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ccf1daccce
This is really a workaround for ThinLTO in particular - since it can import partial CUs that may end up looking very similar/the same as the same partial import in another ThinLTO compile. An alternative fix would be to change the DICompileUnit metadata to include a "primary file" or the like - and when importing for ThinLTO set the primary file to the name of the DICompileUnit that is being imported into. This involves changing the schema and would reduce the excessive uniqueness in the hash that this change creates - allowing diagnosing of more duplicate CUs than will be caught with this change. But duplicate CUs can still be caught in non-ThinLTO builds & are mostly a nuisance rather than a particularly deliberate/effective tool for finding broken code. (arguably the hash could always include the dwo file and nothing in fission would break, I think..) Reapply of r304119 after adding a triple to the test and moving it to the X86 directory. llvm-svn: 304130
111 lines
3.5 KiB
C++
111 lines
3.5 KiB
C++
//===-- llvm/CodeGen/DIEHash.h - Dwarf Hashing Framework -------*- C++ -*--===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains support for DWARF4 hashing of DIEs.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DIEHASH_H
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#define LLVM_LIB_CODEGEN_ASMPRINTER_DIEHASH_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/CodeGen/DIE.h"
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#include "llvm/Support/MD5.h"
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namespace llvm {
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class AsmPrinter;
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class CompileUnit;
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/// \brief An object containing the capability of hashing and adding hash
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/// attributes onto a DIE.
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class DIEHash {
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// Collection of all attributes used in hashing a particular DIE.
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struct DIEAttrs {
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#define HANDLE_DIE_HASH_ATTR(NAME) DIEValue NAME;
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#include "DIEHashAttributes.def"
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};
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public:
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DIEHash(AsmPrinter *A = nullptr) : AP(A) {}
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/// \brief Computes the CU signature.
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uint64_t computeCUSignature(StringRef DWOName, const DIE &Die);
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/// \brief Computes the type signature.
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uint64_t computeTypeSignature(const DIE &Die);
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// Helper routines to process parts of a DIE.
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private:
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/// \brief Adds the parent context of \param Die to the hash.
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void addParentContext(const DIE &Die);
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/// \brief Adds the attributes of \param Die to the hash.
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void addAttributes(const DIE &Die);
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/// \brief Computes the full DWARF4 7.27 hash of the DIE.
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void computeHash(const DIE &Die);
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// Routines that add DIEValues to the hash.
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public:
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/// \brief Adds \param Value to the hash.
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void update(uint8_t Value) { Hash.update(Value); }
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/// \brief Encodes and adds \param Value to the hash as a ULEB128.
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void addULEB128(uint64_t Value);
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/// \brief Encodes and adds \param Value to the hash as a SLEB128.
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void addSLEB128(int64_t Value);
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private:
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/// \brief Adds \param Str to the hash and includes a NULL byte.
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void addString(StringRef Str);
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/// \brief Collects the attributes of DIE \param Die into the \param Attrs
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/// structure.
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void collectAttributes(const DIE &Die, DIEAttrs &Attrs);
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/// \brief Hashes the attributes in \param Attrs in order.
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void hashAttributes(const DIEAttrs &Attrs, dwarf::Tag Tag);
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/// \brief Hashes the data in a block like DIEValue, e.g. DW_FORM_block or
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/// DW_FORM_exprloc.
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void hashBlockData(const DIE::const_value_range &Values);
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/// \brief Hashes the contents pointed to in the .debug_loc section.
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void hashLocList(const DIELocList &LocList);
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/// \brief Hashes an individual attribute.
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void hashAttribute(const DIEValue &Value, dwarf::Tag Tag);
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/// \brief Hashes an attribute that refers to another DIE.
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void hashDIEEntry(dwarf::Attribute Attribute, dwarf::Tag Tag,
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const DIE &Entry);
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/// \brief Hashes a reference to a named type in such a way that is
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/// independent of whether that type is described by a declaration or a
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/// definition.
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void hashShallowTypeReference(dwarf::Attribute Attribute, const DIE &Entry,
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StringRef Name);
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/// \brief Hashes a reference to a previously referenced type DIE.
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void hashRepeatedTypeReference(dwarf::Attribute Attribute,
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unsigned DieNumber);
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void hashNestedType(const DIE &Die, StringRef Name);
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private:
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MD5 Hash;
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AsmPrinter *AP;
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DenseMap<const DIE *, unsigned> Numbering;
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};
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}
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#endif
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