Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 493 insertions, 0 deletions

diff --git a/mysys/my_alloc.c b/mysys/my_alloc.c
new file mode 100644
index 00000000..3e0b774b
--- /dev/null
+++ b/mysys/my_alloc.c
@@ -0,0 +1,493 @@
+/*
+   Copyright (c) 2000, 2010, Oracle and/or its affiliates
+   Copyright (c) 2010, 2020, MariaDB
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+/* Routines to handle mallocing of results which will be freed the same time */
+
+#include <my_global.h>
+#include <my_sys.h>
+#include <m_string.h>
+#undef EXTRA_DEBUG
+#define EXTRA_DEBUG
+
+/* data packed in MEM_ROOT -> min_malloc */
+
+#define MALLOC_FLAG(A) ((A & 1) ? MY_THREAD_SPECIFIC : 0)
+
+#define TRASH_MEM(X) TRASH_FREE(((char*)(X) + ((X)->size-(X)->left)), (X)->left)
+
+/*
+  Initialize memory root
+
+  SYNOPSIS
+    init_alloc_root()
+      mem_root       - memory root to initialize
+      name           - name of memroot (for debugging)
+      block_size     - size of chunks (blocks) used for memory allocation
+                       (It is external size of chunk i.e. it should include
+                        memory required for internal structures, thus it
+                        should be no less than ALLOC_ROOT_MIN_BLOCK_SIZE)
+      pre_alloc_size - if non-0, then size of block that should be
+                       pre-allocated during memory root initialization.
+      my_flags	       MY_THREAD_SPECIFIC flag for my_malloc
+
+  DESCRIPTION
+    This function prepares memory root for further use, sets initial size of
+    chunk for memory allocation and pre-allocates first block if specified.
+    Although error can happen during execution of this function if
+    pre_alloc_size is non-0 it won't be reported. Instead it will be
+    reported as error in first alloc_root() on this memory root.
+
+    We don't want to change the structure size for MEM_ROOT.
+    Because of this, we store in MY_THREAD_SPECIFIC as bit 1 in block_size
+*/
+
+void init_alloc_root(PSI_memory_key key, MEM_ROOT *mem_root, size_t block_size,
+		     size_t pre_alloc_size __attribute__((unused)),
+                     myf my_flags)
+{
+  DBUG_ENTER("init_alloc_root");
+  DBUG_PRINT("enter",("root: %p  prealloc: %zu", mem_root, pre_alloc_size));
+
+  mem_root->free= mem_root->used= mem_root->pre_alloc= 0;
+  mem_root->min_malloc= 32;
+  mem_root->block_size= (block_size - ALLOC_ROOT_MIN_BLOCK_SIZE) & ~1;
+  if (my_flags & MY_THREAD_SPECIFIC)
+    mem_root->block_size|= 1;
+
+  mem_root->error_handler= 0;
+  mem_root->block_num= 4;			/* We shift this with >>2 */
+  mem_root->first_block_usage= 0;
+  mem_root->m_psi_key= key;
+
+#if !(defined(HAVE_valgrind) && defined(EXTRA_DEBUG))
+  if (pre_alloc_size)
+  {
+    size_t size= pre_alloc_size + ALIGN_SIZE(sizeof(USED_MEM));
+    if ((mem_root->free= mem_root->pre_alloc=
+         (USED_MEM*) my_malloc(key, size, MYF(my_flags))))
+    {
+      mem_root->free->size= size;
+      mem_root->free->left= pre_alloc_size;
+      mem_root->free->next= 0;
+      TRASH_MEM(mem_root->free);
+    }
+  }
+#endif
+  DBUG_VOID_RETURN;
+}
+
+/*
+  SYNOPSIS
+    reset_root_defaults()
+    mem_root        memory root to change defaults of
+    block_size      new value of block size. Must be greater or equal
+                    than ALLOC_ROOT_MIN_BLOCK_SIZE (this value is about
+                    68 bytes and depends on platform and compilation flags)
+    pre_alloc_size  new size of preallocated block. If not zero,
+                    must be equal to or greater than block size,
+                    otherwise means 'no prealloc'.
+  DESCRIPTION
+    Function aligns and assigns new value to block size; then it tries to
+    reuse one of existing blocks as prealloc block, or malloc new one of
+    requested size. If no blocks can be reused, all unused blocks are freed
+    before allocation.
