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stage2: lay the groundwork in prep for extern fn

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This commit lays the groundwork in preparation for implementing
handling of extern functions in various backends.
This commit is contained in:
Jakub Konka
2021-01-08 23:16:50 +01:00
committed by Andrew Kelley
parent a021c7b1b2
commit 5487dd13ea
6 changed files with 74 additions and 6 deletions
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12
src/codegen.zig
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@@ -1602,6 +1602,8 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
try self.code.ensureCapacity(self.code.items.len + 7);
self.code.appendSliceAssumeCapacity(&[3]u8{ 0xff, 0x14, 0x25 });
mem.writeIntLittle(u32, self.code.addManyAsArrayAssumeCapacity(4), got_addr);
} else if (func_value.castTag(.extern_fn)) |_| {
return self.fail(inst.base.src, "TODO implement calling extern functions", .{});
} else {
return self.fail(inst.base.src, "TODO implement calling bitcasted functions", .{});
}
@@ -1628,6 +1630,8 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
try self.genSetReg(inst.base.src, .ra, .{ .memory = got_addr });
mem.writeIntLittle(u32, try self.code.addManyAsArray(4), Instruction.jalr(.ra, 0, .ra).toU32());
} else if (func_value.castTag(.extern_fn)) |_| {
return self.fail(inst.base.src, "TODO implement calling extern functions", .{});
} else {
return self.fail(inst.base.src, "TODO implement calling bitcasted functions", .{});
}
@@ -1672,6 +1676,8 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
else => return self.fail(inst.base.src, "TODO implement fn call with non-void return value", .{}),
}
}
} else if (func_value.castTag(.extern_fn)) |_| {
return self.fail(inst.base.src, "TODO implement calling extern functions", .{});
} else {
return self.fail(inst.base.src, "TODO implement calling bitcasted functions", .{});
}
@@ -1733,6 +1739,8 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
writeInt(u32, try self.code.addManyAsArray(4), Instruction.mov(.al, .lr, Instruction.Operand.reg(.pc, Instruction.Operand.Shift.none)).toU32());
writeInt(u32, try self.code.addManyAsArray(4), Instruction.bx(.al, .lr).toU32());
}
} else if (func_value.castTag(.extern_fn)) |_| {
return self.fail(inst.base.src, "TODO implement calling extern functions", .{});
} else {
return self.fail(inst.base.src, "TODO implement calling bitcasted functions", .{});
}
@@ -1787,6 +1795,8 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
try self.genSetReg(inst.base.src, .x30, .{ .memory = got_addr });
writeInt(u32, try self.code.addManyAsArray(4), Instruction.blr(.x30).toU32());
} else if (func_value.castTag(.extern_fn)) |_| {
return self.fail(inst.base.src, "TODO implement calling extern functions", .{});
} else {
return self.fail(inst.base.src, "TODO implement calling bitcasted functions", .{});
}
@@ -1849,6 +1859,8 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
},
else => unreachable, // unsupported architecture on MachO
}
} else if (func_value.castTag(.extern_fn)) |_| {
return self.fail(inst.base.src, "TODO implement calling extern functions", .{});
} else {
return self.fail(inst.base.src, "TODO implement calling bitcasted functions", .{});
}