fix struct inside function referencing local const

closes #672

the crash and compile errors are fixed but structs
inside functions still get named after the functions
they're in. this will be fixed later.

src/all_types.hpp

@@ -37,13 +37,7 @@ struct ScopeDecls;
 struct ZigWindowsSDK;
 struct Tld;
 struct TldExport;
-
+struct IrAnalyze;
-struct IrGotoItem {
-    AstNode *source_node;
-    IrBasicBlock *bb;
-    size_t instruction_index;
-    Scope *scope;
-};
 
 struct IrExecutable {
     ZigList<IrBasicBlock *> basic_block_list;
@@ -53,13 +47,13 @@ struct IrExecutable {
     size_t *backward_branch_count;
     size_t backward_branch_quota;
     bool invalid;
-    ZigList<IrGotoItem> goto_list;
     bool is_inline;
     FnTableEntry *fn_entry;
     Buf *c_import_buf;
     AstNode *source_node;
     IrExecutable *parent_exec;
     IrExecutable *source_exec;
+    IrAnalyze *analysis;
     Scope *begin_scope;
     ZigList<Tld *> tld_list;
 };
@@ -1626,6 +1620,7 @@ struct VariableTableEntry {
     LLVMValueRef param_value_ref;
     bool shadowable;
     size_t mem_slot_index;
+    IrExecutable *owner_exec;
     size_t ref_count;
     VarLinkage linkage;
     IrInstruction *decl_instruction;

src/ir.cpp

@@ -2530,8 +2530,10 @@ static VariableTableEntry *ir_create_var(IrBuilder *irb, AstNode *node, Scope *s
         bool src_is_const, bool gen_is_const, bool is_shadowable, IrInstruction *is_comptime)
 {
     VariableTableEntry *var = create_local_var(irb->codegen, node, scope, name, src_is_const, gen_is_const, is_shadowable, is_comptime);
-    if (is_comptime != nullptr || gen_is_const)
+    if (is_comptime != nullptr || gen_is_const) {
         var->mem_slot_index = exec_next_mem_slot(irb->exec);
+        var->owner_exec = irb->exec;
+    }
     assert(var->child_scope);
     return var;
 }
@@ -7037,48 +7039,48 @@ IrInstruction *ir_eval_const_value(CodeGen *codegen, Scope *scope, AstNode *node
     if (expected_type != nullptr && type_is_invalid(expected_type))
         return codegen->invalid_instruction;
 
-    IrExecutable ir_executable = {0};
+    IrExecutable *ir_executable = allocate<IrExecutable>(1);
-    ir_executable.source_node = source_node;
+    ir_executable->source_node = source_node;
-    ir_executable.parent_exec = parent_exec;
+    ir_executable->parent_exec = parent_exec;
-    ir_executable.name = exec_name;
+    ir_executable->name = exec_name;
-    ir_executable.is_inline = true;
+    ir_executable->is_inline = true;
-    ir_executable.fn_entry = fn_entry;
+    ir_executable->fn_entry = fn_entry;
-    ir_executable.c_import_buf = c_import_buf;
+    ir_executable->c_import_buf = c_import_buf;
-    ir_executable.begin_scope = scope;
+    ir_executable->begin_scope = scope;
-    ir_gen(codegen, node, scope, &ir_executable);
+    ir_gen(codegen, node, scope, ir_executable);
 
-    if (ir_executable.invalid)
+    if (ir_executable->invalid)
         return codegen->invalid_instruction;
 
