Merge pull request #1836 from carlokok/feature/object_file_section

Cranelift: Module data apis should allow specifying the object file section

cranelift/module/src/data_context.rs

@@ -3,7 +3,9 @@
 use cranelift_codegen::binemit::{Addend, CodeOffset};
 use cranelift_codegen::entity::PrimaryMap;
 use cranelift_codegen::ir;
+use std::borrow::ToOwned;
 use std::boxed::Box;
+use std::string::String;
 use std::vec::Vec;
 
 /// This specifies how data is to be initialized.
@@ -46,6 +48,8 @@ pub struct DataDescription {
     pub function_relocs: Vec<(CodeOffset, ir::FuncRef)>,
     /// Data addresses to write at specified offsets.
     pub data_relocs: Vec<(CodeOffset, ir::GlobalValue, Addend)>,
+    /// Object file section
+    pub custom_segment_section: Option<(String, String)>,
 }
 
 /// This is to data objects what cranelift_codegen::Context is to functions.
@@ -63,6 +67,7 @@ impl DataContext {
                 data_decls: PrimaryMap::new(),
                 function_relocs: vec![],
                 data_relocs: vec![],
+                custom_segment_section: None,
             },
         }
     }
@@ -90,6 +95,11 @@ impl DataContext {
         self.description.init = Init::Bytes { contents };
     }
 
+    /// Override the segment/section for data, only supported on Object backend
+    pub fn set_segment_section(&mut self, seg: &str, sec: &str) {
+        self.description.custom_segment_section = Some((seg.to_owned(), sec.to_owned()))
+    }
+
     /// Declare an external function import.
     ///
     /// Users of the `Module` API generally should call