Merge commit '85f5c18fef1ff2f19d698f150e23a02acd6f59b9' into vulkan

[mesa.git] / src / compiler / nir / nir_print.c

/*
 * Copyright © 2014 Intel 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.
 *
 * Authors:
 *    Connor Abbott (cwabbott0@gmail.com)
 *
 */

#include "nir.h"
#include "compiler/shader_enums.h"
#include <stdio.h>
#include <stdlib.h>

static void
print_tabs(unsigned num_tabs, FILE *fp)
{
   for (unsigned i = 0; i < num_tabs; i++)
      fprintf(fp, "\t");
}

typedef struct {
   FILE *fp;
   nir_shader *shader;
   /** map from nir_variable -> printable name */
   struct hash_table *ht;

   /** set of names used so far for nir_variables */
   struct set *syms;

   /* an index used to make new non-conflicting names */
   unsigned index;
} print_state;

static void
print_register(nir_register *reg, print_state *state)
{
   FILE *fp = state->fp;
   if (reg->name != NULL)
      fprintf(fp, "/* %s */ ", reg->name);
   if (reg->is_global)
      fprintf(fp, "gr%u", reg->index);
   else
      fprintf(fp, "r%u", reg->index);
}

static const char *sizes[] = { "error", "vec1", "vec2", "vec3", "vec4" };

static void
print_register_decl(nir_register *reg, print_state *state)
{
   FILE *fp = state->fp;
   fprintf(fp, "decl_reg %s ", sizes[reg->num_components]);
   if (reg->is_packed)
      fprintf(fp, "(packed) ");
   print_register(reg, state);
   if (reg->num_array_elems != 0)
      fprintf(fp, "[%u]", reg->num_array_elems);
   fprintf(fp, "\n");
}

static void
print_ssa_def(nir_ssa_def *def, print_state *state)
{
   FILE *fp = state->fp;
   if (def->name != NULL)
      fprintf(fp, "/* %s */ ", def->name);
   fprintf(fp, "%s ssa_%u", sizes[def->num_components], def->index);
}

static void
print_ssa_use(nir_ssa_def *def, print_state *state)
{
   FILE *fp = state->fp;
   if (def->name != NULL)
      fprintf(fp, "/* %s */ ", def->name);
   fprintf(fp, "ssa_%u", def->index);
}

static void print_src(nir_src *src, print_state *state);

static void
print_reg_src(nir_reg_src *src, print_state *state)
{
   FILE *fp = state->fp;
   print_register(src->reg, state);
   if (src->reg->num_array_elems != 0) {
      fprintf(fp, "[%u", src->base_offset);
      if (src->indirect != NULL) {
         fprintf(fp, " + ");
         print_src(src->indirect, state);
      }
      fprintf(fp, "]");
   }
}

static void
print_reg_dest(nir_reg_dest *dest, print_state *state)
{
   FILE *fp = state->fp;
   print_register(dest->reg, state);
   if (dest->reg->num_array_elems != 0) {
      fprintf(fp, "[%u", dest->base_offset);
      if (dest->indirect != NULL) {
         fprintf(fp, " + ");
         print_src(dest->indirect, state);
      }
      fprintf(fp, "]");
   }
}

static void
print_src(nir_src *src, print_state *state)
{
   if (src->is_ssa)
      print_ssa_use(src->ssa, state);
   else
      print_reg_src(&src->reg, state);
}

static void
print_dest(nir_dest *dest, print_state *state)
{
   if (dest->is_ssa)
      print_ssa_def(&dest->ssa, state);
   else
      print_reg_dest(&dest->reg, state);
}

static void
print_alu_src(nir_alu_instr *instr, unsigned src, print_state *state)
{
   FILE *fp = state->fp;

   if (instr->src[src].negate)
      fprintf(fp, "-");
   if (instr->src[src].abs)
      fprintf(fp, "abs(");

   print_src(&instr->src[src].src, state);

