motiejus/zig
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add @fieldParentPtr builtin function

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closes #320
This commit is contained in:
Andrew Kelley
2017-04-18 02:28:05 -04:00
parent 407916cd2f
commit a791417552
10 changed files with 295 additions and 21 deletions
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31
src/codegen.cpp
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@@ -2261,6 +2261,34 @@ static LLVMValueRef ir_render_enum_tag_name(CodeGen *g, IrExecutable *executable
return LLVMBuildInBoundsGEP(g->builder, enum_tag_type->data.enum_tag.name_table, indices, 2, "");
}
static LLVMValueRef ir_render_field_parent_ptr(CodeGen *g, IrExecutable *executable,
IrInstructionFieldParentPtr *instruction)
{
TypeTableEntry *container_ptr_type = instruction->base.value.type;
assert(container_ptr_type->id == TypeTableEntryIdPointer);
TypeTableEntry *container_type = container_ptr_type->data.pointer.child_type;
size_t byte_offset = LLVMOffsetOfElement(g->target_data_ref,
container_type->type_ref, instruction->field->gen_index);
LLVMValueRef field_ptr_val = ir_llvm_value(g, instruction->field_ptr);
if (byte_offset == 0) {
return LLVMBuildBitCast(g->builder, field_ptr_val, container_ptr_type->type_ref, "");
} else {
TypeTableEntry *usize = g->builtin_types.entry_usize;
LLVMValueRef field_ptr_int = LLVMBuildPtrToInt(g->builder, field_ptr_val,
usize->type_ref, "");
LLVMValueRef base_ptr_int = LLVMBuildNUWSub(g->builder, field_ptr_int,
LLVMConstInt(usize->type_ref, byte_offset, false), "");
return LLVMBuildIntToPtr(g->builder, base_ptr_int, container_ptr_type->type_ref, "");
}
}
static LLVMAtomicOrdering to_LLVMAtomicOrdering(AtomicOrder atomic_order) {
switch (atomic_order) {
@@ -2963,6 +2991,8 @@ static LLVMValueRef ir_render_instruction(CodeGen *g, IrExecutable *executable,
return ir_render_panic(g, executable, (IrInstructionPanic *)instruction);
case IrInstructionIdEnumTagName:
return ir_render_enum_tag_name(g, executable, (IrInstructionEnumTagName *)instruction);
case IrInstructionIdFieldParentPtr:
return ir_render_field_parent_ptr(g, executable, (IrInstructionFieldParentPtr *)instruction);
}
zig_unreachable();
}
@@ -4509,6 +4539,7 @@ static void define_builtin_fns(CodeGen *g) {
create_builtin_fn(g, BuiltinFnIdPtrCast, "ptrcast", 2);
create_builtin_fn(g, BuiltinFnIdIntToPtr, "intToPtr", 2);
create_builtin_fn(g, BuiltinFnIdEnumTagName, "enumTagName", 1);
create_builtin_fn(g, BuiltinFnIdFieldParentPtr, "fieldParentPtr", 3);
}
static void add_compile_var(CodeGen *g, const char *name, ConstExprValue *value) {