: unordered or > */ { "unordered or >=", pn_Cmp_Uge }, /* Floating point: unordered or >= */ { "unordered or !=", pn_Cmp_Ne }, /* Floating point: unordered or != */ { NULL, pn_Cmp_True }, /* always true */ }; /* * positive conditions for unsigned compares */ static const struct cmp2conditon_t cmp2condition_u[] = { { NULL, pn_Cmp_False }, /* always false */ { "e", pn_Cmp_Eq }, /* == */ { "b", pn_Cmp_Lt }, /* < */ { "be", pn_Cmp_Le }, /* <= */ { "a", pn_Cmp_Gt }, /* > */ { "ae", pn_Cmp_Ge }, /* >= */ { "ne", pn_Cmp_Lg }, /* != */ { "ordered", pn_Cmp_Leg }, /* Floating point: ordered */ { "unordered", pn_Cmp_Uo }, /* FLoting point: unordered */ { "unordered or ==", pn_Cmp_Ue }, /* Floating point: unordered or == */ { "unordered or <", pn_Cmp_Ul }, /* Floating point: unordered or < */ { "unordered or <=", pn_Cmp_Ule }, /* Floating point: unordered or <= */ { "unordered or >", pn_Cmp_Ug }, /* Floating point: unordered or > */ { "unordered or >=", pn_Cmp_Uge }, /* Floating point: unordered or >= */ { "unordered or !=", pn_Cmp_Ne }, /* Floating point: unordered or != */ { NULL, pn_Cmp_True }, /* always true */ }; /* * returns the condition code */ static const char *get_cmp_suffix(int cmp_code, int unsigned_cmp) { assert(cmp2condition_s[cmp_code].num == cmp_code); assert(cmp2condition_u[cmp_code].num == cmp_code); return unsigned_cmp ? cmp2condition_u[cmp_code & 7].name : cmp2condition_s[cmp_code & 7].name; } /** * Returns the target block for a control flow node. */ static ir_node *get_cfop_target_block(const ir_node *irn) { return get_irn_link(irn); } /** * Returns the target label for a control flow node. */ static char *get_cfop_target(const ir_node *irn, char *buf) { ir_node *bl = get_cfop_target_block(irn); snprintf(buf, SNPRINTF_BUF_LEN, BLOCK_PREFIX("%ld"), get_irn_node_nr(bl)); return buf; } /** Return the next block in Block schedule */ static ir_node *next_blk_sched(const ir_node *block) { return get_irn_link(block); } /** * Emits the jump sequence for a conditional jump (cmp + jmp_true + jmp_false) */ static void finish_CondJmp(FILE *F, const ir_node *irn, ir_mode *mode) { const ir_node *proj1, *proj2 = NULL; const ir_node *block, *next_bl = NULL; const ir_edge_t *edge; char buf[SNPRINTF_BUF_LEN]; char cmd_buf[SNPRINTF_BUF_LEN]; char cmnt_buf[SNPRINTF_BUF_LEN]; /* get both Proj's */ edge = get_irn_out_edge_first(irn); proj1 = get_edge_src_irn(edge); assert(is_Proj(proj1) && "CondJmp with a non-Proj"); edge = get_irn_out_edge_next(irn, edge); if (edge) { proj2 = get_edge_src_irn(edge); assert(is_Proj(proj2) && "CondJmp with a non-Proj"); } /* for now, the code works for scheduled and non-schedules blocks */ block = get_nodes_block(irn); if (proj2) { /* we have a block schedule */ next_bl = next_blk_sched(block); if (get_cfop_target_block(proj1) == next_bl) { /* exchange both proj's so the second one can be omitted */ const ir_node *t = proj1; proj1 = proj2; proj2 = t; } } /* the first Proj must always be created */ if (get_Proj_proj(proj1) == pn_Cond_true) { snprintf(cmd_buf, SNPRINTF_BUF_LEN, "j%s %s", get_cmp_suffix(get_ia32_pncode(irn), !mode_is_signed(get_irn_mode(get_irn_n(irn, 0)))), get_cfop_target(proj1, buf)); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* cmp(a, b) == TRUE */"); } else { snprintf(cmd_buf, SNPRINTF_BUF_LEN, "j%s %s", get_cmp_suffix(get_negated_pnc(get_ia32_pncode(irn), mode), !mode_is_signed(get_irn_mode(get_irn_n(irn, 0)))), get_cfop_target(proj1, buf)); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* cmp(a, b) == FALSE */"); } IA32_DO_EMIT(irn); /* the second Proj might be a fallthrough */ if (proj2) { if (get_cfop_target_block(proj2) != next_bl) { snprintf(cmd_buf, SNPRINTF_BUF_LEN, "jmp %s", get_cfop_target(proj2, buf)); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* otherwise */"); } else { cmd_buf[0] = '\0'; snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* fallthrogh %s */", get_cfop_target(proj2, buf)); } IA32_DO_EMIT(irn); } } /** * Emits code for conditional jump. */ static void CondJmp_emitter(const ir_node *irn, ia32_emit_env_t *env) { FILE *F = env->out; char cmd_buf[SNPRINTF_BUF_LEN]; char cmnt_buf[SNPRINTF_BUF_LEN]; snprintf(cmd_buf, SNPRINTF_BUF_LEN, "cmp %s", ia32_emit_binop(irn, env)); lc_esnprintf(ia32_get_arg_env(), cmnt_buf, SNPRINTF_BUF_LEN, "/* %+F */", irn); IA32_DO_EMIT(irn); finish_CondJmp(F, irn, get_ia32_res_mode(irn)); } /** * Emits code for conditional jump with two variables. */ static void emit_ia32_CondJmp(const ir_node *irn, ia32_emit_env_t *env) { CondJmp_emitter(irn, env); } /** * Emits code for conditional test and jump. */ static void TestJmp_emitter(const ir_node *irn, ia32_emit_env_t *env) { #define IA32_IS_IMMOP (is_ia32_ImmConst(irn) || is_ia32_ImmSymConst(irn)) FILE *F = env->out; const char *op1 = arch_register_get_name(get_in_reg(irn, 0)); const char *op2 = IA32_IS_IMMOP ? get_ia32_cnst(irn) : NULL; char cmd_buf[SNPRINTF_BUF_LEN]; char cmnt_buf[SNPRINTF_BUF_LEN]; if (! op2) op2 = arch_register_get_name(get_in_reg(irn, 1)); snprintf(cmd_buf, SNPRINTF_BUF_LEN, "test %%%s,%s%s ", op1, IA32_IS_IMMOP ? " " : " %", op2); lc_esnprintf(ia32_get_arg_env(), cmnt_buf, SNPRINTF_BUF_LEN, "/* %+F */", irn); IA32_DO_EMIT(irn); finish_CondJmp(F, irn, get_ia32_res_mode(irn)); #undef IA32_IS_IMMOP } /** * Emits code for conditional test and jump with two variables. */ static void emit_ia32_TestJmp(const ir_node *irn, ia32_emit_env_t *env) { TestJmp_emitter(irn, env); } static void emit_ia32_CJmp(const ir_node *irn, ia32_emit_env_t *env) { FILE *F = env->out; char cmd_buf[SNPRINTF_BUF_LEN]; char cmnt_buf[SNPRINTF_BUF_LEN]; snprintf(cmd_buf, SNPRINTF_BUF_LEN, " "); lc_esnprintf(ia32_get_arg_env(), cmnt_buf, SNPRINTF_BUF_LEN, "/* %+F omitted redundant test */", irn); IA32_DO_EMIT(irn); finish_CondJmp(F, irn, get_ia32_res_mode(irn)); } static void emit_ia32_CJmpAM(const ir_node *irn, ia32_emit_env_t *env) { FILE *F = env->out; char cmd_buf[SNPRINTF_BUF_LEN]; char cmnt_buf[SNPRINTF_BUF_LEN]; snprintf(cmd_buf, SNPRINTF_BUF_LEN, " "); lc_esnprintf(ia32_get_arg_env(), cmnt_buf, SNPRINTF_BUF_LEN, "/* %+F omitted redundant test/cmp */", irn); IA32_DO_EMIT(irn); finish_CondJmp(F, irn, get_ia32_res_mode(irn)); } /** * Emits code for conditional x87 floating point jump with two variables. */ static void emit_ia32_x87CondJmp(ir_node *irn, ia32_emit_env_t *env) { FILE *F = env->out; char cmd_buf[SNPRINTF_BUF_LEN]; char cmnt_buf[SNPRINTF_BUF_LEN]; ia32_attr_t *attr = get_ia32_attr(irn); const char *reg = attr->x87[1]->name; const char *instr = "fcom"; int reverse = 0; switch (get_ia32_pncode(irn)) { case iro_ia32_fcomrJmp: reverse = 1; case iro_ia32_fcomJmp: default: instr = "fucom"; break; case iro_ia32_fcomrpJmp: reverse = 1; case iro_ia32_fcompJmp: instr = "fucomp"; break; case iro_ia32_fcomrppJmp: reverse = 1; case iro_ia32_fcomppJmp: instr = "fucompp"; reg = ""; break; } if (reverse) set_ia32_pncode(irn, (long)get_negated_pnc(get_ia32_pncode(irn), mode_Is)); snprintf(cmd_buf, SNPRINTF_BUF_LEN, "%s %s", instr, reg); lc_esnprintf(ia32_get_arg_env(), cmnt_buf, SNPRINTF_BUF_LEN, "/* %+F */", irn); IA32_DO_EMIT(irn); // lc_esnprintf(ia32_get_arg_env(), cmd_buf, SNPRINTF_BUF_LEN, "fnstsw %3D", irn); lc_esnprintf(ia32_get_arg_env(), cmd_buf, SNPRINTF_BUF_LEN, "fnstsw %%ax", irn); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* Store x87 FPU Control Word */"); IA32_DO_EMIT(irn); snprintf(cmd_buf, SNPRINTF_BUF_LEN, "sahf"); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* Store ah into flags */"); IA32_DO_EMIT(irn); finish_CondJmp(F, irn, mode_Is); } /********************************************************* * _ _ _ * (_) | (_) * ___ _ __ ___ _| |_ _ _ _ _ __ ___ _ __ ___ * / _ \ '_ ` _ \| | __| | | | | | '_ ` _ \| '_ \/ __| * | __/ | | | | | | |_ | | |_| | | | | | | |_) \__ \ * \___|_| |_| |_|_|\__| | |\__,_|_| |_| |_| .