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initialize mutable variables to zero

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This commit is contained in:
Josh Wolfe 2015-12-06 23:33:10 -07:00
parent 180f539f67
commit 66e3aa0910
3 changed files with 12 additions and 9 deletions
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4
src/analyze.cpp
View File

@ -454,8 +454,8 @@ static TypeTableEntry * analyze_expression(CodeGen *g, ImportTableEntry *import,
buf_sprintf("variable initialization is unreachable"));
}
if (implicit_type == nullptr) {
add_node_error(g, node, buf_sprintf("initial values are required for variable declaration"));
if (implicit_type == nullptr && variable_declaration->is_const) {
add_node_error(g, node, buf_sprintf("variables must have initial values or be declared 'mut'."));
}
TypeTableEntry *type = explicit_type != nullptr ? explicit_type : implicit_type;

10
src/codegen.cpp
View File

@ -526,14 +526,14 @@ static LLVMValueRef gen_expr(CodeGen *g, AstNode *node) {
variable->value_ref = gen_expr(g, node->data.variable_declaration.expr);
return nullptr;
} else {
LLVMValueRef value;
if (node->data.variable_declaration.expr) {
LLVMValueRef value = gen_expr(g, node->data.variable_declaration.expr);
add_debug_source_node(g, node);
return LLVMBuildStore(g->builder, value, variable->value_ref);
value = gen_expr(g, node->data.variable_declaration.expr);
} else {
value = LLVMConstNull(variable->type->type_ref);
}
add_debug_source_node(g, node);
return LLVMBuildStore(g->builder, value, variable->value_ref);
}
}
case NodeTypeCastExpr:

7
test/run_tests.cpp
View File

@ -332,7 +332,7 @@ fn void_fun(a : i32, b : void, c : i32) {
}
)SOURCE", "OK\n");
add_simple_case("void parameters", R"SOURCE(
add_simple_case("mutable local variables", R"SOURCE(
#link("c")
extern {
fn puts(s: *const u8) -> i32;
@ -340,6 +340,9 @@ extern {
}
export fn _start() -> unreachable {
let mut zero : i32;
if (zero == 0) { puts("zero"); }
let mut i = 0;
loop_start:
if i == 3 {
@ -351,7 +354,7 @@ loop_start:
done:
exit(0);
}
)SOURCE", "loop\nloop\nloop\n");
)SOURCE", "zero\nloop\nloop\nloop\n");
}
static void add_compile_failure_test_cases(void) {