#include "../beemitter.h"
#include "../begnuas.h"
#include "../beirg_t.h"
+#include "../be_dbgout.h"
#include "ia32_emitter.h"
#include "gen_ia32_emitter.h"
static const arch_env_t *arch_env;
static const ia32_isa_t *isa;
static ia32_code_gen_t *cg;
+static int do_pic;
+static char pic_base_label[128];
+static ir_label_t exc_label_id;
/**
* Returns the register at in position pos.
ia32_emit_mode_suffix_mode(mode);
}
-static
-char get_xmm_mode_suffix(ir_mode *mode)
+static char get_xmm_mode_suffix(ir_mode *mode)
{
assert(mode_is_float(mode));
switch(get_mode_size_bits(mode)) {
}
}
-static
-void ia32_emit_function_object(const char *name)
-{
- switch (be_gas_flavour) {
- case GAS_FLAVOUR_NORMAL:
- be_emit_cstring("\t.type\t");
- be_emit_string(name);
- be_emit_cstring(", @function\n");
- be_emit_write_line();
- break;
- case GAS_FLAVOUR_MINGW:
- be_emit_cstring("\t.def\t");
- be_emit_string(name);
- be_emit_cstring(";\t.scl\t2;\t.type\t32;\t.endef\n");
- be_emit_write_line();
- break;
- case GAS_FLAVOUR_YASM:
- break;
- default:
- break;
- }
-}
-
-static
-void ia32_emit_function_size(const char *name)
-{
- switch (be_gas_flavour) {
- case GAS_FLAVOUR_NORMAL:
- be_emit_cstring("\t.size\t");
- be_emit_string(name);
- be_emit_cstring(", .-");
- be_emit_string(name);
- be_emit_char('\n');
- be_emit_write_line();
- break;
- case GAS_FLAVOUR_MINGW:
- case GAS_FLAVOUR_YASM:
- break;
- default:
- break;
- }
-}
-
-
void ia32_emit_source_register_or_immediate(const ir_node *node, int pos)
{
ir_node *in = get_irn_n(node, pos);
}
}
-void ia32_emit_am_or_dest_register(const ir_node *node,
- int pos) {
- if(get_ia32_op_type(node) == ia32_Normal) {
- ia32_emit_dest_register(node, pos);
- } else {
- assert(get_ia32_op_type(node) == ia32_AddrModeD);
- ia32_emit_am(node);
- }
-}
-
/**
* Emits registers and/or address mode of a unary operation.
*/
}
}
-static void ia32_emit_entity(ir_entity *entity)
+static void ia32_emit_entity(ir_entity *entity, int no_pic_adjust)
{
ident *id;
id = get_entity_ld_ident(entity);
be_emit_ident(id);
- if(get_entity_owner(entity) == get_tls_type()) {
+ if (get_entity_owner(entity) == get_tls_type()) {
if (get_entity_visibility(entity) == visibility_external_allocated) {
be_emit_cstring("@INDNTPOFF");
} else {
be_emit_cstring("@NTPOFF");
}
}
+
+ if (!no_pic_adjust && do_pic) {
+ /* TODO: only do this when necessary */
+ be_emit_char('-');
+ be_emit_string(pic_base_label);
+ }
}
/**
if (ent != NULL) {
if (is_ia32_am_sc_sign(node))
be_emit_char('-');
- ia32_emit_entity(ent);
+ ia32_emit_entity(ent, 0);
}
if(offs != 0) {
{ NULL, pn_Cmp_Leg }, /* always true */
};
-enum {
- ia32_pn_Cmp_unsigned = 0x1000,
- ia32_pn_Cmp_float = 0x2000,
-};
-
/**
* walks up a tree of copies/perms/spills/reloads to find the original value
* that is moved around
/**
* Returns the target block for a control flow node.
*/
-static
-ir_node *get_cfop_target_block(const ir_node *irn) {
+static ir_node *get_cfop_target_block(const ir_node *irn) {
return get_irn_link(irn);
}
/**
* Emits a block label for the given block.
