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ZJIT: Precise GC writebarriers

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This issues writebarriers for objects added via gc_offsets or by
profiling. This may be slower than writebarrier_remember, but we would
like it to be more debuggable.

Co-authored-by: Max Bernstein <ruby@bernsteinbear.com>
Co-authored-by: Stan Lo <stan001212@gmail.com>
This commit is contained in:
John Hawthorn 2025-07-17 10:05:12 -07:00
parent 39b844e064
commit cb33f22f5b
3 changed files with 24 additions and 8 deletions
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8
zjit/src/codegen.rs
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@ -4,7 +4,7 @@ use std::rc::Rc;
use crate::asm::Label;
use crate::backend::current::{Reg, ALLOC_REGS};
use crate::invariants::track_bop_assumption;
use crate::gc::get_or_create_iseq_payload;
use crate::gc::{get_or_create_iseq_payload, append_gc_offsets};
use crate::state::ZJITState;
use crate::{asm::CodeBlock, cruby::*, options::debug, virtualmem::CodePtr};
use crate::backend::lir::{self, asm_comment, asm_ccall, Assembler, Opnd, SideExitContext, Target, CFP, C_ARG_OPNDS, C_RET_OPND, EC, NATIVE_STACK_PTR, SP};
@ -124,7 +124,7 @@ fn gen_iseq_entry_point_body(cb: &mut CodeBlock, iseq: IseqPtr) -> *const u8 {
// Remember the block address to reuse it later
let payload = get_or_create_iseq_payload(iseq);
payload.start_ptr = Some(start_ptr);
payload.gc_offsets.extend(gc_offsets);
append_gc_offsets(iseq, &gc_offsets);
// Compile an entry point to the JIT code
(gen_entry(cb, iseq, &function, start_ptr, jit.c_stack_bytes), jit.branch_iseqs)
@ -193,7 +193,7 @@ fn gen_iseq(cb: &mut CodeBlock, iseq: IseqPtr) -> Option<(CodePtr, Vec<(Rc<Branc
let result = gen_function(cb, iseq, &function);
if let Some((start_ptr, gc_offsets, jit)) = result {
payload.start_ptr = Some(start_ptr);
payload.gc_offsets.extend(gc_offsets);
append_gc_offsets(iseq, &gc_offsets);
Some((start_ptr, jit.branch_iseqs))
} else {
None
@ -999,7 +999,7 @@ fn gen_guard_type(jit: &mut JITState, asm: &mut Assembler, val: lir::Opnd, guard
/// Compile an identity check with a side exit
fn gen_guard_bit_equals(jit: &mut JITState, asm: &mut Assembler, val: lir::Opnd, expected: VALUE, state: &FrameState) -> Option<lir::Opnd> {
asm.cmp(val, Opnd::UImm(expected.into()));
asm.cmp(val, Opnd::Value(expected));
asm.jnz(side_exit(jit, state, GuardBitEquals(expected))?);
Some(val)
}