   bool print_swizzle = false;
   for (unsigned i = 0; i < 4; i++) {
      if (!nir_alu_instr_channel_used(instr, src, i))
         continue;

      if (instr->src[src].swizzle[i] != i) {
         print_swizzle = true;
         break;
      }
   }

   if (print_swizzle) {
      fprintf(fp, ".");
      for (unsigned i = 0; i < 4; i++) {
         if (!nir_alu_instr_channel_used(instr, src, i))
            continue;

         fprintf(fp, "%c", "xyzw"[instr->src[src].swizzle[i]]);
      }
   }

   if (instr->src[src].abs)
      fprintf(fp, ")");
}

static void
print_alu_dest(nir_alu_dest *dest, print_state *state)
{
   FILE *fp = state->fp;
   /* we're going to print the saturate modifier later, after the opcode */

   print_dest(&dest->dest, state);

   if (!dest->dest.is_ssa &&
       dest->write_mask != (1 << dest->dest.reg.reg->num_components) - 1) {
      fprintf(fp, ".");
      for (unsigned i = 0; i < 4; i++)
         if ((dest->write_mask >> i) & 1)
            fprintf(fp, "%c", "xyzw"[i]);
   }
}

static void
print_alu_instr(nir_alu_instr *instr, print_state *state)
{
   FILE *fp = state->fp;

   print_alu_dest(&instr->dest, state);

   fprintf(fp, " = %s", nir_op_infos[instr->op].name);
   if (instr->dest.saturate)
      fprintf(fp, ".sat");
   fprintf(fp, " ");

   for (unsigned i = 0; i < nir_op_infos[instr->op].num_inputs; i++) {
      if (i != 0)
         fprintf(fp, ", ");

      print_alu_src(instr, i, state);
   }
}

static const char *
get_var_name(nir_variable *var, print_state *state)
{
   if (state->ht == NULL)
      return var->name;

   assert(state->syms);

   struct hash_entry *entry = _mesa_hash_table_search(state->ht, var);
   if (entry)
      return entry->data;

   char *name;
   if (var->name == NULL) {
      name = ralloc_asprintf(state->syms, "@%u", state->index++);
   } else {
      struct set_entry *set_entry = _mesa_set_search(state->syms, var->name);
      if (set_entry != NULL) {
         /* we have a collision with another name, append an @ + a unique
          * index */
         name = ralloc_asprintf(state->syms, "%s@%u", var->name,
                                state->index++);
      } else {
         /* Mark this one as seen */
         _mesa_set_add(state->syms, var->name);
         name = var->name;
      }
   }

   _mesa_hash_table_insert(state->ht, var, name);

   return name;
}

static void
print_constant(nir_constant *c, const struct glsl_type *type, print_state *state)
{
   FILE *fp = state->fp;
   unsigned total_elems = glsl_get_components(type);
   unsigned i;

   switch (glsl_get_base_type(type)) {
   case GLSL_TYPE_UINT:
   case GLSL_TYPE_INT:
   case GLSL_TYPE_BOOL:
      for (i = 0; i < total_elems; i++) {
         if (i > 0) fprintf(fp, ", ");
         fprintf(fp, "0x%08x", c->value.u[i]);
      }
      break;

   case GLSL_TYPE_FLOAT:
      for (i = 0; i < total_elems; i++) {
         if (i > 0) fprintf(fp, ", ");
         fprintf(fp, "%f", c->value.f[i]);
      }
      break;

   case GLSL_TYPE_STRUCT:
      for (i = 0; i < c->num_elements; i++) {
         if (i > 0) fprintf(fp, ", ");
         fprintf(fp, "{ ");
         print_constant(c->elements[i], glsl_get_struct_field(type, i), state);
         fprintf(fp, " }");
      }
      break;

   case GLSL_TYPE_ARRAY:
      for (i = 0; i < c->num_elements; i++) {
         if (i > 0) fprintf(fp, ", ");
         fprintf(fp, "{ ");
         print_constant(c->elements[i], glsl_get_array_element(type), state);
         fprintf(fp, " }");
      }
      break;

