mirror of
https://codeberg.org/ziglang/zig.git
synced 2025-12-06 13:54:21 +00:00
c04be630d9
Each target can opt into different sets of legalize features. By performing these transformations before liveness, instructions that become unreferenced will have up-to-date liveness information.
1087 lines
46 KiB
Zig
1087 lines
46 KiB
Zig
const std = @import("std");
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const build_options = @import("build_options");
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const builtin = @import("builtin");
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const assert = std.debug.assert;
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const link = @import("link.zig");
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const log = std.log.scoped(.codegen);
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const mem = std.mem;
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const math = std.math;
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const target_util = @import("target.zig");
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const trace = @import("tracy.zig").trace;
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const Air = @import("Air.zig");
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const Allocator = mem.Allocator;
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const Compilation = @import("Compilation.zig");
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const ErrorMsg = Zcu.ErrorMsg;
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const InternPool = @import("InternPool.zig");
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const Zcu = @import("Zcu.zig");
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const Type = @import("Type.zig");
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const Value = @import("Value.zig");
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const Zir = std.zig.Zir;
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const Alignment = InternPool.Alignment;
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const dev = @import("dev.zig");
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pub const CodeGenError = GenerateSymbolError || error{
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/// Indicates the error is already stored in Zcu `failed_codegen`.
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CodegenFail,
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};
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fn devFeatureForBackend(comptime backend: std.builtin.CompilerBackend) dev.Feature {
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comptime assert(mem.startsWith(u8, @tagName(backend), "stage2_"));
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return @field(dev.Feature, @tagName(backend)["stage2_".len..] ++ "_backend");
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}
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pub fn importBackend(comptime backend: std.builtin.CompilerBackend) ?type {
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return switch (backend) {
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.stage2_aarch64 => @import("arch/aarch64/CodeGen.zig"),
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.stage2_arm => @import("arch/arm/CodeGen.zig"),
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.stage2_c => @import("codegen/c.zig"),
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.stage2_llvm => @import("codegen/llvm.zig"),
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.stage2_powerpc => @import("arch/powerpc/CodeGen.zig"),
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.stage2_riscv64 => @import("arch/riscv64/CodeGen.zig"),
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.stage2_sparc64 => @import("arch/sparc64/CodeGen.zig"),
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.stage2_spirv64 => @import("codegen/spirv.zig"),
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.stage2_x86_64 => @import("arch/x86_64/CodeGen.zig"),
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else => null,
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};
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}
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pub fn generateFunction(
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lf: *link.File,
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pt: Zcu.PerThread,
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src_loc: Zcu.LazySrcLoc,
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func_index: InternPool.Index,
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air: Air,
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liveness: Air.Liveness,
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code: *std.ArrayListUnmanaged(u8),
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debug_output: link.File.DebugInfoOutput,
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) CodeGenError!void {
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const zcu = pt.zcu;
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const func = zcu.funcInfo(func_index);
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const target = zcu.navFileScope(func.owner_nav).mod.?.resolved_target.result;
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switch (target_util.zigBackend(target, false)) {
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else => unreachable,
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inline .stage2_aarch64,
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.stage2_arm,
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.stage2_powerpc,
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.stage2_riscv64,
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.stage2_sparc64,
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.stage2_x86_64,
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=> |backend| {
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dev.check(devFeatureForBackend(backend));
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return importBackend(backend).?.generate(lf, pt, src_loc, func_index, air, liveness, code, debug_output);
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},
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}
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}
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pub fn generateLazyFunction(
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lf: *link.File,
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pt: Zcu.PerThread,
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src_loc: Zcu.LazySrcLoc,
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lazy_sym: link.File.LazySymbol,
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code: *std.ArrayListUnmanaged(u8),
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debug_output: link.File.DebugInfoOutput,
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) CodeGenError!void {
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const zcu = pt.zcu;
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const target = if (Type.fromInterned(lazy_sym.ty).typeDeclInstAllowGeneratedTag(zcu)) |inst_index|
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zcu.fileByIndex(inst_index.resolveFile(&zcu.intern_pool)).mod.?.resolved_target.result
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else
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zcu.getTarget();
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switch (target_util.zigBackend(target, false)) {
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else => unreachable,
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inline .stage2_powerpc,
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.stage2_riscv64,
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.stage2_x86_64,
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=> |backend| {
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dev.check(devFeatureForBackend(backend));
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return importBackend(backend).?.generateLazy(lf, pt, src_loc, lazy_sym, code, debug_output);
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},
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}
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}
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fn writeFloat(comptime F: type, f: F, target: std.Target, endian: std.builtin.Endian, code: []u8) void {
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_ = target;
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const bits = @typeInfo(F).float.bits;
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const Int = @Type(.{ .int = .{ .signedness = .unsigned, .bits = bits } });
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const int: Int = @bitCast(f);
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mem.writeInt(Int, code[0..@divExact(bits, 8)], int, endian);
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}
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pub fn generateLazySymbol(
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bin_file: *link.File,
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pt: Zcu.PerThread,
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src_loc: Zcu.LazySrcLoc,
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lazy_sym: link.File.LazySymbol,
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// TODO don't use an "out" parameter like this; put it in the result instead
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alignment: *Alignment,
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code: *std.ArrayListUnmanaged(u8),
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debug_output: link.File.DebugInfoOutput,
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reloc_parent: link.File.RelocInfo.Parent,
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) CodeGenError!void {
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_ = reloc_parent;
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const tracy = trace(@src());
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defer tracy.end();
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const comp = bin_file.comp;
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const gpa = comp.gpa;
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const zcu = pt.zcu;
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const ip = &zcu.intern_pool;
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const target = comp.root_mod.resolved_target.result;
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const endian = target.cpu.arch.endian();
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log.debug("generateLazySymbol: kind = {s}, ty = {}", .{
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@tagName(lazy_sym.kind),
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Type.fromInterned(lazy_sym.ty).fmt(pt),
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});
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if (lazy_sym.kind == .code) {
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alignment.* = target_util.defaultFunctionAlignment(target);
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return generateLazyFunction(bin_file, pt, src_loc, lazy_sym, code, debug_output);
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}
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if (lazy_sym.ty == .anyerror_type) {
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alignment.* = .@"4";
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const err_names = ip.global_error_set.getNamesFromMainThread();
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var offset_index: u32 = @intCast(code.items.len);
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var string_index: u32 = @intCast(4 * (1 + err_names.len + @intFromBool(err_names.len > 0)));
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try code.resize(gpa, offset_index + string_index);
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mem.writeInt(u32, code.items[offset_index..][0..4], @intCast(err_names.len), endian);
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if (err_names.len == 0) return;