+*/
+
+void reset_root_defaults(MEM_ROOT *mem_root, size_t block_size,
+                         size_t pre_alloc_size __attribute__((unused)))
+{
+  DBUG_ENTER("reset_root_defaults");
+  DBUG_ASSERT(alloc_root_inited(mem_root));
+
+  mem_root->block_size= (((block_size - ALLOC_ROOT_MIN_BLOCK_SIZE) & ~1) |
+                         (mem_root->block_size & 1));
+#if !(defined(HAVE_valgrind) && defined(EXTRA_DEBUG))
+  if (pre_alloc_size)
+  {
+    size_t size= pre_alloc_size + ALIGN_SIZE(sizeof(USED_MEM));
+    if (!mem_root->pre_alloc || mem_root->pre_alloc->size != size)
+    {
+      USED_MEM *mem, **prev= &mem_root->free;
+      /*
+        Free unused blocks, so that consequent calls
+        to reset_root_defaults won't eat away memory.
+      */
+      while (*prev)
+      {
+        mem= *prev;
+        if (mem->size == size)
+        {
+          /* We found a suitable block, no need to do anything else */
+          mem_root->pre_alloc= mem;
+          DBUG_VOID_RETURN;
+        }
+        if (mem->left + ALIGN_SIZE(sizeof(USED_MEM)) == mem->size)
+        {
+          /* remove block from the list and free it */
+          *prev= mem->next;
+          my_free(mem);
+        }
+        else
+          prev= &mem->next;
+      }
+      /* Allocate new prealloc block and add it to the end of free list */
+      if ((mem= (USED_MEM *) my_malloc(mem_root->m_psi_key, size,
+                                       MYF(MALLOC_FLAG(mem_root->
+                                                       block_size)))))
+      {
+        mem->size= size; 
+        mem->left= pre_alloc_size;
+        mem->next= *prev;
+        *prev= mem_root->pre_alloc= mem;
+        TRASH_MEM(mem);
+      }
+      else
+      {
+        mem_root->pre_alloc= 0;
+      }
+    }
+  }
+  else
+#endif
+    mem_root->pre_alloc= 0;
+
+  DBUG_VOID_RETURN;
+}
+
+
+void *alloc_root(MEM_ROOT *mem_root, size_t length)
+{
+#if defined(HAVE_valgrind) && defined(EXTRA_DEBUG)
+  reg1 USED_MEM *next;
+  DBUG_ENTER("alloc_root");
+  DBUG_PRINT("enter",("root: %p", mem_root));
+
+  DBUG_ASSERT(alloc_root_inited(mem_root));
+
+  DBUG_EXECUTE_IF("simulate_out_of_memory",
+                  {
+                    if (mem_root->error_handler)
+                      (*mem_root->error_handler)();
+                    DBUG_SET("-d,simulate_out_of_memory");
+                    DBUG_RETURN((void*) 0); /* purecov: inspected */
+                  });
+
+  length+=ALIGN_SIZE(sizeof(USED_MEM));
+  if (!(next = (USED_MEM*) my_malloc(mem_root->m_psi_key, length,
+                                     MYF(MY_WME | ME_FATAL |
+                                         MALLOC_FLAG(mem_root->block_size)))))
+  {
+    if (mem_root->error_handler)
+      (*mem_root->error_handler)();
+    DBUG_RETURN((uchar*) 0);			/* purecov: inspected */
+  }
+  next->next= mem_root->used;
+  next->left= 0;
+  next->size= length;
+  mem_root->used= next;
+  DBUG_PRINT("exit",("ptr: %p", (((char*)next)+ALIGN_SIZE(sizeof(USED_MEM)))));
+  DBUG_RETURN((((uchar*) next)+ALIGN_SIZE(sizeof(USED_MEM))));
+#else
+  size_t get_size, block_size;
+  uchar* point;
+  reg1 USED_MEM *next= 0;
+  reg2 USED_MEM **prev;
+  size_t original_length __attribute__((unused)) = length;
+  DBUG_ENTER("alloc_root");
+  DBUG_PRINT("enter",("root: %p", mem_root));
+  DBUG_ASSERT(alloc_root_inited(mem_root));
+
+  DBUG_EXECUTE_IF("simulate_out_of_memory",
+                  {
+                    /* Avoid reusing an already allocated block */
+                    if (mem_root->error_handler)
+                      (*mem_root->error_handler)();
+                    DBUG_SET("-d,simulate_out_of_memory");
+                    DBUG_RETURN((void*) 0); /* purecov: inspected */
+                  });
+  length= ALIGN_SIZE(length) + REDZONE_SIZE;
+  if ((*(prev= &mem_root->free)) != NULL)
+  {
+    if ((*prev)->left < length &&
+	mem_root->first_block_usage++ >= ALLOC_MAX_BLOCK_USAGE_BEFORE_DROP &&
+	(*prev)->left < ALLOC_MAX_BLOCK_TO_DROP)
+    {
+      next= *prev;
+      *prev= next->next;			/* Remove block from list */
+      next->next= mem_root->used;
+      mem_root->used= next;
+      mem_root->first_block_usage= 0;