   default:
      unreachable("not reached");
   }
}

static void
print_var_decl(nir_variable *var, print_state *state)
{
   FILE *fp = state->fp;

   fprintf(fp, "decl_var ");

   const char *const cent = (var->data.centroid) ? "centroid " : "";
   const char *const samp = (var->data.sample) ? "sample " : "";
   const char *const patch = (var->data.patch) ? "patch " : "";
   const char *const inv = (var->data.invariant) ? "invariant " : "";
   const char *const mode[] = { "shader_in ", "shader_out ", "", "",
                                "uniform ", "shader_storage ", "shared ",
                                "system "};

   fprintf(fp, "%s%s%s%s%s%s ",
      cent, samp, patch, inv, mode[var->data.mode],
          glsl_interp_qualifier_name(var->data.interpolation));

   glsl_print_type(var->type, fp);

   fprintf(fp, " %s", get_var_name(var, state));

   if (var->data.mode == nir_var_shader_in ||
       var->data.mode == nir_var_shader_out ||
       var->data.mode == nir_var_uniform ||
       var->data.mode == nir_var_shader_storage) {
      const char *loc = NULL;
      char buf[4];

      switch (state->shader->stage) {
      case MESA_SHADER_VERTEX:
         if (var->data.mode == nir_var_shader_in)
            loc = gl_vert_attrib_name(var->data.location);
         else if (var->data.mode == nir_var_shader_out)
            loc = gl_varying_slot_name(var->data.location);
         break;
      case MESA_SHADER_GEOMETRY:
         if ((var->data.mode == nir_var_shader_in) ||
             (var->data.mode == nir_var_shader_out))
            loc = gl_varying_slot_name(var->data.location);
         break;
      case MESA_SHADER_FRAGMENT:
         if (var->data.mode == nir_var_shader_in)
            loc = gl_varying_slot_name(var->data.location);
         else if (var->data.mode == nir_var_shader_out)
            loc = gl_frag_result_name(var->data.location);
         break;
      case MESA_SHADER_TESS_CTRL:
      case MESA_SHADER_TESS_EVAL:
      case MESA_SHADER_COMPUTE:
      default:
         /* TODO */
         break;
      }

      if (!loc) {
         snprintf(buf, sizeof(buf), "%u", var->data.location);
         loc = buf;
      }

      fprintf(fp, " (%s, %u)", loc, var->data.driver_location);
   }

   if (var->constant_initializer) {
      fprintf(fp, " = { ");
      print_constant(var->constant_initializer, var->type, state);
      fprintf(fp, " }");
   }

   fprintf(fp, "\n");
}

static void
print_var(nir_variable *var, print_state *state)
{
   FILE *fp = state->fp;
   fprintf(fp, "%s", get_var_name(var, state));
}

static void
print_deref_var(nir_deref_var *deref, print_state *state)
{
   print_var(deref->var, state);
}

static void
print_deref_array(nir_deref_array *deref, print_state *state)
{
   FILE *fp = state->fp;
   fprintf(fp, "[");
   switch (deref->deref_array_type) {
   case nir_deref_array_type_direct:
      fprintf(fp, "%u", deref->base_offset);
      break;
   case nir_deref_array_type_indirect:
      if (deref->base_offset != 0)
         fprintf(fp, "%u + ", deref->base_offset);
      print_src(&deref->indirect, state);
      break;
   case nir_deref_array_type_wildcard:
      fprintf(fp, "*");
      break;
   }
   fprintf(fp, "]");
}

static void
print_deref_struct(nir_deref_struct *deref, const struct glsl_type *parent_type,
                   print_state *state)
{
   FILE *fp = state->fp;
   fprintf(fp, ".%s", glsl_get_struct_elem_name(parent_type, deref->index));
}

