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Merge pull request #2415 from facebook/fix_aliasing

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fix gcc-10 strict aliasing warnings
This commit is contained in:
Yann Collet 2020-12-04 21:30:57 -08:00 committed by GitHub
commit b86e3c9304
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 28 additions and 25 deletions
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14
lib/common/entropy_common.c
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@ -261,11 +261,12 @@ size_t HUF_readStats(BYTE* huffWeight, size_t hwSize, U32* rankStats,
return HUF_readStats_wksp(huffWeight, hwSize, rankStats, nbSymbolsPtr, tableLogPtr, src, srcSize, wksp, sizeof(wksp), /* bmi2 */ 0);
}
FORCE_INLINE_TEMPLATE size_t HUF_readStats_body(BYTE* huffWeight, size_t hwSize, U32* rankStats,
U32* nbSymbolsPtr, U32* tableLogPtr,
const void* src, size_t srcSize,
void* workSpace, size_t wkspSize,
int bmi2)
FORCE_INLINE_TEMPLATE size_t
HUF_readStats_body(BYTE* huffWeight, size_t hwSize, U32* rankStats,
U32* nbSymbolsPtr, U32* tableLogPtr,
const void* src, size_t srcSize,
void* workSpace, size_t wkspSize,
int bmi2)
{
U32 weightTotal;
const BYTE* ip = (const BYTE*) src;
@ -289,7 +290,8 @@ FORCE_INLINE_TEMPLATE size_t HUF_readStats_body(BYTE* huffWeight, size_t hwSize,
} } }
else { /* header compressed with FSE (normal case) */
if (iSize+1 > srcSize) return ERROR(srcSize_wrong);
oSize = FSE_decompress_wksp_bmi2(huffWeight, hwSize-1, ip+1, iSize, 6, workSpace, wkspSize, bmi2); /* max (hwSize-1) values decoded, as last one is implied */
/* max (hwSize-1) values decoded, as last one is implied */
oSize = FSE_decompress_wksp_bmi2(huffWeight, hwSize-1, ip+1, iSize, 6, workSpace, wkspSize, bmi2);
if (FSE_isError(oSize)) return oSize;
}

11
lib/common/huf.h
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@ -135,12 +135,16 @@ HUF_PUBLIC_API size_t HUF_compress4X_wksp (void* dst, size_t dstCapacity,
#define HUF_COMPRESSBOUND(size) (HUF_CTABLEBOUND + HUF_BLOCKBOUND(size)) /* Macro version, useful for static allocation */
/* static allocation of HUF's Compression Table */
/* this is a private definition, just exposed for allocation and strict aliasing purpose. never EVER access its members directly */
struct HUF_CElt_s {
U16 val;
BYTE nbBits;
}; /* typedef'd to HUF_CElt */
typedef struct HUF_CElt_s HUF_CElt; /* consider it an incomplete type */
#define HUF_CTABLE_SIZE_U32(maxSymbolValue) ((maxSymbolValue)+1) /* Use tables of U32, for proper alignment */
#define HUF_CTABLE_SIZE(maxSymbolValue) (HUF_CTABLE_SIZE_U32(maxSymbolValue) * sizeof(U32))
#define HUF_CREATE_STATIC_CTABLE(name, maxSymbolValue) \
U32 name##hb[HUF_CTABLE_SIZE_U32(maxSymbolValue)]; \
void* name##hv = &(name##hb); \
HUF_CElt* name = (HUF_CElt*)(name##hv) /* no final ; */
HUF_CElt name[HUF_CTABLE_SIZE_U32(maxSymbolValue)] /* no final ; */
/* static allocation of HUF's DTable */
typedef U32 HUF_DTable;
@ -186,7 +190,6 @@ size_t HUF_decompress4X2_DCtx_wksp(HUF_DTable* dctx, void* dst, size_t dstSize,
* or to save and regenerate 'CTable' using external methods.
*/
unsigned HUF_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue);
typedef struct HUF_CElt_s HUF_CElt; /* incomplete type */
size_t HUF_buildCTable (HUF_CElt* CTable, const unsigned* count, unsigned maxSymbolValue, unsigned maxNbBits); /* @return : maxNbBits; CTable and count can overlap. In which case, CTable will overwrite count content */
size_t HUF_writeCTable (void* dst, size_t maxDstSize, const HUF_CElt* CTable, unsigned maxSymbolValue, unsigned huffLog);
size_t HUF_compress4X_usingCTable(void* dst, size_t dstSize, const void* src, size_t srcSize, const HUF_CElt* CTable);

