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codegen: support byvalue struct assignment

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This commit is contained in:
Andrew Kelley
2015-12-23 03:19:22 -07:00
parent ebd7aeb541
commit e21369a153
5 changed files with 77 additions and 7 deletions
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45
src/codegen.cpp
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@@ -666,15 +666,36 @@ static LLVMValueRef gen_assign_expr(CodeGen *g, AstNode *node) {
LLVMValueRef target_ref = gen_lvalue(g, node, lhs_node, &op1_type);
TypeTableEntry *op2_type = get_expr_type(node->data.bin_op_expr.op2);
LLVMValueRef value = gen_expr(g, node->data.bin_op_expr.op2);
if (node->data.bin_op_expr.bin_op == BinOpTypeAssign) {
// value is ready as is
} else {
if (op1_type->id == TypeTableEntryIdStruct) {
assert(op2_type->id == TypeTableEntryIdStruct);
assert(op1_type == op2_type);
assert(node->data.bin_op_expr.bin_op == BinOpTypeAssign);
LLVMTypeRef ptr_u8 = LLVMPointerType(LLVMInt8Type(), 0);
add_debug_source_node(g, node);
LLVMValueRef src_ptr = LLVMBuildBitCast(g->builder, value, ptr_u8, "");
LLVMValueRef dest_ptr = LLVMBuildBitCast(g->builder, target_ref, ptr_u8, "");
LLVMValueRef params[] = {
dest_ptr, // dest pointer
src_ptr, // source pointer
LLVMConstInt(LLVMIntType(g->pointer_size_bytes * 8), op1_type->size_in_bits / 8, false), // byte count
LLVMConstInt(LLVMInt32Type(), op1_type->align_in_bits / 8, false), // align in bits
LLVMConstNull(LLVMInt1Type()), // is volatile
};
return LLVMBuildCall(g->builder, g->memcpy_fn_val, params, 5, "");
}
if (node->data.bin_op_expr.bin_op != BinOpTypeAssign) {
add_debug_source_node(g, node->data.bin_op_expr.op1);
LLVMValueRef left_value = LLVMBuildLoad(g->builder, target_ref, "");
TypeTableEntry *op2_type = get_expr_type(node->data.bin_op_expr.op2);
value = gen_arithmetic_bin_op(g, left_value, value, op1_type, op2_type, node);
}
@@ -1158,6 +1179,20 @@ static LLVMAttribute to_llvm_fn_attr(FnAttrId attr_id) {
static void do_code_gen(CodeGen *g) {
assert(!g->errors.length);
{
LLVMTypeRef param_types[] = {
LLVMPointerType(LLVMInt8Type(), 0),
LLVMPointerType(LLVMInt8Type(), 0),
LLVMIntType(g->pointer_size_bytes * 8),
LLVMInt32Type(),
LLVMInt1Type(),
};
LLVMTypeRef fn_type = LLVMFunctionType(LLVMVoidType(), param_types, 5, false);
Buf *name = buf_sprintf("llvm.memcpy.p0i8.p0i8.i%d", g->pointer_size_bytes * 8);
g->memcpy_fn_val = LLVMAddFunction(g->module, buf_ptr(name), fn_type);
assert(LLVMGetIntrinsicID(g->memcpy_fn_val));
}
// Generate module level variables
for (int i = 0; i < g->global_vars.length; i += 1) {
VariableTableEntry *var = g->global_vars.at(i);
@@ -1379,7 +1414,7 @@ static void define_builtin_types(CodeGen *g) {
TypeTableEntry *entry = new_type_table_entry(TypeTableEntryIdBool);
entry->type_ref = LLVMInt1Type();
buf_init_from_str(&entry->name, "bool");
entry->size_in_bits = 1;
entry->size_in_bits = 8;
entry->align_in_bits = 8;
entry->di_type = LLVMZigCreateDebugBasicType(g->dbuilder, buf_ptr(&entry->name),
entry->size_in_bits, entry->align_in_bits,