zig

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Object.zig (1871B) - Raw

      1 const std = @import("std");
      2 const Allocator = std.mem.Allocator;
      3 const Elf = @import("Object/Elf.zig");
      4 
      5 const Object = @This();
      6 
      7 format: std.Target.ObjectFormat,
      8 target: std.Target,
      9 
     10 pub fn create(gpa: Allocator, target: std.Target) !*Object {
     11     switch (target.ofmt) {
     12         .elf => return Elf.create(gpa, target),
     13         else => unreachable,
     14     }
     15 }
     16 
     17 pub fn deinit(obj: *Object) void {
     18     switch (obj.format) {
     19         .elf => @as(*Elf, @alignCast(@fieldParentPtr("obj", obj))).deinit(),
     20         else => unreachable,
     21     }
     22 }
     23 
     24 pub const Section = union(enum) {
     25     undefined,
     26     data,
     27     read_only_data,
     28     func,
     29     strings,
     30     custom: []const u8,
     31 };
     32 
     33 pub fn getSection(obj: *Object, section: Section) !*std.array_list.Managed(u8) {
     34     switch (obj.format) {
     35         .elf => return @as(*Elf, @alignCast(@fieldParentPtr("obj", obj))).getSection(section),
     36         else => unreachable,
     37     }
     38 }
     39 
     40 pub const SymbolType = enum {
     41     func,
     42     variable,
     43     external,
     44 };
     45 
     46 pub fn declareSymbol(
     47     obj: *Object,
     48     section: Section,
     49     name: ?[]const u8,
     50     linkage: std.builtin.GlobalLinkage,
     51     @"type": SymbolType,
     52     offset: u64,
     53     size: u64,
     54 ) ![]const u8 {
     55     switch (obj.format) {
     56         .elf => return @as(*Elf, @alignCast(@fieldParentPtr("obj", obj))).declareSymbol(section, name, linkage, @"type", offset, size),
     57         else => unreachable,
     58     }
     59 }
     60 
     61 pub fn addRelocation(obj: *Object, name: []const u8, section: Section, address: u64, addend: i64) !void {
     62     switch (obj.format) {
     63         .elf => return @as(*Elf, @alignCast(@fieldParentPtr("obj", obj))).addRelocation(name, section, address, addend),
     64         else => unreachable,
     65     }
     66 }
     67 
     68 pub fn finish(obj: *Object, file: std.fs.File) !void {
     69     switch (obj.format) {
     70         .elf => return @as(*Elf, @alignCast(@fieldParentPtr("obj", obj))).finish(file),
     71         else => unreachable,
     72     }
     73 }