mirror of
https://github.com/revng/revng
synced 2026-06-21 14:07:57 +00:00
Alessandro Di Federico
3e31edf817
This commit introduces `FixPointerSize`, a pipe changing the `DataLayout` of module in order to have a pointer size identical to the one of `targetABI()`. The pipe also performs safety checks to ensure this does not corrupt semantics.
52 lines
2.0 KiB
C++
52 lines
2.0 KiB
C++
#pragma once
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//
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// This file is distributed under the MIT License. See LICENSE.md for details.
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//
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#include "revng/PipeboxCommon/Common.h"
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#include "revng/PipeboxCommon/LLVMContainer.h"
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#include "revng/PipeboxCommon/Model.h"
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namespace revng::pypeline::pipes {
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// For target binaries with 32-bit pointers, rewrite the LLVM module's
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// DataLayout so the default-address-space pointer is 32 bits wide before the
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// IR is handed off to `clifter`.
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//
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// Two preconditions must hold for the rewrite to be valid:
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//
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// 1. No scalar `alloca`'s allocated type transitively contains an
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// `llvm::PointerType`. Pointer-typed allocas would silently shrink
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// from 8 to 4 bytes when the DataLayout changes; pointer values must
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// instead live in integer-typed allocas and be bitcast (via
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// `ptrtoint`/`inttoptr`) at load/store boundaries.
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//
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// 2. No `getelementptr` has a source type that transitively contains an
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// `llvm::PointerType`. Otherwise the GEP's byte offsets would shift
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// under the new DataLayout.
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//
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// Both preconditions are checked with hard assertions; the pipe aborts if
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// either fails. The DataLayout rewrite is a no-op for targets whose pointer
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// is not 32 bits wide.
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class FixPointerSize {
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public:
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static constexpr llvm::StringRef Name = "fix-pointer-size";
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using Arguments = TypeList<PipeArgument<"Module",
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"LLVM Modules whose pointer size "
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"needs to match the "
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"target architecture">>;
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const std::string StaticConfiguration;
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FixPointerSize(llvm::StringRef StaticConfiguration) :
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StaticConfiguration(StaticConfiguration) {}
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PipeOutput run(const Model &TheModel,
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const revng::pypeline::Request &Incoming,
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const revng::pypeline::Request &Outgoing,
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llvm::StringRef Configuration,
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LLVMFunctionContainer &Container);
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};
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} // namespace revng::pypeline::pipes
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