mirror/zig
1
0
Fork 0
mirror of https://github.com/ziglang/zig.git synced 2026-02-13 12:59:04 +00:00
Code Issues Packages Projects Releases Wiki Activity

elf: migrate to new non-allocateDeclIndexes API

Browse Source
This commit is contained in:
Jakub Konka 2023-01-26 13:17:38 +01:00
parent fb8d754a4b
commit e1b9800ffa
10 changed files with 175 additions and 163 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/Module.zig
View File

@ -5324,7 +5324,7 @@ pub fn deleteUnusedDecl(mod: *Module, decl_index: Decl.Index) void {
// Until then, we did call `allocateDeclIndexes` on this anonymous Decl and so we
// must call `freeDecl` in the linker backend now.
switch (mod.comp.bin_file.tag) {
.macho, .c => {}, // this linker backend has already migrated to the new API
.elf, .macho, .c => {}, // this linker backend has already migrated to the new API
else => if (decl.has_tv) {
if (decl.ty.isFnOrHasRuntimeBits()) {
mod.comp.bin_file.freeDecl(decl_index);

17
src/arch/aarch64/CodeGen.zig
View File

@ -4307,12 +4307,8 @@ fn airCall(self: *Self, inst: Air.Inst.Index, modifier: std.builtin.CallModifier
const fn_owner_decl = mod.declPtr(func.owner_decl);
if (self.bin_file.cast(link.File.Elf)) |elf_file| {
const ptr_bits = self.target.cpu.arch.ptrBitWidth();
const ptr_bytes: u64 = @divExact(ptr_bits, 8);
const got_addr = blk: {
const got = &elf_file.program_headers.items[elf_file.phdr_got_index.?];
break :blk @intCast(u32, got.p_vaddr + fn_owner_decl.link.elf.offset_table_index * ptr_bytes);
};
try fn_owner_decl.link.elf.ensureInitialized(elf_file);
const got_addr = @intCast(u32, fn_owner_decl.link.elf.getOffsetTableAddress(elf_file));
try self.genSetReg(Type.initTag(.usize), .x30, .{ .memory = got_addr });
} else if (self.bin_file.cast(link.File.MachO)) |macho_file| {
try fn_owner_decl.link.macho.ensureInitialized(macho_file);
@ -6125,20 +6121,15 @@ fn lowerDeclRef(self: *Self, tv: TypedValue, decl_index: Module.Decl.Index) Inne
mod.markDeclAlive(decl);
if (self.bin_file.cast(link.File.Elf)) |elf_file| {
const got = &elf_file.program_headers.items[elf_file.phdr_got_index.?];
const got_addr = got.p_vaddr + decl.link.elf.offset_table_index * ptr_bytes;
return MCValue{ .memory = got_addr };
try decl.link.elf.ensureInitialized(elf_file);
return MCValue{ .memory = decl.link.elf.getOffsetTableAddress(elf_file) };
} else if (self.bin_file.cast(link.File.MachO)) |macho_file| {
// Because MachO is PIE-always-on, we defer memory address resolution until
// the linker has enough info to perform relocations.
try decl.link.macho.ensureInitialized(macho_file);
return MCValue{ .linker_load = .{
.type = .got,
.sym_index = decl.link.macho.getSymbolIndex().?,
} };
} else if (self.bin_file.cast(link.File.Coff)) |_| {
// Because COFF is PIE-always-on, we defer memory address resolution until
// the linker has enough info to perform relocations.
assert(decl.link.coff.sym_index != 0);
return MCValue{ .linker_load = .{
.type = .got,

