From a994b0aee73a78de1137f195fb252b3660199f0b Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@gmail.com>
Date: Sat, 28 Dec 2019 00:44:09 -0800
Subject: [PATCH] Add VM insns counter like debug_counter (#2789)

---
 vm_exec.c | 30 ++++++++++++++++++++++++++++++
 vm_exec.h |  7 ++++++-
 2 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/vm_exec.c b/vm_exec.c
index 0adaa7b721..2c7e22228a 100644
--- a/vm_exec.c
+++ b/vm_exec.c
@@ -15,6 +15,36 @@
 static void vm_analysis_insn(int insn);
 #endif
 
+#if USE_INSNS_COUNTER
+static size_t rb_insns_counter[VM_INSTRUCTION_SIZE];
+
+static void
+vm_insns_counter_count_insn(int insn)
+{
+    rb_insns_counter[insn]++;
+}
+
+__attribute__((destructor))
+static void
+vm_insns_counter_show_results_at_exit(void)
+{
+    int insn_end = (ruby_vm_event_enabled_global_flags & ISEQ_TRACE_EVENTS)
+        ? VM_INSTRUCTION_SIZE : VM_INSTRUCTION_SIZE / 2;
+
+    size_t total = 0;
+    for (int insn = 0; insn < insn_end; insn++)
+        total += rb_insns_counter[insn];
+
+    for (int insn = 0; insn < insn_end; insn++) {
+        fprintf(stderr, "[RUBY_INSNS_COUNTER]\t%-32s%'12"PRIuSIZE" (%4.1f%%)\n",
+                insn_name(insn), rb_insns_counter[insn],
+                100.0 * rb_insns_counter[insn] / total);
+    }
+}
+#else
+static void vm_insns_counter_count_insn(int insn) {}
+#endif
+
 #if VMDEBUG > 0
 #define DECL_SC_REG(type, r, reg) register type reg_##r
 
diff --git a/vm_exec.h b/vm_exec.h
index 9c8b42371d..86a70fe8ad 100644
--- a/vm_exec.h
+++ b/vm_exec.h
@@ -41,6 +41,10 @@ typedef rb_iseq_t *ISEQ;
 #define throwdebug if(0)printf
 /* #define throwdebug printf */
 
+#ifndef USE_INSNS_COUNTER
+#define USE_INSNS_COUNTER 0
+#endif
+
 /************************************************/
 #if defined(DISPATCH_XXX)
 error !
@@ -75,7 +79,8 @@ error !
                  (reg_pc - reg_cfp->iseq->body->iseq_encoded), \
                  (reg_cfp->pc - reg_cfp->iseq->body->iseq_encoded), \
                  RSTRING_PTR(rb_iseq_path(reg_cfp->iseq)), \
-                 rb_iseq_line_no(reg_cfp->iseq, reg_pc - reg_cfp->iseq->body->iseq_encoded));
+                 rb_iseq_line_no(reg_cfp->iseq, reg_pc - reg_cfp->iseq->body->iseq_encoded)); \
+  if (USE_INSNS_COUNTER) vm_insns_counter_count_insn(BIN(insn));
 
 #define INSN_DISPATCH_SIG(insn)