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-rw-r--r--ghc/rts/RetainerSet.c498
1 files changed, 0 insertions, 498 deletions
diff --git a/ghc/rts/RetainerSet.c b/ghc/rts/RetainerSet.c
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-/* -----------------------------------------------------------------------------
- *
- * (c) The GHC Team, 2001
- * Author: Sungwoo Park
- *
- * Retainer set implementation for retainer profiling (see RetainerProfile.c)
- *
- * ---------------------------------------------------------------------------*/
-
-#ifdef PROFILING
-
-#include "Rts.h"
-#include "RtsFlags.h"
-#include "Stats.h"
-#include "RtsUtils.h"
-#include "RetainerSet.h"
-#include "Arena.h"
-#include "Profiling.h"
-
-#include <stdlib.h>
-#include <string.h>
-
-#define HASH_TABLE_SIZE 255
-#define hash(hk) (hk % HASH_TABLE_SIZE)
-static RetainerSet *hashTable[HASH_TABLE_SIZE];
-
-static Arena *arena; // arena in which we store retainer sets
-
-static int nextId; // id of next retainer set
-
-/* -----------------------------------------------------------------------------
- * rs_MANY is a distinguished retainer set, such that
- *
- * isMember(e, rs_MANY) = True
- *
- * addElement(e, rs) = rs_MANY, if rs->num >= maxRetainerSetSize
- * addElement(e, rs_MANY) = rs_MANY
- *
- * The point of rs_MANY is to keep the total number of retainer sets
- * from growing too large.
- * -------------------------------------------------------------------------- */
-RetainerSet rs_MANY = {
- num : 0,
- hashKey : 0,
- link : NULL,
- id : 1,
- element : {}
-};
-
-/* -----------------------------------------------------------------------------
- * calculate the size of a RetainerSet structure
- * -------------------------------------------------------------------------- */
-STATIC_INLINE size_t
-sizeofRetainerSet( int elems )
-{
- return (sizeof(RetainerSet) + elems * sizeof(retainer));
-}
-
-/* -----------------------------------------------------------------------------
- * Creates the first pool and initializes hashTable[].
- * Frees all pools if any.
- * -------------------------------------------------------------------------- */
-void
-initializeAllRetainerSet(void)
-{
- int i;
-
- arena = newArena();
-
- for (i = 0; i < HASH_TABLE_SIZE; i++)
- hashTable[i] = NULL;
- nextId = 2; // Initial value must be positive, 2 is MANY.
-}
-
-/* -----------------------------------------------------------------------------
- * Refreshes all pools for reuse and initializes hashTable[].
- * -------------------------------------------------------------------------- */
-void
-refreshAllRetainerSet(void)
-{
-#ifdef FIRST_APPROACH
- int i;
-
- // first approach: completely refresh
- arenaFree(arena);
- arena = newArena();
-
- for (i = 0; i < HASH_TABLE_SIZE; i++)
- hashTable[i] = NULL;
- nextId = 2;
-#endif /* FIRST_APPROACH */
-}
-
-/* -----------------------------------------------------------------------------
- * Frees all pools.
- * -------------------------------------------------------------------------- */
-void
-closeAllRetainerSet(void)
-{
- arenaFree(arena);
-}
-
-/* -----------------------------------------------------------------------------
- * Finds or creates if needed a singleton retainer set.
- * -------------------------------------------------------------------------- */
-RetainerSet *
-singleton(retainer r)
-{
- RetainerSet *rs;
- StgWord hk;
-
- hk = hashKeySingleton(r);
- for (rs = hashTable[hash(hk)]; rs != NULL; rs = rs->link)
- if (rs->num == 1 && rs->element[0] == r) return rs; // found it
-
- // create it
- rs = arenaAlloc( arena, sizeofRetainerSet(1) );
- rs->num = 1;
- rs->hashKey = hk;
- rs->link = hashTable[hash(hk)];
- rs->id = nextId++;
- rs->element[0] = r;
-
- // The new retainer set is placed at the head of the linked list.
- hashTable[hash(hk)] = rs;
-
- return rs;
-}
-
-/* -----------------------------------------------------------------------------
- * Finds or creates a retainer set *rs augmented with r.
- * Invariants:
- * r is not a member of rs, i.e., isMember(r, rs) returns rtsFalse.
- * rs is not NULL.
