Promote the src/tools crate to the top-level workspace.

The 'src' and 'tests' top-level directories now contain tools sources
and integration tests for any of the library crates.

cranelift/src/filetest/runone.rs

@@ -0,0 +1,115 @@
+//! Run the tests in a single test file.
+
+use std::borrow::Cow;
+use std::path::Path;
+use std::time;
+use cretonne::ir::Function;
+use cretonne::isa::TargetIsa;
+use cretonne::settings::Flags;
+use cretonne::verify_function;
+use cton_reader::parse_test;
+use cton_reader::IsaSpec;
+use utils::read_to_string;
+use filetest::{TestResult, new_subtest};
+use filetest::subtest::{SubTest, Context, Result};
+
+/// Load `path` and run the test in it.
+///
+/// If running this test causes a panic, it will propagate as normal.
+pub fn run(path: &Path) -> TestResult {
+    let started = time::Instant::now();
+    let buffer = try!(read_to_string(path).map_err(|e| e.to_string()));
+    let testfile = try!(parse_test(&buffer).map_err(|e| e.to_string()));
+    if testfile.functions.is_empty() {
+        return Err("no functions found".to_string());
+    }
+
+    // Parse the test commands.
+    let mut tests = try!(testfile.commands.iter().map(new_subtest).collect::<Result<Vec<_>>>());
+
+    // Flags to use for those tests that don't need an ISA.
+    // This is the cumulative effect of all the `set` commands in the file.
+    let flags = match testfile.isa_spec {
+        IsaSpec::None(ref f) => f,
+        IsaSpec::Some(ref v) => v.last().expect("Empty ISA list").flags(),
+    };
+
+    // Sort the tests so the mutators are at the end, and those that don't need the verifier are at
+    // the front.
+    tests.sort_by_key(|st| (st.is_mutating(), st.needs_verifier()));
+
+    // Expand the tests into (test, flags, isa) tuples.
+    let mut tuples = try!(test_tuples(&tests, &testfile.isa_spec, flags));
+
+    // Isolate the last test in the hope that this is the only mutating test.
+    // If so, we can completely avoid cloning functions.
+    let last_tuple = match tuples.pop() {
+        None => return Err("no test commands found".to_string()),
+        Some(t) => t,
+    };
+
+    for (func, details) in testfile.functions {
+        let mut context = Context {
+            details: details,
+            verified: false,
+            flags: flags,
+            isa: None,
+        };
+
+        for tuple in &tuples {
+            try!(run_one_test(*tuple, Cow::Borrowed(&func), &mut context));
+        }
+        // Run the last test with an owned function which means it won't need to clone it before
+        // mutating.
+        try!(run_one_test(last_tuple, Cow::Owned(func), &mut context));
+    }
+
+
+    // TODO: Actually run the tests.
+    Ok(started.elapsed())
+}
+
+// Given a slice of tests, generate a vector of (test, flags, isa) tuples.
+fn test_tuples<'a>(tests: &'a [Box<SubTest>],
+                   isa_spec: &'a IsaSpec,
+                   no_isa_flags: &'a Flags)
+                   -> Result<Vec<(&'a SubTest, &'a Flags, Option<&'a TargetIsa>)>> {
+    let mut out = Vec::new();
+    for test in tests {
+        if test.needs_isa() {
+            match *isa_spec {
+                IsaSpec::None(_) => {
+                    // TODO: Generate a list of default ISAs.
+                    return Err(format!("test {} requires an ISA", test.name()));
+                }
+                IsaSpec::Some(ref isas) => {
+                    for isa in isas {
+                        out.push((&**test, isa.flags(), Some(&**isa)));
+                    }
+                }
+            }
+        } else {
+            out.push((&**test, no_isa_flags, None));
+        }
+    }
+    Ok(out)
+}
+
+fn run_one_test<'a>(tuple: (&'a SubTest, &'a Flags, Option<&'a TargetIsa>),
+                    func: Cow<Function>,
+                    context: &mut Context<'a>)
+                    -> Result<()> {
+    let (test, flags, isa) = tuple;
+    let name = format!("{}({})", test.name(), func.name);
+
+    context.flags = flags;
+    context.isa = isa;
+
+    // Should we run the verifier before this test?
+    if !context.verified && test.needs_verifier() {
+        try!(verify_function(&func).map_err(|e| e.to_string()));
+        context.verified = true;
+    }
+
+    test.run(func, context).map_err(|e| format!("{}: {}", name, e))
+}