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DebugInfo: Simplify gnu_pubnames index computation.

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Names open to bikeshedding. Could switch back to the constants being
unshifted, but this way seems a bit easier to work with.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191025 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie
2013-09-19 18:39:59 +00:00
parent cdfb43f0a6
commit ecb41cfe36
2 changed files with 28 additions and 56 deletions
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39
include/llvm/Support/Dwarf.h
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@ -791,37 +791,34 @@ const char *AtomTypeString(unsigned Atom);
// Constants for the GNU pubnames/pubtypes extensions supporting gdb index.
enum GDBIndex {
// The full index looks like this for each symbol:
// The gnu_pub* index value looks like:
//
// 0-23 CU index
// 24-27 reserved
// 28-30 symbol kind
// 31 0 == global, 1 == static
//
// where each entry refers to the CU and some attributes about the symbol.
// 0-3 reserved
// 4-6 symbol kind
// 7 0 == global, 1 == static
// Attributes kinds for the index.
GDB_INDEX_SYMBOL_KIND_OFFSET = 4,
GDB_INDEX_SYMBOL_KIND_MASK = 7 << GDB_INDEX_SYMBOL_KIND_OFFSET,
// Special value to indicate no attributes are present.
GDB_INDEX_SYMBOL_KIND_NONE = 0,
GDB_INDEX_SYMBOL_KIND_TYPE = 1,
GDB_INDEX_SYMBOL_KIND_VARIABLE = 2,
GDB_INDEX_SYMBOL_KIND_FUNCTION = 3,
GDB_INDEX_SYMBOL_KIND_OTHER = 4,
// 3 unused bits.
GDB_INDEX_SYMBOL_KIND_UNUSED5 = 5,
GDB_INDEX_SYMBOL_KIND_UNUSED6 = 6,
GDB_INDEX_SYMBOL_KIND_UNUSED7 = 7,
GDB_INDEX_SYMBOL_KIND_TYPE = 1 << GDB_INDEX_SYMBOL_KIND_OFFSET,
GDB_INDEX_SYMBOL_KIND_VARIABLE = 2 << GDB_INDEX_SYMBOL_KIND_OFFSET,
GDB_INDEX_SYMBOL_KIND_FUNCTION = 3 << GDB_INDEX_SYMBOL_KIND_OFFSET,
GDB_INDEX_SYMBOL_KIND_OTHER = 4 << GDB_INDEX_SYMBOL_KIND_OFFSET,
// 3 unused values.
GDB_INDEX_SYMBOL_KIND_UNUSED5 = 5 << GDB_INDEX_SYMBOL_KIND_OFFSET,
GDB_INDEX_SYMBOL_KIND_UNUSED6 = 6 << GDB_INDEX_SYMBOL_KIND_OFFSET,
GDB_INDEX_SYMBOL_KIND_UNUSED7 = 7 << GDB_INDEX_SYMBOL_KIND_OFFSET,
// Index values are defined via the set of CUs that define the
// symbol. For the pubnames/pubtypes extensions we need the
// various shifts and masks.
GDB_INDEX_SYMBOL_STATIC_SHIFT = 31,
GDB_INDEX_SYMBOL_STATIC_MASK = 1,
GDB_INDEX_SYMBOL_KIND_SHIFT = 28,
GDB_INDEX_SYMBOL_KIND_MASK = 7,
GDB_INDEX_CU_BITSIZE = 24,
GDB_INDEX_CU_MASK = ((1 << GDB_INDEX_CU_BITSIZE) - 1)
GDB_INDEX_SYMBOL_STATIC_OFFSET = 7,
GDB_INDEX_SYMBOL_STATIC_MASK = 1 << GDB_INDEX_SYMBOL_STATIC_OFFSET,
GDB_INDEX_SYMBOL_STATIC = 1 << GDB_INDEX_SYMBOL_STATIC_OFFSET,
GDB_INDEX_SYMBOL_NON_STATIC = 0
};
/// GDBIndexTypeString - Return the string for the specified index type.