- * Note:
- * We could check if rs is NULL, in which case this function call
- * reverts to singleton(). We do not choose this strategy because
- * in most cases addElement() is invoked with non-NULL rs.
- * -------------------------------------------------------------------------- */
-RetainerSet *
-addElement(retainer r, RetainerSet *rs)
-{
- nat i;
- nat nl; // Number of retainers in *rs Less than r
- RetainerSet *nrs; // New Retainer Set
- StgWord hk; // Hash Key
-
-#ifdef DEBUG_RETAINER
- // debugBelch("addElement(%p, %p) = ", r, rs);
-#endif
-
- ASSERT(rs != NULL);
- ASSERT(rs->num <= RtsFlags.ProfFlags.maxRetainerSetSize);
-
- if (rs == &rs_MANY || rs->num == RtsFlags.ProfFlags.maxRetainerSetSize) {
- return &rs_MANY;
- }
-
- ASSERT(!isMember(r, rs));
-
- for (nl = 0; nl < rs->num; nl++)
- if (r < rs->element[nl]) break;
- // Now nl is the index for r into the new set.
- // Also it denotes the number of retainers less than r in *rs.
- // Thus, compare the first nl retainers, then r itself, and finally the
- // remaining (rs->num - nl) retainers.
-
- hk = hashKeyAddElement(r, rs);
- for (nrs = hashTable[hash(hk)]; nrs != NULL; nrs = nrs->link) {
- // test *rs and *nrs for equality
-
- // check their size
- if (rs->num + 1 != nrs->num) continue;
-
- // compare the first nl retainers and find the first non-matching one.
- for (i = 0; i < nl; i++)
- if (rs->element[i] != nrs->element[i]) break;
- if (i < nl) continue;
-
- // compare r itself
- if (r != nrs->element[i]) continue; // i == nl
-
- // compare the remaining retainers
- for (; i < rs->num; i++)
- if (rs->element[i] != nrs->element[i + 1]) break;
- if (i < rs->num) continue;
-
-#ifdef DEBUG_RETAINER
- // debugBelch("%p\n", nrs);
-#endif
- // The set we are seeking already exists!
- return nrs;
- }
-
- // create a new retainer set
- nrs = arenaAlloc( arena, sizeofRetainerSet(rs->num + 1) );
- nrs->num = rs->num + 1;
- nrs->hashKey = hk;
- nrs->link = hashTable[hash(hk)];
- nrs->id = nextId++;
- for (i = 0; i < nl; i++) { // copy the first nl retainers
- nrs->element[i] = rs->element[i];
- }
- nrs->element[i] = r; // copy r
- for (; i < rs->num; i++) { // copy the remaining retainers
- nrs->element[i + 1] = rs->element[i];
- }
-
- hashTable[hash(hk)] = nrs;
-
-#ifdef DEBUG_RETAINER
- // debugBelch("%p\n", nrs);
-#endif
- return nrs;
-}
-
-/* -----------------------------------------------------------------------------
- * Call f() for each retainer set.
- * -------------------------------------------------------------------------- */
-void
-traverseAllRetainerSet(void (*f)(RetainerSet *))
-{
- int i;
- RetainerSet *rs;
-
- (*f)(&rs_MANY);
- for (i = 0; i < HASH_TABLE_SIZE; i++)
- for (rs = hashTable[i]; rs != NULL; rs = rs->link)
- (*f)(rs);
-}
-
-
-/* -----------------------------------------------------------------------------
- * printRetainer() prints the full information on a given retainer,
- * not a retainer set.
- * -------------------------------------------------------------------------- */
-#if defined(RETAINER_SCHEME_INFO)
-// Retainer scheme 1: retainer = info table
-void
-printRetainer(FILE *f, retainer itbl)
-{
- fprintf(f, "%s[%s]", itbl->prof.closure_desc, itbl->prof.closure_type);
-}
-#elif defined(RETAINER_SCHEME_CCS)
-// Retainer scheme 2: retainer = cost centre stack
-void
-printRetainer(FILE *f, retainer ccs)
-{
- fprintCCS(f, ccs);
-}
-#elif defined(RETAINER_SCHEME_CC)
-// Retainer scheme 3: retainer = cost centre
-void
-printRetainer(FILE *f, retainer cc)
-{
- fprintf(f,"%s.%s", cc->module, cc->label);
-}
-#endif
-
-/* -----------------------------------------------------------------------------
- * printRetainerSetShort() should always display the same output for
- * a given retainer set regardless of the time of invocation.
