1 files changed, 62 insertions, 0 deletions
diff --git a/elff/elf_alloc.cc b/elff/elf_alloc.cc
new file mode 100644
index 0000000..10d740b
--- /dev/null
+++ b/elff/elf_alloc.cc
@@ -0,0 +1,62 @@
+/* Copyright (C) 2007-2010 The Android Open Source Project
+**
+** This software is licensed under the terms of the GNU General Public
+** License version 2, as published by the Free Software Foundation, and
+** may be copied, distributed, and modified under those terms.
+**
+** 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.
+*/
+
+/*
+ * Contains implementation of class ElfAllocator, that implements memory
+ * allocations for DWARF objects.
+ */
+
+#include "elf_alloc.h"
+#include "elf_file.h"
+
+ElfAllocator::ElfAllocator()
+    : current_chunk_(NULL) {
+}
+
+ElfAllocator::~ElfAllocator() {
+  ElfAllocatorChunk* chunk_to_free = current_chunk_;
+  while (chunk_to_free != NULL) {
+    ElfAllocatorChunk* next_chunk = chunk_to_free->prev;
+    free(chunk_to_free);
+    chunk_to_free = next_chunk;
+  }
+}
+
+void* ElfAllocator::alloc(size_t size) {
+  /* Lets keep everyting properly aligned. */
+  size = (size + ELFALLOC_ALIGNMENT_MASK) & ~ELFALLOC_ALIGNMENT_MASK;
+
+  if (current_chunk_ == NULL || current_chunk_->remains < size) {
+    /* Allocate new chunk. */
+    ElfAllocatorChunk* new_chunk =
+        reinterpret_cast<ElfAllocatorChunk*>(malloc(ELF_ALLOC_CHUNK_SIZE));
+    assert(new_chunk != NULL);
+    if (new_chunk == NULL) {
+      _set_errno(ENOMEM);
+      return NULL;
+    }
+    new_chunk->size = ELF_ALLOC_CHUNK_SIZE;
+    new_chunk->avail = INC_PTR(new_chunk, sizeof(ElfAllocatorChunk));
+    new_chunk->remains = new_chunk->size - sizeof(ElfAllocatorChunk);
+    new_chunk->prev = current_chunk_;
+    current_chunk_ = new_chunk;
+  }
+
+  void* ret = current_chunk_->avail;
+  current_chunk_->remains -= size;
+  current_chunk_->avail = INC_PTR(current_chunk_->avail, size);
+  return ret;
+}
+
+void* DwarfAllocBase::operator new(size_t size, const ElfFile* elf) {
+  return elf->allocator()->alloc(size);
+}