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offset_index += 4;
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for (err_names) |err_name_nts| {
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const err_name = err_name_nts.toSlice(ip);
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mem.writeInt(u32, code.items[offset_index..][0..4], string_index, endian);
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offset_index += 4;
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try code.ensureUnusedCapacity(gpa, err_name.len + 1);
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code.appendSliceAssumeCapacity(err_name);
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code.appendAssumeCapacity(0);
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string_index += @intCast(err_name.len + 1);
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}
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mem.writeInt(u32, code.items[offset_index..][0..4], string_index, endian);
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} else if (Type.fromInterned(lazy_sym.ty).zigTypeTag(zcu) == .@"enum") {
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alignment.* = .@"1";
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const enum_ty = Type.fromInterned(lazy_sym.ty);
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const tag_names = enum_ty.enumFields(zcu);
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for (0..tag_names.len) |tag_index| {
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const tag_name = tag_names.get(ip)[tag_index].toSlice(ip);
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try code.ensureUnusedCapacity(gpa, tag_name.len + 1);
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code.appendSliceAssumeCapacity(tag_name);
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code.appendAssumeCapacity(0);
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}
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} else {
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return zcu.codegenFailType(lazy_sym.ty, "TODO implement generateLazySymbol for {s} {}", .{
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@tagName(lazy_sym.kind), Type.fromInterned(lazy_sym.ty).fmt(pt),
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});
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}
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}
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pub const GenerateSymbolError = error{
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OutOfMemory,
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/// Compiler was asked to operate on a number larger than supported.
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Overflow,
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/// Compiler was asked to produce a non-byte-aligned relocation.
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RelocationNotByteAligned,
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};
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pub fn generateSymbol(
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bin_file: *link.File,
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pt: Zcu.PerThread,
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src_loc: Zcu.LazySrcLoc,
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val: Value,
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code: *std.ArrayListUnmanaged(u8),
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reloc_parent: link.File.RelocInfo.Parent,
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) GenerateSymbolError!void {
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const tracy = trace(@src());
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defer tracy.end();
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const zcu = pt.zcu;
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const gpa = zcu.gpa;
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const ip = &zcu.intern_pool;
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const ty = val.typeOf(zcu);
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const target = zcu.getTarget();
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const endian = target.cpu.arch.endian();
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log.debug("generateSymbol: val = {}", .{val.fmtValue(pt)});
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if (val.isUndefDeep(zcu)) {
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const abi_size = math.cast(usize, ty.abiSize(zcu)) orelse return error.Overflow;
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try code.appendNTimes(gpa, 0xaa, abi_size);
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return;
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}
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switch (ip.indexToKey(val.toIntern())) {
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.int_type,
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.ptr_type,
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.array_type,
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.vector_type,
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.opt_type,
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.anyframe_type,
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.error_union_type,
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.simple_type,
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.struct_type,
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.tuple_type,
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.union_type,
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.opaque_type,
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.enum_type,
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.func_type,
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.error_set_type,
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.inferred_error_set_type,
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=> unreachable, // types, not values
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.undef => unreachable, // handled above
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.simple_value => |simple_value| switch (simple_value) {
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.undefined => unreachable, // non-runtime value
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.void => unreachable, // non-runtime value
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.null => unreachable, // non-runtime value
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.@"unreachable" => unreachable, // non-runtime value
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.empty_tuple => return,
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.false, .true => try code.append(gpa, switch (simple_value) {
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.false => 0,
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.true => 1,
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else => unreachable,
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}),
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},
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.variable,
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.@"extern",
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.func,
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.enum_literal,
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.empty_enum_value,
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=> unreachable, // non-runtime values
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.int => {
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const abi_size = math.cast(usize, ty.abiSize(zcu)) orelse return error.Overflow;
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var space: Value.BigIntSpace = undefined;
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const int_val = val.toBigInt(&space, zcu);
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int_val.writeTwosComplement(try code.addManyAsSlice(gpa, abi_size), endian);
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},
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.err => |err| {
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const int = try pt.getErrorValue(err.name);
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try code.writer(gpa).writeInt(u16, @intCast(int), endian);
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},
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.error_union => |error_union| {
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const payload_ty = ty.errorUnionPayload(zcu);
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const err_val: u16 = switch (error_union.val) {
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.err_name => |err_name| @intCast(try pt.getErrorValue(err_name)),
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.payload => 0,
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};
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if (!payload_ty.hasRuntimeBitsIgnoreComptime(zcu)) {
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try code.writer(gpa).writeInt(u16, err_val, endian);
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return;
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}
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const payload_align = payload_ty.abiAlignment(zcu);
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const error_align = Type.anyerror.abiAlignment(zcu);
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const abi_align = ty.abiAlignment(zcu);
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// error value first when its type is larger than the error union's payload
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if (error_align.order(payload_align) == .gt) {
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try code.writer(gpa).writeInt(u16, err_val, endian);
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}
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// emit payload part of the error union
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{
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const begin = code.items.len;
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try generateSymbol(bin_file, pt, src_loc, Value.fromInterned(switch (error_union.val) {
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.err_name => try pt.intern(.{ .undef = payload_ty.toIntern() }),
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.payload => |payload| payload,
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}), code, reloc_parent);
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const unpadded_end = code.items.len - begin;
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const padded_end = abi_align.forward(unpadded_end);
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const padding = math.cast(usize, padded_end - unpadded_end) orelse return error.Overflow;
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if (padding > 0) {
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try code.appendNTimes(gpa, 0, padding);
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}
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}
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// Payload size is larger than error set, so emit our error set last
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if (error_align.compare(.lte, payload_align)) {
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const begin = code.items.len;
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try code.writer(gpa).writeInt(u16, err_val, endian);
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const unpadded_end = code.items.len - begin;
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const padded_end = abi_align.forward(unpadded_end);
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const padding = math.cast(usize, padded_end - unpadded_end) orelse return error.Overflow;
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if (padding > 0) {
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try code.appendNTimes(gpa, 0, padding);
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}
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}
