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Fixed : strict aliasing warnings in legacy decoders

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This commit is contained in:
Yann Collet 2016-01-06 12:35:42 +01:00
parent 218bd31942
commit 1fdd82312d
4 changed files with 90 additions and 53 deletions
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39
lib/legacy/zstd_v01.c
View File

@ -418,8 +418,9 @@ typedef struct {
static size_t FSE_FUNCTION_NAME(FSE_buildDTable, FSE_FUNCTION_EXTENSION)
(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog)
{
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)dt;
FSE_DECODE_TYPE* const tableDecode = (FSE_DECODE_TYPE*) (dt+1); /* because dt is unsigned, 32-bits aligned on 32-bits */
void* ptr = dt;
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr;
FSE_DECODE_TYPE* const tableDecode = (FSE_DECODE_TYPE*)(ptr) + 1; /* because dt is unsigned, 32-bits aligned on 32-bits */
const U32 tableSize = 1 << tableLog;
const U32 tableMask = tableSize-1;
const U32 step = FSE_tableStep(tableSize);
@ -615,8 +616,9 @@ static size_t FSE_readNCount (short* normalizedCounter, unsigned* maxSVPtr, unsi
*********************************************************/
static size_t FSE_buildDTable_rle (FSE_DTable* dt, BYTE symbolValue)
{
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)dt;
FSE_decode_t* const cell = (FSE_decode_t*)(dt + 1); /* because dt is unsigned */
void* ptr = dt;
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr;
FSE_decode_t* const cell = (FSE_decode_t*)(ptr) + 1; /* because dt is unsigned */
DTableH->tableLog = 0;
DTableH->fastMode = 0;
@ -631,8 +633,9 @@ static size_t FSE_buildDTable_rle (FSE_DTable* dt, BYTE symbolValue)
static size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits)
{
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)dt;
FSE_decode_t* const dinfo = (FSE_decode_t*)(dt + 1); /* because dt is unsigned */
void* ptr = dt;
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr;
FSE_decode_t* const dinfo = (FSE_decode_t*)(ptr) + 1; /* because dt is unsigned */
const unsigned tableSize = 1 << nbBits;
const unsigned tableMask = tableSize - 1;
const unsigned maxSymbolValue = tableMask;
@ -701,7 +704,7 @@ static size_t FSE_initDStream(FSE_DStream_t* bitD, const void* srcBuffer, size_t
}
/* FSE_lookBits
/*!FSE_lookBits
* Provides next n bits from the bitContainer.
* bitContainer is not modified (bits are still present for next read/look)
* On 32-bits, maxNbBits==25
@ -726,7 +729,7 @@ static void FSE_skipBits(FSE_DStream_t* bitD, U32 nbBits)
}
/* FSE_readBits
/*!FSE_readBits
* Read next n bits from the bitContainer.
* On 32-bits, don't read more than maxNbBits==25
* On 64-bits, don't read more than maxNbBits==57
@ -782,7 +785,8 @@ static unsigned FSE_reloadDStream(FSE_DStream_t* bitD)
static void FSE_initDState(FSE_DState_t* DStatePtr, FSE_DStream_t* bitD, const FSE_DTable* dt)
{
const FSE_DTableHeader* const DTableH = (const FSE_DTableHeader*)dt;
const void* ptr = dt;
const FSE_DTableHeader* const DTableH = (const FSE_DTableHeader*)ptr;
DStatePtr->state = FSE_readBits(bitD, DTableH->tableLog);
FSE_reloadDStream(bitD);
DStatePtr->table = dt + 1;
@ -898,7 +902,8 @@ static size_t FSE_decompress_usingDTable(void* dst, size_t originalSize,
const void* cSrc, size_t cSrcSize,
const FSE_DTable* dt)
{
const FSE_DTableHeader* DTableH = (const FSE_DTableHeader*)dt;
const void* ptr = dt;
const FSE_DTableHeader* DTableH = (const FSE_DTableHeader*)ptr;
