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std.debug: improve the APIs and stuff

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mlugg 2025-09-05 19:43:08 +01:00
parent d4f710791f
commit 5709369d05
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GPG key ID: 3F5B7DCCBF4AF02E
4 changed files with 457 additions and 676 deletions
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1108
lib/std/debug.zig
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2
lib/std/debug/Dwarf.zig
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@ -1449,7 +1449,7 @@ fn getStringGeneric(opt_str: ?[]const u8, offset: u64) ![:0]const u8 {
pub fn getSymbol(di: *Dwarf, allocator: Allocator, endian: Endian, address: u64) !std.debug.Symbol {
const compile_unit = di.findCompileUnit(endian, address) catch |err| switch (err) {
error.MissingDebugInfo, error.InvalidDebugInfo => return .{ .name = null, .compile_unit_name = null, .source_location = null },
error.MissingDebugInfo, error.InvalidDebugInfo => return .unknown,
else => return err,
};
return .{

17
lib/std/debug/SelfInfo.zig
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@ -158,7 +158,7 @@ test {
}
pub const UnwindContext = struct {
gpa: Allocator,
gpa: Allocator, // MLUGG TODO: make unmanaged (also maybe rename this type, DwarfUnwindContext or smth idk)
cfa: ?usize,
pc: usize,
thread_context: *std.debug.ThreadContext,
@ -166,22 +166,20 @@ pub const UnwindContext = struct {
vm: Dwarf.Unwind.VirtualMachine,
stack_machine: Dwarf.expression.StackMachine(.{ .call_frame_context = true }),
pub fn init(gpa: Allocator, thread_context: *std.debug.ThreadContext) !UnwindContext {
pub fn init(gpa: Allocator, thread_context: *std.debug.ThreadContext) UnwindContext {
comptime assert(supports_unwinding);
const ip_reg_num = Dwarf.abi.ipRegNum(native_arch).?;
const pc = stripInstructionPtrAuthCode(
(try regValueNative(thread_context, ip_reg_num, null)).*,
);
const context_copy = try gpa.create(std.debug.ThreadContext);
std.debug.copyContext(thread_context, context_copy);
const raw_pc_ptr = regValueNative(thread_context, ip_reg_num, null) catch {
unreachable; // error means unsupported, in which case `supports_unwinding` should have been `false`
};
const pc = stripInstructionPtrAuthCode(raw_pc_ptr.*);
return .{
.gpa = gpa,
.cfa = null,
.pc = pc,
.thread_context = context_copy,
.thread_context = thread_context,
.reg_context = undefined,
.vm = .{},
.stack_machine = .{},
@ -191,7 +189,6 @@ pub const UnwindContext = struct {
pub fn deinit(self: *UnwindContext) void {
self.vm.deinit(self.gpa);
self.stack_machine.deinit(self.gpa);
self.gpa.destroy(self.thread_context);
self.* = undefined;
}

6
lib/std/debug/SelfInfo/DarwinModule.zig
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@ -196,11 +196,7 @@ pub fn getSymbolAtAddress(module: *const DarwinModule, gpa: Allocator, di: *Debu
const full = &di.full.?;
const vaddr = address - module.load_offset;
const symbol = MachoSymbol.find(full.symbols, vaddr) orelse return .{
.name = null,
.compile_unit_name = null,
.source_location = null,
};
const symbol = MachoSymbol.find(full.symbols, vaddr) orelse return .unknown;
// offset of `address` from start of `symbol`
const address_symbol_offset = vaddr - symbol.addr;