From 34d1bf415e9de5053f5f546c153438811e41fa2d Mon Sep 17 00:00:00 2001
From: Erin <erin@erindesu.cz>
Date: Wed, 14 Feb 2024 01:25:44 +0100
Subject: [PATCH] Don't fail to compile on unsupported architectures

---
 hbvm/src/float/mod.rs         | 26 ++++++++++++++++++++------
 hbvm/src/float/unsupported.rs | 16 ++++++++++++++++
 hbvm/src/lib.rs               |  2 ++
 hbxrt/src/main.rs             | 11 +++++++++++
 4 files changed, 49 insertions(+), 6 deletions(-)
 create mode 100644 hbvm/src/float/unsupported.rs

diff --git a/hbvm/src/float/mod.rs b/hbvm/src/float/mod.rs
index f8b3ea6..5206f70 100644
--- a/hbvm/src/float/mod.rs
+++ b/hbvm/src/float/mod.rs
@@ -1,13 +1,27 @@
 macro_rules! arch_specific {
     {
         $({$($cfg:tt)*} : $mod:ident;)*
-    } => {$(
-        #[cfg($($cfg)*)]
-        mod $mod;
+    } => {
+        $(
+            #[cfg($($cfg)*)]
+            mod $mod;
 
-        #[cfg($($cfg)*)]
-        pub use $mod::*;
-    )*};
+            #[cfg($($cfg)*)]
+            pub use $mod::*;
+
+            #[cfg($($cfg)*)]
+            pub const FL_ARCH_SPECIFIC_SUPPORTED: bool = true;
+        )*
+        
+        #[cfg(not(any($($($cfg)*),*)))]
+        mod unsupported;
+
+        #[cfg(not(any($($($cfg)*),*)))]
+        pub use unsupported::*;
+
+        #[cfg(not(any($($($cfg)*),*)))]
+        pub const FL_ARCH_SPECIFIC_SUPPORTED: bool = false;
+    };
 }
 
 arch_specific! {
diff --git a/hbvm/src/float/unsupported.rs b/hbvm/src/float/unsupported.rs
new file mode 100644
index 0000000..8befdd9
--- /dev/null
+++ b/hbvm/src/float/unsupported.rs
@@ -0,0 +1,16 @@
+use hbbytecode::RoundingMode;
+
+#[inline(always)]
+pub fn conv64to32(_: f64, _: RoundingMode) -> f32 {
+    f32::NAN
+}
+
+#[inline(always)]
+pub fn f32toint(_: f32, _: RoundingMode) -> i64 {
+    i64::MAX
+}
+
+#[inline(always)]
+pub fn f64toint(_: f64, _: RoundingMode) -> i64 {
+    i64::MAX
+}
diff --git a/hbvm/src/lib.rs b/hbvm/src/lib.rs
index e16c318..33a9fe2 100644
--- a/hbvm/src/lib.rs
+++ b/hbvm/src/lib.rs
@@ -25,6 +25,8 @@ mod float;
 mod utils;
 mod vmrun;
 
+pub use float::FL_ARCH_SPECIFIC_SUPPORTED;
+
 use {
     bmc::BlockCopier,
     mem::{Address, Memory},
diff --git a/hbxrt/src/main.rs b/hbxrt/src/main.rs
index 93a037f..156cb25 100644
--- a/hbxrt/src/main.rs
+++ b/hbxrt/src/main.rs
@@ -14,6 +14,17 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     eprintln!("== HB×RT (Holey Bytes Experimental Runtime) v0.1 ==");
     eprintln!("[W] Currently supporting only flat images");
 
+    if !hbvm::FL_ARCH_SPECIFIC_SUPPORTED {
+        eprintln!(
+            "\
+                [W] Architecture not fully supported!\n    \
+                    FTI32, FTI64 will yield {:#x}\n    \
+                    FC64T32 will yield NaN\
+            ",
+            i64::MAX,
+        )
+    }
+
     let mut args = args().skip(1);
     let Some(image_path) = args.next() else {
         eprintln!("[E] Missing image path");