mirror of
https://github.com/kanaka/mal.git
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36 lines
1.4 KiB
Zig
36 lines
1.4 KiB
Zig
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const std = @import("std");
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const Allocator = std.mem.Allocator;
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const warn = @import("std").debug.warn;
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pub const LoggingAllocator = struct {
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allocator: Allocator,
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parent_allocator: *Allocator,
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const Self = @This();
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pub fn init(parent_allocator: *Allocator) Self {
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return Self {
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.allocator = Allocator{
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.reallocFn = realloc,
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.shrinkFn = shrink,
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},
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.parent_allocator = parent_allocator,
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};
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}
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fn realloc(allocator: *Allocator, old_mem: []u8, old_align: u29, new_size: usize, new_align: u29) ![]u8 {
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warn("mem new {} {} {}\n", old_mem.len, new_size, @intCast(i64,new_size) - @intCast(i64, old_mem.len));
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const self = @fieldParentPtr(Self, "allocator", allocator);
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const result = self.parent_allocator.reallocFn(self.parent_allocator, old_mem, old_align, new_size, new_align);
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return result;
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}
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fn shrink(allocator: *Allocator, old_mem: []u8, old_align: u29, new_size: usize, new_align: u29) []u8 {
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warn("mem del {} {} {}\n", old_mem.len, new_size, @intCast(i64,new_size) - @intCast(i64,old_mem.len));
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warn("deleted: {}\n", old_mem);
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const self = @fieldParentPtr(Self, "allocator", allocator);
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const result = self.parent_allocator.shrinkFn(self.parent_allocator, old_mem, old_align, new_size, new_align);
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return result;
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}
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};
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