hw/core/cpu: Return static value with gdb_arch_name()

All implementations of gdb_arch_name() returns dynamic duplicates of
static strings. It's also unlikely that there will be an implementation
of gdb_arch_name() that returns a truly dynamic value due to the nature
of the function returning a well-known identifiers. Qualify the value
gdb_arch_name() with const and make all of its implementations return
static strings.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20230912224107.29669-8-akihiko.odaki@daynix.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20231009164104.369749-15-alex.bennee@linaro.org>

gdbstub/gdbstub.c

@@ -380,10 +380,9 @@ static const char *get_feature_xml(const char *p, const char **newp,
                             "<target>");
 
             if (cc->gdb_arch_name) {
-                g_autofree gchar *arch = cc->gdb_arch_name(cpu);
                 g_string_append_printf(xml,
                                        "<architecture>%s</architecture>",
-                                       arch);
+                                       cc->gdb_arch_name(cpu));
             }
             g_string_append(xml, "<xi:include href=\"");
             g_string_append(xml, cc->gdb_core_xml_file);

include/hw/core/cpu.h

@@ -165,7 +165,7 @@ struct CPUClass {
     vaddr (*gdb_adjust_breakpoint)(CPUState *cpu, vaddr addr);
 
     const char *gdb_core_xml_file;
-    gchar * (*gdb_arch_name)(CPUState *cpu);
+    const gchar * (*gdb_arch_name)(CPUState *cpu);
     const char * (*gdb_get_dynamic_xml)(CPUState *cpu, const char *xmlname);
 
     void (*disas_set_info)(CPUState *cpu, disassemble_info *info);

target/arm/cpu.c

@@ -2319,15 +2319,15 @@ static Property arm_cpu_properties[] = {
     DEFINE_PROP_END_OF_LIST()
 };
 
-static gchar *arm_gdb_arch_name(CPUState *cs)
+static const gchar *arm_gdb_arch_name(CPUState *cs)
 {
     ARMCPU *cpu = ARM_CPU(cs);
     CPUARMState *env = &cpu->env;
 
     if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
-        return g_strdup("iwmmxt");
+        return "iwmmxt";
     }
-    return g_strdup("arm");
+    return "arm";
 }
 
 #ifndef CONFIG_USER_ONLY

target/arm/cpu64.c

@@ -781,9 +781,9 @@ static void aarch64_cpu_finalizefn(Object *obj)
 {
 }
 
-static gchar *aarch64_gdb_arch_name(CPUState *cs)
+static const gchar *aarch64_gdb_arch_name(CPUState *cs)
 {
-    return g_strdup("aarch64");
+    return "aarch64";
 }
 
 static void aarch64_cpu_class_init(ObjectClass *oc, void *data)

target/i386/cpu.c

@@ -5916,12 +5916,12 @@ static void x86_cpu_load_model(X86CPU *cpu, X86CPUModel *model)
     memset(&env->user_features, 0, sizeof(env->user_features));
 }
 
-static gchar *x86_gdb_arch_name(CPUState *cs)
+static const gchar *x86_gdb_arch_name(CPUState *cs)
 {
 #ifdef TARGET_X86_64
-    return g_strdup("i386:x86-64");
+    return "i386:x86-64";
 #else
-    return g_strdup("i386");
+    return "i386";
 #endif
 }
 

target/loongarch/cpu.c

@@ -766,9 +766,9 @@ static void loongarch_cpu_class_init(ObjectClass *c, void *data)
 #endif
 }
 
-static gchar *loongarch32_gdb_arch_name(CPUState *cs)
+static const gchar *loongarch32_gdb_arch_name(CPUState *cs)
 {
-    return g_strdup("loongarch32");
+    return "loongarch32";
 }
 
 static void loongarch32_cpu_class_init(ObjectClass *c, void *data)
@@ -780,9 +780,9 @@ static void loongarch32_cpu_class_init(ObjectClass *c, void *data)
     cc->gdb_arch_name = loongarch32_gdb_arch_name;
 }
 
-static gchar *loongarch64_gdb_arch_name(CPUState *cs)
+static const gchar *loongarch64_gdb_arch_name(CPUState *cs)
 {
-    return g_strdup("loongarch64");
+    return "loongarch64";
 }
 
 static void loongarch64_cpu_class_init(ObjectClass *c, void *data)

target/ppc/gdbstub.c

@@ -589,12 +589,12 @@ static int gdb_set_vsx_reg(CPUPPCState *env, uint8_t *mem_buf, int n)
     return 0;
 }
 
-gchar *ppc_gdb_arch_name(CPUState *cs)
+const gchar *ppc_gdb_arch_name(CPUState *cs)
 {
 #if defined(TARGET_PPC64)
-    return g_strdup("powerpc:common64");
+    return "powerpc:common64";
 #else
-    return g_strdup("powerpc:common");
+    return "powerpc:common";
 #endif
 }
 

target/ppc/internal.h

@@ -221,7 +221,7 @@ void destroy_ppc_opcodes(PowerPCCPU *cpu);
 
 /* gdbstub.c */
 void ppc_gdb_init(CPUState *cs, PowerPCCPUClass *ppc);
-gchar *ppc_gdb_arch_name(CPUState *cs);
+const gchar *ppc_gdb_arch_name(CPUState *cs);
 
 /**
  * prot_for_access_type:

target/riscv/cpu.c

@@ -2004,17 +2004,17 @@ static Property riscv_cpu_properties[] = {
     DEFINE_PROP_END_OF_LIST(),
 };
 
-static gchar *riscv_gdb_arch_name(CPUState *cs)
+static const gchar *riscv_gdb_arch_name(CPUState *cs)
 {
     RISCVCPU *cpu = RISCV_CPU(cs);
     CPURISCVState *env = &cpu->env;
 
     switch (riscv_cpu_mxl(env)) {
     case MXL_RV32:
-        return g_strdup("riscv:rv32");
+        return "riscv:rv32";
     case MXL_RV64:
     case MXL_RV128:
-        return g_strdup("riscv:rv64");
+        return "riscv:rv64";
     default:
         g_assert_not_reached();
     }

target/s390x/cpu.c

@@ -282,9 +282,9 @@ static void s390_cpu_initfn(Object *obj)
 #endif
 }
 
-static gchar *s390_gdb_arch_name(CPUState *cs)
+static const gchar *s390_gdb_arch_name(CPUState *cs)
 {
-    return g_strdup("s390:64-bit");
+    return "s390:64-bit";
 }
 
 static Property s390x_cpu_properties[] = {

target/tricore/cpu.c

@@ -29,9 +29,9 @@ static inline void set_feature(CPUTriCoreState *env, int feature)
     env->features |= 1ULL << feature;
 }
 
-static gchar *tricore_gdb_arch_name(CPUState *cs)
+static const gchar *tricore_gdb_arch_name(CPUState *cs)
 {
-    return g_strdup("tricore");
+    return "tricore";
 }
 
 static void tricore_cpu_set_pc(CPUState *cs, vaddr value)