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/*
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 * Tiny Code Generator for QEMU
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 *
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 * Copyright (c) 2008 Fabrice Bellard
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to deal
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 * in the Software without restriction, including without limitation the rights
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 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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 * copies of the Software, and to permit persons to whom the Software is
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 * furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included in
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 * all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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 * THE SOFTWARE.
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 */
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#include "qemu-common.h"
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#include "tcg-target.h"
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#include "tcg-runtime.h"
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#if TCG_TARGET_REG_BITS == 32
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typedef int32_t tcg_target_long;
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typedef uint32_t tcg_target_ulong;
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#define TCG_PRIlx PRIx32
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#define TCG_PRIld PRId32
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#elif TCG_TARGET_REG_BITS == 64
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typedef int64_t tcg_target_long;
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typedef uint64_t tcg_target_ulong;
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#define TCG_PRIlx PRIx64
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#define TCG_PRIld PRId64
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#else
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#error unsupported
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#endif
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#if TCG_TARGET_NB_REGS <= 32
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typedef uint32_t TCGRegSet;
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#elif TCG_TARGET_NB_REGS <= 64
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typedef uint64_t TCGRegSet;
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#else
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#error unsupported
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#endif
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typedef enum TCGOpcode {
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#define DEF(name, oargs, iargs, cargs, flags) INDEX_op_ ## name,
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#include "tcg-opc.h"
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#undef DEF
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    NB_OPS,
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} TCGOpcode;
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#define tcg_regset_clear(d) (d) = 0
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#define tcg_regset_set(d, s) (d) = (s)
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#define tcg_regset_set32(d, reg, val32) (d) |= (val32) << (reg)
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#define tcg_regset_set_reg(d, r) (d) |= 1L << (r)
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#define tcg_regset_reset_reg(d, r) (d) &= ~(1L << (r))
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#define tcg_regset_test_reg(d, r) (((d) >> (r)) & 1)
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#define tcg_regset_or(d, a, b) (d) = (a) | (b)
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#define tcg_regset_and(d, a, b) (d) = (a) & (b)
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#define tcg_regset_andnot(d, a, b) (d) = (a) & ~(b)
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#define tcg_regset_not(d, a) (d) = ~(a)
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typedef struct TCGRelocation {
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    struct TCGRelocation *next;
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    int type;
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    uint8_t *ptr;
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    tcg_target_long addend;
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} TCGRelocation; 
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typedef struct TCGLabel {
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    int has_value;
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    union {
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        tcg_target_ulong value;
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        TCGRelocation *first_reloc;
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    } u;
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} TCGLabel;
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typedef struct TCGPool {
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    struct TCGPool *next;
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    int size;
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    uint8_t data[0] __attribute__ ((aligned));
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} TCGPool;
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#define TCG_POOL_CHUNK_SIZE 32768
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#define TCG_MAX_LABELS 512
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#define TCG_MAX_TEMPS 512
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/* when the size of the arguments of a called function is smaller than
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   this value, they are statically allocated in the TB stack frame */
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#define TCG_STATIC_CALL_ARGS_SIZE 128
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typedef enum TCGType {
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    TCG_TYPE_I32,
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    TCG_TYPE_I64,
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    TCG_TYPE_COUNT, /* number of different types */
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    /* An alias for the size of the host register.  */
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#if TCG_TARGET_REG_BITS == 32
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    TCG_TYPE_REG = TCG_TYPE_I32,
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#else
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    TCG_TYPE_REG = TCG_TYPE_I64,
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#endif
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    /* An alias for the size of the native pointer.  We don't currently
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       support any hosts with 64-bit registers and 32-bit pointers.  */
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    TCG_TYPE_PTR = TCG_TYPE_REG,
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    /* An alias for the size of the target "long", aka register.  */
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#if TARGET_LONG_BITS == 64
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    TCG_TYPE_TL = TCG_TYPE_I64,
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#else
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    TCG_TYPE_TL = TCG_TYPE_I32,
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#endif
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} TCGType;
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typedef tcg_target_ulong TCGArg;
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/* Define a type and accessor macros for varables.  Using a struct is
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   nice because it gives some level of type safely.  Ideally the compiler
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   be able to see through all this.  However in practice this is not true,
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   expecially on targets with braindamaged ABIs (e.g. i386).
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   We use plain int by default to avoid this runtime overhead.
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   Users of tcg_gen_* don't need to know about any of this, and should
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   treat TCGv as an opaque type.
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   In additon we do typechecking for different types of variables.  TCGv_i32
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   and TCGv_i64 are 32/64-bit variables respectively.  TCGv and TCGv_ptr
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   are aliases for target_ulong and host pointer sized values respectively.
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 */
