#include "iredges.h"
#include "irgwalk.h"
#include "irphase_t.h"
-#include "height.h"
+#include "heights.h"
+/**
+ * An entry in the register state map.
+ */
typedef struct reg_flag_t {
- const arch_register_t *reg; /**< register at an input position.
- may be NULL in case of memory input */
- arch_irn_flags_t flags;
+ const arch_register_t *reg; /**< register at an input position.
+ may be NULL in case of memory input */
+ arch_register_req_type_t flags; /**< requirement flags for this register. */
} reg_flag_t;
/**
* A register state mapping keeps track of the symbol values (=firm nodes)
- * to registers. This is usefull when constructing straight line code
- * which like the function prolog or epilog in some architectures.
+ * to registers. This is useful when constructing straight line code
+ * like the function prolog or epilog in some architectures.
*/
typedef struct register_state_mapping_t {
ir_node **value_map; /**< mapping of state indices to values */
- int **reg_index_map; /**< mapping of regclass,regnum to an index
+ size_t **reg_index_map; /**< mapping of regclass,regnum to an index
into the value_map */
reg_flag_t *regs; /**< registers (and memory values) that form a
state */
ir_node *last_barrier;
} register_state_mapping_t;
+/**
+ * The environment for all helper functions.
+ */
struct beabi_helper_env_t {
- ir_graph *irg;
- register_state_mapping_t prolog;
- register_state_mapping_t epilog;
- ir_phase *stack_order;
+ ir_graph *irg; /**< the graph we operate on */
+ register_state_mapping_t prolog; /**< the register state map for the prolog */
+ register_state_mapping_t epilog; /**< the register state map for the epilog */
+ ir_phase *stack_order; /**< a phase to handle stack dependencies. */
};
+/**
+ * Create a new empty register state map for the given
+ * architecture.
+ *
+ * @param rsm the register state map to be initialized
+ * @param arch_env the architecture environment
+ *
+ * After this call, the register map is initialized to empty.
+ */
static void prepare_rsm(register_state_mapping_t *rsm,
const arch_env_t *arch_env)
{
- unsigned n_reg_classes = arch_env_get_n_reg_class(arch_env);
+ unsigned n_reg_classes = arch_env->n_register_classes;
unsigned c;
- reg_flag_t memory = { NULL, 0 };
+ reg_flag_t memory = { NULL, arch_register_req_type_none };
rsm->regs = NEW_ARR_F(reg_flag_t, 0);
/* memory input at 0 */
ARR_APP1(reg_flag_t, rsm->regs, memory);
rsm->value_map = NULL;
- rsm->reg_index_map = XMALLOCN(int*, n_reg_classes);
+ rsm->reg_index_map = XMALLOCN(size_t*, n_reg_classes);
for (c = 0; c < n_reg_classes; ++c) {
- const arch_register_class_t *cls = arch_env_get_reg_class(arch_env, c);
+ const arch_register_class_t *cls = &arch_env->register_classes[c];
unsigned n_regs = arch_register_class_n_regs(cls);
unsigned r;
- rsm->reg_index_map[c] = XMALLOCN(int, n_regs);
+ rsm->reg_index_map[c] = XMALLOCN(size_t, n_regs);
for (r = 0; r < n_regs; ++r) {
- rsm->reg_index_map[c][r] = -1;
+ rsm->reg_index_map[c][r] = (size_t)-1;
}
}
}
+/**
+ * Destroy a register state map for the given
+ * architecture.
+ *
+ * @param rsm the register state map to be destroyed
+ * @param arch_env the architecture environment
+ *
+ * After this call, the register map is initialized to empty.
+ */
static void free_rsm(register_state_mapping_t *rsm, const arch_env_t *arch_env)
{
- unsigned n_reg_classes = arch_env_get_n_reg_class(arch_env);
+ unsigned n_reg_classes = arch_env->n_register_classes;
unsigned c;
for (c = 0; c < n_reg_classes; ++c) {
rsm->value_map = NULL;
}
+/**
+ * Remove all registers from a register state map.
+ *
+ * @param rsm the register state map to be destroyed
+ * @param arch_env the architecture environment
+ */
static void rsm_clear_regs(register_state_mapping_t *rsm,
const arch_env_t *arch_env)
{
- unsigned n_reg_classes = arch_env_get_n_reg_class(arch_env);
+ unsigned n_reg_classes = arch_env->n_register_classes;
unsigned c;
- reg_flag_t memory = { NULL, 0 };
+ reg_flag_t memory = { NULL, arch_register_req_type_none };
for (c = 0; c < n_reg_classes; ++c) {
- const arch_register_class_t *cls = arch_env_get_reg_class(arch_env, c);
+ const arch_register_class_t *cls = &arch_env->register_classes[c];
unsigned n_regs = arch_register_class_n_regs(cls);
unsigned r;
for (r = 0; r < n_regs; ++r) {
- rsm->reg_index_map[c][r] = -1;
+ rsm->reg_index_map[c][r] = (size_t)-1;
}
}
ARR_RESIZE(reg_flag_t, rsm->regs, 0);
}
}
+/**
+ * Add a register and its constraint flags to a register state map
+ * and return its index inside the map.
