* Copyright: (c) Universitaet Karlsruhe
* Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
*
- * Implementation of the RA-Interface for an external, (non-SSA) register allocator
+ * Implementation of the RA-Interface for an external, (non-SSA) register allocator.
+ *
+ * The external register allocator is a program taking 2 arguments:
+ * 1) An input file in which the cfg is defined
+ * 2) An output file containing the essential actions performed during allocation
*/
+#if 0
+===============================================================================
+===============================================================================
+
+The input file format
+----------------------
+
+inputfile ::= regs cfg .
+
+regs ::= 'regs' regcount . // Anzahl der register (0..regcount-1), die zur Verfuegung stehen
+
+cfg ::= 'cfg' ident '{' block* edge* '}' . // Steuerflussgraph der Prozedur
+
+block ::= 'block' block-nr '{' insn* '}' . // Grundblock im cfg versehen mit einer nummer
+
+edge ::= 'cf-edge' block-nr block-nr . // Steuerflusskante src-->tgt
+
+insn ::= gen-insn // Befehl in einem block
+ | copy-insn
+
+gen-insn ::= 'insn' insn-nr '{' uses defs '}' .
+copy-insn ::= 'copy' insn-nr '{' uses defs '}' .
+
+defs ::= 'def' var-list . // Liste der definierten/verwendeten Variablen
+uses ::= 'use' var-list .
+
+var-list ::= var-ref
+ | var-ref var-list
+
+var-ref ::= var-nr
+ | var-nr '<' reg-nr '>' . // reg-nr gibt register constraint an.
+
+
+ident ::= non-whitespace-char*
+regcount, block-nr, insn-nr, reg-nr, var-nr ::= integer
+
+===============================================================================
+===============================================================================
+
+The output file format
+-----------------------
+
+outputfile ::= 'actions' '{' action-list '}'
+TODO
+
+===============================================================================
+===============================================================================
+#endif /* documentation of file formats */
+
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
+#ifdef WIN32
+#include <malloc.h>
+#else
+#include <alloca.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+
#include "pmap.h"
#include "pset.h"
+#include "bitset.h"
#include "irprintf_t.h"
#include "irnode_t.h"
const arch_register_class_t *cls;
ir_graph *irg;
- FILE *f;
- int next_var_nr;
- pmap *vars;
- pmap *blocks;
+ FILE *f; /**< file handle used for out- and input file */
+ pmap *vars; /**< maps variable numbers (int) to the corresponding SSA-values (pset of irns) */
+ pmap *blocks; /**< maps block numbers (int) to the block (ir_node*) having that node_nr */
} be_raext_env_t;
-/* Helpers */
+
+/**
+ * Some little helpers
+ */
#define pmap_insert_sth(pmap, key, val) pmap_insert(pmap, (void *)key, (void *)val)
#define pmap_get_sth(pmap, key) pmap_get(pmap, (void *)key)
-
#define set_var_nr(irn, nr) set_irn_link(irn, INT_TO_PTR(nr))
#define get_var_nr(irn) (PTR_TO_INT(get_irn_link(irn)))
+
+/**
+ * Checks if _the_ result of the irn belongs to the
+ * current register class (raenv->cls)
+ * NOTE: Only the first result is checked.
+ */
#define is_res_in_reg_class(irn) arch_irn_has_reg_class(raenv->aenv, irn, -1, raenv->cls)
+
+/**
+ * Checks if the irn uses or defines values of the
+ * current register class (raenv->cls)
+ */
static INLINE int is_sth_in_reg_class(be_raext_env_t *raenv, const ir_node *irn) {
int max, i;
}
-#ifdef WITH_LIBCORE
-static void be_ra_extern_register_options(lc_opt_entry_t *grp) {
- /* TODO */
-}
-#endif
-
-
/**
* Perform simple SSA-destruction with copies
* TODO: Phi-Swap-Problem
static void values_to_vars(ir_node *irn, void *env) {
be_raext_env_t *raenv = env;
ir_node *n;
+ int nr;
pset *vals;
- if (!is_sth_in_reg_class(raenv, irn))
- return;
-
vals = get_phi_class(irn);
if (!vals) {
}
/* value to var mapping */
- for (n=pset_first(vals); n; n=pset_next(vals))
- set_var_nr(irn, raenv->next_var_nr);
+ n = pset_first(vals);
+ nr = get_irn_node_nr(n);
+ for (; n; n=pset_next(vals))
+ set_var_nr(irn, nr);
/* var to values mapping */
- pmap_insert_sth(raenv->vars, raenv->next_var_nr, vals);
- raenv->next_var_nr++;
+ pmap_insert_sth(raenv->vars, nr, vals);
+}
+
+/**
+ * Check if node irn has a limited-constraint at position pos.
