mirror/zig
1
0
Fork 0
mirror of https://github.com/ziglang/zig.git synced 2025-12-24 15:13:08 +00:00
Code Issues Packages Projects Releases Wiki Activity

stage2 aarch64: add genCall for aarch64 MachO

Browse Source
This commit is contained in:
Jakub Konka 2020-11-11 12:09:39 +01:00
parent 993eb22a77
commit a6bc19ea2a
1 changed files with 50 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

97
src/codegen.zig
View File

@ -1643,61 +1643,64 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
else => return self.fail(inst.base.src, "TODO implement call for {}", .{self.target.cpu.arch}),
}
} else if (self.bin_file.cast(link.File.MachO)) |macho_file| {
switch (arch) {
.x86_64 => {
for (info.args) |mc_arg, arg_i| {
const arg = inst.args[arg_i];
const arg_mcv = try self.resolveInst(inst.args[arg_i]);
// Here we do not use setRegOrMem even though the logic is similar, because
// the function call will move the stack pointer, so the offsets are different.
switch (mc_arg) {
.none => continue,
.register => |reg| {
try self.genSetReg(arg.src, reg, arg_mcv);
// TODO interact with the register allocator to mark the instruction as moved.
},
.stack_offset => {
// Here we need to emit instructions like this:
// mov qword ptr [rsp + stack_offset], x
return self.fail(inst.base.src, "TODO implement calling with parameters in memory", .{});
},
.ptr_stack_offset => {
return self.fail(inst.base.src, "TODO implement calling with MCValue.ptr_stack_offset arg", .{});
},
.ptr_embedded_in_code => {
return self.fail(inst.base.src, "TODO implement calling with MCValue.ptr_embedded_in_code arg", .{});
},
.undef => unreachable,
.immediate => unreachable,
.unreach => unreachable,
.dead => unreachable,
.embedded_in_code => unreachable,
.memory => unreachable,
.compare_flags_signed => unreachable,
.compare_flags_unsigned => unreachable,
}
}
for (info.args) |mc_arg, arg_i| {
const arg = inst.args[arg_i];
const arg_mcv = try self.resolveInst(inst.args[arg_i]);
// Here we do not use setRegOrMem even though the logic is similar, because
// the function call will move the stack pointer, so the offsets are different.
switch (mc_arg) {
.none => continue,
.register => |reg| {
try self.genSetReg(arg.src, reg, arg_mcv);
// TODO interact with the register allocator to mark the instruction as moved.
},
.stack_offset => {
// Here we need to emit instructions like this:
// mov qword ptr [rsp + stack_offset], x
return self.fail(inst.base.src, "TODO implement calling with parameters in memory", .{});
},
.ptr_stack_offset => {
return self.fail(inst.base.src, "TODO implement calling with MCValue.ptr_stack_offset arg", .{});
},
.ptr_embedded_in_code => {
return self.fail(inst.base.src, "TODO implement calling with MCValue.ptr_embedded_in_code arg", .{});
},
.undef => unreachable,
.immediate => unreachable,
.unreach => unreachable,
.dead => unreachable,
.embedded_in_code => unreachable,
.memory => unreachable,
.compare_flags_signed => unreachable,
.compare_flags_unsigned => unreachable,
}
}
if (inst.func.cast(ir.Inst.Constant)) |func_inst| {
if (func_inst.val.cast(Value.Payload.Function)) |func_val| {
const func = func_val.func;
const got = &macho_file.sections.items[macho_file.got_section_index.?];
const got_addr = got.addr + func.owner_decl.link.macho.offset_table_index * @sizeOf(u64);
if (inst.func.cast(ir.Inst.Constant)) |func_inst| {
if (func_inst.val.cast(Value.Payload.Function)) |func_val| {
const func = func_val.func;
const got = &macho_file.sections.items[macho_file.got_section_index.?];
const got_addr = got.addr + func.owner_decl.link.macho.offset_table_index * @sizeOf(u64);
switch (arch) {
.x86_64 => {
// Here, we store the got address in %rax, and then call %rax
// movabsq [addr], %rax
try self.genSetReg(inst.base.src, .rax, .{ .memory = got_addr });
// callq *%rax
try self.code.ensureCapacity(self.code.items.len + 2);
self.code.appendSliceAssumeCapacity(&[2]u8{ 0xff, 0xd0 });
} else {
return self.fail(inst.base.src, "TODO implement calling bitcasted functions", .{});
}
} else {
return self.fail(inst.base.src, "TODO implement calling runtime known function pointer", .{});
},
.aarch64 => {
try self.genSetReg(inst.base.src, .x30, .{ .memory = got_addr });
writeInt(u32, try self.code.addManyAsArray(4), Instruction.blr(.x30).toU32());
},
else => unreachable, // unsupported architecture on MachO
}
},
.aarch64 => return self.fail(inst.base.src, "TODO implement codegen for call when linking with MachO for aarch64 arch", .{}),
else => unreachable,
} else {
return self.fail(inst.base.src, "TODO implement calling bitcasted functions", .{});
}
} else {
return self.fail(inst.base.src, "TODO implement calling runtime known function pointer", .{});
}
} else {
unreachable;