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fix regressions regarding writing through const pointers

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This commit is contained in:
Andrew Kelley 2019-08-02 16:09:40 -04:00
parent 9069ee957c
commit d105769926
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GPG Key ID: 7C5F548F728501A9
3 changed files with 28 additions and 24 deletions
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2
src/all_types.hpp
View File

@ -2543,6 +2543,7 @@ struct IrInstructionLoadPtrGen {
struct IrInstructionStorePtr {
IrInstruction base;
bool allow_write_through_const;
IrInstruction *ptr;
IrInstruction *value;
};
@ -3707,6 +3708,7 @@ enum ResultLocId {
struct ResultLoc {
ResultLocId id;
bool written;
bool allow_write_through_const;
IrInstruction *resolved_loc; // result ptr
IrInstruction *source_instruction;
IrInstruction *gen_instruction; // value to store to the result loc

34
src/ir.cpp
View File

@ -198,7 +198,7 @@ static IrInstruction *ir_analyze_unwrap_error_payload(IrAnalyze *ira, IrInstruct
static IrInstruction *ir_analyze_unwrap_err_code(IrAnalyze *ira, IrInstruction *source_instr,
IrInstruction *base_ptr, bool initializing);
static IrInstruction *ir_analyze_store_ptr(IrAnalyze *ira, IrInstruction *source_instr,
IrInstruction *ptr, IrInstruction *uncasted_value);
IrInstruction *ptr, IrInstruction *uncasted_value, bool allow_write_through_const);
static IrInstruction *ir_gen_union_init_expr(IrBuilder *irb, Scope *scope, AstNode *source_node,
IrInstruction *union_type, IrInstruction *field_name, AstNode *expr_node,
LVal lval, ResultLoc *parent_result_loc);
@ -1613,7 +1613,7 @@ static IrInstruction *ir_build_unreachable(IrBuilder *irb, Scope *scope, AstNode
return &unreachable_instruction->base;
}
static IrInstruction *ir_build_store_ptr(IrBuilder *irb, Scope *scope, AstNode *source_node,
static IrInstructionStorePtr *ir_build_store_ptr(IrBuilder *irb, Scope *scope, AstNode *source_node,
IrInstruction *ptr, IrInstruction *value)
{
IrInstructionStorePtr *instruction = ir_build_instruction<IrInstructionStorePtr>(irb, scope, source_node);
@ -1625,7 +1625,7 @@ static IrInstruction *ir_build_store_ptr(IrBuilder *irb, Scope *scope, AstNode *
ir_ref_instruction(ptr, irb->current_basic_block);
ir_ref_instruction(value, irb->current_basic_block);
return &instruction->base;
return instruction;
}
static IrInstruction *ir_build_var_decl_src(IrBuilder *irb, Scope *scope, AstNode *source_node,
@ -6051,6 +6051,7 @@ static IrInstruction *ir_gen_container_init_expr(IrBuilder *irb, Scope *scope, A
ResultLocInstruction *result_loc_inst = allocate<ResultLocInstruction>(1);
result_loc_inst->base.id = ResultLocIdInstruction;
result_loc_inst->base.source_instruction = field_ptr;
result_loc_inst->base.allow_write_through_const = true;
ir_ref_instruction(field_ptr, irb->current_basic_block);
ir_build_reset_result(irb, scope, expr_node, &result_loc_inst->base);
@ -6089,6 +6090,7 @@ static IrInstruction *ir_gen_container_init_expr(IrBuilder *irb, Scope *scope, A
ResultLocInstruction *result_loc_inst = allocate<ResultLocInstruction>(1);
result_loc_inst->base.id = ResultLocIdInstruction;
result_loc_inst->base.source_instruction = elem_ptr;
result_loc_inst->base.allow_write_through_const = true;
ir_ref_instruction(elem_ptr, irb->current_basic_block);
ir_build_reset_result(irb, scope, expr_node, &result_loc_inst->base);
@ -6646,7 +6648,7 @@ static IrInstruction *ir_gen_for_expr(IrBuilder *irb, Scope *parent_scope, AstNo
ir_set_cursor_at_end_and_append_block(irb, continue_block);
IrInstruction *new_index_val = ir_build_bin_op(irb, child_scope, node, IrBinOpAdd, index_val, one, false);
ir_mark_gen(ir_build_store_ptr(irb, child_scope, node, index_ptr, new_index_val));
ir_build_store_ptr(irb, child_scope, node, index_ptr, new_index_val)->allow_write_through_const = true;
ir_build_br(irb, child_scope, node, cond_block, is_comptime);
IrInstruction *else_result = nullptr;
@ -14848,7 +14850,7 @@ static IrInstruction *ir_analyze_instruction_decl_var(IrAnalyze *ira,
