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ast2firm.c
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ast2firm.c
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#include <config.h>
#include <assert.h>
#include <string.h>
#include <libfirm/firm.h>
#include "ast_t.h"
#include "type_t.h"
#include "semantic_t.h"
#include "mangle.h"
#include "adt/array.h"
#include "adt/obst.h"
#include "adt/strset.h"
#include "adt/error.h"
#include "adt/xmalloc.h"
#include <libfirm/adt/pdeq.h>
static const variable_t **value_numbers = NULL;
static label_t *labels = NULL;
/** context for the variables, this is usually the stack frame but might
* be something else for things like coroutines */
static ir_node *variable_context = NULL;
typedef struct instantiate_function_t instantiate_function_t;
static ir_type *byte_ir_type = NULL;
static ir_type *void_ptr_type = NULL;
struct instantiate_function_t {
function_t *function;
ir_entity *entity;
type_argument_t *type_arguments;
};
typedef struct type2firm_env_t type2firm_env_t;
struct type2firm_env_t {
int can_cache; /* nonzero if type can safely be cached because
no typevariables are in the hierarchy */
};
static struct obstack obst;
static strset_t instantiated_functions;
static pdeq *instantiate_functions = NULL;
static ir_type *_get_ir_type(type2firm_env_t *env, type_t *type);
static ir_type *get_ir_type(type_t *type);
static void context2firm(const context_t *context);
ir_node *uninitialized_local_var(ir_graph *irg, ir_mode *mode, int pos)
{
const variable_t *variable = value_numbers[pos];
print_warning_prefix(variable->base.source_position);
fprintf(stderr, "variable '%s' might be used uninitialized\n",
variable->base.symbol->string);
return new_r_Unknown(irg, mode);
}
unsigned dbg_snprint(char *buf, unsigned len, const dbg_info *dbg)
{
const source_position_t *pos = (const source_position_t*) dbg;
if (pos == NULL)
return 0;
return (unsigned) snprintf(buf, len, "%s:%u", pos->input_name,
pos->linenr);
}
const char *dbg_retrieve(const dbg_info *dbg, unsigned *line)
{
const source_position_t *pos = (const source_position_t*) dbg;
if (pos == NULL)
return NULL;
if (line != NULL)
*line = pos->linenr;
return pos->input_name;
}
void init_ast2firm(void)
{
}
static void init_ir_types(void)
{
atomic_type_t byte_type;
memset(&byte_type, 0, sizeof(byte_type));
byte_type.base.kind = TYPE_ATOMIC;
byte_type.akind = ATOMIC_TYPE_BYTE;
byte_ir_type = get_ir_type((type_t*) &byte_type);
ir_type *ir_type_void = get_ir_type(type_void);
void_ptr_type = new_type_pointer(ir_type_void);
}
void exit_ast2firm(void)
{
}
static unsigned unique_id = 0;
static ident *unique_ident(const char *tag)
{
char buf[256];
snprintf(buf, sizeof(buf), "%s.%d", tag, unique_id);
unique_id++;
return new_id_from_str(buf);
}
static symbol_t *unique_symbol(const char *tag)
{
obstack_printf(&symbol_obstack, "%s.%d", tag, unique_id);
unique_id++;
const char *string = obstack_finish(&symbol_obstack);
symbol_t *symbol = symbol_table_insert(string);
assert(symbol->string == string);
return symbol;
}
static ir_mode *get_atomic_mode(const atomic_type_kind_t atomic_kind)
{
switch (atomic_kind) {
case ATOMIC_TYPE_BYTE: return mode_Bs;
case ATOMIC_TYPE_UBYTE: return mode_Bu;
case ATOMIC_TYPE_SHORT: return mode_Hs;
case ATOMIC_TYPE_USHORT: return mode_Hu;
case ATOMIC_TYPE_INT: return mode_Is;
case ATOMIC_TYPE_UINT: return mode_Iu;
case ATOMIC_TYPE_LONG: return mode_Ls;
case ATOMIC_TYPE_ULONG: return mode_Lu;
case ATOMIC_TYPE_LONGLONG: return mode_LLs;
case ATOMIC_TYPE_ULONGLONG: return mode_LLu;
case ATOMIC_TYPE_FLOAT: return mode_F;
case ATOMIC_TYPE_DOUBLE: return mode_D;
case ATOMIC_TYPE_BOOL: return mode_Bu;