103
src/arch/arm/CodeGen.zig
View File

@ -4253,59 +4253,57 @@ fn airCall(self: *Self, inst: Air.Inst.Index, modifier: std.builtin.CallModifier
// Due to incremental compilation, how function calls are generated depends
// on linking.
switch (self.bin_file.tag) {
.elf => {
if (self.air.value(callee)) |func_value| {
if (func_value.castTag(.function)) |func_payload| {
const func = func_payload.data;
const ptr_bits = self.target.cpu.arch.ptrBitWidth();
const ptr_bytes: u64 = @divExact(ptr_bits, 8);
const mod = self.bin_file.options.module.?;
const fn_owner_decl = mod.declPtr(func.owner_decl);
const got_addr = if (self.bin_file.cast(link.File.Elf)) |elf_file| blk: {
const got = &elf_file.program_headers.items[elf_file.phdr_got_index.?];
break :blk @intCast(u32, got.p_vaddr + fn_owner_decl.link.elf.offset_table_index * ptr_bytes);
} else unreachable;
try self.genSetReg(Type.initTag(.usize), .lr, .{ .memory = got_addr });
} else if (func_value.castTag(.extern_fn)) |_| {
return self.fail("TODO implement calling extern functions", .{});
} else {
return self.fail("TODO implement calling bitcasted functions", .{});
}
if (self.air.value(callee)) |func_value| {
if (func_value.castTag(.function)) |func_payload| {
const func = func_payload.data;
const mod = self.bin_file.options.module.?;
const fn_owner_decl = mod.declPtr(func.owner_decl);
if (self.bin_file.cast(link.File.Elf)) |elf_file| {
try fn_owner_decl.link.elf.ensureInitialized(elf_file);
const got_addr = @intCast(u32, fn_owner_decl.link.elf.getOffsetTableAddress(elf_file));
try self.genSetReg(Type.initTag(.usize), .lr, .{ .memory = got_addr });
} else if (self.bin_file.cast(link.File.MachO)) |_| {
unreachable; // unsupported architecture for MachO
} else {
assert(ty.zigTypeTag() == .Pointer);
const mcv = try self.resolveInst(callee);
try self.genSetReg(Type.initTag(.usize), .lr, mcv);
}
// TODO: add Instruction.supportedOn
// function for ARM
if (Target.arm.featureSetHas(self.target.cpu.features, .has_v5t)) {
_ = try self.addInst(.{
.tag = .blx,
.data = .{ .reg = .lr },
return self.fail("TODO implement call on {s} for {s}", .{
@tagName(self.bin_file.tag),
@tagName(self.target.cpu.arch),
});
} else {
return self.fail("TODO fix blx emulation for ARM <v5", .{});
// _ = try self.addInst(.{
// .tag = .mov,
// .data = .{ .rr_op = .{
// .rd = .lr,
// .rn = .r0,
// .op = Instruction.Operand.reg(.pc, Instruction.Operand.Shift.none),
// } },
// });
// _ = try self.addInst(.{
// .tag = .bx,
// .data = .{ .reg = .lr },
// });
}
},
.macho => unreachable, // unsupported architecture for MachO
.coff => return self.fail("TODO implement call in COFF for {}", .{self.target.cpu.arch}),
.plan9 => return self.fail("TODO implement call on plan9 for {}", .{self.target.cpu.arch}),
else => unreachable,
} else if (func_value.castTag(.extern_fn)) |_| {
return self.fail("TODO implement calling extern functions", .{});
} else {
return self.fail("TODO implement calling bitcasted functions", .{});
}
} else {
assert(ty.zigTypeTag() == .Pointer);
const mcv = try self.resolveInst(callee);
try self.genSetReg(Type.initTag(.usize), .lr, mcv);
}
// TODO: add Instruction.supportedOn
// function for ARM
if (Target.arm.featureSetHas(self.target.cpu.features, .has_v5t)) {
_ = try self.addInst(.{
.tag = .blx,
.data = .{ .reg = .lr },
});
} else {
return self.fail("TODO fix blx emulation for ARM <v5", .{});
// _ = try self.addInst(.{
// .tag = .mov,
// .data = .{ .rr_op = .{
// .rd = .lr,
// .rn = .r0,
// .op = Instruction.Operand.reg(.pc, Instruction.Operand.Shift.none),
// } },
// });
// _ = try self.addInst(.{
// .tag = .bx,
// .data = .{ .reg = .lr },
// });
}
const result: MCValue = result: {
@ -6086,9 +6084,8 @@ fn lowerDeclRef(self: *Self, tv: TypedValue, decl_index: Module.Decl.Index) Inne
mod.markDeclAlive(decl);
if (self.bin_file.cast(link.File.Elf)) |elf_file| {
const got = &elf_file.program_headers.items[elf_file.phdr_got_index.?];
const got_addr = got.p_vaddr + decl.link.elf.offset_table_index * ptr_bytes;
return MCValue{ .memory = got_addr };
try decl.link.elf.ensureInitialized(elf_file);
return MCValue{ .memory = decl.link.elf.getOffsetTableAddress(elf_file) };
} else if (self.bin_file.cast(link.File.MachO)) |_| {
unreachable; // unsupported architecture for MachO
} else if (self.bin_file.cast(link.File.Coff)) |_| {

