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macho: handle majority of DW_FORM_ values for DWARF4 in the linker

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This commit is contained in:
Jakub Konka 2022-10-23 16:29:08 +02:00
parent 04472af328
commit 828735ac03
1 changed files with 42 additions and 16 deletions
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58
src/link/MachO/DwarfInfo.zig
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@ -63,7 +63,6 @@ pub fn genSubprogramLookupByName(
while (try attr_it.next()) |attr| switch (attr.name) {
dwarf.AT.name => if (attr.getString(self, compile_unit.cuh)) |str| {
log.warn("subprogram: {s}", .{str});
name = str;
},
dwarf.AT.low_pc => {
@ -389,8 +388,11 @@ fn findFormSize(self: DwarfInfo, form: u64, di_off: usize, cuh: CompileUnit.Head
const reader = creader.reader();
switch (form) {
dwarf.FORM.strp => return if (cuh.is_64bit) @sizeOf(u64) else @sizeOf(u32),
dwarf.FORM.sec_offset => return if (cuh.is_64bit) @sizeOf(u64) else @sizeOf(u32),
dwarf.FORM.strp,
dwarf.FORM.sec_offset,
dwarf.FORM.ref_addr,
=> return if (cuh.is_64bit) @sizeOf(u64) else @sizeOf(u32),
dwarf.FORM.addr => return cuh.address_size,
dwarf.FORM.exprloc => {
const expr_len = try leb.readULEB128(u64, reader);
@ -402,29 +404,53 @@ fn findFormSize(self: DwarfInfo, form: u64, di_off: usize, cuh: CompileUnit.Head
},
dwarf.FORM.flag_present => return 0,
dwarf.FORM.data1 => return @sizeOf(u8),
dwarf.FORM.data2 => return @sizeOf(u16),
dwarf.FORM.data4 => return @sizeOf(u32),
dwarf.FORM.data8 => return @sizeOf(u64),
dwarf.FORM.udata => {
dwarf.FORM.data1,
dwarf.FORM.ref1,
dwarf.FORM.block1,
dwarf.FORM.flag,
=> return @sizeOf(u8),
dwarf.FORM.data2,
dwarf.FORM.ref2,
dwarf.FORM.block2,
=> return @sizeOf(u16),
dwarf.FORM.data4,
dwarf.FORM.ref4,
dwarf.FORM.block4,
=> return @sizeOf(u32),
dwarf.FORM.data8,
dwarf.FORM.ref8,
dwarf.FORM.ref_sig8,
=> return @sizeOf(u64),
dwarf.FORM.udata,
dwarf.FORM.ref_udata,
dwarf.FORM.block,
=> {
_ = try leb.readULEB128(u64, reader);
return math.cast(usize, creader.bytes_read) orelse error.Overflow;
},
dwarf.FORM.sdata => {
_ = try leb.readILEB128(i64, reader);
return math.cast(usize, creader.bytes_read) orelse error.Overflow;
},
dwarf.FORM.ref1 => return @sizeOf(u8),
dwarf.FORM.ref2 => return @sizeOf(u16),
dwarf.FORM.ref4 => return @sizeOf(u32),
dwarf.FORM.ref8 => return @sizeOf(u64),
dwarf.FORM.ref_udata => {
_ = try leb.readULEB128(u64, reader);
return math.cast(usize, creader.bytes_read) orelse error.Overflow;
dwarf.FORM.string => {
var count: usize = 0;
while (true) : (count += 1) {
const byte = try reader.readByte();
if (byte == 0x0) break;
}
return count;
},
else => return error.ToDo,
else => {
log.err("unhandled DW_FORM_* value with identifier {x}", .{form});
return error.UnhandledDwFormValue;
},
}
}