gcc/liboffloadmic/runtime/offload_table.h

/*
    Copyright (c) 2014-2016 Intel Corporation.  All Rights Reserved.

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    modification, are permitted provided that the following conditions
    are met:

      * Redistributions of source code must retain the above copyright
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        notice, this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.
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        contributors may be used to endorse or promote products derived
        from this software without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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*/


/*! \file
    \brief Function and Variable tables used by the runtime library
*/

#ifndef OFFLOAD_TABLE_H_INCLUDED
#define OFFLOAD_TABLE_H_INCLUDED

#include "offload_util.h"

#define OFFLOAD_VERSION_16   1600
#define OFFLOAD_VERSION_17   1700

// Template representing double linked list of tables
template <typename T> class TableList {
public:
    // table type
    typedef T Table;

    // List node
    struct Node {
        Table   table;
        Node*   prev;
        Node*   next;
    };

public:
    explicit TableList(Node *node = 0) : m_head(node) {}

    void add_table(Node *node) {
        m_lock.lock();
        if (m_head != 0) {
            node->next = m_head;
            m_head->prev = node;
        }
        m_head = node;

        m_lock.unlock();
    }

    void remove_table(Node *node) {
        if (node->next != 0) {
            node->next->prev = node->prev;
        }
        if (node->prev != 0) {
            node->prev->next = node->next;
        }
        if (m_head == node) {
            m_head = node->next;
        }
    }

protected:
    Node*           m_head;
    mutex_t         m_lock;
};

// Function lookup table.
struct FuncTable {
    //! Function table entry
    /*! This table contains functions created from offload regions.   */
    /*! Each entry consists of a pointer to the function's "key"
        and the function address.                                     */
    /*! Each shared library or executable may contain one such table. */
    /*! The end of the table is marked with an entry whose name field
        has value -1.                                                 */
    struct Entry {
        const char* name; //!< Name of the function
        void*       func; //!< Address of the function
    };

    // entries
    const Entry *entries;

    // max name length
    int64_t max_name_len;
};

// Function table
class DLL_LOCAL FuncList : public TableList<FuncTable> {
public:
    explicit FuncList(Node *node = 0) : TableList<Table>(node),
                                        m_max_name_len(-1)
    {}

    // add table to the list
    void add_table(Node *node) {
        // recalculate max function name length
        m_max_name_len = -1;

        // add table
        TableList<Table>::add_table(node);
    }

    // find function address for the given name
    const void* find_addr(const char *name);

    // find function name for the given address
    const char* find_name(const void *addr);

    // max name length from all tables in the list
    int64_t max_name_length(void);

    // debug dump
    void dump(void);

private:
    // max name length within from all tables
    int64_t m_max_name_len;
};

#define VAR_ALLOC_TYPE  uint64_t
#define OPENMP_IMPLICIT   1    // Compiler promoted openmp declare var
                               // due to implicit use without openmp declare 
#define OPENMP_LINK       2    // Openmp link clause in openmp declare

#define IS_OPENMP_IMPLICIT(var_alloc_type)         (var_alloc_type & 1)
#define IS_OPENMP_LINK(var_alloc_type)             (var_alloc_type & 2)
#define IS_OPENMP_IMPLICIT_OR_LINK(var_alloc_type) (var_alloc_type & 3)

// Table entry for static variables
struct VarTable {
    //! Variable table entry
    /*! This table contains statically allocated variables marked with
        __declspec(target(mic) or #pragma omp declare target.           */
    /*! Each entry consists of a pointer to the variable's "key",
        the variable address and its size in bytes.                     */
    /*! Because memory allocation is done from the host,
        the MIC table does not need the size of the variable.           */
    /*! Padding to make the table entry size a power of 2 is necessary
        to avoid "holes" between table contributions from different object
        files on Windows when debug information is specified with /Zi.  */
    struct Entry {
        const char* name; //!< Name of the variable
        void*       addr; //!< Address of the variable

#if HOST_LIBRARY
        VAR_ALLOC_TYPE  var_alloc_type;
        uint64_t    size;
#endif
    };

    // Table terminated by an entry with name == -1
    const Entry *entries;
};

// List of var tables
class DLL_LOCAL VarList : public TableList<VarTable> {
public:
    VarList() : TableList<Table>()
    {}

    // debug dump
    void dump();

public:

    Node * get_head() {
        return m_head;
    }

public:
    // Entry representation in a copy buffer
    struct BufEntry {
        intptr_t name;
        intptr_t addr;
    };

    // Calculate the number of elements in the table and
    // returns the size of buffer for the table
    int64_t table_size(int64_t &nelems);

    // Copy table contents to given buffer. It is supposed to be large
    // enough to hold all elements as string table.
    void table_copy(void *buf, int64_t nelems);

