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/*
* MRustC - Rust Compiler
* - By John Hodge (Mutabah/thePowersGang)
*
* mir/check.cpp
* - MIR Correctness validation
*/
#include "main_bindings.hpp"
#include "mir.hpp"
#include <hir/visitor.hpp>
#include <hir_typeck/static.hpp>
void MIR_Validate(const StaticTraitResolve& resolve, const ::MIR::Function& fcn, const ::std::vector< ::std::pair< ::HIR::Pattern, ::HIR::TypeRef> >& args)
{
Span sp;
// Validation rules:
// - [CFA] All code paths from bb0 must end with either a return or a diverge (or loop)
// - Requires checking the links between basic blocks, with a bitmap to catch loops/multipath
{
bool returns = false;
::std::vector<bool> visited_bbs( fcn.blocks.size() );
::std::vector<unsigned int> to_visit_blocks;
to_visit_blocks.push_back(0);
while( to_visit_blocks.size() > 0 )
{
auto block = to_visit_blocks.back();
to_visit_blocks.pop_back();
assert(block < fcn.blocks.size());
if( visited_bbs[block] ) {
continue ;
}
visited_bbs[block] = true;
#define PUSH_BB(idx, desc) do {\
ASSERT_BUG(sp, idx < fcn.blocks.size(), "Invalid target block on bb" << block << " - " << desc << " bb" << idx);\
if( visited_bbs[idx] == false ) {\
to_visit_blocks.push_back(idx); \
}\
} while(0)
TU_MATCH(::MIR::Terminator, (fcn.blocks[block].terminator), (e),
(Incomplete,
BUG(sp, "Encounterd `Incomplete` block in control flow - bb" << block);
),
(Return,
returns = true;
),
(Diverge,
//can_panic = true;
),
(Goto,
PUSH_BB(e, "Goto");
),
(Panic,
PUSH_BB(e.dst, "Panic");
),
(If,
PUSH_BB(e.bb0, "If true");
PUSH_BB(e.bb1, "If false");
),
(Switch,
for(unsigned int i = 0; i < e.targets.size(); i++ ) {
PUSH_BB(e.targets[i], "Switch V" << i);
}
),
(Call,
PUSH_BB(e.ret_block, "Call ret");
PUSH_BB(e.panic_block, "Call panic");
)
)
#undef PUSH_BB
}
if( !returns ) {
DEBUG("- Function doesn't return.");
}
}
// - [ValState] No drops or usage of uninitalised values (Uninit, Moved, or Dropped)
// - [ValState] Temporaries are write-once.
// - Requires maintaining state information for all variables/temporaries with support for loops
// - [Flat] Types must be valid (correct type for slot etc.)
// - Simple check of all assignments/calls/...
}
namespace {
// TODO: Create visitor that handles setting up a StaticTraitResolve?
class OuterVisitor:
public ::HIR::Visitor
{
StaticTraitResolve m_resolve;
public:
OuterVisitor(const ::HIR::Crate& crate):
m_resolve(crate)
{}
// NOTE: This is left here to ensure that any expressions that aren't handled by higher code cause a failure
void visit_expr(::HIR::ExprPtr& exp) override {
BUG(Span(), "visit_expr hit in OuterVisitor");
}
void visit_type(::HIR::TypeRef& ty) override
{
TU_IFLET(::HIR::TypeRef::Data, ty.m_data, Array, e,
this->visit_type( *e.inner );
DEBUG("Array size " << ty);
if( e.size ) {
MIR_Validate(m_resolve, *e.size.m_mir, {});
}
)
else {
::HIR::Visitor::visit_type(ty);
}
}
// ------
// Code-containing items
// ------
void visit_function(::HIR::ItemPath p, ::HIR::Function& item) override {
auto _ = this->m_resolve.set_item_generics(item.m_params);
if( item.m_code ) {
DEBUG("Function code " << p);
MIR_Validate(m_resolve, *item.m_code.m_mir, item.m_args);
}
}
void visit_static(::HIR::ItemPath p, ::HIR::Static& item) override {
if( item.m_value ) {
DEBUG("`static` value " << p);
MIR_Validate(m_resolve, *item.m_value.m_mir, {});
}
}
void visit_constant(::HIR::ItemPath p, ::HIR::Constant& item) override {
if( item.m_value ) {
DEBUG("`const` value " << p);
MIR_Validate(m_resolve, *item.m_value.m_mir, {});
}
}
void visit_enum(::HIR::ItemPath p, ::HIR::Enum& item) override {
auto _ = this->m_resolve.set_item_generics(item.m_params);
for(auto& var : item.m_variants)
{
TU_IFLET(::HIR::Enum::Variant, var.second, Value, e,
MIR_Validate(m_resolve, *e.expr.m_mir, {});
)
}
}
// Boilerplate
void visit_trait(::HIR::ItemPath p, ::HIR::Trait& item) override {
auto _ = this->m_resolve.set_impl_generics(item.m_params);
::HIR::Visitor::visit_trait(p, item);
}
void visit_type_impl(::HIR::TypeImpl& impl) override {
auto _ = this->m_resolve.set_impl_generics(impl.m_params);
::HIR::Visitor::visit_type_impl(impl);
}
void visit_trait_impl(const ::HIR::SimplePath& trait_path, ::HIR::TraitImpl& impl) override {
auto _ = this->m_resolve.set_impl_generics(impl.m_params);
::HIR::Visitor::visit_trait_impl(trait_path, impl);
}
};
}
// --------------------------------------------------------------------
void MIR_CheckCrate(/*const*/ ::HIR::Crate& crate)
{
OuterVisitor ov(crate);
ov.visit_crate( crate );
}
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