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#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "code-generation.h"
#include "register.h"
#include <assert.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
static void generate_global_variable(CcmmcAst *global_decl, CcmmcState *state)
{
fputs("\t.data\n\t.align\t2\n", state->asm_output);
for (CcmmcAst *var_decl = global_decl->child->right_sibling;
var_decl != NULL; var_decl = var_decl->right_sibling) {
CcmmcSymbol *var_sym = ccmmc_symbol_table_retrieve(state->table,
var_decl->value_id.name);
switch (var_decl->value_id.kind) {
case CCMMC_KIND_ID_NORMAL:
fprintf(state->asm_output, "\t.comm\t%s, 4\n", var_sym->name);
break;
case CCMMC_KIND_ID_ARRAY: {
size_t total_elements = 1;
assert(var_sym->type.array_dimension > 0);
for (size_t i = 0; i < var_sym->type.array_dimension; i++)
total_elements *= var_sym->type.array_size[i];
fprintf(state->asm_output, "\t.comm\t%s, %zu\n",
var_sym->name, total_elements * 4);
} break;
case CCMMC_KIND_ID_WITH_INIT: {
CcmmcAst *init_value = var_decl->child;
fprintf(state->asm_output, "\t.size\t%s, 4\n", var_sym->name);
if (var_sym->type.type_base == CCMMC_AST_VALUE_INT) {
int int_value;
if (init_value->type_node == CCMMC_AST_NODE_CONST_VALUE) {
assert(init_value->value_const.kind == CCMMC_KIND_CONST_INT);
int_value = init_value->value_const.const_int;
} else if (init_value->type_node == CCMMC_AST_NODE_EXPR) {
assert(ccmmc_ast_expr_get_is_constant(init_value));
assert(ccmmc_ast_expr_get_is_int(init_value));
int_value = ccmmc_ast_expr_get_int(init_value);
} else {
assert(false);
}
fprintf(state->asm_output, "%s:\n\t.word\t%d\n",
var_sym->name, int_value);
} else if (var_sym->type.type_base == CCMMC_AST_VALUE_FLOAT) {
float float_value;
if (init_value->type_node == CCMMC_AST_NODE_CONST_VALUE) {
assert(init_value->value_const.kind == CCMMC_KIND_CONST_FLOAT);
float_value = init_value->value_const.const_float;
} else if (init_value->type_node == CCMMC_AST_NODE_EXPR) {
assert(ccmmc_ast_expr_get_is_constant(init_value));
assert(ccmmc_ast_expr_get_is_float(init_value));
float_value = ccmmc_ast_expr_get_float(init_value);
} else {
assert(false);
}
fprintf(state->asm_output, "%s:\n\t.float\t%.9g\n",
var_sym->name, float_value);
} else {
assert(false);
}
} break;
default:
assert(false);
}
}
}
static void generate_block(
CcmmcAst *block, CcmmcState *state, uint64_t current_offset);
static void generate_statement(
CcmmcAst *stmt, CcmmcState *state, uint64_t current_offset)
{
if (stmt->type_node == CCMMC_AST_NODE_NUL)
return;
if (stmt->type_node == CCMMC_AST_NODE_BLOCK) {
generate_block(stmt, state, current_offset);
return;
}
assert(stmt->type_node == CCMMC_AST_NODE_STMT);
switch(stmt->value_stmt.kind) {
case CCMMC_KIND_STMT_WHILE:
generate_statement(stmt->child->right_sibling,
state, current_offset);
break;
case CCMMC_KIND_STMT_FOR:
break;
case CCMMC_KIND_STMT_ASSIGN:
break;
case CCMMC_KIND_STMT_IF:
generate_statement(stmt->child->right_sibling,
state, current_offset);
break;
case CCMMC_KIND_STMT_FUNCTION_CALL:
break;
case CCMMC_KIND_STMT_RETURN:
break;
default:
assert(false);
}
}
static uint64_t generate_local_variable(
CcmmcAst *local_decl, CcmmcState *state, uint64_t current_offset)
{
for (CcmmcAst *var_decl = local_decl->child->right_sibling;
var_decl != NULL; var_decl = var_decl->right_sibling) {
CcmmcSymbol *var_sym = ccmmc_symbol_table_retrieve(state->table,
