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Diffstat (limited to 'src/codegen/c.zig')
-rw-r--r--src/codegen/c.zig171
1 files changed, 87 insertions, 84 deletions
diff --git a/src/codegen/c.zig b/src/codegen/c.zig
index 705c5c2ad1..a67e2438c2 100644
--- a/src/codegen/c.zig
+++ b/src/codegen/c.zig
@@ -262,6 +262,7 @@ pub const DeclGen = struct {
.one => try writer.writeAll("1"),
.decl_ref => {
const decl = val.castTag(.decl_ref).?.data;
+ decl.alive = true;
// Determine if we must pointer cast.
assert(decl.has_tv);
@@ -281,36 +282,7 @@ pub const DeclGen = struct {
const decl = val.castTag(.extern_fn).?.data;
try writer.print("{s}", .{decl.name});
},
- else => switch (t.ptrSize()) {
- .Slice => unreachable,
- .Many => {
- if (val.castTag(.ref_val)) |ref_val_payload| {
- const sub_val = ref_val_payload.data;
- if (sub_val.castTag(.bytes)) |bytes_payload| {
- const bytes = bytes_payload.data;
- try writer.writeByte('(');
- try dg.renderType(writer, t);
- // TODO: make our own C string escape instead of using std.zig.fmtEscapes
- try writer.print(")\"{}\"", .{std.zig.fmtEscapes(bytes)});
- } else {
- unreachable;
- }
- } else {
- unreachable;
- }
- },
- .One => {
- var arena = std.heap.ArenaAllocator.init(dg.module.gpa);
- defer arena.deinit();
-
- const elem_ty = t.elemType();
- const elem_val = try val.pointerDeref(&arena.allocator);
-
- try writer.writeAll("&");
- try dg.renderValue(writer, elem_ty, elem_val);
- },
- .C => unreachable,
- },
+ else => unreachable,
},
},
.Array => {
@@ -378,32 +350,25 @@ pub const DeclGen = struct {
.ErrorUnion => {
const error_type = t.errorUnionSet();
const payload_type = t.errorUnionPayload();
- const sub_val = val.castTag(.error_union).?.data;
if (!payload_type.hasCodeGenBits()) {
// We use the error type directly as the type.
- return dg.renderValue(writer, error_type, sub_val);
+ const err_val = if (val.errorUnionIsPayload()) Value.initTag(.zero) else val;
+ return dg.renderValue(writer, error_type, err_val);
}
try writer.writeByte('(');
try dg.renderType(writer, t);
try writer.writeAll("){");
- if (val.getError()) |_| {
- try writer.writeAll(" .error = ");
- try dg.renderValue(
- writer,
- error_type,
- sub_val,
- );
- try writer.writeAll(" }");
- } else {
+ if (val.castTag(.eu_payload)) |pl| {
+ const payload_val = pl.data;
try writer.writeAll(" .payload = ");
- try dg.renderValue(
- writer,
- payload_type,
- sub_val,
- );
+ try dg.renderValue(writer, payload_type, payload_val);
try writer.writeAll(", .error = 0 }");
+ } else {
+ try writer.writeAll(" .error = ");
+ try dg.renderValue(writer, error_type, val);
+ try writer.writeAll(" }");
}
},
.Enum => {
@@ -436,6 +401,7 @@ pub const DeclGen = struct {
.one => try writer.writeAll("1"),
.decl_ref => {
const decl = val.castTag(.decl_ref).?.data;
+ decl.alive = true;
// Determine if we must pointer cast.
assert(decl.has_tv);
@@ -448,11 +414,13 @@ pub const DeclGen = struct {
}
},
.function => {
- const func = val.castTag(.function).?.data;
- try writer.print("{s}", .{func.owner_decl.name});
+ const decl = val.castTag(.function).?.data.owner_decl;
+ decl.alive = true;
+ try writer.print("{s}", .{decl.name});
},
.extern_fn => {
const decl = val.castTag(.extern_fn).?.data;
+ decl.alive = true;
try writer.print("{s}", .{decl.name});
},
else => unreachable,
@@ -875,19 +843,19 @@ fn genBody(o: *Object, body: []const Air.Inst.Index) error{ AnalysisFail, OutOfM
// TODO use a different strategy for add that communicates to the optimizer
// that wrapping is UB.
- .add => try airBinOp( o, inst, " + "),
- .addwrap => try airWrapOp(o, inst, " + ", "addw_"),
+ .add, .ptr_add => try airBinOp( o, inst, " + "),
+ .addwrap => try airWrapOp(o, inst, " + ", "addw_"),
// TODO use a different strategy for sub that communicates to the optimizer
// that wrapping is UB.
