Backport --package-metadata flag
For https://bugzilla.redhat.com/show_bug.cgi?id=2051597.
This commit is contained in:
Nikita Popov
parent
379a6fefd7
commit
d2d0adf744
170
0001-ELF-Support-package-metadata.patch
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170
0001-ELF-Support-package-metadata.patch
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From 2a5f3345e72b2c1a66d3714eaae37e7b05ef5c65 Mon Sep 17 00:00:00 2001
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From: Alex Brachet <abrachet@google.com>
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Date: Mon, 8 Aug 2022 21:31:58 +0000
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Subject: [PATCH] [ELF] Support --package-metadata
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This was recently introduced in GNU linkers and it makes sense for
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ld.lld to have the same support. This implementation omits checking if
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the input string is valid json to reduce size bloat.
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Differential Revision: https://reviews.llvm.org/D131439
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---
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lld/ELF/Config.h | 1 +
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lld/ELF/Driver.cpp | 1 +
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lld/ELF/Options.td | 2 ++
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lld/ELF/SyntheticSections.cpp | 14 ++++++++++++++
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lld/ELF/SyntheticSections.h | 11 +++++++++++
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lld/ELF/Writer.cpp | 5 +++++
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lld/docs/ReleaseNotes.rst | 2 ++
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lld/test/ELF/package-metadata.s | 19 +++++++++++++++++++
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8 files changed, 55 insertions(+)
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create mode 100644 lld/test/ELF/package-metadata.s
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diff --git a/lld/ELF/Config.h b/lld/ELF/Config.h
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index 72b7be8165e0..38545d257a2b 100644
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--- a/lld/ELF/Config.h
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+++ b/lld/ELF/Config.h
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@@ -281,6 +281,7 @@ struct Configuration {
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StringRef thinLTOJobs;
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unsigned timeTraceGranularity;
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int32_t splitStackAdjustSize;
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+ StringRef packageMetadata;
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// The following config options do not directly correspond to any
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// particular command line options.
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diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp
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index 54b487bdc243..39adc5d707d7 100644
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--- a/lld/ELF/Driver.cpp
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+++ b/lld/ELF/Driver.cpp
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@@ -1092,6 +1092,7 @@ static void readConfigs(opt::InputArgList &args) {
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config->optimize = args::getInteger(args, OPT_O, 1);
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config->orphanHandling = getOrphanHandling(args);
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config->outputFile = args.getLastArgValue(OPT_o);
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+ config->packageMetadata = args.getLastArgValue(OPT_package_metadata);
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config->pie = args.hasFlag(OPT_pie, OPT_no_pie, false);
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config->printIcfSections =
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args.hasFlag(OPT_print_icf_sections, OPT_no_print_icf_sections, false);
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diff --git a/lld/ELF/Options.td b/lld/ELF/Options.td
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index cf2013a5f820..52f5485af1f4 100644
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--- a/lld/ELF/Options.td
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+++ b/lld/ELF/Options.td
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@@ -505,6 +505,8 @@ def z: JoinedOrSeparate<["-"], "z">, MetaVarName<"<option>">,
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def visual_studio_diagnostics_format : FF<"vs-diagnostics">,
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HelpText<"Format diagnostics for Visual Studio compatibility">;
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+def package_metadata: JJ<"package-metadata=">, HelpText<"Emit package metadata note">;
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+
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// Aliases
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def: Separate<["-"], "f">, Alias<auxiliary>, HelpText<"Alias for --auxiliary">;
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def: F<"call_shared">, Alias<Bdynamic>, HelpText<"Alias for --Bdynamic">;
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diff --git a/lld/ELF/SyntheticSections.cpp b/lld/ELF/SyntheticSections.cpp
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index 7778ae5f78e6..5e5495540215 100644
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--- a/lld/ELF/SyntheticSections.cpp
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+++ b/lld/ELF/SyntheticSections.cpp
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@@ -3844,6 +3844,20 @@ void InStruct::reset() {
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symTabShndx.reset();
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}
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+void PackageMetadataNote::writeTo(uint8_t *buf) {
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+ write32(buf, 4);
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+ write32(buf + 4, config->packageMetadata.size() + 1);
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+ write32(buf + 8, 0xcafe1a7e);
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+ memcpy(buf + 12, "FDO", 4);
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+ memcpy(buf + 16, config->packageMetadata.data(),
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+ config->packageMetadata.size());
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+}
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+
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+size_t PackageMetadataNote::getSize() const {
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+ return sizeof(llvm::ELF::Elf64_Nhdr) + 4 +
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+ alignTo(config->packageMetadata.size() + 1, 4);
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+}
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+
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InStruct elf::in;
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std::vector<Partition> elf::partitions;
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diff --git a/lld/ELF/SyntheticSections.h b/lld/ELF/SyntheticSections.h
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index 3161785988f6..7b31b5e97731 100644
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--- a/lld/ELF/SyntheticSections.h
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+++ b/lld/ELF/SyntheticSections.h
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@@ -1185,6 +1185,16 @@ public:
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void writeTo(uint8_t *buf) override;
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};
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+
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+class PackageMetadataNote : public SyntheticSection {
