compiler: Fix order of initialization bug with global var a, b = f().
From-SVN: r187103
This commit is contained in:
parent
0fe5522f8b
commit
29f31724ef
|
@ -590,10 +590,11 @@ Find_var::expression(Expression** pexpr)
|
|||
return TRAVERSE_CONTINUE;
|
||||
}
|
||||
|
||||
// Return true if EXPR refers to VAR.
|
||||
// Return true if EXPR, PREINIT, or DEP refers to VAR.
|
||||
|
||||
static bool
|
||||
expression_requires(Expression* expr, Block* preinit, Named_object* var)
|
||||
expression_requires(Expression* expr, Block* preinit, Named_object* dep,
|
||||
Named_object* var)
|
||||
{
|
||||
Find_var::Seen_objects seen_objects;
|
||||
Find_var find_var(var, &seen_objects);
|
||||
|
@ -601,7 +602,15 @@ expression_requires(Expression* expr, Block* preinit, Named_object* var)
|
|||
Expression::traverse(&expr, &find_var);
|
||||
if (preinit != NULL)
|
||||
preinit->traverse(&find_var);
|
||||
|
||||
if (dep != NULL)
|
||||
{
|
||||
Expression* init = dep->var_value()->init();
|
||||
if (init != NULL)
|
||||
Expression::traverse(&init, &find_var);
|
||||
if (dep->var_value()->has_pre_init())
|
||||
dep->var_value()->preinit()->traverse(&find_var);
|
||||
}
|
||||
|
||||
return find_var.found();
|
||||
}
|
||||
|
||||
|
@ -658,7 +667,7 @@ typedef std::list<Var_init> Var_inits;
|
|||
// variable V2 then we initialize V1 after V2.
|
||||
|
||||
static void
|
||||
sort_var_inits(Var_inits* var_inits)
|
||||
sort_var_inits(Gogo* gogo, Var_inits* var_inits)
|
||||
{
|
||||
Var_inits ready;
|
||||
while (!var_inits->empty())
|
||||
|
@ -667,6 +676,7 @@ sort_var_inits(Var_inits* var_inits)
|
|||
Named_object* var = p1->var();
|
||||
Expression* init = var->var_value()->init();
|
||||
Block* preinit = var->var_value()->preinit();
|
||||
Named_object* dep = gogo->var_depends_on(var->var_value());
|
||||
|
||||
// Start walking through the list to see which variables VAR
|
||||
// needs to wait for. We can skip P1->WAITING variables--that
|
||||
|
@ -678,20 +688,22 @@ sort_var_inits(Var_inits* var_inits)
|
|||
|
||||
for (; p2 != var_inits->end(); ++p2)
|
||||
{
|
||||
if (expression_requires(init, preinit, p2->var()))
|
||||
Named_object* p2var = p2->var();
|
||||
if (expression_requires(init, preinit, dep, p2var))
|
||||
{
|
||||
// Check for cycles.
|
||||
if (expression_requires(p2->var()->var_value()->init(),
|
||||
p2->var()->var_value()->preinit(),
|
||||
if (expression_requires(p2var->var_value()->init(),
|
||||
p2var->var_value()->preinit(),
|
||||
gogo->var_depends_on(p2var->var_value()),
|
||||
var))
|
||||
{
|
||||
error_at(var->location(),
|
||||
("initialization expressions for %qs and "
|
||||
"%qs depend upon each other"),
|
||||
var->message_name().c_str(),
|
||||
p2->var()->message_name().c_str());
|
||||
p2var->message_name().c_str());
|
||||
inform(p2->var()->location(), "%qs defined here",
|
||||
p2->var()->message_name().c_str());
|
||||
p2var->message_name().c_str());
|
||||
p2 = var_inits->end();
|
||||
}
|
||||
else
|
||||
|
@ -714,9 +726,11 @@ sort_var_inits(Var_inits* var_inits)
|
|||
// VAR does not depends upon any other initialization expressions.
|
||||
|
||||
// Check for a loop of VAR on itself. We only do this if
|
||||
// INIT is not NULL; when INIT is NULL, it means that
|
||||
// PREINIT sets VAR, which we will interpret as a loop.
|
||||
if (init != NULL && expression_requires(init, preinit, var))
|
||||
// INIT is not NULL and there is no dependency; when INIT is
|
||||
// NULL, it means that PREINIT sets VAR, which we will
|
||||
// interpret as a loop.
|
||||
if (init != NULL && dep == NULL
|
||||
&& expression_requires(init, preinit, NULL, var))
|
||||
error_at(var->location(),
|
||||
"initialization expression for %qs depends upon itself",
|
||||
var->message_name().c_str());
|
||||
|
@ -783,7 +797,7 @@ Gogo::write_globals()
|
|||
}
|
||||
|
||||
// There is nothing useful we can output for constants which
|
||||
// have ideal or non-integeral type.
|
||||
// have ideal or non-integral type.
|
||||
if (no->is_const())
|
||||
{
|
||||
Type* type = no->const_value()->type();
|
||||
|
@ -834,7 +848,9 @@ Gogo::write_globals()
|
|||
;
|
||||
else if (TREE_CONSTANT(init))
|
||||
{
|
||||
if (expression_requires(no->var_value()->init(), NULL, no))
|
||||
if (expression_requires(no->var_value()->init(), NULL,
|
||||
this->var_depends_on(no->var_value()),
|
||||
no))
|
||||
error_at(no->location(),
|
||||
"initialization expression for %qs depends "
|
||||
"upon itself",
|
||||
|
@ -879,6 +895,14 @@ Gogo::write_globals()
|
|||
else
|
||||
var_inits.push_back(Var_init(no, var_init_tree));
|
||||
}
|
||||
else if (this->var_depends_on(no->var_value()) != NULL)
|
||||
{
|
||||
// This variable is initialized from something that is
|
||||
// not in its init or preinit. This variable needs to
|
||||
// participate in dependency analysis sorting, in case
|
||||
// some other variable depends on this one.