+ */
static int rsm_add_reg(register_state_mapping_t *rsm,
- const arch_register_t *reg, arch_irn_flags_t flags)
+ const arch_register_t *reg,
+ arch_register_req_type_t flags)
{
- int input_idx = ARR_LEN(rsm->regs);
+ size_t input_idx = ARR_LEN(rsm->regs);
int cls_idx = reg->reg_class->index;
int reg_idx = reg->index;
reg_flag_t regflag = { reg, flags };
/* we must not have used get_value yet */
- assert(rsm->reg_index_map[cls_idx][reg_idx] == -1);
+ assert(rsm->reg_index_map[cls_idx][reg_idx] == (size_t)-1);
rsm->reg_index_map[cls_idx][reg_idx] = input_idx;
ARR_APP1(reg_flag_t, rsm->regs, regflag);
return input_idx;
}
-
-static ir_node *rsm_get_value(register_state_mapping_t *rsm, int index)
+/**
+ * Retrieve the ir_node stored at the given index in the register state map.
+ */
+static ir_node *rsm_get_value(register_state_mapping_t *rsm, size_t index)
{
- assert(0 <= index && index < ARR_LEN(rsm->value_map));
+ assert(index < ARR_LEN(rsm->value_map));
return rsm->value_map[index];
}
+/**
+ * Retrieve the ir_node occupying the given register in the register state map.
+ */
static ir_node *rsm_get_reg_value(register_state_mapping_t *rsm,
const arch_register_t *reg)
{
- int cls_idx = reg->reg_class->index;
- int reg_idx = reg->index;
- int input_idx = rsm->reg_index_map[cls_idx][reg_idx];
+ int cls_idx = reg->reg_class->index;
+ int reg_idx = reg->index;
+ size_t input_idx = rsm->reg_index_map[cls_idx][reg_idx];
return rsm_get_value(rsm, input_idx);
}
-static void rsm_set_value(register_state_mapping_t *rsm, int index,
+/**
+ * Enter a ir_node at the given index in the register state map.
+ */
+static void rsm_set_value(register_state_mapping_t *rsm, size_t index,
ir_node *value)
{
- assert(0 <= index && index < ARR_LEN(rsm->value_map));
+ assert(index < ARR_LEN(rsm->value_map));
rsm->value_map[index] = value;
}
+/**
+ * Enter a ir_node at the given register in the register state map.
+ */
static void rsm_set_reg_value(register_state_mapping_t *rsm,
const arch_register_t *reg, ir_node *value)
{
- int cls_idx = reg->reg_class->index;
- int reg_idx = reg->index;
- int input_idx = rsm->reg_index_map[cls_idx][reg_idx];
+ int cls_idx = reg->reg_class->index;
+ int reg_idx = reg->index;
+ size_t input_idx = rsm->reg_index_map[cls_idx][reg_idx];
rsm_set_value(rsm, input_idx, value);
}
+/**
+ * Create a Barrier from the registers stored at a register state map.
+ *
+ * @param rsm the register state map
+ * @param block the block to create the Barrier on
+ */
static ir_node *rsm_create_barrier(register_state_mapping_t *rsm,
ir_node *block)
{
- int n_barrier_outs = ARR_LEN(rsm->regs);
+ size_t n_barrier_outs = ARR_LEN(rsm->regs);
ir_node **in = rsm->value_map;
ir_node *barrier;
- int o;
+ size_t o;
assert(ARR_LEN(rsm->value_map) == n_barrier_outs);
arch_set_out_register_req(barrier, o, arch_no_register_req);
proj = new_r_Proj(barrier, mode_M, o);
} else {
- be_set_constr_single_reg_in(barrier, o, reg, 0);
+ be_set_constr_single_reg_in(barrier, o, reg, arch_register_req_type_none);
be_set_constr_single_reg_out(barrier, o, reg, regflag->flags);
proj = new_r_Proj(barrier, reg->reg_class->mode, o);
}
if (env->epilog.reg_index_map != NULL) {
free_rsm(&env->epilog, arch_env);
}
- free(env);
+ xfree(env);
}
void be_prolog_add_reg(beabi_helper_env_t *env, const arch_register_t *reg,
- arch_irn_flags_t flags)
+ arch_register_req_type_t flags)
{
rsm_add_reg(&env->prolog, reg, flags);
}
}
void be_epilog_add_reg(beabi_helper_env_t *env, const arch_register_t *reg,
- arch_irn_flags_t flags, ir_node *value)
+ arch_register_req_type_t flags, ir_node *value)
{
int index = rsm_add_reg(&env->epilog, reg, flags);
rsm_set_value(&env->epilog, index, value);
ir_node *be_epilog_create_return(beabi_helper_env_t *env, dbg_info *dbgi,
ir_node *block)
{
- int n_return_in = ARR_LEN(env->epilog.regs);
+ size_t n_return_in = ARR_LEN(env->epilog.regs);
ir_node **in = env->epilog.value_map;
int n_res = 1; /* TODO */
unsigned pop = 0; /* TODO */
- int i;
+ size_t i;
ir_node *ret;
assert(ARR_LEN(env->epilog.value_map) == n_return_in);
const reg_flag_t *regflag = &env->epilog.regs[i];
const arch_register_t *reg = regflag->reg;
if (reg != NULL) {
- be_set_constr_single_reg_in(ret, i, reg, 0);
+ be_set_constr_single_reg_in(ret, i, reg,
+ arch_register_req_type_none);
}
}
}
-
+/**
+ * Link the node into its block list as a new head.
