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|
use crate::core::*;
use crate::cruby::*;
use crate::yjit::yjit_enabled_p;
/// Primitive called in yjit.rb
/// Produce a string representing the disassembly for an ISEQ
#[no_mangle]
pub extern "C" fn rb_yjit_disasm_iseq(_ec: EcPtr, _ruby_self: VALUE, iseqw: VALUE) -> VALUE {
#[cfg(not(feature = "disasm"))]
{
let _ = iseqw;
return Qnil;
}
#[cfg(feature = "disasm")]
{
// TODO:
//if unsafe { CLASS_OF(iseqw) != rb_cISeq } {
// return Qnil;
//}
if !yjit_enabled_p() {
return Qnil;
}
// Get the iseq pointer from the wrapper
let iseq = unsafe { rb_iseqw_to_iseq(iseqw) };
let out_string = disasm_iseq(iseq);
return rust_str_to_ruby(&out_string);
}
}
#[cfg(feature = "disasm")]
fn disasm_iseq(iseq: IseqPtr) -> String {
let mut out = String::from("");
// Get a list of block versions generated for this iseq
let mut block_list = get_iseq_block_list(iseq);
// Get a list of codeblocks relevant to this iseq
let global_cb = crate::codegen::CodegenGlobals::get_inline_cb();
// Sort the blocks by increasing start addresses
block_list.sort_by(|a, b| {
use std::cmp::Ordering;
// Get the start addresses for each block
let addr_a = a.borrow().get_start_addr().unwrap().raw_ptr();
let addr_b = b.borrow().get_start_addr().unwrap().raw_ptr();
if addr_a < addr_b {
Ordering::Less
} else if addr_a == addr_b {
Ordering::Equal
} else {
Ordering::Greater
}
});
// Compute total code size in bytes for all blocks in the function
let mut total_code_size = 0;
for blockref in &block_list {
total_code_size += blockref.borrow().code_size();
}
// Initialize capstone
use capstone::prelude::*;
let cs = Capstone::new()
.x86()
.mode(arch::x86::ArchMode::Mode64)
.syntax(arch::x86::ArchSyntax::Intel)
.build()
.unwrap();
out.push_str(&format!("NUM BLOCK VERSIONS: {}\n", block_list.len()));
out.push_str(&format!(
"TOTAL INLINE CODE SIZE: {} bytes\n",
total_code_size
));
// For each block, sorted by increasing start address
for block_idx in 0..block_list.len() {
let block = block_list[block_idx].borrow();
let blockid = block.get_blockid();
let end_idx = block.get_end_idx();
let start_addr = block.get_start_addr().unwrap().raw_ptr();
let end_addr = block.get_end_addr().unwrap().raw_ptr();
let code_size = block.code_size();
// Write some info about the current block
let block_ident = format!(
"BLOCK {}/{}, ISEQ RANGE [{},{}), {} bytes ",
block_idx + 1,
block_list.len(),
blockid.idx,
end_idx,
code_size
);
out.push_str(&format!("== {:=<60}\n", block_ident));
// Disassemble the instructions
let code_slice = unsafe { std::slice::from_raw_parts(start_addr, code_size) };
let insns = cs.disasm_all(code_slice, start_addr as u64).unwrap();
// For each instruction in this block
for insn in insns.as_ref() {
// Comments for this block
if let Some(comment_list) = global_cb.comments_at(insn.address() as usize) {
for comment in comment_list {
out.push_str(&format!(" \x1b[1m# {}\x1b[0m\n", comment));
}
}
out.push_str(&format!(" {}\n", insn));
}
// If this is not the last block
if block_idx < block_list.len() - 1 {
// Compute the size of the gap between this block and the next
let next_block = block_list[block_idx + 1].borrow();
let next_start_addr = next_block.get_start_addr().unwrap().raw_ptr();
let gap_size = (next_start_addr as usize) - (end_addr as usize);
// Log the size of the gap between the blocks if nonzero
if gap_size > 0 {
out.push_str(&format!("... {} byte gap ...\n", gap_size));
}
}
}
return out;
}
/// Primitive called in yjit.rb
/// Produce a list of instructions compiled for an isew
#[no_mangle]
pub extern "C" fn rb_yjit_insns_compiled(_ec: EcPtr, _ruby_self: VALUE, iseqw: VALUE) -> VALUE {
{
// TODO:
//if unsafe { CLASS_OF(iseqw) != rb_cISeq } {
// return Qnil;
//}
if !yjit_enabled_p() {
return Qnil;
}
// Get the iseq pointer from the wrapper
let iseq = unsafe { rb_iseqw_to_iseq(iseqw) };
// Get the list of instructions compiled
let insn_vec = insns_compiled(iseq);
unsafe {
let insn_ary = rb_ary_new_capa((insn_vec.len() * 2) as i64);
// For each instruction compiled
for idx in 0..insn_vec.len() {
let op_name = &insn_vec[idx].0;
let insn_idx = insn_vec[idx].1;
let op_sym = rust_str_to_sym(&op_name);
// Store the instruction index and opcode symbol
rb_ary_store(
insn_ary,
(2 * idx + 0) as i64,
VALUE::fixnum_from_usize(insn_idx as usize),
);
rb_ary_store(insn_ary, (2 * idx + 1) as i64, op_sym);
}
insn_ary
}
}
}
fn insns_compiled(iseq: IseqPtr) -> Vec<(String, u32)> {
let mut insn_vec = Vec::new();
// Get a list of block versions generated for this iseq
let block_list = get_iseq_block_list(iseq);
// For each block associated with this iseq
for blockref in &block_list {
let block = blockref.borrow();
let start_idx = block.get_blockid().idx;
let end_idx = block.get_end_idx();
assert!(end_idx <= unsafe { get_iseq_encoded_size(iseq) });
// For each YARV instruction in the block
let mut insn_idx = start_idx;
while insn_idx < end_idx {
// Get the current pc and opcode
let pc = unsafe { rb_iseq_pc_at_idx(iseq, insn_idx) };
// try_into() call below is unfortunate. Maybe pick i32 instead of usize for opcodes.
let opcode: usize = unsafe { rb_iseq_opcode_at_pc(iseq, pc) }
.try_into()
.unwrap();
// Get the mnemonic for this opcode
let op_name = insn_name(opcode);
// Add the instruction to the list
insn_vec.push((op_name, insn_idx));
// Move to the next instruction
insn_idx += insn_len(opcode);
}
}
return insn_vec;
}
|