|
||||
var_inits.push_back(Var_init(no, integer_zero_node));
|
||||
}
|
||||
|
||||
if (!is_sink && no->var_value()->type()->has_pointer())
|
||||
var_gc.push_back(no);
|
||||
|
@ -896,7 +920,7 @@ Gogo::write_globals()
|
|||
// workable order.
|
||||
if (!var_inits.empty())
|
||||
{
|
||||
sort_var_inits(&var_inits);
|
||||
sort_var_inits(this, &var_inits);
|
||||
for (Var_inits::const_iterator p = var_inits.begin();
|
||||
p != var_inits.end();
|
||||
++p)
|
||||
|
|
|
@ -32,6 +32,7 @@ Gogo::Gogo(Backend* backend, Linemap* linemap, int int_type_size,
|
|||
imported_unsafe_(false),
|
||||
packages_(),
|
||||
init_functions_(),
|
||||
var_deps_(),
|
||||
need_init_fn_(false),
|
||||
init_fn_name_(),
|
||||
imported_init_fns_(),
|
||||
|
@ -3820,6 +3821,10 @@ void
|
|||
Variable::lower_init_expression(Gogo* gogo, Named_object* function,
|
||||
Statement_inserter* inserter)
|
||||
{
|
||||
Named_object* dep = gogo->var_depends_on(this);
|
||||
if (dep != NULL && dep->is_variable())
|
||||
dep->var_value()->lower_init_expression(gogo, function, inserter);
|
||||
|
||||
if (this->init_ != NULL && !this->init_is_lowered_)
|
||||
{
|
||||
if (this->seen_)
|
||||
|
|
|
@ -384,6 +384,23 @@ class Gogo
|
|||
void
|
||||
clear_file_scope();
|
||||
|
||||
// Record that VAR1 must be initialized after VAR2. This is used
|
||||
// when VAR2 does not appear in VAR1's INIT or PREINIT.
|
||||
void
|
||||
record_var_depends_on(Variable* var1, Named_object* var2)
|
||||
{
|
||||
go_assert(this->var_deps_.find(var1) == this->var_deps_.end());
|
||||
this->var_deps_[var1] = var2;
|
||||
}
|
||||
|
||||
// Return the variable that VAR depends on, or NULL if none.
|
||||
Named_object*
|
||||
var_depends_on(Variable* var) const
|
||||
{
|
||||
Var_deps::const_iterator p = this->var_deps_.find(var);
|
||||
return p != this->var_deps_.end() ? p->second : NULL;
|
||||
}
|
||||
|
||||
// Queue up a type-specific function to be written out. This is
|
||||
// used when a type-specific function is needed when not at the top
|
||||
// level.
|
||||
|
@ -639,8 +656,9 @@ class Gogo
|
|||
// Type used to map package names to packages.
|
||||
typedef std::map<std::string, Package*> Packages;
|
||||
|
||||
// Type used to map special names in the sys package.
|
||||
typedef std::map<std::string, std::string> Sys_names;
|
||||
// Type used to map variables to the function calls that set them.
|
||||
// This is used for initialization dependency analysis.
|
||||
typedef std::map<Variable*, Named_object*> Var_deps;
|
||||
|
||||
// Type used to queue writing a type specific function.
|
||||
struct Specific_type_function
|
||||
|
@ -683,6 +701,10 @@ class Gogo
|
|||
Packages packages_;
|
||||
// The functions named "init", if there are any.
|
||||
std::vector<Named_object*> init_functions_;
|
||||
// A mapping from variables to the function calls that initialize
|
||||
// them, if it is not stored in the variable's init or preinit.
|
||||
// This is used for dependency analysis.
|
||||
Var_deps var_deps_;
|
||||
// Whether we need a magic initialization function.
|
||||
bool need_init_fn_;
|
||||
// The name of the magic initialization function.
|
||||
|
|
|
@ -1667,6 +1667,7 @@ Parse::init_vars_from_call(const Typed_identifier_list* vars, Type* type,
|
|||
// the right number of values, but it might. Declare the variables,
|
||||
// and then assign the results of the call to them.
|
||||
|
||||
Named_object* first_var = NULL;
|
||||
unsigned int index = 0;
|
||||
bool any_new = false;
|
||||
for (Typed_identifier_list::const_iterator pv = vars->begin();
|
||||
|
@ -1674,7 +1675,22 @@ Parse::init_vars_from_call(const Typed_identifier_list* vars, Type* type,
|
|||
++pv, ++index)
|
||||
{
|
||||
Expression* init = Expression::make_call_result(call, index);
|
||||
this->init_var(*pv, type, init, is_coloneq, false, &any_new);
|
||||
Named_object* no = this->init_var(*pv, type, init, is_coloneq, false,
|
||||
&any_new);
|
||||
|
||||
if (this->gogo_->in_global_scope() && no->is_variable())
|
||||
{
|
||||
if (first_var == NULL)
|
||||
first_var = no;
|
||||
else
|
||||
{
|
||||
// The subsequent vars have an implicit dependency on
|
||||
// the first one, so that everything gets initialized in
|
||||
// the right order and so that we detect cycles
|
||||
// correctly.
|
||||
this->gogo_->record_var_depends_on(no->var_value(), first_var);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (is_coloneq && !any_new)
|
||||
|
|
Loading…
Reference in New Issue