Commit eb21b20949c8760ab1d992d584c44ae320e91f80 | zig

author	Jakub Konka <kubkon@jakubkonka.com> 2022-11-09 06:53:24+01:00
committer	Andrew Kelley <andrew@ziglang.org> 2023-01-09 13:55:25-07:00
log	eb21b20949c8760ab1d992d584c44ae320e91f80
tree	1716cbc408d37aa7d9a1497c72c0776423fc4e60
parent	4efb197f90f60efc253f242463538de573d54e72

Merge pull request #13487 from ziglang/zld-dwarf-string

macho: misc DWARF parser fixes

1 files changed, 36 insertions(+), 11 deletions(-)

src
- link
  - MachO
    DwarfInfo.zig

src/link/MachO/DwarfInfo.zig+36-11

...	...	@@ -257,13 +257,21 @@ pub const Attribute = struct {
257	257	}
258	258
259	259	pub fn getString(self: Attribute, ctx: DwarfInfo, cuh: CompileUnit.Header) ?[]const u8 {
260		if (self.form != dwarf.FORM.strp) return null;
261	260	const debug_info = self.getDebugInfo(ctx);
262		const off = if (cuh.is_64bit)
263		mem.readIntLittle(u64, debug_info[0..8])
264		else
265		mem.readIntLittle(u32, debug_info[0..4]);
266		return ctx.getString(off);
	261
	262	switch (self.form) {
	263	dwarf.FORM.string => {
	264	return mem.sliceTo(@ptrCast([*:0]const u8, debug_info.ptr), 0);
	265	},
	266	dwarf.FORM.strp => {
	267	const off = if (cuh.is_64bit)
	268	mem.readIntLittle(u64, debug_info[0..8])
	269	else
	270	mem.readIntLittle(u32, debug_info[0..4]);
	271	return ctx.getString(off);
	272	},
	273	else => return null,
	274	}
267	275	}
268	276
269	277	pub fn getConstant(self: Attribute, ctx: DwarfInfo) !?i128 {
...	...	@@ -394,6 +402,26 @@ fn findFormSize(self: DwarfInfo, form: u64, di_off: usize, cuh: CompileUnit.Head
394	402	=> return if (cuh.is_64bit) @sizeOf(u64) else @sizeOf(u32),
395	403
396	404	dwarf.FORM.addr => return cuh.address_size,
	405
	406	dwarf.FORM.block1,
	407	dwarf.FORM.block2,
	408	dwarf.FORM.block4,
	409	dwarf.FORM.block,
	410	=> {
	411	const len: u64 = switch (form) {
	412	dwarf.FORM.block1 => try reader.readIntLittle(u8),
	413	dwarf.FORM.block2 => try reader.readIntLittle(u16),
	414	dwarf.FORM.block4 => try reader.readIntLittle(u32),
	415	dwarf.FORM.block => try leb.readULEB128(u64, reader),
	416	else => unreachable,
	417	};
	418	var i: u64 = 0;
	419	while (i < len) : (i += 1) {
	420	_ = try reader.readByte();
	421	}
	422	return math.cast(usize, creader.bytes_read) orelse error.Overflow;
	423	},
	424
397	425	dwarf.FORM.exprloc => {
398	426	const expr_len = try leb.readULEB128(u64, reader);
399	427	var i: u64 = 0;
...	...	@@ -406,18 +434,15 @@ fn findFormSize(self: DwarfInfo, form: u64, di_off: usize, cuh: CompileUnit.Head
406	434
407	435	dwarf.FORM.data1,
408	436	dwarf.FORM.ref1,
409		dwarf.FORM.block1,
410	437	dwarf.FORM.flag,
411	438	=> return @sizeOf(u8),
412	439
413	440	dwarf.FORM.data2,
414	441	dwarf.FORM.ref2,
415		dwarf.FORM.block2,
416	442	=> return @sizeOf(u16),
417	443
418	444	dwarf.FORM.data4,
419	445	dwarf.FORM.ref4,
420		dwarf.FORM.block4,
421	446	=> return @sizeOf(u32),
422	447
423	448	dwarf.FORM.data8,
...	...	@@ -427,7 +452,6 @@ fn findFormSize(self: DwarfInfo, form: u64, di_off: usize, cuh: CompileUnit.Head
427	452
428	453	dwarf.FORM.udata,
429	454	dwarf.FORM.ref_udata,
430		dwarf.FORM.block,
431	455	=> {
432	456	_ = try leb.readULEB128(u64, reader);
433	457	return math.cast(usize, creader.bytes_read) orelse error.Overflow;
...	...	@@ -440,8 +464,9 @@ fn findFormSize(self: DwarfInfo, form: u64, di_off: usize, cuh: CompileUnit.Head
440	464
441	465	dwarf.FORM.string => {
442	466	var count: usize = 0;
443		while (true) : (count += 1) {
	467	while (true) {
444	468	const byte = try reader.readByte();
	469	count += 1;
445	470	if (byte == 0x0) break;
446	471	}
447	472	return count;