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use self::InternalDebugLocation::*;
use super::metadata::UNKNOWN_COLUMN_NUMBER;
use super::utils::{debug_context, span_start};
use rustc_codegen_ssa::mir::debuginfo::FunctionDebugContext;
use crate::builder::Builder;
use crate::llvm;
use crate::llvm::debuginfo::DIScope;
use log::debug;
use rustc_codegen_ssa::traits::*;
use libc::c_uint;
use rustc_span::{Pos, Span};
/// Sets the current debug location at the beginning of the span.
///
/// Maps to a call to llvm::LLVMSetCurrentDebugLocation(...).
pub fn set_source_location<D>(
debug_context: &FunctionDebugContext<D>,
bx: &Builder<'_, 'll, '_>,
scope: &'ll DIScope,
span: Span,
) {
let dbg_loc = if debug_context.source_locations_enabled {
debug!("set_source_location: {}", bx.sess().source_map().span_to_string(span));
let loc = span_start(bx.cx(), span);
InternalDebugLocation::new(scope, loc.line, loc.col.to_usize())
} else {
UnknownLocation
};
set_debug_location(bx, dbg_loc);
}
#[derive(Copy, Clone, PartialEq)]
pub enum InternalDebugLocation<'ll> {
KnownLocation { scope: &'ll DIScope, line: usize, col: usize },
UnknownLocation,
}
impl InternalDebugLocation<'ll> {
pub fn new(scope: &'ll DIScope, line: usize, col: usize) -> Self {
KnownLocation { scope, line, col }
}
}
pub fn set_debug_location(bx: &Builder<'_, 'll, '_>, debug_location: InternalDebugLocation<'ll>) {
let metadata_node = match debug_location {
KnownLocation { scope, line, col } => {
// For MSVC, set the column number to zero.
// Otherwise, emit it. This mimics clang behaviour.
// See discussion in https://github.com/rust-lang/rust/issues/42921
let col_used = if bx.sess().target.target.options.is_like_msvc {
UNKNOWN_COLUMN_NUMBER
} else {
col as c_uint
};
debug!("setting debug location to {} {}", line, col);
unsafe {
Some(llvm::LLVMRustDIBuilderCreateDebugLocation(
debug_context(bx.cx()).llcontext,
line as c_uint,
col_used,
scope,
None,
))
}
}
UnknownLocation => {
debug!("clearing debug location ");
None
}
};
unsafe {
llvm::LLVMSetCurrentDebugLocation(bx.llbuilder, metadata_node);
}
}
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