parent
094336f07c
commit
b8d17b11a7
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@ -1097,7 +1097,7 @@ static LLVMValueRef gen_slice_expr(CodeGen *g, AstNode *node) {
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LLVMBuildStore(g->builder, slice_start_ptr, ptr_field_ptr);
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LLVMValueRef len_field_ptr = LLVMBuildStructGEP(g->builder, tmp_struct_ptr, 1, "");
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LLVMValueRef len_value = LLVMBuildSub(g->builder, end_val, start_val, "");
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LLVMValueRef len_value = LLVMBuildNSWSub(g->builder, end_val, start_val, "");
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LLVMBuildStore(g->builder, len_value, len_field_ptr);
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return tmp_struct_ptr;
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@ -1115,7 +1115,7 @@ static LLVMValueRef gen_slice_expr(CodeGen *g, AstNode *node) {
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LLVMBuildStore(g->builder, slice_start_ptr, ptr_field_ptr);
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LLVMValueRef len_field_ptr = LLVMBuildStructGEP(g->builder, tmp_struct_ptr, 1, "");
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LLVMValueRef len_value = LLVMBuildSub(g->builder, end_val, start_val, "");
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LLVMValueRef len_value = LLVMBuildNSWSub(g->builder, end_val, start_val, "");
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LLVMBuildStore(g->builder, len_value, len_field_ptr);
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return tmp_struct_ptr;
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@ -1160,7 +1160,7 @@ static LLVMValueRef gen_slice_expr(CodeGen *g, AstNode *node) {
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LLVMBuildStore(g->builder, slice_start_ptr, ptr_field_ptr);
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LLVMValueRef len_field_ptr = LLVMBuildStructGEP(g->builder, tmp_struct_ptr, len_index, "");
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LLVMValueRef len_value = LLVMBuildSub(g->builder, end_val, start_val, "");
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LLVMValueRef len_value = LLVMBuildNSWSub(g->builder, end_val, start_val, "");
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LLVMBuildStore(g->builder, len_value, len_field_ptr);
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return tmp_struct_ptr;
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@ -1287,6 +1287,28 @@ static LLVMValueRef gen_lvalue(CodeGen *g, AstNode *expr_node, AstNode *node,
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return target_ref;
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}
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static LLVMValueRef gen_overflow_op(CodeGen *g, TypeTableEntry *type_entry, AddSubMul op,
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LLVMValueRef val1, LLVMValueRef val2)
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{
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LLVMValueRef fn_val = get_int_overflow_fn(g, type_entry, op);
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LLVMValueRef params[] = {
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val1,
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val2,
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};
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LLVMValueRef result_struct = LLVMBuildCall(g->builder, fn_val, params, 2, "");
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LLVMValueRef result = LLVMBuildExtractValue(g->builder, result_struct, 0, "");
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LLVMValueRef overflow_bit = LLVMBuildExtractValue(g->builder, result_struct, 1, "");
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LLVMBasicBlockRef fail_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "OverflowFail");
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LLVMBasicBlockRef ok_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "OverflowOk");
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LLVMBuildCondBr(g->builder, overflow_bit, fail_block, ok_block);
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LLVMPositionBuilderAtEnd(g->builder, fail_block);
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gen_debug_safety_crash(g);
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LLVMPositionBuilderAtEnd(g->builder, ok_block);
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return result;
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}
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static LLVMValueRef gen_prefix_op_expr(CodeGen *g, AstNode *node) {
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assert(node->type == NodeTypePrefixOpExpr);
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assert(node->data.prefix_op_expr.primary_expr);
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@ -1300,12 +1322,20 @@ static LLVMValueRef gen_prefix_op_expr(CodeGen *g, AstNode *node) {
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case PrefixOpNegation:
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{
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LLVMValueRef expr = gen_expr(g, expr_node);
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if (expr_type->id == TypeTableEntryIdInt) {
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set_debug_source_node(g, node);
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return LLVMBuildNeg(g->builder, expr, "");
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} else if (expr_type->id == TypeTableEntryIdFloat) {
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set_debug_source_node(g, node);
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set_debug_source_node(g, node);
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if (expr_type->id == TypeTableEntryIdFloat) {
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return LLVMBuildFNeg(g->builder, expr, "");
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} else if (expr_type->id == TypeTableEntryIdInt) {
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if (expr_type->data.integral.is_wrapping) {
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return LLVMBuildNeg(g->builder, expr, "");
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} else if (want_debug_safety(g, expr_node)) {
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LLVMValueRef zero = LLVMConstNull(LLVMTypeOf(expr));
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return gen_overflow_op(g, expr_type, AddSubMulSub, zero, expr);
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} else if (expr_type->data.integral.is_signed) {
