forked from mia/Aegisub
172 lines
4.0 KiB
C
172 lines
4.0 KiB
C
/*
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** FFI C call handling.
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** Copyright (C) 2005-2017 Mike Pall. See Copyright Notice in luajit.h
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*/
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#ifndef _LJ_CCALL_H
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#define _LJ_CCALL_H
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#include "lj_obj.h"
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#include "lj_ctype.h"
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#if LJ_HASFFI
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/* -- C calling conventions ----------------------------------------------- */
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#if LJ_TARGET_X86ORX64
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#if LJ_TARGET_X86
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#define CCALL_NARG_GPR 2 /* For fastcall arguments. */
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#define CCALL_NARG_FPR 0
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#define CCALL_NRET_GPR 2
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#define CCALL_NRET_FPR 1 /* For FP results on x87 stack. */
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#define CCALL_ALIGN_STACKARG 0 /* Don't align argument on stack. */
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#elif LJ_ABI_WIN
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#define CCALL_NARG_GPR 4
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#define CCALL_NARG_FPR 4
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#define CCALL_NRET_GPR 1
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#define CCALL_NRET_FPR 1
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#define CCALL_SPS_EXTRA 4
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#else
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#define CCALL_NARG_GPR 6
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#define CCALL_NARG_FPR 8
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#define CCALL_NRET_GPR 2
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#define CCALL_NRET_FPR 2
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#define CCALL_VECTOR_REG 1 /* Pass vectors in registers. */
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#endif
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#define CCALL_SPS_FREE 1
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#define CCALL_ALIGN_CALLSTATE 16
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typedef LJ_ALIGN(16) union FPRArg {
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double d[2];
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float f[4];
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uint8_t b[16];
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uint16_t s[8];
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int i[4];
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int64_t l[2];
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} FPRArg;
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typedef intptr_t GPRArg;
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#elif LJ_TARGET_ARM
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#define CCALL_NARG_GPR 4
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#define CCALL_NRET_GPR 2 /* For softfp double. */
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#if LJ_ABI_SOFTFP
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#define CCALL_NARG_FPR 0
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#define CCALL_NRET_FPR 0
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#else
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#define CCALL_NARG_FPR 8
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#define CCALL_NRET_FPR 4
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#endif
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#define CCALL_SPS_FREE 0
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typedef intptr_t GPRArg;
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typedef union FPRArg {
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double d;
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float f[2];
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} FPRArg;
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#elif LJ_TARGET_PPC
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#define CCALL_NARG_GPR 8
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#define CCALL_NARG_FPR 8
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#define CCALL_NRET_GPR 4 /* For complex double. */
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#define CCALL_NRET_FPR 1
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#define CCALL_SPS_EXTRA 4
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#define CCALL_SPS_FREE 0
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typedef intptr_t GPRArg;
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typedef double FPRArg;
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#elif LJ_TARGET_PPCSPE
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#define CCALL_NARG_GPR 8
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#define CCALL_NARG_FPR 0
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#define CCALL_NRET_GPR 4 /* For softfp complex double. */
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#define CCALL_NRET_FPR 0
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#define CCALL_SPS_FREE 0 /* NYI */
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typedef intptr_t GPRArg;
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#elif LJ_TARGET_MIPS
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#define CCALL_NARG_GPR 4
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#define CCALL_NARG_FPR 2
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#define CCALL_NRET_GPR 2
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#define CCALL_NRET_FPR 2
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#define CCALL_SPS_EXTRA 7
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#define CCALL_SPS_FREE 1
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typedef intptr_t GPRArg;
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typedef union FPRArg {
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double d;
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struct { LJ_ENDIAN_LOHI(float f; , float g;) };
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} FPRArg;
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#else
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#error "Missing calling convention definitions for this architecture"
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#endif
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#ifndef CCALL_SPS_EXTRA
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#define CCALL_SPS_EXTRA 0
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#endif
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#ifndef CCALL_VECTOR_REG
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#define CCALL_VECTOR_REG 0
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#endif
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#ifndef CCALL_ALIGN_STACKARG
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#define CCALL_ALIGN_STACKARG 1
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#endif
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#ifndef CCALL_ALIGN_CALLSTATE
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#define CCALL_ALIGN_CALLSTATE 8
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#endif
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#define CCALL_NUM_GPR \
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(CCALL_NARG_GPR > CCALL_NRET_GPR ? CCALL_NARG_GPR : CCALL_NRET_GPR)
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#define CCALL_NUM_FPR \
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(CCALL_NARG_FPR > CCALL_NRET_FPR ? CCALL_NARG_FPR : CCALL_NRET_FPR)
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/* Check against constants in lj_ctype.h. */
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LJ_STATIC_ASSERT(CCALL_NUM_GPR <= CCALL_MAX_GPR);
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LJ_STATIC_ASSERT(CCALL_NUM_FPR <= CCALL_MAX_FPR);
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#define CCALL_MAXSTACK 32
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/* -- C call state -------------------------------------------------------- */
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typedef LJ_ALIGN(CCALL_ALIGN_CALLSTATE) struct CCallState {
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void (*func)(void); /* Pointer to called function. */
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uint32_t spadj; /* Stack pointer adjustment. */
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uint8_t nsp; /* Number of stack slots. */
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uint8_t retref; /* Return value by reference. */
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#if LJ_TARGET_X64
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uint8_t ngpr; /* Number of arguments in GPRs. */
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uint8_t nfpr; /* Number of arguments in FPRs. */
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#elif LJ_TARGET_X86
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uint8_t resx87; /* Result on x87 stack: 1:float, 2:double. */
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#elif LJ_TARGET_PPC
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uint8_t nfpr; /* Number of arguments in FPRs. */
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#endif
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#if LJ_32
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int32_t align1;
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#endif
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#if CCALL_NUM_FPR
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FPRArg fpr[CCALL_NUM_FPR]; /* Arguments/results in FPRs. */
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#endif
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GPRArg gpr[CCALL_NUM_GPR]; /* Arguments/results in GPRs. */
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GPRArg stack[CCALL_MAXSTACK]; /* Stack slots. */
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} CCallState;
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/* -- C call handling ----------------------------------------------------- */
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/* Really belongs to lj_vm.h. */
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LJ_ASMF void LJ_FASTCALL lj_vm_ffi_call(CCallState *cc);
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LJ_FUNC CTypeID lj_ccall_ctid_vararg(CTState *cts, cTValue *o);
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LJ_FUNC int lj_ccall_func(lua_State *L, GCcdata *cd);
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#endif
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#endif
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