Support --zjit-dump-disasm

Merged: https://github.com/ruby/ruby/pull/13131

zjit/src/lib.rs

@@ -14,6 +14,7 @@ mod options;
 
 use backend::x86_emit;
 use codegen::ZJITState;
+use options::get_option;
 use crate::cruby::*;
 
 #[allow(non_upper_case_globals)]
@@ -87,7 +88,7 @@ pub extern "C" fn rb_zjit_iseq_gen_entry_point(iseq: IseqPtr, _ec: EcPtr) -> *co
 
         use disasm::disasm_addr_range;
         let disasm = disasm_addr_range(start_ptr.raw_ptr(cb) as usize, end_ptr.raw_ptr(cb) as usize);
-        if false { // TODO: implement the option
+        if get_option!(dump_disasm) {
             println!("{}", disasm);
         }
     }

zjit/src/options.rs

@@ -6,6 +6,19 @@ pub struct Options {
     pub dump_disasm: bool,
 }
 
+/// Macro to get an option value by name
+macro_rules! get_option {
+    // Unsafe is ok here because options are initialized
+    // once before any Ruby code executes
+    ($option_name:ident) => {
+        {
+            use crate::codegen::ZJITState;
+            ZJITState::get_options().$option_name
+        }
+    };
+}
+pub(crate) use get_option;
+
 /// Allocate Options on the heap, initialize it, and return the address of it.
 /// The return value will be modified by rb_zjit_parse_option() and then
 /// passed to rb_zjit_init() for initialization.