const U32 fastMode = DTableH->fastMode;
/* select fast mode (static) */
@ -935,7 +940,7 @@ static size_t FSE_decompress(void* dst, size_t maxDstSize, const void* cSrc, siz
/*********************************************************
/* *******************************************************
* Huff0 : Huffman block compression
*********************************************************/
#define HUF_MAX_SYMBOL_VALUE 255
@ -959,7 +964,7 @@ typedef struct nodeElt_s {
} nodeElt;
/*********************************************************
/* *******************************************************
* Huff0 : Huffman block decompression
*********************************************************/
typedef struct {
@ -978,7 +983,8 @@ static size_t HUF_readDTable (U16* DTable, const void* src, size_t srcSize)
size_t oSize;
U32 n;
U32 nextRankStart;
HUF_DElt* const dt = (HUF_DElt*)(DTable + 1);
void* ptr = DTable+1;
HUF_DElt* const dt = (HUF_DElt*)ptr;
FSE_STATIC_ASSERT(sizeof(HUF_DElt) == sizeof(U16)); /* if compilation fails here, assertion is false */
//memset(huffWeight, 0, sizeof(huffWeight)); /* should not be necessary, but some analyzer complain ... */
@ -1082,7 +1088,8 @@ static size_t HUF_decompress_usingDTable( /* -3% slower when non static */
BYTE* const omax = op + maxDstSize;
BYTE* const olimit = omax-15;
const HUF_DElt* const dt = (const HUF_DElt*)(DTable+1);
const void* ptr = DTable;
const HUF_DElt* const dt = (const HUF_DElt*)(ptr)+1;
const U32 dtLog = DTable[0];
size_t errorCode;
U32 reloadStatus;
@ -1988,8 +1995,8 @@ static size_t ZSTD_decompressBlock(
{
/* blockType == blockCompressed, srcSize is trusted */
const BYTE* ip = (const BYTE*)src;
const BYTE* litPtr;
size_t litSize;
const BYTE* litPtr = NULL;
size_t litSize = 0;
size_t errorCode;
/* Decode literals sub-block */

51
lib/legacy/zstd_v02.c
View File

@ -891,7 +891,8 @@ typedef struct
MEM_STATIC void FSE_initDState(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD, const FSE_DTable* dt)
{
const FSE_DTableHeader* const DTableH = (const FSE_DTableHeader*)dt;
const void* ptr = dt;
const FSE_DTableHeader* const DTableH = (const FSE_DTableHeader*)ptr;
DStatePtr->state = BIT_readBits(bitD, DTableH->tableLog);
BIT_reloadDStream(bitD);
DStatePtr->table = dt + 1;
@ -1272,8 +1273,9 @@ static U32 FSE_tableStep(U32 tableSize) { return (tableSize>>1) + (tableSize>>3)
static size_t FSE_FUNCTION_NAME(FSE_buildDTable, FSE_FUNCTION_EXTENSION)
(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog)
{
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)dt;
FSE_DECODE_TYPE* const tableDecode = (FSE_DECODE_TYPE*) (dt+1); /* because dt is unsigned, 32-bits aligned on 32-bits */
void* ptr = dt;
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr;
FSE_DECODE_TYPE* const tableDecode = (FSE_DECODE_TYPE*)(ptr) + 1;
const U32 tableSize = 1 << tableLog;
const U32 tableMask = tableSize-1;
const U32 step = FSE_tableStep(tableSize);
@ -1468,8 +1470,9 @@ static size_t FSE_readNCount (short* normalizedCounter, unsigned* maxSVPtr, unsi
*********************************************************/
static size_t FSE_buildDTable_rle (FSE_DTable* dt, BYTE symbolValue)
{
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)dt;
FSE_decode_t* const cell = (FSE_decode_t*)(dt + 1); /* because dt is unsigned */
void* ptr = dt;
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr;
FSE_decode_t* const cell = (FSE_decode_t*)(ptr) + 1; /* because dt is unsigned */
DTableH->tableLog = 0;
DTableH->fastMode = 0;
