diff options
Diffstat (limited to 'src/arch/aarch64/CodeGen.zig')
| -rw-r--r-- | src/arch/aarch64/CodeGen.zig | 210 |
1 files changed, 201 insertions, 9 deletions
diff --git a/src/arch/aarch64/CodeGen.zig b/src/arch/aarch64/CodeGen.zig index b68ae283b5..63be9a2220 100644 --- a/src/arch/aarch64/CodeGen.zig +++ b/src/arch/aarch64/CodeGen.zig @@ -166,10 +166,12 @@ const MCValue = union(enum) { /// the type is u1) or true (if the type in bool) iff the /// specified condition is true. condition_flags: Condition, + /// The value is a function argument passed via the stack. + stack_argument_offset: u32, fn isMemory(mcv: MCValue) bool { return switch (mcv) { - .memory, .stack_offset => true, + .memory, .stack_offset, .stack_argument_offset => true, else => false, }; } @@ -192,6 +194,7 @@ const MCValue = union(enum) { .condition_flags, .ptr_stack_offset, .undef, + .stack_argument_offset, => false, .register, @@ -337,6 +340,7 @@ pub fn generate( .prev_di_line = module_fn.lbrace_line, .prev_di_column = module_fn.lbrace_column, .stack_size = mem.alignForwardGeneric(u32, function.max_end_stack, function.stack_align), + .prologue_stack_space = call_info.stack_byte_count + function.saved_regs_stack_space, }; defer emit.deinit(); @@ -2726,6 +2730,7 @@ fn load(self: *Self, dst_mcv: MCValue, ptr: MCValue, ptr_ty: Type) InnerError!vo }, .memory, .stack_offset, + .stack_argument_offset, .got_load, .direct_load, => { @@ -2927,6 +2932,7 @@ fn store(self: *Self, ptr: MCValue, value: MCValue, ptr_ty: Type, value_ty: Type }, .memory, .stack_offset, + .stack_argument_offset, .got_load, .direct_load, => { @@ -3009,6 +3015,9 @@ fn airStructFieldVal(self: *Self, inst: Air.Inst.Index) !void { switch (mcv) { .dead, .unreach => unreachable, + .stack_argument_offset => |off| { + break :result MCValue{ .stack_argument_offset = off - struct_field_offset }; + }, .stack_offset => |off| { break :result MCValue{ .stack_offset = off - struct_field_offset }; }, @@ -3152,12 +3161,12 @@ fn airCall(self: *Self, inst: Air.Inst.Index, modifier: std.builtin.CallOptions. try self.register_manager.getReg(reg, null); try self.genSetReg(arg_ty, reg, arg_mcv); }, - .stack_offset => { - return self.fail("TODO implement calling with parameters in memory", .{}); - }, - .ptr_stack_offset => { - return self.fail("TODO implement calling with MCValue.ptr_stack_offset arg", .{}); - }, + .stack_offset => unreachable, + .stack_argument_offset => |offset| try self.genSetStackArgument( + arg_ty, + info.stack_byte_count - offset, + arg_mcv, + ), else => unreachable, } } @@ -3884,7 +3893,7 @@ fn br(self: *Self, block: Air.Inst.Index, operand: Air.Inst.Ref) !void { block_data.mcv = switch (operand_mcv) { .none, .dead, .unreach => unreachable, .register, .stack_offset, .memory => operand_mcv, - .immediate, .condition_flags => blk: { + .immediate, .stack_argument_offset, .condition_flags => blk: { const new_mcv = try self.allocRegOrMem(block, true); try self.setRegOrMem(self.air.typeOfIndex(block), new_mcv, operand_mcv); break :blk new_mcv; @@ -4126,6 +4135,7 @@ fn genSetStack(self: *Self, ty: Type, stack_offset: u32, mcv: MCValue) InnerErro .got_load, .direct_load, .memory, + .stack_argument_offset, .stack_offset, => { switch (mcv) { @@ -4328,6 +4338,188 @@ fn genSetReg(self: *Self, ty: Type, reg: Register, mcv: MCValue) InnerError!void else => unreachable, } }, + .stack_argument_offset => |off| { + const abi_size = ty.abiSize(self.target.*); + + switch (abi_size) { + 1, 2, 4, 8 => { + const tag: Mir.Inst.Tag = switch (abi_size) { + 1 => if (ty.isSignedInt()) Mir.Inst.Tag.ldrsb_stack_argument else .ldrb_stack_argument, + 2 => if (ty.isSignedInt()) Mir.Inst.Tag.ldrsh_stack_argument else .ldrh_stack_argument, + 4, 8 => .ldr_stack_argument, + else => unreachable, // unexpected abi size + }; + + _ = try self.addInst(.{ + .tag = tag, + .data = .{ .load_store_stack = .{ + .rt = reg, + .offset = @intCast(u32, off), + } }, + }); + }, + 3, 5, 6, 7 => return self.fail("TODO implement genSetReg types size {}", .{abi_size}), + else => unreachable, + } + }, + } +} + +fn genSetStackArgument(self: *Self, ty: Type, stack_offset: u32, mcv: MCValue) InnerError!void { + const abi_size = @intCast(u32, ty.abiSize(self.target.*)); + switch (mcv) { + .dead => unreachable, + .none, .unreach => return, + .undef => { + if (!self.wantSafety()) + return; // The already existing value will do just fine. + // TODO Upgrade this to a memset call when we have that available. + switch (ty.abiSize(self.target.*)) { + 1 => return self.genSetStack(ty, stack_offset, .