     if (codegen->verbose_ir) {
         fprintf(stderr, "\nSource: ");
         ast_render(codegen, stderr, node, 4);
         fprintf(stderr, "\n{ // (IR)\n");
-        ir_print(codegen, stderr, &ir_executable, 4);
+        ir_print(codegen, stderr, ir_executable, 4);
         fprintf(stderr, "}\n");
     }
-    IrExecutable analyzed_executable = {0};
+    IrExecutable *analyzed_executable = allocate<IrExecutable>(1);
-    analyzed_executable.source_node = source_node;
+    analyzed_executable->source_node = source_node;
-    analyzed_executable.parent_exec = parent_exec;
+    analyzed_executable->parent_exec = parent_exec;
-    analyzed_executable.source_exec = &ir_executable;
+    analyzed_executable->source_exec = ir_executable;
-    analyzed_executable.name = exec_name;
+    analyzed_executable->name = exec_name;
-    analyzed_executable.is_inline = true;
+    analyzed_executable->is_inline = true;
-    analyzed_executable.fn_entry = fn_entry;
+    analyzed_executable->fn_entry = fn_entry;
-    analyzed_executable.c_import_buf = c_import_buf;
+    analyzed_executable->c_import_buf = c_import_buf;
-    analyzed_executable.backward_branch_count = backward_branch_count;
+    analyzed_executable->backward_branch_count = backward_branch_count;
-    analyzed_executable.backward_branch_quota = backward_branch_quota;
+    analyzed_executable->backward_branch_quota = backward_branch_quota;
-    analyzed_executable.begin_scope = scope;
+    analyzed_executable->begin_scope = scope;
-    TypeTableEntry *result_type = ir_analyze(codegen, &ir_executable, &analyzed_executable, expected_type, node);
+    TypeTableEntry *result_type = ir_analyze(codegen, ir_executable, analyzed_executable, expected_type, node);
     if (type_is_invalid(result_type))
         return codegen->invalid_instruction;
 
     if (codegen->verbose_ir) {
         fprintf(stderr, "{ // (analyzed)\n");
-        ir_print(codegen, stderr, &analyzed_executable, 4);
+        ir_print(codegen, stderr, analyzed_executable, 4);
         fprintf(stderr, "}\n");
     }
 
-    return ir_exec_const_result(codegen, &analyzed_executable);
+    return ir_exec_const_result(codegen, analyzed_executable);
 }
 
 static TypeTableEntry *ir_resolve_type(IrAnalyze *ira, IrInstruction *type_value) {
@@ -9334,6 +9336,8 @@ static TypeTableEntry *ir_analyze_instruction_decl_var(IrAnalyze *ira, IrInstruc
     IrInstruction *casted_init_value = ir_implicit_cast(ira, init_value, explicit_type);
     bool is_comptime_var = ir_get_var_is_comptime(var);
 
+    bool var_class_requires_const = false;
+
     TypeTableEntry *result_type = casted_init_value->value.type;
     if (type_is_invalid(result_type)) {
         result_type = ira->codegen->builtin_types.entry_invalid;
@@ -9345,6 +9349,7 @@ static TypeTableEntry *ir_analyze_instruction_decl_var(IrAnalyze *ira, IrInstruc
                 result_type = ira->codegen->builtin_types.entry_invalid;
                 break;
             case VarClassRequiredConst:
+                var_class_requires_const = true;
                 if (!var->src_is_const && !is_comptime_var) {
                     ir_add_error_node(ira, source_node,
                         buf_sprintf("variable of type '%s' must be const or comptime",
@@ -9366,8 +9371,6 @@ static TypeTableEntry *ir_analyze_instruction_decl_var(IrAnalyze *ira, IrInstruc
         return ira->codegen->builtin_types.entry_void;
     }
 
-    bool is_comptime = ir_get_var_is_comptime(var);
-
     if (decl_var_instruction->align_value == nullptr) {
         var->align_bytes = get_abi_alignment(ira->codegen, result_type);
     } else {
@@ -9382,12 +9385,12 @@ static TypeTableEntry *ir_analyze_instruction_decl_var(IrAnalyze *ira, IrInstruc
             ConstExprValue *mem_slot = &ira->exec_context.mem_slot_list[var->mem_slot_index];
             *mem_slot = casted_init_value->value;
 