13
src/arch/riscv64/CodeGen.zig
View File

@ -1722,14 +1722,10 @@ fn airCall(self: *Self, inst: Air.Inst.Index, modifier: std.builtin.CallModifier
if (func_value.castTag(.function)) |func_payload| {
const func = func_payload.data;
const ptr_bits = self.target.cpu.arch.ptrBitWidth();
const ptr_bytes: u64 = @divExact(ptr_bits, 8);
const mod = self.bin_file.options.module.?;
const fn_owner_decl = mod.declPtr(func.owner_decl);
const got_addr = blk: {
const got = &elf_file.program_headers.items[elf_file.phdr_got_index.?];
break :blk @intCast(u32, got.p_vaddr + fn_owner_decl.link.elf.offset_table_index * ptr_bytes);
};
try fn_owner_decl.link.elf.ensureInitialized(elf_file);
const got_addr = @intCast(u32, fn_owner_decl.link.elf.getOffsetTableAddress(elf_file));
try self.genSetReg(Type.initTag(.usize), .ra, .{ .memory = got_addr });
_ = try self.addInst(.{
@ -2557,9 +2553,8 @@ fn lowerDeclRef(self: *Self, tv: TypedValue, decl_index: Module.Decl.Index) Inne
const decl = mod.declPtr(decl_index);
mod.markDeclAlive(decl);
if (self.bin_file.cast(link.File.Elf)) |elf_file| {
const got = &elf_file.program_headers.items[elf_file.phdr_got_index.?];
const got_addr = got.p_vaddr + decl.link.elf.offset_table_index * ptr_bytes;
return MCValue{ .memory = got_addr };
try decl.link.elf.ensureInitialized(elf_file);
return MCValue{ .memory = decl.link.elf.getOffsetTableAddress(elf_file) };
} else if (self.bin_file.cast(link.File.MachO)) |_| {
// TODO I'm hacking my way through here by repurposing .memory for storing
// index to the GOT target symbol index.