static void
print_deref(nir_deref_var *deref, print_state *state)
{
   nir_deref *tail = &deref->deref;
   nir_deref *pretail = NULL;
   while (tail != NULL) {
      switch (tail->deref_type) {
      case nir_deref_type_var:
         assert(pretail == NULL);
         assert(tail == &deref->deref);
         print_deref_var(deref, state);
         break;

      case nir_deref_type_array:
         assert(pretail != NULL);
         print_deref_array(nir_deref_as_array(tail), state);
         break;

      case nir_deref_type_struct:
         assert(pretail != NULL);
         print_deref_struct(nir_deref_as_struct(tail),
                            pretail->type, state);
         break;

      default:
         unreachable("Invalid deref type");
      }

      pretail = tail;
      tail = pretail->child;
   }
}

static void
print_intrinsic_instr(nir_intrinsic_instr *instr, print_state *state)
{
   const nir_intrinsic_info *info = &nir_intrinsic_infos[instr->intrinsic];
   unsigned num_srcs = info->num_srcs;
   FILE *fp = state->fp;

   if (info->has_dest) {
      print_dest(&instr->dest, state);
      fprintf(fp, " = ");
   }

   fprintf(fp, "intrinsic %s (", info->name);

   for (unsigned i = 0; i < num_srcs; i++) {
      if (i != 0)
         fprintf(fp, ", ");

      print_src(&instr->src[i], state);
   }

   fprintf(fp, ") (");

   for (unsigned i = 0; i < info->num_variables; i++) {
      if (i != 0)
         fprintf(fp, ", ");

      print_deref(instr->variables[i], state);
   }

   fprintf(fp, ") (");

   for (unsigned i = 0; i < info->num_indices; i++) {
      if (i != 0)
         fprintf(fp, ", ");

      fprintf(fp, "%d", instr->const_index[i]);
   }

   fprintf(fp, ")");

   static const char *index_name[NIR_INTRINSIC_NUM_INDEX_FLAGS] = {
      [NIR_INTRINSIC_BASE] = "base",
      [NIR_INTRINSIC_WRMASK] = "wrmask",
      [NIR_INTRINSIC_STREAM_ID] = "stream-id",
      [NIR_INTRINSIC_UCP_ID] = "ucp-id",
      [NIR_INTRINSIC_RANGE] = "range",
      [NIR_INTRINSIC_DESC_SET] = "desc-set",
      [NIR_INTRINSIC_BINDING] = "binding",
   };
   for (unsigned idx = 1; idx < NIR_INTRINSIC_NUM_INDEX_FLAGS; idx++) {
      if (!info->index_map[idx])
         continue;
      fprintf(fp, " /*");
      if (idx == NIR_INTRINSIC_WRMASK) {
         /* special case wrmask to show it as a writemask.. */
         unsigned wrmask = nir_intrinsic_write_mask(instr);
         fprintf(fp, " wrmask=");
         for (unsigned i = 0; i < 4; i++)
            if ((wrmask >> i) & 1)
               fprintf(fp, "%c", "xyzw"[i]);
      } else {
         unsigned off = info->index_map[idx] - 1;
         assert(index_name[idx]);  /* forgot to update index_name table? */
         fprintf(fp, " %s=%d", index_name[idx], instr->const_index[off]);
      }
      fprintf(fp, " */");
   }

   if (!state->shader)
      return;

   struct exec_list *var_list = NULL;

   switch (instr->intrinsic) {
   case nir_intrinsic_load_uniform:
      var_list = &state->shader->uniforms;
      break;
   case nir_intrinsic_load_input:
   case nir_intrinsic_load_per_vertex_input:
      var_list = &state->shader->inputs;
      break;
   case nir_intrinsic_load_output:
   case nir_intrinsic_store_output:
   case nir_intrinsic_store_per_vertex_output:
      var_list = &state->shader->outputs;
      break;
   default:
      return;
   }

