rust/tests/codegen/sroa-fragment-debuginfo.rs

// compile-flags: -g -Zmir-opt-level=0 -Zmir-enable-passes=+ScalarReplacementOfAggregates
// compile-flags: -Cno-prepopulate-passes
//
// Tested offsets are only correct for x86_64.
// only-x86_64

#![crate_type = "lib"]

pub struct ExtraSlice<'input> {
    slice: &'input [u8],
    extra: u32,
}

#[no_mangle]
pub fn extra(s: &[u8]) {
// CHECK: void @extra(
// CHECK: %slice.dbg.spill1 = alloca i32,
// CHECK: %slice.dbg.spill = alloca { ptr, i64 },
// CHECK: %s.dbg.spill = alloca { ptr, i64 },
// CHECK: call void @llvm.dbg.declare(metadata ptr %s.dbg.spill, metadata ![[S_EXTRA:.*]], metadata !DIExpression()),
// CHECK: call void @llvm.dbg.declare(metadata ptr %slice.dbg.spill, metadata ![[SLICE_EXTRA:.*]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 128)),
// CHECK: call void @llvm.dbg.declare(metadata ptr %slice.dbg.spill1, metadata ![[SLICE_EXTRA]], metadata !DIExpression(DW_OP_LLVM_fragment, 128, 32)),
    let slice = ExtraSlice { slice: s, extra: s.len() as u32 };
}

struct Zst;

pub struct ZstSlice<'input> {
    slice: &'input [u8],
    extra: Zst,
}

#[no_mangle]
pub fn zst(s: &[u8]) {
    // The field `extra` is a ZST. The fragment for the field `slice` encompasses the whole
    // variable, so is not a fragment. In that case, the variable must have no fragment.

// CHECK: void @zst(
// CHECK-NOT: call void @llvm.dbg.declare(metadata ptr %slice.dbg.spill, metadata !{}, metadata !DIExpression(DW_OP_LLVM_fragment,
// CHECK: call void @llvm.dbg.declare(metadata ptr %{{.*}}, metadata ![[SLICE_ZST:.*]], metadata !DIExpression()),
// CHECK-NOT: call void @llvm.dbg.declare(metadata ptr %{{.*}}, metadata ![[SLICE_ZST]],
    let slice = ZstSlice { slice: s, extra: Zst };
}

// CHECK: ![[S_EXTRA]] = !DILocalVariable(name: "s",
// CHECK: ![[SLICE_EXTRA]] = !DILocalVariable(name: "slice",