case ATOMIC_TYPE_INVALID: break;
}
panic("Encountered unknown atomic type");
}
static unsigned get_type_size(type_t *type);
static unsigned get_atomic_type_size(const atomic_type_t *type)
{
switch (type->akind) {
case ATOMIC_TYPE_UBYTE:
case ATOMIC_TYPE_BYTE:
case ATOMIC_TYPE_BOOL:
return 1;
case ATOMIC_TYPE_SHORT:
case ATOMIC_TYPE_USHORT:
return 2;
case ATOMIC_TYPE_INT:
case ATOMIC_TYPE_UINT:
case ATOMIC_TYPE_LONG:
case ATOMIC_TYPE_ULONG:
case ATOMIC_TYPE_FLOAT:
return 4;
case ATOMIC_TYPE_LONGLONG:
case ATOMIC_TYPE_ULONGLONG:
case ATOMIC_TYPE_DOUBLE:
return 8;
case ATOMIC_TYPE_INVALID:
break;
}
panic("Trying to determine size of invalid atomic type");
}
static unsigned get_compound_type_size(compound_type_t *type)
{
ir_type *irtype = get_ir_type((type_t*) type);
return get_type_size_bytes(irtype);
}
static unsigned get_type_reference_type_var_size(const type_reference_t *type)
{
type_variable_t *type_variable = type->type_variable;
if (type_variable->current_type == NULL) {
panic("taking size of unbound type variable");
return 0;
}
return get_type_size(type_variable->current_type);
}
static unsigned get_array_type_size(array_type_t *type)
{
ir_type *irtype = get_ir_type((type_t*) type);
return get_type_size_bytes(irtype);
}
static unsigned get_type_size(type_t *type)
{
switch (type->kind) {
case TYPE_VOID:
return 0;
case TYPE_ATOMIC:
return get_atomic_type_size((const atomic_type_t*) type);
case TYPE_COMPOUND_UNION:
case TYPE_COMPOUND_STRUCT:
return get_compound_type_size((compound_type_t*) type);
case TYPE_FUNCTION:
/* just a pointer to the function */
return get_mode_size_bytes(mode_P);
case TYPE_POINTER:
return get_mode_size_bytes(mode_P);
case TYPE_ARRAY:
return get_array_type_size((array_type_t*) type);
case TYPE_TYPEOF: {
const typeof_type_t *typeof_type = (const typeof_type_t*) type;
return get_type_size(typeof_type->expression->base.type);
}
case TYPE_REFERENCE:
panic("Type reference not resolved");
break;
case TYPE_REFERENCE_TYPE_VARIABLE:
return get_type_reference_type_var_size((type_reference_t*) type);
case TYPE_ERROR:
return 0;
case TYPE_INVALID:
break;
case TYPE_BIND_TYPEVARIABLES:
abort();
}
panic("Trying to determine size of invalid type");
}
static int count_parameters(const function_type_t *function_type)
{
int count = 0;
function_parameter_type_t *param_type = function_type->parameter_types;
while (param_type != NULL) {
param_type = param_type->next;
count++;
}
return count;
}
static ir_type *get_atomic_type(type2firm_env_t *env, const atomic_type_t *type)
{
(void) env;
ir_mode *mode = get_atomic_mode(type->akind);
ir_type *irtype = new_type_primitive(mode);
return irtype;
}
static ir_type *get_function_type(type2firm_env_t *env,
const function_type_t *function_type)
{
type_t *result_type = function_type->result_type;
int n_parameters = count_parameters(function_type);
int n_results = result_type->kind == TYPE_VOID ? 0 : 1;
ir_type *irtype = new_type_method(n_parameters, n_results);
if (result_type->kind != TYPE_VOID) {
ir_type *restype = _get_ir_type(env, result_type);
set_method_res_type(irtype, 0, restype);
}
function_parameter_type_t *param_type = function_type->parameter_types;
int n = 0;
while (param_type != NULL) {
ir_type *p_irtype = _get_ir_type(env, param_type->type);
set_method_param_type(irtype, n, p_irtype);
param_type = param_type->next;
n++;
}
if (function_type->variable_arguments) {
set_method_variadicity(irtype, variadicity_variadic);
}
return irtype;
}
static ir_type *get_pointer_type(type2firm_env_t *env, pointer_type_t *type)
{
type_t *points_to = type->points_to;
ir_type *ir_points_to;
/* Avoid endless recursion if the points_to type contains this poiner type