// instruction.
assert(deref->value.special != ConstValSpecialRuntime);
var_ptr->value.special = ConstValSpecialRuntime;
ir_analyze_store_ptr(ira, var_ptr, var_ptr, deref);
ir_analyze_store_ptr(ira, var_ptr, var_ptr, deref, false);
}
if (var_ptr->value.special == ConstValSpecialStatic && var->mem_slot_index != SIZE_MAX) {
@ -15862,7 +15864,7 @@ no_mem_slot:
}
static IrInstruction *ir_analyze_store_ptr(IrAnalyze *ira, IrInstruction *source_instr,
IrInstruction *ptr, IrInstruction *uncasted_value)
IrInstruction *ptr, IrInstruction *uncasted_value, bool allow_write_through_const)
{
assert(ptr->value.type->id == ZigTypeIdPointer);
@ -15878,7 +15880,7 @@ static IrInstruction *ir_analyze_store_ptr(IrAnalyze *ira, IrInstruction *source
ZigType *child_type = ptr->value.type->data.pointer.child_type;
if (ptr->value.type->data.pointer.is_const && !source_instr->is_gen) {
if (ptr->value.type->data.pointer.is_const && !allow_write_through_const) {
ir_add_error(ira, source_instr, buf_sprintf("cannot assign to constant"));
return ira->codegen->invalid_instruction;
}
@ -15957,10 +15959,9 @@ static IrInstruction *ir_analyze_store_ptr(IrAnalyze *ira, IrInstruction *source
break;
}
IrInstruction *result = ir_build_store_ptr(&ira->new_irb, source_instr->scope, source_instr->source_node,
ptr, value);
result->value.type = ira->codegen->builtin_types.entry_void;
return result;
IrInstructionStorePtr *store_ptr = ir_build_store_ptr(&ira->new_irb, source_instr->scope,
source_instr->source_node, ptr, value);
return &store_ptr->base;
}
static IrInstruction *ir_analyze_fn_call(IrAnalyze *ira, IrInstructionCallSrc *call_instruction,
@ -18283,7 +18284,7 @@ static IrInstruction *ir_analyze_instruction_store_ptr(IrAnalyze *ira, IrInstruc
if (type_is_invalid(value->value.type))
return ira->codegen->invalid_instruction;
return ir_analyze_store_ptr(ira, &instruction->base, ptr, value);
return ir_analyze_store_ptr(ira, &instruction->base, ptr, value, instruction->allow_write_through_const);
}
static IrInstruction *ir_analyze_instruction_load_ptr(IrAnalyze *ira, IrInstructionLoadPtr *instruction) {
@ -19691,7 +19692,7 @@ static IrInstruction *ir_analyze_container_init_fields(IrAnalyze *ira, IrInstruc
IrInstruction *field_ptr = ir_analyze_struct_field_ptr(ira, instruction, field, result_loc,
container_type, true);
ir_analyze_store_ptr(ira, instruction, field_ptr, runtime_inst);
ir_analyze_store_ptr(ira, instruction, field_ptr, runtime_inst, false);
if (instr_is_comptime(field_ptr) && field_ptr->value.data.x_ptr.mut != ConstPtrMutRuntimeVar) {
const_ptrs.append(field_ptr);
} else {
@ -19708,7 +19709,7 @@ static IrInstruction *ir_analyze_container_init_fields(IrAnalyze *ira, IrInstruc
IrInstruction *field_result_loc = const_ptrs.at(i);
IrInstruction *deref = ir_get_deref(ira, field_result_loc, field_result_loc, nullptr);
field_result_loc->value.special = ConstValSpecialRuntime;
ir_analyze_store_ptr(ira, field_result_loc, field_result_loc, deref);
ir_analyze_store_ptr(ira, field_result_loc, field_result_loc, deref, false);
}
}
}
@ -19835,7 +19836,7 @@ static IrInstruction *ir_analyze_instruction_container_init_list(IrAnalyze *ira,
assert(elem_result_loc->value.special == ConstValSpecialStatic);
IrInstruction *deref = ir_get_deref(ira, elem_result_loc, elem_result_loc, nullptr);
elem_result_loc->value.special = ConstValSpecialRuntime;
ir_analyze_store_ptr(ira, elem_result_loc, elem_result_loc, deref);
ir_analyze_store_ptr(ira, elem_result_loc, elem_result_loc, deref, false);
}
}
}
@ -25418,7 +25419,8 @@ static IrInstruction *ir_analyze_instruction_end_expr(IrAnalyze *ira, IrInstruct
return result_loc;
if (!was_written) {
IrInstruction *store_ptr = ir_analyze_store_ptr(ira, &instruction->base, result_loc, value);
IrInstruction *store_ptr = ir_analyze_store_ptr(ira, &instruction->base, result_loc, value,
instruction->result_loc->allow_write_through_const);
if (type_is_invalid(store_ptr->value.type)) {
return ira->codegen->invalid_instruction;
}

