YJIT: Delete stale `frozen_bytes` related code (#7423)

The code and comments in there have been disabled by comments for a long
time. The issues that the counter used to solve are now solved more
comprehensively by "runningness" [tracking][1] introduced by Code GC
and [delayed deallocation][2].

Having a single counter doesn't fit our current model where code pages
that could be touched or not are interleaved, anyway.

Just delete the code.

[1]: e7c71c6c9271b0c29f210769159090e17128e740
[2]: a0b0365e905e1ac51998ace7e6fc723406a2f157

1 files changed, 0 insertions, 17 deletions

diff --git a/yjit/src/core.rs b/yjit/src/core.rs
index c364072ea1..edae7a58d7 100644
--- a/yjit/src/core.rs
+++ b/yjit/src/core.rs
@@ -1820,14 +1820,6 @@ pub fn gen_entry_point(iseq: IseqPtr, ec: EcPtr) -> Option<CodePtr> {
 
 /// Generate code for a branch, possibly rewriting and changing the size of it
 fn regenerate_branch(cb: &mut CodeBlock, branch: &mut Branch) {
-    // FIXME
-    /*
-    if (branch->start_addr < cb_get_ptr(cb, yjit_codepage_frozen_bytes)) {
-        // Generating this branch would modify frozen bytes. Do nothing.
-        return;
-    }
-    */
-
     // Remove old comments
     if let (Some(start_addr), Some(end_addr)) = (branch.start_addr, branch.end_addr) {
         cb.remove_comments(start_addr, end_addr)
@@ -2425,9 +2417,6 @@ pub fn invalidate_block_version(blockref: &BlockRef) {
             // Some blocks exit on entry. Patching a jump to the entry at the
             // entry makes an infinite loop.
         } else {
-            // TODO(alan)
-            // if (block.start_addr >= cb_get_ptr(cb, yjit_codepage_frozen_bytes)) // Don't patch frozen code region
-
             // Patch in a jump to block.entry_exit.
 
             let cur_pos = cb.get_write_ptr();
@@ -2468,12 +2457,6 @@ pub fn invalidate_block_version(blockref: &BlockRef) {
             assert_eq!(blockref, incoming_block);
         }
 
-        // TODO(alan):
-        // Don't patch frozen code region
-        // if (branch.start_addr < cb_get_ptr(cb, yjit_codepage_frozen_bytes)) {
-        //     continue;
-        // }
-
         // Create a stub for this branch target or rewire it to a valid block
         set_branch_target(target_idx as u32, block.blockid, &block.ctx, branchref, &mut branch, ocb);