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return LLVMBuildNSWNeg(g->builder, expr, "");
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} else {
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return LLVMBuildNUWNeg(g->builder, expr, "");
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}
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} else {
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zig_unreachable();
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}
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@ -1431,28 +1461,6 @@ static LLVMValueRef gen_prefix_op_expr(CodeGen *g, AstNode *node) {
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zig_unreachable();
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}
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static LLVMValueRef gen_overflow_op(CodeGen *g, TypeTableEntry *type_entry, AddSubMul op,
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LLVMValueRef val1, LLVMValueRef val2)
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{
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LLVMValueRef fn_val = get_int_overflow_fn(g, type_entry, op);
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LLVMValueRef params[] = {
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val1,
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val2,
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};
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LLVMValueRef result_struct = LLVMBuildCall(g->builder, fn_val, params, 2, "");
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LLVMValueRef result = LLVMBuildExtractValue(g->builder, result_struct, 0, "");
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LLVMValueRef overflow_bit = LLVMBuildExtractValue(g->builder, result_struct, 1, "");
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LLVMBasicBlockRef fail_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "OverflowFail");
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LLVMBasicBlockRef ok_block = LLVMAppendBasicBlock(g->cur_fn->fn_value, "OverflowOk");
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LLVMBuildCondBr(g->builder, overflow_bit, fail_block, ok_block);
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LLVMPositionBuilderAtEnd(g->builder, fail_block);
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gen_debug_safety_crash(g);
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LLVMPositionBuilderAtEnd(g->builder, ok_block);
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return result;
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}
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static LLVMValueRef gen_arithmetic_bin_op(CodeGen *g, AstNode *source_node,
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LLVMValueRef val1, LLVMValueRef val2,
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TypeTableEntry *op1_type, TypeTableEntry *op2_type,
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@ -2727,7 +2735,7 @@ static LLVMValueRef gen_for_expr(CodeGen *g, AstNode *node) {
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LLVMPositionBuilderAtEnd(g->builder, continue_block);
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set_debug_source_node(g, node);
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LLVMValueRef new_index_val = LLVMBuildAdd(g->builder, index_val, one_const, "");
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LLVMValueRef new_index_val = LLVMBuildNSWAdd(g->builder, index_val, one_const, "");
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LLVMBuildStore(g->builder, new_index_val, index_ptr);
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LLVMBuildBr(g->builder, cond_block);
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@ -1323,6 +1323,46 @@ fn bar(a: []i32) -> i32 {
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fn baz(a: i32) {}
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)SOURCE");
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add_debug_safety_case("integer addition overflow", R"SOURCE(
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pub fn main(args: [][]u8) -> %void {
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add(65530, 10);
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}
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#static_eval_enable(false)
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fn add(a: u16, b: u16) -> u16 {
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a + b
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}
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)SOURCE");
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add_debug_safety_case("integer subtraction overflow", R"SOURCE(
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pub fn main(args: [][]u8) -> %void {
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sub(10, 20);
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}
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#static_eval_enable(false)
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fn sub(a: u16, b: u16) -> u16 {
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a - b
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}
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)SOURCE");
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add_debug_safety_case("integer multiplication overflow", R"SOURCE(
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pub fn main(args: [][]u8) -> %void {
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mul(300, 6000);
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}
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#static_eval_enable(false)
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fn mul(a: u16, b: u16) -> u16 {
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a * b
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}
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)SOURCE");
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add_debug_safety_case("integer negation overflow", R"SOURCE(
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pub fn main(args: [][]u8) -> %void {
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neg(-32768);
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}
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#static_eval_enable(false)
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fn neg(a: i16) -> i16 {
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-a
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}
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)SOURCE");
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}
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//////////////////////////////////////////////////////////////////////////////
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