17
src/arch/sparc64/CodeGen.zig
View File

@ -1216,12 +1216,11 @@ fn airCall(self: *Self, inst: Air.Inst.Index, modifier: std.builtin.CallModifier
if (self.bin_file.tag == link.File.Elf.base_tag) {
if (func_value.castTag(.function)) |func_payload| {
const func = func_payload.data;
const ptr_bits = self.target.cpu.arch.ptrBitWidth();
const ptr_bytes: u64 = @divExact(ptr_bits, 8);
const mod = self.bin_file.options.module.?;
const fn_owner_decl = mod.declPtr(func.owner_decl);
const got_addr = if (self.bin_file.cast(link.File.Elf)) |elf_file| blk: {
const got = &elf_file.program_headers.items[elf_file.phdr_got_index.?];
const mod = self.bin_file.options.module.?;
break :blk @intCast(u32, got.p_vaddr + mod.declPtr(func.owner_decl).link.elf.offset_table_index * ptr_bytes);
try fn_owner_decl.link.elf.ensureInitialized(elf_file);
break :blk @intCast(u32, fn_owner_decl.link.elf.getOffsetTableAddress(elf_file));
} else unreachable;
try self.genSetReg(Type.initTag(.usize), .o7, .{ .memory = got_addr });
@ -4193,9 +4192,6 @@ fn load(self: *Self, dst_mcv: MCValue, ptr: MCValue, ptr_ty: Type) InnerError!vo
}
fn lowerDeclRef(self: *Self, tv: TypedValue, decl_index: Module.Decl.Index) InnerError!MCValue {
const ptr_bits = self.target.cpu.arch.ptrBitWidth();
const ptr_bytes: u64 = @divExact(ptr_bits, 8);
// TODO this feels clunky. Perhaps we should check for it in `genTypedValue`?
if (tv.ty.zigTypeTag() == .Pointer) blk: {
if (tv.ty.castPtrToFn()) |_| break :blk;
@ -4209,9 +4205,8 @@ fn lowerDeclRef(self: *Self, tv: TypedValue, decl_index: Module.Decl.Index) Inne
mod.markDeclAlive(decl);
if (self.bin_file.cast(link.File.Elf)) |elf_file| {
const got = &elf_file.program_headers.items[elf_file.phdr_got_index.?];
const got_addr = got.p_vaddr + decl.link.elf.offset_table_index * ptr_bytes;
return MCValue{ .memory = got_addr };
try decl.link.elf.ensureInitialized(elf_file);
return MCValue{ .memory = decl.link.elf.getOffsetTableAddress(elf_file) };
} else {
return self.fail("TODO codegen non-ELF const Decl pointer", .{});
}

15
src/arch/x86_64/CodeGen.zig
View File

@ -3998,16 +3998,12 @@ fn airCall(self: *Self, inst: Air.Inst.Index, modifier: std.builtin.CallModifier
const fn_owner_decl = mod.declPtr(func.owner_decl);
if (self.bin_file.cast(link.File.Elf)) |elf_file| {
const ptr_bits = self.target.cpu.arch.ptrBitWidth();
const ptr_bytes: u64 = @divExact(ptr_bits, 8);
const got_addr = blk: {
const got = &elf_file.program_headers.items[elf_file.phdr_got_index.?];
break :blk @intCast(u32, got.p_vaddr + fn_owner_decl.link.elf.offset_table_index * ptr_bytes);
};
try fn_owner_decl.link.elf.ensureInitialized(elf_file);
const got_addr = @intCast(u32, fn_owner_decl.link.elf.getOffsetTableAddress(elf_file));
_ = try self.addInst(.{
.tag = .call,
.ops = Mir.Inst.Ops.encode(.{ .flags = 0b01 }),
.data = .{ .imm = @truncate(u32, got_addr) },
.data = .{ .imm = got_addr },
});
} else if (self.bin_file.cast(link.File.Coff)) |_| {
try self.genSetReg(Type.initTag(.usize), .rax, .{
@ -6721,9 +6717,8 @@ fn lowerDeclRef(self: *Self, tv: TypedValue, decl_index: Module.Decl.Index) Inne
module.markDeclAlive(decl);
if (self.bin_file.cast(link.File.Elf)) |elf_file| {
const got = &elf_file.program_headers.items[elf_file.phdr_got_index.?];
const got_addr = got.p_vaddr + decl.link.elf.offset_table_index * ptr_bytes;
return MCValue{ .memory = got_addr };
try decl.link.elf.ensureInitialized(elf_file);
return MCValue{ .memory = decl.link.elf.getOffsetTableAddress(elf_file) };
} else if (self.bin_file.cast(link.File.MachO)) |macho_file| {
try decl.link.macho.ensureInitialized(macho_file);
return MCValue{ .linker_load = .{

2
src/link.zig
View File

@ -616,7 +616,7 @@ pub const File = struct {
}
switch (base.tag) {
.coff => return @fieldParentPtr(Coff, "base", base).allocateDeclIndexes(decl_index),
.elf => return @fieldParentPtr(Elf, "base", base).allocateDeclIndexes(decl_index),
.elf => {}, // no-op
.macho => {}, // no-op
.wasm => return @fieldParentPtr(Wasm, "base", base).allocateDeclIndexes(decl_index),
.plan9 => return @fieldParentPtr(Plan9, "base", base).allocateDeclIndexes(decl_index),

