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Auto merge of #116096 - cjgillot:debuginfo-fndef-size, r=nikic

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Make FnDef 1-ZST in LLVM debuginfo.

Discussed in https://rust-lang.zulipchat.com/#narrow/stream/187780-t-compiler.2Fwg-llvm/topic/LLVM.20HEAD.20llvm.2Edbg.2Edeclare.2Falloca.20size.20mismatch

r? `@nikic`
This commit is contained in:
bors 2023-10-09 02:08:13 +00:00
commit 1f48cbc3f8
2 changed files with 28 additions and 2 deletions
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12
compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs
View File

@ -335,12 +335,20 @@ fn build_subroutine_type_di_node<'ll, 'tcx>(
// This is actually a function pointer, so wrap it in pointer DI.
let name = compute_debuginfo_type_name(cx.tcx, fn_ty, false);
let (size, align) = match fn_ty.kind() {
ty::FnDef(..) => (0, 1),
ty::FnPtr(..) => (
cx.tcx.data_layout.pointer_size.bits(),
cx.tcx.data_layout.pointer_align.abi.bits() as u32,
),
_ => unreachable!(),
};
let di_node = unsafe {
llvm::LLVMRustDIBuilderCreatePointerType(
DIB(cx),
fn_di_node,
cx.tcx.data_layout.pointer_size.bits(),
cx.tcx.data_layout.pointer_align.abi.bits() as u32,
size,
align,
0, // Ignore DWARF address space.
name.as_ptr().cast(),
name.len(),

18
tests/codegen/debug-fndef-size.rs Normal file
View File

@ -0,0 +1,18 @@
// Verify that `i32::cmp` FnDef type is declared with size 0 and align 1 in LLVM debuginfo.
// compile-flags: -O -g -Cno-prepopulate-passes
// ignore-msvc the types are mangled differently
use std::cmp::Ordering;
fn foo<F: FnOnce(&i32, &i32) -> Ordering>(v1: i32, v2: i32, compare: F) -> Ordering {
compare(&v1, &v2)
}
pub fn main() {
foo(0, 1, i32::cmp);
}
// CHECK: %compare.dbg.spill = alloca {}, align 1
// CHECK: call void @llvm.dbg.declare(metadata ptr %compare.dbg.spill, metadata ![[VAR:.*]], metadata !DIExpression()), !dbg !{{.*}}
// CHECK: ![[TYPE:.*]] = !DIDerivedType(tag: DW_TAG_pointer_type, name: "fn(&i32, &i32) -> core::cmp::Ordering", baseType: !{{.*}}, align: 1, dwarfAddressSpace: {{.*}})
// CHECK: ![[VAR]] = !DILocalVariable(name: "compare", scope: !{{.*}}, file: !{{.*}}, line: {{.*}}, type: ![[TYPE]], align: 1)