Added tests, some refactoring, fixed a parsing bug.

cranelift/filetests/parser/instruction_encoding.cton

@@ -0,0 +1,25 @@
+test cat
+
+isa riscv
+
+; regex: WS=[ \t]*
+
+function foo(i32, i32) {
+ebb1(v0: i32, v1: i32):
+    [-,-] v2 = iadd v0, v1
+    [-] trap
+    [R#1234, %x5, %x11] v6, v7 = iadd_cout v2, v0
+    [Rshamt#beef, %x25] v8 = ishl_imm v6, 2
+    v9 = iadd v8, v7
+    [Iret#5] return v0, v8
+}
+; sameln: function foo(i32, i32) {
+; nextln: $ebb1($v0: i32, $v1: i32):
+; nextln:     [-]$WS $v2 = iadd $v0, $v1
+; nextln:     [-]$WS trap
+; nextln:     [0#1234]$WS $v6, $v7 = iadd_cout $v2, $v0
+; TODO Add the full encoding information available: instruction recipe name and architectural registers if specified
+; nextln:     [2#beef]$WS $v8 = ishl_imm $v6, 2
+; nextln:     [-]$WS $v9 = iadd $v8, $v7
+; nextln:     [3#05]$WS return $v0, $v8
+; nextln: }

lib/reader/src/isaspec.rs

@@ -22,6 +22,18 @@ pub enum IsaSpec {
     Some(Vec<Box<TargetIsa>>),
 }
 
+impl IsaSpec {
+    /// If the `IsaSpec` contains exactly 1 `TargetIsa` we return a reference to it
+    pub fn unique_isa(&self) -> Option<&TargetIsa> {
+        if let &IsaSpec::Some(ref isa_vec) = self {
+            if isa_vec.len() == 1 {
+                return Some(&*isa_vec[0]);
+            }
+        }
+        None
+    }
+}
+
 /// Parse an iterator of command line options and apply them to `config`.
 pub fn parse_options<'a, I>(iter: I, config: &mut Configurable, loc: &Location) -> Result<()>
     where I: Iterator<Item = &'a str>

lib/reader/src/parser.rs

@@ -44,16 +44,7 @@ pub fn parse_test<'a>(text: &'a str) -> Result<TestFile<'a>> {
     let commands = parser.parse_test_commands();
     let isa_spec = parser.parse_isa_specs()?;
     let preamble_comments = parser.take_comments();
-
-    let functions = {
-        let mut unique_isa = None;
-        if let isaspec::IsaSpec::Some(ref isa_vec) = isa_spec {
-            if isa_vec.len() == 1 {
-                unique_isa = Some(&*isa_vec[0]);
-            }
-        }
-        parser.parse_function_list(unique_isa)?
-    };
+    let functions = parser.parse_function_list(isa_spec.unique_isa())?;
 
     Ok(TestFile {
         commands: commands,
@@ -102,7 +93,7 @@ impl<'a> Context<'a> {
         Context {
             function: f,
             map: SourceMap::new(),
-            unique_isa: unique_isa
+            unique_isa: unique_isa,
         }
     }
 
@@ -592,7 +583,8 @@ impl<'a> Parser<'a> {
     /// Parse a list of function definitions.
     ///
     /// This is the top-level parse function matching the whole contents of a file.
-    pub fn parse_function_list(&mut self, unique_isa: Option<&TargetIsa>)
+    pub fn parse_function_list(&mut self,
+                               unique_isa: Option<&TargetIsa>)
                                -> Result<Vec<(Function, Details<'a>)>> {
         let mut list = Vec::new();
         while self.token().is_some() {
@@ -605,7 +597,9 @@ impl<'a> Parser<'a> {
     //
     // function ::= * function-spec "{" preamble function-body "}"
     //
-    fn parse_function(&mut self, unique_isa: Option<&TargetIsa>) -> Result<(Function, Details<'a>)> {
+    fn parse_function(&mut self,
+                      unique_isa: Option<&TargetIsa>)
+                      -> Result<(Function, Details<'a>)> {
         // Begin gathering comments.
         // Make sure we don't include any comments before the `function` keyword.
         self.token();
@@ -916,6 +910,7 @@ impl<'a> Parser<'a> {
         while match self.token() {
             Some(Token::Value(_)) => true,
             Some(Token::Identifier(_)) => true,
+            Some(Token::LBracket) => true,
             _ => false,
         } {
             self.parse_instruction(ctx, ebb)?;
@@ -964,7 +959,8 @@ impl<'a> Parser<'a> {
         ctx.map.def_value(vx, value, &vx_location)
     }
 
-    fn parse_instruction_encoding(&mut self, ctx: &Context)
+    fn parse_instruction_encoding(&mut self,
+                                  ctx: &Context)
                                   -> Result<(Option<Encoding>, Option<Vec<&'a str>>)> {
         let (mut encoding, mut result_registers) = (None, None);
 
@@ -977,6 +973,11 @@ impl<'a> Parser<'a> {
 
                 if let Some(recipe_index) = ctx.find_recipe_index(recipe) {
                     encoding = Some(Encoding::new(recipe_index, bits));
+                } else if ctx.unique_isa.is_some() {
+                    return err!(self.loc, "invalid instruction recipe");
+                } else {
+                    return err!(self.loc,
+                                "provided instruction encoding for unspecified ISA");
                 }
             }
 
@@ -1525,7 +1526,7 @@ mod tests {
                                        ss3 = stack_slot 13
                                        ss1 = stack_slot 1
                                      }")
-            .parse_function()
+            .parse_function(None)
             .unwrap();
         assert_eq!(func.name.to_string(), "foo");
         let mut iter = func.stack_slots.keys();
@@ -1542,7 +1543,7 @@ mod tests {
                                     ss1  = stack_slot 13
                                     ss1  = stack_slot 1
                                 }")
-                       .parse_function()
+                       .parse_function(None)
                        .unwrap_err()
                        .to_string(),
                    "3: duplicate stack slot: ss1");
@@ -1554,7 +1555,7 @@ mod tests {
                                      ebb0:
                                      ebb4(vx3: i32):
                                      }")
-            .parse_function()
+            .parse_function(None)
             .unwrap();
         assert_eq!(func.name.to_string(), "ebbs");
 
@@ -1583,7 +1584,7 @@ mod tests {
                          trap ; Instruction
                          } ; Trailing.
                          ; More trailing.")
-                .parse_function()
+                .parse_function(None)
                 .unwrap();
         assert_eq!(func.name.to_string(), "comment");
         assert_eq!(comments.len(), 8); // no 'before' comment.