r300: fix memory leaks when register allocation fails

For instance, this issue is triggered with
"piglit/bin/ext_framebuffer_multisample-accuracy all_samples color depthstencil -auto -fbo":
Direct leak of 1160 byte(s) in 1 object(s) allocated from:
    #0 0x7fbe8897d7ef in __interceptor_malloc (/usr/lib64/libasan.so.6+0xb17ef)
    #1 0x7fbe7e7abfcc in rc_constants_copy ../src/gallium/drivers/r300/compiler/radeon_code.c:47
    #2 0x7fbe7e7ec902 in r3xx_compile_fragment_program ../src/gallium/drivers/r300/compiler/r3xx_fragprog.c:174
    #3 0x7fbe7e7e1b22 in r300_translate_fragment_shader ../src/gallium/drivers/r300/r300_fs.c:516
    #4 0x7fbe7e7e6373 in r300_pick_fragment_shader ../src/gallium/drivers/r300/r300_fs.c:591
    #5 0x7fbe7e75456e in r300_create_fs_state ../src/gallium/drivers/r300/r300_state.c:1073
    #6 0x7fbe7cd2ebe5 in st_create_fp_variant ../src/mesa/state_tracker/st_program.c:1070
    #7 0x7fbe7cd374b5 in st_get_fp_variant ../src/mesa/state_tracker/st_program.c:1116
    #8 0x7fbe7cd38273 in st_precompile_shader_variant ../src/mesa/state_tracker/st_program.c:1281
    #9 0x7fbe7cd38273 in st_finalize_program ../src/mesa/state_tracker/st_program.c:1345
    #10 0x7fbe7d798ca8 in st_link_glsl_to_nir ../src/mesa/state_tracker/st_glsl_to_nir.cpp:724
    #11 0x7fbe7d798ca8 in st_link_shader ../src/mesa/state_tracker/st_glsl_to_nir.cpp:952
    #12 0x7fbe7d6790d5 in link_program ../src/mesa/main/shaderapi.c:1336
    #13 0x7fbe7d6790d5 in link_program_error ../src/mesa/main/shaderapi.c:1447
...
SUMMARY: AddressSanitizer: 2528456 byte(s) leaked in 1057 allocation(s).

Fixes: 54f6e72 ("r300: better register allocator for vertex shaders")
Signed-off-by: Patrick Lerda <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27792>
(cherry picked from commit 4d00edd)

Author: Patrick Lerda

.pick_status.json

@@ -1684,7 +1684,7 @@
         "description": "r300: fix memory leaks when register allocation fails",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": "54f6e72b27154219be237690453bb9c3b57cd3ec",
         "notes": null

src/gallium/drivers/r300/compiler/r3xx_vertprog.c

@@ -689,6 +689,7 @@ static void allocate_temporary_registers(struct radeon_compiler *c, void *user)
 
 	if (!ra_allocate(graph)) {
 		rc_error(c, "Ran out of hardware temporaries\n");
+                ralloc_free(graph);
 		return;
 	}
 

src/gallium/drivers/r300/compiler/radeon_pair_regalloc.c

@@ -357,6 +357,7 @@ static void do_advanced_regalloc(struct regalloc_state * s)
 
 	if (!ra_allocate(graph)) {
 		rc_error(s->C, "Ran out of hardware temporaries\n");
+                ralloc_free(graph);
 		return;
 	}
 

src/gallium/drivers/r300/r300_fs.c

@@ -525,6 +525,7 @@ static void r300_translate_fragment_shader(
             abort();
         }
 
+        free(compiler.code->constants.Constants);
         rc_destroy(&compiler.Base);
         r300_dummy_fragment_shader(r300, shader);
         return;