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coff: move Symtab and Strtab out of coff.Coff
This should ease interfacing with different std.coff functionalities.
This commit is contained in:
Jakub Konka
parent
7ef0c9d298
commit
aa5568beb6
1 changed files with 121 additions and 121 deletions
242
lib/std/coff.zig
242
lib/std/coff.zig
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@ -1100,132 +1100,132 @@ pub const Coff = struct {
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mem.copy(u8, out_buff, self.data[sec.pointer_to_raw_data..][0..sec.virtual_size]);
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return out_buff;
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}
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};
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pub const Symtab = struct {
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pub const Symtab = struct {
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buffer: []const u8,
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pub fn len(self: Symtab) usize {
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return @divExact(self.buffer.len, Symbol.sizeOf());
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}
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pub const Tag = enum {
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symbol,
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func_def,
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debug_info,
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weak_ext,
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file_def,
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sect_def,
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};
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pub const Record = union(Tag) {
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symbol: Symbol,
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debug_info: DebugInfoDefinition,
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func_def: FunctionDefinition,
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weak_ext: WeakExternalDefinition,
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file_def: FileDefinition,
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sect_def: SectionDefinition,
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};
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/// Lives as long as Symtab instance.
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pub fn at(self: Symtab, index: usize, tag: Tag) Record {
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const offset = index * Symbol.sizeOf();
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const raw = self.buffer[offset..][0..Symbol.sizeOf()];
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return switch (tag) {
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.symbol => .{ .symbol = asSymbol(raw) },
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.debug_info => .{ .debug_info = asDebugInfo(raw) },
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.func_def => .{ .func_def = asFuncDef(raw) },
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.weak_ext => .{ .weak_ext = asWeakExtDef(raw) },
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.file_def => .{ .file_def = asFileDef(raw) },
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.sect_def => .{ .sect_def = asSectDef(raw) },
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};
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}
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fn asSymbol(raw: []const u8) Symbol {
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return .{
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.name = raw[0..8].*,
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.value = mem.readIntLittle(u32, raw[8..12]),
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.section_number = @intToEnum(SectionNumber, mem.readIntLittle(u16, raw[12..14])),
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.@"type" = @bitCast(SymType, mem.readIntLittle(u16, raw[14..16])),
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.storage_class = @intToEnum(StorageClass, raw[16]),
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.number_of_aux_symbols = raw[17],
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};
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}
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fn asDebugInfo(raw: []const u8) DebugInfoDefinition {
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return .{
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.unused_1 = raw[0..4].*,
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.linenumber = mem.readIntLittle(u16, raw[4..6]),
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.unused_2 = raw[6..12].*,
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.pointer_to_next_function = mem.readIntLittle(u32, raw[12..16]),
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.unused_3 = raw[16..18].*,
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};
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}
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fn asFuncDef(raw: []const u8) FunctionDefinition {
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return .{
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.tag_index = mem.readIntLittle(u32, raw[0..4]),
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.total_size = mem.readIntLittle(u32, raw[4..8]),
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.pointer_to_linenumber = mem.readIntLittle(u32, raw[8..12]),
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.pointer_to_next_function = mem.readIntLittle(u32, raw[12..16]),
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.unused = raw[16..18].*,
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};
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}
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fn asWeakExtDef(raw: []const u8) WeakExternalDefinition {
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return .{
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.tag_index = mem.readIntLittle(u32, raw[0..4]),
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.flag = @intToEnum(WeakExternalFlag, mem.readIntLittle(u32, raw[4..8])),
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.unused = raw[8..18].*,
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};
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}
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fn asFileDef(raw: []const u8) FileDefinition {
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return .{
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.file_name = raw[0..18].*,
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};
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}
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fn asSectDef(raw: []const u8) SectionDefinition {
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return .{
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.length = mem.readIntLittle(u32, raw[0..4]),
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.number_of_relocations = mem.readIntLittle(u16, raw[4..6]),
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.number_of_linenumbers = mem.readIntLittle(u16, raw[6..8]),
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.checksum = mem.readIntLittle(u32, raw[8..12]),
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.number = mem.readIntLittle(u16, raw[12..14]),
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.selection = @intToEnum(ComdatSelection, raw[14]),
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.unused = raw[15..18].*,
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};
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}
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pub const Slice = struct {
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buffer: []const u8,
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fn len(self: Symtab) usize {
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return @divExact(self.buffer.len, Symbol.sizeOf());
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}
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const Tag = enum {
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symbol,
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func_def,
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debug_info,
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weak_ext,
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file_def,
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sect_def,
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};
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const Record = union(Tag) {
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symbol: Symbol,
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debug_info: DebugInfoDefinition,
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func_def: FunctionDefinition,
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weak_ext: WeakExternalDefinition,
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file_def: FileDefinition,
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sect_def: SectionDefinition,
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};
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num: usize,
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count: usize = 0,
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/// Lives as long as Symtab instance.