8
lib/compress/huf_compress.c
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@ -102,11 +102,6 @@ static size_t HUF_compressWeights (void* dst, size_t dstSize, const void* weight
}
struct HUF_CElt_s {
U16 val;
BYTE nbBits;
}; /* typedef'd to HUF_CElt within "huf.h" */
/*! HUF_writeCTable() :
`CTable` : Huffman tree to save, using huf representation.
@return : size of saved CTable */
@ -155,6 +150,7 @@ size_t HUF_readCTable (HUF_CElt* CTable, unsigned* maxSymbolValuePtr, const void
/* get symbol weights */
CHECK_V_F(readSize, HUF_readStats(huffWeight, HUF_SYMBOLVALUE_MAX+1, rankVal, &nbSymbols, &tableLog, src, srcSize));
*hasZeroWeights = (rankVal[0] > 0);
/* check result */
if (tableLog > HUF_TABLELOG_MAX) return ERROR(tableLog_tooLarge);
@ -169,10 +165,8 @@ size_t HUF_readCTable (HUF_CElt* CTable, unsigned* maxSymbolValuePtr, const void
} }
/* fill nbBits */
*hasZeroWeights = 0;
{ U32 n; for (n=0; n<nbSymbols; n++) {
const U32 w = huffWeight[n];
*hasZeroWeights |= (w == 0);
CTable[n].nbBits = (BYTE)(tableLog + 1 - w) & -(w != 0);
} }

2
lib/compress/zstd_compress_internal.h
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@ -63,7 +63,7 @@ typedef struct {
} ZSTD_localDict;
typedef struct {
U32 CTable[HUF_CTABLE_SIZE_U32(255)];
HUF_CElt CTable[HUF_CTABLE_SIZE_U32(255)];
HUF_repeat repeatMode;
} ZSTD_hufCTables_t;

8
tests/decodecorpus.c
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@ -199,7 +199,7 @@ typedef struct {
int hufInit;
/* the distribution used in the previous block for repeat mode */
BYTE hufDist[DISTSIZE];
U32 hufTable [256]; /* HUF_CElt is an incomplete type */
HUF_CElt hufTable [256];
int fseInit;
FSE_CTable offcodeCTable [FSE_CTABLE_SIZE_U32(OffFSELog, MaxOff)];
@ -535,7 +535,7 @@ static size_t writeLiteralsBlockCompressed(U32* seed, frame_t* frame, size_t con
* actual data to avoid bugs with symbols that were in the
* distribution but never showed up in the output */
hufHeaderSize = writeHufHeader(
seed, (HUF_CElt*)frame->stats.hufTable, op, opend - op,
seed, frame->stats.hufTable, op, opend - op,
frame->stats.hufDist, DISTSIZE);
CHECKERR(hufHeaderSize);
/* repeat until a valid header is written */
@ -558,10 +558,10 @@ static size_t writeLiteralsBlockCompressed(U32* seed, frame_t* frame, size_t con
sizeFormat == 0
? HUF_compress1X_usingCTable(
op, opend - op, LITERAL_BUFFER, litSize,
(HUF_CElt*)frame->stats.hufTable)
frame->stats.hufTable)
: HUF_compress4X_usingCTable(
op, opend - op, LITERAL_BUFFER, litSize,
(HUF_CElt*)frame->stats.hufTable);
frame->stats.hufTable);
CHECKERR(compressedSize);
/* this only occurs when it could not compress or similar */
} while (compressedSize <= 0);

10
zlibWrapper/zstd_zlibwrapper.c
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@ -182,7 +182,7 @@ static ZWRAP_CCtx* ZWRAP_createCCtx(z_streamp strm)
{
ZWRAP_CCtx* zwc;
ZSTD_customMem customMem = { NULL, NULL, NULL };
if (strm->zalloc && strm->zfree) {
customMem.customAlloc = ZWRAP_allocFunction;
customMem.customFree = ZWRAP_freeFunction;
@ -246,6 +246,10 @@ int ZWRAP_setPledgedSrcSize(z_streamp strm, unsigned long long pledgedSrcSize)
return Z_OK;
}
static struct internal_state* convert_into_sis(void* ptr)
{
return (struct internal_state*) ptr;
}
ZEXTERN int ZEXPORT z_deflateInit_ OF((z_streamp strm, int level,
const char *version, int stream_size))
@ -266,7 +270,7 @@ ZEXTERN int ZEXPORT z_deflateInit_ OF((z_streamp strm, int level,
zwc->streamEnd = 0;
zwc->totalInBytes = 0;
zwc->compressionLevel = level;
strm->state = (struct internal_state*) zwc; /* use state which in not used by user */
strm->state = convert_into_sis(zwc); /* use state which in not used by user */
strm->total_in = 0;
strm->total_out = 0;
strm->adler = 0;
@ -593,7 +597,7 @@ ZEXTERN int ZEXPORT z_inflateInit_ OF((z_streamp strm,
zwd->stream_size = stream_size;
zwd->totalInBytes = 0;
strm->state = (struct internal_state*) zwd;
strm->state = convert_into_sis(zwd);
strm->total_in = 0;
strm->total_out = 0;
strm->reserved = ZWRAP_UNKNOWN_STREAM;