From 76d85a10f6cda93eba29dad5372e8160af7289c8 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Wed, 27 Feb 2019 22:26:35 +0100
Subject: Use multiple threads to parse

---
 src/std/scoped_allocator.c | 102 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 src/std/scoped_allocator.c

(limited to 'src/std/scoped_allocator.c')

diff --git a/src/std/scoped_allocator.c b/src/std/scoped_allocator.c
new file mode 100644
index 0000000..d53edad
--- /dev/null
+++ b/src/std/scoped_allocator.c
@@ -0,0 +1,102 @@
+#include "../../include/std/scoped_allocator.h"
+#include "../../include/std/alloc.h"
+#include <assert.h>
+
+#define ALLOC_NODE_SIZE 4096
+
+int scoped_allocator_node_init(ScopedAllocatorNode *self) {
+    self->data = NULL;
+    self->size = 0;
+    self->next = NULL;
+    return am_malloc(ALLOC_NODE_SIZE, (void**)&self->data);
+}
+
+void scoped_allocator_node_deinit(ScopedAllocatorNode *self) {
+    am_free(self->data);
+    self->data = NULL;
+    self->size = 0;
+    if(self->next) {
+        scoped_allocator_node_deinit(self->next);
+        am_free(self->next);
+        self->next = NULL;
+    }
+}
+
+int scoped_allocator_init(ScopedAllocator *self) {
+    return_if_error(scoped_allocator_node_init(&self->head));
+    self->current = &self->head;
+    return buffer_init(&self->buffers, NULL);
+}
+
+static void buffer_deinit(Buffer *self) {
+    am_free(self->data);
+    self->data = NULL;
+    self->size = 0;
+    self->capacity = 0;
+}
+
+void scoped_allocator_deinit(ScopedAllocator *self) {
+    Buffer *buffer;
+    Buffer *buffer_end;
+
+    scoped_allocator_node_deinit(&self->head);
+    self->current = NULL;
+    buffer = (Buffer*)self->buffers.data;
+    buffer_end = buffer + self->buffers.size / sizeof(Buffer);
+    while(buffer != buffer_end) {
+        buffer_deinit(buffer);
+        ++buffer;
+    }
+    buffer_deinit(&self->buffers);
+}
+
+static CHECK_RESULT int scoped_allocator_ensure_capacity_for(ScopedAllocator *self, usize size) {
+    void *new_node;
+    new_node = NULL;
+    
+    if(self->current->size + size > ALLOC_NODE_SIZE) {
+        return_if_error(am_malloc(sizeof(ScopedAllocatorNode), &new_node));
+        cleanup_if_error(scoped_allocator_node_init(new_node));
+        self->current->next = new_node;
+        self->current = new_node;
+    }
+    return ALLOC_OK;
+
+    cleanup:
+    if(new_node)
+        am_free(new_node);
+    return ALLOC_FAIL;
+}
+
+static void* align_ptr_ceil(void *ptr, uintptr_t alignment) {
+    uintptr_t ptrval;
+    ptrval = (uintptr_t)ptr;
+    return (void*)((ptrval + alignment + 1) & ~(alignment - 1));
+}
+
+static usize align_ptr_ceil_offset(void *ptr, uintptr_t alignment) {
+    return (uintptr_t)align_ptr_ceil(ptr, alignment) - (uintptr_t)ptr;
+}
+
+int scoped_allocator_alloc(ScopedAllocator *self, usize size, void **mem) {
+    ScopedAllocatorNode *current;
+    usize alloc_size;
+    assert(self->current);
+    assert(size <= ALLOC_NODE_SIZE);
+    current = self->current;
+
+    alloc_size = size + align_ptr_ceil_offset(self->current->data + self->current->size, 16);
+    return_if_error(scoped_allocator_ensure_capacity_for(self, alloc_size));
+    /* Reallocated (new node created) */
+    if(self->current != current) {
+        *mem = self->current->data;
+    } else {
+        *mem = align_ptr_ceil(self->current->data + self->current->size, 16);
+    }
+    self->current->size = size;
+    return 0;
+}
+
+int scoped_allocator_add_buffer(ScopedAllocator *self, Buffer *buffer) {
+    return buffer_append(&self->buffers, buffer, sizeof(Buffer));
+}
\ No newline at end of file
-- 
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