@ -1484,8 +1487,9 @@ static size_t FSE_buildDTable_rle (FSE_DTable* dt, BYTE symbolValue)
static size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits)
{
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)dt;
FSE_decode_t* const dinfo = (FSE_decode_t*)(dt + 1); /* because dt is unsigned */
void* ptr = dt;
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr;
FSE_decode_t* const dinfo = (FSE_decode_t*)(ptr) + 1; /* because dt is unsigned */
const unsigned tableSize = 1 << nbBits;
const unsigned tableMask = tableSize - 1;
const unsigned maxSymbolValue = tableMask;
@ -1581,7 +1585,8 @@ static size_t FSE_decompress_usingDTable(void* dst, size_t originalSize,
const void* cSrc, size_t cSrcSize,
const FSE_DTable* dt)
{
const FSE_DTableHeader* DTableH = (const FSE_DTableHeader*)dt;
const void* ptr = dt;
const FSE_DTableHeader* DTableH = (const FSE_DTableHeader*)ptr;
const U32 fastMode = DTableH->fastMode;
/* select fast mode (static) */
@ -1810,7 +1815,8 @@ static size_t HUF_readDTableX2 (U16* DTable, const void* src, size_t srcSize)
U32 nbSymbols = 0;
U32 n;
U32 nextRankStart;
HUF_DEltX2* const dt = (HUF_DEltX2*)(DTable + 1);
void* ptr = DTable+1;
HUF_DEltX2* const dt = (HUF_DEltX2*)ptr;
HUF_STATIC_ASSERT(sizeof(HUF_DEltX2) == sizeof(U16)); /* if compilation fails here, assertion is false */
//memset(huffWeight, 0, sizeof(huffWeight)); /* is not necessary, even though some analyzer complain ... */
@ -1903,7 +1909,8 @@ static size_t HUF_decompress4X2_usingDTable(
BYTE* const ostart = (BYTE*) dst;
BYTE* const oend = ostart + dstSize;
const HUF_DEltX2* const dt = ((const HUF_DEltX2*)DTable) +1;
const void* ptr = DTable;
const HUF_DEltX2* const dt = ((const HUF_DEltX2*)ptr) +1;
const U32 dtLog = DTable[0];
size_t errorCode;
@ -2112,7 +2119,8 @@ static size_t HUF_readDTableX4 (U32* DTable, const void* src, size_t srcSize)
const U32 memLog = DTable[0];
const BYTE* ip = (const BYTE*) src;
size_t iSize = ip[0];
HUF_DEltX4* const dt = ((HUF_DEltX4*)DTable) + 1;
void* ptr = DTable;
HUF_DEltX4* const dt = ((HUF_DEltX4*)ptr) + 1;
HUF_STATIC_ASSERT(sizeof(HUF_DEltX4) == sizeof(U32)); /* if compilation fails here, assertion is false */
if (memLog > HUF_ABSOLUTEMAX_TABLELOG) return ERROR(tableLog_tooLarge);
@ -2262,7 +2270,8 @@ static size_t HUF_decompress4X4_usingDTable(
BYTE* const ostart = (BYTE*) dst;
BYTE* const oend = ostart + dstSize;
const HUF_DEltX4* const dt = ((const HUF_DEltX4*)DTable) +1;
const void* ptr = DTable;
const HUF_DEltX4* const dt = ((const HUF_DEltX4*)ptr) +1;
const U32 dtLog = DTable[0];
size_t errorCode;
@ -2510,8 +2519,10 @@ static size_t HUF_readDTableX6 (U32* DTable, const void* src, size_t srcSize)
/* fill tables */
{
HUF_DDescX6* DDescription = (HUF_DDescX6*)(DTable+1);
HUF_DSeqX6* DSequence = (HUF_DSeqX6*)(DTable + 1 + ((size_t)1<<(memLog-1)));
void* ptr = DTable+1;
HUF_DDescX6* DDescription = (HUF_DDescX6*)(ptr);
void* dSeqStart = DTable + 1 + ((size_t)1<<(memLog-1));
HUF_DSeqX6* DSequence = (HUF_DSeqX6*)(dSeqStart);
HUF_DSeqX6 DSeq;
HUF_DDescX6 DDesc;
DSeq.sequence = 0;
@ -2570,8 +2581,10 @@ static U32 HUF_decodeLastSymbolsX6(void* op, const U32 maxL, BIT_DStream_t* DStr
static inline size_t HUF_decodeStreamX6(BYTE* p, BIT_DStream_t* bitDPtr, BYTE* const pEnd, const U32* DTable, const U32 dtLog)
{
const HUF_DDescX6* dd = (const HUF_DDescX6*)(DTable+1);
const HUF_DSeqX6* ds = (const HUF_DSeqX6*)(DTable + 1 + ((size_t)1<<(dtLog-1)));
const void* ddPtr = DTable+1;
const HUF_DDescX6* dd = (const HUF_DDescX6*)(ddPtr);