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},
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.enum_tag => |enum_tag| {
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const int_tag_ty = ty.intTagType(zcu);
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try generateSymbol(bin_file, pt, src_loc, try pt.getCoerced(Value.fromInterned(enum_tag.int), int_tag_ty), code, reloc_parent);
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},
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.float => |float| switch (float.storage) {
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.f16 => |f16_val| writeFloat(f16, f16_val, target, endian, try code.addManyAsArray(gpa, 2)),
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.f32 => |f32_val| writeFloat(f32, f32_val, target, endian, try code.addManyAsArray(gpa, 4)),
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.f64 => |f64_val| writeFloat(f64, f64_val, target, endian, try code.addManyAsArray(gpa, 8)),
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.f80 => |f80_val| {
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writeFloat(f80, f80_val, target, endian, try code.addManyAsArray(gpa, 10));
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const abi_size = math.cast(usize, ty.abiSize(zcu)) orelse return error.Overflow;
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try code.appendNTimes(gpa, 0, abi_size - 10);
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},
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.f128 => |f128_val| writeFloat(f128, f128_val, target, endian, try code.addManyAsArray(gpa, 16)),
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},
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.ptr => try lowerPtr(bin_file, pt, src_loc, val.toIntern(), code, reloc_parent, 0),
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.slice => |slice| {
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try generateSymbol(bin_file, pt, src_loc, Value.fromInterned(slice.ptr), code, reloc_parent);
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try generateSymbol(bin_file, pt, src_loc, Value.fromInterned(slice.len), code, reloc_parent);
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},
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.opt => {
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const payload_type = ty.optionalChild(zcu);
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const payload_val = val.optionalValue(zcu);
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const abi_size = math.cast(usize, ty.abiSize(zcu)) orelse return error.Overflow;
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if (ty.optionalReprIsPayload(zcu)) {
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if (payload_val) |value| {
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try generateSymbol(bin_file, pt, src_loc, value, code, reloc_parent);
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} else {
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try code.appendNTimes(gpa, 0, abi_size);
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}
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} else {
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const padding = abi_size - (math.cast(usize, payload_type.abiSize(zcu)) orelse return error.Overflow) - 1;
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if (payload_type.hasRuntimeBits(zcu)) {
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const value = payload_val orelse Value.fromInterned(try pt.intern(.{
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.undef = payload_type.toIntern(),
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}));
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try generateSymbol(bin_file, pt, src_loc, value, code, reloc_parent);
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}
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try code.writer(gpa).writeByte(@intFromBool(payload_val != null));
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try code.appendNTimes(gpa, 0, padding);
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}
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},
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.aggregate => |aggregate| switch (ip.indexToKey(ty.toIntern())) {
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.array_type => |array_type| switch (aggregate.storage) {
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.bytes => |bytes| try code.appendSlice(gpa, bytes.toSlice(array_type.lenIncludingSentinel(), ip)),
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.elems, .repeated_elem => {
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var index: u64 = 0;
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while (index < array_type.lenIncludingSentinel()) : (index += 1) {
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try generateSymbol(bin_file, pt, src_loc, Value.fromInterned(switch (aggregate.storage) {
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.bytes => unreachable,
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.elems => |elems| elems[@intCast(index)],
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.repeated_elem => |elem| if (index < array_type.len)
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elem
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else
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array_type.sentinel,
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}), code, reloc_parent);
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}
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},
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},
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.vector_type => |vector_type| {
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const abi_size = math.cast(usize, ty.abiSize(zcu)) orelse return error.Overflow;
|
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if (vector_type.child == .bool_type) {
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const bytes = try code.addManyAsSlice(gpa, abi_size);
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@memset(bytes, 0xaa);
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var index: usize = 0;
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const len = math.cast(usize, vector_type.len) orelse return error.Overflow;
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while (index < len) : (index += 1) {
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const bit_index = switch (endian) {
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.big => len - 1 - index,
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.little => index,
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};
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const byte = &bytes[bit_index / 8];
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const mask = @as(u8, 1) << @truncate(bit_index);
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if (switch (switch (aggregate.storage) {
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.bytes => unreachable,
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.elems => |elems| elems[index],
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.repeated_elem => |elem| elem,
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|
}) {
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|
.bool_true => true,
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|
.bool_false => false,
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else => |elem| switch (ip.indexToKey(elem)) {
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.undef => continue,
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|
.int => |int| switch (int.storage) {
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.u64 => |x| switch (x) {
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0 => false,
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|
1 => true,
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else => unreachable,
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},
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|
.i64 => |x| switch (x) {
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-1 => true,
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0 => false,
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|
else => unreachable,
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},
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else => unreachable,
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},
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else => unreachable,
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},
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}) byte.* |= mask else byte.* &= ~mask;
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}
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} else {
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switch (aggregate.storage) {
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.bytes => |bytes| try code.appendSlice(gpa, bytes.toSlice(vector_type.len, ip)),
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.elems, .repeated_elem => {
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var index: u64 = 0;
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while (index < vector_type.len) : (index += 1) {
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try generateSymbol(bin_file, pt, src_loc, Value.fromInterned(switch (aggregate.storage) {
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|
.bytes => unreachable,
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.elems => |elems| elems[
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math.cast(usize, index) orelse return error.Overflow
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],
|
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.repeated_elem => |elem| elem,
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}), code, reloc_parent);
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}
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},
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}
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|
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const padding = abi_size -
|
|
(math.cast(usize, Type.fromInterned(vector_type.child).abiSize(zcu) * vector_type.len) orelse
|
|
return error.Overflow);
|
|
if (padding > 0) try code.appendNTimes(gpa, 0, padding);
|
|
}
|
|
},
|
|
.tuple_type => |tuple| {
|
|
const struct_begin = code.items.len;
|
|
for (
|
|
tuple.types.get(ip),
|
|
tuple.values.get(ip),
|
|
0..,
|
|
) |field_ty, comptime_val, index| {
|
|
if (comptime_val != .none) continue;
|
|
if (!Type.fromInterned(field_ty).hasRuntimeBits(zcu)) continue;
|
|
|
|
const field_val = switch (aggregate.storage) {
|
|
.bytes => |bytes| try pt.intern(.{ .int = .{
|
|
.ty = field_ty,
|
|
.storage = .{ .u64 = bytes.at(index, ip) },
|
|
} }),
|
|
.elems => |elems| elems[index],
|
|
.repeated_elem => |elem| elem,
|
|
};
|
|
|
|
try generateSymbol(bin_file, pt, src_loc, Value.fromInterned(field_val), code, reloc_parent);
|
|
const unpadded_field_end = code.items.len - struct_begin;
|
|
|
|
// Pad struct members if required
|
|
const padded_field_end = ty.structFieldOffset(index + 1, zcu);
|
|
const padding = math.cast(usize, padded_field_end - unpadded_field_end) orelse
|
|
return error.Overflow;
|
|
|
|
if (padding > 0) {
|
|
try code.appendNTimes(gpa, 0, padding);
|
|
}
|
|
}
|
|
},
|
|
.struct_type => {
|
|
const struct_type = ip.loadStructType(ty.toIntern());
|
|
switch (struct_type.layout) {
|
|
.@"packed" => {
|
|
const abi_size = math.cast(usize, ty.abiSize(zcu)) orelse return error.Overflow;
|
|
const current_pos = code.items.len;
|
|
try code.appendNTimes(gpa, 0, abi_size);
|
|
var bits: u16 = 0;
|
|
|
|
for (struct_type.field_types.get(ip), 0..) |field_ty, index| {
|
|
const field_val = switch (aggregate.storage) {
|
|
.bytes => |bytes| try pt.intern(.{ .int = .{
|
|
.ty = field_ty,
|
|
.storage = .{ .u64 = bytes.at(index, ip) },
|
|
} }),
|
|
.elems => |elems| elems[index],
|
|
.repeated_elem => |elem| elem,
|
|
};
|
|
|
|
// pointer may point to a decl which must be marked used
|
|
// but can also result in a relocation. Therefore we handle those separately.
