authorgravatar for thatlemon@gmail.comLemonBoy <thatlemon@gmail.com> 2019-05-14 11:12:54+02:00
committergravatar for andrew@ziglang.orgAndrew Kelley <andrew@ziglang.org> 2019-05-28 13:02:45-04:00
loge2c22634343691a76ee7815806c25ee8bc976a42
tree1ea347c92b26abcde1498c3171057134a7d809fd
parent568dc56232d8a1bf53495dd1c742ffae383ceaab

Move __zig_fail_unwrap locals on stack

1 files changed, 51 insertions(+), 54 deletions(-)

src/codegen.cpp+51-54
......@@ -296,6 +296,7 @@ static LLVMValueRef gen_const_val(CodeGen *g, ConstExprValue *const_val, const c
296296static void generate_error_name_table(CodeGen *g);
297297static bool value_is_all_undef(ConstExprValue *const_val);
298298static void gen_undef_init(CodeGen *g, uint32_t ptr_align_bytes, ZigType *value_type, LLVMValueRef ptr);
299static LLVMValueRef build_alloca(CodeGen *g, ZigType *type_entry, const char *name, uint32_t alignment);
299300
300301static void addLLVMAttr(LLVMValueRef val, LLVMAttributeIndex attr_index, const char *attr_name) {
301302 unsigned kind_id = LLVMGetEnumAttributeKindForName(attr_name, strlen(attr_name));
......@@ -1518,53 +1519,12 @@ static LLVMValueRef get_safety_crash_err_fn(CodeGen *g) {
15181519 generate_error_name_table(g);
15191520 assert(g->err_name_table != nullptr);
15201521
1521 size_t unwrap_err_msg_text_len = strlen(unwrap_err_msg_text);
1522 size_t err_buf_len = strlen(unwrap_err_msg_text) + g->largest_err_name_len;
1523 LLVMValueRef *err_buf_vals = allocate<LLVMValueRef>(err_buf_len);
1524 size_t i = 0;
1525 for (; i < unwrap_err_msg_text_len; i += 1) {
1526 err_buf_vals[i] = LLVMConstInt(LLVMInt8Type(), unwrap_err_msg_text[i], false);
1527 }
1528 for (; i < err_buf_len; i += 1) {
1529 err_buf_vals[i] = LLVMGetUndef(LLVMInt8Type());
1530 }
1531 uint32_t u8_align_bytes = get_abi_alignment(g, g->builtin_types.entry_u8);
1532 LLVMValueRef init_value = LLVMConstArray(LLVMInt8Type(), err_buf_vals, err_buf_len);
1533 LLVMValueRef global_array = LLVMAddGlobal(g->module, LLVMTypeOf(init_value), "");
1534 LLVMSetInitializer(global_array, init_value);
1535 LLVMSetLinkage(global_array, LLVMInternalLinkage);
1536 LLVMSetGlobalConstant(global_array, false);
1537 LLVMSetUnnamedAddr(global_array, true);
1538 LLVMSetAlignment(global_array, u8_align_bytes);
1539
1540 ZigType *usize = g->builtin_types.entry_usize;
1541 LLVMValueRef full_buf_ptr_indices[] = {
1542 LLVMConstNull(usize->llvm_type),
1543 LLVMConstNull(usize->llvm_type),
1544 };
1545 LLVMValueRef full_buf_ptr = LLVMConstInBoundsGEP(global_array, full_buf_ptr_indices, 2);
1546
1547
1548 ZigType *u8_ptr_type = get_pointer_to_type_extra(g, g->builtin_types.entry_u8, true, false,
1549 PtrLenUnknown, get_abi_alignment(g, g->builtin_types.entry_u8), 0, 0, false);
1550 ZigType *str_type = get_slice_type(g, u8_ptr_type);
1551 LLVMValueRef global_slice_fields[] = {
1552 full_buf_ptr,
1553 LLVMConstNull(usize->llvm_type),
1554 };
1555 LLVMValueRef slice_init_value = LLVMConstNamedStruct(get_llvm_type(g, str_type), global_slice_fields, 2);
1556 LLVMValueRef global_slice = LLVMAddGlobal(g->module, LLVMTypeOf(slice_init_value), "");
1557 LLVMSetInitializer(global_slice, slice_init_value);
1558 LLVMSetLinkage(global_slice, LLVMInternalLinkage);
1559 LLVMSetGlobalConstant(global_slice, false);
1560 LLVMSetUnnamedAddr(global_slice, true);
1561 LLVMSetAlignment(global_slice, get_abi_alignment(g, str_type));
1562
1563 LLVMValueRef offset_ptr_indices[] = {
1564 LLVMConstNull(usize->llvm_type),
1565 LLVMConstInt(usize->llvm_type, unwrap_err_msg_text_len, false),
1566 };
1567 LLVMValueRef offset_buf_ptr = LLVMConstInBoundsGEP(global_array, offset_ptr_indices, 2);
1522 // Generate the constant part of the error message
1523 LLVMValueRef msg_prefix_init = LLVMConstString(unwrap_err_msg_text, strlen(unwrap_err_msg_text), 1);
1524 LLVMValueRef msg_prefix = LLVMAddGlobal(g->module, LLVMTypeOf(msg_prefix_init), "");
1525 LLVMSetInitializer(msg_prefix, msg_prefix_init);
1526 LLVMSetLinkage(msg_prefix, LLVMInternalLinkage);
1527 LLVMSetGlobalConstant(msg_prefix, true);
15681528
15691529 Buf *fn_name = get_mangled_name(g, buf_create_from_str("__zig_fail_unwrap"), false);
15701530 LLVMTypeRef fn_type_ref;
......@@ -1601,6 +1561,19 @@ static LLVMValueRef get_safety_crash_err_fn(CodeGen *g) {