__/|___/ * _/ | | | * |__/ |_| *********************************************************/ /* jump table entry (target and corresponding number) */ typedef struct _branch_t { ir_node *target; int value; } branch_t; /* jump table for switch generation */ typedef struct _jmp_tbl_t { ir_node *defProj; /**< default target */ int min_value; /**< smallest switch case */ int max_value; /**< largest switch case */ int num_branches; /**< number of jumps */ char *label; /**< label of the jump table */ branch_t *branches; /**< jump array */ } jmp_tbl_t; /** * Compare two variables of type branch_t. Used to sort all switch cases */ static int ia32_cmp_branch_t(const void *a, const void *b) { branch_t *b1 = (branch_t *)a; branch_t *b2 = (branch_t *)b; if (b1->value <= b2->value) return -1; else return 1; } /** * Emits code for a SwitchJmp (creates a jump table if * possible otherwise a cmp-jmp cascade). Port from * cggg ia32 backend */ static void emit_ia32_SwitchJmp(const ir_node *irn, ia32_emit_env_t *emit_env) { unsigned long interval; char buf[SNPRINTF_BUF_LEN]; int last_value, i, pn; jmp_tbl_t tbl; ir_node *proj; const ir_edge_t *edge; const lc_arg_env_t *env = ia32_get_arg_env(); FILE *F = emit_env->out; char cmd_buf[SNPRINTF_BUF_LEN], cmnt_buf[SNPRINTF_BUF_LEN]; /* fill the table structure */ tbl.label = xmalloc(SNPRINTF_BUF_LEN); tbl.label = get_unique_label(tbl.label, SNPRINTF_BUF_LEN, "JMPTBL_"); tbl.defProj = NULL; tbl.num_branches = get_irn_n_edges(irn); tbl.branches = xcalloc(tbl.num_branches, sizeof(tbl.branches[0])); tbl.min_value = INT_MAX; tbl.max_value = INT_MIN; i = 0; /* go over all proj's and collect them */ foreach_out_edge(irn, edge) { proj = get_edge_src_irn(edge); assert(is_Proj(proj) && "Only proj allowed at SwitchJmp"); pn = get_Proj_proj(proj); /* create branch entry */ tbl.branches[i].target = proj; tbl.branches[i].value = pn; tbl.min_value = pn < tbl.min_value ? pn : tbl.min_value; tbl.max_value = pn > tbl.max_value ? pn : tbl.max_value; /* check for default proj */ if (pn == get_ia32_pncode(irn)) { assert(tbl.defProj == NULL && "found two defProjs at SwitchJmp"); tbl.defProj = proj; } i++; } /* sort the branches by their number */ qsort(tbl.branches, tbl.num_branches, sizeof(tbl.branches[0]), ia32_cmp_branch_t); /* two-complement's magic make this work without overflow */ interval = tbl.max_value - tbl.min_value; /* emit the table */ lc_esnprintf(env, cmd_buf, SNPRINTF_BUF_LEN, "cmp %1S, %u", irn, interval); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* compare for switch */"); IA32_DO_EMIT(irn); snprintf(cmd_buf, SNPRINTF_BUF_LEN, "ja %s", get_cfop_target(tbl.defProj, buf)); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* default jump if out of range */"); IA32_DO_EMIT(irn); if (tbl.num_branches > 1) { /* create table */ lc_esnprintf(env, cmd_buf, SNPRINTF_BUF_LEN, "jmp %s[%1S*4]", tbl.label, irn); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* get jump table entry as target */"); IA32_DO_EMIT(irn); ia32_switch_section(F, SECTION_RODATA); fprintf(F, "\t.align 4\n"); fprintf(F, "%s:\n", tbl.label); snprintf(cmd_buf, SNPRINTF_BUF_LEN, ".long %s", get_cfop_target(tbl.branches[0].target, buf)); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* case %d */", tbl.branches[0].value); IA32_DO_EMIT(irn); last_value = tbl.branches[0].value; for (i = 1; i < tbl.num_branches; ++i) { while (++last_value < tbl.branches[i].value) { snprintf(cmd_buf, SNPRINTF_BUF_LEN, ".long %s", get_cfop_target(tbl.defProj, buf)); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* default case */"); IA32_DO_EMIT(irn); } snprintf(cmd_buf, SNPRINTF_BUF_LEN, ".long %s", get_cfop_target(tbl.branches[i].target, buf)); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* case %d */", last_value); IA32_DO_EMIT(irn); } ia32_switch_section(F, SECTION_TEXT); } else { /* one jump is enough */ snprintf(cmd_buf, SNPRINTF_BUF_LEN, "jmp %s", get_cfop_target(tbl.branches[0].target, buf)); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* only one case given */"); IA32_DO_EMIT(irn); } if (tbl.label) free(tbl.label); if (tbl.branches) free(tbl.branches); } /** * Emits code for a unconditional jump. */ static void emit_Jmp(const ir_node *irn, ia32_emit_env_t *env) { ir_node *block, *next_bl; FILE *F = env->out; char buf[SNPRINTF_BUF_LEN], cmd_buf[SNPRINTF_BUF_LEN], cmnt_buf[SNPRINTF_BUF_LEN]; /* for now, the code works for scheduled and non-schedules blocks */ block = get_nodes_block(irn); /* we have a block schedule */ next_bl = next_blk_sched(block); if (get_cfop_target_block(irn) != next_bl) { snprintf(cmd_buf, SNPRINTF_BUF_LEN, "jmp %s", get_cfop_target(irn, buf)); lc_esnprintf(ia32_get_arg_env(), cmnt_buf, SNPRINTF_BUF_LEN, "/* %+F(%+F) */", irn, get_cfop_target_block(irn)); } else { cmd_buf[0] = '\0'; lc_esnprintf(ia32_get_arg_env(), cmnt_buf, SNPRINTF_BUF_LEN, "/* fallthrough %s */", get_cfop_target(irn, buf)); } IA32_DO_EMIT(irn); } /**************************** * _ * (_) * _ __ _ __ ___ _ ___ * | '_ \| '__/ _ \| |/ __| * | |_) | | | (_) | |\__ \ * | .__/|_| \___/| ||___/ * | | _/ | * |_| |__/ ****************************/ /** * Emits code for a proj -> node */ static void emit_Proj(const ir_node *irn, ia32_emit_env_t *env) { ir_node *pred = get_Proj_pred(irn); if (get_irn_op(pred) == op_Start) { switch(get_Proj_proj(irn)) { case pn_Start_X_initial_exec: emit_Jmp(irn, env); break; default: break; } } } /********************************** * _____ ____ * / ____| | _ \ * | | ___ _ __ _ _| |_) | * | | / _ \| '_ \| | | | _ < * | |___| (_) | |_) | |_| | |_) | * \_____\___/| .__/ \__, |____/ * | | __/ | * |_| |___/ **********************************/ /** * Emit movsb/w instructions to make mov count divideable by 4 */ static void emit_CopyB_prolog(FILE *F, int rem, int size) { char cmd_buf[SNPRINTF_BUF_LEN], cmnt_buf[SNPRINTF_BUF_LEN]; fprintf(F, "\t/* memcopy %d bytes*/\n", size); snprintf(cmd_buf, SNPRINTF_BUF_LEN, "cld"); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* copy direction forward*/"); IA32_DO_EMIT(NULL); switch(rem) { case 1: snprintf(cmd_buf, SNPRINTF_BUF_LEN, "movsb"); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* memcopy remainder 1 */"); break; case 2: snprintf(cmd_buf, SNPRINTF_BUF_LEN, "movsw"); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* memcopy remainder 2 */"); break; case 3: snprintf(cmd_buf, SNPRINTF_BUF_LEN, "movsb"); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* memcopy remainder 3 */"); IA32_DO_EMIT(NULL); snprintf(cmd_buf, SNPRINTF_BUF_LEN, "movsw"); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* memcopy remainder 3 */"); break; } IA32_DO_EMIT(NULL); } /** * Emit rep movsd instruction for memcopy. */ static void emit_ia32_CopyB(const ir_node *irn, ia32_emit_env_t *emit_env) { FILE *F = emit_env->out; tarval *tv = get_ia32_Immop_tarval(irn); int rem = get_tarval_long(tv); ir_node *size_node = get_irn_n(irn, 2); int size; char cmd_buf[SNPRINTF_BUF_LEN], cmnt_buf[SNPRINTF_BUF_LEN]; /* beware: size_node could be a be_Copy to fulfill constraints for ecx */ size_node = be_is_Copy(size_node) ? be_get_Copy_op(size_node) : size_node; size = get_tarval_long(get_ia32_Immop_tarval(size_node)); emit_CopyB_prolog(F, rem, size); snprintf(cmd_buf, SNPRINTF_BUF_LEN, "rep movsd"); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* memcopy */"); IA32_DO_EMIT(irn); } /** * Emits unrolled memcopy. */ static void emit_ia32_CopyB_i(const ir_node *irn, ia32_emit_env_t *emit_env) { tarval *tv = get_ia32_Immop_tarval(irn); int size = get_tarval_long(tv); FILE *F = emit_env->out; char cmd_buf[SNPRINTF_BUF_LEN], cmnt_buf[SNPRINTF_BUF_LEN]; emit_CopyB_prolog(F, size & 0x3, size); size >>= 2; while (size--) { snprintf(cmd_buf, SNPRINTF_BUF_LEN, "movsd"); snprintf(cmnt_buf, SNPRINTF_BUF_LEN, "/* memcopy unrolled */"); IA32_DO_EMIT(irn); } } /*************************** * _____ * / ____| * | | ___ _ ____ __ * | | / _ \| '_ \ \ / / * | |___| (_) | | | \ V / * \_____\___/|_| |_|\_/ * ***************************/ /** * Emit code for conversions (I, FP), (FP, I) and (FP, FP). */ static void emit_ia32_Conv_with_FP(const ir_node *irn, ia32_emit_env_t *emit_env) { FILE *F = emit_env->out; const lc_arg_env_t *env = ia32_get_arg_env(); ir_mode *src_mode = get_ia32_src_mode(irn); ir_mode *tgt_mode = get_ia32_tgt_mode(irn); char *from, *to, buf[64]; char cmd_buf[SNPRINTF_BUF_LEN], cmnt_buf[SNPRINTF_BUF_LEN]; from = mode_is_float(src_mode) ? (get_mode_size_bits(src_mode) == 32 ? "ss" : "sd") : "si"; to = mode_is_float(tgt_mode) ? (get_mode_size_bits(tgt_mode) == 32 ? "ss" : "sd") : "si"; switch(get_ia32_op_type(irn)) { case ia32_Normal: lc_esnprintf(env, buf, sizeof(buf), "%1D, %3S", irn, irn); break; case ia32_AddrModeS: lc_esnprintf(env, buf, sizeof(buf), "%1D, %s", irn, ia32_emit_am(irn, emit_env)); break; default: assert(0 && "unsupported op type for Conv"); } snprintf(cmd_buf, SNPRINTF_BUF_LEN, "cvt%s2%s %s", from, to, buf); lc_esnprintf(env, cmnt_buf, SNPRINTF_BUF_LEN, "/* %+F(%+F, %+F) */", irn, src_mode, tgt_mode); IA32_DO_EMIT(irn); } static void emit_ia32_Conv_I2FP(const ir_node *irn, ia32_emit_env_t *emit_env) { emit_ia32_Conv_with_FP(irn, emit_env); } static void emit_ia32_Conv_FP2I(const ir_node *irn, ia32_emit_env_t *emit_env) { emit_ia32_Conv_with_FP(irn, emit_env); } static void emit_ia32_Conv_FP2FP(const ir_node *irn, ia32_emit_env_t *emit_env) { emit_ia32_Conv_with_FP(irn, emit_env); } /** * Emits code for an Int conversion. */ static void emit_ia32_Conv_I2I(const ir_node *irn, ia32_emit_env_t *emit_env) { FILE *F = emit_env->out; const lc_arg_env_t *env = ia32_get_arg_env(); char *move_cmd = "movzx"; char *conv_cmd = NULL; ir_mode *src_mode = get_ia32_src_mode(irn); ir_mode *tgt_mode = get_ia32_tgt_mode(irn); int n, m; char cmd_buf[SNPRINTF_BUF_LEN], cmnt_buf[SNPRINTF_BUF_LEN]; const arch_register_t *in_reg, *out_reg; n = get_mode_size_bits(src_mode); m = get_mode_size_bits(tgt_mode); if (mode_is_signed(n < m ? src_mode : tgt_mode)) { move_cmd = "movsx"; if (n == 8 || m == 8) conv_cmd = "cbw"; else if (n == 16 || m == 16) conv_cmd = "cwde"; else assert(0 && "unsupported Conv_I2I"); } switch(get_ia32_op_type(irn)) { case ia32_Normal: in_reg = get_in_reg(irn, 2); out_reg = get_out_reg(irn, 0); if (REGS_ARE_EQUAL(in_reg, &ia32_gp_regs[REG_EAX]) && REGS_ARE_EQUAL(out_reg, in_reg) && mode_is_signed(n < m ? src_mode : tgt_mode)) { /* argument and result are both in EAX and */ /* signedness is ok: -> use converts */ lc_esnprintf(env, cmd_buf, SNPRINTF_BUF_LEN, "%s", conv_cmd); } else if (REGS_ARE_EQUAL(out_reg, in_reg) && ! mode_is_signed(n < m ? src_mode : tgt_mode)) { /* argument and result are in the same register */ /* and signedness is ok: -> use and with mask */ int mask = (1 << (n < m ? n : m)) - 1; lc_esnprintf(env, cmd_buf, SNPRINTF_BUF_LEN, "and %1D, 