54 lines
2.1 KiB
Zig
54 lines
2.1 KiB
Zig
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const std = @import("../std.zig");
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const Allocator = std.mem.Allocator;
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const AnyErrorOutStream = std.io.OutStream(anyerror);
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/// This allocator is used in front of another allocator and logs to the provided stream
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/// on every call to the allocator. Stream errors are ignored.
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/// If https://github.com/ziglang/zig/issues/2586 is implemented, this API can be improved.
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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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out_stream: *AnyErrorOutStream,
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const Self = @This();
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pub fn init(parent_allocator: *Allocator, out_stream: *AnyErrorOutStream) 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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.out_stream = out_stream,
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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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const self = @fieldParentPtr(Self, "allocator", allocator);
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if (old_mem.len == 0) {
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self.out_stream.print("allocation of {} ", new_size) catch {};
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} else {
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self.out_stream.print("resize from {} to {} ", old_mem.len, new_size) catch {};
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}
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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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if (result) |buff| {
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self.out_stream.print("success!\n") catch {};
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} else |err| {
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self.out_stream.print("failure!\n") catch {};
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}
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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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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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if (new_size == 0) {
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self.out_stream.print("free of {} bytes success!\n", old_mem.len) catch {};
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} else {
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self.out_stream.print("shrink from {} bytes to {} bytes success!\n", old_mem.len, new_size) catch {};
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}
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return result;
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}
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};
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