*/
-static
-void ia32_emit_block_name(const ir_node *block)
+static void ia32_emit_block_name(const ir_node *block)
{
if (has_Block_label(block)) {
- be_emit_string(be_gas_label_prefix());
- be_emit_irprintf("%u", (unsigned)get_Block_label(block));
+ be_emit_string(be_gas_block_label_prefix());
+ be_emit_irprintf("%lu", get_Block_label(block));
} else {
be_emit_cstring(BLOCK_PREFIX);
- be_emit_irprintf("%d", get_irn_node_nr(block));
+ be_emit_irprintf("%ld", get_irn_node_nr(block));
}
}
+/**
+ * Emits an exception label for a given node.
+ */
+static void ia32_emit_exc_label(const ir_node *node)
+{
+ be_emit_string(be_gas_insn_label_prefix());
+ be_emit_irprintf("%lu", get_ia32_exc_label_id(node));
+}
+
/**
* Emits the target label for a control flow node.
*/
*/
static void emit_ia32_Jcc(const ir_node *node)
{
+ int need_parity_label = 0;
const ir_node *proj_true;
const ir_node *proj_false;
const ir_node *block;
/* Some floating point comparisons require a test of the parity flag,
* which indicates that the result is unordered */
switch (pnc & 15) {
- case pn_Cmp_Uo:
+ case pn_Cmp_Uo: {
be_emit_cstring("\tjp ");
ia32_emit_cfop_target(proj_true);
be_emit_finish_line_gas(proj_true);
break;
+ }
case pn_Cmp_Leg:
be_emit_cstring("\tjnp ");
case pn_Cmp_Eq:
case pn_Cmp_Lt:
case pn_Cmp_Le:
- be_emit_cstring("\tjp ");
- ia32_emit_cfop_target(proj_false);
+ /* we need a local label if the false proj is a fallthrough
+ * as the falseblock might have no label emitted then */
+ if (get_cfop_target_block(proj_false) == next_block) {
+ need_parity_label = 1;
+ be_emit_cstring("\tjp 1f");
+ } else {
+ be_emit_cstring("\tjp ");
+ ia32_emit_cfop_target(proj_false);
+ }
be_emit_finish_line_gas(proj_false);
goto emit_jcc;
be_emit_finish_line_gas(proj_true);
}
+ if(need_parity_label) {
+ be_emit_cstring("1:");
+ be_emit_write_line();
+ }
+
/* the second Proj might be a fallthrough */
if (get_cfop_target_block(proj_false) != next_block) {
be_emit_cstring("\tjmp ");
/**
* 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) {
+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(attr->symconst != NULL) {
if(attr->sc_sign)
be_emit_char('-');
- ia32_emit_entity(attr->symconst);
+ ia32_emit_entity(attr->symconst, 0);
}
if(attr->symconst == NULL || attr->offset != 0) {
if(attr->symconst != NULL) {
be_emit_cstring("\tcall ");
if (ent) {
- ia32_emit_entity(ent);
+ ia32_emit_entity(ent, 1);
} else {
const arch_register_t *reg = get_in_reg(node, be_pos_Call_ptr);
be_emit_char('*');
emit_sbb( node, in_hi, out_hi);
}
+static void emit_ia32_GetEIP(const ir_node *node)
+{
+ be_emit_cstring("\tcall ");
+ be_emit_string(pic_base_label);
+ be_emit_finish_line_gas(node);
+
+ be_emit_string(pic_base_label);
+ be_emit_cstring(":\n");
+ be_emit_write_line();
+
+ be_emit_cstring("\tpopl ");
+ ia32_emit_dest_register(node, 0);
+ be_emit_char('\n');
+ be_emit_write_line();
+}
+
static void emit_be_Return(const ir_node *node)
{
unsigned pop;
be_emit_cstring("\tret");
pop = be_Return_get_pop(node);
- if(pop > 0) {
+ if (pop > 0 || be_Return_get_emit_pop(node)) {
be_emit_irprintf(" $%d", pop);
}
be_emit_finish_line_gas(node);
* Enters the emitter functions for handled nodes into the generic
* pointer of an opcode.
*/
-static
-void ia32_register_emitters(void) {
+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)
IA32_EMIT(LdTls);
IA32_EMIT(Minus64Bit);
IA32_EMIT(Jcc);
+ IA32_EMIT(GetEIP);
/* benode emitter */
BE_EMIT(Call);
#undef IA32_EMIT
}
-static const char *last_name = NULL;
-static unsigned last_line = -1;
-static unsigned num = -1;
-
-/**
- * Emit the debug support for node node.