const void* dsPtr = DTable + 1 + ((size_t)1<<(dtLog-1));
const HUF_DSeqX6* ds = (const HUF_DSeqX6*)(dsPtr);
BYTE* const pStart = p;
/* up to 16 symbols at a time */
@ -2611,8 +2624,10 @@ static size_t HUF_decompress4X6_usingDTable(
BYTE* const oend = ostart + dstSize;
const U32 dtLog = DTable[0];
const HUF_DDescX6* dd = (const HUF_DDescX6*)(DTable+1);
const HUF_DSeqX6* ds = (const HUF_DSeqX6*)(DTable + 1 + ((size_t)1<<(dtLog-1)));
const void* ddPtr = DTable+1;
const HUF_DDescX6* dd = (const HUF_DDescX6*)(ddPtr);
const void* dsPtr = DTable + 1 + ((size_t)1<<(dtLog-1));
const HUF_DSeqX6* ds = (const HUF_DSeqX6*)(dsPtr);
size_t errorCode;
/* Init */

51
lib/legacy/zstd_v03.c
View File

@ -891,7 +891,8 @@ typedef struct
MEM_STATIC void FSE_initDState(FSE_DState_t* DStatePtr, BIT_DStream_t* bitD, const FSE_DTable* dt)
{
const FSE_DTableHeader* const DTableH = (const FSE_DTableHeader*)dt;
const void* ptr = dt;
const FSE_DTableHeader* const DTableH = (const FSE_DTableHeader*)ptr;
DStatePtr->state = BIT_readBits(bitD, DTableH->tableLog);
BIT_reloadDStream(bitD);
DStatePtr->table = dt + 1;
@ -1272,8 +1273,9 @@ static U32 FSE_tableStep(U32 tableSize) { return (tableSize>>1) + (tableSize>>3)
static size_t FSE_FUNCTION_NAME(FSE_buildDTable, FSE_FUNCTION_EXTENSION)
(FSE_DTable* dt, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog)
{
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)dt;
FSE_DECODE_TYPE* const tableDecode = (FSE_DECODE_TYPE*) (dt+1); /* because dt is unsigned, 32-bits aligned on 32-bits */
void* ptr = dt;
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr;
FSE_DECODE_TYPE* const tableDecode = (FSE_DECODE_TYPE*)(ptr) + 1; /* because dt is unsigned, 32-bits aligned on 32-bits */
const U32 tableSize = 1 << tableLog;
const U32 tableMask = tableSize-1;
const U32 step = FSE_tableStep(tableSize);
@ -1468,8 +1470,9 @@ static size_t FSE_readNCount (short* normalizedCounter, unsigned* maxSVPtr, unsi
*********************************************************/
static size_t FSE_buildDTable_rle (FSE_DTable* dt, BYTE symbolValue)
{
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)dt;
FSE_decode_t* const cell = (FSE_decode_t*)(dt + 1); /* because dt is unsigned */
void* ptr = dt;
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr;
FSE_decode_t* const cell = (FSE_decode_t*)(ptr) + 1;
DTableH->tableLog = 0;
DTableH->fastMode = 0;
@ -1484,8 +1487,9 @@ static size_t FSE_buildDTable_rle (FSE_DTable* dt, BYTE symbolValue)
static size_t FSE_buildDTable_raw (FSE_DTable* dt, unsigned nbBits)
{
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)dt;
FSE_decode_t* const dinfo = (FSE_decode_t*)(dt + 1); /* because dt is unsigned */
void* ptr = dt;
FSE_DTableHeader* const DTableH = (FSE_DTableHeader*)ptr;
FSE_decode_t* const dinfo = (FSE_decode_t*)(ptr) + 1;
const unsigned tableSize = 1 << nbBits;
const unsigned tableMask = tableSize - 1;
const unsigned maxSymbolValue = tableMask;
@ -1581,7 +1585,8 @@ static size_t FSE_decompress_usingDTable(void* dst, size_t originalSize,
const void* cSrc, size_t cSrcSize,
const FSE_DTable* dt)
{
const FSE_DTableHeader* DTableH = (const FSE_DTableHeader*)dt;
const void* ptr = dt;
const FSE_DTableHeader* DTableH = (const FSE_DTableHeader*)ptr;
const U32 fastMode = DTableH->fastMode;
/* select fast mode (static) */
@ -1810,7 +1815,8 @@ static size_t HUF_readDTableX2 (U16* DTable, const void* src, size_t srcSize)
U32 nbSymbols = 0;
U32 n;
U32 nextRankStart;
HUF_DEltX2* const dt = (HUF_DEltX2*)(DTable + 1);