* again (might be a struct). We therefore first create a void* pointer
* and then set the real points_to type
*/
ir_type *ir_type_void = get_ir_type(type_void);
ir_type *ir_type = new_type_pointer(ir_type_void);
type->base.firm_type = ir_type;
ir_points_to = _get_ir_type(env, points_to);
set_pointer_points_to_type(ir_type, ir_points_to);
return ir_type;
}
static ir_node *expression_to_firm(expression_t *expression);
static ir_tarval *fold_constant_to_tarval(expression_t *expression)
{
assert(is_constant_expression(expression));
ir_graph *old_current_ir_graph = current_ir_graph;
current_ir_graph = get_const_code_irg();
ir_node *cnst = expression_to_firm(expression);
current_ir_graph = old_current_ir_graph;
if (!is_Const(cnst)) {
panic("couldn't fold constant");
}
ir_tarval* tv = get_Const_tarval(cnst);
return tv;
}
long fold_constant_to_int(expression_t *expression)
{
if (expression->kind == EXPR_ERROR)
return 0;
ir_tarval *tv = fold_constant_to_tarval(expression);
if (!tarval_is_long(tv)) {
panic("result of constant folding is not an integer");
}
return get_tarval_long(tv);
}
static ir_type *get_array_type(type2firm_env_t *env, array_type_t *type)
{
type_t *element_type = type->element_type;
ir_type *ir_element_type = _get_ir_type(env, element_type);
ir_type *ir_type = new_type_array(1, ir_element_type);
int size = fold_constant_to_int(type->size_expression);
set_array_bounds_int(ir_type, 0, 0, size);
size_t elemsize = get_type_size_bytes(ir_element_type);
int align = get_type_alignment_bytes(ir_element_type);
if (elemsize % align > 0) {
elemsize += align - (elemsize % align);
}
set_type_size_bytes(ir_type, size * elemsize);
set_type_alignment_bytes(ir_type, align);
set_type_state(ir_type, layout_fixed);
return ir_type;
}
#define INVALID_TYPE ((ir_type*)-1)
static ir_type *get_struct_type(type2firm_env_t *env, compound_type_t *type)
{
symbol_t *symbol = type->symbol;
ident *id;
if (symbol != NULL) {
id = unique_ident(symbol->string);
} else {
id = unique_ident("__anonymous_struct");
}
ir_type *type_ir = new_type_struct(id);
type->base.firm_type = type_ir;
int align_all = 1;
int offset = 0;
compound_entry_t *entry = type->entries;
while (entry != NULL) {
ident *ident = new_id_from_str(entry->symbol->string);
ir_type *entry_ir_type = _get_ir_type(env, entry->type);
int entry_size = get_type_size_bytes(entry_ir_type);
int entry_alignment = get_type_alignment_bytes(entry_ir_type);
int misalign = offset % entry_alignment;
offset += misalign;
ir_entity *entity = new_entity(type_ir, ident, entry_ir_type);
set_entity_offset(entity, offset);
entry->entity = entity;
offset += entry_size;
if (entry_alignment > align_all) {
if (entry_alignment % align_all != 0) {
panic("Uneven alignments not supported yet");
}
align_all = entry_alignment;
}
entry = entry->next;
}
int misalign = offset % align_all;
offset += misalign;
set_type_alignment_bytes(type_ir, align_all);
set_type_size_bytes(type_ir, offset);
set_type_state(type_ir, layout_fixed);
return type_ir;
}
static ir_type *get_union_type(type2firm_env_t *env, compound_type_t *type)
{
symbol_t *symbol = type->symbol;
ident *id;
if (symbol != NULL) {
id = unique_ident(symbol->string);
} else {
id = unique_ident("__anonymous_union");
}
ir_type *type_ir = new_type_union(id);
type->base.firm_type = type_ir;
int align_all = 1;
int size = 0;
compound_entry_t *entry = type->entries;
while (entry != NULL) {
ident *ident = new_id_from_str(entry->symbol->string);
ir_type *entry_ir_type = _get_ir_type(env, entry->type);
int entry_size = get_type_size_bytes(entry_ir_type);
int entry_alignment = get_type_alignment_bytes(entry_ir_type);
ir_entity *entity = new_entity(type_ir, ident, entry_ir_type);