0x%x", irn, mask); } else { /* use move w/o sign extension */ lc_esnprintf(env, cmd_buf, SNPRINTF_BUF_LEN, "%s %1D, %%%s", move_cmd, irn, ia32_get_reg_name_for_mode(emit_env, n < m ? src_mode : tgt_mode, in_reg)); } break; case ia32_AddrModeS: lc_esnprintf(env, cmd_buf, SNPRINTF_BUF_LEN, "%s %1D, %s", move_cmd, irn, ia32_emit_am(irn, emit_env)); break; default: assert(0 && "unsupported op type for Conv"); } lc_esnprintf(env, cmnt_buf, SNPRINTF_BUF_LEN, "/* %+F(%d Bit mode_%F -> %d Bit mode_%F) */", irn, n, src_mode, m, tgt_mode); IA32_DO_EMIT(irn); } /** * Emits code for an 8Bit Int conversion. */ void emit_ia32_Conv_I2I8Bit(const ir_node *irn, ia32_emit_env_t *emit_env) { emit_ia32_Conv_I2I(irn, emit_env); } /******************************************* * _ _ * | | | | * | |__ ___ _ __ ___ __| | ___ ___ * | '_ \ / _ \ '_ \ / _ \ / _` |/ _ \/ __| * | |_) | __/ | | | (_) | (_| | __/\__ \ * |_.__/ \___|_| |_|\___/ \__,_|\___||___/ * *******************************************/ /** * Emits a backend call */ static void emit_be_Call(const ir_node *irn, ia32_emit_env_t *emit_env) { FILE *F = emit_env->out; entity *ent = be_Call_get_entity(irn); char cmd_buf[SNPRINTF_BUF_LEN], cmnt_buf[SNPRINTF_BUF_LEN]; if (ent) { snprintf(cmd_buf, SNPRINTF_BUF_LEN, "call %s", get_entity_ld_name(ent)); } else { lc_esnprintf(ia32_get_arg_env(), cmd_buf, SNPRINTF_BUF_LEN, "%1D", get_irn_n(irn, be_pos_Call_ptr)); } lc_esnprintf(ia32_get_arg_env(), cmnt_buf, SNPRINTF_BUF_LEN, "/* %+F (be_Call) */", irn); IA32_DO_EMIT(irn); } /** * Emits code to increase stack pointer. */ static void emit_be_IncSP(const ir_node *irn, ia32_emit_env_t *emit_env) { FILE *F = emit_env->out; unsigned offs = be_get_IncSP_offset(irn); be_stack_dir_t dir = be_get_IncSP_direction(irn); char cmd_buf[SNPRINTF_BUF_LEN], cmnt_buf[SNPRINTF_BUF_LEN]; if (offs) { if (dir == be_stack_dir_expand) lc_esnprintf(ia32_get_arg_env(), cmd_buf, SNPRINTF_BUF_LEN, "sub %1S, %u", irn, offs); else lc_esnprintf(ia32_get_arg_env(), cmd_buf, SNPRINTF_BUF_LEN, "add %1S, %u", irn, offs); lc_esnprintf(ia32_get_arg_env(), cmnt_buf, SNPRINTF_BUF_LEN, "/* %+F (IncSP) */", irn); } else { snprintf(cmd_buf, SNPRINTF_BUF_LEN, " "); lc_esnprintf(ia32_get_arg_env(), cmnt_buf, SNPRINTF_BUF_LEN, "/* omitted %+F (IncSP) with 0 */", irn); } IA32_DO_EMIT(irn); } /** * Emits code to set stack pointer. */ static void emit_be_SetSP(const ir_node *irn, ia32_emit_env_t *emit_env) { FILE *F = emit_env->out; char cmd_buf[SNPRINTF_BUF_LEN], cmnt_buf[SNPRINTF_BUF_LEN]; lc_esnprintf(ia32_get_arg_env(), cmd_buf, SNPRINTF_BUF_LEN, "mov %1D, %3S", irn, irn); lc_esnprintf(ia32_get_arg_env(), cmnt_buf, SNPRINTF_BUF_LEN, "/* %+F (restore SP) */", irn); IA32_DO_EMIT(irn); } /** * Emits code for Copy. */ static void emit_be_Copy(const ir_node *irn, ia32_emit_env_t *emit_env) { FILE *F = emit_env->out; const arch_env_t *aenv = emit_env->arch_env; char cmd_buf[SNPRINTF_BUF_LEN], cmnt_buf[SNPRINTF_BUF_LEN]; if (REGS_ARE_EQUAL(arch_get_irn_register(aenv, irn), arch_get_irn_register(aenv, be_get_Copy_op(irn)))) return; if (mode_is_float(get_irn_mode(irn))) lc_esnprintf(ia32_get_arg_env(), cmd_buf, SNPRINTF_BUF_LEN, "movs%M %1D, %1S", irn, irn, irn); else lc_esnprintf(ia32_get_arg_env(), cmd_buf, SNPRINTF_BUF_LEN, "mov %1D, %1S", irn, irn); lc_esnprintf(ia32_get_arg_env(), cmnt_buf, SNPRINTF_BUF_LEN, "/* %+F */", irn); IA32_DO_EMIT(irn); } /** * Emits code for exchange. */ static void emit_be_Perm(const ir_node *irn, ia32_emit_env_t *emit_env) { FILE *F = emit_env->out; char cmd_buf[SNPRINTF_BUF_LEN], cmnt_buf[SNPRINTF_BUF_LEN]; lc_esnprintf(ia32_get_arg_env(), cmd_buf, SNPRINTF_BUF_LEN, "xchg %1S, %2S", irn, irn); lc_esnprintf(ia32_get_arg_env(), cmnt_buf, SNPRINTF_BUF_LEN, "/* %+F(%1A, %2A) */", irn, irn, irn); IA32_DO_EMIT(irn); } /** * Emits