|
|
if (Type.fromInterned(field_ty).zigTypeTag(zcu) == .pointer) {
|
|
const field_offset = std.math.divExact(u16, bits, 8) catch |err| switch (err) {
|
|
error.DivisionByZero => unreachable,
|
|
error.UnexpectedRemainder => return error.RelocationNotByteAligned,
|
|
};
|
|
code.items.len = current_pos + field_offset;
|
|
// TODO: code.lockPointers();
|
|
defer {
|
|
assert(code.items.len == current_pos + field_offset + @divExact(target.ptrBitWidth(), 8));
|
|
// TODO: code.unlockPointers();
|
|
code.items.len = current_pos + abi_size;
|
|
}
|
|
try generateSymbol(bin_file, pt, src_loc, Value.fromInterned(field_val), code, reloc_parent);
|
|
} else {
|
|
Value.fromInterned(field_val).writeToPackedMemory(Type.fromInterned(field_ty), pt, code.items[current_pos..], bits) catch unreachable;
|
|
}
|
|
bits += @intCast(Type.fromInterned(field_ty).bitSize(zcu));
|
|
}
|
|
},
|
|
.auto, .@"extern" => {
|
|
const struct_begin = code.items.len;
|
|
const field_types = struct_type.field_types.get(ip);
|
|
const offsets = struct_type.offsets.get(ip);
|
|
|
|
var it = struct_type.iterateRuntimeOrder(ip);
|
|
while (it.next()) |field_index| {
|
|
const field_ty = field_types[field_index];
|
|
if (!Type.fromInterned(field_ty).hasRuntimeBits(zcu)) continue;
|
|
|
|
const field_val = switch (ip.indexToKey(val.toIntern()).aggregate.storage) {
|
|
.bytes => |bytes| try pt.intern(.{ .int = .{
|
|
.ty = field_ty,
|
|
.storage = .{ .u64 = bytes.at(field_index, ip) },
|
|
} }),
|
|
.elems => |elems| elems[field_index],
|
|
.repeated_elem => |elem| elem,
|
|
};
|
|
|
|
const padding = math.cast(
|
|
usize,
|
|
offsets[field_index] - (code.items.len - struct_begin),
|
|
) orelse return error.Overflow;
|
|
if (padding > 0) try code.appendNTimes(gpa, 0, padding);
|
|
|
|
try generateSymbol(bin_file, pt, src_loc, Value.fromInterned(field_val), code, reloc_parent);
|
|
}
|
|
|
|
const size = struct_type.sizeUnordered(ip);
|
|
const alignment = struct_type.flagsUnordered(ip).alignment.toByteUnits().?;
|
|
|
|
const padding = math.cast(
|
|
usize,
|
|
std.mem.alignForward(u64, size, @max(alignment, 1)) -
|
|
(code.items.len - struct_begin),
|
|
) orelse return error.Overflow;
|
|
if (padding > 0) try code.appendNTimes(gpa, 0, padding);
|
|
},
|
|
}
|
|
},
|
|
else => unreachable,
|
|
},
|
|
.un => |un| {
|
|
const layout = ty.unionGetLayout(zcu);
|
|
|
|
if (layout.payload_size == 0) {
|
|
return generateSymbol(bin_file, pt, src_loc, Value.fromInterned(un.tag), code, reloc_parent);
|
|
}
|
|
|
|
// Check if we should store the tag first.
