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