code for Constant loading. */ static void emit_ia32_Const(const ir_node *n, ia32_emit_env_t *env) { FILE *F = env->out; char cmd_buf[256], cmnt_buf[256]; const lc_arg_env_t *arg_env = ia32_get_arg_env(); if (get_ia32_Immop_tarval(n) == get_tarval_null(get_irn_mode(n))) { const char *instr = "xor"; if (env->isa->opt_arch == arch_pentium_4) { /* P4 prefers sub r, r, others xor r, r */ instr = "sub"; } lc_esnprintf(arg_env, cmd_buf, 256, "%s %1D, %1D ", instr, n, n); lc_esnprintf(arg_env, cmnt_buf, 256, "/* optimized mov 0 to register */"); } else { if (get_ia32_op_type(n) == ia32_SymConst) { lc_esnprintf(arg_env, cmd_buf, 256, "mov %1D, OFFSET FLAT:%C ", n, n); lc_esnprintf(arg_env, cmnt_buf, 256, "/* Move address of SymConst into register */"); } else { lc_esnprintf(arg_env, cmd_buf, 256, "mov %1D, %C ", n, n); lc_esnprintf(arg_env, cmnt_buf, 256, "/* Mov Const into register */"); } } lc_efprintf(arg_env, F, "\t%-35s %-60s /* %+F (%+G) */\n", cmd_buf, cmnt_buf, n, n); } /*********************************************************************************** * _ __ _ * (_) / _| | | * _ __ ___ __ _ _ _ __ | |_ _ __ __ _ _ __ ___ _____ _____ _ __| | __ * | '_ ` _ \ / _` | | '_ \ | _| '__/ _` | '_ ` _ \ / _ \ \ /\ / / _ \| '__| |/ / * | | | | | | (_| | | | | | | | | | | (_| | | | | | | __/\ V V / (_) | | | < * |_| |_| |_|\__,_|_|_| |_| |_| |_| \__,_|_| |_| |_|\___| \_/\_/ \___/|_| |_|\_\ * ***********************************************************************************/ /** * Enters the emitter functions for handled nodes into the generic * pointer of an opcode. */ static void ia32_register_emitters(void) { #define IA32_EMIT2(a,b) op_ia32_##a->ops.generic = (op_func)emit_ia32_##b #define IA32_EMIT(a) IA32_EMIT2(a,a) #define EMIT(a) op_##a->ops.generic = (op_func)emit_##a #define BE_EMIT(a) op_be_##a->ops.generic = (op_func)emit_be_##a /* first clear the generic function pointer for all ops */ clear_irp_opcodes_generic_func(); /* register all emitter functions defined in spec */ ia32_register_spec_emitters(); /* other ia32 emitter functions */ IA32_EMIT(CondJmp); IA32_EMIT(TestJmp); IA32_EMIT(CJmp); IA32_EMIT(CJmpAM); IA32_EMIT(SwitchJmp); IA32_EMIT(CopyB); IA32_EMIT(CopyB_i); IA32_EMIT(Conv_I2FP); IA32_EMIT(Conv_FP2I); IA32_EMIT(Conv_FP2FP); IA32_EMIT(Conv_I2I); IA32_EMIT(Conv_I2I8Bit); IA32_EMIT(Const); IA32_EMIT2(fcomJmp, x87CondJmp); IA32_EMIT2(fcompJmp, x87CondJmp); IA32_EMIT2(fcomppJmp, x87CondJmp); IA32_EMIT2(fcomrJmp, x87CondJmp); IA32_EMIT2(fcomrpJmp, x87CondJmp); IA32_EMIT2(fcomrppJmp, x87CondJmp); /* benode emitter */ BE_EMIT(Call); BE_EMIT(IncSP); BE_EMIT(SetSP); BE_EMIT(Copy); BE_EMIT(Perm); /* firm emitter */ EMIT(Jmp); EMIT(Proj); #undef BE_EMIT #undef EMIT #undef IA32_EMIT2 #undef IA32_EMIT } /** * Emits code for a node. */ static void ia32_emit_node(const ir_node *irn, void *env) { ia32_emit_env_t *emit_env = env; FILE *F = emit_env->out; ir_op *op = get_irn_op(irn); DEBUG_ONLY(firm_dbg_module_t *mod = emit_env->mod;) DBG((mod, LEVEL_1, "emitting code for %+F\n", irn)); if (op->ops.generic) { void (*emit)(const ir_node *, void *) = (void (*)(const ir_node *, void *))op->ops.generic; (*emit)(irn, env); } else { ir_fprintf(F, "\t%35s /* %+F (%+G) */\n", " ", irn, irn); } } /** * Emits gas alignment directives */ static void ia32_emit_alignment(FILE *F, unsigned align, unsigned skip) { fprintf(F, "\t.p2align %u,,%u\n", align, skip); } /** * Emits gas alignment directives for Functions depended on cpu architecture. */ static void ia32_emit_align_func(FILE *F, cpu_support cpu) { unsigned align; unsigned maximum_skip; /* gcc doesn't emit alignment for p4 ?