+ * If yes, dump it to FILE raenv->f
+ */
+static INLINE void dump_constraint(be_raext_env_t *raenv, ir_node *irn, int pos) {
+ bitset_t *bs = bitset_alloca(raenv->cls->n_regs);
+ arch_register_req_t req;
+
+ arch_get_register_req(raenv->aenv, &req, irn, pos);
+ if (arch_register_req_is(&req, limited)) {
+ int reg_nr;
+ req.limited(irn, pos, bs);
+ reg_nr = bitset_next_set(bs, 0);
+ fprintf(raenv->f, " <%d>", reg_nr);
+ assert(-1 == bitset_next_set(bs, reg_nr+1) && "Constraints with more than 1 possible register are not supported");
+ }
}
ir_node *irn;
FILE *f = raenv->f;
int nr = get_irn_node_nr(blk);
+
pmap_insert_sth(raenv->blocks, nr, blk);
/* begin block scope */
if (is_Phi(irn) || !is_sth_in_reg_class(raenv, irn))
continue;
- fprintf(f, " insn %d {\n", get_var_nr(irn));
+ fprintf(f, " insn %ld {\n", get_irn_node_nr(irn));
+
+ /*
+ * print all uses
+ */
+ fprintf(f, " use");
+ for (i=0, max=get_irn_arity(irn); i<max; ++i) {
+ ir_node *arg = get_irn_n(irn, i);
+ if (arch_irn_has_reg_class(raenv->aenv, arg, -1, raenv->cls)) {
+ fprintf(f, " %d", get_var_nr(arg));
+ dump_constraint(raenv, irn, i);
+ }
+ }
+ fprintf(f,"\n");
/*
* print all defs
*/
fprintf(f, " def");
+ /* special handling of projs */
if (get_irn_mode(irn) == mode_T) {
for (irn = sched_next(irn); is_Proj(irn); irn = sched_next(irn))
- if (arch_irn_has_reg_class(raenv->aenv, irn, -1, raenv->cls))
+ if (arch_irn_has_reg_class(raenv->aenv, irn, -1, raenv->cls)) {
fprintf(f, " %d", get_var_nr(irn));
+ dump_constraint(raenv, irn, -1);
+ }
irn = sched_prev(irn); /* for outer loop */
} else {
- if (arch_irn_has_reg_class(raenv->aenv, irn, -1, raenv->cls))
+ if (arch_irn_has_reg_class(raenv->aenv, irn, -1, raenv->cls)) {
fprintf(f, " %d", get_var_nr(irn));
+ dump_constraint(raenv, irn, -1);
+ }
}
fprintf(f,"\n");
- /*
- * print all uses
- */
- fprintf(f, " use");
- for (i=0, max=get_irn_arity(irn); i<max; ++i)
- if (arch_irn_has_reg_class(raenv->aenv, get_irn_n(irn, i), -1, raenv->cls))
- fprintf(f, " %d", get_var_nr(irn));
- fprintf(f,"\n");
-
fprintf(f, " }\n");
}
/* end the block scope */
- fprintf(f, " }\n", nr);
+ fprintf(f, " }\n");
}
be_raext_env_t *raenv = env;
int i, max;
+ if (get_irg_start_block(get_irn_irg(blk)) == blk)
+ return;
+
/* dump cf edges in the flow-order "pred succ" */
for (i=0, max=get_irn_arity(blk); i<max; ++i) {
ir_node *pred = get_Block_cfgpred_block(blk, i);
- fprintf(raenv->f, " cf_edge %d %d\n", get_irn_node_nr(pred), get_irn_node_nr(blk));
+ fprintf(raenv->f, " cf_edge %ld %ld\n", get_irn_node_nr(pred), get_irn_node_nr(blk));
}
}
* Dump all information needed by the external
* register allocator to a single file.
