de-rust phase-0: archive Rust LLVM backend to archive/rust-llvm-backend (RESTORE documented); defaults unaffected

archive/rust-llvm-backend/llvm/compiler/codegen/utils.rs

@@ -0,0 +1,39 @@
+use crate::mir::instruction::{ConstValue, MirInstruction};
+use crate::mir::ValueId;
+use std::collections::HashMap;
+
+pub(super) fn sanitize_symbol(name: &str) -> String {
+    name.chars()
+        .map(|c| match c {
+            '.' | '/' | '-' => '_',
+            other => other,
+        })
+        .collect()
+}
+
+pub(super) fn build_const_str_map(
+    f: &crate::mir::function::MirFunction,
+) -> HashMap<ValueId, String> {
+    let mut m = HashMap::new();
+    for bid in f.block_ids() {
+        if let Some(b) = f.blocks.get(&bid) {
+            for inst in &b.instructions {
+                if let MirInstruction::Const {
+                    dst,
+                    value: ConstValue::String(s),
+                } = inst
+                {
+                    m.insert(*dst, s.clone());
+                }
+            }
+            if let Some(MirInstruction::Const {
+                dst,
+                value: ConstValue::String(s),
+            }) = &b.terminator
+            {
+                m.insert(*dst, s.clone());
+            }
+        }
+    }
+    m
+}