https://git.ruby-lang.org/ruby.git/commit/?id=93f6ac39f2

From 93f6ac39f20f64a879507db98a16177530e9f3d4 Mon Sep 17 00:00:00 2001
From: Alan Wu <XrXr@u...>
Date: Mon, 19 Oct 2020 09:47:39 -0400
Subject: MicroJIT: Don't compile trace instructions

---
 iseq.c         | 19 +++++++++++++++++++
 iseq.h         |  2 ++
 ujit_compile.c |  2 +-
 3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/iseq.c b/iseq.c
index 971f1c54c7..6b8f3d0e2c 100644
--- a/iseq.c
+++ b/iseq.c
@@ -3232,6 +3232,25 @@ rb_vm_insn_addr2insn(const void *addr) https://github.com/ruby/ruby/blob/trunk/iseq.c#L3232
     rb_bug("rb_vm_insn_addr2insn: invalid insn address: %p", addr);
 }
 
+// Unlike rb_vm_insn_addr2insn, this function can return trace opcode variants.
+int
+rb_vm_insn_addr2opcode(const void *addr)
+{
+    st_data_t key = (st_data_t)addr;
+    st_data_t val;
+
+    if (st_lookup(rb_encoded_insn_data, key, &val)) {
+        insn_data_t *e = (insn_data_t *)val;
+        int opcode = e->insn;
+        if (addr == e->trace_encoded_insn) {
+            opcode += VM_INSTRUCTION_SIZE/2;
+        }
+        return opcode;
+    }
+
+    rb_bug("rb_vm_insn_addr2opcode: invalid insn address: %p", addr);
+}
+
 // Decode `iseq->body->iseq_encoded[i]` to an insn.
 int
 rb_vm_insn_decode(const VALUE encoded)
diff --git a/iseq.h b/iseq.h
index ace5a45ba3..9b5eb138ad 100644
--- a/iseq.h
+++ b/iseq.h
@@ -167,6 +167,8 @@ const rb_iseq_t *rb_iseq_load_iseq(VALUE fname); https://github.com/ruby/ruby/blob/trunk/iseq.h#L167
 unsigned int *rb_iseq_insns_info_decode_positions(const struct rb_iseq_constant_body *body);
 #endif
 
+int rb_vm_insn_addr2opcode(const void *addr);
+
 RUBY_SYMBOL_EXPORT_BEGIN
 
 /* compile.c */
diff --git a/ujit_compile.c b/ujit_compile.c
index 1d349b5664..f922088bcc 100644
--- a/ujit_compile.c
+++ b/ujit_compile.c
@@ -74,7 +74,7 @@ opcode_at_pc(const rb_iseq_t *iseq, const VALUE *pc) https://github.com/ruby/ruby/blob/trunk/ujit_compile.c#L74
 {
     const VALUE at_pc = *pc;
     if (FL_TEST_RAW((VALUE)iseq, ISEQ_TRANSLATED)) {
-        return rb_vm_insn_addr2insn((const void *)at_pc);
+        return rb_vm_insn_addr2opcode((const void *)at_pc);
     }
     else {
         return (int)at_pc;
-- 
cgit v1.2.1


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