nir: add nir_shader_as_str function

It would be later used by Turnip in implementation of
VK_KHR_pipeline_executable_properties.

Signed-off-by: Danylo Piliaiev <dpiliaiev@igalia.com>
Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8877>

src/compiler/nir/nir.h

@@ -4062,6 +4062,8 @@ void nir_print_shader_annotated(nir_shader *shader, FILE *fp, struct hash_table
 void nir_print_instr(const nir_instr *instr, FILE *fp);
 void nir_print_deref(const nir_deref_instr *deref, FILE *fp);
 
+char *nir_shader_as_str(nir_shader *nir, void *mem_ctx);
+
 /** Shallow clone of a single instruction. */
 nir_instr *nir_instr_clone(nir_shader *s, const nir_instr *orig);
 

src/compiler/nir/nir_print.c

@@ -28,6 +28,7 @@
 #include "nir.h"
 #include "compiler/shader_enums.h"
 #include "util/half_float.h"
+#include "util/memstream.h"
 #include "vulkan/vulkan_core.h"
 #include <stdio.h>
 #include <stdlib.h>
@@ -1669,6 +1670,27 @@ nir_print_shader(nir_shader *shader, FILE *fp)
    fflush(fp);
 }
 
+char *
+nir_shader_as_str(nir_shader *nir, void *mem_ctx)
+{
+   char *stream_data = NULL;
+   size_t stream_size = 0;
+   struct u_memstream mem;
+   if (u_memstream_open(&mem, &stream_data, &stream_size)) {
+      FILE *const stream = u_memstream_get(&mem);
+      nir_print_shader(nir, stream);
+      u_memstream_close(&mem);
+   }
+
+   char *str = ralloc_size(mem_ctx, stream_size + 1);
+   memcpy(str, stream_data, stream_size);
+   str[stream_size] = '\0';
+
+   free(stream_data);
+
+   return str;
+}
+
 void
 nir_print_instr(const nir_instr *instr, FILE *fp)
 {

src/intel/vulkan/anv_pipeline.c

@@ -1092,20 +1092,7 @@ anv_pipeline_add_executable(struct anv_pipeline *pipeline,
    if (stage->nir &&
        (pipeline->flags &
         VK_PIPELINE_CREATE_CAPTURE_INTERNAL_REPRESENTATIONS_BIT_KHR)) {
-      char *stream_data = NULL;
-      size_t stream_size = 0;
-      FILE *stream = open_memstream(&stream_data, &stream_size);
-
-      nir_print_shader(stage->nir, stream);
-
-      fclose(stream);
-
-      /* Copy it to a ralloc'd thing */
-      nir = ralloc_size(pipeline->mem_ctx, stream_size + 1);
-      memcpy(nir, stream_data, stream_size);
-      nir[stream_size] = 0;
-
-      free(stream_data);
+      nir = nir_shader_as_str(stage->nir, pipeline->mem_ctx);
    }
 
    char *disasm = NULL;