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#ifdef CONFIG_DEBUG_TCG
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#define DEBUG_TCGV 1
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#endif
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#ifdef DEBUG_TCGV
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typedef struct
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{
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    int i32;
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} TCGv_i32;
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typedef struct
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{
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    int i64;
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} TCGv_i64;
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#define MAKE_TCGV_I32(i) __extension__                  \
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    ({ TCGv_i32 make_tcgv_tmp = {i}; make_tcgv_tmp;})
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#define MAKE_TCGV_I64(i) __extension__                  \
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    ({ TCGv_i64 make_tcgv_tmp = {i}; make_tcgv_tmp;})
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#define GET_TCGV_I32(t) ((t).i32)
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#define GET_TCGV_I64(t) ((t).i64)
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#if TCG_TARGET_REG_BITS == 32
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#define TCGV_LOW(t) MAKE_TCGV_I32(GET_TCGV_I64(t))
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#define TCGV_HIGH(t) MAKE_TCGV_I32(GET_TCGV_I64(t) + 1)
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#endif
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#else /* !DEBUG_TCGV */
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typedef int TCGv_i32;
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typedef int TCGv_i64;
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#define MAKE_TCGV_I32(x) (x)
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#define MAKE_TCGV_I64(x) (x)
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#define GET_TCGV_I32(t) (t)
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#define GET_TCGV_I64(t) (t)
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#if TCG_TARGET_REG_BITS == 32
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#define TCGV_LOW(t) (t)
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#define TCGV_HIGH(t) ((t) + 1)
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#endif
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#endif /* DEBUG_TCGV */
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#define TCGV_EQUAL_I32(a, b) (GET_TCGV_I32(a) == GET_TCGV_I32(b))
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#define TCGV_EQUAL_I64(a, b) (GET_TCGV_I64(a) == GET_TCGV_I64(b))
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/* Dummy definition to avoid compiler warnings.  */
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#define TCGV_UNUSED_I32(x) x = MAKE_TCGV_I32(-1)
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#define TCGV_UNUSED_I64(x) x = MAKE_TCGV_I64(-1)
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/* call flags */
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#define TCG_CALL_TYPE_MASK      0x000f
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#define TCG_CALL_TYPE_STD       0x0000 /* standard C call */
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#define TCG_CALL_TYPE_REGPARM_1 0x0001 /* i386 style regparm call (1 reg) */
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#define TCG_CALL_TYPE_REGPARM_2 0x0002 /* i386 style regparm call (2 regs) */
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#define TCG_CALL_TYPE_REGPARM   0x0003 /* i386 style regparm call (3 regs) */
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/* A pure function only reads its arguments and TCG global variables
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   and cannot raise exceptions. Hence a call to a pure function can be
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   safely suppressed if the return value is not used. */
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#define TCG_CALL_PURE           0x0010 
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/* A const function only reads its arguments and does not use TCG
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   global variables. Hence a call to such a function does not
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   save TCG global variables back to their canonical location. */
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#define TCG_CALL_CONST          0x0020
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/* used to align parameters */
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#define TCG_CALL_DUMMY_TCGV     MAKE_TCGV_I32(-1)
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#define TCG_CALL_DUMMY_ARG      ((TCGArg)(-1))
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typedef enum {
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    TCG_COND_EQ,
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    TCG_COND_NE,
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    TCG_COND_LT,
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    TCG_COND_GE,
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    TCG_COND_LE,
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    TCG_COND_GT,
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    /* unsigned */
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    TCG_COND_LTU,
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    TCG_COND_GEU,
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    TCG_COND_LEU,
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    TCG_COND_GTU,
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} TCGCond;
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/* Invert the sense of the comparison.  */
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static inline TCGCond tcg_invert_cond(TCGCond c)
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{
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    return (TCGCond)(c ^ 1);
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}
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/* Swap the operands in a comparison.  */
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static inline TCGCond tcg_swap_cond(TCGCond c)
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{
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    int mask = (c < TCG_COND_LT ? 0 : c < TCG_COND_LTU ? 7 : 15);
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    return (TCGCond)(c ^ mask);
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}
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static inline TCGCond tcg_unsigned_cond(TCGCond c)
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{
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    return (c >= TCG_COND_LT && c <= TCG_COND_GT ? c + 4 : c);
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}
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#define TEMP_VAL_DEAD  0
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#define TEMP_VAL_REG   1
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#define TEMP_VAL_MEM   2
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#define TEMP_VAL_CONST 3
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/* XXX: optimize memory layout */
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typedef struct TCGTemp {
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    TCGType base_type;
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    TCGType type;
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    int val_type;
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    int reg;
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    tcg_target_long val;
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    int mem_reg;
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    tcg_target_long mem_offset;
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    unsigned int fixed_reg:1;
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    unsigned int mem_coherent:1;
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    unsigned int mem_allocated:1;
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    unsigned int temp_local:1; /* If true, the temp is saved accross
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                                  basic blocks. Otherwise, it is not
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                                  preserved accross basic blocks. */
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    unsigned int temp_allocated:1; /* never used for code gen */
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    /* index of next free temp of same base type, -1 if end */
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    int next_free_temp;
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    const char *name;
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} TCGTemp;
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typedef struct TCGHelperInfo {
