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/*
** Stack frames.
** Copyright (C) 2005-2015 Mike Pall. See Copyright Notice in luajit.h
*/
#ifndef _LJ_FRAME_H
#define _LJ_FRAME_H
#include "lj_obj.h"
#include "lj_bc.h"
/* -- Lua stack frame ----------------------------------------------------- */
/* Frame type markers in LSB of PC (4-byte aligned) or delta (8-byte aligned:
**
** PC 00 Lua frame
** delta 001 C frame
** delta 010 Continuation frame
** delta 011 Lua vararg frame
** delta 101 cpcall() frame
** delta 110 ff pcall() frame
** delta 111 ff pcall() frame with active hook
*/
enum {
FRAME_LUA, FRAME_C, FRAME_CONT, FRAME_VARG,
FRAME_LUAP, FRAME_CP, FRAME_PCALL, FRAME_PCALLH
};
#define FRAME_TYPE 3
#define FRAME_P 4
#define FRAME_TYPEP (FRAME_TYPE|FRAME_P)
/* Macros to access and modify Lua frames. */
#if LJ_FR2
/* Two-slot frame info, required for 64 bit PC/GCRef:
**
** base-2 base-1 | base base+1 ...
** [func PC/delta/ft] | [slots ...]
** ^-- frame | ^-- base ^-- top
**
** Continuation frames:
**
** base-4 base-3 base-2 base-1 | base base+1 ...
** [cont PC ] [func PC/delta/ft] | [slots ...]
** ^-- frame | ^-- base ^-- top
*/
#define frame_gc(f) (gcval((f)-1))
#define frame_ftsz(f) ((ptrdiff_t)(f)->ftsz)
#define frame_pc(f) ((const BCIns *)frame_ftsz(f))
#define setframe_gc(f, p, tp) (setgcVraw((f)-1, (p), (tp)))
#define setframe_ftsz(f, sz) ((f)->ftsz = (sz))
#define setframe_pc(f, pc) ((f)->ftsz = (int64_t)(intptr_t)(pc))
#else
/* One-slot frame info, sufficient for 32 bit PC/GCRef:
**
** base-1 | base base+1 ...
** lo hi |
** [func | PC/delta/ft] | [slots ...]
** ^-- frame | ^-- base ^-- top
**
** Continuation frames:
**
** base-2 base-1 | base base+1 ...
** lo hi lo hi |
** [cont | PC] [func | PC/delta/ft] | [slots ...]
** ^-- frame | ^-- base ^-- top
*/
#define frame_gc(f) (gcref((f)->fr.func))
#define frame_ftsz(f) ((ptrdiff_t)(f)->fr.tp.ftsz)
#define frame_pc(f) (mref((f)->fr.tp.pcr, const BCIns))
#define setframe_gc(f, p, tp) (setgcref((f)->fr.func, (p)), UNUSED(tp))
#define setframe_ftsz(f, sz) ((f)->fr.tp.ftsz = (int32_t)(sz))
#define setframe_pc(f, pc) (setmref((f)->fr.tp.pcr, (pc)))
#endif
#define frame_type(f) (frame_ftsz(f) & FRAME_TYPE)
#define frame_typep(f) (frame_ftsz(f) & FRAME_TYPEP)
#define frame_islua(f) (frame_type(f) == FRAME_LUA)
#define frame_isc(f) (frame_type(f) == FRAME_C)
#define frame_iscont(f) (frame_typep(f) == FRAME_CONT)
#define frame_isvarg(f) (frame_typep(f) == FRAME_VARG)
#define frame_ispcall(f) ((frame_ftsz(f) & 6) == FRAME_PCALL)
#define frame_func(f) (&frame_gc(f)->fn)
#define frame_delta(f) (frame_ftsz(f) >> 3)