   nir_foreach_variable(var, var_list) {
      if ((var->data.driver_location == nir_intrinsic_base(instr)) &&
          var->name) {
         fprintf(fp, "\t/* %s */", var->name);
         break;
      }
   }
}

static void
print_tex_instr(nir_tex_instr *instr, print_state *state)
{
   FILE *fp = state->fp;

   print_dest(&instr->dest, state);

   fprintf(fp, " = ");

   switch (instr->op) {
   case nir_texop_tex:
      fprintf(fp, "tex ");
      break;
   case nir_texop_txb:
      fprintf(fp, "txb ");
      break;
   case nir_texop_txl:
      fprintf(fp, "txl ");
      break;
   case nir_texop_txd:
      fprintf(fp, "txd ");
      break;
   case nir_texop_txf:
      fprintf(fp, "txf ");
      break;
   case nir_texop_txf_ms:
      fprintf(fp, "txf_ms ");
      break;
   case nir_texop_txs:
      fprintf(fp, "txs ");
      break;
   case nir_texop_lod:
      fprintf(fp, "lod ");
      break;
   case nir_texop_tg4:
      fprintf(fp, "tg4 ");
      break;
   case nir_texop_query_levels:
      fprintf(fp, "query_levels ");
      break;
   case nir_texop_texture_samples:
      fprintf(fp, "texture_samples ");
      break;
   case nir_texop_samples_identical:
      fprintf(fp, "samples_identical ");
      break;
   default:
      unreachable("Invalid texture operation");
      break;
   }

   for (unsigned i = 0; i < instr->num_srcs; i++) {
      print_src(&instr->src[i].src, state);

      fprintf(fp, " ");

      switch(instr->src[i].src_type) {
      case nir_tex_src_coord:
         fprintf(fp, "(coord)");
         break;
      case nir_tex_src_projector:
         fprintf(fp, "(projector)");
         break;
      case nir_tex_src_comparitor:
         fprintf(fp, "(comparitor)");
         break;
      case nir_tex_src_offset:
         fprintf(fp, "(offset)");
         break;
      case nir_tex_src_bias:
         fprintf(fp, "(bias)");
         break;
      case nir_tex_src_lod:
         fprintf(fp, "(lod)");
         break;
      case nir_tex_src_ms_index:
         fprintf(fp, "(ms_index)");
         break;
      case nir_tex_src_ddx:
         fprintf(fp, "(ddx)");
         break;
      case nir_tex_src_ddy:
         fprintf(fp, "(ddy)");
         break;
      case nir_tex_src_texture_offset:
         fprintf(fp, "(texture_offset)");
         break;
      case nir_tex_src_sampler_offset:
         fprintf(fp, "(sampler_offset)");
         break;

      default:
         unreachable("Invalid texture source type");
         break;
      }

      fprintf(fp, ", ");
   }

   bool has_nonzero_offset = false;
   for (unsigned i = 0; i < 4; i++) {
      if (instr->const_offset[i] != 0) {
         has_nonzero_offset = true;
         break;
      }
   }

   if (has_nonzero_offset) {
      fprintf(fp, "[%i %i %i %i] (offset), ",
              instr->const_offset[0], instr->const_offset[1],
              instr->const_offset[2], instr->const_offset[3]);
   }

   if (instr->op == nir_texop_tg4) {
      fprintf(fp, "%u (gather_component), ", instr->component);
   }

   if (instr->texture) {
      print_deref(instr->texture, state);
      fprintf(fp, " (texture)");
      if (instr->sampler) {
         print_deref(instr->sampler, state);
         fprintf(fp, " (sampler)");
      }
   } else {
      assert(instr->sampler == NULL);
      fprintf(fp, "%u (texture) %u (sampler)",
              instr->texture_index, instr->sampler_index);
   }
}

static void
print_call_instr(nir_call_instr *instr, print_state *state)
{
   FILE *fp = state->fp;

   fprintf(fp, "call %s ", instr->callee->name);

   for (unsigned i = 0; i < instr->num_params; i++) {
      if (i != 0)
         fprintf(fp, ", ");