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    tcg_target_ulong func;
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    const char *name;
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} TCGHelperInfo;
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typedef struct TCGContext TCGContext;
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struct TCGContext {
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    uint8_t *pool_cur, *pool_end;
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    TCGPool *pool_first, *pool_current;
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    TCGLabel *labels;
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    int nb_labels;
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    TCGTemp *temps; /* globals first, temps after */
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    int nb_globals;
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    int nb_temps;
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    /* index of free temps, -1 if none */
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    int first_free_temp[TCG_TYPE_COUNT * 2]; 
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    /* goto_tb support */
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    uint8_t *code_buf;
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    unsigned long *tb_next;
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    uint16_t *tb_next_offset;
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    uint16_t *tb_jmp_offset; /* != NULL if USE_DIRECT_JUMP */
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    /* liveness analysis */
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    uint16_t *op_dead_iargs; /* for each operation, each bit tells if the
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                                corresponding input argument is dead */
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    /* tells in which temporary a given register is. It does not take
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       into account fixed registers */
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    int reg_to_temp[TCG_TARGET_NB_REGS];
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    TCGRegSet reserved_regs;
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    tcg_target_long current_frame_offset;
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    tcg_target_long frame_start;
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    tcg_target_long frame_end;
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    int frame_reg;
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    uint8_t *code_ptr;
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    TCGTemp static_temps[TCG_MAX_TEMPS];
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    TCGHelperInfo *helpers;
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    int nb_helpers;
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    int allocated_helpers;
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    int helpers_sorted;
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#ifdef CONFIG_PROFILER
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    /* profiling info */
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    int64_t tb_count1;
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    int64_t tb_count;
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    int64_t op_count; /* total insn count */
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    int op_count_max; /* max insn per TB */
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    int64_t temp_count;
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    int temp_count_max;
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    int64_t del_op_count;
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    int64_t code_in_len;
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    int64_t code_out_len;
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    int64_t interm_time;
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    int64_t code_time;
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    int64_t la_time;
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    int64_t restore_count;
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    int64_t restore_time;
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#endif
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};
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extern TCGContext tcg_ctx;
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extern uint16_t *gen_opc_ptr;
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extern TCGArg *gen_opparam_ptr;
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extern uint16_t gen_opc_buf[];
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extern TCGArg gen_opparam_buf[];
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/* pool based memory allocation */
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void *tcg_malloc_internal(TCGContext *s, int size);
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void tcg_pool_reset(TCGContext *s);
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void tcg_pool_delete(TCGContext *s);
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static inline void *tcg_malloc(int size)
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{
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    TCGContext *s = &tcg_ctx;
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    uint8_t *ptr, *ptr_end;
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    size = (size + sizeof(long) - 1) & ~(sizeof(long) - 1);
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    ptr = s->pool_cur;
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    ptr_end = ptr + size;
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    if (unlikely(ptr_end > s->pool_end)) {
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        return tcg_malloc_internal(&tcg_ctx, size);
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    } else {
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        s->pool_cur = ptr_end;
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        return ptr;
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    }
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}
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void tcg_context_init(TCGContext *s);
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void tcg_prologue_init(TCGContext *s);
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void tcg_func_start(TCGContext *s);
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int tcg_gen_code(TCGContext *s, uint8_t *gen_code_buf);
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int tcg_gen_code_search_pc(TCGContext *s, uint8_t *gen_code_buf, long offset);
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void tcg_set_frame(TCGContext *s, int reg,
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                   tcg_target_long start, tcg_target_long size);
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TCGv_i32 tcg_global_reg_new_i32(int reg, const char *name);
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TCGv_i32 tcg_global_mem_new_i32(int reg, tcg_target_long offset,
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                                const char *name);
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TCGv_i32 tcg_temp_new_internal_i32(int temp_local);
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static inline TCGv_i32 tcg_temp_new_i32(void)
370
{
371
    return tcg_temp_new_internal_i32(0);
372
}
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static inline TCGv_i32 tcg_temp_local_new_i32(void)
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{
375
    return tcg_temp_new_internal_i32(1);
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}
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void tcg_temp_free_i32(TCGv_i32 arg);
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char *tcg_get_arg_str_i32(TCGContext *s, char *buf, int buf_size, TCGv_i32 arg);
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TCGv_i64 tcg_global_reg_new_i64(int reg, const char *name);
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TCGv_i64 tcg_global_mem_new_i64(int reg, tcg_target_long offset,
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                                const char *name);
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TCGv_i64 tcg_temp_new_internal_i64(int temp_local);
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static inline TCGv_i64 tcg_temp_new_i64(void)
385
{
386
    return tcg_temp_new_internal_i64(0);
387
}
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static inline TCGv_i64 tcg_temp_local_new_i64(void)
389
{
390
    return tcg_temp_new_internal_i64(1);
391
}
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void tcg_temp_free_i64(TCGv_i64 arg);
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char *tcg_get_arg_str_i64(TCGContext *s, char *buf, int buf_size, TCGv_i64 arg);
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void tcg_dump_info(FILE *f, fprintf_function cpu_fprintf);
396

