moved crates in lib/ to src/, renamed crates, modified some files' text (#660)

moved crates in lib/ to src/, renamed crates, modified some files' text (#660)

cranelift/codegen/src/isa/call_conv.rs

@@ -0,0 +1,60 @@
+use core::fmt;
+use core::str;
+use target_lexicon::{CallingConvention, Triple};
+
+/// Calling convention identifiers.
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
+pub enum CallConv {
+    /// Best performance, not ABI-stable
+    Fast,
+    /// Smallest caller code size, not ABI-stable
+    Cold,
+    /// System V-style convention used on many platforms
+    SystemV,
+    /// Windows "fastcall" convention, also used for x64 and ARM
+    WindowsFastcall,
+    /// SpiderMonkey WebAssembly convention
+    Baldrdash,
+    /// Specialized convention for the probestack function
+    Probestack,
+}
+
+impl CallConv {
+    /// Return the default calling convention for the given target triple.
+    pub fn triple_default(triple: &Triple) -> Self {
+        match triple.default_calling_convention() {
+            // Default to System V for unknown targets because most everything
+            // uses System V.
+            Ok(CallingConvention::SystemV) | Err(()) => CallConv::SystemV,
+            Ok(CallingConvention::WindowsFastcall) => CallConv::WindowsFastcall,
+        }
+    }
+}
+
+impl fmt::Display for CallConv {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.write_str(match *self {
+            CallConv::Fast => "fast",
+            CallConv::Cold => "cold",
+            CallConv::SystemV => "system_v",
+            CallConv::WindowsFastcall => "windows_fastcall",
+            CallConv::Baldrdash => "baldrdash",
+            CallConv::Probestack => "probestack",
+        })
+    }
+}
+
+impl str::FromStr for CallConv {
+    type Err = ();
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "fast" => Ok(CallConv::Fast),
+            "cold" => Ok(CallConv::Cold),
+            "system_v" => Ok(CallConv::SystemV),
+            "windows_fastcall" => Ok(CallConv::WindowsFastcall),
+            "baldrdash" => Ok(CallConv::Baldrdash),
+            "probestack" => Ok(CallConv::Probestack),
+            _ => Err(()),
+        }
+    }
+}