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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65199 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Misha Brukman
2009-02-20 23:04:06 +00:00
parent 085a9ebbc7
commit d3ff4a188e
10 changed files with 314 additions and 314 deletions
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include/llvm/Bitcode/BitstreamWriter.h
+56 -56
View File
@@ -25,10 +25,10 @@ class BitstreamWriter {
/// CurBit - Always between 0 and 31 inclusive, specifies the next bit to use.
unsigned CurBit;
/// CurValue - The current value. Only bits < CurBit are valid.
uint32_t CurValue;
/// CurCodeSize - This is the declared size of code values used for the
/// current block, in bits.
unsigned CurCodeSize;
@@ -36,7 +36,7 @@ class BitstreamWriter {
/// BlockInfoCurBID - When emitting a BLOCKINFO_BLOCK, this is the currently
/// selected BLOCK ID.
unsigned BlockInfoCurBID;
/// CurAbbrevs - Abbrevs installed at in this block.
std::vector<BitCodeAbbrev*> CurAbbrevs;
@@ -46,10 +46,10 @@ class BitstreamWriter {
std::vector<BitCodeAbbrev*> PrevAbbrevs;
Block(unsigned PCS, unsigned SSW) : PrevCodeSize(PCS), StartSizeWord(SSW) {}
};
/// BlockScope - This tracks the current blocks that we have entered.
std::vector<Block> BlockScope;
/// BlockInfo - This contains information emitted to BLOCKINFO_BLOCK blocks.
/// These describe abbreviations that all blocks of the specified ID inherit.
struct BlockInfo {
@@ -57,15 +57,15 @@ class BitstreamWriter {
std::vector<BitCodeAbbrev*> Abbrevs;
};
std::vector<BlockInfo> BlockInfoRecords;
public:
explicit BitstreamWriter(std::vector<unsigned char> &O)
explicit BitstreamWriter(std::vector<unsigned char> &O)
: Out(O), CurBit(0), CurValue(0), CurCodeSize(2) {}
~BitstreamWriter() {
assert(CurBit == 0 && "Unflused data remaining");
assert(BlockScope.empty() && CurAbbrevs.empty() && "Block imbalance");
// Free the BlockInfoRecords.
while (!BlockInfoRecords.empty()) {
BlockInfo &Info = BlockInfoRecords.back();
@@ -82,7 +82,7 @@ public:
//===--------------------------------------------------------------------===//
// Basic Primitives for emitting bits to the stream.
//===--------------------------------------------------------------------===//
void Emit(uint32_t Val, unsigned NumBits) {
assert(NumBits <= 32 && "Invalid value size!");
assert((Val & ~(~0U >> (32-NumBits))) == 0 && "High bits set!");
@@ -91,21 +91,21 @@ public:
CurBit += NumBits;
return;
}
// Add the current word.
unsigned V = CurValue;
Out.push_back((unsigned char)(V >> 0));
Out.push_back((unsigned char)(V >> 8));
Out.push_back((unsigned char)(V >> 16));
Out.push_back((unsigned char)(V >> 24));
if (CurBit)
CurValue = Val >> (32-CurBit);
else
CurValue = 0;
CurBit = (CurBit+NumBits) & 31;
}
void Emit64(uint64_t Val, unsigned NumBits) {
if (NumBits <= 32)
Emit((uint32_t)Val, NumBits);
@@ -114,7 +114,7 @@ public:
Emit((uint32_t)(Val >> 32), NumBits-32);
}
}
void FlushToWord() {
if (CurBit) {
unsigned V = CurValue;
@@ -126,40 +126,40 @@ public:
CurValue = 0;
}
}
void EmitVBR(uint32_t Val, unsigned NumBits) {
uint32_t Threshold = 1U << (NumBits-1);
// Emit the bits with VBR encoding, NumBits-1 bits at a time.