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+public:
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+ PackageMetadataNote()
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+ : SyntheticSection(llvm::ELF::SHF_ALLOC, llvm::ELF::SHT_NOTE,
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+ /*alignment=*/4, ".note.package") {}
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+ void writeTo(uint8_t *buf) override;
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+ size_t getSize() const override;
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+};
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+
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InputSection *createInterpSection();
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MergeInputSection *createCommentSection();
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template <class ELFT> void splitSections();
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@@ -1215,6 +1225,7 @@ struct Partition {
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std::unique_ptr<EhFrameSection> ehFrame;
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std::unique_ptr<GnuHashTableSection> gnuHashTab;
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std::unique_ptr<HashTableSection> hashTab;
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+ std::unique_ptr<PackageMetadataNote> packageMetadataNote;
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std::unique_ptr<RelocationBaseSection> relaDyn;
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std::unique_ptr<RelrBaseSection> relrDyn;
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std::unique_ptr<VersionDefinitionSection> verDef;
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diff --git a/lld/ELF/Writer.cpp b/lld/ELF/Writer.cpp
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index 5794f048c990..fa6353db8c6d 100644
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--- a/lld/ELF/Writer.cpp
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+++ b/lld/ELF/Writer.cpp
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@@ -417,6 +417,11 @@ template <class ELFT> void elf::createSyntheticSections() {
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part.armExidx = std::make_unique<ARMExidxSyntheticSection>();
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add(*part.armExidx);
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}
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+
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+ if (!config->packageMetadata.empty()) {
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+ part.packageMetadataNote = std::make_unique<PackageMetadataNote>();
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+ add(*part.packageMetadataNote);
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+ }
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}
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if (partitions.size() != 1) {
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diff --git a/lld/docs/ReleaseNotes.rst b/lld/docs/ReleaseNotes.rst
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index 672759fdf6b3..b94b73c4aea7 100644
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--- a/lld/docs/ReleaseNotes.rst
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+++ b/lld/docs/ReleaseNotes.rst
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@@ -25,6 +25,8 @@ Non-comprehensive list of changes in this release
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ELF Improvements
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----------------
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+* ``--package-metadata=`` has been added to create package metadata notes
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+ (`D131439 <https://reviews.llvm.org/D131439>`_)
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* ``--export-dynamic-symbol-list`` has been added.
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(`D107317 <https://reviews.llvm.org/D107317>`_)
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diff --git a/lld/test/ELF/package-metadata.s b/lld/test/ELF/package-metadata.s
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new file mode 100644
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index 000000000000..29df499d7e98
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--- /dev/null
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+++ b/lld/test/ELF/package-metadata.s
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@@ -0,0 +1,19 @@
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+# REQUIRES: x86
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+
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+# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o
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+
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+# RUN: ld.lld %t.o -o %t --package-metadata='{}'
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+# RUN: llvm-readelf -n %t | FileCheck %s --check-prefixes=NOTE,FIRST
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+
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+# RUN: ld.lld %t.o -o %t --package-metadata='{"abc":123}'
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+# RUN: llvm-readelf -n %t | FileCheck %s --check-prefixes=NOTE,SECOND
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+
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+# NOTE: .note.package
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+# NOTE-NEXT: Owner
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+# NOTE-NEXT: FDO 0x{{.*}} Unknown note type: (0xcafe1a7e)
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+# FIRST-NEXT: description data: 7b 7d 00
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+# SECOND-NEXT: description data: 7b 22 61 62 63 22 3a 31 32 33 7d 00
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+
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+.globl _start
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+_start:
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+ ret
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--
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2.37.1
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8
lld.spec
8
lld.spec
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Name: lld
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Version: %{maj_ver}.%{min_ver}.%{patch_ver}%{?rc_ver:~rc%{rc_ver}}
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Release: 3%{?dist}
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Release: 4%{?dist}
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Summary: The LLVM Linker
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License: NCSA
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@ -30,6 +30,9 @@ Patch0: 0001-PATCH-lld-CMake-Check-for-gtest-headers-even-if-lit..patch
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# Bundle libunwind header need during build for MachO support
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Patch1: 0002-PATCH-lld-Import-compact_unwind_encoding.h-from-libu.patch
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# Backport --package-metadata flag
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Patch2: 0001-ELF-Support-package-metadata.patch
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BuildRequires: gcc
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BuildRequires: gcc-c++
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BuildRequires: cmake
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@ -206,6 +209,9 @@ fi
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%{_datadir}/lld/lit.lld-test.cfg.py
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%changelog
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* Tue Aug 09 2022 Nikita Popov <npopov@redhat.com> - 14.0.5-4
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- Backport --package-metadata flag
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* Thu Jul 21 2022 Fedora Release Engineering <releng@fedoraproject.org> - 14.0.5-3
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- Rebuilt for https://fedoraproject.org/wiki/Fedora_37_Mass_Rebuild
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