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stage2: codegen: more branching support

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This commit is contained in:
Andrew Kelley
2020-07-12 23:12:41 -07:00
parent b75a51f94b
commit c306392b44
1 changed files with 11 additions and 3 deletions
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14
src-self-hosted/codegen.zig
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@@ -780,14 +780,22 @@ const Function = struct {
}
fn genBr(self: *Function, inst: *ir.Inst.Br, comptime arch: std.Target.Cpu.Arch) !MCValue {
if (!inst.args.operand.ty.hasCodeGenBits())
return self.brVoid(inst.base.src, inst.args.block, arch);
const operand = try self.resolveInst(inst.args.operand);
switch (arch) {
else => return self.fail(inst.base.src, "TODO implement br for {}", .{self.target.cpu.arch}),
}
}
fn genBrVoid(self: *Function, inst: *ir.Inst.BrVoid, comptime arch: std.Target.Cpu.Arch) !MCValue {
return self.brVoid(inst.base.src, inst.args.block, arch);
}
fn brVoid(self: *Function, src: usize, block: *ir.Inst.Block, comptime arch: std.Target.Cpu.Arch) !MCValue {
// Emit a jump with a relocation. It will be patched up after the block ends.
try inst.args.block.codegen.relocs.ensureCapacity(self.gpa, inst.args.block.codegen.relocs.items.len + 1);
try block.codegen.relocs.ensureCapacity(self.gpa, block.codegen.relocs.items.len + 1);
switch (arch) {
.i386, .x86_64 => {
@@ -796,9 +804,9 @@ const Function = struct {
try self.code.resize(self.code.items.len + 5);
self.code.items[self.code.items.len - 5] = 0xe9; // jmp rel32
// Leave the jump offset undefined
inst.args.block.codegen.relocs.appendAssumeCapacity(.{ .rel32 = self.code.items.len - 4 });
block.codegen.relocs.appendAssumeCapacity(.{ .rel32 = self.code.items.len - 4 });
},
else => return self.fail(inst.base.src, "TODO implement brvoid for {}", .{self.target.cpu.arch}),
else => return self.fail(src, "TODO implement brvoid for {}", .{self.target.cpu.arch}),
}
return .none;
}