Commit b03983b4501031e6faed47bf886586b0ad2150aa | zig

author	Jakub Konka <kubkon@jakubkonka.com> 2021-04-21 17:53:07+02:00
committer	Jakub Konka <kubkon@jakubkonka.com> 2021-04-24 08:13:53+02:00
log	b03983b4501031e6faed47bf886586b0ad2150aa
tree	0f410332cc8949d148b4741e0e7c7135f8a92bfd
parent	4f7765de7c0203ceed3a5acbe0d4c07b678557b5

zld: analyze static initializers

2 files changed, 21 insertions(+), 5 deletions(-)

src
- link
  - MachO
    Object.zig
    Zld.zig

src/link/MachO/Object.zig+20-4

 @@ -14,6 +14,7 @@ const Allocator = mem.Allocator;
 const Relocation = reloc.Relocation;
 const Symbol = @import("Symbol.zig");
 const parseName = @import("Zld.zig").parseName;
+const CppStatic = @import("Zld.zig").CppStatic;
 usingnamespace @import("commands.zig");
 @@ -216,6 +217,7 @@ pub fn parse(self: *Object) !void {
     try self.parseSections();
     if (self.symtab_cmd_index != null) try self.parseSymtab();
     if (self.data_in_code_cmd_index != null) try self.readDataInCode();
+    try self.parseInitializers();
     try self.parseDebugInfo();
 }
 @@ -298,28 +300,42 @@ pub fn parseSections(self: *Object) !void {
         var section = Section{
             .inner = sect,
             .code = code,
-            .relocs = undefined,
+            .relocs = null,
         };
         // Parse relocations
-        section.relocs = if (sect.nreloc > 0) relocs: {
+        if (sect.nreloc > 0) {
             var raw_relocs = try self.allocator.alloc(u8, @sizeOf(macho.relocation_info) * sect.nreloc);
             defer self.allocator.free(raw_relocs);
             _ = try self.file.?.preadAll(raw_relocs, sect.reloff);
-            break :relocs try reloc.parse(
+            section.relocs = try reloc.parse(
                 self.allocator,
                 self.arch.?,
                 section.code,
                 mem.bytesAsSlice(macho.relocation_info, raw_relocs),
             );
-        } else null;
+        }
         self.sections.appendAssumeCapacity(section);
     }
 }
+pub fn parseInitializers(self: *Object) !void {
+    for (self.sections.items) |section| {
+        if (section.inner.flags != macho.S_MOD_INIT_FUNC_POINTERS) continue;
+        log.warn("parsing initializers in {s}", .{self.name.?});
+        // Parse C++ initializers
+        const relocs = section.relocs orelse unreachable;
+        for (relocs) |rel| {
+            const sym = self.symtab.items[rel.target.symbol];
+            const sym_name = self.getString(sym.n_strx);
+            log.warn("    | {s}", .{sym_name});
+        }
+    }
+}
 pub fn parseSymtab(self: *Object) !void {
     const symtab_cmd = self.load_commands.items[self.symtab_cmd_index.?].Symtab;

src/link/MachO/Zld.zig+1-1

...	@@ -90,7 +90,7 @@ stub_helper_stubs_start_off: ?u64 = null,	...	@@ -90,7 +90,7 @@ stub_helper_stubs_start_off: ?u64 = null,
90	mappings: std.AutoHashMapUnmanaged(MappingKey, SectionMapping) = .{},	90	mappings: std.AutoHashMapUnmanaged(MappingKey, SectionMapping) = .{},
91	unhandled_sections: std.AutoHashMapUnmanaged(MappingKey, u0) = .{},	91	unhandled_sections: std.AutoHashMapUnmanaged(MappingKey, u0) = .{},
92		92
93	const CppStatic = struct {	93	pub const CppStatic = struct {
94	index: u32,	94	index: u32,
95	target_addr: u64,	95	target_addr: u64,
96	file: u16,	96	file: u16,