/*
 * libbinrec: a recompiling translator for machine code
 * Copyright (c) 2016 Andrew Church <achurch@achurch.org>
 *
 * This software may be copied and redistributed under certain conditions;
 * see the file "COPYING" in the source code distribution for details.
 * NO WARRANTY is provided with this software.
 */

#include "tests/common.h"
#include "tests/host-x86/common.h"


static const binrec_setup_t setup = {
    .host = BINREC_ARCH_X86_64_SYSV,
};
static const unsigned int host_opt = BINREC_OPT_H_X86_FIXED_REGS
                                   | BINREC_OPT_H_X86_MERGE_REGS;

static int add_rtl(RTLUnit *unit)
{
    int reg1, reg2, reg3, alias;
    EXPECT(reg1 = rtl_alloc_register(unit, RTLTYPE_ADDRESS));
    EXPECT(rtl_add_insn(unit, RTLOP_LOAD_ARG, reg1, 0, 0, 0));
    EXPECT(alias = rtl_alloc_alias_register(unit, RTLTYPE_INT32));
    rtl_set_alias_storage(unit, alias, reg1, 0x1234);
    EXPECT(reg2 = rtl_alloc_register(unit, RTLTYPE_INT32));
    EXPECT(rtl_add_insn(unit, RTLOP_LOAD_IMM, reg2, 0, 0, 2));
    /* reg3 should get ECX, but the early merge will be cancelled by the
     * fixed-regs reservation for SHL in the next block. */
    EXPECT(reg3 = rtl_alloc_register(unit, RTLTYPE_INT32));
    EXPECT(rtl_add_insn(unit, RTLOP_LOAD_IMM, reg3, 0, 0, 3));
    EXPECT(rtl_add_insn(unit, RTLOP_NOP, 0, reg2, 0, 0));
    EXPECT(rtl_add_insn(unit, RTLOP_SET_ALIAS, 0, reg3, 0, alias));

    int reg4, reg5, reg6, reg7, label;
    EXPECT(label = rtl_alloc_label(unit));
    EXPECT(rtl_add_insn(unit, RTLOP_LABEL, 0, 0, 0, label));
    /* reg4 should get ECX by fixed-regs, cancelling the early merge from
     * reg3. */
    EXPECT(reg4 = rtl_alloc_register(unit, RTLTYPE_INT32));
    EXPECT(rtl_add_insn(unit, RTLOP_LOAD_IMM, reg4, 0, 0, 4));
    EXPECT(reg5 = rtl_alloc_register(unit, RTLTYPE_INT32));
    EXPECT(rtl_add_insn(unit, RTLOP_LOAD_IMM, reg5, 0, 0, 5));
    /* If we fill up the host register file, the allocator shouldn't get
     * confused by the merge having already been cancelled. */
    int fill_regs[12];
    for (int i = 0; i < lenof(fill_regs); i++) {
        EXPECT(fill_regs[i] = rtl_alloc_register(unit, RTLTYPE_INT32));
        EXPECT(rtl_add_insn(unit, RTLOP_NOP, fill_regs[i], 0, 0, 0));
    }
    for (int i = 0; i < lenof(fill_regs); i++) {
        EXPECT(rtl_add_insn(unit, RTLOP_NOP, 0, fill_regs[i], 0, 0));
    }
    EXPECT(reg6 = rtl_alloc_register(unit, RTLTYPE_INT32));
    EXPECT(rtl_add_insn(unit, RTLOP_SLL, reg6, reg5, reg4, 0));
    /* Make sure reg5 (instead of reg4) is spilled by fill_regs. */
    EXPECT(rtl_add_insn(unit, RTLOP_NOP, 0, reg5, 0, 0));
    EXPECT(reg7 = rtl_alloc_register(unit, RTLTYPE_INT32));
    EXPECT(rtl_add_insn(unit, RTLOP_GET_ALIAS, reg7, 0, 0, alias));
    EXPECT(rtl_add_insn(unit, RTLOP_SET_ALIAS, 0, reg7, 0, alias));

    EXPECT(rtl_add_insn(unit, RTLOP_NOP, 0, reg1, 0, 0));
    return EXIT_SUCCESS;
}

static const uint8_t expected_code[] = {
    0x53,                               // push %rbx
    0x55,                               // push %rbp
    0x41,0x54,                          // push %r12
    0x41,0x55,                          // push %r13
    0x41,0x56,                          // push %r14
    0x48,0x83,0xEC,0x10,                // sub $16,%rsp
    0xB8,0x02,0x00,0x00,0x00,           // mov $2,%eax
    0xB9,0x03,0x00,0x00,0x00,           // mov $3,%ecx
    0x89,0x8F,0x34,0x12,0x00,0x00,      // mov %ecx,0x1234(%rdi)
    0xB9,0x04,0x00,0x00,0x00,           // mov $4,%ecx
    0xB8,0x05,0x00,0x00,0x00,           // mov $5,%eax
    0x89,0x04,0x24,                     // mov %eax,(%rsp)
    0x8B,0x04,0x24,                     // mov (%rsp),%eax
    0xD3,0xE0,                          // shl %cl,%eax
    0x8B,0x87,0x34,0x12,0x00,0x00,      // mov 0x1234(%rdi),%eax
    0x89,0x87,0x34,0x12,0x00,0x00,      // mov %eax,0x1234(%rdi)
    0x48,0x83,0xC4,0x10,                // add $16,%rsp
    0x41,0x5E,                          // pop %r14
    0x41,0x5D,                          // pop %r13
    0x41,0x5C,                          // pop %r12
    0x5D,                               // pop %rbp
    0x5B,                               // pop %rbx
    0xC3,                               // ret
};

static const char expected_log[] = "";

#include "tests/rtl-translate-test.i"