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stage2: C backend: implement support for switch_br AIR

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Andrew Kelley 2021-07-20 15:52:58 -07:00
parent fe14e33945
commit 9c652cc650
1 changed files with 27 additions and 21 deletions
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48
src/codegen/c.zig
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@ -1275,7 +1275,7 @@ fn airCall(o: *Object, inst: Air.Inst.Index) !CValue {
fn airDbgStmt(o: *Object, inst: Air.Inst.Index) !CValue {
const dbg_stmt = o.air.instructions.items(.data)[inst].dbg_stmt;
const writer = o.writer();
try writer.print("#line {d}\n", .{dbg_stmt.line});
try writer.print("#line {d}\n", .{dbg_stmt.line + 1});
return CValue.none;
}
@ -1403,35 +1403,41 @@ fn airSwitchBr(o: *Object, inst: Air.Inst.Index) !CValue {
const pl_op = o.air.instructions.items(.data)[inst].pl_op;
const condition = try o.resolveInst(pl_op.operand);
const condition_ty = o.air.typeOf(pl_op.operand);
const switch_br = o.air.extraData(Air.SwitchBr, pl_op.payload);
const writer = o.writer();
try writer.writeAll("switch (");
try o.writeCValue(writer, condition);
try writer.writeAll(") {\n");
try writer.writeAll(") {");
o.indent_writer.pushIndent();
// Need to rework Sema so that multiple cases are represented rather than
// getting branching logic inside the else, this way we get multiple case
// labels here rather than logic in the default case.
_ = condition_ty;
return o.dg.fail("TODO implement switch in C backend", .{});
var extra_index: usize = switch_br.end;
var case_i: u32 = 0;
while (case_i < switch_br.data.cases_len) : (case_i += 1) {
const case = o.air.extraData(Air.SwitchBr.Case, extra_index);
const items = @bitCast([]const Air.Inst.Ref, o.air.extra[case.end..][0..case.data.items_len]);
const case_body = o.air.extra[case.end + items.len ..][0..case.data.body_len];
extra_index = case.end + case.data.items_len + case_body.len;
//for (inst.cases) |case| {
// try writer.writeAll("case ");
// try o.dg.renderValue(writer, condition_ty, case.item);
// try writer.writeAll(": ");
// // the case body must be noreturn so we don't need to insert a break
// try genBody(o, case.body);
// try o.indent_writer.insertNewline();
//}
for (items) |item| {
try o.indent_writer.insertNewline();
try writer.writeAll("case ");
try o.dg.renderValue(writer, condition_ty, o.air.value(item).?);
try writer.writeAll(": ");
}
// The case body must be noreturn so we don't need to insert a break.
try genBody(o, case_body);
}
//try writer.writeAll("default: ");
//try genBody(o, inst.else_body);
//try o.indent_writer.insertNewline();
const else_body = o.air.extra[extra_index..][0..switch_br.data.else_body_len];
try o.indent_writer.insertNewline();
try writer.writeAll("default: ");
try genBody(o, else_body);
try o.indent_writer.insertNewline();
//o.indent_writer.popIndent();
//try writer.writeAll("}\n");
//return CValue.none;
o.indent_writer.popIndent();
try writer.writeAll("}\n");
return CValue.none;
}
fn airAsm(o: *Object, inst: Air.Inst.Index) !CValue {