    
397
#define TCG_CT_ALIAS  0x80
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#define TCG_CT_IALIAS 0x40
399
#define TCG_CT_REG    0x01
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#define TCG_CT_CONST  0x02 /* any constant of register size */
401

    
402
typedef struct TCGArgConstraint {
403
    uint16_t ct;
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    uint8_t alias_index;
405
    union {
406
        TCGRegSet regs;
407
    } u;
408
} TCGArgConstraint;
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#define TCG_MAX_OP_ARGS 16
411

    
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#define TCG_OPF_BB_END     0x01 /* instruction defines the end of a basic
413
                                   block */
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#define TCG_OPF_CALL_CLOBBER 0x02 /* instruction clobbers call registers 
415
                                   and potentially update globals. */
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#define TCG_OPF_SIDE_EFFECTS 0x04 /* instruction has side effects : it
417
                                     cannot be removed if its output
418
                                     are not used */
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420
typedef struct TCGOpDef {
421
    const char *name;
422
    uint8_t nb_oargs, nb_iargs, nb_cargs, nb_args;
423
    uint8_t flags;
424
    TCGArgConstraint *args_ct;
425
    int *sorted_args;
426
#if defined(CONFIG_DEBUG_TCG)
427
    int used;
428
#endif
429
} TCGOpDef;
430
        
