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dwarf: refactor object file format and ptr width switches in writeDbgLineHeader

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This commit is contained in:
Jakub Konka
2022-12-07 22:41:22 +01:00
parent 8e71a79e4b
commit be2b85f670
1 changed files with 29 additions and 16 deletions
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45
src/link/Dwarf.zig
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@@ -2306,15 +2306,19 @@ pub fn writeDbgLineHeader(self: *Dwarf, module: *Module) !void {
// not including the initial length itself.
const after_init_len = di_buf.items.len + init_len_size;
const init_len = dbg_line_prg_end - after_init_len;
if (self.bin_file.tag == .macho) {
mem.writeIntLittle(u32, di_buf.addManyAsArrayAssumeCapacity(4), @intCast(u32, init_len));
} else switch (self.ptr_width) {
.p32 => {
mem.writeInt(u32, di_buf.addManyAsArrayAssumeCapacity(4), @intCast(u32, init_len), target_endian);
switch (self.bin_file.tag) {
.macho => {
mem.writeIntLittle(u32, di_buf.addManyAsArrayAssumeCapacity(4), @intCast(u32, init_len));
},
.p64 => {
di_buf.appendNTimesAssumeCapacity(0xff, 4);
mem.writeInt(u64, di_buf.addManyAsArrayAssumeCapacity(8), init_len, target_endian);
else => switch (self.ptr_width) {
.p32 => {
mem.writeInt(u32, di_buf.addManyAsArrayAssumeCapacity(4), @intCast(u32, init_len), target_endian);
},
.p64 => {
di_buf.appendNTimesAssumeCapacity(0xff, 4);
mem.writeInt(u64, di_buf.addManyAsArrayAssumeCapacity(8), init_len, target_endian);
},
},
}
@@ -2325,7 +2329,12 @@ pub fn writeDbgLineHeader(self: *Dwarf, module: *Module) !void {
// Therefore we rely on the NOP jump at the beginning of the Line Number Program for
// padding rather than this field.
const before_header_len = di_buf.items.len;
di_buf.items.len += if (self.bin_file.tag == .macho) @sizeOf(u32) else ptr_width_bytes; // We will come back and write this.
di_buf.items.len += switch (self.bin_file.tag) { // We will come back and write this.
.macho => @sizeOf(u32),
else => ptr_width_bytes,
};
const after_header_len = di_buf.items.len;
const opcode_base = DW.LNS.set_isa + 1;
@@ -2374,14 +2383,18 @@ pub fn writeDbgLineHeader(self: *Dwarf, module: *Module) !void {
di_buf.appendAssumeCapacity(0); // file names sentinel
const header_len = di_buf.items.len - after_header_len;
if (self.bin_file.tag == .macho) {
mem.writeIntLittle(u32, di_buf.items[before_header_len..][0..4], @intCast(u32, header_len));
} else switch (self.ptr_width) {
.p32 => {
mem.writeInt(u32, di_buf.items[before_header_len..][0..4], @intCast(u32, header_len), target_endian);
switch (self.bin_file.tag) {
.macho => {
mem.writeIntLittle(u32, di_buf.items[before_header_len..][0..4], @intCast(u32, header_len));
},
.p64 => {
mem.writeInt(u64, di_buf.items[before_header_len..][0..8], header_len, target_endian);
else => switch (self.ptr_width) {
.p32 => {
mem.writeInt(u32, di_buf.items[before_header_len..][0..4], @intCast(u32, header_len), target_endian);
},
.p64 => {
mem.writeInt(u64, di_buf.items[before_header_len..][0..8], header_len, target_endian);
},
},
}