16011561 LLVMPositionBuilderAtEnd(g->builder, entry_block);
16021562 ZigLLVMClearCurrentDebugLocation(g->builder);
16031563
1564 ZigType *usize_ty = g->builtin_types.entry_usize;
1565 ZigType *u8_ptr_type = get_pointer_to_type_extra(g, g->builtin_types.entry_u8, true, false,
1566 PtrLenUnknown, get_abi_alignment(g, g->builtin_types.entry_u8), 0, 0, false);
1567 ZigType *str_type = get_slice_type(g, u8_ptr_type);
1568
1569 // Allocate a buffer to hold the fully-formatted error message
1570 const size_t err_buf_len = strlen(unwrap_err_msg_text) + g->largest_err_name_len;
1571 LLVMValueRef max_msg_len = LLVMConstInt(usize_ty->llvm_type, err_buf_len, 0);
1572 LLVMValueRef msg_buffer = LLVMBuildArrayAlloca(g->builder, LLVMInt8Type(), max_msg_len, "msg_buffer");
1573
1574 // Allocate a []u8 slice for the message
1575 LLVMValueRef msg_slice = build_alloca(g, str_type, "msg_slice", 0);
1576
16041577 LLVMValueRef err_ret_trace_arg;
16051578 LLVMValueRef err_val;
16061579 if (g->have_err_ret_tracing) {
......@@ -1611,8 +1584,9 @@ static LLVMValueRef get_safety_crash_err_fn(CodeGen *g) {
16111584 err_val = LLVMGetParam(fn_val, 0);
16121585 }
16131586
1587 // Fetch the error name from the global table
16141588 LLVMValueRef err_table_indices[] = {
1615 LLVMConstNull(g->builtin_types.entry_usize->llvm_type),
1589 LLVMConstNull(usize_ty->llvm_type),
16161590 err_val,
16171591 };
16181592 LLVMValueRef err_name_val = LLVMBuildInBoundsGEP(g->builder, g->err_name_table, err_table_indices, 2, "");
......@@ -1623,15 +1597,38 @@ static LLVMValueRef get_safety_crash_err_fn(CodeGen *g) {
16231597 LLVMValueRef len_field_ptr = LLVMBuildStructGEP(g->builder, err_name_val, slice_len_index, "");
16241598 LLVMValueRef err_name_len = gen_load_untyped(g, len_field_ptr, 0, false, "");
16251599
1626 ZigLLVMBuildMemCpy(g->builder, offset_buf_ptr, u8_align_bytes, err_name_ptr, u8_align_bytes, err_name_len, false);
1600 LLVMValueRef msg_prefix_len = LLVMConstInt(usize_ty->llvm_type, strlen(unwrap_err_msg_text), false);
1601 // Points to the beginning of msg_buffer
1602 LLVMValueRef msg_buffer_ptr_indices[] = {
1603 LLVMConstNull(usize_ty->llvm_type),
1604 };
1605 LLVMValueRef msg_buffer_ptr = LLVMBuildInBoundsGEP(g->builder, msg_buffer, msg_buffer_ptr_indices, 1, "");
1606 // Points to the beginning of the constant prefix message
1607 LLVMValueRef msg_prefix_ptr_indices[] = {
1608 LLVMConstNull(usize_ty->llvm_type),
1609 };
1610 LLVMValueRef msg_prefix_ptr = LLVMConstInBoundsGEP(msg_prefix, msg_prefix_ptr_indices, 1);
1611
1612 // Build the message using the prefix...
1613 ZigLLVMBuildMemCpy(g->builder, msg_buffer_ptr, 1, msg_prefix_ptr, 1, msg_prefix_len, false);
1614 // ..and append the error name
1615 LLVMValueRef msg_buffer_ptr_after_indices[] = {
1616 msg_prefix_len,
1617 };
1618 LLVMValueRef msg_buffer_ptr_after = LLVMBuildInBoundsGEP(g->builder, msg_buffer, msg_buffer_ptr_after_indices, 1, "");
1619 ZigLLVMBuildMemCpy(g->builder, msg_buffer_ptr_after, 1, err_name_ptr, 1, err_name_len, false);
16271620
1628 LLVMValueRef const_prefix_len = LLVMConstInt(LLVMTypeOf(err_name_len), strlen(unwrap_err_msg_text), false);
1629 LLVMValueRef full_buf_len = LLVMBuildNUWAdd(g->builder, const_prefix_len, err_name_len, "");
1621 // Set the slice pointer
1622 LLVMValueRef msg_slice_ptr_field_ptr = LLVMBuildStructGEP(g->builder, msg_slice, slice_ptr_index, "");
1623 gen_store_untyped(g, msg_buffer_ptr, msg_slice_ptr_field_ptr, 0, false);
16301624
1631 LLVMValueRef global_slice_len_field_ptr = LLVMBuildStructGEP(g->builder, global_slice, slice_len_index, "");
1632 gen_store(g, full_buf_len, global_slice_len_field_ptr, u8_ptr_type);
1625 // Set the slice length
1626 LLVMValueRef slice_len = LLVMBuildNUWAdd(g->builder, msg_prefix_len, err_name_len, "");
1627 LLVMValueRef msg_slice_len_field_ptr = LLVMBuildStructGEP(g->builder, msg_slice, slice_len_index, "");
1628 gen_store_untyped(g, slice_len, msg_slice_len_field_ptr, 0, false);
16331629
1634 gen_panic(g, global_slice, err_ret_trace_arg);
1630 // Call panic()
1631 gen_panic(g, msg_slice, err_ret_trace_arg);
16351632
16361633 LLVMPositionBuilderAtEnd(g->builder, prev_block);
16371634 LLVMSetCurrentDebugLocation(g->builder, prev_debug_location);