while (Val >= Threshold) {
Emit((Val & ((1 << (NumBits-1))-1)) | (1 << (NumBits-1)), NumBits);
Val >>= NumBits-1;
}
Emit(Val, NumBits);
}
void EmitVBR64(uint64_t Val, unsigned NumBits) {
if ((uint32_t)Val == Val)
return EmitVBR((uint32_t)Val, NumBits);
uint64_t Threshold = 1U << (NumBits-1);
// Emit the bits with VBR encoding, NumBits-1 bits at a time.
while (Val >= Threshold) {
Emit(((uint32_t)Val & ((1 << (NumBits-1))-1)) |
(1 << (NumBits-1)), NumBits);
Val >>= NumBits-1;
}
Emit((uint32_t)Val, NumBits);
}
/// EmitCode - Emit the specified code.
void EmitCode(unsigned Val) {
Emit(Val, CurCodeSize);
}
// BackpatchWord - Backpatch a 32-bit word in the output with the specified
// value.
void BackpatchWord(unsigned ByteNo, unsigned NewWord) {
@@ -168,25 +168,25 @@ public:
Out[ByteNo++] = (unsigned char)(NewWord >> 16);
Out[ByteNo ] = (unsigned char)(NewWord >> 24);
}
//===--------------------------------------------------------------------===//
// Block Manipulation
//===--------------------------------------------------------------------===//
/// getBlockInfo - If there is block info for the specified ID, return it,
/// otherwise return null.
BlockInfo *getBlockInfo(unsigned BlockID) {
// Common case, the most recent entry matches BlockID.
if (!BlockInfoRecords.empty() && BlockInfoRecords.back().BlockID == BlockID)
return &BlockInfoRecords.back();
for (unsigned i = 0, e = static_cast<unsigned>(BlockInfoRecords.size());
i != e; ++i)
if (BlockInfoRecords[i].BlockID == BlockID)
return &BlockInfoRecords[i];
return 0;
}
void EnterSubblock(unsigned BlockID, unsigned CodeLen) {
// Block header:
// [ENTER_SUBBLOCK, blockid, newcodelen, <align4bytes>, blocklen]
@@ -194,15 +194,15 @@ public:
EmitVBR(BlockID, bitc::BlockIDWidth);
EmitVBR(CodeLen, bitc::CodeLenWidth);
FlushToWord();
unsigned BlockSizeWordLoc = static_cast<unsigned>(Out.size());
unsigned OldCodeSize = CurCodeSize;
// Emit a placeholder, which will be replaced when the block is popped.
Emit(0, bitc::BlockSizeWidth);
CurCodeSize = CodeLen;
// Push the outer block's abbrev set onto the stack, start out with an
// empty abbrev set.
BlockScope.push_back(Block(OldCodeSize, BlockSizeWordLoc/4));
@@ -218,17 +218,17 @@ public:
}
}
}
void ExitBlock() {
assert(!BlockScope.empty() && "Block scope imbalance!");
// Delete all abbrevs.
for (unsigned i = 0, e = static_cast<unsigned>(CurAbbrevs.size());
i != e; ++i)
CurAbbrevs[i]->dropRef();
const Block &B = BlockScope.back();
// Block tail:
// [END_BLOCK, <align4bytes>]
EmitCode(bitc::END_BLOCK);
@@ -237,20 +237,20 @@ public:
// Compute the size of the block, in words, not counting the size field.
unsigned SizeInWords= static_cast<unsigned>(Out.size())/4-B.StartSizeWord-1;
unsigned ByteNo = B.StartSizeWord*4;
// Update the block size field in the header of this sub-block.
BackpatchWord(ByteNo, SizeInWords);
// Restore the inner block's code size and abbrev table.
CurCodeSize = B.PrevCodeSize;
BlockScope.back().PrevAbbrevs.swap(CurAbbrevs);
BlockScope.pop_back();
}
//===--------------------------------------------------------------------===//
// Record Emission
//===--------------------------------------------------------------------===//
private:
/// EmitAbbreviatedField - Emit a single scalar field value with the specified
/// encoding.
