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introduce @as builtin for type coercion

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This commit also hooks up type coercion (previously called implicit
casting) into the result location mechanism, and additionally hooks up
variable declarations, maintaining the property that:

    var a: T = b;

is semantically equivalent to:

    var a = @as(T, b);

See #1757
This commit is contained in:
Andrew Kelley
2019-11-06 23:21:31 -05:00
parent 6d28b28ccc
commit 2a6fbbd8fb
4 changed files with 175 additions and 64 deletions
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23
src/ir_print.cpp
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@@ -601,6 +601,12 @@ static void ir_print_result_loc_bit_cast(IrPrint *irp, ResultLocBitCast *result_
fprintf(irp->f, ")");
}
static void ir_print_result_loc_cast(IrPrint *irp, ResultLocCast *result_loc_cast) {
fprintf(irp->f, "cast(ty=");
ir_print_other_instruction(irp, result_loc_cast->base.source_instruction);
fprintf(irp->f, ")");
}
static void ir_print_result_loc(IrPrint *irp, ResultLoc *result_loc) {
switch (result_loc->id) {
case ResultLocIdInvalid:
@@ -619,6 +625,8 @@ static void ir_print_result_loc(IrPrint *irp, ResultLoc *result_loc) {
return ir_print_result_loc_peer(irp, (ResultLocPeer *)result_loc);
case ResultLocIdBitCast:
return ir_print_result_loc_bit_cast(irp, (ResultLocBitCast *)result_loc);
case ResultLocIdCast:
return ir_print_result_loc_cast(irp, (ResultLocCast *)result_loc);
case ResultLocIdPeerParent:
fprintf(irp->f, "peer_parent");
return;
@@ -1484,6 +1492,13 @@ static void ir_print_ptr_cast_gen(IrPrint *irp, IrInstructionPtrCastGen *instruc
fprintf(irp->f, ")");
}
static void ir_print_implicit_cast(IrPrint *irp, IrInstructionImplicitCast *instruction) {
fprintf(irp->f, "@implicitCast(");
ir_print_other_instruction(irp, instruction->operand);
fprintf(irp->f, ")result=");
ir_print_result_loc(irp, &instruction->result_loc_cast->base);
}
static void ir_print_bit_cast_src(IrPrint *irp, IrInstructionBitCastSrc *instruction) {
fprintf(irp->f, "@bitCast(");
ir_print_other_instruction(irp, instruction->operand);
@@ -1739,14 +1754,6 @@ static void ir_print_align_cast(IrPrint *irp, IrInstructionAlignCast *instructio
fprintf(irp->f, ")");
}
static void ir_print_implicit_cast(IrPrint *irp, IrInstructionImplicitCast *instruction) {
fprintf(irp->f, "@implicitCast(");
ir_print_other_instruction(irp, instruction->dest_type);
fprintf(irp->f, ",");
ir_print_other_instruction(irp, instruction->target);
fprintf(irp->f, ")");
}
static void ir_print_resolve_result(IrPrint *irp, IrInstructionResolveResult *instruction) {
fprintf(irp->f, "ResolveResult(");
ir_print_result_loc(irp, instruction->result_loc);