+ */
static void collect_node(ir_node *node)
{
ir_node *block = get_nodes_block(node);
- ir_node *old = get_irn_link(block);
+ ir_node *old = (ir_node*)get_irn_link(block);
set_irn_link(node, old);
set_irn_link(block, node);
}
+/**
+ * Post-walker: link all nodes that probably access the stack into lists of their block.
+ */
static void link_ops_in_block_walker(ir_node *node, void *data)
{
(void) data;
break;
case iro_Builtin:
if (get_Builtin_kind(node) == ir_bk_return_address) {
- ir_node *param = get_Builtin_param(node, 0);
- tarval *tv = get_Const_tarval(param); /* must be Const */
- long value = get_tarval_long(tv);
+ ir_node *param = get_Builtin_param(node, 0);
+ ir_tarval *tv = get_Const_tarval(param); /* must be Const */
+ long value = get_tarval_long(tv);
if (value > 0) {
- /* we need esp for the climbframe algo */
+ /* not the return address of the current function:
+ * we need the stack pointer for the frame climbing */
collect_node(node);
}
}
}
}
-static heights_t *heights;
+static ir_heights_t *heights;
/**
* Check if a node is somehow data dependent on another one.
return heights_reachable_in_block(heights, n1, n2);
}
+/**
+ * Classical qsort() comparison function behavior:
+ *
+ * 0 if both elements are equal, no node depend on the other
+ * +1 if first depends on second (first is greater)
+ * -1 if second depends on first (second is greater)
+*/
static int cmp_call_dependency(const void *c1, const void *c2)
{
const ir_node *n1 = *(const ir_node **) c1;
const ir_node *n2 = *(const ir_node **) c2;
- /*
- Classical qsort() comparison function behavior:
- 0 if both elements are equal
- 1 if second is "smaller" that first
- -1 if first is "smaller" that second
- */
if (dependent_on(n1, n2))
return 1;
return get_irn_idx(n2) - get_irn_idx(n1);
}
+/**
+ * Block-walker: sorts dependencies and remember them into a phase
+ */
static void process_ops_in_block(ir_node *block, void *data)
{
- ir_phase *phase = data;
+ ir_phase *phase = (ir_phase*)data;
unsigned n;
unsigned n_nodes;
ir_node *node;
ir_node **nodes;
n_nodes = 0;
- for (node = get_irn_link(block); node != NULL; node = get_irn_link(node)) {
+ for (node = (ir_node*)get_irn_link(block); node != NULL;
+ node = (ir_node*)get_irn_link(node)) {
++n_nodes;
}
nodes = XMALLOCN(ir_node*, n_nodes);
n = 0;
- for (node = get_irn_link(block); node != NULL; node = get_irn_link(node)) {
- nodes[n++] = node;;
+ for (node = (ir_node*)get_irn_link(block); node != NULL;
+ node = (ir_node*)get_irn_link(node)) {
+ nodes[n++] = node;
}
assert(n == n_nodes);
/* order nodes according to their data dependencies */
qsort(nodes, n_nodes, sizeof(nodes[0]), cmp_call_dependency);
+ /* remember the calculated dependency into a phase */
for (n = n_nodes-1; n > 0; --n) {
ir_node *node = nodes[n];
ir_node *pred = nodes[n-1];
phase_set_irn_data(phase, node, pred);
}
+ xfree(nodes);
}
void be_collect_stacknodes(beabi_helper_env_t *env)
{
ir_graph *irg = env->irg;
+
+ /* collect all potential^stack accessing nodes */
irg_walk_graph(irg, firm_clear_link, link_ops_in_block_walker, NULL);
assert(env->stack_order == NULL);
env->stack_order = new_phase(irg, phase_irn_init_default);
+ /* use heights to create a total order for those nodes: this order is stored
+ * in the created phase */
heights = heights_new(irg);
irg_block_walk_graph(irg, NULL, process_ops_in_block, env->stack_order);
heights_free(heights);
ir_node *be_get_stack_pred(const beabi_helper_env_t *env, const ir_node *node)
{
- return phase_get_irn_data(env->stack_order, node);
+ return (ir_node*)phase_get_irn_data(env->stack_order, node);
}