- */
-static void ia32_emit_dbg(const ir_node *node)
-{
- dbg_info *db = get_irn_dbg_info(node);
- unsigned lineno;
- const char *fname = ir_retrieve_dbg_info(db, &lineno);
-
- if (! cg->birg->main_env->options->stabs_debug_support)
- return;
-
- if (fname) {
- if (last_name != fname) {
- last_line = -1;
- be_dbg_include_begin(cg->birg->main_env->db_handle, fname);
- last_name = fname;
- }
- if (last_line != lineno) {
- char name[64];
-
- snprintf(name, sizeof(name), ".LM%u", ++num);
- last_line = lineno;
- be_dbg_line(cg->birg->main_env->db_handle, lineno, name);
- be_emit_string(name);
- be_emit_cstring(":\n");
- be_emit_write_line();
- }
- }
-}
-
typedef void (*emit_func_ptr) (const ir_node *);
/**
* Emits code for a node.
*/
-static void ia32_emit_node(const ir_node *node)
+static void ia32_emit_node(ir_node *node)
{
ir_op *op = get_irn_op(node);
DBG((dbg, LEVEL_1, "emitting code for %+F\n", node));
+ if (is_ia32_irn(node) && get_ia32_exc_label(node)) {
+ /* emit the exception label of this instruction */
+ ia32_assign_exc_label(node);
+ }
if (op->ops.generic) {
emit_func_ptr func = (emit_func_ptr) op->ops.generic;
- ia32_emit_dbg(node);
+
+ be_dbg_set_dbg_info(get_irn_dbg_info(node));
+
(*func) (node);
} else {
emit_Nothing(node);
be_emit_write_line();
}
-/**
- * Emits gas alignment directives for Functions depended on cpu architecture.
- */
-static void ia32_emit_align_func(void)
-{
- unsigned align = ia32_cg_config.function_alignment;
- unsigned maximum_skip = (1 << align) - 1;
-
- ia32_emit_alignment(align, maximum_skip);
-}
-
/**
* Emits gas alignment directives for Labels depended on cpu architecture.
*/
static void ia32_emit_align_label(void)
{
unsigned align = ia32_cg_config.label_alignment;
- unsigned maximum_skip = (1 << align) - 1;
+ unsigned maximum_skip = ia32_cg_config.label_alignment_max_skip;
ia32_emit_alignment(align, maximum_skip);
}
/**
- * Test wether a block should be aligned.
+ * Test whether a block should be aligned.
* For cpus in the P4/Athlon class it is useful to align jump labels to
* 16 bytes. However we should only do that if the alignment nops before the
* label aren't executed more often than we have jumps to the label.
return jmp_freq > ia32_cg_config.label_alignment_factor;
}
-static void ia32_emit_block_header(ir_node *block, ir_node *prev)
+/**
+ * Return non-zero, if a instruction in a fall-through.
+ */
+static int is_fallthrough(ir_node *cfgpred)
+{
+ ir_node *pred;
+
+ if(!is_Proj(cfgpred))
+ return 1;
+ pred = get_Proj_pred(cfgpred);
+ if(is_ia32_SwitchJmp(pred))
+ return 0;
+
+ return 1;
+}
+
+/**
+ * Emit the block header for a block.
