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Give variant parts their own unique id
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and bump llvm version in test
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@philipc
philipc committed Mar 27, 2019
1 parent e8de4c3 commit 3a5a8a5
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Showing 4 changed files with 28 additions and 17 deletions.
36 changes: 23 additions & 13 deletions src/librustc_codegen_llvm/debuginfo/metadata.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -188,6 +188,17 @@ impl TypeMap<'ll, 'tcx> {
let interner_key = self.unique_id_interner.intern(&enum_variant_type_id);
UniqueTypeId(interner_key)
}

// Get the unique type id string for an enum variant part.
// Variant parts are not types and shouldn't really have their own id,
// but it makes set_members_of_composite_type() simpler.
fn get_unique_type_id_str_of_enum_variant_part<'a>(&mut self,
enum_type_id: UniqueTypeId) -> &str {
let variant_part_type_id = format!("{}_variant_part",
self.get_unique_type_id_as_string(enum_type_id));
let interner_key = self.unique_id_interner.intern(&variant_part_type_id);
self.unique_id_interner.get(interner_key)
}
}

// A description of some recursive type. It can either be already finished (as
Expand Down Expand Up @@ -266,7 +277,6 @@ impl RecursiveTypeDescription<'ll, 'tcx> {
// ... and attach them to the stub to complete it.
set_members_of_composite_type(cx,
unfinished_type,
metadata_stub,
member_holding_stub,
member_descriptions);
return MetadataCreationResult::new(metadata_stub, true);
Expand Down Expand Up @@ -1216,7 +1226,6 @@ impl EnumMemberDescriptionFactory<'ll, 'tcx> {
set_members_of_composite_type(cx,
self.enum_type,
variant_type_metadata,
variant_type_metadata,
member_descriptions);
vec![
MemberDescription {
Expand Down Expand Up @@ -1258,7 +1267,6 @@ impl EnumMemberDescriptionFactory<'ll, 'tcx> {
set_members_of_composite_type(cx,
self.enum_type,
variant_type_metadata,
variant_type_metadata,
member_descriptions);
MemberDescription {
name: if fallback {
Expand Down Expand Up @@ -1301,7 +1309,6 @@ impl EnumMemberDescriptionFactory<'ll, 'tcx> {
set_members_of_composite_type(cx,
self.enum_type,
variant_type_metadata,
variant_type_metadata,
variant_member_descriptions);

// Encode the information about the null variant in the union
Expand Down Expand Up @@ -1362,7 +1369,6 @@ impl EnumMemberDescriptionFactory<'ll, 'tcx> {
set_members_of_composite_type(cx,
self.enum_type,
variant_type_metadata,
variant_type_metadata,
member_descriptions);

let niche_value = if i == dataful_variant {
Expand Down Expand Up @@ -1691,6 +1697,11 @@ fn prepare_enum_metadata(
},
};

let variant_part_unique_type_id_str = SmallCStr::new(
debug_context(cx).type_map
.borrow_mut()
.get_unique_type_id_str_of_enum_variant_part(unique_type_id)
);
let empty_array = create_DIArray(DIB(cx), &[]);
let variant_part = unsafe {
llvm::LLVMRustDIBuilderCreateVariantPart(
Expand All @@ -1703,7 +1714,8 @@ fn prepare_enum_metadata(
layout.align.abi.bits() as u32,
DIFlags::FlagZero,
discriminator_metadata,
empty_array)
empty_array,
variant_part_unique_type_id_str.as_ptr())
};

// The variant part must be wrapped in a struct according to DWARF.
Expand Down Expand Up @@ -1774,16 +1786,14 @@ fn composite_type_metadata(
set_members_of_composite_type(cx,
composite_type,
composite_type_metadata,
composite_type_metadata,
member_descriptions);

composite_type_metadata
}

fn set_members_of_composite_type(cx: &CodegenCx<'ll, 'tcx>,
composite_type: Ty<'tcx>,
metadata_stub: &'ll DICompositeType,
member_holding_stub: &'ll DICompositeType,
composite_type_metadata: &'ll DICompositeType,
member_descriptions: Vec<MemberDescription<'ll>>) {
// In some rare cases LLVM metadata uniquing would lead to an existing type
// description being used instead of a new one created in
Expand All @@ -1794,11 +1804,11 @@ fn set_members_of_composite_type(cx: &CodegenCx<'ll, 'tcx>,
{
let mut composite_types_completed =
debug_context(cx).composite_types_completed.borrow_mut();
if composite_types_completed.contains(&metadata_stub) {
if composite_types_completed.contains(&composite_type_metadata) {
bug!("debuginfo::set_members_of_composite_type() - \
Already completed forward declaration re-encountered.");
} else {
composite_types_completed.insert(metadata_stub);
composite_types_completed.insert(composite_type_metadata);
}
}

Expand All @@ -1809,7 +1819,7 @@ fn set_members_of_composite_type(cx: &CodegenCx<'ll, 'tcx>,
unsafe {
Some(llvm::LLVMRustDIBuilderCreateVariantMemberType(
DIB(cx),
member_holding_stub,
composite_type_metadata,
member_name.as_ptr(),
unknown_file_metadata(cx),
UNKNOWN_LINE_NUMBER,
Expand All @@ -1830,7 +1840,7 @@ fn set_members_of_composite_type(cx: &CodegenCx<'ll, 'tcx>,
unsafe {
let type_array = create_DIArray(DIB(cx), &member_metadata[..]);
llvm::LLVMRustDICompositeTypeReplaceArrays(
DIB(cx), member_holding_stub, Some(type_array), type_params);
DIB(cx), composite_type_metadata, Some(type_array), type_params);
}
}

Expand Down
3 changes: 2 additions & 1 deletion src/librustc_codegen_llvm/llvm/ffi.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1587,7 +1587,8 @@ extern "C" {
AlignInBits: u32,
Flags: DIFlags,
Discriminator: Option<&'a DIDerivedType>,
Elements: &'a DIArray)
Elements: &'a DIArray,
UniqueId: *const c_char)
-> &'a DIDerivedType;

pub fn LLVMSetUnnamedAddr(GlobalVar: &Value, UnnamedAddr: Bool);
Expand Down
4 changes: 2 additions & 2 deletions src/rustllvm/RustWrapper.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -723,12 +723,12 @@ extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateVariantPart(
LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
LLVMMetadataRef File, unsigned LineNumber, uint64_t SizeInBits,
uint32_t AlignInBits, LLVMRustDIFlags Flags, LLVMMetadataRef Discriminator,
LLVMMetadataRef Elements) {
LLVMMetadataRef Elements, const char *UniqueId) {
#if LLVM_VERSION_GE(7, 0)
return wrap(Builder->createVariantPart(
unwrapDI<DIDescriptor>(Scope), Name, unwrapDI<DIFile>(File), LineNumber,
SizeInBits, AlignInBits, fromRust(Flags), unwrapDI<DIDerivedType>(Discriminator),
DINodeArray(unwrapDI<MDTuple>(Elements))));
DINodeArray(unwrapDI<MDTuple>(Elements)), UniqueId));
#else
abort();
#endif
Expand Down
2 changes: 1 addition & 1 deletion src/test/debuginfo/enum-thinlto.rs
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
// ignore-tidy-linelength

// Require LLVM with DW_TAG_variant_part and a gdb that can read it.
// min-system-llvm-version: 7.0
// min-system-llvm-version: 8.0
// min-gdb-version: 8.2

// compile-flags:-g -Z thinlto
Expand Down

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