Struct JitContext 

#[repr(C)]
pub struct JitContext {

    pub regs: [u64; 13],
    pub gas: i64,
    pub exit_reason: u32,
    pub exit_arg: u32,
    pub heap_base: u32,
    pub heap_top: u32,
    pub jt_ptr: *const u32,
    pub jt_len: u32,
    pub _pad0: u32,
    pub bb_starts: *const u8,
    pub bb_len: u32,
    pub _pad1: u32,
    pub entry_pc: u32,
    pub pc: u32,
    pub dispatch_table: *const i32,
    pub code_base: u64,
    pub flat_buf: *mut u8,
    pub fast_reentry: u32,
    pub _pad2: u32,
    pub max_heap_pages: u32,
    pub _pad3: u32,
}

JIT execution context passed to compiled code via R15. Must be #[repr(C)] with exact field ordering matching the CTX_* offset constants in codegen.

Fields

regs: [u64; 13]

PVM registers (offset 0, 13 × 8 = 104 bytes).

gas: i64

Gas counter (offset 104). Signed to detect underflow.

exit_reason: u32

Exit reason code (offset 112).

exit_arg: u32

Exit argument (offset 116) — host call ID, page fault addr, etc.

heap_base: u32

Heap base address (offset 120).

heap_top: u32

Current heap top (offset 124).

jt_ptr: *const u32

Jump table pointer (offset 128).

jt_len: u32

Jump table length (offset 136).

_pad0: u32

bb_starts: *const u8

Basic block starts pointer (offset 144).

bb_len: u32

Basic block starts length (offset 152).

_pad1: u32

entry_pc: u32

Entry PC for re-entry after host calls (offset 160).

pc: u32

Current PC when execution stopped (offset 164).

dispatch_table: *const i32

Dispatch table: PVM PC → native code offset (offset 168).

code_base: u64

Base address of native code (offset 176).

flat_buf: *mut u8

Flat guest memory buffer base pointer (offset 184).

fast_reentry: u32

Fast re-entry flag.

_pad2: u32

max_heap_pages: u32

Maximum heap pages — grow_heap refuses beyond this.

_pad3: u32