+    }
+    for (next= *prev ; next && next->left < length ; next= next->next)
+      prev= &next->next;
+  }
+  if (! next)
+  {						/* Time to alloc new block */
+    block_size= (mem_root->block_size & ~1) * (mem_root->block_num >> 2);
+    get_size= length+ALIGN_SIZE(sizeof(USED_MEM));
+    get_size= MY_MAX(get_size, block_size);
+
+    if (!(next = (USED_MEM*) my_malloc(mem_root->m_psi_key, get_size,
+                                       MYF(MY_WME | ME_FATAL |
+                                           MALLOC_FLAG(mem_root->
+                                                       block_size)))))
+    {
+      if (mem_root->error_handler)
+	(*mem_root->error_handler)();
+      DBUG_RETURN((void*) 0);                      /* purecov: inspected */
+    }
+    mem_root->block_num++;
+    next->next= *prev;
+    next->size= get_size;
+    next->left= get_size-ALIGN_SIZE(sizeof(USED_MEM));
+    *prev=next;
+    TRASH_MEM(next);
+  }
+
+  point= (uchar*) ((char*) next+ (next->size-next->left));
+  /*TODO: next part may be unneded due to mem_root->first_block_usage counter*/
+  if ((next->left-= length) < mem_root->min_malloc)
+  {						/* Full block */
+    *prev= next->next;				/* Remove block from list */
+    next->next= mem_root->used;
+    mem_root->used= next;
+    mem_root->first_block_usage= 0;
+  }
+  point+= REDZONE_SIZE;
+  TRASH_ALLOC(point, original_length);
+  DBUG_PRINT("exit",("ptr: %p", point));
+  DBUG_RETURN((void*) point);
+#endif
+}
+
+
+/*
+  Allocate many pointers at the same time.
+
+  DESCRIPTION
+    ptr1, ptr2, etc all point into big allocated memory area.
+
+  SYNOPSIS
+    multi_alloc_root()
+      root               Memory root
+      ptr1, length1      Multiple arguments terminated by a NULL pointer
+      ptr2, length2      ...
+      ...
+      NULL
+
+  RETURN VALUE
+    A pointer to the beginning of the allocated memory block
+    in case of success or NULL if out of memory.
+*/
+
+void *multi_alloc_root(MEM_ROOT *root, ...)
+{
+  va_list args;
+  char **ptr, *start, *res;
+  size_t tot_length, length;
+  DBUG_ENTER("multi_alloc_root");
+  /*
+    We  don't need to do DBUG_PRINT here as it will be done when alloc_root
+    is called
+  */
+
+  va_start(args, root);
+  tot_length= 0;
+  while ((ptr= va_arg(args, char **)))
+  {
+    length= va_arg(args, uint);
+    tot_length+= ALIGN_SIZE(length);
+  }
+  va_end(args);
+
+  if (!(start= (char*) alloc_root(root, tot_length)))
+    DBUG_RETURN(0);                            /* purecov: inspected */
+
+  va_start(args, root);
+  res= start;
+  while ((ptr= va_arg(args, char **)))
+  {
+    *ptr= res;
+    length= va_arg(args, uint);
+    res+= ALIGN_SIZE(length);
+  }
+  va_end(args);
+  DBUG_RETURN((void*) start);
+}
+
+
+#if !(defined(HAVE_valgrind) && defined(EXTRA_DEBUG))
+/** Mark all data in blocks free for reusage */
+
+static inline void mark_blocks_free(MEM_ROOT* root)
+{
+  reg1 USED_MEM *next;
+  reg2 USED_MEM **last;
+
+  /* iterate through (partially) free blocks, mark them free */
+  last= &root->free;
+  for (next= root->free; next; next= *(last= &next->next))
+  {
+    next->left= next->size - ALIGN_SIZE(sizeof(USED_MEM));
+    TRASH_MEM(next);
+  }
+
+  /* Combine the free and the used list */
+  *last= next=root->used;
+
+  /* now go through the used blocks and mark them free */
+  for (; next; next= next->next)
+  {
+    next->left= next->size - ALIGN_SIZE(sizeof(USED_MEM));
+    TRASH_MEM(next);
+  }
+
+  /* Now everything is set; Indicate that nothing is used anymore */
+  root->used= 0;
+  root->first_block_usage= 0;
+  root->block_num= 4;
+}
+#endif
+
+
+/*
+  Deallocate everything used by alloc_root or just move
+  used blocks to free list if called with MY_USED_TO_FREE
+
+  SYNOPSIS
+    free_root()
+      root		Memory root
+      MyFlags		Flags for what should be freed:
+
+        MY_MARK_BLOCKS_FREED	Don't free blocks, just mark them free
+        MY_KEEP_PREALLOC	If this is not set, then free also the
+        		        preallocated block
+
+  NOTES
+    One can call this function either with root block initialised with
+    init_alloc_root() or with a bzero()-ed block.
