ddidderr/zstd-rs
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[lib] Make lib compatible with -Wfall-through excepting legacy

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Switch to a macro `ZSTD_FALLTHROUGH;` instead of a comment. On supported
compilers this uses an attribute, otherwise it becomes a comment.

This is necessary to be compatible with clang's `-Wfall-through`, and
gcc's `-Wfall-through=2` which don't support comments. Without this the
linux build emits a bunch of warnings.
This commit is contained in:
Nick Terrell
2021-09-23 11:54:14 -07:00
parent 1715601e55
commit 20821a46f4
10 changed files with 79 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/decompress/zstd_decompress.c
+13 -6
View File
@@ -466,7 +466,9 @@ size_t ZSTD_getFrameHeader_advanced(ZSTD_frameHeader* zfhPtr, const void* src, s
}
switch(dictIDSizeCode)
{
default: assert(0); /* impossible */
default:
assert(0); /* impossible */
ZSTD_FALLTHROUGH;
case 0 : break;
case 1 : dictID = ip[pos]; pos++; break;
case 2 : dictID = MEM_readLE16(ip+pos); pos+=2; break;
@@ -474,7 +476,9 @@ size_t ZSTD_getFrameHeader_advanced(ZSTD_frameHeader* zfhPtr, const void* src, s
}
switch(fcsID)
{
default: assert(0); /* impossible */
default:
assert(0); /* impossible */
ZSTD_FALLTHROUGH;
case 0 : if (singleSegment) frameContentSize = ip[pos]; break;
case 1 : frameContentSize = MEM_readLE16(ip+pos)+256; break;
case 2 : frameContentSize = MEM_readLE32(ip+pos); break;
@@ -1009,7 +1013,7 @@ static ZSTD_DDict const* ZSTD_getDDict(ZSTD_DCtx* dctx)
switch (dctx->dictUses) {
default:
assert(0 /* Impossible */);
/* fall-through */
ZSTD_FALLTHROUGH;
case ZSTD_dont_use:
ZSTD_clearDict(dctx);
return NULL;
@@ -1073,7 +1077,9 @@ ZSTD_nextInputType_e ZSTD_nextInputType(ZSTD_DCtx* dctx) {
{
default: /* should not happen */
assert(0);
ZSTD_FALLTHROUGH;
case ZSTDds_getFrameHeaderSize:
ZSTD_FALLTHROUGH;
case ZSTDds_decodeFrameHeader:
return ZSTDnit_frameHeader;
case ZSTDds_decodeBlockHeader:
@@ -1085,6 +1091,7 @@ ZSTD_nextInputType_e ZSTD_nextInputType(ZSTD_DCtx* dctx) {
case ZSTDds_checkChecksum:
return ZSTDnit_checksum;
case ZSTDds_decodeSkippableHeader:
ZSTD_FALLTHROUGH;
case ZSTDds_skipFrame:
return ZSTDnit_skippableFrame;
}
@@ -1900,7 +1907,7 @@ size_t ZSTD_decompressStream(ZSTD_DStream* zds, ZSTD_outBuffer* output, ZSTD_inB
zds->legacyVersion = 0;
zds->hostageByte = 0;
zds->expectedOutBuffer = *output;
/* fall-through */
ZSTD_FALLTHROUGH;
case zdss_loadHeader :
DEBUGLOG(5, "stage zdss_loadHeader (srcSize : %u)", (U32)(iend - ip));
@@ -2038,7 +2045,7 @@ size_t ZSTD_decompressStream(ZSTD_DStream* zds, ZSTD_outBuffer* output, ZSTD_inB
zds->outBuffSize = neededOutBuffSize;
} } }
zds->streamStage = zdss_read;
/* fall-through */
ZSTD_FALLTHROUGH;
case zdss_read:
DEBUGLOG(5, "stage zdss_read");
@@ -2057,7 +2064,7 @@ size_t ZSTD_decompressStream(ZSTD_DStream* zds, ZSTD_outBuffer* output, ZSTD_inB
} }
if (ip==iend) { someMoreWork = 0; break; } /* no more input */
zds->streamStage = zdss_load;
/* fall-through */
ZSTD_FALLTHROUGH;
case zdss_load:
{ size_t const neededInSize = ZSTD_nextSrcSizeToDecompress(zds);
lib/decompress/zstd_decompress_block.c
+1 -1
View File
@@ -90,7 +90,7 @@ size_t ZSTD_decodeLiteralsBlock(ZSTD_DCtx* dctx,
case set_repeat:
DEBUGLOG(5, "set_repeat flag : re-using stats from previous compressed literals block");
RETURN_ERROR_IF(dctx->litEntropy==0, dictionary_corrupted, "");
/* fall-through */
ZSTD_FALLTHROUGH;
case set_compressed:
RETURN_ERROR_IF(srcSize < 5, corruption_detected, "srcSize >= MIN_CBLOCK_SIZE == 3; here we need up to 5 for case 3");