110
src/link/Elf.zig
View File

@ -344,9 +344,10 @@ pub fn getDeclVAddr(self: *Elf, decl_index: Module.Decl.Index, reloc_info: File.
const decl = mod.declPtr(decl_index);
assert(self.llvm_object == null);
assert(decl.link.elf.local_sym_index != 0);
const target = decl.link.elf.local_sym_index;
try decl.link.elf.ensureInitialized(self);
const target = decl.link.elf.getSymbolIndex().?;
const vaddr = self.local_symbols.items[target].st_value;
const atom = self.atom_by_index_table.get(reloc_info.parent_atom_index).?;
const gop = try self.relocs.getOrPut(self.base.allocator, atom);
@ -447,7 +448,7 @@ fn makeString(self: *Elf, bytes: []const u8) !u32 {
return @intCast(u32, result);
}
fn getString(self: Elf, str_off: u32) []const u8 {
pub fn getString(self: Elf, str_off: u32) []const u8 {
assert(str_off < self.shstrtab.items.len);
return mem.sliceTo(@ptrCast([*:0]const u8, self.shstrtab.items.ptr + str_off), 0);
}
@ -2069,7 +2070,7 @@ fn freeTextBlock(self: *Elf, text_block: *TextBlock, phdr_index: u16) void {
if (text_block.prev) |prev| {
prev.next = text_block.next;
if (!already_have_free_list_node and prev.freeListEligible(self.*)) {
if (!already_have_free_list_node and prev.freeListEligible(self)) {
// The free list is heuristics, it doesn't have to be perfect, so we can
// ignore the OOM here.
free_list.append(self.base.allocator, prev) catch {};
@ -2084,6 +2085,15 @@ fn freeTextBlock(self: *Elf, text_block: *TextBlock, phdr_index: u16) void {
text_block.next = null;
}
// Appending to free lists is allowed to fail because the free lists are heuristics based anyway.
const local_sym_index = text_block.getSymbolIndex().?;
self.local_symbol_free_list.append(self.base.allocator, local_sym_index) catch {};
self.local_symbols.items[local_sym_index].st_info = 0;
_ = self.atom_by_index_table.remove(local_sym_index);
text_block.local_sym_index = 0;
self.offset_table_free_list.append(self.base.allocator, text_block.offset_table_index) catch {};
if (self.dwarf) |*dw| {
dw.freeAtom(&text_block.dbg_info_atom);
}
@ -2099,7 +2109,7 @@ fn shrinkTextBlock(self: *Elf, text_block: *TextBlock, new_block_size: u64, phdr
fn growTextBlock(self: *Elf, text_block: *TextBlock, new_block_size: u64, alignment: u64, phdr_index: u16) !u64 {
const sym = self.local_symbols.items[text_block.local_sym_index];
const align_ok = mem.alignBackwardGeneric(u64, sym.st_value, alignment) == sym.st_value;
const need_realloc = !align_ok or new_block_size > text_block.capacity(self.*);
const need_realloc = !align_ok or new_block_size > text_block.capacity(self);
if (!need_realloc) return sym.st_value;
return self.allocateTextBlock(text_block, new_block_size, alignment, phdr_index);
}
@ -2128,7 +2138,7 @@ fn allocateTextBlock(self: *Elf, text_block: *TextBlock, new_block_size: u64, al
// We now have a pointer to a live text block that has too much capacity.
// Is it enough that we could fit this new text block?
const sym = self.local_symbols.items[big_block.local_sym_index];
const capacity = big_block.capacity(self.*);
const capacity = big_block.capacity(self);
const ideal_capacity = padToIdeal(capacity);