|
|
if (layout.tag_size > 0 and layout.tag_align.compare(.gte, layout.payload_align)) {
|
|
try generateSymbol(bin_file, pt, src_loc, Value.fromInterned(un.tag), code, reloc_parent);
|
|
}
|
|
|
|
const union_obj = zcu.typeToUnion(ty).?;
|
|
if (un.tag != .none) {
|
|
const field_index = ty.unionTagFieldIndex(Value.fromInterned(un.tag), zcu).?;
|
|
const field_ty = Type.fromInterned(union_obj.field_types.get(ip)[field_index]);
|
|
if (!field_ty.hasRuntimeBits(zcu)) {
|
|
try code.appendNTimes(gpa, 0xaa, math.cast(usize, layout.payload_size) orelse return error.Overflow);
|
|
} else {
|
|
try generateSymbol(bin_file, pt, src_loc, Value.fromInterned(un.val), code, reloc_parent);
|
|
|
|
const padding = math.cast(usize, layout.payload_size - field_ty.abiSize(zcu)) orelse return error.Overflow;
|
|
if (padding > 0) {
|
|
try code.appendNTimes(gpa, 0, padding);
|
|
}
|
|
}
|
|
} else {
|
|
try generateSymbol(bin_file, pt, src_loc, Value.fromInterned(un.val), code, reloc_parent);
|
|
}
|
|
|
|
if (layout.tag_size > 0 and layout.tag_align.compare(.lt, layout.payload_align)) {
|
|
try generateSymbol(bin_file, pt, src_loc, Value.fromInterned(un.tag), code, reloc_parent);
|
|
|
|
if (layout.padding > 0) {
|
|
try code.appendNTimes(gpa, 0, layout.padding);
|
|
}
|
|
}
|
|
},
|
|
.memoized_call => unreachable,
|
|
}
|
|
}
|
|
|
|
fn lowerPtr(
|
|
bin_file: *link.File,
|
|
pt: Zcu.PerThread,
|
|
src_loc: Zcu.LazySrcLoc,
|
|
ptr_val: InternPool.Index,
|
|
code: *std.ArrayListUnmanaged(u8),
|
|
reloc_parent: link.File.RelocInfo.Parent,
|
|
prev_offset: u64,
|
|
) GenerateSymbolError!void {
|
|
const zcu = pt.zcu;
|
|
const ptr = zcu.intern_pool.indexToKey(ptr_val).ptr;
|
|
const offset: u64 = prev_offset + ptr.byte_offset;
|
|
return switch (ptr.base_addr) {
|
|
.nav => |nav| try lowerNavRef(bin_file, pt, nav, code, reloc_parent, offset),
|
|
.uav => |uav| try lowerUavRef(bin_file, pt, src_loc, uav, code, reloc_parent, offset),
|
|
.int => try generateSymbol(bin_file, pt, src_loc, try pt.intValue(Type.usize, offset), code, reloc_parent),
|
|
.eu_payload => |eu_ptr| try lowerPtr(
|
|
bin_file,
|
|
pt,
|
|
src_loc,
|
|
eu_ptr,
|
|
code,
|
|
reloc_parent,
|
|
offset + errUnionPayloadOffset(
|
|
Value.fromInterned(eu_ptr).typeOf(zcu).childType(zcu).errorUnionPayload(zcu),
|
|
zcu,
|
|
),
|
|
),
|
|
.opt_payload => |opt_ptr| try lowerPtr(bin_file, pt, src_loc, opt_ptr, code, reloc_parent, offset),
|
|
.field => |field| {
|
|
const base_ptr = Value.fromInterned(field.base);
|
|
const base_ty = base_ptr.typeOf(zcu).childType(zcu);
|
|
const field_off: u64 = switch (base_ty.zigTypeTag(zcu)) {
|
|
.pointer => off: {
|
|
assert(base_ty.isSlice(zcu));
|
|
break :off switch (field.index) {
|
|
Value.slice_ptr_index => 0,
|
|
Value.slice_len_index => @divExact(zcu.getTarget().ptrBitWidth(), 8),
|
|
else => unreachable,
|
|
};
|
|
},
|
|
.@"struct", .@"union" => switch (base_ty.containerLayout(zcu)) {
|
|
.auto => base_ty.structFieldOffset(@intCast(field.index), zcu),
|
|
.@"extern", .@"packed" => unreachable,
|
|
},
|
|
else => unreachable,
|
|
};
|
|
return lowerPtr(bin_file, pt, src_loc, field.base, code, reloc_parent, offset + field_off);
|
|
},
|
|
.arr_elem, .comptime_field, .comptime_alloc => unreachable,
|
|
};
|
|
}
|
|
|
|
fn lowerUavRef(
|
|
lf: *link.File,
|
|
pt: Zcu.PerThread,
|
|
src_loc: Zcu.LazySrcLoc,
|
|
uav: InternPool.Key.Ptr.BaseAddr.Uav,
|
|
code: *std.ArrayListUnmanaged(u8),
|
|
reloc_parent: link.File.RelocInfo.Parent,
|
|
offset: u64,
|
|
) GenerateSymbolError!void {
|
|
const zcu = pt.zcu;
|
|
const gpa = zcu.gpa;
|
|
const ip = &zcu.intern_pool;
|
|
const comp = lf.comp;
|
|
const target = &comp.root_mod.resolved_target.result;
|
|
const ptr_width_bytes = @divExact(target.ptrBitWidth(), 8);
|
|
const is_obj = comp.config.output_mode == .Obj;
|
|
const uav_val = uav.val;
|
|
const uav_ty = Type.fromInterned(ip.typeOf(uav_val));
|
|
const is_fn_body = uav_ty.zigTypeTag(zcu) == .@"fn";
|
|
|
|
log.debug("lowerUavRef: ty = {}", .{uav_ty.fmt(pt)});
|
|
try code.ensureUnusedCapacity(gpa, ptr_width_bytes);
|
|
|
|
if (!is_fn_body and !uav_ty.hasRuntimeBits(zcu)) {
|
|
code.appendNTimesAssumeCapacity(0xaa, ptr_width_bytes);
|
|
return;
|
|
}
|
|
|
|
switch (lf.tag) {
|
|
.c => unreachable,
|
|
.spirv => unreachable,
|
|
.wasm => {
|
|
dev.check(link.File.Tag.wasm.devFeature());
|
|
const wasm = lf.cast(.wasm).?;
|
|
assert(reloc_parent == .none);
|
|
if (is_obj) {
|
|
try wasm.out_relocs.append(gpa, .{
|
|
.offset = @intCast(code.items.len),
|
|
.pointee = .{ .symbol_index = try wasm.uavSymbolIndex(uav.val) },
|
|
.tag = if (ptr_width_bytes == 4) .memory_addr_i32 else .memory_addr_i64,
|
|
.addend = @intCast(offset),
|
|
});
|
|
} else {
|
|
try wasm.uav_fixups.ensureUnusedCapacity(gpa, 1);
