Use relative positions inside a SourceFile.

Author: cjgillot

clippy_lints/src/undocumented_unsafe_blocks.rs

@@ -12,7 +12,7 @@ use rustc_lexer::{tokenize, TokenKind};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_tool_lint, impl_lint_pass};
-use rustc_span::{BytePos, Pos, Span, SyntaxContext};
+use rustc_span::{BytePos, RelativeBytePos,Pos, Span, SyntaxContext};
 
 declare_clippy_lint! {
     /// ### What it does
@@ -688,7 +688,7 @@ fn span_in_body_has_safety_comment(cx: &LateContext<'_>, span: Span) -> bool {
 }
 
 /// Checks if the given text has a safety comment for the immediately proceeding line.
-fn text_has_safety_comment(src: &str, line_starts: &[BytePos], offset: usize) -> Option<BytePos> {
+fn text_has_safety_comment(src: &str, line_starts: &[RelativeBytePos], offset: usize) -> Option<BytePos> {
     let mut lines = line_starts
         .array_windows::<2>()
         .rev()

clippy_utils/src/source.rs

@@ -8,7 +8,7 @@ use rustc_hir::{BlockCheckMode, Expr, ExprKind, UnsafeSource};
 use rustc_lint::{LateContext, LintContext};
 use rustc_session::Session;
 use rustc_span::source_map::{original_sp, SourceMap};
-use rustc_span::{hygiene, BytePos, Pos, SourceFile, Span, SpanData, SyntaxContext, DUMMY_SP};
+use rustc_span::{hygiene, BytePos, SourceFileAndLine, Pos, SourceFile, Span, SpanData, SyntaxContext, DUMMY_SP};
 use std::borrow::Cow;
 use std::ops::Range;
 
@@ -117,9 +117,9 @@ fn first_char_in_first_line<T: LintContext>(cx: &T, span: Span) -> Option<BytePo
 /// ```
 fn line_span<T: LintContext>(cx: &T, span: Span) -> Span {
     let span = original_sp(span, DUMMY_SP);
-    let source_map_and_line = cx.sess().source_map().lookup_line(span.lo()).unwrap();
-    let line_no = source_map_and_line.line;
-    let line_start = source_map_and_line.sf.lines(|lines| lines[line_no]);
+    let SourceFileAndLine { sf, line } = cx.sess().source_map().lookup_line(span.lo()).unwrap();
+    let line_start = sf.lines(|lines| lines[line]);
+    let line_start = sf.absolute_position(line_start);
     span.with_lo(line_start)
 }