      print_deref(instr->params[i], state);
   }

   if (instr->return_deref != NULL) {
      if (instr->num_params != 0)
         fprintf(fp, ", ");
      fprintf(fp, "returning ");
      print_deref(instr->return_deref, state);
   }
}

static void
print_load_const_instr(nir_load_const_instr *instr, print_state *state)
{
   FILE *fp = state->fp;

   print_ssa_def(&instr->def, state);

   fprintf(fp, " = load_const (");

   for (unsigned i = 0; i < instr->def.num_components; i++) {
      if (i != 0)
         fprintf(fp, ", ");

      /*
       * we don't really know the type of the constant (if it will be used as a
       * float or an int), so just print the raw constant in hex for fidelity
       * and then print the float in a comment for readability.
       */

      fprintf(fp, "0x%08x /* %f */", instr->value.u[i], instr->value.f[i]);
   }

   fprintf(fp, ")");
}

static void
print_jump_instr(nir_jump_instr *instr, print_state *state)
{
   FILE *fp = state->fp;

   switch (instr->type) {
   case nir_jump_break:
      fprintf(fp, "break");
      break;

   case nir_jump_continue:
      fprintf(fp, "continue");
      break;

   case nir_jump_return:
      fprintf(fp, "return");
      break;
   }
}

static void
print_ssa_undef_instr(nir_ssa_undef_instr* instr, print_state *state)
{
   FILE *fp = state->fp;
   print_ssa_def(&instr->def, state);
   fprintf(fp, " = undefined");
}

static void
print_phi_instr(nir_phi_instr *instr, print_state *state)
{
   FILE *fp = state->fp;
   print_dest(&instr->dest, state);
   fprintf(fp, " = phi ");
   nir_foreach_phi_src(instr, src) {
      if (&src->node != exec_list_get_head(&instr->srcs))
         fprintf(fp, ", ");

      fprintf(fp, "block_%u: ", src->pred->index);
      print_src(&src->src, state);
   }
}

static void
print_parallel_copy_instr(nir_parallel_copy_instr *instr, print_state *state)
{
   FILE *fp = state->fp;
   nir_foreach_parallel_copy_entry(instr, entry) {
      if (&entry->node != exec_list_get_head(&instr->entries))
         fprintf(fp, "; ");

      print_dest(&entry->dest, state);
      fprintf(fp, " = ");
      print_src(&entry->src, state);
   }
}

static void
print_instr(const nir_instr *instr, print_state *state, unsigned tabs)
{
   FILE *fp = state->fp;
   print_tabs(tabs, fp);

   switch (instr->type) {
   case nir_instr_type_alu:
      print_alu_instr(nir_instr_as_alu(instr), state);
      break;

   case nir_instr_type_call:
      print_call_instr(nir_instr_as_call(instr), state);
      break;

   case nir_instr_type_intrinsic:
      print_intrinsic_instr(nir_instr_as_intrinsic(instr), state);
      break;

   case nir_instr_type_tex:
      print_tex_instr(nir_instr_as_tex(instr), state);
      break;

   case nir_instr_type_load_const:
      print_load_const_instr(nir_instr_as_load_const(instr), state);
      break;

   case nir_instr_type_jump:
      print_jump_instr(nir_instr_as_jump(instr), state);
      break;

   case nir_instr_type_ssa_undef:
      print_ssa_undef_instr(nir_instr_as_ssa_undef(instr), state);
      break;

   case nir_instr_type_phi:
      print_phi_instr(nir_instr_as_phi(instr), state);
      break;

   case nir_instr_type_parallel_copy:
      print_parallel_copy_instr(nir_instr_as_parallel_copy(instr), state);
      break;

   default:
      unreachable("Invalid instruction type");
      break;
   }
}

static int
compare_block_index(const void *p1, const void *p2)
{
   const nir_block *block1 = *((const nir_block **) p1);
   const nir_block *block2 = *((const nir_block **) p2);

   return (int) block1->index - (int) block2->index;
}

static void print_cf_node(nir_cf_node *node, print_state *state,
                          unsigned tabs);

static void
print_block(nir_block *block, print_state *state, unsigned tabs)
{
   FILE *fp = state->fp;

   print_tabs(tabs, fp);
   fprintf(fp, "block block_%u:\n", block->index);

