authorgravatar for joachim.schmidt557@outlook.comJoachim Schmidt <joachim.schmidt557@outlook.com> 2021-04-09 18:02:22+02:00
committergravatar for joachim.schmidt557@outlook.comJoachim Schmidt <joachim.schmidt557@outlook.com> 2021-04-11 10:19:35+02:00
loga6ddc12b33d4df48670e7752228b4257933d79c7
tree4fb3967674127f86afac0850a319839ee0cb62ac
parentc676c21824bd8866a2aea56aa11aeade00595ab0
signaturelock-open Commit is signed but in an unrecognized format.

stage2 codegen: Set MCValue of register arguments to their stack copy

1 files changed, 53 insertions(+), 27 deletions(-)

src/codegen.zig+53-27
......@@ -1681,22 +1681,34 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
16811681
16821682 switch (mcv) {
16831683 .register => |reg| {
1684 // Copy arg to stack for better debugging
1685 const ty = inst.base.ty;
1686 const abi_size = math.cast(u32, ty.abiSize(self.target.*)) catch {
1687 return self.fail(inst.base.src, "type '{}' too big to fit into stack frame", .{ty});
1688 };
1689 const abi_align = ty.abiAlignment(self.target.*);
1690 const stack_offset = try self.allocMem(&inst.base, abi_size, abi_align);
1691 try self.genSetStack(inst.base.src, ty, stack_offset, MCValue{ .register = reg });
1692 const adjusted_stack_offset = math.negateCast(stack_offset + abi_size) catch {
1693 return self.fail(inst.base.src, "Stack offset too large for arguments", .{});
1694 };
1695
1684 switch (self.debug_output) {
1685 .dwarf => |dbg_out| {
1686 try dbg_out.dbg_info.ensureCapacity(dbg_out.dbg_info.items.len + 3);
1687 dbg_out.dbg_info.appendAssumeCapacity(link.File.Elf.abbrev_parameter);
1688 dbg_out.dbg_info.appendSliceAssumeCapacity(&[2]u8{ // DW.AT_location, DW.FORM_exprloc
1689 1, // ULEB128 dwarf expression length
1690 reg.dwarfLocOp(),
1691 });
1692 try dbg_out.dbg_info.ensureCapacity(dbg_out.dbg_info.items.len + 5 + name_with_null.len);
1693 try self.addDbgInfoTypeReloc(inst.base.ty); // DW.AT_type, DW.FORM_ref4
1694 dbg_out.dbg_info.appendSliceAssumeCapacity(name_with_null); // DW.AT_name, DW.FORM_string
1695 },
1696 .none => {},
1697 }
1698 },
1699 .stack_offset => |offset| {
16961700 switch (self.debug_output) {
16971701 .dwarf => |dbg_out| {
16981702 switch (arch) {
16991703 .arm, .armeb => {
1704 const ty = inst.base.ty;
1705 const abi_size = math.cast(u32, ty.abiSize(self.target.*)) catch {
1706 return self.fail(inst.base.src, "type '{}' too big to fit into stack frame", .{ty});
1707 };
1708 const adjusted_stack_offset = math.negateCast(offset + abi_size) catch {
1709 return self.fail(inst.base.src, "Stack offset too large for arguments", .{});
1710 };
1711
17001712 try dbg_out.dbg_info.append(link.File.Elf.abbrev_parameter);
17011713
17021714 // Get length of the LEB128 stack offset
......@@ -1708,19 +1720,13 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
17081720 try leb128.writeULEB128(dbg_out.dbg_info.writer(), counting_writer.bytes_written + 1);
17091721 try dbg_out.dbg_info.append(DW.OP_breg11);
17101722 try leb128.writeILEB128(dbg_out.dbg_info.writer(), adjusted_stack_offset);
1723
1724 try dbg_out.dbg_info.ensureCapacity(dbg_out.dbg_info.items.len + 5 + name_with_null.len);
1725 try self.addDbgInfoTypeReloc(inst.base.ty); // DW.AT_type, DW.FORM_ref4
1726 dbg_out.dbg_info.appendSliceAssumeCapacity(name_with_null); // DW.AT_name, DW.FORM_string
17111727 },
1712 else => {
1713 try dbg_out.dbg_info.ensureCapacity(dbg_out.dbg_info.items.len + 3);
1714 dbg_out.dbg_info.appendAssumeCapacity(link.File.Elf.abbrev_parameter);
1715 dbg_out.dbg_info.appendSliceAssumeCapacity(&[2]u8{ // DW.AT_location, DW.FORM_exprloc
1716 1, // ULEB128 dwarf expression length
1717 reg.dwarfLocOp(),
1718 });
1719 },
1728 else => {},
17201729 }
1721 try dbg_out.dbg_info.ensureCapacity(dbg_out.dbg_info.items.len + 5 + name_with_null.len);
1722 try self.addDbgInfoTypeReloc(inst.base.ty); // DW.AT_type, DW.FORM_ref4
1723 dbg_out.dbg_info.appendSliceAssumeCapacity(name_with_null); // DW.AT_name, DW.FORM_string
17241730 },
17251731 .none => {},
17261732 }
......@@ -1738,19 +1744,39 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
17381744 }
17391745
17401746 const result = self.args[arg_index];
1741 try self.genArgDbgInfo(inst, result);
1747 const mcv = switch (arch) {
1748 // TODO support stack-only registers on all target architectures
1749 .arm, .armeb, .aarch64, .aarch64_32, .aarch64_be => switch (result) {
1750 // Copy registers to the stack
1751 .register => |reg| blk: {
1752 const ty = inst.base.ty;
1753 const abi_size = math.cast(u32, ty.abiSize(self.target.*)) catch {
1754 return self.fail(inst.base.src, "type '{}' too big to fit into stack frame", .{ty});
1755 };
1756 const abi_align = ty.abiAlignment(self.target.*);
1757 const stack_offset = try self.allocMem(&inst.base, abi_size, abi_align);
1758 try self.genSetStack(inst.base.src, ty, stack_offset, MCValue{ .register = reg });
1759
1760 break :blk MCValue{ .stack_offset = stack_offset };
1761 },
1762 else => result,
1763 },
1764 else => result,
1765 };
1766 try self.genArgDbgInfo(inst, mcv);
17421767
17431768 if (inst.base.isUnused())
17441769 return MCValue.dead;
17451770
1746 switch (result) {
1771 switch (mcv) {
17471772 .register => |reg| {
17481773 try self.register_manager.registers.ensureCapacity(self.gpa, self.register_manager.registers.count() + 1);
17491774 self.register_manager.getRegAssumeFree(toCanonicalReg(reg), &inst.base);
17501775 },
17511776 else => {},
17521777 }
1753 return result;
1778
1779 return mcv;
17541780 }
17551781
17561782 fn genBreakpoint(self: *Self, src: LazySrcLoc) !MCValue {
......@@ -2257,7 +2283,7 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
22572283 const rhs = try self.resolveInst(inst.rhs);
22582284
22592285 const src_mcv = rhs;
2260 const dst_mcv = if (lhs != .register) try self.copyToNewRegister(&inst.base, lhs) else lhs;
2286 const dst_mcv = if (lhs != .register) try self.copyToNewRegister(inst.lhs, lhs) else lhs;
22612287
22622288 try self.genArmBinOpCode(inst.base.src, dst_mcv.register, dst_mcv, src_mcv, .cmp_eq);
22632289 const info = inst.lhs.ty.intInfo(self.target.*);