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DebugInfo: Simplify gnu_pubnames index computation. 

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

llvm-svn: 191025
This commit is contained in:
David Blaikie 2013-09-19 18:39:59 +00:00
parent 8bf05566d7
commit b20db58a4d
2 changed files with 28 additions and 56 deletions
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39
llvm/include/llvm/Support/Dwarf.h
View File

@ -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.

45
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -2323,21 +2323,9 @@ void DwarfDebug::emitAccelTypes() {
/// computeIndexValue - Compute the gdb index value for the DIE and CU.
static uint8_t computeIndexValue(CompileUnit *CU, DIE *Die) {
#define UPDATE_VALUE(CURRENT, VALUE) \
{ \
(CURRENT) |= (((VALUE) & dwarf::GDB_INDEX_SYMBOL_KIND_MASK) \
<< dwarf::GDB_INDEX_SYMBOL_KIND_SHIFT); \
}
#define UPDATE_STATIC(CURRENT, IS_STATIC) \
{ \
(CURRENT) |= (((IS_STATIC) & dwarf::GDB_INDEX_SYMBOL_STATIC_MASK) \
<< dwarf::GDB_INDEX_SYMBOL_STATIC_SHIFT); \
}
// Compute the Attributes for the Die.
uint32_t Value = dwarf::GDB_INDEX_SYMBOL_KIND_NONE;
bool External = Die->findAttribute(dwarf::DW_AT_external);
uint8_t IsStatic = Die->findAttribute(dwarf::DW_AT_external)
? dwarf::GDB_INDEX_SYMBOL_NON_STATIC
: dwarf::GDB_INDEX_SYMBOL_STATIC;
switch (Die->getTag()) {
case dwarf::DW_TAG_class_type:
@ -2347,33 +2335,20 @@ static uint8_t computeIndexValue(CompileUnit *CU, DIE *Die) {
case dwarf::DW_TAG_typedef:
case dwarf::DW_TAG_base_type:
case dwarf::DW_TAG_subrange_type:
UPDATE_VALUE(Value, dwarf::GDB_INDEX_SYMBOL_KIND_TYPE);
UPDATE_STATIC(Value, 1);
break;
return dwarf::GDB_INDEX_SYMBOL_KIND_TYPE | dwarf::GDB_INDEX_SYMBOL_STATIC;
case dwarf::DW_TAG_namespace:
UPDATE_VALUE(Value, dwarf::GDB_INDEX_SYMBOL_KIND_TYPE);
break;
return dwarf::GDB_INDEX_SYMBOL_KIND_TYPE;
case dwarf::DW_TAG_subprogram:
UPDATE_VALUE(Value, dwarf::GDB_INDEX_SYMBOL_KIND_FUNCTION);
UPDATE_STATIC(Value, !External);
break;
return dwarf::GDB_INDEX_SYMBOL_KIND_FUNCTION | IsStatic;
case dwarf::DW_TAG_constant:
case dwarf::DW_TAG_variable:
UPDATE_VALUE(Value, dwarf::GDB_INDEX_SYMBOL_KIND_VARIABLE);
UPDATE_STATIC(Value, !External);
break;
return dwarf::GDB_INDEX_SYMBOL_KIND_VARIABLE | IsStatic;
case dwarf::DW_TAG_enumerator:
UPDATE_VALUE(Value, dwarf::GDB_INDEX_SYMBOL_KIND_VARIABLE);
UPDATE_STATIC(Value, 1);
break;
return dwarf::GDB_INDEX_SYMBOL_KIND_VARIABLE |
dwarf::GDB_INDEX_SYMBOL_STATIC;
default:
break;
return dwarf::GDB_INDEX_SYMBOL_KIND_NONE;
}
// We don't need to add the CU into the bitmask for two reasons:
// a) the pubnames/pubtypes sections are per-cu, and
// b) the linker wouldn't understand it anyhow.
// so go ahead and make it 1 byte by shifting it down.
return Value >> dwarf::GDB_INDEX_CU_BITSIZE;
}
/// emitDebugPubNames - Emit visible names into a debug pubnames section.