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add some optional flags to affect the way advance works.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172928 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2013-01-19 23:31:15 +00:00
parent 00a312c478
commit 344fc23d23
1 changed files with 9 additions and 4 deletions
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13
include/llvm/Bitcode/BitstreamReader.h
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@ -269,14 +269,19 @@ public:
return BitStream; return BitStream;
} }
/// Flags that modify the behavior of advance().
enum {
AF_DontPopBlockAtEnd = 1
};
/// advance - Advance the current bitstream, returning the next entry in the /// advance - Advance the current bitstream, returning the next entry in the
/// stream. /// stream.
BitstreamEntry advance() { BitstreamEntry advance(unsigned Flags = 0) {
while (1) { while (1) {
unsigned Code = ReadCode(); unsigned Code = ReadCode();
if (Code == bitc::END_BLOCK) { if (Code == bitc::END_BLOCK) {
if (ReadBlockEnd()) // Pop the end of the block unless Flags tells us not to.
if (!(Flags & AF_DontPopBlockAtEnd) && ReadBlockEnd())
return BitstreamEntry::getError(); return BitstreamEntry::getError();
return BitstreamEntry::getEndBlock(); return BitstreamEntry::getEndBlock();
} }
@ -297,10 +302,10 @@ public:
/// advanceSkippingSubblocks - This is a convenience function for clients that /// advanceSkippingSubblocks - This is a convenience function for clients that
/// don't expect any subblocks. This just skips over them automatically. /// don't expect any subblocks. This just skips over them automatically.
BitstreamEntry advanceSkippingSubblocks() { BitstreamEntry advanceSkippingSubblocks(unsigned Flags = 0) {
while (1) { while (1) {
// If we found a normal entry, return it. // If we found a normal entry, return it.
BitstreamEntry Entry = advance(); BitstreamEntry Entry = advance(Flags);
if (Entry.Kind != BitstreamEntry::SubBlock) if (Entry.Kind != BitstreamEntry::SubBlock)
return Entry; return Entry;