*/ if (cpu == arch_pentium_4) return; switch (cpu) { case arch_i386: align = 2; maximum_skip = 3; break; case arch_i486: align = 4; maximum_skip = 15; break; case arch_k6: align = 5; maximum_skip = 31; break; default: align = 4; maximum_skip = 15; } ia32_emit_alignment(F, align, maximum_skip); } /** * Emits gas alignment directives for Labels depended on cpu architecture. */ static void ia32_emit_align_label(FILE *F, cpu_support cpu) { unsigned align; unsigned maximum_skip; /* gcc doesn't emit alignment for p4 ?*/ if (cpu == arch_pentium_4) return; switch (cpu) { case arch_i386: align = 2; maximum_skip = 3; break; case arch_i486: align = 4; maximum_skip = 15; break; case arch_k6: align = 5; maximum_skip = 7; break; default: align = 4; maximum_skip = 7; } ia32_emit_alignment(F, align, maximum_skip); } /** * Walks over the nodes in a block connected by scheduling edges * and emits code for each node. */ static void ia32_gen_block(ir_node *block, void *env) { ia32_emit_env_t *emit_env = env; const ir_node *irn; int need_label = block != get_irg_start_block(get_irn_irg(block)); if (! is_Block(block)) return; if (need_label && (emit_env->cg->opt & IA32_OPT_EXTBB)) { /* if the extended block scheduler is used, only leader blocks need labels. */ need_label = (block == get_extbb_leader(get_nodes_extbb(block))); } if (need_label) { ia32_emit_align_label(emit_env->out, emit_env->isa->opt_arch); fprintf(emit_env->out, BLOCK_PREFIX("%ld:\n"), get_irn_node_nr(block)); } sched_foreach(block, irn) { ia32_emit_node(irn, env); } } /** * Emits code for function start. */ static void ia32_emit_func_prolog(FILE *F, ir_graph *irg, cpu_support cpu) { entity *irg_ent = get_irg_entity(irg); const char *irg_name = get_entity_ld_name(irg_ent); fprintf(F, "\n"); ia32_switch_section(F, SECTION_TEXT); ia32_emit_align_func(F, cpu); if (get_entity_visibility(irg_ent) == visibility_external_visible) { fprintf(F, ".globl %s\n", irg_name); } ia32_dump_function_object(F, irg_name); fprintf(F, "%s:\n", irg_name); } /** * Emits code for function end */ static void ia32_emit_func_epilog(FILE *F, ir_graph *irg) { const char *irg_name = get_entity_ld_name(get_irg_entity(irg)); fprintf(F, "\tret\n"); ia32_dump_function_size(F, irg_name); fprintf(F, "\n"); } /** * Block-walker: * Sets labels for control flow nodes (jump target) * TODO: Jump optimization */ static void ia32_gen_labels(ir_node *block, void *env) { ir_node *pred; int n = get_Block_n_cfgpreds(block); for (n--; n >= 0; n--) { pred = get_Block_cfgpred(block, n); set_irn_link(pred, block); } } /** * Main driver. Emits the code for one routine. */ void ia32_gen_routine(FILE *F, ir_graph *irg, const ia32_code_gen_t *cg) { ia32_emit_env_t emit_env; ir_node *block; emit_env.out = F; emit_env.arch_env = cg->arch_env; emit_env.cg = cg; emit_env.isa = (ia32_isa_t *)cg->arch_env->isa; FIRM_DBG_REGISTER(emit_env.mod, "firm.be.ia32.emitter"); /* set the global arch_env (needed by print hooks) */ arch_env = cg->arch_env; ia32_register_emitters(); ia32_emit_func_prolog(F, irg, emit_env.isa->opt_arch); irg_block_walk_graph(irg, ia32_gen_labels, NULL, &emit_env); if ((cg->opt & IA32_OPT_EXTBB) && cg->blk_sched) { int i, n = ARR_LEN(cg->blk_sched); for (i = 0; i < n;) { ir_node *next_bl; block = cg->blk_sched[i]; ++i; next_bl = i < n ? cg->blk_sched[i] : NULL; /* set here the link. the emitter expects to find the next block here */ set_irn_link(block, next_bl); ia32_gen_block(block, &emit_env); } } else { /* "normal" block schedule: Note the get_next_block() returns the NUMBER of the block in the block schedule. As this number should NEVER be equal the next block, we does not need a clear block link here. */ irg_walk_blkwise_graph(irg, NULL, ia32_gen_block, &emit_env); } ia32_emit_func_epilog(F, irg); }