#define frame_sized(f) (frame_ftsz(f) & ~FRAME_TYPEP)
enum { LJ_CONT_TAILCALL, LJ_CONT_FFI_CALLBACK }; /* Special continuations. */
#if LJ_FR2
#define frame_contpc(f) (frame_pc((f)-2))
#define frame_contv(f) (((f)-3)->u64)
#else
#define frame_contpc(f) (frame_pc((f)-1))
#define frame_contv(f) (((f)-1)->u32.lo)
#endif
#if LJ_FR2
#define frame_contf(f) ((ASMFunction)(uintptr_t)((f)-3)->u64)
#elif LJ_64
#define frame_contf(f) \
((ASMFunction)(void *)((intptr_t)lj_vm_asm_begin + \
(intptr_t)(int32_t)((f)-1)->u32.lo))
#else
#define frame_contf(f) ((ASMFunction)gcrefp(((f)-1)->gcr, void))
#endif
#define frame_iscont_fficb(f) \
(LJ_HASFFI && frame_contv(f) == LJ_CONT_FFI_CALLBACK)
#define frame_prevl(f) ((f) - (1+LJ_FR2+bc_a(frame_pc(f)[-1])))
#define frame_prevd(f) ((TValue *)((char *)(f) - frame_sized(f)))
#define frame_prev(f) (frame_islua(f)?frame_prevl(f):frame_prevd(f))
/* Note: this macro does not skip over FRAME_VARG. */
/* -- C stack frame ------------------------------------------------------- */
/* Macros to access and modify the C stack frame chain. */
/* These definitions must match with the arch-specific *.dasc files. */
#if LJ_TARGET_X86
#define CFRAME_OFS_ERRF (15*4)
#define CFRAME_OFS_NRES (14*4)
#define CFRAME_OFS_PREV (13*4)
#define CFRAME_OFS_L (12*4)
#define CFRAME_OFS_PC (6*4)
#define CFRAME_OFS_MULTRES (5*4)
#define CFRAME_SIZE (12*4)
#define CFRAME_SHIFT_MULTRES 0
#elif LJ_TARGET_X64
#if LJ_ABI_WIN
#define CFRAME_OFS_PREV (13*8)
#if LJ_GC64
#define CFRAME_OFS_PC (12*8)
#define CFRAME_OFS_L (11*8)
#define CFRAME_OFS_ERRF (21*4)
#define CFRAME_OFS_NRES (20*4)
#define CFRAME_OFS_MULTRES (8*4)
#else
#define CFRAME_OFS_PC (25*4)
#define CFRAME_OFS_L (24*4)
#define CFRAME_OFS_ERRF (23*4)
#define CFRAME_OFS_NRES (22*4)
#define CFRAME_OFS_MULTRES (21*4)
#endif
#define CFRAME_SIZE (10*8)
#define CFRAME_SIZE_JIT (CFRAME_SIZE + 9*16 + 4*8)
#define CFRAME_SHIFT_MULTRES 0
#else
#define CFRAME_OFS_PREV (4*8)
#if LJ_GC64
#define CFRAME_OFS_PC (3*8)
#define CFRAME_OFS_L (2*8)
#define CFRAME_OFS_ERRF (3*4)
#define CFRAME_OFS_NRES (2*4)
#define CFRAME_OFS_MULTRES (0*4)
#else
#define CFRAME_OFS_PC (7*4)
#define CFRAME_OFS_L (6*4)
#define CFRAME_OFS_ERRF (5*4)
#define CFRAME_OFS_NRES (4*4)
#define CFRAME_OFS_MULTRES (1*4)
#endif
#if LJ_NO_UNWIND
#define CFRAME_SIZE (12*8)
#else
#define CFRAME_SIZE (10*8)
#endif
#define CFRAME_SIZE_JIT (CFRAME_SIZE + 16)
#define CFRAME_SHIFT_MULTRES 0
#endif
#elif LJ_TARGET_ARM
#define CFRAME_OFS_ERRF 24
#define CFRAME_OFS_NRES 20
#define CFRAME_OFS_PREV 16
#define CFRAME_OFS_L 12
#define CFRAME_OFS_PC 8
#define CFRAME_OFS_MULTRES 4
#if LJ_ARCH_HASFPU
