Cranelift: refactoring of unwind info (#2289)

* factor common code * move fde/unwind emit to more abstract level * code_len -> function_size * speedup block scanning * better function_size calciulation * Rename UnwindCode enums
2020-10-15 08:34:50 -05:00
parent e659d5cecd
commit 3c68845813
8 changed files with 813 additions and 391 deletions
--- a/cranelift/codegen/src/ir/function.rs
+++ b/cranelift/codegen/src/ir/function.rs
@@ -94,7 +94,7 @@ pub struct Function {
    /// The instructions that mark the start (inclusive) of an epilogue in the function.
    ///
    /// This is used for some ABIs to generate unwind information.
-    pub epilogues_start: Vec<Inst>,
+    pub epilogues_start: Vec<(Inst, Block)>,

    /// An optional global value which represents an expression evaluating to
    /// the stack limit for this function. This `GlobalValue` will be