set_entity_offset(entity, 0);
entry->entity = entity;
if (entry_size > size) {
size = entry_size;
}
if (entry_alignment > align_all) {
if (entry_alignment % align_all != 0) {
panic("Uneven alignments not supported yet");
}
align_all = entry_alignment;
}
entry = entry->next;
}
set_type_alignment_bytes(type_ir, align_all);
set_type_size_bytes(type_ir, size);
set_type_state(type_ir, layout_fixed);
return type_ir;
}
static ir_type *get_type_for_type_variable(type2firm_env_t *env,
type_reference_t *ref)
{
assert(ref->base.kind == TYPE_REFERENCE_TYPE_VARIABLE);
type_variable_t *type_variable = ref->type_variable;
type_t *current_type = type_variable->current_type;
if (current_type == NULL) {
fprintf(stderr, "Panic: trying to transform unbound type variable "
"'%s'\n", type_variable->base.symbol->string);
abort();
}
ir_type *ir_type = _get_ir_type(env, current_type);
env->can_cache = 0;
return ir_type;
}
static ir_type *get_type_for_bind_typevariables(type2firm_env_t *env,
bind_typevariables_type_t *type)
{
compound_type_t *polymorphic_type = type->polymorphic_type;
int old_top = typevar_binding_stack_top();
push_type_variable_bindings(polymorphic_type->type_parameters,
type->type_arguments);
ir_type *result = _get_ir_type(env, (type_t*) polymorphic_type);
pop_type_variable_bindings(old_top);
return result;
}
static ir_type *_get_ir_type(type2firm_env_t *env, type_t *type)
{
assert(type != NULL);
if (type->base.firm_type != NULL) {
assert(type->base.firm_type != INVALID_TYPE);
return type->base.firm_type;
}
ir_type *firm_type = NULL;
switch (type->kind) {
case TYPE_ATOMIC:
firm_type = get_atomic_type(env, &type->atomic);
break;
case TYPE_FUNCTION:
firm_type = get_function_type(env, &type->function);
break;
case TYPE_POINTER:
firm_type = get_pointer_type(env, &type->pointer);
break;
case TYPE_ARRAY:
firm_type = get_array_type(env, &type->array);
break;
case TYPE_VOID:
/* there is no mode_VOID in firm, use mode_ANY */
firm_type = new_type_primitive(mode_ANY);
break;
case TYPE_COMPOUND_STRUCT:
firm_type = get_struct_type(env, &type->compound);
break;
case TYPE_COMPOUND_UNION:
firm_type = get_union_type(env, &type->compound);
break;
case TYPE_REFERENCE_TYPE_VARIABLE:
firm_type = get_type_for_type_variable(env, &type->reference);
break;
case TYPE_BIND_TYPEVARIABLES:
firm_type = get_type_for_bind_typevariables(env,
&type->bind_typevariables);
break;
case TYPE_TYPEOF: {
typeof_type_t *typeof_type = (typeof_type_t*) type;
firm_type = get_ir_type(typeof_type->expression->base.type);
break;
}
case TYPE_REFERENCE:
panic("unresolved reference type found");
break;
case TYPE_ERROR:
case TYPE_INVALID:
break;
}
if (firm_type == NULL)
panic("unknown type found");
if (env->can_cache) {
type->base.firm_type = firm_type;
}
return firm_type;
}
static ir_type *get_ir_type(type_t *type)
{
type2firm_env_t env;
env.can_cache = 1;
return _get_ir_type(&env, type);
}
static ir_mode *get_ir_mode(type_t *type)
{
ir_type *irtype = get_ir_type(type);
ir_mode *mode = get_type_mode(irtype);
assert(mode != NULL);
return mode;
}
static ir_mode *get_arithmetic_mode(type_t *type)
{
if (type->kind == TYPE_ATOMIC && type->atomic.akind == ATOMIC_TYPE_BOOL) {
return mode_b;
}
/* TODO: does not work for typealiases, typevariables, etc. */
return get_ir_mode(type);
}
static instantiate_function_t *queue_function_instantiation(
function_t *function, ir_entity *entity)
{
instantiate_function_t *instantiate
= obstack_alloc(&obst, sizeof(instantiate[0]));
memset(instantiate, 0, sizeof(instantiate[0]));
instantiate->function = function;
instantiate->entity = entity;
pdeq_putr(instantiate_functions, instantiate);
return instantiate;
}