*/
-static void dump_file(be_raext_env_t *raenv, char *filename) {
+static void dump_to_file(be_raext_env_t *raenv, char *filename) {
FILE *f;
if (!(f = fopen(filename, "wt"))) {
- fprintf(stderr, "Could not open file %s\n", filename);
+ fprintf(stderr, "Could not open file %s for writing\n", filename);
exit(1);
}
-
raenv->f = f;
+
fprintf(f, "regs %d\n", arch_register_class_n_regs(raenv->cls));
- fprintf(f, "cfg %s {\n", "noname");
+ fprintf(f, "cfg %s {\n", filename);
- fprintf(f, " variables %d\n", pmap_count(raenv->vars));
- irg_block_walk_graph(raenv->irg, dump_blocks, NULL, raenv);
- irg_block_walk_graph(raenv->irg, dump_edges, NULL, raenv);
+ irg_block_walk_graph(raenv->irg, NULL, dump_blocks, raenv);
+ irg_block_walk_graph(raenv->irg, NULL, dump_edges, raenv);
fprintf(f, "}\n");
}
+/**
+ * Execute the external register allocator specified in the
+ * firm-option TODO
+ */
+static void execute(char *out_file, char *result_file) {
+ char cmd_line[1024];
+ char *app_name = "echo"; //TODO get from firm-options file
+ int ret_status;
+
+ snprintf(cmd_line, sizeof(cmd_line), "%s %s %s", app_name, out_file, result_file);
+
+ ret_status = system(cmd_line);
+ assert(ret_status != -1 && "Invokation of external register allocator failed");
+}
+
+
+/**
+ * Read in the actions performed by the external allocator.
+ * Apply these transformations to the irg->
+ */
+static void read_and_apply_results(be_raext_env_t *raenv, char *filename) {
+ FILE *f;
+
+ if (!(f = fopen(filename, "rt"))) {
+ fprintf(stderr, "Could not open file %s for reading\n", filename);
+ exit(1);
+ }
+ raenv->f = f;
+
+ //TODO: free pmap entries (the psets) pmap_foreach(raenv.vars, pme) del_pset(pme->value);
+
+ fclose(f);
+}
+
+
/**
* Allocate registers with an external program using a text-file interface.
*
raenv.aenv = env->arch_env;
raenv.vars = pmap_create();
raenv.blocks = pmap_create();
- raenv.next_var_nr = 0;
/* SSA destruction */
be_clear_links(irg);
char out[256], in[256];
raenv.cls = arch_isa_get_reg_class(raenv.aenv->isa, clsnr);
-
- /* Write file */
ir_snprintf(out, sizeof(out), "%F-%s.ra", irg, raenv.cls->name);
- dump_file(&raenv, out);
-
- /* Call */
- //execute(out, in);
+ ir_snprintf(in, sizeof(in), "%F-%s.ra.res", irg, raenv.cls->name);
- /* Read in results and apply them */
- //apply_results(&raenv, in);
- //NOTE: free pmap entries (the psets) pmap_foreach(raenv.vars, pme) del_pset(pme->value);
+ dump_to_file(&raenv, out);
+ execute(out, in);
+ read_and_apply_results(&raenv, in);
}
/* Clean up */
}
+#ifdef WITH_LIBCORE
+static void be_ra_extern_register_options(lc_opt_entry_t *grp) {
+ /* TODO */
+}
+#endif
+
const be_ra_t be_ra_external_allocator = {
#ifdef WITH_LIBCORE
be_ra_extern_register_options,
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