431
typedef struct TCGTargetOpDef {
432
    TCGOpcode op;
433
    const char *args_ct_str[TCG_MAX_OP_ARGS];
434
} TCGTargetOpDef;
435

    
436
#define tcg_abort() \
437
do {\
438
    fprintf(stderr, "%s:%d: tcg fatal error\n", __FILE__, __LINE__);\
439
    abort();\
440
} while (0)
441

    
442
void tcg_add_target_add_op_defs(const TCGTargetOpDef *tdefs);
443

    
444
#if TCG_TARGET_REG_BITS == 32
445
#define tcg_const_ptr tcg_const_i32
446
#define tcg_add_ptr tcg_add_i32
447
#define tcg_sub_ptr tcg_sub_i32
448
#define TCGv_ptr TCGv_i32
449
#define GET_TCGV_PTR GET_TCGV_I32
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#define tcg_global_reg_new_ptr tcg_global_reg_new_i32
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#define tcg_global_mem_new_ptr tcg_global_mem_new_i32
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#define tcg_temp_new_ptr tcg_temp_new_i32
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#define tcg_temp_free_ptr tcg_temp_free_i32
454
#else
455
#define tcg_const_ptr tcg_const_i64
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#define tcg_add_ptr tcg_add_i64
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#define tcg_sub_ptr tcg_sub_i64
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#define TCGv_ptr TCGv_i64
459
#define GET_TCGV_PTR GET_TCGV_I64
460
#define tcg_global_reg_new_ptr tcg_global_reg_new_i64
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#define tcg_global_mem_new_ptr tcg_global_mem_new_i64
462
#define tcg_temp_new_ptr tcg_temp_new_i64
463
#define tcg_temp_free_ptr tcg_temp_free_i64
464
#endif
465

    
466
void tcg_gen_callN(TCGContext *s, TCGv_ptr func, unsigned int flags,
467
                   int sizemask, TCGArg ret, int nargs, TCGArg *args);
468

    
469
void tcg_gen_shifti_i64(TCGv_i64 ret, TCGv_i64 arg1,
470
                        int c, int right, int arith);
471

    
472
/* only used for debugging purposes */
473
void tcg_register_helper(void *func, const char *name);
474
const char *tcg_helper_get_name(TCGContext *s, void *func);
475
void tcg_dump_ops(TCGContext *s, FILE *outfile);
476

    
477
void dump_ops(const uint16_t *opc_buf, const TCGArg *opparam_buf);
478
TCGv_i32 tcg_const_i32(int32_t val);
479
TCGv_i64 tcg_const_i64(int64_t val);
480
TCGv_i32 tcg_const_local_i32(int32_t val);
481
TCGv_i64 tcg_const_local_i64(int64_t val);
482

    
483
extern uint8_t code_gen_prologue[];
484
#if defined(_ARCH_PPC) && !defined(_ARCH_PPC64)
485
#define tcg_qemu_tb_exec(tb_ptr) \
486
    ((long REGPARM __attribute__ ((longcall)) (*)(void *))code_gen_prologue)(tb_ptr)
487
#else
488
#define tcg_qemu_tb_exec(tb_ptr) ((long REGPARM (*)(void *))code_gen_prologue)(tb_ptr)
489
#endif