split ffi crate to support distinct 16, 32, and 64-bit builds

initial work to optionally discard any instruction printing support

when using `-Z build-std` to fully remove .eh_frame, a stripped
long_mode_no_fmt .so is 61kb!

2 files changed, 17 insertions, 14 deletions

diff --git a/src/long_mode/display.rs b/src/long_mode/display.rs
index c3f4413..1be4a32 100644
--- a/src/long_mode/display.rs
+++ b/src/long_mode/display.rs
@@ -5,20 +5,7 @@ use core::fmt;
 use yaxpeax_arch::{Colorize, ShowContextual, NoColors, YaxColors};
 use yaxpeax_arch::display::*;
 
-use crate::long_mode::{RegSpec, Opcode, Operand, InstDecoder, Instruction, Segment, PrefixRex, OperandSpec, DecodeError};
-
-impl fmt::Display for DecodeError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        match self {
-            DecodeError::ExhaustedInput => { write!(f, "exhausted input") },
-            DecodeError::InvalidOpcode => { write!(f, "invalid opcode") },
-            DecodeError::InvalidOperand => { write!(f, "invalid operand") },
-            DecodeError::InvalidPrefixes => { write!(f, "invalid prefixes") },
-            DecodeError::TooLong => { write!(f, "too long") },
-            DecodeError::IncompleteDecoder => { write!(f, "the decoder is incomplete") },
-        }
-    }
-}
+use crate::long_mode::{RegSpec, Opcode, Operand, InstDecoder, Instruction, Segment, PrefixRex, OperandSpec};
 
 impl fmt::Display for InstDecoder {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
diff --git a/src/long_mode/mod.rs b/src/long_mode/mod.rs
index 909157b..ff5e43b 100644
--- a/src/long_mode/mod.rs
+++ b/src/long_mode/mod.rs
@@ -1,4 +1,5 @@
 mod vex;
+#[cfg(feature = "fmt")]
 mod display;
 pub mod uarch;
 
@@ -6,6 +7,20 @@ use core::hint::unreachable_unchecked;
 
 use yaxpeax_arch::{AddressDiff, Decoder, LengthedInstruction};
 
+use core::fmt;
+impl fmt::Display for DecodeError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            DecodeError::ExhaustedInput => { write!(f, "exhausted input") },
+            DecodeError::InvalidOpcode => { write!(f, "invalid opcode") },
+            DecodeError::InvalidOperand => { write!(f, "invalid operand") },
+            DecodeError::InvalidPrefixes => { write!(f, "invalid prefixes") },
+            DecodeError::TooLong => { write!(f, "too long") },
+            DecodeError::IncompleteDecoder => { write!(f, "the decoder is incomplete") },
+        }
+    }
+}
+
 #[cfg(feature="use-serde")]
 #[derive(Copy, Clone, Debug, PartialOrd, Ord, Eq, PartialEq, Serialize, Deserialize)]
 pub struct RegSpec {
@@ -71,6 +86,7 @@ impl RegSpec {
         RegisterClass { kind: self.bank }
     }
 
+    #[cfg(feature = "fmt")]
     /// return a human-friendly name for this register. the returned name is the same as would be
     /// used to render this register in an instruction.
     pub fn name(&self) -> &'static str {