16
test/compile_errors.zig
View File

@ -201,7 +201,7 @@ pub fn addCases(cases: *tests.CompileErrorContext) void {
\\ return error.OutOfMemory;
\\}
,
"tmp.zig:2:7: error: error is discarded",
"tmp.zig:2:12: error: error is discarded",
);
cases.add(
@ -2740,7 +2740,7 @@ pub fn addCases(cases: *tests.CompileErrorContext) void {
\\ 3 = 3;
\\}
,
"tmp.zig:2:7: error: cannot assign to constant",
"tmp.zig:2:9: error: cannot assign to constant",
);
cases.add(
@ -2750,7 +2750,7 @@ pub fn addCases(cases: *tests.CompileErrorContext) void {
\\ a = 4;
\\}
,
"tmp.zig:3:7: error: cannot assign to constant",
"tmp.zig:3:9: error: cannot assign to constant",
);
cases.add(
@ -2820,7 +2820,7 @@ pub fn addCases(cases: *tests.CompileErrorContext) void {
\\}
\\export fn entry() void { f(); }
,
"tmp.zig:3:7: error: cannot assign to constant",
"tmp.zig:3:9: error: cannot assign to constant",
);
cases.add(
@ -3883,7 +3883,7 @@ pub fn addCases(cases: *tests.CompileErrorContext) void {
\\
\\export fn entry() usize { return @sizeOf(@typeOf(a)); }
,
"tmp.zig:6:24: error: unable to evaluate constant expression",
"tmp.zig:6:26: error: unable to evaluate constant expression",
"tmp.zig:4:17: note: called from here",
);
@ -4133,7 +4133,7 @@ pub fn addCases(cases: *tests.CompileErrorContext) void {
\\ cstr[0] = 'W';
\\}
,
"tmp.zig:3:11: error: cannot assign to constant",
"tmp.zig:3:13: error: cannot assign to constant",
);
cases.add(
@ -4143,7 +4143,7 @@ pub fn addCases(cases: *tests.CompileErrorContext) void {
\\ cstr[0] = 'W';
\\}
,
"tmp.zig:3:11: error: cannot assign to constant",
"tmp.zig:3:13: error: cannot assign to constant",
);
cases.add(
@ -4291,7 +4291,7 @@ pub fn addCases(cases: *tests.CompileErrorContext) void {
\\ f.field = 0;
\\}
,
"tmp.zig:6:13: error: cannot assign to constant",
"tmp.zig:6:15: error: cannot assign to constant",
);
cases.add(