- .sub => try airBinOp( o, inst, " - "),
- .subwrap => try airWrapOp(o, inst, " - ", "subw_"),
+ .sub, .ptr_sub => try airBinOp( o, inst, " - "),
+ .subwrap => try airWrapOp(o, inst, " - ", "subw_"),
// TODO use a different strategy for mul that communicates to the optimizer
// that wrapping is UB.
- .mul => try airBinOp( o, inst, " * "),
- .mulwrap => try airWrapOp(o, inst, " * ", "mulw_"),
+ .mul => try airBinOp( o, inst, " * "),
+ .mulwrap => try airWrapOp(o, inst, " * ", "mulw_"),
// TODO use a different strategy for div that communicates to the optimizer
// that wrapping is UB.
- .div => try airBinOp( o, inst, " / "),
+ .div => try airBinOp( o, inst, " / "),
.cmp_eq => try airBinOp(o, inst, " == "),
.cmp_gt => try airBinOp(o, inst, " > "),
@@ -925,6 +893,8 @@ fn genBody(o: *Object, body: []const Air.Inst.Index) error{ AnalysisFail, OutOfM
.call => try airCall(o, inst),
.dbg_stmt => try airDbgStmt(o, inst),
.intcast => try airIntCast(o, inst),
+ .trunc => try airTrunc(o, inst),
+ .bool_to_int => try airBoolToInt(o, inst),
.load => try airLoad(o, inst),
.ret => try airRet(o, inst),
.store => try airStore(o, inst),
@@ -933,12 +903,13 @@ fn genBody(o: *Object, body: []const Air.Inst.Index) error{ AnalysisFail, OutOfM
.br => try airBr(o, inst),
.switch_br => try airSwitchBr(o, inst),
.wrap_optional => try airWrapOptional(o, inst),
- .ref => try airRef(o, inst),
.struct_field_ptr => try airStructFieldPtr(o, inst),
- .varptr => try airVarPtr(o, inst),
+ .struct_field_val => try airStructFieldVal(o, inst),
.slice_ptr => try airSliceField(o, inst, ".ptr;\n"),
.slice_len => try airSliceField(o, inst, ".len;\n"),
+ .ptr_elem_val => try airPtrElemVal(o, inst, "["),
+ .ptr_ptr_elem_val => try airPtrElemVal(o, inst, "[0]["),
.slice_elem_val => try airSliceElemVal(o, inst, "["),
.ptr_slice_elem_val => try airSliceElemVal(o, inst, "[0]["),
@@ -977,8 +948,18 @@ fn airSliceField(o: *Object, inst: Air.Inst.Index, suffix: []const u8) !CValue {
return local;
}
+fn airPtrElemVal(o: *Object, inst: Air.Inst.Index, prefix: []const u8) !CValue {
+ const is_volatile = false; // TODO
+ if (!is_volatile and o.liveness.isUnused(inst))
+ return CValue.none;
+
+ _ = prefix;
+ return o.dg.fail("TODO: C backend: airPtrElemVal", .{});
+}
+
fn airSliceElemVal(o: *Object, inst: Air.Inst.Index, prefix: []const u8) !CValue {
- if (o.liveness.isUnused(inst))
+ const is_volatile = false; // TODO
+ if (!is_volatile and o.liveness.isUnused(inst))
return CValue.none;
const bin_op = o.air.instructions.items(.data)[inst].bin_op;
@@ -994,12 +975,6 @@ fn airSliceElemVal(o: *Object, inst: Air.Inst.Index, prefix: []const u8) !CValue
return local;
}
-fn airVarPtr(o: *Object, inst: Air.Inst.Index) !CValue {
- const ty_pl = o.air.instructions.items(.data)[inst].ty_pl;
- const variable = o.air.variables[ty_pl.payload];
- return CValue{ .decl_ref = variable.owner_decl };
-}
-
fn airAlloc(o: *Object, inst: Air.Inst.Index) !CValue {
const writer = o.writer();
const inst_ty = o.air.typeOfIndex(inst);
@@ -1069,7 +1044,7 @@ fn airIntCast(o: *Object, inst: Air.Inst.Index) !CValue {
return CValue.none;
const ty_op = o.air.instructions.items(.data)[inst].ty_op;
- const from = try o.resolveInst(ty_op.operand);
+ const operand = try o.resolveInst(ty_op.operand);
const writer = o.writer();
const inst_ty = o.air.typeOfIndex(inst);
@@ -1077,7 +1052,31 @@ fn airIntCast(o: *Object, inst: Air.Inst.Index) !CValue {
