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-rw-r--r--src/display.rs56
-rw-r--r--src/lib.rs2
-rw-r--r--src/long_mode/display.rs17
-rw-r--r--src/long_mode/mod.rs2
4 files changed, 72 insertions, 5 deletions
diff --git a/src/display.rs b/src/display.rs
index e495aee..9b72cb3 100644
--- a/src/display.rs
+++ b/src/display.rs
@@ -211,6 +211,11 @@ impl<'buf> fmt::Write for InstructionTextSink<'buf> {
self.buf.write_str(s)
}
fn write_char(&mut self, c: char) -> Result<(), core::fmt::Error> {
+ if cfg!(debug_assertions) {
+ if self.buf.capacity() < self.buf.len() + 1 {
+ panic!("InstructionTextSink::write_char would overflow output");
+ }
+ }
// SAFETY: `buf` is assumed to be long enough to hold all input, `buf` at `underlying.len()`
// is valid for writing, but may be uninitialized.
//
@@ -640,6 +645,12 @@ impl DisplaySink for alloc::string::String {
impl<'buf> DisplaySink for InstructionTextSink<'buf> {
#[inline(always)]
fn write_fixed_size(&mut self, s: &str) -> Result<(), core::fmt::Error> {
+ if cfg!(debug_assertions) {
+ if self.buf.capacity() < self.buf.len() + s.len() {
+ panic!("InstructionTextSink::write_fixed_size would overflow output");
+ }
+ }
+
let buf = unsafe { self.buf.as_mut_vec() };
let new_bytes = s.as_bytes();
@@ -671,6 +682,12 @@ impl<'buf> DisplaySink for InstructionTextSink<'buf> {
Ok(())
}
unsafe fn write_lt_32(&mut self, s: &str) -> Result<(), fmt::Error> {
+ if cfg!(debug_assertions) {
+ if self.buf.capacity() < self.buf.len() + s.len() {
+ panic!("InstructionTextSink::write_lt_32 would overflow output");
+ }
+ }
+
// SAFETY: todo
let buf = unsafe { self.buf.as_mut_vec() };
let new_bytes = s.as_bytes();
@@ -745,6 +762,12 @@ impl<'buf> DisplaySink for InstructionTextSink<'buf> {
Ok(())
}
unsafe fn write_lt_16(&mut self, s: &str) -> Result<(), fmt::Error> {
+ if cfg!(debug_assertions) {
+ if self.buf.capacity() < self.buf.len() + s.len() {
+ panic!("InstructionTextSink::write_lt_16 would overflow output");
+ }
+ }
+
// SAFETY: todo
let buf = unsafe { self.buf.as_mut_vec() };
let new_bytes = s.as_bytes();
@@ -810,6 +833,12 @@ impl<'buf> DisplaySink for InstructionTextSink<'buf> {
Ok(())
}
unsafe fn write_lt_8(&mut self, s: &str) -> Result<(), fmt::Error> {
+ if cfg!(debug_assertions) {
+ if self.buf.capacity() < self.buf.len() + s.len() {
+ panic!("InstructionTextSink::write_lt_8 would overflow output");
+ }
+ }
+
// SAFETY: todo
let buf = unsafe { self.buf.as_mut_vec() };
let new_bytes = s.as_bytes();
@@ -881,6 +910,12 @@ impl<'buf> DisplaySink for InstructionTextSink<'buf> {
// means we can write directly into the correct offsets of the output string.
let printed_size = ((8 - v.leading_zeros() + 3) >> 2) as usize;
+ if cfg!(debug_assertions) {
+ if self.buf.capacity() < self.buf.len() + printed_size {
+ panic!("InstructionTextSink::write_u8 would overflow output");
+ }
+ }
+
let buf = unsafe { self.buf.as_mut_vec() };
let new_len = buf.len() + printed_size;
@@ -914,10 +949,17 @@ impl<'buf> DisplaySink for InstructionTextSink<'buf> {
if v == 0 {
return self.write_fixed_size("0");
}
+
// we can fairly easily predict the size of a formatted string here with lzcnt, which also
// means we can write directly into the correct offsets of the output string.
let printed_size = ((16 - v.leading_zeros() + 3) >> 2) as usize;
+ if cfg!(debug_assertions) {
+ if self.buf.capacity() < self.buf.len() + printed_size {
+ panic!("InstructionTextSink::write_u16 would overflow output");
+ }
+ }
+
let buf = unsafe { self.buf.as_mut_vec() };
let new_len = buf.len() + printed_size;
@@ -951,10 +993,17 @@ impl<'buf> DisplaySink for InstructionTextSink<'buf> {
if v == 0 {
return self.write_fixed_size("0");
}
+
// we can fairly easily predict the size of a formatted string here with lzcnt, which also
// means we can write directly into the correct offsets of the output string.