-            if (is_comptime) {
+            if (is_comptime_var || (var_class_requires_const && var->gen_is_const)) {
                 ir_build_const_from(ira, &decl_var_instruction->base);
                 return ira->codegen->builtin_types.entry_void;
             }
         }
-    } else if (is_comptime) {
+    } else if (is_comptime_var) {
         ir_add_error(ira, &decl_var_instruction->base,
                 buf_sprintf("cannot store runtime value in compile time variable"));
         var->value->type = ira->codegen->builtin_types.entry_invalid;
@@ -9690,6 +9693,10 @@ static VariableTableEntry *get_fn_var_by_index(FnTableEntry *fn_entry, size_t in
 static IrInstruction *ir_get_var_ptr(IrAnalyze *ira, IrInstruction *instruction,
         VariableTableEntry *var, bool is_const_ptr, bool is_volatile_ptr)
 {
+    if (var->mem_slot_index != SIZE_MAX && var->owner_exec->analysis == nullptr) {
+        assert(ira->codegen->errors.length != 0);
+        return ira->codegen->invalid_instruction;
+    }
     assert(var->value->type);
     if (type_is_invalid(var->value->type))
         return ira->codegen->invalid_instruction;
@@ -9700,9 +9707,14 @@ static IrInstruction *ir_get_var_ptr(IrAnalyze *ira, IrInstruction *instruction,
     if (var->value->special == ConstValSpecialStatic) {
         mem_slot = var->value;
     } else {
-        // TODO once the analyze code is fully ported over to IR we won't need this SIZE_MAX thing.
+        if (var->mem_slot_index != SIZE_MAX && (comptime_var_mem || var->gen_is_const)) {
-        if (var->mem_slot_index != SIZE_MAX && (comptime_var_mem || var->gen_is_const))
+            // find the relevant exec_context
-            mem_slot = &ira->exec_context.mem_slot_list[var->mem_slot_index];
+            assert(var->owner_exec != nullptr);
+            assert(var->owner_exec->analysis != nullptr);
+            IrExecContext *exec_context = &var->owner_exec->analysis->exec_context;
+            assert(var->mem_slot_index < exec_context->mem_slot_count);
+            mem_slot = &exec_context->mem_slot_list[var->mem_slot_index];
+        }
     }
 
     bool is_const = (var->value->type->id == TypeTableEntryIdMetaType) ? is_const_ptr : var->src_is_const;
@@ -15328,8 +15340,8 @@ TypeTableEntry *ir_analyze(CodeGen *codegen, IrExecutable *old_exec, IrExecutabl
     assert(!old_exec->invalid);
     assert(expected_type == nullptr || !type_is_invalid(expected_type));
 
-    IrAnalyze ir_analyze_data = {};
+    IrAnalyze *ira = allocate<IrAnalyze>(1);
-    IrAnalyze *ira = &ir_analyze_data;
+    old_exec->analysis = ira;
     ira->codegen = codegen;
     ira->explicit_return_type = expected_type;
 

test/cases/misc.zig

@@ -577,3 +577,22 @@ test "implicit comptime while" {
         @compileError("bad");
     }
 }
+
+test "struct inside function" {
+    testStructInFn();
+    comptime testStructInFn();
+}
+
+fn testStructInFn() {
+    const BlockKind = u32;
+
+    const Block = struct {
+        kind: BlockKind,
+    };
+
+    var block = Block { .kind = 1234 };
+
+    block.kind += 1;
+
+    assert(block.kind == 1235);
+}

test/compile_errors.zig

@@ -1,6 +1,18 @@
 const tests = @import("tests.zig");
 
 pub fn addCases(cases: &tests.CompileErrorContext) {
+    cases.add("bad identifier in function with struct defined inside function which references local const",
+        \\export fn entry() {
+        \\    const BlockKind = u32;
+        \\
+        \\    const Block = struct {
+        \\        kind: BlockKind,
+        \\    };
+        \\
+        \\    bogus;
+        \\}
+    , ".tmp_source.zig:8:5: error: use of undeclared identifier 'bogus'");
+
     cases.add("labeled break not found",
         \\export fn entry() {
         \\    blah: while (true) {