   /* sort the predecessors by index so we consistently print the same thing */

   nir_block **preds =
      malloc(block->predecessors->entries * sizeof(nir_block *));

   struct set_entry *entry;
   unsigned i = 0;
   set_foreach(block->predecessors, entry) {
      preds[i++] = (nir_block *) entry->key;
   }

   qsort(preds, block->predecessors->entries, sizeof(nir_block *),
         compare_block_index);

   print_tabs(tabs, fp);
   fprintf(fp, "/* preds: ");
   for (unsigned i = 0; i < block->predecessors->entries; i++) {
      fprintf(fp, "block_%u ", preds[i]->index);
   }
   fprintf(fp, "*/\n");

   free(preds);

   nir_foreach_instr(block, instr) {
      print_instr(instr, state, tabs);
      fprintf(fp, "\n");
   }

   print_tabs(tabs, fp);
   fprintf(fp, "/* succs: ");
   for (unsigned i = 0; i < 2; i++)
      if (block->successors[i]) {
         fprintf(fp, "block_%u ", block->successors[i]->index);
      }
   fprintf(fp, "*/\n");
}

static void
print_if(nir_if *if_stmt, print_state *state, unsigned tabs)
{
   FILE *fp = state->fp;

   print_tabs(tabs, fp);
   fprintf(fp, "if ");
   print_src(&if_stmt->condition, state);
   fprintf(fp, " {\n");
   foreach_list_typed(nir_cf_node, node, node, &if_stmt->then_list) {
      print_cf_node(node, state, tabs + 1);
   }
   print_tabs(tabs, fp);
   fprintf(fp, "} else {\n");
   foreach_list_typed(nir_cf_node, node, node, &if_stmt->else_list) {
      print_cf_node(node, state, tabs + 1);
   }
   print_tabs(tabs, fp);
   fprintf(fp, "}\n");
}

static void
print_loop(nir_loop *loop, print_state *state, unsigned tabs)
{
   FILE *fp = state->fp;

   print_tabs(tabs, fp);
   fprintf(fp, "loop {\n");
   foreach_list_typed(nir_cf_node, node, node, &loop->body) {
      print_cf_node(node, state, tabs + 1);
   }
   print_tabs(tabs, fp);
   fprintf(fp, "}\n");
}

static void
print_cf_node(nir_cf_node *node, print_state *state, unsigned int tabs)
{
   switch (node->type) {
   case nir_cf_node_block:
      print_block(nir_cf_node_as_block(node), state, tabs);
      break;

   case nir_cf_node_if:
      print_if(nir_cf_node_as_if(node), state, tabs);
      break;

   case nir_cf_node_loop:
      print_loop(nir_cf_node_as_loop(node), state, tabs);
      break;

   default:
      unreachable("Invalid CFG node type");
   }
}

static void
print_function_impl(nir_function_impl *impl, print_state *state)
{
   FILE *fp = state->fp;

   fprintf(fp, "\nimpl %s ", impl->function->name);

   for (unsigned i = 0; i < impl->num_params; i++) {
      if (i != 0)
         fprintf(fp, ", ");

      print_var(impl->params[i], state);
   }

   if (impl->return_var != NULL) {
      if (impl->num_params != 0)
         fprintf(fp, ", ");
      fprintf(fp, "returning ");
      print_var(impl->return_var, state);
   }

   fprintf(fp, "{\n");

   for (unsigned i = 0; i < impl->num_params; i++) {
      fprintf(fp, "\t");
      print_var_decl(impl->params[i], state);
   }