let printed_size = ((32 - v.leading_zeros() + 3) >> 2) as usize;
+ if cfg!(debug_assertions) {
+ if self.buf.capacity() < self.buf.len() + printed_size {
+ panic!("InstructionTextSink::write_u32 would overflow output");
+ }
+ }
+
let buf = unsafe { self.buf.as_mut_vec() };
let new_len = buf.len() + printed_size;
@@ -988,10 +1037,17 @@ impl<'buf> DisplaySink for InstructionTextSink<'buf> {
if v == 0 {
return self.write_fixed_size("0");
}
+
// we can fairly easily predict the size of a formatted string here with lzcnt, which also
// means we can write directly into the correct offsets of the output string.
let printed_size = ((64 - v.leading_zeros() + 3) >> 2) as usize;
+ if cfg!(debug_assertions) {
+ if self.buf.capacity() < self.buf.len() + printed_size {
+ panic!("InstructionTextSink::write_u64 would overflow output");
+ }
+ }
+
let buf = unsafe { self.buf.as_mut_vec() };
let new_len = buf.len() + printed_size;
diff --git a/src/lib.rs b/src/lib.rs
index 709563b..491b6f0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -140,7 +140,7 @@ pub use real_mode::Arch as x86_16;
mod safer_unchecked;
#[cfg(feature = "fmt")]
-mod display;
+pub mod display;
const MEM_SIZE_STRINGS: [&'static str; 65] = [
"BUG",
diff --git a/src/long_mode/display.rs b/src/long_mode/display.rs
index d9799e1..3615538 100644
--- a/src/long_mode/display.rs
+++ b/src/long_mode/display.rs
@@ -4303,6 +4303,7 @@ impl <T: fmt::Write, Y: YaxColors> ShowContextual<u64, [Option<alloc::string::St
}
}
+// TODO: should include CALL
static RELATIVE_BRANCHES: [Opcode; 21] = [
Opcode::JMP, Opcode::JRCXZ,
Opcode::LOOP, Opcode::LOOPZ, Opcode::LOOPNZ,
@@ -4474,12 +4475,13 @@ impl<'a, F: DisplaySink> crate::long_mode::OperandVisitor for RelativeBranchPrin
/// ```
/// use yaxpeax_x86::long_mode::InstDecoder;
/// use yaxpeax_x86::long_mode::InstructionTextBuffer;
+/// use yaxpeax_x86::long_mode::DisplayStyle;
///
/// let bytes = &[0x33, 0xc0];
/// let inst = InstDecoder::default().decode_slice(bytes).expect("can decode");
/// let mut text_buf = InstructionTextBuffer::new();
/// assert_eq!(
-/// text_buf.format_inst(&inst).expect("can format"),
+/// text_buf.format_inst(&inst.display_with(DisplayStyle::Intel)).expect("can format"),
/// "xor eax, eax"
/// );
///
@@ -4511,7 +4513,9 @@ impl InstructionTextBuffer {
/// this clears and reuses an internal buffer; if an instruction had been previously formatted
/// through this buffer, it will be overwritten.
pub fn format_inst<'buf, 'instr>(&'buf mut self, display: &InstructionDisplayer<'instr>) -> Result<&'buf str, fmt::Error> {
- let mut handle = self.write_handle();
+ // Safety: this sink is used to format exactly one instruction and then dropped. it can
+ // never escape `format_inst`.
+ let mut handle = unsafe { self.write_handle() };
match display.style {
DisplayStyle::Intel => {
@@ -4531,8 +4535,15 @@ impl InstructionTextBuffer {
self.content.as_str()
}
- fn write_handle(&mut self) -> crate::display::InstructionTextSink {
+ /// do the necessary bookkeeping and provide an `InstructionTextSink` to write an instruction
+ /// into.
+ ///
+ /// SAFETY: callers must print at most one instruction into this handle.
+ unsafe fn write_handle(&mut self) -> crate::display::InstructionTextSink {
self.content.clear();
+ // Safety: `content` was just cleared, so writing begins at the start of the buffer.
+ // `content`is large enough to hold a fully-formatted instruction (see
+ // `InstructionTextBuffer::new`).
crate::display::InstructionTextSink::new(&mut self.content)
}
}
diff --git a/src/long_mode/mod.rs b/src/long_mode/mod.rs
index 418d57f..9aeacdc 100644
--- a/src/long_mode/mod.rs
+++ b/src/long_mode/mod.rs
@@ -7,7 +7,7 @@ pub mod uarch;
pub use crate::MemoryAccessSize;
#[cfg(feature = "fmt")]
-pub use self::display::{DisplayStyle, InstructionDisplayer};
+pub use self::display::{DisplayStyle, InstructionDisplayer, InstructionTextBuffer};
use core::cmp::PartialEq;
use crate::safer_unchecked::unreachable_kinda_unchecked as unreachable_unchecked;
generated by cgit v1.1 at 2024-11-22 14:07:17 +0000