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/*
* MRustC - Rust Compiler
* - By John Hodge (Mutabah/thePowersGang)
*
* mir/helpers.hpp
* - MIR Manipulation helpers
*/
#pragma once
#include <vector>
#include <functional>
#include <hir_typeck/static.hpp>
#include <mir/mir.hpp>
namespace HIR {
class Crate;
class TypeRef;
struct Pattern;
struct SimplePath;
}
namespace MIR {
class Function;
class LValue;
class Constant;
struct BasicBlock;
class Terminator;
class Statement;
class RValue;
class Param;
typedef unsigned int BasicBlockId;
struct CheckFailure:
public ::std::exception
{
};
#define MIR_BUG(state, ...) do { (state).print_bug( [&](auto& _os){_os << __VA_ARGS__; } ); throw ""; } while(0)
#define MIR_ASSERT(state, cnd, ...) do { if( !(cnd) ) (state).print_bug( [&](auto& _os){_os << __FILE__ << ":" << __LINE__ << " ASSERT " #cnd " failed - " << __VA_ARGS__; } ); } while(0)
#define MIR_TODO(state, ...) do { (state).print_todo( [&](auto& _os){_os << __VA_ARGS__; } ); throw ""; } while(0)
#define MIR_DEBUG(state, ...) do { DEBUG(FMT_CB(_ss, (state).fmt_pos(_ss);) << __VA_ARGS__); } while(0)
class TypeResolve
{
public:
typedef ::std::vector< ::std::pair< ::HIR::Pattern, ::HIR::TypeRef> > args_t;
private:
const unsigned int STMT_TERM = ~0u;
public:
const Span& sp;
const ::StaticTraitResolve& m_resolve;
const ::HIR::Crate& m_crate;
private:
::FmtLambda m_path;
public:
const ::HIR::TypeRef& m_ret_type;
const args_t& m_args;
const ::MIR::Function& m_fcn;
private:
const ::HIR::SimplePath* m_lang_Box = nullptr;
unsigned int bb_idx = 0;
unsigned int stmt_idx = 0;
public:
TypeResolve(const Span& sp, const ::StaticTraitResolve& resolve, ::FmtLambda path, const ::HIR::TypeRef& ret_type, const args_t& args, const ::MIR::Function& fcn):
sp(sp),
m_resolve(resolve),
m_crate(resolve.m_crate),
m_path(path),
m_ret_type(ret_type),
m_args(args),
m_fcn(fcn)
{
if( m_crate.m_lang_items.count("owned_box") > 0 ) {
m_lang_Box = &m_crate.m_lang_items.at("owned_box");
}
}
void set_cur_stmt(const ::MIR::BasicBlock& bb, const ::MIR::Statement& stmt) {
assert(&stmt >= &bb.statements.front());
assert(&stmt <= &bb.statements.back());
this->set_cur_stmt(bb, &stmt - bb.statements.data());
}
void set_cur_stmt(const ::MIR::BasicBlock& bb, unsigned int stmt_idx) {
assert(&bb >= &m_fcn.blocks.front());
assert(&bb <= &m_fcn.blocks.back());
this->set_cur_stmt(&bb - m_fcn.blocks.data(), stmt_idx);
}
void set_cur_stmt(unsigned int bb_idx, unsigned int stmt_idx) {
this->bb_idx = bb_idx;
this->stmt_idx = stmt_idx;
}
void set_cur_stmt_term(const ::MIR::BasicBlock& bb) {
assert(&bb >= &m_fcn.blocks.front());
assert(&bb <= &m_fcn.blocks.back());
this->set_cur_stmt_term(&bb - m_fcn.blocks.data());
}
void set_cur_stmt_term(unsigned int bb_idx) {
this->bb_idx = bb_idx;
this->stmt_idx = STMT_TERM;
}
unsigned int get_cur_stmt_ofs() const;
void fmt_pos(::std::ostream& os, bool include_path=false) const;
void print_bug(::std::function<void(::std::ostream& os)> cb) const {
print_msg("ERROR", cb);
}
void print_todo(::std::function<void(::std::ostream& os)> cb) const {
print_msg("TODO", cb);
}
void print_msg(const char* tag, ::std::function<void(::std::ostream& os)> cb) const;
const ::MIR::BasicBlock& get_block(::MIR::BasicBlockId id) const;