static int is_polymorphic_function(const function_t *function)
{
return function->type_parameters != NULL;
}
static ir_entity* get_concept_function_instance_entity(
concept_function_instance_t *function_instance)
{
function_t *function = & function_instance->function;
if (function->e.entity != NULL)
return function->e.entity;
function_type_t *function_type = function->type;
concept_function_t *concept_function = function_instance->concept_function;
concept_t *concept = concept_function->concept;
start_mangle();
mangle_concept_name(concept->base.symbol);
mangle_symbol(concept_function->base.symbol);
concept_instance_t *instance = function_instance->concept_instance;
type_argument_t *argument = instance->type_arguments;
for ( ; argument != NULL; argument = argument->next) {
mangle_type(argument->type);
}
ident *id = finish_mangle();
/* create the entity */
ir_type *global_type = get_glob_type();
ir_type *ir_method_type = get_ir_type((type_t*) function_type);
ir_entity *entity = new_entity(global_type, id, ir_method_type);
set_entity_ld_ident(entity, id);
set_entity_visibility(entity, ir_visibility_local);
function->e.entity = entity;
return entity;
}
static ir_entity* get_function_entity(function_t *function, symbol_t *symbol,
bool exported)
{
function_type_t *function_type = function->type;
int is_polymorphic = is_polymorphic_function(function);
if (!is_polymorphic && function->e.entity != NULL) {
return function->e.entity;
}
start_mangle();
mangle_symbol_simple(symbol);
if (is_polymorphic) {
type_variable_t *type_variable = function->type_parameters;
for ( ; type_variable != NULL; type_variable = type_variable->next) {
mangle_type(type_variable->current_type);
}
}
ident *id = finish_mangle();
/* search for an existing entity */
if (is_polymorphic && function->e.entities != NULL) {
int len = ARR_LEN(function->e.entities);
for (int i = 0; i < len; ++i) {
ir_entity *entity = function->e.entities[i];
if (get_entity_ident(entity) == id) {
return entity;
}
}
}
/* create the entity */
ir_type *global_type = get_glob_type();
ir_type *ir_method_type = get_ir_type((type_t*) function_type);
ir_entity *entity = new_entity(global_type, id, ir_method_type);
set_entity_ld_ident(entity, id);
if (!function->is_extern && !exported) {
set_entity_visibility(entity, ir_visibility_local);
}
if (!is_polymorphic) {
function->e.entity = entity;
} else {
if (function->e.entities == NULL)
function->e.entities = NEW_ARR_F(ir_entity*, 0);
ARR_APP1(ir_entity*, function->e.entities, entity);
}
return entity;
}
static dbg_info* get_dbg_info(const source_position_t *pos)
{
return (dbg_info*) pos;
}
static ir_node *load_from_expression_addr(type_t *type, ir_node *addr,
const source_position_t *pos);
static ir_node *int_const_to_firm(const int_const_t *cnst)
{
ir_mode *mode = get_ir_mode(cnst->base.type);
ir_tarval *tv = new_tarval_from_long(cnst->value, mode);
dbg_info *dbgi = get_dbg_info(&cnst->base.source_position);
return new_d_Const(dbgi, tv);
}
static ir_node *float_const_to_firm(const float_const_t *cnst)
{
ir_mode *mode = get_ir_mode(cnst->base.type);
ir_tarval *tv = new_tarval_from_double(cnst->value, mode);
dbg_info *dbgi = get_dbg_info(&cnst->base.source_position);
return new_d_Const(dbgi, tv);
}
static ir_node *bool_const_to_firm(const bool_const_t *cnst)
{
dbg_info *dbgi = get_dbg_info(&cnst->base.source_position);
if (cnst->value == 0) {
return new_d_Const(dbgi, get_tarval_b_false());
} else {
return new_d_Const(dbgi, get_tarval_b_true());
}
}
static ir_node *create_symconst(dbg_info *dbgi, ir_entity *entity)
{
assert(entity != NULL);
union symconst_symbol sym;
sym.entity_p = entity;
return new_d_SymConst(dbgi, mode_P, sym, symconst_addr_ent);
}
