Add reference types R32 and R64

-Add resumable_trap, safepoint, isnull, and null instructions
-Add Stackmap struct and StackmapSink trait

Co-authored-by: Mir Ahmed <mirahmed753@gmail.com>
Co-authored-by: Dan Gohman <sunfish@mozilla.com>

cranelift/filetests/src/lib.rs

@@ -46,6 +46,7 @@ mod test_postopt;
 mod test_preopt;
 mod test_print_cfg;
 mod test_regalloc;
+mod test_safepoint;
 mod test_shrink;
 mod test_simple_gvn;
 mod test_simple_preopt;
@@ -127,6 +128,7 @@ fn new_subtest(parsed: &TestCommand) -> subtest::SubtestResult<Box<dyn subtest::
         "simple-gvn" => test_simple_gvn::subtest(parsed),
         "verifier" => test_verifier::subtest(parsed),
         "preopt" => test_preopt::subtest(parsed),
+        "safepoint" => test_safepoint::subtest(parsed),
         _ => Err(format!("unknown test command '{}'", parsed.command)),
     }
 }

cranelift/filetests/src/test_binemit.rs

@@ -11,6 +11,7 @@ use cranelift_codegen::dominator_tree::DominatorTree;
 use cranelift_codegen::flowgraph::ControlFlowGraph;
 use cranelift_codegen::ir;
 use cranelift_codegen::ir::entities::AnyEntity;
+use cranelift_codegen::isa;
 use cranelift_codegen::print_errors::pretty_error;
 use cranelift_codegen::settings::OptLevel;
 use cranelift_reader::TestCommand;
@@ -100,9 +101,15 @@ impl binemit::CodeSink for TextSink {
     fn begin_jumptables(&mut self) {
         self.code_size = self.offset
     }
-
     fn begin_rodata(&mut self) {}
     fn end_codegen(&mut self) {}
+    fn add_stackmap(
+        &mut self,
+        _: &[ir::entities::Value],
+        _: &ir::Function,
+        _: &dyn isa::TargetIsa,
+    ) {
+    }
 }
 
 impl SubTest for TestBinEmit {

cranelift/filetests/src/test_compile.rs

@@ -6,6 +6,7 @@ use crate::subtest::{run_filecheck, Context, SubTest, SubtestResult};
 use cranelift_codegen;
 use cranelift_codegen::binemit::{self, CodeInfo};
 use cranelift_codegen::ir;
+use cranelift_codegen::isa;
 use cranelift_codegen::print_errors::pretty_error;
 use cranelift_reader::TestCommand;
 use log::info;
@@ -53,8 +54,9 @@ impl SubTest for TestCompile {
         let mut sink = SizeSink { offset: 0 };
         binemit::emit_function(
             &comp_ctx.func,
-            |func, inst, div, sink| isa.emit_inst(func, inst, div, sink),
+            |func, inst, div, sink, isa| isa.emit_inst(func, inst, div, sink),
             &mut sink,
+            isa,
         );
 
         if sink.offset != total_size {
@@ -109,4 +111,11 @@ impl binemit::CodeSink for SizeSink {
     fn begin_jumptables(&mut self) {}
     fn begin_rodata(&mut self) {}
     fn end_codegen(&mut self) {}
+    fn add_stackmap(
+        &mut self,
+        _: &[ir::entities::Value],
+        _: &ir::Function,
+        _: &dyn isa::TargetIsa,
+    ) {
+    }
 }

cranelift/filetests/src/test_safepoint.rs

@@ -0,0 +1,39 @@
+use crate::subtest::{run_filecheck, Context, SubTest, SubtestResult};
+use cranelift_codegen::ir::Function;
+use cranelift_codegen::print_errors::pretty_error;
+use cranelift_reader::TestCommand;
+use std::borrow::Cow;
+
+struct TestSafepoint;
+
+pub fn subtest(parsed: &TestCommand) -> SubtestResult<Box<SubTest>> {
+    assert_eq!(parsed.command, "safepoint");
+    if !parsed.options.is_empty() {
+        Err(format!("No options allowed on {}", parsed))
+    } else {
+        Ok(Box::new(TestSafepoint))
+    }
+}
+
+impl SubTest for TestSafepoint {
+    fn name(&self) -> &'static str {
+        "safepoint"
+    }
+
+    fn run(&self, func: Cow<Function>, context: &Context) -> SubtestResult<()> {
+        let mut comp_ctx = cranelift_codegen::Context::for_function(func.into_owned());
+
+        let isa = context.isa.expect("register allocator needs an ISA");
+        comp_ctx.compute_cfg();
+        comp_ctx
+            .legalize(isa)
+            .map_err(|e| pretty_error(&comp_ctx.func, context.isa, e))?;
+        comp_ctx.compute_domtree();
+        comp_ctx
+            .regalloc(isa)
+            .map_err(|e| pretty_error(&comp_ctx.func, context.isa, e))?;
+
+        let text = comp_ctx.func.display(context.isa).to_string();
+        run_filecheck(&text, context)
+    }
+}