const ideal_capacity_end_vaddr = std.math.add(u64, sym.st_value, ideal_capacity) catch ideal_capacity;
const capacity_end_vaddr = sym.st_value + capacity;
@ -2138,7 +2148,7 @@ fn allocateTextBlock(self: *Elf, text_block: *TextBlock, new_block_size: u64, al
// Additional bookkeeping here to notice if this free list node
// should be deleted because the block that it points to has grown to take up
// more of the extra capacity.
if (!big_block.freeListEligible(self.*)) {
if (!big_block.freeListEligible(self)) {
_ = free_list.swapRemove(i);
} else {
i += 1;
@ -2213,7 +2223,7 @@ fn allocateTextBlock(self: *Elf, text_block: *TextBlock, new_block_size: u64, al
return vaddr;
}
fn allocateLocalSymbol(self: *Elf) !u32 {
pub fn allocateLocalSymbol(self: *Elf) !u32 {
try self.local_symbols.ensureUnusedCapacity(self.base.allocator, 1);
const index = blk: {
@ -2240,7 +2250,7 @@ fn allocateLocalSymbol(self: *Elf) !u32 {
return index;
}
fn allocateGotOffset(self: *Elf) !u32 {
pub fn allocateGotOffset(self: *Elf) !u32 {
try self.offset_table.ensureUnusedCapacity(self.base.allocator, 1);
const index = blk: {
@ -2260,32 +2270,10 @@ fn allocateGotOffset(self: *Elf) !u32 {
return index;
}
pub fn allocateDeclIndexes(self: *Elf, decl_index: Module.Decl.Index) !void {
if (self.llvm_object) |_| return;
const mod = self.base.options.module.?;
const decl = mod.declPtr(decl_index);
const block = &decl.link.elf;
if (block.local_sym_index != 0) return;
const decl_name = try decl.getFullyQualifiedName(mod);
defer self.base.allocator.free(decl_name);
log.debug("allocating symbol indexes for {s}", .{decl_name});
block.local_sym_index = try self.allocateLocalSymbol();
block.offset_table_index = try self.allocateGotOffset();
try self.atom_by_index_table.putNoClobber(self.base.allocator, block.local_sym_index, block);
try self.decls.putNoClobber(self.base.allocator, decl_index, null);
}
fn freeUnnamedConsts(self: *Elf, decl_index: Module.Decl.Index) void {
const unnamed_consts = self.unnamed_const_atoms.getPtr(decl_index) orelse return;
for (unnamed_consts.items) |atom| {
self.freeTextBlock(atom, self.phdr_load_ro_index.?);
self.local_symbol_free_list.append(self.base.allocator, atom.local_sym_index) catch {};
self.local_symbols.items[atom.local_sym_index].st_info = 0;
_ = self.atom_by_index_table.remove(atom.local_sym_index);
}
unnamed_consts.clearAndFree(self.base.allocator);
}
@ -2298,20 +2286,13 @@ pub fn freeDecl(self: *Elf, decl_index: Module.Decl.Index) void {
const mod = self.base.options.module.?;
const decl = mod.declPtr(decl_index);
const kv = self.decls.fetchRemove(decl_index);
if (kv.?.value) |index| {
self.freeTextBlock(&decl.link.elf, index);
self.freeUnnamedConsts(decl_index);
}
log.debug("freeDecl {*}", .{decl});
// Appending to free lists is allowed to fail because the free lists are heuristics based anyway.
if (decl.link.elf.local_sym_index != 0) {
self.local_symbol_free_list.append(self.base.allocator, decl.link.elf.local_sym_index) catch {};
self.local_symbols.items[decl.link.elf.local_sym_index].st_info = 0;
