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Fix DWARF generation for enums #54004

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Oct 31, 2018
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2 changes: 1 addition & 1 deletion src/ci/docker/x86_64-gnu/Dockerfile
Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
FROM ubuntu:16.04
FROM ubuntu:18.10

RUN apt-get update && apt-get install -y --no-install-recommends \
g++ \
Expand Down
526 changes: 382 additions & 144 deletions src/librustc_codegen_llvm/debuginfo/metadata.rs

Large diffs are not rendered by default.

29 changes: 28 additions & 1 deletion src/librustc_codegen_llvm/llvm/ffi.rs
Original file line number Diff line number Diff line change
Expand Up @@ -1307,6 +1307,19 @@ extern "C" {
Ty: &'a DIType)
-> &'a DIDerivedType;

pub fn LLVMRustDIBuilderCreateVariantMemberType(Builder: &DIBuilder<'a>,
Scope: &'a DIScope,
Name: *const c_char,
File: &'a DIFile,
LineNumber: c_uint,
SizeInBits: u64,
AlignInBits: u32,
OffsetInBits: u64,
Discriminant: Option<&'a Value>,
Flags: DIFlags,
Ty: &'a DIType)
-> &'a DIType;

pub fn LLVMRustDIBuilderCreateLexicalBlock(Builder: &DIBuilder<'a>,
Scope: &'a DIScope,
File: &'a DIFile,
Expand Down Expand Up @@ -1384,7 +1397,8 @@ extern "C" {
SizeInBits: u64,
AlignInBits: u32,
Elements: &'a DIArray,
ClassType: &'a DIType)
ClassType: &'a DIType,
IsFixed: bool)
-> &'a DIType;

pub fn LLVMRustDIBuilderCreateUnionType(Builder: &DIBuilder<'a>,
Expand All @@ -1400,6 +1414,19 @@ extern "C" {
UniqueId: *const c_char)
-> &'a DIType;

pub fn LLVMRustDIBuilderCreateVariantPart(Builder: &DIBuilder<'a>,
Scope: &'a DIScope,
Name: *const c_char,
File: &'a DIFile,
LineNo: c_uint,
SizeInBits: u64,
AlignInBits: u32,
Flags: DIFlags,
Discriminator: Option<&'a DIDerivedType>,
Elements: &'a DIArray,
UniqueId: *const c_char)
-> &'a DIDerivedType;

pub fn LLVMSetUnnamedAddr(GlobalVar: &Value, UnnamedAddr: Bool);

pub fn LLVMRustDIBuilderCreateTemplateTypeParameter(Builder: &DIBuilder<'a>,
Expand Down
2 changes: 1 addition & 1 deletion src/llvm
49 changes: 47 additions & 2 deletions src/rustllvm/RustWrapper.cpp
Original file line number Diff line number Diff line change
Expand Up @@ -713,6 +713,21 @@ extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateStructType(
unwrapDI<DIType>(VTableHolder), UniqueId));
}

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, 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)), UniqueId));
#else
abort();
#endif
}

extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateMemberType(
LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
LLVMMetadataRef File, unsigned LineNo, uint64_t SizeInBits,
Expand All @@ -724,6 +739,28 @@ extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateMemberType(
fromRust(Flags), unwrapDI<DIType>(Ty)));
}

extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateVariantMemberType(
LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope,
const char *Name, LLVMMetadataRef File, unsigned LineNo, uint64_t SizeInBits,
uint32_t AlignInBits, uint64_t OffsetInBits, LLVMValueRef Discriminant,
LLVMRustDIFlags Flags, LLVMMetadataRef Ty) {
#if LLVM_VERSION_GE(7, 0)
llvm::ConstantInt* D = nullptr;
if (Discriminant) {
D = unwrap<llvm::ConstantInt>(Discriminant);
}
return wrap(Builder->createVariantMemberType(unwrapDI<DIDescriptor>(Scope), Name,
unwrapDI<DIFile>(File), LineNo,
SizeInBits, AlignInBits, OffsetInBits, D,
fromRust(Flags), unwrapDI<DIType>(Ty)));
#else
return wrap(Builder->createMemberType(unwrapDI<DIDescriptor>(Scope), Name,
unwrapDI<DIFile>(File), LineNo,
SizeInBits, AlignInBits, OffsetInBits,
fromRust(Flags), unwrapDI<DIType>(Ty)));
#endif
}

extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateLexicalBlock(
LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope,
LLVMMetadataRef File, unsigned Line, unsigned Col) {
Expand Down Expand Up @@ -826,11 +863,19 @@ extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateEnumerationType(
LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
LLVMMetadataRef File, unsigned LineNumber, uint64_t SizeInBits,
uint32_t AlignInBits, LLVMMetadataRef Elements,
LLVMMetadataRef ClassTy) {
LLVMMetadataRef ClassTy, bool IsFixed) {
#if LLVM_VERSION_GE(7, 0)
return wrap(Builder->createEnumerationType(
unwrapDI<DIDescriptor>(Scope), Name, unwrapDI<DIFile>(File), LineNumber,
SizeInBits, AlignInBits, DINodeArray(unwrapDI<MDTuple>(Elements)),
unwrapDI<DIType>(ClassTy)));
unwrapDI<DIType>(ClassTy), "", IsFixed));
#else
// Ignore IsFixed on older LLVM.
return wrap(Builder->createEnumerationType(
unwrapDI<DIDescriptor>(Scope), Name, unwrapDI<DIFile>(File), LineNumber,
SizeInBits, AlignInBits, DINodeArray(unwrapDI<MDTuple>(Elements)),
unwrapDI<DIType>(ClassTy), ""));
#endif
}

extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateUnionType(
Expand Down
35 changes: 35 additions & 0 deletions src/test/codegen/enum-debug-clike.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,35 @@
// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// This test depends on a patch that was committed to upstream LLVM
// before 7.0, then backported to the Rust LLVM fork. It tests that
// debug info for "c-like" enums is properly emitted.

// ignore-tidy-linelength
// ignore-windows
// min-system-llvm-version 7.0

// compile-flags: -g -C no-prepopulate-passes

// CHECK-LABEL: @main
// CHECK: {{.*}}DICompositeType{{.*}}tag: DW_TAG_enumeration_type,{{.*}}name: "E",{{.*}}flags: DIFlagFixedEnum,{{.*}}
// CHECK: {{.*}}DIEnumerator{{.*}}name: "A",{{.*}}value: {{[0-9].*}}
// CHECK: {{.*}}DIEnumerator{{.*}}name: "B",{{.*}}value: {{[0-9].*}}
// CHECK: {{.*}}DIEnumerator{{.*}}name: "C",{{.*}}value: {{[0-9].*}}

#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(unused_assignments)]

enum E { A, B, C }

pub fn main() {
let e = E::C;
}
42 changes: 42 additions & 0 deletions src/test/codegen/enum-debug-niche.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,42 @@
// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// This test depends on a patch that was committed to upstream LLVM
// before 7.0, then backported to the Rust LLVM fork. It tests that
// optimized enum debug info accurately reflects the enum layout.

// ignore-tidy-linelength
// ignore-windows
// min-system-llvm-version 7.0

// compile-flags: -g -C no-prepopulate-passes

// CHECK-LABEL: @main
// CHECK: {{.*}}DICompositeType{{.*}}tag: DW_TAG_variant_part,{{.*}}discriminator:{{.*}}
// CHECK: {{.*}}DIDerivedType{{.*}}tag: DW_TAG_member,{{.*}}name: "A",{{.*}}extraData:{{.*}}
// CHECK: {{.*}}DICompositeType{{.*}}tag: DW_TAG_structure_type,{{.*}}name: "A",{{.*}}
// CHECK: {{.*}}DIDerivedType{{.*}}tag: DW_TAG_member,{{.*}}name: "B",{{.*}}extraData:{{.*}}
// CHECK: {{.*}}DICompositeType{{.*}}tag: DW_TAG_structure_type,{{.*}}name: "B",{{.*}}
// CHECK: {{.*}}DIDerivedType{{.*}}tag: DW_TAG_member,{{.*}}name: "C",{{.*}}extraData:{{.*}}
// CHECK: {{.*}}DICompositeType{{.*}}tag: DW_TAG_structure_type,{{.*}}name: "C",{{.*}}
// CHECK-NOT: {{.*}}DIDerivedType{{.*}}name: "D",{{.*}}extraData:{{.*}}
// CHECK: {{.*}}DIDerivedType{{.*}}tag: DW_TAG_member,{{.*}}name: "D",{{.*}}
// CHECK: {{.*}}DICompositeType{{.*}}tag: DW_TAG_structure_type,{{.*}}name: "D",{{.*}}
// CHECK: {{.*}}DIDerivedType{{.*}}tag: DW_TAG_member,{{.*}}flags: DIFlagArtificial{{.*}}

#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(unused_assignments)]

enum E { A, B, C, D(bool) }

pub fn main() {
let e = E::D(true);
}
40 changes: 40 additions & 0 deletions src/test/codegen/enum-debug-tagged.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,40 @@
// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// This test depends on a patch that was committed to upstream LLVM
// before 7.0, then backported to the Rust LLVM fork. It tests that
// debug info for tagged (ordinary) enums is properly emitted.

// ignore-tidy-linelength
// ignore-windows
// min-system-llvm-version 7.0

// compile-flags: -g -C no-prepopulate-passes

// CHECK-LABEL: @main
// CHECK: {{.*}}DICompositeType{{.*}}tag: DW_TAG_structure_type,{{.*}}name: "E",{{.*}}
// CHECK: {{.*}}DICompositeType{{.*}}tag: DW_TAG_variant_part,{{.*}}discriminator:{{.*}}
// CHECK: {{.*}}DIDerivedType{{.*}}tag: DW_TAG_member,{{.*}}name: "A",{{.*}}extraData:{{.*}}
// CHECK: {{.*}}DICompositeType{{.*}}tag: DW_TAG_structure_type,{{.*}}name: "A",{{.*}}
// CHECK: {{.*}}DIDerivedType{{.*}}tag: DW_TAG_member,{{.*}}name: "__0",{{.*}}
// CHECK: {{.*}}DIDerivedType{{.*}}tag: DW_TAG_member,{{.*}}name: "B",{{.*}}extraData:{{.*}}
// CHECK: {{.*}}DICompositeType{{.*}}tag: DW_TAG_structure_type,{{.*}}name: "B",{{.*}}
// CHECK: {{.*}}DIDerivedType{{.*}}tag: DW_TAG_member,{{.*}}name: "__0",{{.*}}
// CHECK: {{.*}}DIDerivedType{{.*}}tag: DW_TAG_member,{{.*}}flags: DIFlagArtificial{{.*}}

