link: fix memory leaks

 * Fix linker memory leaks found while running `zig build test-cases`.
 * Add missing target to test manifest.

Author: jacobly0

src/link.zig

@@ -223,7 +223,9 @@ pub const Options = struct {
 
     pub fn move(self: *Options) Options {
         const copied_state = self.*;
+        self.frameworks = .{};
         self.system_libs = .{};
+        self.force_undefined_symbols = .{};
         return copied_state;
     }
 };
@@ -624,7 +626,9 @@ pub const File = struct {
         base.releaseLock();
         if (base.file) |f| f.close();
         if (base.intermediary_basename) |sub_path| base.allocator.free(sub_path);
+        base.options.frameworks.deinit(base.allocator);
         base.options.system_libs.deinit(base.allocator);
+        base.options.force_undefined_symbols.deinit(base.allocator);
         switch (base.tag) {
             .coff => {
                 if (build_options.only_c) unreachable;

src/link/Coff.zig

@@ -289,6 +289,7 @@ pub fn deinit(self: *Coff) void {
 
     self.unresolved.deinit(gpa);
     self.locals_free_list.deinit(gpa);
+    self.globals_free_list.deinit(gpa);
     self.strtab.deinit(gpa);
     self.got_entries.deinit(gpa);
     self.got_entries_free_list.deinit(gpa);
@@ -1150,8 +1151,10 @@ fn updateDeclCode(self: *Coff, decl_index: Module.Decl.Index, code: []const u8,
 }
 
 fn freeRelocationsForAtom(self: *Coff, atom: *Atom) void {
-    _ = self.relocs.remove(atom);
-    _ = self.base_relocs.remove(atom);
+    var removed_relocs = self.relocs.fetchRemove(atom);
+    if (removed_relocs) |*relocs| relocs.value.deinit(self.base.allocator);
+    var removed_base_relocs = self.base_relocs.fetchRemove(atom);
+    if (removed_base_relocs) |*base_relocs| base_relocs.value.deinit(self.base.allocator);
 }
 
 fn freeUnnamedConsts(self: *Coff, decl_index: Module.Decl.Index) void {
@@ -1489,9 +1492,8 @@ pub fn getGlobalSymbol(self: *Coff, name: []const u8) !u32 {
     gop.value_ptr.* = sym_loc;
 
     const gpa = self.base.allocator;
-    const sym_name = try gpa.dupe(u8, name);
     const sym = self.getSymbolPtr(sym_loc);
-    try self.setSymbolName(sym, sym_name);
+    try self.setSymbolName(sym, name);
     sym.storage_class = .EXTERNAL;
 
     try self.unresolved.putNoClobber(gpa, global_index, true);

src/link/MachO.zig

@@ -2576,10 +2576,14 @@ pub fn deleteExport(self: *MachO, exp: Export) void {
 }
 
 fn freeRelocationsForAtom(self: *MachO, atom: *Atom) void {
-    _ = self.relocs.remove(atom);
-    _ = self.rebases.remove(atom);
-    _ = self.bindings.remove(atom);
-    _ = self.lazy_bindings.remove(atom);
+    var removed_relocs = self.relocs.fetchRemove(atom);
+    if (removed_relocs) |*relocs| relocs.value.deinit(self.base.allocator);
+    var removed_rebases = self.rebases.fetchRemove(atom);
+    if (removed_rebases) |*rebases| rebases.value.deinit(self.base.allocator);
+    var removed_bindings = self.bindings.fetchRemove(atom);
+    if (removed_bindings) |*bindings| bindings.value.deinit(self.base.allocator);
+    var removed_lazy_bindings = self.lazy_bindings.fetchRemove(atom);
+    if (removed_lazy_bindings) |*lazy_bindings| lazy_bindings.value.deinit(self.base.allocator);
 }
 
 fn freeUnnamedConsts(self: *MachO, decl_index: Module.Decl.Index) void {

src/link/Plan9.zig

@@ -201,7 +201,10 @@ fn putFn(self: *Plan9, decl_index: Module.Decl.Index, out: FnDeclOutput) !void {
     const decl = mod.declPtr(decl_index);
     const fn_map_res = try self.fn_decl_table.getOrPut(gpa, decl.getFileScope());
     if (fn_map_res.found_existing) {
-        try fn_map_res.value_ptr.functions.put(gpa, decl_index, out);
+        if (try fn_map_res.value_ptr.functions.fetchPut(gpa, decl_index, out)) |old_entry| {
+            gpa.free(old_entry.value.code);
+            gpa.free(old_entry.value.lineinfo);
+        }
     } else {
         const file = decl.getFileScope();
         const arena = self.path_arena.allocator();
@@ -408,9 +411,11 @@ pub fn updateDecl(self: *Plan9, module: *Module, decl_index: Module.Decl.Index)
             return;
         },
     };
-    var duped_code = try self.base.allocator.dupe(u8, code);
-    errdefer self.base.allocator.free(duped_code);
-    try self.data_decl_table.put(self.base.allocator, decl_index, duped_code);
+    try self.data_decl_table.ensureUnusedCapacity(self.base.allocator, 1);
+    const duped_code = try self.base.allocator.dupe(u8, code);
+    if (self.data_decl_table.fetchPutAssumeCapacity(decl_index, duped_code)) |old_entry| {
+        self.base.allocator.free(old_entry.value);
+    }
     return self.updateFinish(decl);
 }
 /// called at the end of update{Decl,Func}
@@ -743,14 +748,19 @@ pub fn freeDecl(self: *Plan9, decl_index: Module.Decl.Index) void {
     if (is_fn) {
         var symidx_and_submap = self.fn_decl_table.get(decl.getFileScope()).?;
         var submap = symidx_and_submap.functions;
-        _ = submap.swapRemove(decl_index);
+        if (submap.fetchSwapRemove(decl_index)) |removed_entry| {
+            self.base.allocator.free(removed_entry.value.code);
+            self.base.allocator.free(removed_entry.value.lineinfo);
+        }
         if (submap.count() == 0) {
             self.syms.items[symidx_and_submap.sym_index] = aout.Sym.undefined_symbol;
             self.syms_index_free_list.append(self.base.allocator, symidx_and_submap.sym_index) catch {};
             submap.deinit(self.base.allocator);
         }
     } else {
-        _ = self.data_decl_table.swapRemove(decl_index);
+        if (self.data_decl_table.fetchSwapRemove(decl_index)) |removed_entry| {
+            self.base.allocator.free(removed_entry.value);
+        }
     }
     if (decl.link.plan9.got_index) |i| {
         // TODO: if this catch {} is triggered, an assertion in flushModule will be triggered, because got_index_free_list will have the wrong length

test/cases/plan9/hello_world_with_updates.1.zig

@@ -5,6 +5,7 @@ pub fn main() void {
 }
 
 // run
+// target=x86_64-plan9
 //
 // Hello World
 //