const ::HIR::TypeRef& get_static_type(::HIR::TypeRef& tmp, const ::HIR::Path& path) const;
const ::HIR::TypeRef& get_lvalue_type(::HIR::TypeRef& tmp, const ::MIR::LValue& val, unsigned wrapper_skip_count=0) const;
const ::HIR::TypeRef& get_lvalue_type(::HIR::TypeRef& tmp, const ::MIR::LValue::CRef& val) const {
return get_lvalue_type(tmp, val.lv(), val.lv().m_wrappers.size() - val.wrapper_count());
}
const ::HIR::TypeRef& get_lvalue_type(::HIR::TypeRef& tmp, const ::MIR::LValue::MRef& val) const {
return get_lvalue_type(tmp, val.lv(), val.lv().m_wrappers.size() - val.wrapper_count());
}
const ::HIR::TypeRef& get_unwrapped_type(::HIR::TypeRef& tmp, const ::MIR::LValue::Wrapper& w, const ::HIR::TypeRef& ty) const;
const ::HIR::TypeRef& get_param_type(::HIR::TypeRef& tmp, const ::MIR::Param& val) const;
::HIR::TypeRef get_const_type(const ::MIR::Constant& c) const;
bool lvalue_is_copy(const ::MIR::LValue& val) const;
const ::HIR::TypeRef* is_type_owned_box(const ::HIR::TypeRef& ty) const;
friend ::std::ostream& operator<<(::std::ostream& os, const TypeResolve& x) {
x.fmt_pos(os);
return os;
}
};
// --------------------------------------------------------------------
// MIR_Helper_GetLifetimes
// --------------------------------------------------------------------
class ValueLifetime
{
::std::vector<bool> statements;
public:
ValueLifetime(::std::vector<bool> stmts):
statements( mv$(stmts) )
{}
bool valid_at(size_t ofs) const {
return statements.at(ofs);
}
// true if this value is used at any point
bool is_used() const {
for(auto v : statements)
if( v )
return true;
return false;
}
bool overlaps(const ValueLifetime& x) const {
assert(statements.size() == x.statements.size());
for(unsigned int i = 0; i < statements.size(); i ++)
{
if( statements[i] && x.statements[i] )
return true;
}
return false;
}
void unify(const ValueLifetime& x) {
assert(statements.size() == x.statements.size());
for(unsigned int i = 0; i < statements.size(); i ++)
{
if( x.statements[i] )
statements[i] = true;
}
}
};
struct ValueLifetimes
{
::std::vector<size_t> m_block_offsets;
::std::vector<ValueLifetime> m_slots;
bool slot_valid(unsigned idx, unsigned bb_idx, unsigned stmt_idx) const {
return m_slots.at(idx).valid_at( m_block_offsets[bb_idx] + stmt_idx );
}
};
namespace visit {
enum class ValUsage {
Move,
Read,
Write,
Borrow,
};
extern bool visit_mir_lvalue(const ::MIR::LValue& lv, ValUsage u, ::std::function<bool(const ::MIR::LValue& , ValUsage)> cb);
extern bool visit_mir_lvalue(const ::MIR::Param& p, ValUsage u, ::std::function<bool(const ::MIR::LValue& , ValUsage)> cb);
extern bool visit_mir_lvalues(const ::MIR::RValue& rval, ::std::function<bool(const ::MIR::LValue& , ValUsage)> cb);
extern bool visit_mir_lvalues(const ::MIR::Statement& stmt, ::std::function<bool(const ::MIR::LValue& , ValUsage)> cb);
extern bool visit_mir_lvalues(const ::MIR::Terminator& term, ::std::function<bool(const ::MIR::LValue& , ValUsage)> cb);
} // namespace visit
} // namespace MIR
extern ::MIR::ValueLifetimes MIR_Helper_GetLifetimes(::MIR::TypeResolve& state, const ::MIR::Function& fcn, bool dump_debug, const ::std::vector<bool>* mask=nullptr);
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