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IR: basic support for implicit casting to const pointer

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This commit is contained in:
Andrew Kelley
2016-12-18 01:54:27 -05:00
parent 69cf0ea568
commit 0d2f2b79ea
3 changed files with 43 additions and 2 deletions
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39
src/ir.cpp
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@@ -4230,6 +4230,13 @@ static ImplicitCastMatchResult ir_types_match_with_implicit_cast(IrAnalyze *ira,
return ImplicitCastMatchResultYes;
}
// implicitly take a const pointer to something
{
TypeTableEntry *const_ptr_actual = get_pointer_to_type(ira->codegen, actual_type, true);
if (types_match_const_cast_only(expected_type, const_ptr_actual)) {
return ImplicitCastMatchResultYes;
}
}
return ImplicitCastMatchResultNo;
}
@@ -4721,6 +4728,30 @@ static IrInstruction *ir_analyze_err_wrap_code(IrAnalyze *ira, IrInstruction *so
return result;
}
static IrInstruction *ir_analyze_cast_ref(IrAnalyze *ira, IrInstruction *source_instr, IrInstruction *value, TypeTableEntry *wanted_type) {
if (instr_is_comptime(value)) {
ConstExprValue *val = ir_resolve_const(ira, value, UndefBad);
if (!val)
return ira->codegen->invalid_instruction;
IrInstructionConst *const_instruction = ir_create_instruction<IrInstructionConst>(ira->new_irb.exec,
source_instr->scope, source_instr->source_node);
const_instruction->base.type_entry = wanted_type;
const_instruction->base.static_value.special = ConstValSpecialStatic;
const_instruction->base.static_value.depends_on_compile_var = val->depends_on_compile_var;
const_instruction->base.static_value.data.x_ptr.base_ptr = val;
const_instruction->base.static_value.data.x_ptr.index = SIZE_MAX;
return &const_instruction->base;
}
if (value->id == IrInstructionIdLoadPtr) {
IrInstructionLoadPtr *load_ptr_inst = (IrInstructionLoadPtr *)value;
return load_ptr_inst->ptr;
} else {
zig_panic("TODO more ways to cast to const pointer");
}
}
static IrInstruction *ir_analyze_null_to_maybe(IrAnalyze *ira, IrInstruction *source_instr, IrInstruction *value, TypeTableEntry *wanted_type) {
assert(wanted_type->id == TypeTableEntryIdMaybe);
assert(instr_is_comptime(value));
@@ -4974,6 +5005,14 @@ static IrInstruction *ir_analyze_cast(IrAnalyze *ira, IrInstruction *source_inst
return ir_resolve_cast(ira, source_instr, value, wanted_type, CastOpNoop, false);
}
// explicit cast from something to const pointer of it
{
TypeTableEntry *const_ptr_actual = get_pointer_to_type(ira->codegen, actual_type, true);
if (types_match_const_cast_only(wanted_type, const_ptr_actual)) {
return ir_analyze_cast_ref(ira, source_instr, value, wanted_type);
}
}
add_node_error(ira->codegen, source_instr->source_node,
buf_sprintf("invalid cast from type '%s' to '%s'",
buf_ptr(&actual_type->name),