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author | Alan Mishchenko <alanmi@berkeley.edu> | 2007-10-01 08:01:00 -0700 |
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committer | Alan Mishchenko <alanmi@berkeley.edu> | 2007-10-01 08:01:00 -0700 |
commit | 4812c90424dfc40d26725244723887a2d16ddfd9 (patch) | |
tree | b32ace96e7e2d84d586e09ba605463b6f49c3271 /src/sat/msat/msatMem.c | |
parent | e54d9691616b9a0326e2fdb3156bb4eeb8abfcd7 (diff) | |
download | abc-4812c90424dfc40d26725244723887a2d16ddfd9.tar.gz abc-4812c90424dfc40d26725244723887a2d16ddfd9.tar.bz2 abc-4812c90424dfc40d26725244723887a2d16ddfd9.zip |
Version abc71001
Diffstat (limited to 'src/sat/msat/msatMem.c')
-rw-r--r-- | src/sat/msat/msatMem.c | 529 |
1 files changed, 529 insertions, 0 deletions
diff --git a/src/sat/msat/msatMem.c b/src/sat/msat/msatMem.c new file mode 100644 index 00000000..30bf4a96 --- /dev/null +++ b/src/sat/msat/msatMem.c @@ -0,0 +1,529 @@ +/**CFile**************************************************************** + + FileName [msatMem.c] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [Memory managers borrowed from Extra.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msatMem.c,v 1.0 2004/01/01 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "msatInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +struct Msat_MmFixed_t_ +{ + // information about individual entries + int nEntrySize; // the size of one entry + int nEntriesAlloc; // the total number of entries allocated + int nEntriesUsed; // the number of entries in use + int nEntriesMax; // the max number of entries in use + char * pEntriesFree; // the linked list of free entries + + // this is where the memory is stored + int nChunkSize; // the size of one chunk + int nChunksAlloc; // the maximum number of memory chunks + int nChunks; // the current number of memory chunks + char ** pChunks; // the allocated memory + + // statistics + int nMemoryUsed; // memory used in the allocated entries + int nMemoryAlloc; // memory allocated +}; + +struct Msat_MmFlex_t_ +{ + // information about individual entries + int nEntriesUsed; // the number of entries allocated + char * pCurrent; // the current pointer to free memory + char * pEnd; // the first entry outside the free memory + + // this is where the memory is stored + int nChunkSize; // the size of one chunk + int nChunksAlloc; // the maximum number of memory chunks + int nChunks; // the current number of memory chunks + char ** pChunks; // the allocated memory + + // statistics + int nMemoryUsed; // memory used in the allocated entries + int nMemoryAlloc; // memory allocated +}; + + +struct Msat_MmStep_t_ +{ + int nMems; // the number of fixed memory managers employed + Msat_MmFixed_t ** pMems; // memory managers: 2^1 words, 2^2 words, etc + int nMapSize; // the size of the memory array + Msat_MmFixed_t ** pMap; // maps the number of bytes into its memory manager +}; + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Allocates memory pieces of fixed size.] + + Description [The size of the chunk is computed as the minimum of + 1024 entries and 64K. Can only work with entry size at least 4 byte long.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_MmFixed_t * Msat_MmFixedStart( int nEntrySize ) +{ + Msat_MmFixed_t * p; + + p = ALLOC( Msat_MmFixed_t, 1 ); + memset( p, 0, sizeof(Msat_MmFixed_t) ); + + p->nEntrySize = nEntrySize; + p->nEntriesAlloc = 0; + p->nEntriesUsed = 0; + p->pEntriesFree = NULL; + + if ( nEntrySize * (1 << 10) < (1<<16) ) + p->nChunkSize = (1 << 10); + else + p->nChunkSize = (1<<16) / nEntrySize; + if ( p->nChunkSize < 8 ) + p->nChunkSize = 8; + + p->nChunksAlloc = 64; + p->nChunks = 0; + p->pChunks = ALLOC( char *, p->nChunksAlloc ); + + p->nMemoryUsed = 0; + p->nMemoryAlloc = 0; + return p; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_MmFixedStop( Msat_MmFixed_t * p, int fVerbose ) +{ + int i; + if ( p == NULL ) + return; + if ( fVerbose ) + { + printf( "Fixed memory manager: Entry = %5d. Chunk = %5d. Chunks used = %5d.