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stage2 cbe: implement not and some bitwise ops

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This commit is contained in:
Veikka Tuominen 2021-01-27 12:22:38 +02:00
parent 106520329e
commit 3ec5c9a3bc
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GPG Key ID: 59AEB8936E16A6AC
2 changed files with 29 additions and 2 deletions
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24
src/codegen/c.zig
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@ -293,6 +293,7 @@ pub const DeclGen = struct {
try dg.renderType(w, t.elemType());
try w.writeAll(" *");
},
.Null, .Undefined => unreachable, // must be const or comptime
else => |e| return dg.fail(dg.decl.src(), "TODO: C backend: implement type {s}", .{
@tagName(e),
}),
@ -387,6 +388,7 @@ pub fn genBody(o: *Object, body: ir.Body) error{ AnalysisFail, OutOfMemory }!voi
for (body.instructions) |inst| {
const result_value = switch (inst.tag) {
.constant => unreachable, // excluded from function bodies
.add => try genBinOp(o, inst.castTag(.add).?, " + "),
.alloc => try genAlloc(o, inst.castTag(.alloc).?),
.arg => genArg(o),
@ -415,8 +417,10 @@ pub fn genBody(o: *Object, body: ir.Body) error{ AnalysisFail, OutOfMemory }!voi
.brvoid => try genBrVoid(o, inst.castTag(.brvoid).?.block),
.switchbr => try genSwitchBr(o, inst.castTag(.switchbr).?),
// booland and boolor are non-short-circuit operations
.booland => try genBinOp(o, inst.castTag(.booland).?, " & "),
.boolor => try genBinOp(o, inst.castTag(.boolor).?, " | "),
.booland, .bitand => try genBinOp(o, inst.castTag(.booland).?, " & "),
.boolor, .bitor => try genBinOp(o, inst.castTag(.boolor).?, " | "),
.xor => try genBinOp(o, inst.castTag(.xor).?, " ^ "),
.not => try genUnOp(o, inst.castTag(.not).?, "!"),
else => |e| return o.dg.fail(o.dg.decl.src(), "TODO: C backend: implement codegen for {}", .{e}),
};
switch (result_value) {
@ -541,6 +545,22 @@ fn genBinOp(o: *Object, inst: *Inst.BinOp, operator: []const u8) !CValue {
return local;
}
fn genUnOp(o: *Object, inst: *Inst.UnOp, operator: []const u8) !CValue {
if (inst.base.isUnused())
return CValue.none;
const operand = try o.resolveInst(inst.operand);
const writer = o.writer();
const local = try o.allocLocal(inst.base.ty, .Const);
try writer.print(" = {s}", .{operator});
try o.writeCValue(writer, operand);
try writer.writeAll(";\n");
return local;
}
fn genCall(o: *Object, inst: *Inst.Call) !CValue {
if (inst.func.castTag(.constant)) |func_inst| {
const fn_decl = if (func_inst.val.castTag(.extern_fn)) |extern_fn|

7
test/stage2/cbe.zig
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@ -196,6 +196,13 @@ pub fn addCases(ctx: *TestContext) !void {
\\ return a - 5;
\\}
, "");
case.addCompareOutput(
\\export fn main() c_int {
\\ var a = true;
\\ while (!a) {}
\\ return 0;
\\}
, "");
// If expression
case.addCompareOutput(