39e102b155
Not all br_icmp opcodes are present in the ISA. The missing ones can be reached by commuting operands. Don't attempt to encode EBB offsets yet. For now just emit an EBB relocation for the branch instruction.
45 lines
1.4 KiB
Rust
45 lines
1.4 KiB
Rust
//! Binary machine code emission.
|
|
//!
|
|
//! The `binemit` module contains code for translating Cretonne's intermediate representation into
|
|
//! binary machine code.
|
|
|
|
use ir::{Ebb, FuncRef, JumpTable, Function, Inst};
|
|
|
|
/// Relocation kinds depend on the current ISA.
|
|
pub struct Reloc(pub u16);
|
|
|
|
/// Abstract interface for adding bytes to the code segment.
|
|
///
|
|
/// A `CodeSink` will receive all of the machine code for a function. It also accepts relocations
|
|
/// which are locations in the code section that need to be fixed up when linking.
|
|
pub trait CodeSink {
|
|
/// Add 1 byte to the code section.
|
|
fn put1(&mut self, u8);
|
|
|
|
/// Add 2 bytes to the code section.
|
|
fn put2(&mut self, u16);
|
|
|
|
/// Add 4 bytes to the code section.
|
|
fn put4(&mut self, u32);
|
|
|
|
/// Add 8 bytes to the code section.
|
|
fn put8(&mut self, u64);
|
|
|
|
/// Add a relocation referencing an EBB at the current offset.
|
|
fn reloc_ebb(&mut self, Reloc, Ebb);
|
|
|
|
/// Add a relocation referencing an external function at the current offset.
|
|
fn reloc_func(&mut self, Reloc, FuncRef);
|
|
|
|
/// Add a relocation referencing a jump table.
|
|
fn reloc_jt(&mut self, Reloc, JumpTable);
|
|
}
|
|
|
|
/// Report a bad encoding error.
|
|
#[inline(never)]
|
|
pub fn bad_encoding(func: &Function, inst: Inst) -> ! {
|
|
panic!("Bad encoding {} for {}",
|
|
func.encodings[inst],
|
|
func.dfg.display_inst(inst));
|
|
}
|