|
|
wasm.uav_fixups.appendAssumeCapacity(.{
|
|
.uavs_exe_index = try wasm.refUavExe(uav.val, uav.orig_ty),
|
|
.offset = @intCast(code.items.len),
|
|
.addend = @intCast(offset),
|
|
});
|
|
}
|
|
code.appendNTimesAssumeCapacity(0, ptr_width_bytes);
|
|
return;
|
|
},
|
|
else => {},
|
|
}
|
|
|
|
const uav_align = ip.indexToKey(uav.orig_ty).ptr_type.flags.alignment;
|
|
switch (try lf.lowerUav(pt, uav_val, uav_align, src_loc)) {
|
|
.mcv => {},
|
|
.fail => |em| std.debug.panic("TODO rework lowerUav. internal error: {s}", .{em.msg}),
|
|
}
|
|
|
|
const vaddr = try lf.getUavVAddr(uav_val, .{
|
|
.parent = reloc_parent,
|
|
.offset = code.items.len,
|
|
.addend = @intCast(offset),
|
|
});
|
|
const endian = target.cpu.arch.endian();
|
|
switch (ptr_width_bytes) {
|
|
2 => mem.writeInt(u16, code.addManyAsArrayAssumeCapacity(2), @intCast(vaddr), endian),
|
|
4 => mem.writeInt(u32, code.addManyAsArrayAssumeCapacity(4), @intCast(vaddr), endian),
|
|
8 => mem.writeInt(u64, code.addManyAsArrayAssumeCapacity(8), vaddr, endian),
|
|
else => unreachable,
|
|
}
|
|
}
|
|
|
|
fn lowerNavRef(
|
|
lf: *link.File,
|
|
pt: Zcu.PerThread,
|
|
nav_index: InternPool.Nav.Index,
|
|
code: *std.ArrayListUnmanaged(u8),
|
|
reloc_parent: link.File.RelocInfo.Parent,
|
|
offset: u64,
|
|
) GenerateSymbolError!void {
|
|
const zcu = pt.zcu;
|
|
const gpa = zcu.gpa;
|
|
const ip = &zcu.intern_pool;
|
|
const target = zcu.navFileScope(nav_index).mod.?.resolved_target.result;
|
|
const ptr_width_bytes = @divExact(target.ptrBitWidth(), 8);
|
|
const is_obj = lf.comp.config.output_mode == .Obj;
|
|
const nav_ty = Type.fromInterned(ip.getNav(nav_index).typeOf(ip));
|
|
const is_fn_body = nav_ty.zigTypeTag(zcu) == .@"fn";
|
|
|
|
try code.ensureUnusedCapacity(gpa, ptr_width_bytes);
|
|
|
|
if (!is_fn_body and !nav_ty.hasRuntimeBits(zcu)) {
|
|
code.appendNTimesAssumeCapacity(0xaa, ptr_width_bytes);
|
|
return;
|
|
}
|
|
|
|
switch (lf.tag) {
|
|
.c => unreachable,
|
|
.spirv => unreachable,
|
|
.wasm => {
|
|
dev.check(link.File.Tag.wasm.devFeature());
|
|
const wasm = lf.cast(.wasm).?;
|
|
assert(reloc_parent == .none);
|
|
if (is_fn_body) {
|
|
const gop = try wasm.zcu_indirect_function_set.getOrPut(gpa, nav_index);
|
|
if (!gop.found_existing) gop.value_ptr.* = {};
|
|
if (is_obj) {
|
|
@panic("TODO add out_reloc for this");
|
|
} else {
|
|
try wasm.func_table_fixups.append(gpa, .{
|
|
.table_index = @enumFromInt(gop.index),
|
|
.offset = @intCast(code.items.len),
|
|
});
|
|
}
|
|
} else {
|
|
if (is_obj) {
|
|
try wasm.out_relocs.append(gpa, .{
|
|
.offset = @intCast(code.items.len),
|
|
.pointee = .{ .symbol_index = try wasm.navSymbolIndex(nav_index) },
|
|
.tag = if (ptr_width_bytes == 4) .memory_addr_i32 else .memory_addr_i64,
|
|
.addend = @intCast(offset),
|
|
});
|
|
} else {
|
|
try wasm.nav_fixups.ensureUnusedCapacity(gpa, 1);
|
|
wasm.nav_fixups.appendAssumeCapacity(.{
|
|
.navs_exe_index = try wasm.refNavExe(nav_index),
|
|
.offset = @intCast(code.items.len),
|
|
.addend = @intCast(offset),
|
|
});
|
|
}
|
|
}
|
|
code.appendNTimesAssumeCapacity(0, ptr_width_bytes);
|
|
return;
|
|
},
|
|
else => {},
|
|
}
|
|
|
|
const vaddr = lf.getNavVAddr(pt, nav_index, .{
|
|
.parent = reloc_parent,
|
|
.offset = code.items.len,
|
|
.addend = @intCast(offset),
|
|
}) catch @panic("TODO rework getNavVAddr");
|
|
const endian = target.cpu.arch.endian();
|
|
switch (ptr_width_bytes) {
|
|
2 => mem.writeInt(u16, code.addManyAsArrayAssumeCapacity(2), @intCast(vaddr), endian),
|
|
4 => mem.writeInt(u32, code.addManyAsArrayAssumeCapacity(4), @intCast(vaddr), endian),
|
|
8 => mem.writeInt(u64, code.addManyAsArrayAssumeCapacity(8), vaddr, endian),
|
|
else => unreachable,
|
|
}
|
|
}
|
|
|
|
/// Helper struct to denote that the value is in memory but requires a linker relocation fixup:
|
|
/// * got - the value is referenced indirectly via GOT entry index (the linker emits a got-type reloc)
|
|
/// * direct - the value is referenced directly via symbol index index (the linker emits a displacement reloc)
|
|
/// * import - the value is referenced indirectly via import entry index (the linker emits an import-type reloc)
|
|
pub const LinkerLoad = struct {
|
|
type: enum {
|
|
got,
|
|
direct,
|
|
import,
|
|
},
|
|
sym_index: u32,
|
|
};
|
|
|
|
pub const GenResult = union(enum) {
|
|
mcv: MCValue,
|
|
fail: *ErrorMsg,
|
|
|
|
const MCValue = union(enum) {
|
|
none,
|
|
undef,
|
|
/// The bit-width of the immediate may be smaller than `u64`. For example, on 32-bit targets
|
|
/// such as ARM, the immediate will never exceed 32-bits.
|
|
immediate: u64,
|
|
/// Decl with address deferred until the linker allocates everything in virtual memory.
|
|
/// Payload is a symbol index.