\n", + p->nEntrySize, p->nChunkSize, p->nChunks ); + printf( " Entries used = %8d. Entries peak = %8d. Memory used = %8d. Memory alloc = %8d.\n", + p->nEntriesUsed, p->nEntriesMax, p->nEntrySize * p->nEntriesUsed, p->nMemoryAlloc ); + } + for ( i = 0; i < p->nChunks; i++ ) + free( p->pChunks[i] ); + free( p->pChunks ); + free( p ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +char * Msat_MmFixedEntryFetch( Msat_MmFixed_t * p ) +{ + char * pTemp; + int i; + + // check if there are still free entries + if ( p->nEntriesUsed == p->nEntriesAlloc ) + { // need to allocate more entries + assert( p->pEntriesFree == NULL ); + if ( p->nChunks == p->nChunksAlloc ) + { + p->nChunksAlloc *= 2; + p->pChunks = REALLOC( char *, p->pChunks, p->nChunksAlloc ); + } + p->pEntriesFree = ALLOC( char, p->nEntrySize * p->nChunkSize ); + p->nMemoryAlloc += p->nEntrySize * p->nChunkSize; + // transform these entries into a linked list + pTemp = p->pEntriesFree; + for ( i = 1; i < p->nChunkSize; i++ ) + { + *((char **)pTemp) = pTemp + p->nEntrySize; + pTemp += p->nEntrySize; + } + // set the last link + *((char **)pTemp) = NULL; + // add the chunk to the chunk storage + p->pChunks[ p->nChunks++ ] = p->pEntriesFree; + // add to the number of entries allocated + p->nEntriesAlloc += p->nChunkSize; + } + // incrememt the counter of used entries + p->nEntriesUsed++; + if ( p->nEntriesMax < p->nEntriesUsed ) + p->nEntriesMax = p->nEntriesUsed; + // return the first entry in the free entry list + pTemp = p->pEntriesFree; + p->pEntriesFree = *((char **)pTemp); + return pTemp; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_MmFixedEntryRecycle( Msat_MmFixed_t * p, char * pEntry ) +{ + // decrement the counter of used entries + p->nEntriesUsed--; + // add the entry to the linked list of free entries + *((char **)pEntry) = p->pEntriesFree; + p->pEntriesFree = pEntry; +} + +/**Function************************************************************* + + Synopsis [] + + Description [Relocates all the memory except the first chunk.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_MmFixedRestart( Msat_MmFixed_t * p ) +{ + int i; + char * pTemp; + + // deallocate all chunks except the first one + for ( i = 1; i < p->nChunks; i++ ) + free( p->pChunks[i] ); + p->nChunks = 1; + // transform these entries into a linked list + pTemp = p->pChunks[0]; + for ( i = 1; i < p->nChunkSize; i++ ) + { + *((char **)pTemp) = pTemp + p->nEntrySize; + pTemp += p->nEntrySize; + } + // set the last link + *((char **)pTemp) = NULL; + // set the free entry list + p->pEntriesFree = p->pChunks[0]; + // set the correct statistics + p->nMemoryAlloc = p->nEntrySize * p->nChunkSize; + p->nMemoryUsed = 0; + p->nEntriesAlloc = p->nChunkSize; + p->nEntriesUsed = 0; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_MmFixedReadMemUsage( Msat_MmFixed_t * p ) +{ + return p->nMemoryAlloc; +} + + + +/**Function************************************************************* + + Synopsis [Allocates entries of flexible size.] + + Description [Can only work with entry size at least 4 byte long.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_MmFlex_t * Msat_MmFlexStart() +{ + Msat_MmFlex_t * p; + + p = ALLOC( Msat_MmFlex_t, 1 ); + memset( p, 0, sizeof(Msat_MmFlex_t) ); + + p->nEntriesUsed = 0; + p->pCurrent = NULL; + p->pEnd = NULL; + + p->nChunkSize = (1 << 12); + p->nChunksAlloc = 64; + p->nChunks = 0; + p->pChunks = ALLOC( char *, p->nChunksAlloc ); + + p->nMemoryUsed = 0; + p->nMemoryAlloc = 0; + return p; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_MmFlexStop( Msat_MmFlex_t * p, int fVerbose ) +{ + int i; + if ( p == NULL ) + return; + if ( fVerbose ) + { + printf( "Flexible memory manager: Chunk size = %d. Chunks used = %d.\n", + p->nChunkSize, p->nChunks ); + printf( " Entries used = %d. Memory used = %d. Memory alloc = %d.