#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(unused_assignments)]

enum E { A(u32), B(u32) }

pub fn main() {
let e = E::A(23);
}
4 changes: 4 additions & 0 deletions src/test/debuginfo/basic-types.rs
Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,10 @@

// min-lldb-version: 310

// This fails on lldb 6.0.1 on x86-64 Fedora 28; so mark it macOS-only
// for now.
// only-macos

// compile-flags:-g

// === GDB TESTS ===================================================================================
Expand Down
94 changes: 94 additions & 0 deletions src/test/debuginfo/borrowed-enum-legacy.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,94 @@
// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// ignore-tidy-linelength
// min-lldb-version: 310

// As long as LLVM 5 and LLVM 6 are supported, we want to test the
// enum debuginfo fallback mode. Once those are desupported, this
// test can be removed, as there is another (non-"legacy") test that
// tests the new mode.
// ignore-llvm-version: 7.0 - 9.9.9
// ignore-gdb-version: 7.11.90 - 7.12.9
// ignore-gdb-version: 8.2 - 9.9

// compile-flags:-g

// === GDB TESTS ===================================================================================

// gdb-command:run

// gdb-command:print *the_a_ref
// gdbg-check:$1 = {{RUST$ENUM$DISR = TheA, x = 0, y = 8970181431921507452}, {RUST$ENUM$DISR = TheA, [...]}}
// gdbr-check:$1 = borrowed_enum_legacy::ABC::TheA{x: 0, y: 8970181431921507452}

// gdb-command:print *the_b_ref
// gdbg-check:$2 = {{RUST$ENUM$DISR = TheB, [...]}, {RUST$ENUM$DISR = TheB, __0 = 0, __1 = 286331153, __2 = 286331153}}
// gdbr-check:$2 = borrowed_enum_legacy::ABC::TheB(0, 286331153, 286331153)

// gdb-command:print *univariant_ref
// gdbg-check:$3 = {{__0 = 4820353753753434}}
// gdbr-check:$3 = borrowed_enum_legacy::Univariant::TheOnlyCase(4820353753753434)


// === LLDB TESTS ==================================================================================

// lldb-command:run

// lldb-command:print *the_a_ref
// lldbg-check:[...]$0 = TheA { x: 0, y: 8970181431921507452 }
// lldbr-check:(borrowed_enum_legacy::ABC::TheA) *the_a_ref = TheA { borrowed_enum_legacy::ABC::TheA: 0, borrowed_enum_legacy::ABC::TheB: 8970181431921507452 }
// lldb-command:print *the_b_ref
// lldbg-check:[...]$1 = TheB(0, 286331153, 286331153)
// lldbr-check:(borrowed_enum_legacy::ABC::TheB) *the_b_ref = { = 0 = 286331153 = 286331153 }
// lldb-command:print *univariant_ref
// lldbg-check:[...]$2 = TheOnlyCase(4820353753753434)
// lldbr-check:(borrowed_enum_legacy::Univariant) *univariant_ref = { borrowed_enum_legacy::TheOnlyCase = { = 4820353753753434 } }

#![allow(unused_variables)]
#![feature(omit_gdb_pretty_printer_section)]
#![omit_gdb_pretty_printer_section]

// The first element is to ensure proper alignment, irrespective of the machines word size. Since
// the size of the discriminant value is machine dependent, this has be taken into account when
// datatype layout should be predictable as in this case.
enum ABC {
TheA { x: i64, y: i64 },
TheB (i64, i32, i32),
}

// This is a special case since it does not have the implicit discriminant field.
enum Univariant {
TheOnlyCase(i64)
}

fn main() {

// 0b0111110001111100011111000111110001111100011111000111110001111100 = 8970181431921507452
// 0b01111100011111000111110001111100 = 2088533116
// 0b0111110001111100 = 31868
// 0b01111100 = 124
let the_a = ABC::TheA { x: 0, y: 8970181431921507452 };
let the_a_ref: &ABC = &the_a;

// 0b0001000100010001000100010001000100010001000100010001000100010001 = 1229782938247303441
// 0b00010001000100010001000100010001 = 286331153
// 0b0001000100010001 = 4369
// 0b00010001 = 17
let the_b = ABC::TheB (0, 286331153, 286331153);
let the_b_ref: &ABC = &the_b;

let univariant = Univariant::TheOnlyCase(4820353753753434);
let univariant_ref: &Univariant = &univariant;

zzz(); // #break
}

fn zzz() {()}
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