void* ptr = DTable+1;
HUF_DEltX2* const dt = (HUF_DEltX2*)(ptr);
HUF_STATIC_ASSERT(sizeof(HUF_DEltX2) == sizeof(U16)); /* if compilation fails here, assertion is false */
//memset(huffWeight, 0, sizeof(huffWeight)); /* is not necessary, even though some analyzer complain ... */
@ -1903,7 +1909,8 @@ static size_t HUF_decompress4X2_usingDTable(
BYTE* const ostart = (BYTE*) dst;
BYTE* const oend = ostart + dstSize;
const HUF_DEltX2* const dt = ((const HUF_DEltX2*)DTable) +1;
const void* ptr = DTable;
const HUF_DEltX2* const dt = ((const HUF_DEltX2*)ptr) +1;
const U32 dtLog = DTable[0];
size_t errorCode;
@ -2112,7 +2119,8 @@ static size_t HUF_readDTableX4 (U32* DTable, const void* src, size_t srcSize)
const U32 memLog = DTable[0];
const BYTE* ip = (const BYTE*) src;
size_t iSize = ip[0];
HUF_DEltX4* const dt = ((HUF_DEltX4*)DTable) + 1;
void* ptr = DTable;
HUF_DEltX4* const dt = ((HUF_DEltX4*)ptr) + 1;
HUF_STATIC_ASSERT(sizeof(HUF_DEltX4) == sizeof(U32)); /* if compilation fails here, assertion is false */
if (memLog > HUF_ABSOLUTEMAX_TABLELOG) return ERROR(tableLog_tooLarge);
@ -2262,7 +2270,8 @@ static size_t HUF_decompress4X4_usingDTable(
BYTE* const ostart = (BYTE*) dst;
BYTE* const oend = ostart + dstSize;
const HUF_DEltX4* const dt = ((const HUF_DEltX4*)DTable) +1;
const void* ptr = DTable;
const HUF_DEltX4* const dt = ((const HUF_DEltX4*)ptr) +1;
const U32 dtLog = DTable[0];
size_t errorCode;
@ -2510,8 +2519,10 @@ static size_t HUF_readDTableX6 (U32* DTable, const void* src, size_t srcSize)
/* fill tables */
{
HUF_DDescX6* DDescription = (HUF_DDescX6*)(DTable+1);
HUF_DSeqX6* DSequence = (HUF_DSeqX6*)(DTable + 1 + ((size_t)1<<(memLog-1)));
void* ddPtr = DTable+1;
HUF_DDescX6* DDescription = (HUF_DDescX6*)(ddPtr);
void* dsPtr = DTable + 1 + ((size_t)1<<(memLog-1));
HUF_DSeqX6* DSequence = (HUF_DSeqX6*)(dsPtr);
HUF_DSeqX6 DSeq;
HUF_DDescX6 DDesc;
DSeq.sequence = 0;
@ -2570,8 +2581,10 @@ static U32 HUF_decodeLastSymbolsX6(void* op, const U32 maxL, BIT_DStream_t* DStr
static inline size_t HUF_decodeStreamX6(BYTE* p, BIT_DStream_t* bitDPtr, BYTE* const pEnd, const U32* DTable, const U32 dtLog)
{
const HUF_DDescX6* dd = (const HUF_DDescX6*)(DTable+1);
const HUF_DSeqX6* ds = (const HUF_DSeqX6*)(DTable + 1 + ((size_t)1<<(dtLog-1)));
const void* ddPtr = DTable+1;
const HUF_DDescX6* dd = (const HUF_DDescX6*)(ddPtr);
const void* dsPtr = DTable + 1 + ((size_t)1<<(dtLog-1));
const HUF_DSeqX6* ds = (const HUF_DSeqX6*)(dsPtr);
BYTE* const pStart = p;
/* up to 16 symbols at a time */
@ -2611,8 +2624,10 @@ static size_t HUF_decompress4X6_usingDTable(
BYTE* const oend = ostart + dstSize;
const U32 dtLog = DTable[0];
const HUF_DDescX6* dd = (const HUF_DDescX6*)(DTable+1);
const HUF_DSeqX6* ds = (const HUF_DSeqX6*)(DTable + 1 + ((size_t)1<<(dtLog-1)));
const void* ddPtr = DTable+1;
const HUF_DDescX6* dd = (const HUF_DDescX6*)(ddPtr);
const void* dsPtr = DTable + 1 + ((size_t)1<<(dtLog-1));
const HUF_DSeqX6* ds = (const HUF_DSeqX6*)(dsPtr);
size_t errorCode;
/* Init */

2
programs/Makefile
View File

@ -45,7 +45,7 @@ DESTDIR?=
PREFIX ?= /usr/local
CPPFLAGS= -I../lib -DZSTD_VERSION=\"$(VERSION)\"
CFLAGS ?= -O3 # -falign-loops=32 # not always beneficial
CFLAGS += -std=c99 -Wall -Wextra -Wundef -Wshadow -Wcast-qual -Wcast-align -Wstrict-prototypes
CFLAGS += -std=c99 -Wall -Wextra -Wundef -Wshadow -Wcast-qual -Wcast-align -Wstrict-prototypes -Wstrict-aliasing=1
FLAGS = $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) $(MOREFLAGS)
BINDIR = $(PREFIX)/bin