|
|
load_direct: u32,
|
|
/// Decl with address deferred until the linker allocates everything in virtual memory.
|
|
/// Payload is a symbol index.
|
|
lea_direct: u32,
|
|
/// Decl referenced via GOT with address deferred until the linker allocates
|
|
/// everything in virtual memory.
|
|
/// Payload is a symbol index.
|
|
load_got: u32,
|
|
/// Direct by-address reference to memory location.
|
|
memory: u64,
|
|
/// Reference to memory location but deferred until linker allocated the Decl in memory.
|
|
/// Traditionally, this corresponds to emitting a relocation in a relocatable object file.
|
|
load_symbol: u32,
|
|
/// Reference to memory location but deferred until linker allocated the Decl in memory.
|
|
/// Traditionally, this corresponds to emitting a relocation in a relocatable object file.
|
|
lea_symbol: u32,
|
|
};
|
|
};
|
|
|
|
fn genNavRef(
|
|
lf: *link.File,
|
|
pt: Zcu.PerThread,
|
|
src_loc: Zcu.LazySrcLoc,
|
|
val: Value,
|
|
nav_index: InternPool.Nav.Index,
|
|
target: std.Target,
|
|
) CodeGenError!GenResult {
|
|
const zcu = pt.zcu;
|
|
const ip = &zcu.intern_pool;
|
|
const ty = val.typeOf(zcu);
|
|
log.debug("genNavRef: val = {}", .{val.fmtValue(pt)});
|
|
|
|
if (!ty.isFnOrHasRuntimeBitsIgnoreComptime(zcu)) {
|
|
const imm: u64 = switch (@divExact(target.ptrBitWidth(), 8)) {
|
|
1 => 0xaa,
|
|
2 => 0xaaaa,
|
|
4 => 0xaaaaaaaa,
|
|
8 => 0xaaaaaaaaaaaaaaaa,
|
|
else => unreachable,
|
|
};
|
|
return .{ .mcv = .{ .immediate = imm } };
|
|
}
|
|
|
|
const comp = lf.comp;
|
|
const gpa = comp.gpa;
|
|
|
|
// TODO this feels clunky. Perhaps we should check for it in `genTypedValue`?
|
|
if (ty.castPtrToFn(zcu)) |fn_ty| {
|
|
if (zcu.typeToFunc(fn_ty).?.is_generic) {
|
|
return .{ .mcv = .{ .immediate = fn_ty.abiAlignment(zcu).toByteUnits().? } };
|
|
}
|
|
} else if (ty.zigTypeTag(zcu) == .pointer) {
|
|
const elem_ty = ty.elemType2(zcu);
|
|
if (!elem_ty.hasRuntimeBits(zcu)) {
|
|
return .{ .mcv = .{ .immediate = elem_ty.abiAlignment(zcu).toByteUnits().? } };
|
|
}
|
|
}
|
|
|
|
const nav = ip.getNav(nav_index);
|
|
assert(!nav.isThreadlocal(ip));
|
|
|
|
const is_extern, const lib_name = if (nav.getExtern(ip)) |e|
|
|
.{ true, e.lib_name }
|
|
else
|
|
.{ false, .none };
|
|
|
|
const name = nav.name;
|
|
if (lf.cast(.elf)) |elf_file| {
|
|
const zo = elf_file.zigObjectPtr().?;
|
|
if (is_extern) {
|
|
const sym_index = try elf_file.getGlobalSymbol(name.toSlice(ip), lib_name.toSlice(ip));
|
|
zo.symbol(sym_index).flags.is_extern_ptr = true;
|
|
return .{ .mcv = .{ .lea_symbol = sym_index } };
|
|
}
|
|
const sym_index = try zo.getOrCreateMetadataForNav(zcu, nav_index);
|
|
return .{ .mcv = .{ .lea_symbol = sym_index } };
|
|
} else if (lf.cast(.macho)) |macho_file| {
|
|
const zo = macho_file.getZigObject().?;
|
|
if (is_extern) {
|
|
const sym_index = try macho_file.getGlobalSymbol(name.toSlice(ip), lib_name.toSlice(ip));
|
|
zo.symbols.items[sym_index].flags.is_extern_ptr = true;
|
|
return .{ .mcv = .{ .lea_symbol = sym_index } };
|
|
}
|
|
const sym_index = try zo.getOrCreateMetadataForNav(macho_file, nav_index);
|
|
const sym = zo.symbols.items[sym_index];
|
|
return .{ .mcv = .{ .lea_symbol = sym.nlist_idx } };
|
|
} else if (lf.cast(.coff)) |coff_file| {
|
|
if (is_extern) {
|
|
// TODO audit this
|
|
const global_index = try coff_file.getGlobalSymbol(name.toSlice(ip), lib_name.toSlice(ip));
|
|
try coff_file.need_got_table.put(gpa, global_index, {}); // needs GOT
|
|
return .{ .mcv = .{ .load_got = link.File.Coff.global_symbol_bit | global_index } };
|
|
}
|
|
const atom_index = try coff_file.getOrCreateAtomForNav(nav_index);
|
|
const sym_index = coff_file.getAtom(atom_index).getSymbolIndex().?;
|
|
return .{ .mcv = .{ .load_got = sym_index } };
|
|
} else if (lf.cast(.plan9)) |p9| {
|
|
const atom_index = try p9.seeNav(pt, nav_index);
|
|
const atom = p9.getAtom(atom_index);
|
|
return .{ .mcv = .{ .memory = atom.getOffsetTableAddress(p9) } };
|
|
} else {
|
|
const msg = try ErrorMsg.create(gpa, src_loc, "TODO genNavRef for target {}", .{target});
|
|
return .{ .fail = msg };
|
|
}
|
|
}
|
|
|
|
pub fn genTypedValue(
|
|
lf: *link.File,
|
|
pt: Zcu.PerThread,
|
|
src_loc: Zcu.LazySrcLoc,
|
|
val: Value,
|
|
target: std.Target,
|
|
) CodeGenError!GenResult {
|
|
const zcu = pt.zcu;
|
|
const ip = &zcu.intern_pool;
|
|
const ty = val.typeOf(zcu);
|
|
|
|
