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Add an empty key for DebugLoc so that you can store an empty DebugLoc in a

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DenseMap.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128994 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2011-04-06 06:49:59 +00:00
parent 49123fd58c
commit 4841121580
2 changed files with 12 additions and 4 deletions
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14
include/llvm/Support/DebugLoc.h
View File

@ -27,14 +27,22 @@ namespace llvm {
class DebugLoc {
friend struct DenseMapInfo<DebugLoc>;
/// getTombstoneKey() - A private constructor that returns an unknown that
/// is distinguishable from the usual one.
static DebugLoc getTombstoneKey() {
/// getEmptyKey() - A private constructor that returns an unknown that is
/// not equal to the tombstone key or DebugLoc().
static DebugLoc getEmptyKey() {
DebugLoc DL;
DL.LineCol = -1;
return DL;
}
/// getTombstoneKey() - A private constructor that returns an unknown that
/// is not equal to the empty key or DebugLoc().
static DebugLoc getTombstoneKey() {
DebugLoc DL;
DL.LineCol = -2;
return DL;
}
/// LineCol - This 32-bit value encodes the line and column number for the
/// location, encoded as 24-bits for line and 8 bits for col. A value of 0
/// for either means unknown.

2
lib/VMCore/DebugLoc.cpp
View File

@ -133,7 +133,7 @@ DebugLoc DebugLoc::getFromDILocation(MDNode *N) {
//===----------------------------------------------------------------------===//
DebugLoc DenseMapInfo<DebugLoc>::getEmptyKey() {
return DebugLoc();
return DebugLoc::getEmptyKey();
}
DebugLoc DenseMapInfo<DebugLoc>::getTombstoneKey() {