try writer.writeAll(" = (");
try o.dg.renderType(writer, inst_ty);
try writer.writeAll(")");
- try o.writeCValue(writer, from);
+ try o.writeCValue(writer, operand);
+ try writer.writeAll(";\n");
+ return local;
+}
+
+fn airTrunc(o: *Object, inst: Air.Inst.Index) !CValue {
+ if (o.liveness.isUnused(inst))
+ return CValue.none;
+
+ const ty_op = o.air.instructions.items(.data)[inst].ty_op;
+ const operand = try o.resolveInst(ty_op.operand);
+ _ = operand;
+ return o.dg.fail("TODO: C backend: airTrunc", .{});
+}
+
+fn airBoolToInt(o: *Object, inst: Air.Inst.Index) !CValue {
+ if (o.liveness.isUnused(inst))
+ return CValue.none;
+ const un_op = o.air.instructions.items(.data)[inst].un_op;
+ const writer = o.writer();
+ const inst_ty = o.air.typeOfIndex(inst);
+ const operand = try o.resolveInst(un_op);
+ const local = try o.allocLocal(inst_ty, .Const);
+ try writer.writeAll(" = ");
+ try o.writeCValue(writer, operand);
try writer.writeAll(";\n");
return local;
}
@@ -1637,22 +1636,6 @@ fn airOptionalPayload(o: *Object, inst: Air.Inst.Index) !CValue {
return local;
}
-fn airRef(o: *Object, inst: Air.Inst.Index) !CValue {
- if (o.liveness.isUnused(inst))
- return CValue.none;
-
- const ty_op = o.air.instructions.items(.data)[inst].ty_op;
- const writer = o.writer();
- const operand = try o.resolveInst(ty_op.operand);
-
- const inst_ty = o.air.typeOfIndex(inst);
- const local = try o.allocLocal(inst_ty, .Const);
- try writer.writeAll(" = ");
- try o.writeCValue(writer, operand);
- try writer.writeAll(";\n");
- return local;
-}
-
fn airStructFieldPtr(o: *Object, inst: Air.Inst.Index) !CValue {
if (o.liveness.isUnused(inst))
return CValue.none;
@@ -1660,8 +1643,8 @@ fn airStructFieldPtr(o: *Object, inst: Air.Inst.Index) !CValue {
const ty_pl = o.air.instructions.items(.data)[inst].ty_pl;
const extra = o.air.extraData(Air.StructField, ty_pl.payload).data;
const writer = o.writer();
- const struct_ptr = try o.resolveInst(extra.struct_ptr);
- const struct_ptr_ty = o.air.typeOf(extra.struct_ptr);
+ const struct_ptr = try o.resolveInst(extra.struct_operand);
+ const struct_ptr_ty = o.air.typeOf(extra.struct_operand);
const struct_obj = struct_ptr_ty.elemType().castTag(.@"struct").?.data;
const field_name = struct_obj.fields.keys()[extra.field_index];
@@ -1680,6 +1663,26 @@ fn airStructFieldPtr(o: *Object, inst: Air.Inst.Index) !CValue {
return local;
}
+fn airStructFieldVal(o: *Object, inst: Air.Inst.Index) !CValue {
+ if (o.liveness.isUnused(inst))
+ return CValue.none;
+
+ const ty_pl = o.air.instructions.items(.data)[inst].ty_pl;
+ const extra = o.air.extraData(Air.StructField, ty_pl.payload).data;
+ const writer = o.writer();
+ const struct_byval = try o.resolveInst(extra.struct_operand);
+ const struct_ty = o.air.typeOf(extra.struct_operand);
+ const struct_obj = struct_ty.castTag(.@"struct").?.data;
+ const field_name = struct_obj.fields.keys()[extra.field_index];
+
+ const inst_ty = o.air.typeOfIndex(inst);
+ const local = try o.allocLocal(inst_ty, .Const);
+ try writer.writeAll(" = ");
+ try o.writeCValue(writer, struct_byval);
+ try writer.print(".{};\n", .{fmtIdent(field_name)});
+ return local;
+}
+
// *(E!T) -> E NOT *E
fn airUnwrapErrUnionErr(o: *Object, inst: Air.Inst.Index) !CValue {
if (o.liveness.isUnused(inst))
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-30 01:04:20 +0000