libdyn: Update for zig=0.11
Zig=0.11 renamed bunch of builtin functions, and while "zig fmt" tried to update code automatically, some manual labour was necessary. Not amused.
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@ -5,6 +5,7 @@
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const std = @import("std");
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const elf = std.elf;
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const c = std.c;
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const eq = std.math.Order.eq;
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const debug = false;
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@ -34,7 +35,7 @@ const MMap = struct {
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if (debug) std.debug.print("offset = {d}\n", .{offset});
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if (debug) std.debug.print("diff = {d}\n", .{diff});
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if (debug) std.debug.print("real offset = {d}\n", .{@intCast(i64, offset - diff)});
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if (debug) std.debug.print("real offset = {d}\n", .{@as(i64, @intCast(offset - diff))});
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var ptr = c.mmap(
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null,
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@ -42,28 +43,28 @@ const MMap = struct {
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prot,
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mmap.MAP_PRIVATE,
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fd,
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@intCast(i64, offset - diff),
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@as(i64, @intCast(offset - diff)),
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);
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if (ptr == mmap.MAP_FAILED) return null;
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return MMap{
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.ptr = @intToPtr(*align(8) anyopaque, @ptrToInt(ptr) + diff),
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.ptr = @as(*align(8) anyopaque, @ptrFromInt(@intFromPtr(ptr) + diff)),
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.size = size,
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};
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}
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fn destroy(this: MMap) void {
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// See note on [mmap offsets] in libdyn.h
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var diff = @ptrToInt(this.ptr) & @as(u64, 4095);
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var ptr = @intToPtr(*align(4096) anyopaque, @ptrToInt(this.ptr) - diff);
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var diff = @intFromPtr(this.ptr) & @as(u64, 4095);
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var ptr = @as(*align(4096) anyopaque, @ptrFromInt(@intFromPtr(this.ptr) - diff));
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var size = this.size + diff;
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_ = c.munmap(ptr, size);
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}
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fn pointer(this: MMap, type_: anytype) [*]type_ {
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return @ptrCast([*]type_, this.ptr);
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return @as([*]type_, @ptrCast(this.ptr));
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}
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fn save(this: MMap, type_: anytype, dest: *type_) void {
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@ -73,7 +74,7 @@ const MMap = struct {
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fn restore(type_: anytype, src: *type_) MMap {
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return MMap{
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.ptr = @intToPtr(*align(8) anyopaque, @ptrToInt(src.ptr)),
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.ptr = @as(*align(8) anyopaque, @ptrFromInt(@intFromPtr(src.ptr))),
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.size = src.size,
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};
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}
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@ -83,7 +84,7 @@ pub export fn libdyn_open(lib: *self.libdyn_library, fd: c_int) c_int {
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// TODO: add support for elf32.
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var ehdr: elf.Elf64_Ehdr = undefined;
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const size = @sizeOf(@TypeOf(ehdr));
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var bytes = c.read(fd, @ptrCast([*]u8, &ehdr), size);
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var bytes = c.read(fd, @as([*]u8, @ptrCast(&ehdr)), size);
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if (bytes != size) {
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if (debug) std.debug.print("Bytes {d} != size {d}", .{ bytes, size });
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@ -119,11 +120,11 @@ pub export fn libdyn_open(lib: *self.libdyn_library, fd: c_int) c_int {
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var dynsym: ?MMap = null;
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var strtab: ?MMap = null;
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for (shdrs[0..ehdr.e_shnum]) |shdr, ix| {
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var name = @ptrCast([*:0]u8, shstrtab.ptr) + shdr.sh_name;
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for (shdrs[0..ehdr.e_shnum], 0..) |shdr, ix| {
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var name = @as([*:0]u8, @ptrCast(shstrtab.ptr)) + shdr.sh_name;
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if (debug) std.debug.print("Section name : {s} (ix = {})\n", .{ name, ix });
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if (std.cstr.cmp(name, ".plt") == 0 or std.cstr.cmp(name, ".rela.plt") == 0) {
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if (std.mem.orderZ(u8, name, ".plt") == eq or std.mem.orderZ(u8, name, ".rela.plt") == eq) {
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if (text) |x| x.destroy();
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if (dynsym) |x| x.destroy();
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if (strtab) |x| x.destroy();
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@ -132,7 +133,7 @@ pub export fn libdyn_open(lib: *self.libdyn_library, fd: c_int) c_int {
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// If there are more than one .text section, it probably won't work,
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// but at least I will avoid memory leak with "text == null" check.
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if (text == null and std.cstr.cmp(name, ".text") == 0) {
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if (text == null and std.mem.orderZ(u8, name, ".text") == eq) {
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if (debug) std.debug.print("text idx: {} offset = {}\n", .{ ix, shdr.sh_offset });
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text = MMap.create(fd, shdr.sh_size, shdr.sh_offset, true);
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lib.__offset = shdr.sh_offset;
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@ -166,15 +167,15 @@ pub export fn libdyn_symbol(out: **anyopaque, lib: *const self.libdyn_library, s
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if (debug) std.debug.print("count = {d}\n", .{count});
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for (@intToPtr([*]elf.Elf64_Sym, @ptrToInt(lib.dynsym.ptr))[0..count]) |sym, ix| {
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for (@as([*]elf.Elf64_Sym, @ptrFromInt(@intFromPtr(lib.dynsym.ptr)))[0..count], 0..) |sym, ix| {
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if (debug) std.debug.print("st_name[{d}]: {d}\n", .{ ix, sym.st_name });
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var name = @ptrCast([*:0]u8, lib.strtab.ptr) + sym.st_name;
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var name = @as([*:0]u8, @ptrCast(lib.strtab.ptr)) + sym.st_name;
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if (debug) std.debug.print("sym = {}\n", .{sym});
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if (debug) std.debug.print("name = {s}\n", .{name});
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if (std.cstr.cmp(name, symbol) != 0) continue;
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if (std.mem.orderZ(u8, name, symbol) != eq) continue;
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out.* = @intToPtr(*anyopaque, @ptrToInt(lib.text.ptr) + sym.st_value - lib.__offset);
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out.* = @as(*anyopaque, @ptrFromInt(@intFromPtr(lib.text.ptr) + sym.st_value - lib.__offset));
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return 0;
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}
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