95 lines
3.3 KiB
C++
95 lines
3.3 KiB
C++
//===--------- EHFrameSupport.h - JITLink eh-frame utils --------*- C++ -*-===//
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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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//
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// EHFrame registration support for JITLink.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORT_H
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#define LLVM_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORT_H
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#include "llvm/ExecutionEngine/JITLink/JITLink.h"
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#include "llvm/ExecutionEngine/JITSymbol.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Error.h"
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#include "llvm/TargetParser/Triple.h"
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namespace llvm {
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namespace jitlink {
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/// Inspect an eh-frame CFI record.
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class EHFrameCFIBlockInspector {
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public:
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/// Identify CFI record type and edges based on number and order of edges
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/// in the given block only. This assumes that the block contains one CFI
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/// record that has already been split out and fixed by the
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/// DWARFRecordSplitter and EHFrameEdgeFixer passes.
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///
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/// Zero or one outgoing edges: Record is CIE. If present, edge points to
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/// personality.
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///
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/// Two or three outgoing edges: Record is an FDE. First edge points to CIE,
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/// second to PC-begin, third (if present) to LSDA.
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///
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/// It is illegal to call this function on a block with four or more edges.
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LLVM_ABI static EHFrameCFIBlockInspector FromEdgeScan(Block &B);
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/// Returns true if this frame is an FDE, false for a CIE.
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bool isFDE() const { return CIEEdge != nullptr; }
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/// Returns true if this frame is a CIE, false for an FDE.
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bool isCIE() const { return CIEEdge == nullptr; }
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/// If this is a CIE record, returns the Edge pointing at the personality
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/// function, if any.
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/// It is illegal to call this method on FDE records.
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Edge *getPersonalityEdge() const {
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assert(isCIE() && "CFI record is not a CIE");
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return PersonalityEdge;
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}
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/// If this is an FDE record, returns the Edge pointing to the CIE.
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/// If this is a CIE record, returns null.
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///
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/// The result is not valid if any modification has been made to the block
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/// after parsing.
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Edge *getCIEEdge() const { return CIEEdge; }
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/// If this is an FDE record, returns the Edge pointing at the PC-begin
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/// symbol.
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/// If this a CIE record, returns null.
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Edge *getPCBeginEdge() const { return PCBeginEdge; }
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/// If this is an FDE record, returns the Edge pointing at the LSDA, if any.
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/// It is illegal to call this method on CIE records.
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Edge *getLSDAEdge() const {
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assert(isFDE() && "CFI record is not an FDE");
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return LSDAEdge;
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}
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private:
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EHFrameCFIBlockInspector(Edge *PersonalityEdge);
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EHFrameCFIBlockInspector(Edge &CIEEdge, Edge &PCBeginEdge, Edge *LSDAEdge);
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Edge *CIEEdge = nullptr;
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Edge *PCBeginEdge = nullptr;
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union {
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Edge *PersonalityEdge;
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Edge *LSDAEdge;
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};
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};
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/// Returns a pointer to the DWARF eh-frame section if the graph contains a
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/// non-empty one, otherwise returns null.
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LLVM_ABI Section *getEHFrameSection(LinkGraph &G);
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} // end namespace jitlink
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} // end namespace llvm
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#endif // LLVM_EXECUTIONENGINE_JITLINK_EHFRAMESUPPORT_H
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