vasilito
cb424d7448
verify-patch-sanity.py validates every active recipe .patch has internally- consistent hunk line counts — catching the 'malformed patch at line N' failure at commit/CI/preflight time instead of hours into a cook. This cycle hit that class three times (qtwaylandscanner, sddm, xwayland), each only discovered when cookbook tried to apply the patch. Running it across the repo found 29 latent malformed patches (validated against GNU patch: e.g. relibc/P3-sysv-ipc reproduces 'malformed patch at line 22'). They were harmless only because they sit in vendored recipes (baked, not re- applied) — but would fail on any version-bump re-derivation. --fix recounts the hunk headers (body untouched) and repaired all 29. Wired into build-preflight.sh (Phase 1.0D) and redbear-ci.yml, with a unit test (test-patch-sanity.sh). Skips archived/legacy trees and unvalidatable formats (empty placeholders, bare-@@ git hunks).
93 lines
3.3 KiB
C++
93 lines
3.3 KiB
C++
//===- Thunks.h --------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLD_ELF_THUNKS_H
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#define LLD_ELF_THUNKS_H
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#include "llvm/ADT/SmallVector.h"
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#include "Relocations.h"
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namespace lld::elf {
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struct Ctx;
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class Defined;
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class InputFile;
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class Symbol;
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class ThunkSection;
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// Class to describe an instance of a Thunk.
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// A Thunk is a code-sequence inserted by the linker in between a caller and
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// the callee. The relocation to the callee is redirected to the Thunk, which
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// after executing transfers control to the callee. Typical uses of Thunks
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// include transferring control from non-pi to pi and changing state on
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// targets like ARM.
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//
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// Thunks can be created for Defined, Shared and Undefined Symbols.
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// Thunks are assigned to synthetic ThunkSections
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class Thunk {
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public:
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Thunk(Ctx &, Symbol &destination, int64_t addend);
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virtual ~Thunk();
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virtual uint32_t size() = 0;
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virtual void writeTo(uint8_t *buf) = 0;
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// All Thunks must define at least one symbol, known as the thunk target
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// symbol, so that we can redirect relocations to it. The thunk may define
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// additional symbols, but these are never targets for relocations.
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virtual void addSymbols(ThunkSection &isec) = 0;
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void setOffset(uint64_t offset);
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Defined *addSymbol(StringRef name, uint8_t type, uint64_t value,
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InputSectionBase §ion);
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// Some Thunks must be placed immediately before their Target as they elide
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// a branch and fall through to the first Symbol in the Target.
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virtual InputSection *getTargetInputSection() const { return nullptr; }
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// To reuse a Thunk the InputSection and the relocation must be compatible
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// with it.
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virtual bool isCompatibleWith(const InputSection &,
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const Relocation &) const {
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return true;
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}
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// Thunks that indirectly branch to targets may need a synthetic landing
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// pad generated close to the target. For example AArch64 when BTI is
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// enabled.
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virtual bool needsSyntheticLandingPad() { return false; }
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Defined *getThunkTargetSym() const { return syms[0]; }
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Ctx &ctx;
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Symbol &destination;
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int64_t addend;
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// Alternative target when indirect branch to destination can't be used.
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Symbol *landingPad = nullptr;
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llvm::SmallVector<Defined *, 3> syms;
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uint64_t offset = 0;
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// The alignment requirement for this Thunk, defaults to the size of the
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// typical code section alignment.
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uint32_t alignment = 4;
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};
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// For a Relocation to symbol S create a Thunk to be added to a synthetic
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// ThunkSection.
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std::unique_ptr<Thunk> addThunk(Ctx &, const InputSection &isec,
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Relocation &rel);
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// Create a landing pad Thunk for use when indirect branches from Thunks
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// are restricted.
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std::unique_ptr<Thunk> addLandingPadThunk(Ctx &, Symbol &s, int64_t a);
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void writePPC32PltCallStub(Ctx &, uint8_t *buf, uint64_t gotPltVA,
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const InputFile *file, int64_t addend);
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void writePPC64LoadAndBranch(Ctx &, uint8_t *buf, int64_t offset);
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} // namespace lld::elf
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#endif
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