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authoriximeow <me@iximeow.net>2020-01-15 20:20:55 -0800
committeriximeow <me@iximeow.net>2020-01-15 20:20:55 -0800
commit10b7f6d581f04b284a8308d4c1c82a59dae36a6b (patch)
treefd8baa1b42f0d7d1acc968102f1d9f21b9b02106 /ffi/src/lib.rs
parentd0e662b146aad03044d933caf2c2c16d7863c5d5 (diff)
avoid needing to dynamically allocate in yaxpeax-x86 ffi
this makes ffi builds also no-std, and significantly smaller too
Diffstat (limited to 'ffi/src/lib.rs')
-rw-r--r--ffi/src/lib.rs64
1 files changed, 38 insertions, 26 deletions
diff --git a/ffi/src/lib.rs b/ffi/src/lib.rs
index 12e077b..9d726d2 100644
--- a/ffi/src/lib.rs
+++ b/ffi/src/lib.rs
@@ -1,43 +1,55 @@
-use yaxpeax_arch::{Arch, Decoder, LengthedInstruction, Address};
+#![no_std]
+#![feature(lang_items)]
+
+#[panic_handler]
+#[cold]
+fn panic(panic: &core::panic::PanicInfo) -> ! {
+ loop {}
+}
+
+#[lang = "eh_personality"] extern fn eh_personality() {}
+
+use yaxpeax_arch::{Arch, Decoder, LengthedInstruction, Address, AddressBase};
use yaxpeax_x86::x86_64;
-use std::fmt::Write;
+use core::fmt::Write;
#[no_mangle]
-pub unsafe extern "C" fn yaxpeax_decode_x86_64_optimistic(data: *const std::os::raw::c_char, length: std::os::raw::c_longlong, inst: *mut yaxpeax_x86::Instruction) -> bool {
- let inst: &mut yaxpeax_x86::Instruction = std::mem::transmute(inst);
- <x86_64 as Arch>::Decoder::default().decode_into(inst, std::slice::from_raw_parts(data as *const u8, length as usize).iter().cloned()).is_err()
+pub unsafe extern "C" fn yaxpeax_decode_x86_64_optimistic(data: *const u8, length: u64, inst: *mut yaxpeax_x86::Instruction) -> bool {
+ let inst: &mut yaxpeax_x86::Instruction = core::mem::transmute(inst);
+ <x86_64 as Arch>::Decoder::default().decode_into(inst, core::slice::from_raw_parts(data as *const u8, length as usize).iter().cloned()).is_err()
}
#[no_mangle]
pub unsafe extern "C" fn yaxpeax_instr_length_x86_64(inst: *mut yaxpeax_x86::Instruction) -> usize {
- let inst: &mut yaxpeax_x86::Instruction = std::mem::transmute(inst);
+ let inst: &mut yaxpeax_x86::Instruction = core::mem::transmute(inst);
inst.len().to_linear()
}
-#[no_mangle]
-pub unsafe extern "C" fn yaxpeax_instr_fmt(inst: *mut yaxpeax_x86::Instruction, size: *mut u64, capacity: *mut u64) -> *mut u8 {
- let inst: &mut yaxpeax_x86::Instruction = std::mem::transmute(inst);
- let mut res = String::with_capacity(128);
-
- write!(res, "{}", inst).unwrap();
-
- let mut bytes = res.into_bytes();
- let ptr = bytes.as_mut_ptr();
- *capacity = bytes.capacity() as u64;
- *size = bytes.len() as u64;
- std::mem::forget(bytes);
- ptr
+struct InstructionSink<'buf> {
+ buf: &'buf mut [u8],
+ offs: usize,
}
-#[no_mangle]
-pub unsafe extern "C" fn yaxpeax_instr_x86_64_blank() -> *mut yaxpeax_x86::Instruction {
- Box::leak(Box::new(yaxpeax_x86::Instruction::invalid()))
+impl<'a> core::fmt::Write for InstructionSink<'a> {
+ fn write_str(&mut self, s: &str) -> core::fmt::Result {
+ for b in s.bytes() {
+ if self.offs < self.buf.len() {
+ self.buf[self.offs] = b;
+ self.offs += 1;
+ } else {
+ break;
+ }
+ }
+
+ Ok(())
+ }
}
#[no_mangle]
-pub unsafe extern "C" fn yaxpeax_str_drop(data: *mut u8, size: u64, capacity: u64) {
- std::mem::drop(
- Vec::from_raw_parts(data, size as usize, capacity as usize)
- );
+pub unsafe extern "C" fn yaxpeax_instr_fmt(inst: *mut yaxpeax_x86::Instruction, text: *mut u8, len: usize) {
+ let inst: &mut yaxpeax_x86::Instruction = core::mem::transmute(inst);
+ let mut res = core::slice::from_raw_parts_mut(text, len);
+
+ write!(InstructionSink { buf: res, offs: 0 }, "{}", inst).unwrap();
}