+ *
+ * @param block the block
+ * @param prev_block the previous block
+ */
+static void ia32_emit_block_header(ir_node *block, ir_node *prev_block)
{
+ ir_graph *irg = current_ir_graph;
int n_cfgpreds;
- int need_label;
+ int need_label = 1;
int i, arity;
- ir_exec_freq *exec_freq = cg->birg->exec_freq;
+ ir_exec_freq *exec_freq = cg->birg->exec_freq;
+
+ if (block == get_irg_end_block(irg) || block == get_irg_start_block(irg))
+ return;
n_cfgpreds = get_Block_n_cfgpreds(block);
- need_label = (n_cfgpreds != 0);
- if (should_align_block(block, prev)) {
- assert(need_label);
- ia32_emit_align_label();
+ if (n_cfgpreds == 0) {
+ need_label = 0;
+ } else if (n_cfgpreds == 1) {
+ ir_node *cfgpred = get_Block_cfgpred(block, 0);
+ if (get_nodes_block(cfgpred) == prev_block && is_fallthrough(cfgpred)) {
+ need_label = 0;
+ }
+ }
+
+ if (ia32_cg_config.label_alignment > 0) {
+ /* align the current block if:
+ * a) if should be aligned due to its execution frequency
+ * b) there is no fall-through here
+ */
+ if (should_align_block(block, prev_block)) {
+ ia32_emit_align_label();
+ } else {
+ /* if the predecessor block has no fall-through,
+ we can always align the label. */
+ int i;
+ ir_node *check_node = NULL;
+
+ for (i = n_cfgpreds - 1; i >= 0; --i) {
+ ir_node *cfg_pred = get_Block_cfgpred(block, i);
+
+ if (get_nodes_block(skip_Proj(cfg_pred)) == prev_block) {
+ check_node = cfg_pred;
+ break;
+ }
+ }
+ if (check_node == NULL || !is_fallthrough(check_node))
+ ia32_emit_align_label();
+ }
}
- if(need_label) {
+ if (need_label || has_Block_label(block)) {
ia32_emit_block_name(block);
be_emit_char(':');
be_emit_pad_comment();
- be_emit_cstring(" /* preds:");
-
- /* emit list of pred blocks in comment */
- arity = get_irn_arity(block);
- for (i = 0; i < arity; ++i) {
- ir_node *predblock = get_Block_cfgpred_block(block, i);
- be_emit_irprintf(" %d", get_irn_node_nr(predblock));
- }
+ be_emit_cstring(" /* ");
} else {
be_emit_cstring("\t/* ");
ia32_emit_block_name(block);
be_emit_cstring(": ");
}
+
+ be_emit_cstring("preds:");
+
+ /* emit list of pred blocks in comment */
+ arity = get_irn_arity(block);
+ for (i = 0; i < arity; ++i) {
+ ir_node *predblock = get_Block_cfgpred_block(block, i);
+ be_emit_irprintf(" %d", get_irn_node_nr(predblock));
+ }
if (exec_freq != NULL) {
be_emit_irprintf(" freq: %f",
get_block_execfreq(exec_freq, block));
*/
static void ia32_gen_block(ir_node *block, ir_node *last_block)
{
- const ir_node *node;
+ ir_node *node;
ia32_emit_block_header(block, last_block);
/* emit the contents of the block */
- ia32_emit_dbg(block);
+ be_dbg_set_dbg_info(get_irn_dbg_info(block));
sched_foreach(block, node) {
ia32_emit_node(node);
}
}
-/**
- * Emits code for function start.
- */
-static void ia32_emit_func_prolog(ir_graph *irg)
-{
- ir_entity *irg_ent = get_irg_entity(irg);
- const char *irg_name = get_entity_ld_name(irg_ent);
- const be_irg_t *birg = cg->birg;
-
- /* write the begin line (used by scripts processing the assembler... */
- be_emit_write_line();
- be_emit_cstring("# -- Begin ");
- be_emit_string(irg_name);
- be_emit_char('\n');
- be_emit_write_line();
-
- be_gas_emit_switch_section(GAS_SECTION_TEXT);
- be_dbg_method_begin(birg->main_env->db_handle, irg_ent, be_abi_get_stack_layout(birg->abi));
- ia32_emit_align_func();
- if (get_entity_visibility(irg_ent) == visibility_external_visible) {
- be_emit_cstring(".global ");
- be_emit_string(irg_name);
- be_emit_char('\n');
- be_emit_write_line();
- }
- ia32_emit_function_object(irg_name);
- be_emit_string(irg_name);
- be_emit_cstring(":\n");
- be_emit_write_line();
-}
-
-/**
- * Emits code for function end
- */
-static void ia32_emit_func_epilog(ir_graph *irg)
-{
- const char *irg_name = get_entity_ld_name(get_irg_entity(irg));
- const be_irg_t *birg = cg->birg;
-
- ia32_emit_function_size(irg_name);
- be_dbg_method_end(birg->main_env->db_handle);
-
- be_emit_cstring("# -- End ");
- be_emit_string(irg_name);
- be_emit_char('\n');
- be_emit_write_line();
-
- be_emit_char('\n');
- be_emit_write_line();
-}
+typedef struct exc_entry {
+ ir_node *exc_instr; /** The instruction that can issue an exception. */
+ ir_node *block; /** The block to call then. */
+} exc_entry;
/**
* Block-walker:
- * Sets labels for control flow nodes (jump target)
+ * Sets labels for control flow nodes (jump target).
