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IR: Add helper to split debug info flags bitfield

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Split debug info 'flags' bitfield over a vector so the current flags can
be iterated over.  This API (in combination with r230107) will be used
for assembly support for symbolic constants.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230108 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith 2015-02-21 00:45:26 +00:00
parent 2e19fabc26
commit 8629ae24e7
3 changed files with 52 additions and 0 deletions
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7
include/llvm/IR/DebugInfo.h
View File

@ -140,6 +140,13 @@ public:
static unsigned getFlag(StringRef Flag);
static const char *getFlagString(unsigned Flag);
/// \brief Split up a flags bitfield.
///
/// Split \c Flags into \c SplitFlags, a vector of its components. Returns
/// any remaining (unrecognized) bits.
static unsigned splitFlags(unsigned Flags,
SmallVectorImpl<unsigned> &SplitFlags);
protected:
const MDNode *DbgNode;

24
lib/IR/DebugInfo.cpp
View File

@ -55,6 +55,30 @@ const char *DIDescriptor::getFlagString(unsigned Flag) {
}
}
unsigned DIDescriptor::splitFlags(unsigned Flags,
SmallVectorImpl<unsigned> &SplitFlags) {
// Accessibility flags need to be specially handled, since they're packed
// together.
if (unsigned A = Flags & FlagAccessibility) {
if (A == FlagPrivate)
SplitFlags.push_back(FlagPrivate);
else if (A == FlagProtected)
SplitFlags.push_back(FlagProtected);
else
SplitFlags.push_back(FlagPublic);
Flags &= ~A;
}
#define HANDLE_DI_FLAG(ID, NAME) \
if (unsigned Bit = Flags & ID) { \
SplitFlags.push_back(Bit); \
Flags &= ~Bit; \
}
#include "llvm/IR/DebugInfoFlags.def"
return Flags;
}
bool DIDescriptor::Verify() const {
return DbgNode &&
(DIDerivedType(DbgNode).Verify() ||

21
unittests/IR/DebugInfoTest.cpp
View File

@ -111,4 +111,25 @@ TEST(DIDescriptorTest, getFlagString) {
EXPECT_EQ(StringRef(), DIDescriptor::getFlagString(0xffff));
}
TEST(DIDescriptorTest, splitFlags) {
// Some valid flags.
#define CHECK_SPLIT(FLAGS, VECTOR, REMAINDER) \
{ \
SmallVector<unsigned, 8> V; \
EXPECT_EQ(REMAINDER, DIDescriptor::splitFlags(FLAGS, V)); \
EXPECT_TRUE(makeArrayRef(V).equals VECTOR); \
}
CHECK_SPLIT(DIDescriptor::FlagPublic, (DIDescriptor::FlagPublic), 0u);
CHECK_SPLIT(DIDescriptor::FlagProtected, (DIDescriptor::FlagProtected), 0u);
CHECK_SPLIT(DIDescriptor::FlagPrivate, (DIDescriptor::FlagPrivate), 0u);
CHECK_SPLIT(DIDescriptor::FlagVector, (DIDescriptor::FlagVector), 0u);
CHECK_SPLIT(DIDescriptor::FlagRValueReference, (DIDescriptor::FlagRValueReference), 0u);
CHECK_SPLIT(DIDescriptor::FlagFwdDecl | DIDescriptor::FlagVector,
(DIDescriptor::FlagFwdDecl, DIDescriptor::FlagVector), 0u);
CHECK_SPLIT(0x100000u, (), 0x100000u);
CHECK_SPLIT(0x100000u | DIDescriptor::FlagVector, (DIDescriptor::FlagVector),
0x100000u);
#undef CHECK_SPLIT
}
} // end namespace