//
//===----------------------------------------------------------------------===//
+#ifndef CODEGEN_ASMPRINTER_DIEHASH_H__
+#define CODEGEN_ASMPRINTER_DIEHASH_H__
+
+#include "DIE.h"
+#include "llvm/ADT/DenseMap.h"
#include "llvm/Support/MD5.h"
namespace llvm {
+class AsmPrinter;
class CompileUnit;
/// \brief An object containing the capability of hashing and adding hash
/// attributes onto a DIE.
class DIEHash {
+
+ // The entry for a particular attribute.
+ struct AttrEntry {
+ const DIEValue *Val;
+ const DIEAbbrevData *Desc;
+ };
+
+ // Collection of all attributes used in hashing a particular DIE.
+ struct DIEAttrs {
+ AttrEntry DW_AT_name;
+ AttrEntry DW_AT_accessibility;
+ AttrEntry DW_AT_address_class;
+ AttrEntry DW_AT_allocated;
+ AttrEntry DW_AT_artificial;
+ AttrEntry DW_AT_associated;
+ AttrEntry DW_AT_binary_scale;
+ AttrEntry DW_AT_bit_offset;
+ AttrEntry DW_AT_bit_size;
+ AttrEntry DW_AT_bit_stride;
+ AttrEntry DW_AT_byte_size;
+ AttrEntry DW_AT_byte_stride;
+ AttrEntry DW_AT_const_expr;
+ AttrEntry DW_AT_const_value;
+ AttrEntry DW_AT_containing_type;
+ AttrEntry DW_AT_count;
+ AttrEntry DW_AT_data_bit_offset;
+ AttrEntry DW_AT_data_location;
+ AttrEntry DW_AT_data_member_location;
+ AttrEntry DW_AT_decimal_scale;
+ AttrEntry DW_AT_decimal_sign;
+ AttrEntry DW_AT_default_value;
+ AttrEntry DW_AT_digit_count;
+ AttrEntry DW_AT_discr;
+ AttrEntry DW_AT_discr_list;
+ AttrEntry DW_AT_discr_value;
+ AttrEntry DW_AT_encoding;
+ AttrEntry DW_AT_enum_class;
+ AttrEntry DW_AT_endianity;
+ AttrEntry DW_AT_explicit;
+ AttrEntry DW_AT_is_optional;
+ AttrEntry DW_AT_location;
+ AttrEntry DW_AT_lower_bound;
+ AttrEntry DW_AT_mutable;
+ AttrEntry DW_AT_ordering;
+ AttrEntry DW_AT_picture_string;
+ AttrEntry DW_AT_prototyped;
+ AttrEntry DW_AT_small;
+ AttrEntry DW_AT_segment;
+ AttrEntry DW_AT_string_length;
+ AttrEntry DW_AT_threads_scaled;
+ AttrEntry DW_AT_upper_bound;
+ AttrEntry DW_AT_use_location;
+ AttrEntry DW_AT_use_UTF8;
+ AttrEntry DW_AT_variable_parameter;
+ AttrEntry DW_AT_virtuality;
+ AttrEntry DW_AT_visibility;
+ AttrEntry DW_AT_vtable_elem_location;
+ AttrEntry DW_AT_type;
+
+ // Insert any additional ones here...
+ };
+
public:
- /// \brief Computes the ODR signature
- uint64_t computeDIEODRSignature(DIE *Die);
+ DIEHash(AsmPrinter *A = NULL) : AP(A) {}
+
+ /// \brief Computes the ODR signature.
+ uint64_t computeDIEODRSignature(const DIE &Die);
+
+ /// \brief Computes the CU signature.
+ uint64_t computeCUSignature(const DIE &Die);
+
+ /// \brief Computes the type signature.
+ uint64_t computeTypeSignature(const DIE &Die);
// Helper routines to process parts of a DIE.
- private:
+private:
/// \brief Adds the parent context of \param Die to the hash.
- void addParentContext(DIE *Die);
-
+ void addParentContext(const DIE &Die);
+
+ /// \brief Adds the attributes of \param Die to the hash.
+ void addAttributes(const DIE &Die);
+
+ /// \brief Computes the full DWARF4 7.27 hash of the DIE.
+ void computeHash(const DIE &Die);
+
// Routines that add DIEValues to the hash.
-private:
+public:
+ /// \brief Adds \param Value to the hash.
+ void update(uint8_t Value) { Hash.update(Value); }
+
/// \brief Encodes and adds \param Value to the hash as a ULEB128.
void addULEB128(uint64_t Value);
+ /// \brief Encodes and adds \param Value to the hash as a SLEB128.
+ void addSLEB128(int64_t Value);
+
+private:
/// \brief Adds \param Str to the hash and includes a NULL byte.
void addString(StringRef Str);
-
+
+ /// \brief Collects the attributes of DIE \param Die into the \param Attrs
+ /// structure.
+ void collectAttributes(const DIE &Die, DIEAttrs &Attrs);
+
+ /// \brief Hashes the attributes in \param Attrs in order.
+ void hashAttributes(const DIEAttrs &Attrs, dwarf::Tag Tag);
+
+ /// \brief Hashes the data in a block like DIEValue, e.g. DW_FORM_block or
+ /// DW_FORM_exprloc.
+ void hashBlockData(const SmallVectorImpl<DIEValue *> &Values);
+
+ /// \brief Hashes the contents pointed to in the .debug_loc section.
+ void hashLocList(const DIELocList &LocList);
+
+ /// \brief Hashes an individual attribute.
+ void hashAttribute(AttrEntry Attr, dwarf::Tag Tag);
+
+ /// \brief Hashes an attribute that refers to another DIE.
+ void hashDIEEntry(dwarf::Attribute Attribute, dwarf::Tag Tag,
+ const DIE &Entry);
+
+ /// \brief Hashes a reference to a named type in such a way that is
+ /// independent of whether that type is described by a declaration or a
+ /// definition.
+ void hashShallowTypeReference(dwarf::Attribute Attribute, const DIE &Entry,
+ StringRef Name);
+
+ /// \brief Hashes a reference to a previously referenced type DIE.
+ void hashRepeatedTypeReference(dwarf::Attribute Attribute,
+ unsigned DieNumber);
+
+ void hashNestedType(const DIE &Die, StringRef Name);
+
private:
MD5 Hash;
+ AsmPrinter *AP;
+ DenseMap<const DIE *, unsigned> Numbering;
};
}
+
+#endif