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terminal: add helpers to BitmapAllocator for sizing

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This commit is contained in:
Mitchell Hashimoto
2026-01-29 10:23:54 -08:00
parent 9b75f4a799
commit 51ce210833
2 changed files with 21 additions and 20 deletions
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27
src/inspector/widgets/page.zig
View File

@@ -149,26 +149,13 @@ pub fn managedMemory(page: *const Page) void {
_ = cimgui.c.ImGui_TableSetColumnIndex(2);
cimgui.c.ImGui_Text("%d", page.graphemeCapacity());
{
const StringAlloc = @TypeOf(page.string_alloc);
const string_chunk = StringAlloc.bytesRequired(u8, 1);
const string_total_chunks = page.string_alloc.bitmap_count * StringAlloc.bitmap_bit_size;
var string_free_chunks: usize = 0;
const string_bitmaps = page.string_alloc.bitmap.ptr(page.memory);
for (string_bitmaps[0..page.string_alloc.bitmap_count]) |bitmap| {
string_free_chunks += @popCount(bitmap);
}
const string_used_chunks = string_total_chunks - string_free_chunks;
const string_used_bytes = string_used_chunks * string_chunk;
const string_capacity_bytes = string_total_chunks * string_chunk;
cimgui.c.ImGui_TableNextRow();
_ = cimgui.c.ImGui_TableSetColumnIndex(0);
cimgui.c.ImGui_Text("Strings (bytes)");
_ = cimgui.c.ImGui_TableSetColumnIndex(1);
cimgui.c.ImGui_Text("%d", string_used_bytes);
_ = cimgui.c.ImGui_TableSetColumnIndex(2);
cimgui.c.ImGui_Text("%d", string_capacity_bytes);
}
cimgui.c.ImGui_TableNextRow();
_ = cimgui.c.ImGui_TableSetColumnIndex(0);
cimgui.c.ImGui_Text("Strings (bytes)");
_ = cimgui.c.ImGui_TableSetColumnIndex(1);
cimgui.c.ImGui_Text("%d", page.string_alloc.usedBytes(page.memory));
_ = cimgui.c.ImGui_TableSetColumnIndex(2);
cimgui.c.ImGui_Text("%d", page.string_alloc.capacityBytes());
{
const hyperlink_map = page.hyperlink_map.map(page.memory);

14
src/terminal/bitmap_allocator.zig
View File

@@ -147,6 +147,20 @@ pub fn BitmapAllocator(comptime chunk_size: comptime_int) type {
}
}
/// Returns the total capacity in bytes.
pub fn capacityBytes(self: Self) usize {
return self.bitmap_count * bitmap_bit_size * chunk_size;
}
/// Returns the number of bytes currently in use.
pub fn usedBytes(self: Self, base: anytype) usize {
const bitmaps = self.bitmap.ptr(base);
var free_chunks: usize = 0;
for (bitmaps[0..self.bitmap_count]) |bitmap| free_chunks += @popCount(bitmap);
const total_chunks = self.bitmap_count * bitmap_bit_size;
return (total_chunks - free_chunks) * chunk_size;
}
/// For testing only.
fn isAllocated(self: *Self, base: anytype, slice: anytype) bool {
comptime assert(@import("builtin").is_test);