log.debug("genTypedValue: val = {}", .{val.fmtValue(pt)});
|
|
|
|
if (val.isUndef(zcu)) return .{ .mcv = .undef };
|
|
|
|
switch (ty.zigTypeTag(zcu)) {
|
|
.void => return .{ .mcv = .none },
|
|
.pointer => switch (ty.ptrSize(zcu)) {
|
|
.slice => {},
|
|
else => switch (val.toIntern()) {
|
|
.null_value => {
|
|
return .{ .mcv = .{ .immediate = 0 } };
|
|
},
|
|
else => switch (ip.indexToKey(val.toIntern())) {
|
|
.int => {
|
|
return .{ .mcv = .{ .immediate = val.toUnsignedInt(zcu) } };
|
|
},
|
|
.ptr => |ptr| if (ptr.byte_offset == 0) switch (ptr.base_addr) {
|
|
.nav => |nav| return genNavRef(lf, pt, src_loc, val, nav, target),
|
|
.uav => |uav| if (Value.fromInterned(uav.val).typeOf(zcu).hasRuntimeBits(zcu))
|
|
return switch (try lf.lowerUav(
|
|
pt,
|
|
uav.val,
|
|
Type.fromInterned(uav.orig_ty).ptrAlignment(zcu),
|
|
src_loc,
|
|
)) {
|
|
.mcv => |mcv| return .{ .mcv = switch (mcv) {
|
|
.load_direct => |sym_index| .{ .lea_direct = sym_index },
|
|
.load_symbol => |sym_index| .{ .lea_symbol = sym_index },
|
|
else => unreachable,
|
|
} },
|
|
.fail => |em| return .{ .fail = em },
|
|
}
|
|
else
|
|
return .{ .mcv = .{ .immediate = Type.fromInterned(uav.orig_ty).ptrAlignment(zcu)
|
|
.forward(@intCast((@as(u66, 1) << @intCast(target.ptrBitWidth() | 1)) / 3)) } },
|
|
else => {},
|
|
},
|
|
else => {},
|
|
},
|
|
},
|
|
},
|
|
.int => {
|
|
const info = ty.intInfo(zcu);
|
|
if (info.bits <= target.ptrBitWidth()) {
|
|
const unsigned: u64 = switch (info.signedness) {
|
|
.signed => @bitCast(val.toSignedInt(zcu)),
|
|
.unsigned => val.toUnsignedInt(zcu),
|
|
};
|
|
return .{ .mcv = .{ .immediate = unsigned } };
|
|
}
|
|
},
|
|
.bool => {
|
|
return .{ .mcv = .{ .immediate = @intFromBool(val.toBool()) } };
|
|
},
|
|
.optional => {
|
|
if (ty.isPtrLikeOptional(zcu)) {
|
|
return genTypedValue(
|
|
lf,
|
|
pt,
|
|
src_loc,
|
|
val.optionalValue(zcu) orelse return .{ .mcv = .{ .immediate = 0 } },
|
|
target,
|
|
);
|
|
} else if (ty.abiSize(zcu) == 1) {
|
|
return .{ .mcv = .{ .immediate = @intFromBool(!val.isNull(zcu)) } };
|
|
}
|
|
},
|
|
.@"enum" => {
|
|
const enum_tag = ip.indexToKey(val.toIntern()).enum_tag;
|
|
return genTypedValue(
|
|
lf,
|
|
pt,
|
|
src_loc,
|
|
Value.fromInterned(enum_tag.int),
|
|
target,
|
|
);
|
|
},
|
|
.error_set => {
|
|
const err_name = ip.indexToKey(val.toIntern()).err.name;
|
|
const error_index = try pt.getErrorValue(err_name);
|
|
return .{ .mcv = .{ .immediate = error_index } };
|
|
},
|
|
.error_union => {
|
|
const err_type = ty.errorUnionSet(zcu);
|
|
const payload_type = ty.errorUnionPayload(zcu);
|
|
if (!payload_type.hasRuntimeBitsIgnoreComptime(zcu)) {
|
|
// We use the error type directly as the type.
|
|
const err_int_ty = try pt.errorIntType();
|
|
switch (ip.indexToKey(val.toIntern()).error_union.val) {
|
|
.err_name => |err_name| return genTypedValue(
|
|
lf,
|
|
pt,
|
|
src_loc,
|
|
Value.fromInterned(try pt.intern(.{ .err = .{
|
|
.ty = err_type.toIntern(),
|
|
.name = err_name,
|
|
} })),
|
|
target,
|
|
),
|
|
.payload => return genTypedValue(
|
|
lf,
|
|
pt,
|
|
src_loc,
|
|
try pt.intValue(err_int_ty, 0),
|
|
target,
|
|
),
|
|
}
|
|
}
|
|
},
|
|
|
|
.comptime_int => unreachable,
|
|
.comptime_float => unreachable,
|
|
.type => unreachable,
|
|
.enum_literal => unreachable,
|
|
.noreturn => unreachable,
|
|
.undefined => unreachable,
|
|
.null => unreachable,
|
|
.@"opaque" => unreachable,
|
|
|
|
else => {},
|
|
}
|
|
|
|
return lf.lowerUav(pt, val.toIntern(), .none, src_loc);
|
|
}
|
|
|
|
pub fn errUnionPayloadOffset(payload_ty: Type, zcu: *Zcu) u64 {
|
|
if (!payload_ty.hasRuntimeBitsIgnoreComptime(zcu)) return 0;
|
|
const payload_align = payload_ty.abiAlignment(zcu);
|
|
const error_align = Type.anyerror.abiAlignment(zcu);
|
|
if (payload_align.compare(.gte, error_align) or !payload_ty.hasRuntimeBitsIgnoreComptime(zcu)) {
|
|
return 0;
|
|
} else {
|
|
return payload_align.forward(Type.anyerror.abiSize(zcu));
|
|
}
|
|
}
|
|
|
|
pub fn errUnionErrorOffset(payload_ty: Type, zcu: *Zcu) u64 {
|
|
if (!payload_ty.hasRuntimeBitsIgnoreComptime(zcu)) return 0;
|
|
const payload_align = payload_ty.abiAlignment(zcu);
|
|
const error_align = Type.anyerror.abiAlignment(zcu);
|
|
if (payload_align.compare(.gte, error_align) and payload_ty.hasRuntimeBitsIgnoreComptime(zcu)) {
|
|
return error_align.forward(payload_ty.abiSize(zcu));
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|