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/*
* This file is part of libFirm.
* Copyright (C) 2018 Christoph Mallon.
*/
#include "be_t.h"
#include "becconv.h"
#include "betranshlp.h"
#include "bevarargs.h"
#include "gen_riscv_regalloc_if.h"
#include "irgwalk.h"
#include "riscv_bearch_t.h"
#include "riscv_cconv.h"
#include "util.h"
static unsigned const regs_param_gp[] = {
REG_A0,
REG_A1,
REG_A2,
REG_A3,
REG_A4,
REG_A5,
REG_A6,
REG_A7,
};
static unsigned const regs_result_gp[] = {
REG_A0,
REG_A1,
};
static void check_omit_fp(ir_node *node, void *env)
{
/* omit-fp is not possible if:
* - we have allocations on the stack
*/
if (is_Alloc(node) || is_Free(node)) {
bool *can_omit_fp = (bool*) env;
*can_omit_fp = false;
}
}
void riscv_determine_calling_convention(riscv_calling_convention_t *const cconv, ir_type *const fun_type,
unsigned named_parameters, ir_graph *const irg)
{
//int offset = is_method_variadic(fun_type) ? 0 : ARRAY_SIZE(regs_param_gp);
int offset = ARRAY_SIZE(regs_param_gp);
bool omit_fp = false;
if (irg != NULL) {
omit_fp = be_options.omit_fp;
if (omit_fp)
irg_walk_graph(irg, check_omit_fp, NULL, &omit_fp);
riscv_get_irg_data(irg)->omit_fp = omit_fp;
}
/* Handle parameters. */
riscv_reg_or_slot_t *params = NULL;
size_t gp_param = 0;
size_t const n_params = get_method_n_params(fun_type);
assert(is_method_variadic(fun_type) || named_parameters == n_params);
if (n_params != 0) {
params = XMALLOCNZ(riscv_reg_or_slot_t, n_params);
for (size_t i = 0; i != n_params; ++i) {
ir_type *const param_type = get_method_param_type(fun_type, i);
ir_mode *const param_mode = get_type_mode(param_type);
if (!param_mode) {
panic("TODO");
} else if (mode_is_float(param_mode)) {
panic("TODO");
} else {
if (i >= named_parameters && param_type->flags & tf_lowered_dw && gp_param % 2 != 0) {
// variadic arguments with 2 x XLEN size have to be passed in an aligned register pair / stack slots
++gp_param;
}
if (gp_param < ARRAY_SIZE(regs_param_gp))
params[i].reg = &riscv_registers[regs_param_gp[gp_param]];
params[i].offset = (gp_param - offset) * RISCV_REGISTER_SIZE;
++gp_param;
}
}
}
unsigned n_mem_param = gp_param > ARRAY_SIZE(regs_param_gp) ? gp_param - offset : 0;
cconv->param_stack_size = n_mem_param * RISCV_REGISTER_SIZE;
cconv->n_mem_param = n_mem_param;
cconv->parameters = params;
cconv->va_arg_first_slot = named_parameters;
/* Handle results. */
riscv_reg_or_slot_t *results = NULL;
size_t const n_results = get_method_n_ress(fun_type);
if (n_results != 0) {
results = XMALLOCNZ(riscv_reg_or_slot_t, n_results);
size_t gp_res = 0;
for (size_t i = 0; i != n_results; ++i) {
ir_type *const res_type = get_method_res_type(fun_type, i);
ir_mode *const res_mode = get_type_mode(res_type);
if (!res_mode) {
panic("TODO");
} else if (mode_is_float(res_mode)) {
panic("TODO");
} else {
if (gp_res == ARRAY_SIZE(regs_result_gp))
panic("too many gp results");
results[i].reg = &riscv_registers[regs_result_gp[gp_res++]];
}
}
}
cconv->results = results;
if (irg != NULL) {
be_irg_t *birg = be_birg_from_irg(irg);
if (!omit_fp)
rbitset_clear(birg->allocatable_regs, REG_S0);
}
cconv->omit_fp = omit_fp;
}
void riscv_layout_parameter_entities(riscv_calling_convention_t *const cconv, ir_graph *const irg)
{
ir_entity **const param_map = be_collect_parameter_entities(irg);
ir_type *const frame_type = get_irg_frame_type(irg);
ir_entity *const fun_ent = get_irg_entity(irg);
ir_type *const fun_type = get_entity_type(fun_ent);
size_t const n_params = get_method_n_params(fun_type);
for (size_t i = 0; i != n_params; ++i) {
riscv_reg_or_slot_t *const param = &cconv->parameters[i];
ir_type *const param_type = get_method_param_type(fun_type, i);
if (!is_atomic_type(param_type))
panic("unhandled parameter type");
ir_entity *param_ent = param_map[i];
if (!param->reg || is_method_variadic(fun_type)) {
if (!param_ent)
param_ent = new_parameter_entity(frame_type, i, param_type);
assert(get_entity_offset(param_ent) == INVALID_OFFSET);
set_entity_offset(param_ent, param->offset);
}
param->entity = param_ent;
}
free(param_map);
if (is_method_variadic(fun_type)) {
int const offset = (cconv->va_arg_first_slot - RISCV_N_PARAM_REGS) * RISCV_REGISTER_SIZE;
cconv->va_start_addr = be_make_va_start_entity(frame_type, offset);
}
}
void riscv_free_calling_convention(riscv_calling_convention_t *const cconv)
{
free(cconv->parameters);
free(cconv->results);
}
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