_ = self.atom_by_index_table.remove(decl.link.elf.local_sym_index);
decl.link.elf.local_sym_index = 0;
self.offset_table_free_list.append(self.base.allocator, decl.link.elf.offset_table_index) catch {};
if (self.decls.fetchRemove(decl_index)) |kv| {
if (kv.value) |index| {
self.freeTextBlock(&decl.link.elf, index);
self.freeUnnamedConsts(decl_index);
}
}
if (self.dwarf) |*dw| {
@ -2363,7 +2344,7 @@ fn updateDeclCode(self: *Elf, decl_index: Module.Decl.Index, code: []const u8, s
assert(decl.link.elf.local_sym_index != 0); // Caller forgot to allocateDeclIndexes()
const local_sym = &self.local_symbols.items[decl.link.elf.local_sym_index];
if (local_sym.st_size != 0) {
const capacity = decl.link.elf.capacity(self.*);
const capacity = decl.link.elf.capacity(self);
const need_realloc = code.len > capacity or
!mem.isAlignedGeneric(u64, local_sym.st_value, required_alignment);
if (need_realloc) {
@ -2424,12 +2405,19 @@ pub fn updateFunc(self: *Elf, module: *Module, func: *Module.Fn, air: Air, liven
const tracy = trace(@src());
defer tracy.end();
var code_buffer = std.ArrayList(u8).init(self.base.allocator);
defer code_buffer.deinit();
const decl_index = func.owner_decl;
const decl = module.declPtr(decl_index);
self.freeUnnamedConsts(decl_index);
const atom = &decl.link.elf;
try atom.ensureInitialized(self);
const gop = try self.decls.getOrPut(self.base.allocator, decl_index);
if (gop.found_existing) {
self.freeUnnamedConsts(decl_index);
} else {
gop.value_ptr.* = null;
}
var code_buffer = std.ArrayList(u8).init(self.base.allocator);
defer code_buffer.deinit();
var decl_state: ?Dwarf.DeclState = if (self.dwarf) |*dw| try dw.initDeclState(module, decl_index) else null;
defer if (decl_state) |*ds| ds.deinit();
@ -2490,6 +2478,13 @@ pub fn updateDecl(self: *Elf, module: *Module, decl_index: Module.Decl.Index) !v
assert(!self.unnamed_const_atoms.contains(decl_index));
const atom = &decl.link.elf;
try atom.ensureInitialized(self);
const gop = try self.decls.getOrPut(self.base.allocator, decl_index);
if (!gop.found_existing) {
gop.value_ptr.* = null;
}
var code_buffer = std.ArrayList(u8).init(self.base.allocator);
defer code_buffer.deinit();
@ -2633,16 +2628,19 @@ pub fn updateDeclExports(
const tracy = trace(@src());
defer tracy.end();
try self.global_symbols.ensureUnusedCapacity(self.base.allocator, exports.len);
const decl = module.declPtr(decl_index);
if (decl.link.elf.local_sym_index == 0) return;
const decl_sym = self.local_symbols.items[decl.link.elf.local_sym_index];
const atom = &decl.link.elf;
const decl_ptr = self.decls.getPtr(decl_index).?;
if (decl_ptr.* == null) {
decl_ptr.* = try self.getDeclPhdrIndex(decl);
if (atom.getSymbolIndex() == null) return;
const decl_sym = atom.getSymbol(self);
try self.global_symbols.ensureUnusedCapacity(self.base.allocator, exports.len);
const gop = try self.decls.getOrPut(self.base.allocator, decl_index);
if (!gop.found_existing) {
gop.value_ptr.* = try self.getDeclPhdrIndex(decl);
}
const phdr_index = decl_ptr.*.?;
const phdr_index = gop.value_ptr.*.?;
const shdr_index = self.phdr_shdr_table.get(phdr_index).?;
for (exports) |exp| {

