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tests/plugins: extend the insn plugin to track opcode sizes

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This is mostly a convenience feature for identifying frontends that do
multiple repeat loads so I can test changes to the instruction
tracking interface.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20211026102234.3961636-20-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2021-10-26 11:22:25 +01:00
parent a00e37a4be
commit e83f79b3fa
1 changed files with 35 additions and 2 deletions
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37
tests/plugin/insn.c
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@ -18,6 +18,8 @@ QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
static uint64_t insn_count;
static bool do_inline;
static bool do_size;
static GArray *sizes;
static void vcpu_insn_exec_before(unsigned int cpu_index, void *udata)
{
@ -49,13 +51,35 @@ static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
insn, vcpu_insn_exec_before, QEMU_PLUGIN_CB_NO_REGS,
GUINT_TO_POINTER(vaddr));
}
if (do_size) {
size_t sz = qemu_plugin_insn_size(insn);
if (sz > sizes->len) {
g_array_set_size(sizes, sz);
}
unsigned long *cnt = &g_array_index(sizes, unsigned long, sz);
(*cnt)++;
}
}
}
static void plugin_exit(qemu_plugin_id_t id, void *p)
{
g_autofree gchar *out = g_strdup_printf("insns: %" PRIu64 "\n", insn_count);
qemu_plugin_outs(out);
g_autoptr(GString) out = g_string_new(NULL);
if (do_size) {
int i;
for (i = 0; i <= sizes->len; i++) {
unsigned long *cnt = &g_array_index(sizes, unsigned long, i);
if (*cnt) {
g_string_append_printf(out,
"len %d bytes: %ld insns\n", i, *cnt);
}
}
} else {
g_string_append_printf(out, "insns: %" PRIu64 "\n", insn_count);
}
qemu_plugin_outs(out->str);
}
QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
@ -70,12 +94,21 @@ QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
return -1;
}
} else if (g_strcmp0(tokens[0], "sizes") == 0) {
if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_size)) {
fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
return -1;
}
} else {
fprintf(stderr, "option parsing failed: %s\n", opt);
return -1;
}
}
if (do_size) {
sizes = g_array_new(true, true, sizeof(unsigned long));
}
qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
return 0;