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add supprot for FP constants, wide integers, and fix the encoding of MININT

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36390 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-04-24 04:04:35 +00:00
parent e16504eb4e
commit 0eef08046e
1 changed files with 40 additions and 8 deletions
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48
lib/Bitcode/Reader/BitcodeReader.cpp
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@ -17,6 +17,7 @@
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/MathExtras.h"
using namespace llvm;
/// ConvertToString - Convert a string from a record into an std::string, return
@ -204,8 +205,8 @@ bool BitcodeReader::ParseTypeTable(BitstreamReader &Stream) {
const_cast<OpaqueType*>(OldTy)->refineAbstractTypeTo(ResultTy);
// This should have replaced the old opaque type with the new type in the
// value table... or with a preexisting type that was already in the system.
// Let's just make sure it did.
// value table... or with a preexisting type that was already in the
// system. Let's just make sure it did.
assert(TypeList[NumRecords-1].get() != OldTy &&
"refineAbstractType didn't work!");
}
@ -304,6 +305,17 @@ bool BitcodeReader::ParseValueSymbolTable(BitstreamReader &Stream) {
}
}
/// DecodeSignRotatedValue - Decode a signed value stored with the sign bit in
/// the LSB for dense VBR encoding.
static uint64_t DecodeSignRotatedValue(uint64_t V) {
if ((V & 1) == 0)
return V >> 1;
if (V != 1)
return -(V >> 1);
// There is no such thing as -0 with integers. "-0" really means MININT.
return 1ULL << 63;
}
bool BitcodeReader::ParseConstants(BitstreamReader &Stream) {
if (Stream.EnterSubBlock())
return Error("Malformed block record");
@ -359,17 +371,37 @@ bool BitcodeReader::ParseConstants(BitstreamReader &Stream) {
if (Record[0] >= TypeList.size())
return Error("Invalid Type ID in CST_SETTYPE record");
CurTy = TypeList[Record[0]];
continue;
continue; // Skip the ValueList manipulation.
case bitc::CST_CODE_NULL: // NULL
V = Constant::getNullValue(CurTy);
break;
case bitc::CST_CODE_INTEGER: // INTEGER: [intval]
if (!isa<IntegerType>(CurTy))
return Error("Invalid type for CST_INTEGER");
if (Record[0] & 1)
V = ConstantInt::get(CurTy, -(Record[0]>>1));
if (!isa<IntegerType>(CurTy) || Record.empty())
return Error("Invalid CST_INTEGER record");
V = ConstantInt::get(CurTy, DecodeSignRotatedValue(Record[0]));
break;
case bitc::CST_CODE_WIDE_INTEGER: {// WIDE_INTEGER: [n, n x intval]
if (!isa<IntegerType>(CurTy) || Record.empty() ||
Record.size() < Record[0]+1)
return Error("Invalid WIDE_INTEGER record");
unsigned NumWords = Record[0];
uint64_t *Data = new uint64_t[NumWords];
for (unsigned i = 0; i != NumWords; ++i)
Data[i] = DecodeSignRotatedValue(Record[i+1]);
V = ConstantInt::get(APInt(cast<IntegerType>(CurTy)->getBitWidth(),
NumWords, Data));
break;
}
case bitc::CST_CODE_FLOAT: // FLOAT: [fpval]
if (Record.empty())
return Error("Invalid FLOAT record");
if (CurTy == Type::FloatTy)
V = ConstantFP::get(CurTy, BitsToFloat(Record[0]));
else if (CurTy == Type::DoubleTy)
V = ConstantFP::get(CurTy, BitsToDouble(Record[0]));
else
V = ConstantInt::get(CurTy, Record[0]>>1);
V = UndefValue::get(CurTy);
break;
}