mv compiler to compiler/

compiler/rustc_codegen_llvm/src/debuginfo/source_loc.rs

@@ -0,0 +1,61 @@
+use super::metadata::{UNKNOWN_COLUMN_NUMBER, UNKNOWN_LINE_NUMBER};
+use super::utils::debug_context;
+
+use crate::common::CodegenCx;
+use crate::llvm::debuginfo::DIScope;
+use crate::llvm::{self, Value};
+use rustc_codegen_ssa::traits::*;
+
+use rustc_data_structures::sync::Lrc;
+use rustc_span::{BytePos, Pos, SourceFile, SourceFileAndLine, Span};
+
+/// A source code location used to generate debug information.
+pub struct DebugLoc {
+    /// Information about the original source file.
+    pub file: Lrc<SourceFile>,
+    /// The (1-based) line number.
+    pub line: Option<u32>,
+    /// The (1-based) column number.
+    pub col: Option<u32>,
+}
+
+impl CodegenCx<'ll, '_> {
+    /// Looks up debug source information about a `BytePos`.
+    pub fn lookup_debug_loc(&self, pos: BytePos) -> DebugLoc {
+        let (file, line, col) = match self.sess().source_map().lookup_line(pos) {
+            Ok(SourceFileAndLine { sf: file, line }) => {
+                let line_pos = file.line_begin_pos(pos);
+
+                // Use 1-based indexing.
+                let line = (line + 1) as u32;
+                let col = (pos - line_pos).to_u32() + 1;
+
+                (file, Some(line), Some(col))
+            }
+            Err(file) => (file, None, None),
+        };
+
+        // For MSVC, omit the column number.
+        // Otherwise, emit it. This mimics clang behaviour.
+        // See discussion in https://github.com/rust-lang/rust/issues/42921
+        if self.sess().target.target.options.is_like_msvc {
+            DebugLoc { file, line, col: None }
+        } else {
+            DebugLoc { file, line, col }
+        }
+    }
+
+    pub fn create_debug_loc(&self, scope: &'ll DIScope, span: Span) -> &'ll Value {
+        let DebugLoc { line, col, .. } = self.lookup_debug_loc(span.lo());
+
+        unsafe {
+            llvm::LLVMRustDIBuilderCreateDebugLocation(
+                debug_context(self).llcontext,
+                line.unwrap_or(UNKNOWN_LINE_NUMBER),
+                col.unwrap_or(UNKNOWN_COLUMN_NUMBER),
+                scope,
+                None,
+            )
+        }
+    }
+}