{ .immediate = 0xaa }), + 2 => return self.genSetStack(ty, stack_offset, .{ .immediate = 0xaaaa }), + 4 => return self.genSetStack(ty, stack_offset, .{ .immediate = 0xaaaaaaaa }), + 8 => return self.genSetStack(ty, stack_offset, .{ .immediate = 0xaaaaaaaaaaaaaaaa }), + else => return self.fail("TODO implement memset", .{}), + } + }, + .register => |reg| { + switch (abi_size) { + 1, 2, 4, 8 => { + const tag: Mir.Inst.Tag = switch (abi_size) { + 1 => .strb_immediate, + 2 => .strh_immediate, + 4, 8 => .str_immediate, + else => unreachable, // unexpected abi size + }; + const rt = registerAlias(reg, abi_size); + const offset = switch (abi_size) { + 1 => blk: { + if (math.cast(u12, stack_offset)) |imm| { + break :blk Instruction.LoadStoreOffset.imm(imm); + } else { + return self.fail("TODO genSetStackArgument byte with larger offset", .{}); + } + }, + 2 => blk: { + assert(std.mem.isAlignedGeneric(u32, stack_offset, 2)); // misaligned stack entry + if (math.cast(u12, @divExact(stack_offset, 2))) |imm| { + break :blk Instruction.LoadStoreOffset.imm(imm); + } else { + return self.fail("TODO getSetStackArgument halfword with larger offset", .{}); + } + }, + 4, 8 => blk: { + const alignment = abi_size; + assert(std.mem.isAlignedGeneric(u32, stack_offset, alignment)); // misaligned stack entry + if (math.cast(u12, @divExact(stack_offset, alignment))) |imm| { + break :blk Instruction.LoadStoreOffset.imm(imm); + } else { + return self.fail("TODO genSetStackArgument with larger offset", .{}); + } + }, + else => unreachable, + }; + + _ = try self.addInst(.{ + .tag = tag, + .data = .{ .load_store_register_immediate = .{ + .rt = rt, + .rn = .sp, + .offset = offset.immediate, + } }, + }); + }, + else => return self.fail("TODO genSetStackArgument other types abi_size={}", .{abi_size}), + } + }, + .register_with_overflow => { + return self.fail("TODO implement genSetStack {}", .{mcv}); + }, + .got_load, + .direct_load, + .memory, + .stack_argument_offset, + .stack_offset, + => { + if (abi_size <= 4) { + const reg = try self.copyToTmpRegister(ty, mcv); + return self.genSetStackArgument(ty, stack_offset, MCValue{ .register = reg }); + } else { + var ptr_ty_payload: Type.Payload.ElemType = .{ + .base = .{ .tag = .single_mut_pointer }, + .data = ty, + }; + const ptr_ty = Type.initPayload(&ptr_ty_payload.base); + + // TODO call extern memcpy + const regs = try self.register_manager.allocRegs(5, .{ null, null, null, null, null }, gp); + const regs_locks = self.register_manager.lockRegsAssumeUnused(5, regs); + defer for (regs_locks) |reg| { + self.register_manager.unlockReg(reg); + }; + + const src_reg = regs[0]; + const dst_reg = regs[1]; + const len_reg = regs[2]; + const count_reg = regs[3]; + const tmp_reg = regs[4]; + + switch (mcv) { + .stack_offset => |off| { + // sub src_reg, fp, #off + try self.genSetReg(ptr_ty, src_reg, .{ .ptr_stack_offset = off }); + }, + .memory => |addr| try self.genSetReg(ptr_ty, src_reg, .{ .immediate = @intCast(u32, addr) }), + .got_load, + .direct_load, + => |sym_index| { + const tag: Mir.Inst.Tag = switch (mcv) { + .got_load => .load_memory_ptr_got, + .direct_load => .load_memory_ptr_direct, + else => unreachable, + }; + const mod = self.bin_file.options.module.?; + _ = try self.addInst(.{ + .tag = tag, + .data = .{ + .payload = try self.addExtra(Mir.LoadMemoryPie{ + .register = @enumToInt(src_reg), + .atom_index = mod.declPtr(self.mod_fn.owner_decl).link.macho.sym_index, + .sym_index = sym_index, + }), + }, + }); + }, + .stack_argument_offset => return self.fail("TODO load {}", .{mcv}), + else => unreachable, + } + + // add dst_reg, sp, #stack_offset + _ = try self.addInst(.{ + .tag = .add_immediate, + .data = .{ .rr_imm12_sh = .{ + .rd = dst_reg, + .rn = .sp, + .imm12 = math.cast(u12, stack_offset) orelse { + return self.fail("TODO load: set reg to stack offset with all possible offsets", .{}); + }, + } }, + }); + + // mov len, #abi_size + try self.genSetReg(Type.usize, len_reg, .{ .immediate = abi_size }); + + // memcpy(src, dst, len) + try self.genInlineMemcpy(src_reg, dst_reg, len_reg, count_reg, tmp_reg); + } + }, + .condition_flags, + .immediate, + .ptr_stack_offset, + => { + const reg = try self.copyToTmpRegister(ty, mcv); + return self.genSetStackArgument(ty, stack_offset, MCValue{ .register = reg }); + }, } } @@ -4835,8 +5027,8 @@ fn resolveCallingConventionValues(self: *Self, fn_ty: Type) !CallMCValues { } } - result.args[i] = .{ .stack_offset = nsaa }; nsaa += param_size; + result.args[i] = .{ .stack_argument_offset = nsaa }; } } |