@@ -263,7 +263,7 @@ private:
"Invalid abbrev for record!");
return;
}
// Encode the value as we are commanded.
switch (Op.getEncoding()) {
default: assert(0 && "Unknown encoding!");
@@ -276,10 +276,10 @@ private:
case BitCodeAbbrevOp::Char6:
Emit(BitCodeAbbrevOp::EncodeChar6((char)V), 6);
break;
}
}
}
public:
/// EmitRecord - Emit the specified record to the stream, using an abbrev if
/// we have one to compress the output.
template<typename uintty>
@@ -289,12 +289,12 @@ public:
unsigned AbbrevNo = Abbrev-bitc::FIRST_APPLICATION_ABBREV;
assert(AbbrevNo < CurAbbrevs.size() && "Invalid abbrev #!");
BitCodeAbbrev *Abbv = CurAbbrevs[AbbrevNo];
EmitCode(Abbrev);
// Insert the code into Vals to treat it uniformly.
Vals.insert(Vals.begin(), Code);
unsigned RecordIdx = 0;
for (unsigned i = 0, e = static_cast<unsigned>(Abbv->getNumOperandInfos());
i != e; ++i) {
@@ -307,10 +307,10 @@ public:
// Array case.
assert(i+2 == e && "array op not second to last?");
const BitCodeAbbrevOp &EltEnc = Abbv->getOperandInfo(++i);
// Emit a vbr6 to indicate the number of elements present.
EmitVBR(static_cast<uint32_t>(Vals.size()-RecordIdx), 6);
// Emit each field.
for (; RecordIdx != Vals.size(); ++RecordIdx)
EmitAbbreviatedField(EltEnc, Vals[RecordIdx]);
@@ -331,7 +331,7 @@ public:
//===--------------------------------------------------------------------===//
// Abbrev Emission
//===--------------------------------------------------------------------===//
private:
// Emit the abbreviation as a DEFINE_ABBREV record.
void EncodeAbbrev(BitCodeAbbrev *Abbv) {
@@ -351,7 +351,7 @@ private:
}
}
public:
/// EmitAbbrev - This emits an abbreviation to the stream. Note that this
/// method takes ownership of the specified abbrev.
unsigned EmitAbbrev(BitCodeAbbrev *Abbv) {
@@ -361,17 +361,17 @@ public:
return static_cast<unsigned>(CurAbbrevs.size())-1 +
bitc::FIRST_APPLICATION_ABBREV;
}
//===--------------------------------------------------------------------===//
// BlockInfo Block Emission
//===--------------------------------------------------------------------===//
/// EnterBlockInfoBlock - Start emitting the BLOCKINFO_BLOCK.
void EnterBlockInfoBlock(unsigned CodeWidth) {
EnterSubblock(bitc::BLOCKINFO_BLOCK_ID, CodeWidth);
BlockInfoCurBID = -1U;
}
private:
private:
/// SwitchToBlockID - If we aren't already talking about the specified block
/// ID, emit a BLOCKINFO_CODE_SETBID record.
void SwitchToBlockID(unsigned BlockID) {
@@ -385,25 +385,25 @@ private:
BlockInfo &getOrCreateBlockInfo(unsigned BlockID) {
if (BlockInfo *BI = getBlockInfo(BlockID))
return *BI;
// Otherwise, add a new record.
BlockInfoRecords.push_back(BlockInfo());
BlockInfoRecords.back().BlockID = BlockID;
return BlockInfoRecords.back();
}
public:
/// EmitBlockInfoAbbrev - Emit a DEFINE_ABBREV record for the specified
/// BlockID.
unsigned EmitBlockInfoAbbrev(unsigned BlockID, BitCodeAbbrev *Abbv) {
SwitchToBlockID(BlockID);
EncodeAbbrev(Abbv);
// Add the abbrev to the specified block record.
BlockInfo &Info = getOrCreateBlockInfo(BlockID);
Info.Abbrevs.push_back(Abbv);
return Info.Abbrevs.size()-1+bitc::FIRST_APPLICATION_ABBREV;
}
};