\n", + p->nEntriesUsed, p->nMemoryUsed, p->nMemoryAlloc ); + } + for ( i = 0; i < p->nChunks; i++ ) + free( p->pChunks[i] ); + free( p->pChunks ); + free( p ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +char * Msat_MmFlexEntryFetch( Msat_MmFlex_t * p, int nBytes ) +{ + char * pTemp; + // check if there are still free entries + if ( p->pCurrent == NULL || p->pCurrent + nBytes > p->pEnd ) + { // need to allocate more entries + if ( p->nChunks == p->nChunksAlloc ) + { + p->nChunksAlloc *= 2; + p->pChunks = REALLOC( char *, p->pChunks, p->nChunksAlloc ); + } + if ( nBytes > p->nChunkSize ) + { + // resize the chunk size if more memory is requested than it can give + // (ideally, this should never happen) + p->nChunkSize = 2 * nBytes; + } + p->pCurrent = ALLOC( char, p->nChunkSize ); + p->pEnd = p->pCurrent + p->nChunkSize; + p->nMemoryAlloc += p->nChunkSize; + // add the chunk to the chunk storage + p->pChunks[ p->nChunks++ ] = p->pCurrent; + } + assert( p->pCurrent + nBytes <= p->pEnd ); + // increment the counter of used entries + p->nEntriesUsed++; + // keep track of the memory used + p->nMemoryUsed += nBytes; + // return the next entry + pTemp = p->pCurrent; + p->pCurrent += nBytes; + return pTemp; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_MmFlexReadMemUsage( Msat_MmFlex_t * p ) +{ + return p->nMemoryAlloc; +} + + + + + +/**Function************************************************************* + + Synopsis [Starts the hierarchical memory manager.] + + Description [This manager can allocate entries of any size. + Iternally they are mapped into the entries with the number of bytes + equal to the power of 2. The smallest entry size is 8 bytes. The + next one is 16 bytes etc. So, if the user requests 6 bytes, he gets + 8 byte entry. If we asks for 25 bytes, he gets 32 byte entry etc. + The input parameters "nSteps" says how many fixed memory managers + are employed internally. Calling this procedure with nSteps equal + to 10 results in 10 hierarchically arranged internal memory managers, + which can allocate up to 4096 (1Kb) entries. Requests for larger + entries are handed over to malloc() and then free()ed.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_MmStep_t * Msat_MmStepStart( int nSteps ) +{ + Msat_MmStep_t * p; + int i, k; + p = ALLOC( Msat_MmStep_t, 1 ); + p->nMems = nSteps; + // start the fixed memory managers + p->pMems = ALLOC( Msat_MmFixed_t *, p->nMems ); + for ( i = 0; i < p->nMems; i++ ) + p->pMems[i] = Msat_MmFixedStart( (8<<i) ); + // set up the mapping of the required memory size into the corresponding manager + p->nMapSize = (4<<p->nMems); + p->pMap = ALLOC( Msat_MmFixed_t *, p->nMapSize+1 ); + p->pMap[0] = NULL; + for ( k = 1; k <= 4; k++ ) + p->pMap[k] = p->pMems[0]; + for ( i = 0; i < p->nMems; i++ ) + for ( k = (4<<i)+1; k <= (8<<i); k++ ) + p->pMap[k] = p->pMems[i]; +//for ( i = 1; i < 100; i ++ ) +//printf( "%10d: size = %10d\n", i, p->pMap[i]->nEntrySize ); + return p; +} + +/**Function************************************************************* + + Synopsis [Stops the memory manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_MmStepStop( Msat_MmStep_t * p, int fVerbose ) +{ + int i; + for ( i = 0; i < p->nMems; i++ ) + Msat_MmFixedStop( p->pMems[i], fVerbose ); + free( p->pMems ); + free( p->pMap ); + free( p ); +} + +/**Function************************************************************* + + Synopsis [Creates the entry.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +char * Msat_MmStepEntryFetch( Msat_MmStep_t * p, int nBytes ) +{ + if ( nBytes == 0 ) + return NULL; + if ( nBytes > p->nMapSize ) + { +// printf( "Allocating %d bytes.\n", nBytes ); + return ALLOC( char, nBytes ); + } + return Msat_MmFixedEntryFetch( p->pMap[nBytes] ); +} + + +/**Function************************************************************* + + Synopsis [Recycles the entry.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_MmStepEntryRecycle( Msat_MmStep_t * p, char * pEntry, int nBytes ) +{ + if ( nBytes == 0 ) + return; + if ( nBytes > p->nMapSize ) + { + free( pEntry ); + return; + } + Msat_MmFixedEntryRecycle( p->pMap[nBytes], pEntry ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_MmStepReadMemUsage( Msat_MmStep_t * p ) +{ + int i, nMemTotal = 0; + for ( i = 0; i < p->nMems; i++ ) + nMemTotal += p->pMems[i]->nMemoryAlloc; + return nMemTotal; +} |