- * -------------------------------------------------------------------------- */
-#ifdef SECOND_APPROACH
-#if defined(RETAINER_SCHEME_INFO)
-// Retainer scheme 1: retainer = info table
-void
-printRetainerSetShort(FILE *f, RetainerSet *rs)
-{
-#define MAX_RETAINER_SET_SPACE 24
- char tmp[MAX_RETAINER_SET_SPACE + 1];
- int size;
- nat j;
-
- ASSERT(rs->id < 0);
-
- tmp[MAX_RETAINER_SET_SPACE] = '\0';
-
- // No blank characters are allowed.
- sprintf(tmp + 0, "(%d)", -(rs->id));
- size = strlen(tmp);
- ASSERT(size < MAX_RETAINER_SET_SPACE);
-
- for (j = 0; j < rs->num; j++) {
- if (j < rs->num - 1) {
- strncpy(tmp + size, rs->element[j]->prof.closure_desc, MAX_RETAINER_SET_SPACE - size);
- size = strlen(tmp);
- if (size == MAX_RETAINER_SET_SPACE)
- break;
- strncpy(tmp + size, ",", MAX_RETAINER_SET_SPACE - size);
- size = strlen(tmp);
- if (size == MAX_RETAINER_SET_SPACE)
- break;
- }
- else {
- strncpy(tmp + size, rs->element[j]->prof.closure_desc, MAX_RETAINER_SET_SPACE - size);
- // size = strlen(tmp);
- }
- }
- fprintf(f, tmp);
-}
-#elif defined(RETAINER_SCHEME_CC)
-// Retainer scheme 3: retainer = cost centre
-void
-printRetainerSetShort(FILE *f, RetainerSet *rs)
-{
-#define MAX_RETAINER_SET_SPACE 24
- char tmp[MAX_RETAINER_SET_SPACE + 1];
- int size;
- nat j;
-
-}
-#elif defined(RETAINER_SCHEME_CCS)
-// Retainer scheme 2: retainer = cost centre stack
-void
-printRetainerSetShort(FILE *f, RetainerSet *rs)
-{
-#define MAX_RETAINER_SET_SPACE 24
- char tmp[MAX_RETAINER_SET_SPACE + 1];
- int size;
- nat j;
-
- ASSERT(rs->id < 0);
-
- tmp[MAX_RETAINER_SET_SPACE] = '\0';
-
- // No blank characters are allowed.
- sprintf(tmp + 0, "(%d)", -(rs->id));
- size = strlen(tmp);
- ASSERT(size < MAX_RETAINER_SET_SPACE);
-
- for (j = 0; j < rs->num; j++) {
- if (j < rs->num - 1) {
- strncpy(tmp + size, rs->element[j]->cc->label, MAX_RETAINER_SET_SPACE - size);
- size = strlen(tmp);
- if (size == MAX_RETAINER_SET_SPACE)
- break;
- strncpy(tmp + size, ",", MAX_RETAINER_SET_SPACE - size);
- size = strlen(tmp);
- if (size == MAX_RETAINER_SET_SPACE)
- break;
- }
- else {
- strncpy(tmp + size, rs->element[j]->cc->label, MAX_RETAINER_SET_SPACE - size);
- // size = strlen(tmp);
- }
- }
- fprintf(f, tmp);
-}
-#elif defined(RETAINER_SCHEME_CC)
-// Retainer scheme 3: retainer = cost centre
-static void
-printRetainerSetShort(FILE *f, retainerSet *rs)
-{
-#define MAX_RETAINER_SET_SPACE 24
- char tmp[MAX_RETAINER_SET_SPACE + 1];
- int size;
- nat j;
-
- ASSERT(rs->id < 0);
-
- tmp[MAX_RETAINER_SET_SPACE] = '\0';
-
- // No blank characters are allowed.
