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?? ..
?? CObjects.cpp(3.43 KB)
?? PyGreenlet.cpp(23.63 KB)
?? PyGreenlet.hpp(1.43 KB)
?? PyGreenletUnswitchable.cpp(4.27 KB)
?? PyModule.cpp(8.39 KB)
?? TBrokenGreenlet.cpp(1021 B)
?? TExceptionState.cpp(1.33 KB)
?? TGreenlet.cpp(25.13 KB)
?? TGreenlet.hpp(27.85 KB)
?? TGreenletGlobals.cpp(3.19 KB)
?? TMainGreenlet.cpp(3.2 KB)
?? TPythonState.cpp(15.6 KB)
?? TStackState.cpp(7.21 KB)
?? TThreadState.hpp(18.68 KB)
?? TThreadStateCreator.hpp(2.55 KB)
?? TThreadStateDestroy.cpp(7.98 KB)
?? TUserGreenlet.cpp(23 KB)
?? __init__.py(1.68 KB)
?? __pycache__
?? _greenlet.cpython-312-x86_64-linux-gnu.so(1.38 MB)
?? greenlet.cpp(10.74 KB)
?? greenlet.h(4.64 KB)
?? greenlet_allocator.hpp(2.55 KB)
?? greenlet_compiler_compat.hpp(4.24 KB)
?? greenlet_cpython_compat.hpp(4.05 KB)
?? greenlet_exceptions.hpp(4.4 KB)
?? greenlet_internal.hpp(2.65 KB)
?? greenlet_msvc_compat.hpp(2.91 KB)
?? greenlet_refs.hpp(33.63 KB)
?? greenlet_slp_switch.hpp(3.12 KB)
?? greenlet_thread_support.hpp(867 B)
?? platform
?? slp_platformselect.h(3.87 KB)
?? tests

Editing: TStackState.cpp

#ifndef GREENLET_STACK_STATE_CPP
#define GREENLET_STACK_STATE_CPP

#include "TGreenlet.hpp"

namespace greenlet {

#ifdef GREENLET_USE_STDIO
#include <iostream>
using std::cerr;
using std::endl;

std::ostream& operator<<(std::ostream& os, const StackState& s)
{
    os << "StackState(stack_start=" << (void*)s._stack_start
       << ", stack_stop=" << (void*)s.stack_stop
       << ", stack_copy=" << (void*)s.stack_copy
       << ", stack_saved=" << s._stack_saved
       << ", stack_prev=" << s.stack_prev
       << ", addr=" << &s
       << ")";
    return os;
}
#endif

StackState::StackState(void* mark, StackState& current)
    : _stack_start(nullptr),
      stack_stop((char*)mark),
      stack_copy(nullptr),
      _stack_saved(0),
      /* Skip a dying greenlet */
      stack_prev(current._stack_start
                 ? &current
                 : current.stack_prev)
{
}

StackState::StackState()
    : _stack_start(nullptr),
      stack_stop(nullptr),
      stack_copy(nullptr),
      _stack_saved(0),
      stack_prev(nullptr)
{
}

StackState::StackState(const StackState& other)
// can't use a delegating constructor because of
// MSVC for Python 2.7
    : _stack_start(nullptr),
      stack_stop(nullptr),
      stack_copy(nullptr),
      _stack_saved(0),
      stack_prev(nullptr)
{
    this->operator=(other);
}

StackState& StackState::operator=(const StackState& other)
{
    if (&other == this) {
        return *this;
    }
    if (other._stack_saved) {
        throw std::runtime_error("Refusing to steal memory.");
    }

//If we have memory allocated, dispose of it
    this->free_stack_copy();

this->_stack_start = other._stack_start;
    this->stack_stop = other.stack_stop;
    this->stack_copy = other.stack_copy;
    this->_stack_saved = other._stack_saved;
    this->stack_prev = other.stack_prev;
    return *this;
}

inline void StackState::free_stack_copy() noexcept
{
    PyMem_Free(this->stack_copy);
    this->stack_copy = nullptr;
    this->_stack_saved = 0;
}

inline void StackState::copy_heap_to_stack(const StackState& current) noexcept
{

/* Restore the heap copy back into the C stack */
    if (this->_stack_saved != 0) {
        memcpy(this->_stack_start, this->stack_copy, this->_stack_saved);
        this->free_stack_copy();
    }
    StackState* owner = const_cast<StackState*>(&current);
    if (!owner->_stack_start) {
        owner = owner->stack_prev; /* greenlet is dying, skip it */
    }
    while (owner && owner->stack_stop <= this->stack_stop) {
        // cerr << "\tOwner: " << owner << endl;
        owner = owner->stack_prev; /* find greenlet with more stack */
    }
    this->stack_prev = owner;
    // cerr << "\tFinished with: " << *this << endl;
}

