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/*
* Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2020, 2022, Huawei Technologies Co., Ltd. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef CPU_RISCV_FRAME_RISCV_HPP
#define CPU_RISCV_FRAME_RISCV_HPP
// A frame represents a physical stack frame (an activation). Frames can be
// C or Java frames, and the Java frames can be interpreted or compiled.
// In contrast, vframes represent source-level activations, so that one physical frame
// can correspond to multiple source level frames because of inlining.
// A frame is comprised of {pc, fp, sp}
// ------------------------------ Asm interpreter ----------------------------------------
// Layout of asm interpreter frame:
// [expression stack ] * <- sp
// [monitors[0] ] \
// ... | monitor block size = k
// [monitors[k-1] ] /
// [frame initial esp ] ( == &monitors[0], initially here) initial_sp_offset
// [byte code index/pointr] = bcx() bcx_offset
// [pointer to locals ] = locals() locals_offset
// [constant pool cache ] = cache() cache_offset
// [klass of method ] = mirror() mirror_offset
// [extended SP ] extended_sp offset
// [methodData ] = mdp() mdx_offset
// [Method ] = method() method_offset
// [last esp ] = last_sp() last_sp_offset
// [sender's SP ] (sender_sp) sender_sp_offset
// [old frame pointer ]
// [return pc ]
// [last sp ] <- fp = link()
// [oop temp ] (only for native calls)
// [padding ] (to preserve machine SP alignment)
// [locals and parameters ]
// <- sender sp
// ------------------------------ Asm interpreter ----------------------------------------
// ------------------------------ C Frame ------------------------------------------------
// Stack: gcc with -fno-omit-frame-pointer
// .
// .
// +-> .
// | +-----------------+ |
// | | return address | |
// | | previous fp ------+
// | | saved registers |
// | | local variables |
// | | ... | <-+
// | +-----------------+ |
// | | return address | |
// +------ previous fp | |
// | saved registers | |
// | local variables | |
// +-> | ... | |
// | +-----------------+ |
// | | return address | |
// | | previous fp ------+
// | | saved registers |
// | | local variables |
// | | ... | <-+
// | +-----------------+ |
// | | return address | |
// +------ previous fp | |
// | saved registers | |
// | local variables | |
// $fp --> | ... | |
// +-----------------+ |
// | return address | |
// | previous fp ------+
// | saved registers |
// $sp --> | local variables |
// +-----------------+
// ------------------------------ C Frame ------------------------------------------------
public:
enum {
pc_return_offset = 0,
// All frames
link_offset = -2,
return_addr_offset = -1,
sender_sp_offset = 0,
// Interpreter frames
interpreter_frame_oop_temp_offset = 1, // for native calls only
interpreter_frame_sender_sp_offset = -3,
// outgoing sp before a call to an invoked method
interpreter_frame_last_sp_offset = interpreter_frame_sender_sp_offset - 1,
interpreter_frame_method_offset = interpreter_frame_last_sp_offset - 1,
interpreter_frame_mdp_offset = interpreter_frame_method_offset - 1,
interpreter_frame_extended_sp_offset = interpreter_frame_mdp_offset - 1,
interpreter_frame_mirror_offset = interpreter_frame_extended_sp_offset - 1,
interpreter_frame_cache_offset = interpreter_frame_mirror_offset - 1,
interpreter_frame_locals_offset = interpreter_frame_cache_offset - 1,
interpreter_frame_bcp_offset = interpreter_frame_locals_offset - 1,
interpreter_frame_initial_sp_offset = interpreter_frame_bcp_offset - 1,
interpreter_frame_monitor_block_top_offset = interpreter_frame_initial_sp_offset,
interpreter_frame_monitor_block_bottom_offset = interpreter_frame_initial_sp_offset,
// Entry frames
// n.b. these values are determined by the layout defined in
// stubGenerator for the Java call stub
entry_frame_after_call_words = 34,
entry_frame_call_wrapper_offset = -10,
// we don't need a save area
arg_reg_save_area_bytes = 0,
// size, in words, of frame metadata (e.g. pc and link)
metadata_words = 2,
// size, in words, of metadata at frame bottom, i.e. it is not part of the
// caller/callee overlap
metadata_words_at_bottom = metadata_words,
// size, in words, of frame metadata at the frame top, i.e. it is located
// between a callee frame and its stack arguments, where it is part
// of the caller/callee overlap
metadata_words_at_top = 0,
// in bytes
frame_alignment = 16,
// size, in words, of maximum shift in frame position due to alignment
align_wiggle = 1
};
intptr_t ptr_at(int offset) const {
return *ptr_at_addr(offset);
}
void ptr_at_put(int offset, intptr_t value) {
*ptr_at_addr(offset) = value;
}
private:
// an additional field beyond _sp and _pc:
union {
intptr_t* _fp; // frame pointer
int _offset_fp; // relative frame pointer for use in stack-chunk frames
};
// The interpreter and adapters will extend the frame of the caller.
// Since oopMaps are based on the sp of the caller before extension
// we need to know that value. However in order to compute the address
// of the return address we need the real "raw" sp. Since sparc already
// uses sp() to mean "raw" sp and unextended_sp() to mean the caller's
// original sp we use that convention.
union {
intptr_t* _unextended_sp;
int _offset_unextended_sp; // for use in stack-chunk frames
};
void adjust_unextended_sp() NOT_DEBUG_RETURN;
intptr_t* ptr_at_addr(int offset) const {
return (intptr_t*) addr_at(offset);
}
#ifdef ASSERT
// Used in frame::sender_for_{interpreter,compiled}_frame
static void verify_deopt_original_pc(CompiledMethod* nm, intptr_t* unextended_sp);
#endif
const ImmutableOopMap* get_oop_map() const;
public:
// Constructors
frame(intptr_t* ptr_sp, intptr_t* ptr_fp, address pc);
frame(intptr_t* ptr_sp, intptr_t* unextended_sp, intptr_t* ptr_fp, address pc);
frame(intptr_t* sp, intptr_t* unextended_sp, intptr_t* fp, address pc, CodeBlob* cb);
// used for fast frame construction by continuations
frame(intptr_t* sp, intptr_t* unextended_sp, intptr_t* fp, address pc, CodeBlob* cb, const ImmutableOopMap* oop_map, bool on_heap);
frame(intptr_t* ptr_sp, intptr_t* ptr_fp);
void init(intptr_t* ptr_sp, intptr_t* ptr_fp, address pc);
void setup(address pc);
// accessors for the instance variables
// Note: not necessarily the real 'frame pointer' (see real_fp)
intptr_t* fp() const { assert_absolute(); return _fp; }
void set_fp(intptr_t* newfp) { _fp = newfp; }
int offset_fp() const { assert_offset(); return _offset_fp; }
void set_offset_fp(int value) { assert_on_heap(); _offset_fp = value; }
inline address* sender_pc_addr() const;
// expression stack tos if we are nested in a java call
intptr_t* interpreter_frame_last_sp() const;
void interpreter_frame_set_extended_sp(intptr_t* sp);
template <typename RegisterMapT>
static void update_map_with_saved_link(RegisterMapT* map, intptr_t** link_addr);
// deoptimization support
void interpreter_frame_set_last_sp(intptr_t* last_sp);
static jint interpreter_frame_expression_stack_direction() { return -1; }
// returns the sending frame, without applying any barriers
inline frame sender_raw(RegisterMap* map) const;
#endif // CPU_RISCV_FRAME_RISCV_HPP
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