+ * Links control predecessors to there destination blocks.
*/
static void ia32_gen_labels(ir_node *block, void *data)
{
+ exc_entry **exc_list = data;
ir_node *pred;
- int n = get_Block_n_cfgpreds(block);
- (void) data;
+ int n;
- for (n--; n >= 0; n--) {
+ for (n = get_Block_n_cfgpreds(block) - 1; n >= 0; --n) {
pred = get_Block_cfgpred(block, n);
set_irn_link(pred, block);
+
+ pred = skip_Proj(pred);
+ if (is_ia32_irn(pred) && get_ia32_exc_label(pred)) {
+ exc_entry e;
+
+ e.exc_instr = pred;
+ e.block = block;
+ ARR_APP1(exc_entry, *exc_list, e);
+ set_irn_link(pred, block);
+ }
}
}
/**
- * Emit an exception label if the current instruction can fail.
+ * Assign and emit an exception label if the current instruction can fail.
*/
-void ia32_emit_exc_label(const ir_node *node)
+void ia32_assign_exc_label(ir_node *node)
{
if (get_ia32_exc_label(node)) {
- be_emit_irprintf(".EXL%u\n", 0);
+ /* assign a new ID to the instruction */
+ set_ia32_exc_label_id(node, ++exc_label_id);
+ /* print it */
+ ia32_emit_exc_label(node);
+ be_emit_char(':');
+ be_emit_pad_comment();
+ be_emit_cstring("/* exception to Block ");
+ ia32_emit_cfop_target(node);
+ be_emit_cstring(" */\n");
be_emit_write_line();
}
}
+/**
+ * Compare two exception_entries.
+ */
+static int cmp_exc_entry(const void *a, const void *b) {
+ const exc_entry *ea = a;
+ const exc_entry *eb = b;
+
+ if (get_ia32_exc_label_id(ea->exc_instr) < get_ia32_exc_label_id(eb->exc_instr))
+ return -1;
+ return +1;
+}
+
/**
* Main driver. Emits the code for one routine.
*/
void ia32_gen_routine(ia32_code_gen_t *ia32_cg, ir_graph *irg)
{
- ir_node *block;
- ir_node *last_block = NULL;
+ ir_node *block;
+ ir_node *last_block = NULL;
+ ir_entity *entity = get_irg_entity(irg);
+ exc_entry *exc_list = NEW_ARR_F(exc_entry, 0);
int i, n;
cg = ia32_cg;
- isa = (const ia32_isa_t*) cg->arch_env->isa;
+ isa = (const ia32_isa_t*) cg->arch_env;
arch_env = cg->arch_env;
+ do_pic = cg->birg->main_env->options->pic;
ia32_register_emitters();
- ia32_emit_func_prolog(irg);
- irg_block_walk_graph(irg, ia32_gen_labels, NULL, NULL);
+ get_unique_label(pic_base_label, sizeof(pic_base_label), ".PIC_BASE");
+
+ be_dbg_method_begin(entity, be_abi_get_stack_layout(cg->birg->abi));
+ be_gas_emit_function_prolog(entity, ia32_cg_config.function_alignment);
+
+ /* we use links to point to target blocks */
+ set_using_irn_link(irg);
+ irg_block_walk_graph(irg, ia32_gen_labels, NULL, &exc_list);
n = ARR_LEN(cg->blk_sched);
for (i = 0; i < n;) {
last_block = block;
}
- ia32_emit_func_epilog(irg);
+ be_gas_emit_function_epilog(entity);
+ be_dbg_method_end();
+ be_emit_char('\n');
+ be_emit_write_line();
+
+ clear_using_irn_link(irg);
+
+ /* Sort the exception table using the exception label id's.
+ Those are ascending with ascending addresses. */
+ qsort(exc_list, ARR_LEN(exc_list), sizeof(exc_list[0]), cmp_exc_entry);
+ {
+ int i;
+
+ for (i = 0; i < ARR_LEN(exc_list); ++i) {
+ be_emit_cstring("\t.long ");
+ ia32_emit_exc_label(exc_list[i].exc_instr);
+ be_emit_char('\n');
+ be_emit_cstring("\t.long ");
+ ia32_emit_block_name(exc_list[i].block);
+ be_emit_char('\n');
+ }
+ }
+ DEL_ARR_F(exc_list);
}
void ia32_init_emitter(void)