    // Patch name offsets in a table after it's been copied to other side
    static void table_patch_names(void *buf, int64_t nelems);
};

DLL_LOCAL extern FuncList __offload_entries;
DLL_LOCAL extern FuncList __offload_funcs;
DLL_LOCAL extern VarList  __offload_vars;

// Section names where the lookup tables are stored
#ifdef TARGET_WINNT
#define OFFLOAD_ENTRY_TABLE_SECTION_START   ".OffloadEntryTable$a"
#define OFFLOAD_ENTRY_TABLE_SECTION_END     ".OffloadEntryTable$z"

#define OFFLOAD_FUNC_TABLE_SECTION_START    ".OffloadFuncTable$a"
#define OFFLOAD_FUNC_TABLE_SECTION_END      ".OffloadFuncTable$z"

#define OFFLOAD_VAR_TABLE_SECTION_START     ".OffloadVarTable$a"
#define OFFLOAD_VAR_TABLE_SECTION_END       ".OffloadVarTable$z"

#define OFFLOAD_CRTINIT_SECTION_START       ".CRT$XCT"

#pragma section(OFFLOAD_CRTINIT_SECTION_START, read)

#else  // TARGET_WINNT

#define OFFLOAD_ENTRY_TABLE_SECTION_START   ".OffloadEntryTable."
#define OFFLOAD_ENTRY_TABLE_SECTION_END     ".OffloadEntryTable."

#define OFFLOAD_FUNC_TABLE_SECTION_START    ".OffloadFuncTable."
#define OFFLOAD_FUNC_TABLE_SECTION_END      ".OffloadFuncTable."

#define OFFLOAD_VAR_TABLE_SECTION_START     ".OffloadVarTable."
#define OFFLOAD_VAR_TABLE_SECTION_END       ".OffloadVarTable."
#endif // TARGET_WINNT

#pragma section(OFFLOAD_ENTRY_TABLE_SECTION_START, read, write)
#pragma section(OFFLOAD_ENTRY_TABLE_SECTION_END, read, write)

#pragma section(OFFLOAD_FUNC_TABLE_SECTION_START, read, write)
#pragma section(OFFLOAD_FUNC_TABLE_SECTION_END, read, write)

#pragma section(OFFLOAD_VAR_TABLE_SECTION_START, read, write)
#pragma section(OFFLOAD_VAR_TABLE_SECTION_END, read, write)


// Set library version
extern "C" void __offload_set_version(int v);

// register/unregister given tables
extern "C" void __offload_register_tables(
    FuncList::Node *entry_table,
    FuncList::Node *func_table,
    VarList::Node *var_table
);

extern "C" void __offload_unregister_tables(
    FuncList::Node *entry_table,
    FuncList::Node *func_table,
    VarList::Node *var_table
);


#ifdef MYO_SUPPORT

#include <myotypes.h>
#include <myoimpl.h>
#include <myo.h>

#ifdef TARGET_WINNT
#define MYO_TABLE_END_MARKER() reinterpret_cast<const char*>(-1)
#else // TARGET_WINNT
#define MYO_TABLE_END_MARKER() reinterpret_cast<const char*>(0)
#endif // TARGET_WINNT

// Host and Target-side MYO shared variable table entry layout
typedef MyoiSharedVarEntry SharedTableEntry;

#if HOST_LIBRARY

// Host-side MYO function table entry layout
typedef struct {
    //! Function Name
    const char *funcName;
    //! Function Address
    void *funcAddr;
    //! Local Thunk Address
    void *localThunkAddr;
#ifdef TARGET_WINNT
    // Dummy to pad up to 32 bytes
    void *dummy;
#endif // TARGET_WINNT
} FptrTableEntry;

// Host-side MYO init routine table entry layout
typedef struct {
#ifdef TARGET_WINNT
    // Dummy to pad up to 16 bytes
    // Function Name
    const char *funcName;
#endif // TARGET_WINNT
    void (*func)(MyoArena);
} InitTableEntry;

#else // HOST_LIBRARY

// Target-side MYO function table entry layout
typedef MyoiTargetSharedFptrEntry   FptrTableEntry;

// Target-side MYO init routine table entry layout
struct InitTableEntry {
    void (*func)(void);
};

#endif // HOST_LIBRARY

#ifdef TARGET_WINNT

#define OFFLOAD_MYO_SHARED_TABLE_SECTION_START          ".MyoSharedTable$a"
#define OFFLOAD_MYO_SHARED_TABLE_SECTION_END            ".MyoSharedTable$z"

#define OFFLOAD_MYO_SHARED_VTABLE_SECTION_START         ".MyoSharedVTable$a"
#define OFFLOAD_MYO_SHARED_VTABLE_SECTION_END           ".MyoSharedVTable$z"

