From 481615418a26568c3972daefaed7d583815e7191 Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@gmail.com>
Date: Fri, 3 Mar 2023 22:49:31 -0800
Subject: Implement getconstant

---
 lib/ruby_vm/mjit/insn_compiler.rb | 29 ++++++++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

(limited to 'lib/ruby_vm')

diff --git a/lib/ruby_vm/mjit/insn_compiler.rb b/lib/ruby_vm/mjit/insn_compiler.rb
index d245ff2ce2..8dca11e4cf 100644
--- a/lib/ruby_vm/mjit/insn_compiler.rb
+++ b/lib/ruby_vm/mjit/insn_compiler.rb
@@ -24,7 +24,7 @@ module RubyVM::MJIT
       asm.incr_counter(:mjit_insns_count)
       asm.comment("Insn: #{insn.name}")
 
-      # 70/101
+      # 71/101
       case insn.name
       when :nop then nop(jit, ctx, asm)
       when :getlocal then getlocal(jit, ctx, asm)
@@ -39,7 +39,7 @@ module RubyVM::MJIT
       when :getclassvariable then getclassvariable(jit, ctx, asm)
       # setclassvariable
       when :opt_getconstant_path then opt_getconstant_path(jit, ctx, asm)
-      # getconstant
+      when :getconstant then getconstant(jit, ctx, asm)
       # setconstant
       # getglobal
       # setglobal
@@ -495,7 +495,30 @@ module RubyVM::MJIT
       EndBlock
     end
 
-    # getconstant
+    # @param jit [RubyVM::MJIT::JITState]
+    # @param ctx [RubyVM::MJIT::Context]
+    # @param asm [RubyVM::MJIT::Assembler]
+    def getconstant(jit, ctx, asm)
+      id = jit.operand(0)
+
+      # vm_get_ev_const can raise exceptions.
+      jit_prepare_routine_call(jit, ctx, asm)
+
+      allow_nil_opnd = ctx.stack_pop(1)
+      klass_opnd = ctx.stack_pop(1)
+
+      asm.mov(C_ARGS[0], EC)
+      asm.mov(C_ARGS[1], klass_opnd)
+      asm.mov(C_ARGS[2], id)
+      asm.mov(C_ARGS[3], allow_nil_opnd)
+      asm.call(C.rb_vm_get_ev_const)
+
+      top = ctx.stack_push
+      asm.mov(top, C_RET)
+
+      KeepCompiling
+    end
+
     # setconstant
     # getglobal
     # setglobal
-- 
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