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Add support for undef, unreachable, and function flags

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17054 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2004-10-16 18:18:16 +00:00
parent 16710e9574
commit a79e7cca0d
3 changed files with 99 additions and 36 deletions
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18
lib/Bytecode/Reader/Reader.h
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@@ -298,17 +298,29 @@ private:
/// alignment of bytecode fields was done away with completely.
bool hasAlignment;
// In version 4, basic blocks have a minimum index of 0 whereas all the
// In version 4 and earlier, the bytecode format did not support the 'undef'
// constant.
bool hasNoUndefValue;
// In version 4 and earlier, the bytecode format did not save space for flags
// in the global info block for functions.
bool hasNoFlagsForFunctions;
// In version 4 and earlier, there was no opcode space reserved for the
// unreachable instruction.
bool hasNoUnreachableInst;
// In version 5, basic blocks have a minimum index of 0 whereas all the
// other primitives have a minimum index of 1 (because 0 is the "null"
// value. In version 5, we made this consistent.
bool hasInconsistentBBSlotNums;
// In version 4, the types SByte and UByte were encoded as vbr_uint so that
// In version 5, the types SByte and UByte were encoded as vbr_uint so that
// signed values > 63 and unsigned values >127 would be encoded as two
// bytes. In version 5, they are encoded directly in a single byte.
bool hasVBRByteTypes;
// In version 4, modules begin with a "Module Block" which encodes a 4-byte
// In version 5, modules begin with a "Module Block" which encodes a 4-byte
// integer value 0x01 to identify the module block. This is unnecessary and
// removed in version 5.
bool hasUnnecessaryModuleBlockId;