#define OFFLOAD_MYO_SHARED_INIT_TABLE_SECTION_START     ".MyoSharedInitTable$a"
#define OFFLOAD_MYO_SHARED_INIT_TABLE_SECTION_END       ".MyoSharedInitTable$z"

#define OFFLOAD_MYO_FPTR_TABLE_SECTION_START            ".MyoFptrTable$a"
#define OFFLOAD_MYO_FPTR_TABLE_SECTION_END              ".MyoFptrTable$z"

#else  // TARGET_WINNT

#define OFFLOAD_MYO_SHARED_TABLE_SECTION_START          ".MyoSharedTable."
#define OFFLOAD_MYO_SHARED_TABLE_SECTION_END            ".MyoSharedTable."

#define OFFLOAD_MYO_SHARED_VTABLE_SECTION_START         ".MyoSharedVTable."
#define OFFLOAD_MYO_SHARED_VTABLE_SECTION_END           ".MyoSharedVTable."

#define OFFLOAD_MYO_SHARED_INIT_TABLE_SECTION_START     ".MyoSharedInitTable."
#define OFFLOAD_MYO_SHARED_INIT_TABLE_SECTION_END       ".MyoSharedInitTable."

#define OFFLOAD_MYO_FPTR_TABLE_SECTION_START            ".MyoFptrTable."
#define OFFLOAD_MYO_FPTR_TABLE_SECTION_END              ".MyoFptrTable."

#endif // TARGET_WINNT

#pragma section(OFFLOAD_MYO_SHARED_TABLE_SECTION_START, read, write)
#pragma section(OFFLOAD_MYO_SHARED_TABLE_SECTION_END, read, write)

#pragma section(OFFLOAD_MYO_SHARED_VTABLE_SECTION_START, read, write)
#pragma section(OFFLOAD_MYO_SHARED_VTABLE_SECTION_END, read, write)

#pragma section(OFFLOAD_MYO_SHARED_INIT_TABLE_SECTION_START, read, write)
#pragma section(OFFLOAD_MYO_SHARED_INIT_TABLE_SECTION_END, read, write)

#pragma section(OFFLOAD_MYO_FPTR_TABLE_SECTION_START, read, write)
#pragma section(OFFLOAD_MYO_FPTR_TABLE_SECTION_END, read, write)

// List of MYO shared variable tables
struct MYOVarTable {
    typedef SharedTableEntry Entry;
    const Entry *entries;
};

class MYOVarTableList : public TableList<MYOVarTable> {
public:
    MYOVarTableList() : TableList<Table>()
    {}

    // add table to the list
    void add_table(Node *node) {
        // add table
        TableList<Table>::add_table(node);
    }

    // debug dump
    void dump(void);

    // check if any shared variables
    bool is_empty();

    // process the table contents for ordinary variables
    void process();

    // process the table contents for vtable objects
    void process_vtable();
};

// List of MYO shared function tables
struct MYOFuncTable {
    typedef FptrTableEntry Entry;
    const Entry *entries;
};

class MYOFuncTableList : public TableList<MYOFuncTable> {
public:
    MYOFuncTableList() : TableList<Table>()
    {}

    // add table to the list
    void add_table(Node *node) {
        // add table
        TableList<Table>::add_table(node);
    }

    // debug dump
    void dump(void);

    // check if any shared functions
    bool is_empty();

    // process the table contents
    void process();
};

// List of MYO shared variable initialization routine tables
struct MYOInitTable {
    typedef InitTableEntry Entry;
    const Entry *entries;
};

class MYOInitTableList : public TableList<MYOInitTable> {
public:
    MYOInitTableList() : TableList<Table>()
    {}

    // add table to the list
    void add_table(Node *node) {
        // add table
        TableList<Table>::add_table(node);
    }

    // debug dump
    void dump(void);

    // check if any init routines
    bool is_empty();

    // process the table contents
    void process();
};

extern MYOVarTableList  __offload_myo_var_tables;
extern MYOVarTableList  __offload_myo_vtable_tables;
extern MYOFuncTableList __offload_myo_func_tables;
extern MYOInitTableList __offload_myo_init_tables;

extern "C" void __offload_myoRegisterTables1(
    MYOInitTableList::Node *init_table,
    MYOVarTableList::Node  *shared_table,
    MYOVarTableList::Node  *shared_vtable,
    MYOFuncTableList::Node *fptr_table
); 

extern "C" void __offload_myoRemoveTables(
    MYOInitTableList::Node *init_table,
    MYOVarTableList::Node  *shared_table,
    MYOVarTableList::Node  *shared_vtable,
    MYOFuncTableList::Node *fptr_table
);

#endif // MYO_SUPPORT

#endif  // OFFLOAD_TABLE_H_INCLUDED