static ir_node *string_const_to_firm(const string_const_t* cnst)
{
ir_type *global_type = get_glob_type();
ir_type *type = new_type_array(1, byte_ir_type);
ir_entity *entity = new_entity(global_type, unique_ident("str"), type);
add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
set_entity_allocation(entity, allocation_static);
set_entity_visibility(entity, ir_visibility_private);
ir_type *elem_type = byte_ir_type;
ir_mode *mode = get_type_mode(elem_type);
const char *string = cnst->value;
const size_t slen = strlen(string) + 1;
set_array_lower_bound_int(type, 0, 0);
set_array_upper_bound_int(type, 0, slen);
set_type_size_bytes(type, slen);
set_type_state(type, layout_fixed);
ir_tarval **tvs = xmalloc(slen * sizeof(tvs[0]));
for (size_t i = 0; i < slen; ++i) {
tvs[i] = new_tarval_from_long(string[i], mode);
}
ir_initializer_t *initializer = create_initializer_compound(slen);
for (size_t i = 0; i < slen; ++i) {
ir_tarval *tv = new_tarval_from_long(string[i], mode);
ir_initializer_t *val = create_initializer_tarval(tv);
set_initializer_compound_value(initializer, i, val);
}
set_entity_initializer(entity, initializer);
dbg_info *dbgi = get_dbg_info(&cnst->base.source_position);
return create_symconst(dbgi, entity);
}
static ir_node *null_pointer_to_firm(void)
{
ir_mode *mode = get_type_mode(void_ptr_type);
ir_tarval *tv = get_tarval_null(mode);
return new_Const(tv);
}
static ir_node *select_expression_addr(const select_expression_t *select)
{
expression_t *compound_ptr = select->compound;
/* make sure the firm type for the struct is constructed */
get_ir_type(compound_ptr->base.type);
ir_node *compound_ptr_node = expression_to_firm(compound_ptr);
ir_node *nomem = new_NoMem();
ir_entity *entity;
if (select->compound_entry != NULL) {
entity = select->compound_entry->entity;
} else {
// TODO
}
dbg_info *dbgi = get_dbg_info(&select->base.source_position);
ir_node *addr = new_d_simpleSel(dbgi, nomem, compound_ptr_node, entity);
return addr;
}
static ir_node *array_access_expression_addr(const array_access_expression_t* access)
{
expression_t *array_ref = access->array_ref;
expression_t *index = access->index;
ir_node *base_addr = expression_to_firm(array_ref);
ir_node *index_node = expression_to_firm(index);
int elem_size = get_type_size(access->base.type);
ir_tarval *elem_size_tv = new_tarval_from_long(elem_size, mode_Is);
ir_node *elem_size_const = new_Const(elem_size_tv);
dbg_info *dbgi
= get_dbg_info(&access->base.source_position);
ir_node *mul = new_d_Mul(dbgi, index_node, elem_size_const, mode_Is);
ir_node *add = new_d_Add(dbgi, base_addr, mul, mode_P);
return add;
}
static ir_entity *create_variable_entity(variable_t *variable)
{
if (variable->entity != NULL)
return variable->entity;
ir_type *parent_type;
if (variable->is_global) {
parent_type = get_glob_type();
} else if (variable->needs_entity) {
parent_type = get_irg_frame_type(current_ir_graph);
} else {
return NULL;
}
obstack_printf(&obst, "_%s", variable->base.symbol->string);
obstack_1grow(&obst, 0);
char *str = obstack_finish(&obst);
ident *ident = new_id_from_str(str);
obstack_free(&obst, str);
type_t *type = variable->type;
ir_type *irtype = get_ir_type(type);
ir_entity *entity = new_entity(parent_type, ident, irtype);
set_entity_ld_ident(entity, ident);
if (variable->is_extern) {
set_entity_visibility(entity, ir_visibility_external);
} else {
set_entity_visibility(entity, ir_visibility_local);
}
variable->entity = entity;
return entity;
}
static ir_node *variable_addr(variable_t *variable)
{
ir_entity *entity = create_variable_entity(variable);
dbg_info *dbgi = get_dbg_info(&variable->base.source_position);
ir_node *result;
if (variable->is_global) {