52
src/link/Elf/Atom.zig
View File

@ -1,6 +1,8 @@
const Atom = @This();
const std = @import("std");
const assert = std.debug.assert;
const elf = std.elf;
const Dwarf = @import("../Dwarf.zig");
const Elf = @import("../Elf.zig");
@ -12,8 +14,10 @@ const Elf = @import("../Elf.zig");
/// If this field is 0, it means the codegen size = 0 and there is no symbol or
/// offset table entry.
local_sym_index: u32,
/// This field is undefined for symbols with size = 0.
offset_table_index: u32,
/// Points to the previous and next neighbors, based on the `text_offset`.
/// This can be used to find, for example, the capacity of this `TextBlock`.
prev: ?*Atom,
@ -29,13 +33,49 @@ pub const empty = Atom{
.dbg_info_atom = undefined,
};
pub fn ensureInitialized(self: *Atom, elf_file: *Elf) !void {
if (self.getSymbolIndex() != null) return; // Already initialized
self.local_sym_index = try elf_file.allocateLocalSymbol();
self.offset_table_index = try elf_file.allocateGotOffset();
try elf_file.atom_by_index_table.putNoClobber(elf_file.base.allocator, self.local_sym_index, self);
}
pub fn getSymbolIndex(self: Atom) ?u32 {
if (self.local_sym_index == 0) return null;
return self.local_sym_index;
}
pub fn getSymbol(self: Atom, elf_file: *Elf) elf.Elf64_Sym {
const sym_index = self.getSymbolIndex().?;
return elf_file.local_symbols.items[sym_index];
}
pub fn getSymbolPtr(self: Atom, elf_file: *Elf) *elf.Elf64_Sym {
const sym_index = self.getSymbolIndex().?;
return &elf_file.local_symbols.items[sym_index];
}
pub fn getName(self: Atom, elf_file: *Elf) []const u8 {
const sym = self.getSymbol();
return elf_file.getString(sym.st_name);
}
pub fn getOffsetTableAddress(self: Atom, elf_file: *Elf) u64 {
assert(self.getSymbolIndex() != null);
const target = elf_file.base.options.target;
const ptr_bits = target.cpu.arch.ptrBitWidth();
const ptr_bytes: u64 = @divExact(ptr_bits, 8);
const got = elf_file.program_headers.items[elf_file.phdr_got_index.?];
return got.p_vaddr + self.offset_table_index * ptr_bytes;
}
/// Returns how much room there is to grow in virtual address space.
/// File offset relocation happens transparently, so it is not included in
/// this calculation.
pub fn capacity(self: Atom, elf_file: Elf) u64 {
const self_sym = elf_file.local_symbols.items[self.local_sym_index];
pub fn capacity(self: Atom, elf_file: *Elf) u64 {
const self_sym = self.getSymbol(elf_file);
if (self.next) |next| {
const next_sym = elf_file.local_symbols.items[next.local_sym_index];
const next_sym = next.getSymbol(elf_file);
return next_sym.st_value - self_sym.st_value;
} else {
// We are the last block. The capacity is limited only by virtual address space.
@ -43,11 +83,11 @@ pub fn capacity(self: Atom, elf_file: Elf) u64 {
}
}
pub fn freeListEligible(self: Atom, elf_file: Elf) bool {
pub fn freeListEligible(self: Atom, elf_file: *Elf) bool {
// No need to keep a free list node for the last block.
const next = self.next orelse return false;
const self_sym = elf_file.local_symbols.items[self.local_sym_index];
const next_sym = elf_file.local_symbols.items[next.local_sym_index];
const self_sym = self.getSymbol(elf_file);
const next_sym = next.getSymbol(elf_file);
const cap = next_sym.st_value - self_sym.st_value;
const ideal_cap = Elf.padToIdeal(self_sym.st_size);
if (cap <= ideal_cap) return false;

7
src/link/MachO.zig
View File

@ -2472,14 +2472,15 @@ pub fn updateDeclExports(
const decl = module.declPtr(decl_index);
const atom = &decl.link.macho;
try atom.ensureInitialized(self);
if (atom.getSymbolIndex() == null) return;
const gop = try self.decls.getOrPut(gpa, decl_index);
if (!gop.found_existing) {
gop.value_ptr.* = null;
gop.value_ptr.* = self.getDeclOutputSection(decl);
}
const decl_sym = decl.link.macho.getSymbol(self);
const decl_sym = atom.getSymbol(self);
for (exports) |exp| {
const exp_name = try std.fmt.allocPrint(gpa, "_{s}", .{exp.options.name});