+    It's also safe to call this multiple times with the same mem_root.
+*/
+
+void free_root(MEM_ROOT *root, myf MyFlags)
+{
+  reg1 USED_MEM *next,*old;
+  DBUG_ENTER("free_root");
+  DBUG_PRINT("enter",("root: %p  flags: %lu", root, MyFlags));
+
+#if !(defined(HAVE_valgrind) && defined(EXTRA_DEBUG))
+  /*
+    There is no point in using mark_blocks_free when using valgrind as
+    it will not reclaim any memory
+  */
+  if (MyFlags & MY_MARK_BLOCKS_FREE)
+  {
+    mark_blocks_free(root);
+    DBUG_VOID_RETURN;
+  }
+#endif
+  if (!(MyFlags & MY_KEEP_PREALLOC))
+    root->pre_alloc=0;
+
+  for (next=root->used; next ;)
+  {
+    old=next; next= next->next ;
+    if (old != root->pre_alloc)
+      my_free(old);
+  }
+  for (next=root->free ; next ;)
+  {
+    old=next; next= next->next;
+    if (old != root->pre_alloc)
+      my_free(old);
+  }
+  root->used=root->free=0;
+  if (root->pre_alloc)
+  {
+    root->free=root->pre_alloc;
+    root->free->left=root->pre_alloc->size-ALIGN_SIZE(sizeof(USED_MEM));
+    TRASH_MEM(root->pre_alloc);
+    root->free->next=0;
+  }
+  root->block_num= 4;
+  root->first_block_usage= 0;
+  DBUG_VOID_RETURN;
+}
+
+/*
+  Find block that contains an object and set the pre_alloc to it
+*/
+
+void set_prealloc_root(MEM_ROOT *root, char *ptr)
+{
+  USED_MEM *next;
+  for (next=root->used; next ; next=next->next)
+  {
+    if ((char*) next <= ptr && (char*) next + next->size > ptr)
+    {
+      root->pre_alloc=next;
+      return;
+    }
+  }
+  for (next=root->free ; next ; next=next->next)
+  {
+    if ((char*) next <= ptr && (char*) next + next->size > ptr)
+    {
+      root->pre_alloc=next;
+      return;
+    }
+  }
+}
+
+
+char *strdup_root(MEM_ROOT *root, const char *str)
+{
+  return strmake_root(root, str, strlen(str));
+}
+
+
+char *strmake_root(MEM_ROOT *root, const char *str, size_t len)
+{
+  char *pos;
+  if ((pos=alloc_root(root,len+1)))
+  {
+    if (len)
+      memcpy(pos,str,len);
+    pos[len]=0;
+  }
+  return pos;
+}
+
+
+void *memdup_root(MEM_ROOT *root, const void *str, size_t len)
+{
+  char *pos;
+  if ((pos=alloc_root(root,len)) && len)
+    memcpy(pos,str,len);
+  return pos;
+}
+
+LEX_CSTRING safe_lexcstrdup_root(MEM_ROOT *root, const LEX_CSTRING str)
+{
+  LEX_CSTRING res;
+  if (str.length)
+    res.str= strmake_root(root, str.str, str.length);
+  else
+    res.str= (const char *)"";
+  res.length= str.length;
+  return res;
+}