result = create_symconst(dbgi, entity);
} else {
assert(variable->needs_entity);
ir_node *nomem = new_NoMem();
result = new_d_simpleSel(dbgi, nomem, variable_context, entity);
}
return result;
}
static ir_node *variable_to_firm(variable_t *variable,
const source_position_t *source_position)
{
if (variable->is_global || variable->needs_entity) {
ir_node *addr = variable_addr(variable);
type_t *type = variable->type;
if (type->kind == TYPE_COMPOUND_STRUCT
|| type->kind == TYPE_COMPOUND_UNION
|| type->kind == TYPE_BIND_TYPEVARIABLES
|| type->kind == TYPE_ARRAY) {
return addr;
}
return load_from_expression_addr(type, addr, source_position);
} else {
ir_mode *mode = get_ir_mode(variable->type);
assert(variable->value_number < get_irg_n_locs(current_ir_graph));
value_numbers[variable->value_number] = variable;
return get_value(variable->value_number, mode);
}
}
static ir_node *constant_reference_to_firm(const constant_t *constant)
{
return expression_to_firm(constant->expression);
}
static ir_node *reference_expression_addr(const reference_expression_t *reference)
{
entity_t *entity = reference->entity;
switch (entity->kind) {
case ENTITY_VARIABLE:
return variable_addr(&entity->variable);
case ENTITY_INVALID:
case ENTITY_ERROR:
case ENTITY_FUNCTION:
case ENTITY_FUNCTION_PARAMETER:
case ENTITY_CONSTANT:
case ENTITY_LABEL:
case ENTITY_TYPEALIAS:
case ENTITY_CONCEPT:
case ENTITY_CONCEPT_FUNCTION:
case ENTITY_TYPE_VARIABLE:
panic("internal error: trying to create address nodes for non-lvalue");
}
panic("Unknown declaration found in reference expression");
}
static ir_node *expression_addr(const expression_t *expression)
{
switch (expression->kind) {
case EXPR_SELECT: {
const select_expression_t *select
= (const select_expression_t*) expression;
return select_expression_addr(select);
}
case EXPR_ARRAY_ACCESS:
return array_access_expression_addr(
(const array_access_expression_t*) expression);
case EXPR_REFERENCE:
return reference_expression_addr(
(const reference_expression_t*) expression);
case EXPR_UNARY_DEREFERENCE: {
const unary_expression_t *unexpr
= (const unary_expression_t*) expression;
return expression_to_firm(unexpr->value);
}
default:
break;
}
panic("trying to get address from non lvalue construct");
}
static void firm_assign(expression_t *dest_expr, ir_node *value,
const source_position_t *source_position)
{
if (dest_expr->kind == EXPR_REFERENCE) {
const reference_expression_t *ref
= (const reference_expression_t*) dest_expr;
entity_t *entity = ref->entity;
if (entity->kind == ENTITY_VARIABLE) {
variable_t *variable = &entity->variable;
if (!variable->is_global && !variable->needs_entity) {
value_numbers[variable->value_number] = variable;
set_value(variable->value_number, value);
return;
}
}
}
ir_node *addr = expression_addr(dest_expr);
ir_node *store = get_store();
dbg_info *dbgi = get_dbg_info(source_position);
type_t *type = dest_expr->base.type;
ir_node *result;
if (type->kind == TYPE_COMPOUND_STRUCT
|| type->kind == TYPE_COMPOUND_UNION) {
ir_type *irtype = get_ir_type(type);
result = new_d_CopyB(dbgi, store, addr, value, irtype);
ir_node *mem = new_Proj(result, mode_M, pn_CopyB_M);
set_store(mem);
} else {
if (get_irn_mode(value) == mode_b) {
value = new_Conv(value, get_atomic_mode(ATOMIC_TYPE_BOOL));
}
result = new_d_Store(dbgi, store, addr, value, cons_none);
ir_node *mem = new_Proj(result, mode_M, pn_Store_M);
set_store(mem);
}
}
static ir_node *assign_expression_to_firm(const binary_expression_t *assign)
{
expression_t *left = assign->left;
expression_t *right = assign->right;
ir_node *value = expression_to_firm(right);
firm_assign(left, value, & assign->base.source_position);
return value;
}