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Change `DIE::Values` to a singly linked list, where each node is allocated on a `BumpPtrAllocator`. In order to support `push_back()`, the list is circular, and points at the tail element instead of the head. I abstracted the core list logic out to `IntrusiveBackList` so that it can be reused for `DIE::Children`, which also cares about `push_back()`. This drops llc memory usage from 799 MB down to 735 MB, about 8%. (I'm looking at `llc` memory usage on `verify-uselistorder.lto.opt.bc`; see r236629 for details.) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240733 91177308-0d34-0410-b5e6-96231b3b80d8
163 lines
5.0 KiB
C++
163 lines
5.0 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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DIEValue DW_AT_name;
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DIEValue DW_AT_accessibility;
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DIEValue DW_AT_address_class;
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DIEValue DW_AT_allocated;
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DIEValue DW_AT_artificial;
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DIEValue DW_AT_associated;
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DIEValue DW_AT_binary_scale;
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DIEValue DW_AT_bit_offset;
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DIEValue DW_AT_bit_size;
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DIEValue DW_AT_bit_stride;
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DIEValue DW_AT_byte_size;
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DIEValue DW_AT_byte_stride;
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DIEValue DW_AT_const_expr;
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DIEValue DW_AT_const_value;
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DIEValue DW_AT_containing_type;
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DIEValue DW_AT_count;
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DIEValue DW_AT_data_bit_offset;
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DIEValue DW_AT_data_location;
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DIEValue DW_AT_data_member_location;
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DIEValue DW_AT_decimal_scale;
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DIEValue DW_AT_decimal_sign;
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DIEValue DW_AT_default_value;
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DIEValue DW_AT_digit_count;
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DIEValue DW_AT_discr;
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DIEValue DW_AT_discr_list;
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DIEValue DW_AT_discr_value;
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DIEValue DW_AT_encoding;
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DIEValue DW_AT_enum_class;
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DIEValue DW_AT_endianity;
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DIEValue DW_AT_explicit;
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DIEValue DW_AT_is_optional;
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DIEValue DW_AT_location;
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DIEValue DW_AT_lower_bound;
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DIEValue DW_AT_mutable;
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DIEValue DW_AT_ordering;
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DIEValue DW_AT_picture_string;
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DIEValue DW_AT_prototyped;
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DIEValue DW_AT_small;
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DIEValue DW_AT_segment;
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DIEValue DW_AT_string_length;
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DIEValue DW_AT_threads_scaled;
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DIEValue DW_AT_upper_bound;
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DIEValue DW_AT_use_location;
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DIEValue DW_AT_use_UTF8;
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DIEValue DW_AT_variable_parameter;
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DIEValue DW_AT_virtuality;
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DIEValue DW_AT_visibility;
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DIEValue DW_AT_vtable_elem_location;
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DIEValue DW_AT_type;
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// Insert any additional ones here...
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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 ODR signature.
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uint64_t computeDIEODRSignature(const DIE &Die);
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/// \brief Computes the CU signature.
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uint64_t computeCUSignature(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(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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