   if (impl->return_var) {
      fprintf(fp, "\t");
      print_var_decl(impl->return_var, state);
   }

   nir_foreach_variable(var, &impl->locals) {
      fprintf(fp, "\t");
      print_var_decl(var, state);
   }

   foreach_list_typed(nir_register, reg, node, &impl->registers) {
      fprintf(fp, "\t");
      print_register_decl(reg, state);
   }

   nir_index_blocks(impl);

   foreach_list_typed(nir_cf_node, node, node, &impl->body) {
      print_cf_node(node, state, 1);
   }

   fprintf(fp, "\tblock block_%u:\n}\n\n", impl->end_block->index);
}

static void
print_function(nir_function *function, print_state *state)
{
   FILE *fp = state->fp;

   fprintf(fp, "decl_function %s ", function->name);

   for (unsigned i = 0; i < function->num_params; i++) {
      if (i != 0)
         fprintf(fp, ", ");

      switch (function->params[i].param_type) {
      case nir_parameter_in:
         fprintf(fp, "in ");
         break;
      case nir_parameter_out:
         fprintf(fp, "out ");
         break;
      case nir_parameter_inout:
         fprintf(fp, "inout ");
         break;
      default:
         unreachable("Invalid parameter type");
      }

      glsl_print_type(function->params[i].type, fp);
   }

   if (function->return_type != NULL) {
      if (function->num_params != 0)
         fprintf(fp, ", ");
      fprintf(fp, "returning ");
      glsl_print_type(function->return_type, fp);
   }

   fprintf(fp, "\n");

   if (function->impl != NULL) {
      print_function_impl(function->impl, state);
      return;
   }
}

static void
init_print_state(print_state *state, nir_shader *shader, FILE *fp)
{
   state->fp = fp;
   state->shader = shader;
   state->ht = _mesa_hash_table_create(NULL, _mesa_hash_pointer,
                                       _mesa_key_pointer_equal);
   state->syms = _mesa_set_create(NULL, _mesa_key_hash_string,
                                  _mesa_key_string_equal);
   state->index = 0;
}

static void
destroy_print_state(print_state *state)
{
   _mesa_hash_table_destroy(state->ht, NULL);
   _mesa_set_destroy(state->syms, NULL);
}

void
nir_print_shader(nir_shader *shader, FILE *fp)
{
   print_state state;
   init_print_state(&state, shader, fp);

   fprintf(fp, "shader: %s\n", gl_shader_stage_name(shader->stage));

   if (shader->info.name)
      fprintf(fp, "name: %s\n", shader->info.name);

   if (shader->info.label)
      fprintf(fp, "label: %s\n", shader->info.label);

   fprintf(fp, "inputs: %u\n", shader->num_inputs);
   fprintf(fp, "outputs: %u\n", shader->num_outputs);
   fprintf(fp, "uniforms: %u\n", shader->num_uniforms);
   fprintf(fp, "shared: %u\n", shader->num_shared);

   nir_foreach_variable(var, &shader->uniforms) {
      print_var_decl(var, &state);
   }

   nir_foreach_variable(var, &shader->inputs) {
      print_var_decl(var, &state);
   }

   nir_foreach_variable(var, &shader->outputs) {
      print_var_decl(var, &state);
   }

   nir_foreach_variable(var, &shader->shared) {
      print_var_decl(var, &state);
   }

   nir_foreach_variable(var, &shader->globals) {
      print_var_decl(var, &state);
   }

   nir_foreach_variable(var, &shader->system_values) {
      print_var_decl(var, &state);
   }

   foreach_list_typed(nir_register, reg, node, &shader->registers) {
      print_register_decl(reg, &state);
   }

   foreach_list_typed(nir_function, func, node, &shader->functions) {
      print_function(func, &state);
   }

   destroy_print_state(&state);
}

void
nir_print_instr(const nir_instr *instr, FILE *fp)
{
   print_state state = {
      .fp = fp,
   };
   print_instr(instr, &state, 0);

}