var_decl->value_id.name);
switch (var_decl->value_id.kind) {
case CCMMC_KIND_ID_NORMAL:
current_offset += 4;
var_sym->attr.addr = current_offset;
break;
case CCMMC_KIND_ID_ARRAY: {
size_t total_elements = 1;
assert(var_sym->type.array_dimension > 0);
for (size_t i = 0; i < var_sym->type.array_dimension; i++)
total_elements *= var_sym->type.array_size[i];
current_offset += total_elements * 4;
var_sym->attr.addr = current_offset;
} break;
case CCMMC_KIND_ID_WITH_INIT: {
current_offset += 4;
var_sym->attr.addr = current_offset;
} break;
default:
assert(false);
}
}
return current_offset;
}
static void generate_block(
CcmmcAst *block, CcmmcState *state, uint64_t current_offset)
{
ccmmc_symbol_table_reopen_scope(state->table);
CcmmcAst *child = block->child;
uint64_t orig_offset = current_offset;
uint64_t offset_diff = 0;
if (child != NULL && child->type_node == CCMMC_AST_NODE_VARIABLE_DECL_LIST) {
for (CcmmcAst *local = child->child; local != NULL; local = local->right_sibling)
current_offset = generate_local_variable(local, state, current_offset);
offset_diff = current_offset - orig_offset;
if (offset_diff > 0) {
if (offset_diff >= 65536) {
CcmmcTmp *tmp = ccmmc_register_alloc(state->reg_pool);
const char *reg_name = ccmmc_register_lock(state->reg_pool, tmp);
fprintf(state->asm_output,
"\tldr\t%s, =%" PRIu64 "\n"
"\tsub\tsp, sp, %s\n", reg_name, offset_diff, reg_name);
ccmmc_register_unlock(state->reg_pool, tmp);
ccmmc_register_free(state->reg_pool, tmp);
} else {
fprintf(state->asm_output, "\tsub\tsp, sp, #%" PRIu64 "\n",
offset_diff);
}
}
child = child->right_sibling;
}
if (child != NULL && child->type_node == CCMMC_AST_NODE_STMT_LIST) {
for (CcmmcAst *stmt = child->child; stmt != NULL; stmt = stmt->right_sibling)
generate_statement(stmt, state, current_offset);
}
if (offset_diff > 0) {
if (offset_diff >= 65536) {
CcmmcTmp *tmp = ccmmc_register_alloc(state->reg_pool);
const char *reg_name = ccmmc_register_lock(state->reg_pool, tmp);
fprintf(state->asm_output,
"\tldr\t%s, =%" PRIu64 "\n"
"\tadd\tsp, sp, %s\n", reg_name, offset_diff, reg_name);
ccmmc_register_unlock(state->reg_pool, tmp);
ccmmc_register_free(state->reg_pool, tmp);
} else {
fprintf(state->asm_output, "\tadd\tsp, sp, #%" PRIu64 "\n",
offset_diff);
}
}
ccmmc_symbol_table_close_scope(state->table);
}
static void generate_function(CcmmcAst *function, CcmmcState *state)
{
fputs("\t.text\n\t.align\t2\n", state->asm_output);
CcmmcAst *param_node = function->child->right_sibling->right_sibling;
CcmmcAst *block_node = param_node->right_sibling;
generate_block(block_node, state, 0);
}
static void generate_program(CcmmcState *state)
{
for (CcmmcAst *global_decl = state->ast->child; global_decl != NULL;
global_decl = global_decl->right_sibling) {
switch (global_decl->value_decl.kind) {
case CCMMC_KIND_DECL_VARIABLE:
generate_global_variable(global_decl, state);
break;
case CCMMC_KIND_DECL_FUNCTION:
generate_function(global_decl, state);
break;
case CCMMC_KIND_DECL_FUNCTION_PARAMETER:
case CCMMC_KIND_DECL_TYPE:
default:
assert(false);
}
}
}
void ccmmc_code_generation(CcmmcState *state)
{
state->table->this_scope = NULL;
state->table->current = NULL;
ccmmc_symbol_table_reopen_scope(state->table);
state->reg_pool = ccmmc_register_init();
generate_program(state);
}
// vim: set sw=4 ts=4 sts=4 et:
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