WIP: Add a test for -Zembed-source=yes (requires upstream gimli release)

Author: Mrmaxmeier

Cargo.lock

@@ -1612,6 +1612,16 @@ dependencies = [
  "rustc-std-workspace-core",
 ]
 
+[[package]]
+name = "gimli"
+version = "0.30.0"
+source = "git+https://github.com/gimli-rs/gimli.git?rev=aca0c4275e073da77a0c6e506ba9f4fb3c3aa6ca#aca0c4275e073da77a0c6e506ba9f4fb3c3aa6ca"
+dependencies = [
+ "fallible-iterator",
+ "indexmap",
+ "stable_deref_trait",
+]
+
 [[package]]
 name = "glob"
 version = "0.3.1"
@@ -3394,7 +3404,7 @@ dependencies = [
 name = "run_make_support"
 version = "0.2.0"
 dependencies = [
- "gimli 0.28.1",
+ "gimli 0.30.0",
  "object 0.34.0",
  "regex",
  "similar",

src/tools/run-make-support/Cargo.toml

@@ -8,4 +8,6 @@ object = "0.34.0"
 similar = "2.5.0"
 wasmparser = "0.118.2"
 regex = "1.8" # 1.8 to avoid memchr 2.6.0, as 2.5.0 is pinned in the workspace
-gimli = "0.28.1"
+# gimli = "0.28.1"
+# FIXME: replace with crates.io release once available
+gimli = { git = "https://github.com/gimli-rs/gimli.git", rev = "aca0c4275e073da77a0c6e506ba9f4fb3c3aa6ca" } # PR 728

tests/run-make/embed-source-dwarf/main.rs

@@ -0,0 +1,2 @@
+// hello
+fn main() {}

tests/run-make/embed-source-dwarf/rmake.rs

@@ -0,0 +1,64 @@
+//@ ignore-windows
+//@ ignore-apple
+
+// This test should be replaced with one in tests/debuginfo once we can easily
+// tell via GDB or LLDB if debuginfo contains source code. Cheap tricks in LLDB
+// like setting an invalid source map path don't appear to work, maybe this'll
+// become easier once GDB supports DWARFv6?
+
+use gimli::{AttributeValue, EndianRcSlice, Reader, RunTimeEndian};
+use object::{Object, ObjectSection};
+use run_make_support::{fs_wrapper, gimli, object, rustc};
+use std::collections::HashMap;
+use std::path::PathBuf;
+use std::rc::Rc;
+
+fn main() {
+    let output = PathBuf::from("embed-source-main");
+    rustc()
+        .input("main.rs")
+        .output(&output)
+        .arg("-g")
+        .arg("-Zembed-source=yes")
+        .arg("-Zdwarf-version=5")
+        .run();
+    let output = fs_wrapper::read(output);
+    let obj = object::File::parse(output.as_slice()).unwrap();
+    let endian = if obj.is_little_endian() { RunTimeEndian::Little } else { RunTimeEndian::Big };
+    let dwarf = gimli::Dwarf::load(|section| -> Result<_, ()> {
+        let data = obj.section_by_name(section.name()).map(|s| s.uncompressed_data().unwrap());
+        Ok(EndianRcSlice::new(Rc::from(data.unwrap_or_default().as_ref()), endian))
+    })
+    .unwrap();
+
+    let mut sources = HashMap::new();
+
+    let mut iter = dwarf.units();
+    while let Some(header) = iter.next().unwrap() {
+        let unit = dwarf.unit(header).unwrap();
+        let unit = unit.unit_ref(&dwarf);
+
+        if let Some(program) = &unit.line_program {
+            let header = program.header();
+            for file in header.file_names() {
+                if let Some(source) = file.source() {
+                    let path = unit
+                        .attr_string(file.path_name())
+                        .unwrap()
+                        .to_string_lossy()
+                        .unwrap()
+                        .to_string();
+                    let source =
+                        unit.attr_string(source).unwrap().to_string_lossy().unwrap().to_string();
+                    if !source.is_empty() {
+                        sources.insert(path, source);
+                    }
+                }
+            }
+        }
+    }
+
+    dbg!(&sources);
+    assert_eq!(sources.len(), 1);
+    assert_eq!(sources.get("main.rs").unwrap(), "// hello\nfn main() {}\n");
+}