- sprintf(tmp + 0, "(%d)", -(rs->id));
- size = strlen(tmp);
- ASSERT(size < MAX_RETAINER_SET_SPACE);
-
- for (j = 0; j < rs->num; j++) {
- if (j < rs->num - 1) {
- strncpy(tmp + size, rs->element[j]->label,
- MAX_RETAINER_SET_SPACE - size);
- size = strlen(tmp);
- if (size == MAX_RETAINER_SET_SPACE)
- break;
- strncpy(tmp + size, ",", MAX_RETAINER_SET_SPACE - size);
- size = strlen(tmp);
- if (size == MAX_RETAINER_SET_SPACE)
- break;
- }
- else {
- strncpy(tmp + size, rs->element[j]->label,
- MAX_RETAINER_SET_SPACE - size);
- // size = strlen(tmp);
- }
- }
- fprintf(f, tmp);
-/*
- #define MAX_RETAINER_SET_SPACE 24
- #define DOT_NUMBER 3
- // 1. 32 > MAX_RETAINER_SET_SPACE + 1 (1 for '\0')
- // 2. (MAX_RETAINER_SET_SPACE - DOT_NUMBER ) characters should be enough for
- // printing one natural number (plus '(' and ')').
- char tmp[32];
- int size, ts;
- nat j;
-
- ASSERT(rs->id < 0);
-
- // No blank characters are allowed.
- sprintf(tmp + 0, "(%d)", -(rs->id));
- size = strlen(tmp);
- ASSERT(size < MAX_RETAINER_SET_SPACE - DOT_NUMBER);
-
- for (j = 0; j < rs->num; j++) {
- ts = strlen(rs->element[j]->label);
- if (j < rs->num - 1) {
- if (size + ts + 1 > MAX_RETAINER_SET_SPACE - DOT_NUMBER) {
- sprintf(tmp + size, "...");
- break;
- }
- sprintf(tmp + size, "%s,", rs->element[j]->label);
- size += ts + 1;
- }
- else {
- if (size + ts > MAX_RETAINER_SET_SPACE - DOT_NUMBER) {
- sprintf(tmp + size, "...");
- break;
- }
- sprintf(tmp + size, "%s", rs->element[j]->label);
- size += ts;
- }
- }
- fprintf(f, tmp);
-*/
-}
-#endif /* RETAINER_SCHEME_CC */
-#endif /* SECOND_APPROACH */
-
-/* -----------------------------------------------------------------------------
- * Dump the contents of each retainer set into the log file at the end
- * of the run, so the user can find out for a given retainer set ID
- * the full contents of that set.
- * --------------------------------------------------------------------------- */
-#ifdef SECOND_APPROACH
-void
-outputAllRetainerSet(FILE *prof_file)
-{
- nat i, j;
- nat numSet;
- RetainerSet *rs, **rsArray, *tmp;
-
- // find out the number of retainer sets which have had a non-zero cost at
- // least once during retainer profiling
- numSet = 0;
- for (i = 0; i < HASH_TABLE_SIZE; i++)
- for (rs = hashTable[i]; rs != NULL; rs = rs->link) {
- if (rs->id < 0)
- numSet++;
- }
-
- if (numSet == 0) // retainer profiling was not done at all.
- return;
-
- // allocate memory
- rsArray = stgMallocBytes(numSet * sizeof(RetainerSet *),
- "outputAllRetainerSet()");
-
- // prepare for sorting
- j = 0;
- for (i = 0; i < HASH_TABLE_SIZE; i++)
- for (rs = hashTable[i]; rs != NULL; rs = rs->link) {
- if (rs->id < 0) {
- rsArray[j] = rs;
- j++;
- }
- }
-
- ASSERT(j == numSet);
-
- // sort rsArray[] according to the id of each retainer set
- for (i = numSet - 1; i > 0; i--) {
- for (j = 0; j <= i - 1; j++) {
- // if (-(rsArray[j]->id) < -(rsArray[j + 1]->id))
- if (rsArray[j]->id < rsArray[j + 1]->id) {
- tmp = rsArray[j];
- rsArray[j] = rsArray[j + 1];
- rsArray[j + 1] = tmp;
- }
- }
- }
-
- fprintf(prof_file, "\nRetainer sets created during profiling:\n");
- for (i = 0;i < numSet; i++) {
- fprintf(prof_file, "SET %u = {", -(rsArray[i]->id));
- for (j = 0; j < rsArray[i]->num - 1; j++) {
- printRetainer(prof_file, rsArray[i]->element[j]);
- fprintf(prof_file, ", ");
- }
- printRetainer(prof_file, rsArray[i]->element[j]);
- fprintf(prof_file, "}\n");
- }
-
- stgFree(rsArray);
-}
-#endif /* SECOND_APPROACH */
-
-#endif /* PROFILING */
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