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/*
* Copyright © 2020 Microsoft Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "nir.h"
#include "nir_builder.h"
#include "nir_builder_opcodes.h"
#include "util/u_math.h"
static bool
lower_printf_instr(nir_builder *b, nir_instr *instr, void *_options)
{
const nir_lower_printf_options *options = _options;
if (instr->type != nir_instr_type_intrinsic)
return false;
nir_intrinsic_instr *prntf = nir_instr_as_intrinsic(instr);
if (prntf->intrinsic != nir_intrinsic_printf)
return false;
nir_ssa_def *fmt_str_id = prntf->src[0].ssa;
nir_deref_instr *args = nir_src_as_deref(prntf->src[1]);
assert(args->deref_type == nir_deref_type_var);
const unsigned ptr_bit_size = nir_get_ptr_bitsize(b->shader);
/* Atomic add a buffer size counter to determine where to write. If
* overflowed, return -1, otherwise, store the arguments and return 0.
*/
b->cursor = nir_before_instr(&prntf->instr);
nir_ssa_def *buffer_addr = nir_load_printf_buffer_address(b, ptr_bit_size);
nir_deref_instr *buffer =
nir_build_deref_cast(b, buffer_addr, nir_var_mem_global,
glsl_array_type(glsl_uint8_t_type(), 0, 4), 0);
/* Align the struct size to 4 */
assert(glsl_type_is_struct_or_ifc(args->type));
int args_size = align(glsl_get_cl_size(args->type), 4);
assert(fmt_str_id->bit_size == 32);
int fmt_str_id_size = 4;
/* Increment the counter at the beginning of the buffer */
const unsigned counter_size = 4;
nir_deref_instr *counter = nir_build_deref_array_imm(b, buffer, 0);
counter = nir_build_deref_cast(b, &counter->dest.ssa,
nir_var_mem_global,
glsl_uint_type(), 0);
counter->cast.align_mul = 4;
nir_ssa_def *offset =
nir_deref_atomic_add(b, 32, &counter->dest.ssa,
nir_imm_int(b, fmt_str_id_size + args_size));
/* Check if we're still in-bounds */
const unsigned default_buffer_size = 1024 * 1024;
unsigned buffer_size = (options && options->max_buffer_size) ?
options->max_buffer_size : default_buffer_size;
int max_valid_offset =
buffer_size - args_size - fmt_str_id_size - counter_size;
nir_push_if(b, nir_ilt(b, offset, nir_imm_int(b, max_valid_offset)));
nir_ssa_def *printf_succ_val = nir_imm_int(b, 0);
/* Write the format string ID */
nir_ssa_def *fmt_str_id_offset =
nir_i2iN(b, offset, ptr_bit_size);
nir_deref_instr *fmt_str_id_deref =
nir_build_deref_array(b, buffer, fmt_str_id_offset);
fmt_str_id_deref = nir_build_deref_cast(b, &fmt_str_id_deref->dest.ssa,
nir_var_mem_global,
glsl_uint_type(), 0);
fmt_str_id_deref->cast.align_mul = 4;
nir_store_deref(b, fmt_str_id_deref, fmt_str_id, ~0);
/* Write the format args */
for (unsigned i = 0; i < glsl_get_length(args->type); ++i) {
nir_deref_instr *arg_deref = nir_build_deref_struct(b, args, i);
nir_ssa_def *arg = nir_load_deref(b, arg_deref);
const struct glsl_type *arg_type = arg_deref->type;
/* Clang does promotion of arguments to their "native" size. That means
* that any floats have been converted to doubles for the call to
* printf. Since doubles are optional, some drivers might not support
* them. For those drivers, convert them back to float before writing.
* Copy prop and other optimizations should remove all hints of doubles.
*/
if (glsl_get_base_type(arg_type) == GLSL_TYPE_DOUBLE &&
options && options->treat_doubles_as_floats) {
arg = nir_f2f32(b, arg);
arg_type = glsl_float_type();
}
unsigned field_offset = glsl_get_struct_field_offset(args->type, i);
nir_ssa_def *arg_offset =
nir_i2iN(b, nir_iadd_imm(b, offset,
fmt_str_id_size + field_offset),
ptr_bit_size);
nir_deref_instr *dst_arg_deref =
nir_build_deref_array(b, buffer, arg_offset);
dst_arg_deref = nir_build_deref_cast(b, &dst_arg_deref->dest.ssa,
nir_var_mem_global, arg_type, 0);
assert(field_offset % 4 == 0);
dst_arg_deref->cast.align_mul = 4;
nir_store_deref(b, dst_arg_deref, arg, ~0);
}
nir_push_else(b, NULL);
nir_ssa_def *printf_fail_val = nir_imm_int(b, -1);
nir_pop_if(b, NULL);
nir_ssa_def *ret_val = nir_if_phi(b, printf_succ_val, printf_fail_val);
nir_ssa_def_rewrite_uses(&prntf->dest.ssa, ret_val);
nir_instr_remove(&prntf->instr);
return true;
}
bool
nir_lower_printf(nir_shader *nir, const nir_lower_printf_options *options)
{
return nir_shader_instructions_pass(nir, lower_printf_instr,
nir_metadata_none,
(void *)options);
}
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