inline int StackState::copy_stack_to_heap_up_to(const char* const stop) noexcept
{
    /* Save more of g's stack into the heap -- at least up to 'stop'
       g->stack_stop |________|
                     |        |
                     |    __ stop       . . . . .
                     |        |    ==>  .       .
                     |________|          _______
                     |        |         |       |
                     |        |         |       |
      g->stack_start |        |         |_______| g->stack_copy
     */
    intptr_t sz1 = this->_stack_saved;
    intptr_t sz2 = stop - this->_stack_start;
    assert(this->_stack_start);
    if (sz2 > sz1) {
        char* c = (char*)PyMem_Realloc(this->stack_copy, sz2);
        if (!c) {
            PyErr_NoMemory();
            return -1;
        }
        memcpy(c + sz1, this->_stack_start + sz1, sz2 - sz1);
        this->stack_copy = c;
        this->_stack_saved = sz2;
    }
    return 0;
}

inline int StackState::copy_stack_to_heap(char* const stackref,
                                          const StackState& current) noexcept
{
    /* must free all the C stack up to target_stop */
    const char* const target_stop = this->stack_stop;

StackState* owner = const_cast<StackState*>(&current);
    assert(owner->_stack_saved == 0); // everything is present on the stack
    if (!owner->_stack_start) {
        owner = owner->stack_prev; /* not saved if dying */
    }
    else {
        owner->_stack_start = stackref;
    }

while (owner->stack_stop < target_stop) {
        /* ts_current is entierely within the area to free */
        if (owner->copy_stack_to_heap_up_to(owner->stack_stop)) {
            return -1; /* XXX */
        }
        owner = owner->stack_prev;
    }
    if (owner != this) {
        if (owner->copy_stack_to_heap_up_to(target_stop)) {
            return -1; /* XXX */
        }
    }
    return 0;
}

inline bool StackState::started() const noexcept
{
    return this->stack_stop != nullptr;
}

inline bool StackState::main() const noexcept
{
    return this->stack_stop == (char*)-1;
}

inline bool StackState::active() const noexcept
{
    return this->_stack_start != nullptr;
}

inline void StackState::set_active() noexcept
{
    assert(this->_stack_start == nullptr);
    this->_stack_start = (char*)1;
}

inline void StackState::set_inactive() noexcept
{
    this->_stack_start = nullptr;
    // XXX: What if we still have memory out there?
    // That case is actually triggered by
    // test_issue251_issue252_explicit_reference_not_collectable (greenlet.tests.test_leaks.TestLeaks)
    // and
    // test_issue251_issue252_need_to_collect_in_background
    // (greenlet.tests.test_leaks.TestLeaks)
    //
    // Those objects never get deallocated, so the destructor never
    // runs.
    // It *seems* safe to clean up the memory here?
    if (this->_stack_saved) {
        this->free_stack_copy();
    }
}

inline intptr_t StackState::stack_saved() const noexcept
{
    return this->_stack_saved;
}

inline char* StackState::stack_start() const noexcept
{
    return this->_stack_start;
}

inline StackState StackState::make_main() noexcept
{
    StackState s;
    s._stack_start = (char*)1;
    s.stack_stop = (char*)-1;
    return s;
}

StackState::~StackState()
{
    if (this->_stack_saved != 0) {
        this->free_stack_copy();
    }
}

void StackState::copy_from_stack(void* vdest, const void* vsrc, size_t n) const
{
    char* dest = static_cast<char*>(vdest);
    const char* src = static_cast<const char*>(vsrc);
    if (src + n <= this->_stack_start
        || src >= this->_stack_start + this->_stack_saved
        || this->_stack_saved == 0) {
        // Nothing we're copying was spilled from the stack
        memcpy(dest, src, n);
        return;
    }

if (src < this->_stack_start) {
        // Copy the part before the saved stack.
        // We know src + n > _stack_start due to the test above.
        const size_t nbefore = this->_stack_start - src;
        memcpy(dest, src, nbefore);
        dest += nbefore;
        src += nbefore;
        n -= nbefore;
    }
    // We know src >= _stack_start after the before-copy, and
    // src < _stack_start + _stack_saved due to the first if condition
    size_t nspilled = std::min<size_t>(n, this->_stack_start + this->_stack_saved - src);
    memcpy(dest, this->stack_copy + (src - this->_stack_start), nspilled);
    dest += nspilled;
    src += nspilled;
    n -= nspilled;
    if (n > 0) {
        // Copy the part after the saved stack
        memcpy(dest, src, n);
    }
}

}; // namespace greenlet

#endif // GREENLET_STACK_STATE_CPP

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