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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,
)
}
}
}
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