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fn at(self: Symtab, index: usize, tag: Tag) Record {
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const offset = index * Symbol.sizeOf();
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const raw = self.buffer[offset..][0..Symbol.sizeOf()];
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return switch (tag) {
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.symbol => .{ .symbol = asSymbol(raw) },
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.debug_info => .{ .debug_info = asDebugInfo(raw) },
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.func_def => .{ .func_def = asFuncDef(raw) },
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.weak_ext => .{ .weak_ext = asWeakExtDef(raw) },
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.file_def => .{ .file_def = asFileDef(raw) },
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.sect_def => .{ .sect_def = asSectDef(raw) },
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};
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}
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fn asSymbol(raw: []const u8) Symbol {
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return .{
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.name = raw[0..8].*,
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.value = mem.readIntLittle(u32, raw[8..12]),
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.section_number = @intToEnum(SectionNumber, mem.readIntLittle(u16, raw[12..14])),
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.@"type" = @bitCast(SymType, mem.readIntLittle(u16, raw[14..16])),
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.storage_class = @intToEnum(StorageClass, raw[16]),
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.number_of_aux_symbols = raw[17],
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};
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}
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fn asDebugInfo(raw: []const u8) DebugInfoDefinition {
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return .{
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.unused_1 = raw[0..4].*,
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.linenumber = mem.readIntLittle(u16, raw[4..6]),
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.unused_2 = raw[6..12].*,
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.pointer_to_next_function = mem.readIntLittle(u32, raw[12..16]),
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.unused_3 = raw[16..18].*,
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};
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}
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fn asFuncDef(raw: []const u8) FunctionDefinition {
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return .{
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.tag_index = mem.readIntLittle(u32, raw[0..4]),
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.total_size = mem.readIntLittle(u32, raw[4..8]),
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.pointer_to_linenumber = mem.readIntLittle(u32, raw[8..12]),
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.pointer_to_next_function = mem.readIntLittle(u32, raw[12..16]),
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.unused = raw[16..18].*,
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};
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}
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fn asWeakExtDef(raw: []const u8) WeakExternalDefinition {
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return .{
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.tag_index = mem.readIntLittle(u32, raw[0..4]),
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.flag = @intToEnum(WeakExternalFlag, mem.readIntLittle(u32, raw[4..8])),
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.unused = raw[8..18].*,
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};
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}
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fn asFileDef(raw: []const u8) FileDefinition {
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return .{
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.file_name = raw[0..18].*,
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};
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}
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fn asSectDef(raw: []const u8) SectionDefinition {
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return .{
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.length = mem.readIntLittle(u32, raw[0..4]),
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.number_of_relocations = mem.readIntLittle(u16, raw[4..6]),
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.number_of_linenumbers = mem.readIntLittle(u16, raw[6..8]),
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.checksum = mem.readIntLittle(u32, raw[8..12]),
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.number = mem.readIntLittle(u16, raw[12..14]),
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.selection = @intToEnum(ComdatSelection, raw[14]),
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.unused = raw[15..18].*,
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};
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}
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const Slice = struct {
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buffer: []const u8,
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num: usize,
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count: usize = 0,
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/// Lives as long as Symtab instance.
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fn next(self: *Slice) ?Symbol {
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if (self.count >= self.num) return null;
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const sym = asSymbol(self.buffer[0..Symbol.sizeOf()]);
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self.count += 1;
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self.buffer = self.buffer[Symbol.sizeOf()..];
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return sym;
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}
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};
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fn slice(self: Symtab, start: usize, end: ?usize) Slice {
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const offset = start * Symbol.sizeOf();
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const llen = if (end) |e| e * Symbol.sizeOf() else self.buffer.len;
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const num = @divExact(llen - offset, Symbol.sizeOf());
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return Slice{ .buffer = self.buffer[offset..][0..llen], .num = num };
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pub fn next(self: *Slice) ?Symbol {
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if (self.count >= self.num) return null;
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const sym = asSymbol(self.buffer[0..Symbol.sizeOf()]);
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self.count += 1;
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self.buffer = self.buffer[Symbol.sizeOf()..];
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return sym;
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}
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};
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pub const Strtab = struct {
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buffer: []const u8,
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fn get(self: Strtab, off: u32) []const u8 {
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assert(off < self.buffer.len);
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return mem.sliceTo(@ptrCast([*:0]const u8, self.buffer.ptr + off), 0);
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}
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};
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pub fn slice(self: Symtab, start: usize, end: ?usize) Slice {
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const offset = start * Symbol.sizeOf();
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const llen = if (end) |e| e * Symbol.sizeOf() else self.buffer.len;
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const num = @divExact(llen - offset, Symbol.sizeOf());
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return Slice{ .buffer = self.buffer[offset..][0..llen], .num = num };
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}
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};
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pub const Strtab = struct {
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buffer: []const u8,
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pub fn get(self: Strtab, off: u32) []const u8 {
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assert(off < self.buffer.len);
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return mem.sliceTo(@ptrCast([*:0]const u8, self.buffer.ptr + off), 0);
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}
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};
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