contrib/elf2dmp: Use GPtrArray

This removes the need to enumarate QEMUCPUState twice and saves code.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Tested-by: Viktor Prutyanov <viktor.prutyanov@phystech.edu>
Message-id: 20240307-elf2dmp-v4-17-4f324ad4d99d@daynix.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

contrib/elf2dmp/qemu_elf.c

@@ -66,46 +66,37 @@ static bool init_states(QEMU_Elf *qe)
     Elf64_Nhdr *start = (void *)((uint8_t *)qe->map + phdr[0].p_offset);
     Elf64_Nhdr *end = (void *)((uint8_t *)start + phdr[0].p_memsz);
     Elf64_Nhdr *nhdr;
-    size_t cpu_nr = 0;
+    GPtrArray *states;
 
     if (phdr[0].p_type != PT_NOTE) {
         eprintf("Failed to find PT_NOTE\n");
         return false;
     }
 
     qe->has_kernel_gs_base = 1;
+    states = g_ptr_array_new();
 
     for (nhdr = start; nhdr < end; nhdr = nhdr_get_next(nhdr)) {
         if (!strcmp(nhdr_get_name(nhdr), QEMU_NOTE_NAME)) {
             QEMUCPUState *state = nhdr_get_desc(nhdr);
 
             if (state->size < sizeof(*state)) {
-                eprintf("CPU #%zu: QEMU CPU state size %u doesn't match\n",
-                        cpu_nr, state->size);
+                eprintf("CPU #%u: QEMU CPU state size %u doesn't match\n",
+                        states->len, state->size);
                 /*
                  * We assume either every QEMU CPU state has KERNEL_GS_BASE or
                  * no one has.
                  */
                 qe->has_kernel_gs_base = 0;
             }
-            cpu_nr++;
+            g_ptr_array_add(states, state);
         }
     }
 
-    printf("%zu CPU states has been found\n", cpu_nr);
+    printf("%u CPU states has been found\n", states->len);
 
-    qe->state = g_new(QEMUCPUState*, cpu_nr);
-
-    cpu_nr = 0;
-
-    for (nhdr = start; nhdr < end; nhdr = nhdr_get_next(nhdr)) {
-        if (!strcmp(nhdr_get_name(nhdr), QEMU_NOTE_NAME)) {
-            qe->state[cpu_nr] = nhdr_get_desc(nhdr);
-            cpu_nr++;
-        }
-    }
-
-    qe->state_nr = cpu_nr;
+    qe->state_nr = states->len;
+    qe->state = (void *)g_ptr_array_free(states, FALSE);
 
     return true;
 }