rawCAlloc
Function parameters
Parameters
Type definitions in this namespace
Types
- GeneralPurposeAllocatorConfig
- Deprecated; to be removed after 0.14.0 is tagged.
Functions in this namespace
Functions
- GeneralPurposeAllocator
- Deprecated; to be removed after 0.14.0 is tagged.
- pageSize
- If the page size is comptime-known, return value is comptime.
- defaultQueryPageSize
- The default implementation of `std.options.queryPageSize`.
- stackFallback
- Returns a `StackFallbackAllocator` allocating using either a
- StackFallbackAllocator
- An allocator that attempts to allocate using a
- testAllocator
- This one should not try alignments that exceed what C malloc can handle.
TODO Utilize this on Windows.
Values
- next_mmap_addr_hint
- TODO Utilize this on Windows.
- page_size_min
- comptime-known minimum page size of the target.
- page_size_max
- comptime-known maximum page size of the target.
- c_allocator
- Supports the full Allocator interface, including alignment, and exploiting
- raw_c_allocator
- Asserts allocations are within `@alignOf(std.c.max_align_t)` and directly
- page_allocator
- On operating systems that support memory mapping, this allocator makes a
- smp_allocator
- = .{ .ptr = undefined, .vtable = &SmpAllocator.vtable, }
- wasm_allocator
- This allocator is fast, small, and specific to WebAssembly.
Source
Implementation
fn rawCAlloc(
context: *anyopaque,
len: usize,
alignment: Alignment,
return_address: usize,
) ?[*]u8 {
_ = context;
_ = return_address;
assert(alignment.compare(.lte, .of(std.c.max_align_t)));
// Note that this pointer cannot be aligncasted to max_align_t because if
// len is < max_align_t then the alignment can be smaller. For example, if
// max_align_t is 16, but the user requests 8 bytes, there is no built-in
// type in C that is size 8 and has 16 byte alignment, so the alignment may
// be 8 bytes rather than 16. Similarly if only 1 byte is requested, malloc
// is allowed to return a 1-byte aligned pointer.
return @ptrCast(c.malloc(len));
}