#define CFRAME_SIZE 128
#else
#define CFRAME_SIZE 64
#endif
#define CFRAME_SHIFT_MULTRES 3
#elif LJ_TARGET_ARM64
#define CFRAME_OFS_ERRF 196
#define CFRAME_OFS_NRES 200
#define CFRAME_OFS_PREV 160
#define CFRAME_OFS_L 176
#define CFRAME_OFS_PC 168
#define CFRAME_OFS_MULTRES 192
#define CFRAME_SIZE 208
#define CFRAME_SHIFT_MULTRES 3
#elif LJ_TARGET_PPC
#if LJ_TARGET_XBOX360
#define CFRAME_OFS_ERRF 424
#define CFRAME_OFS_NRES 420
#define CFRAME_OFS_PREV 400
#define CFRAME_OFS_L 416
#define CFRAME_OFS_PC 412
#define CFRAME_OFS_MULTRES 408
#define CFRAME_SIZE 384
#define CFRAME_SHIFT_MULTRES 3
#elif LJ_ARCH_PPC32ON64
#define CFRAME_OFS_ERRF 472
#define CFRAME_OFS_NRES 468
#define CFRAME_OFS_PREV 448
#define CFRAME_OFS_L 464
#define CFRAME_OFS_PC 460
#define CFRAME_OFS_MULTRES 456
#define CFRAME_SIZE 400
#define CFRAME_SHIFT_MULTRES 3
#else
#define CFRAME_OFS_ERRF 48
#define CFRAME_OFS_NRES 44
#define CFRAME_OFS_PREV 40
#define CFRAME_OFS_L 36
#define CFRAME_OFS_PC 32
#define CFRAME_OFS_MULTRES 28
#define CFRAME_SIZE 272
#define CFRAME_SHIFT_MULTRES 3
#endif
#elif LJ_TARGET_MIPS
#define CFRAME_OFS_ERRF 124
#define CFRAME_OFS_NRES 120
#define CFRAME_OFS_PREV 116
#define CFRAME_OFS_L 112
#define CFRAME_OFS_PC 20
#define CFRAME_OFS_MULTRES 16
#define CFRAME_SIZE 112
#define CFRAME_SHIFT_MULTRES 3
#else
#error "Missing CFRAME_* definitions for this architecture"
#endif
#ifndef CFRAME_SIZE_JIT
#define CFRAME_SIZE_JIT CFRAME_SIZE
#endif
#define CFRAME_RESUME 1
#define CFRAME_UNWIND_FF 2 /* Only used in unwinder. */
#define CFRAME_RAWMASK (~(intptr_t)(CFRAME_RESUME|CFRAME_UNWIND_FF))
#define cframe_errfunc(cf) (*(int32_t *)(((char *)(cf))+CFRAME_OFS_ERRF))
#define cframe_nres(cf) (*(int32_t *)(((char *)(cf))+CFRAME_OFS_NRES))
#define cframe_prev(cf) (*(void **)(((char *)(cf))+CFRAME_OFS_PREV))
#define cframe_multres(cf) (*(uint32_t *)(((char *)(cf))+CFRAME_OFS_MULTRES))
#define cframe_multres_n(cf) (cframe_multres((cf)) >> CFRAME_SHIFT_MULTRES)
#define cframe_L(cf) \
(&gcref(*(GCRef *)(((char *)(cf))+CFRAME_OFS_L))->th)
#define cframe_pc(cf) \
(mref(*(MRef *)(((char *)(cf))+CFRAME_OFS_PC), const BCIns))
#define setcframe_L(cf, L) \
(setmref(*(MRef *)(((char *)(cf))+CFRAME_OFS_L), (L)))
#define setcframe_pc(cf, pc) \
(setmref(*(MRef *)(((char *)(cf))+CFRAME_OFS_PC), (pc)))
#define cframe_canyield(cf) ((intptr_t)(cf) & CFRAME_RESUME)
#define cframe_unwind_ff(cf) ((intptr_t)(cf) & CFRAME_UNWIND_FF)
#define cframe_raw(cf) ((void *)((intptr_t)(cf) & CFRAME_RAWMASK))
#define cframe_Lpc(L) cframe_pc(cframe_raw(L->cframe))
#endif
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