path: root/src/jit/utils.cpp

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

/*XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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XX                                                                           XX
XX                                  Utils.cpp                                XX
XX                                                                           XX
XX   Has miscellaneous utility functions                                     XX
XX                                                                           XX
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
*/

#include "jitpch.h"
#ifdef _MSC_VER
#pragma hdrstop
#endif

#include "opcode.h"

/*****************************************************************************/
// Define the string platform name based on compilation #ifdefs. This is the
// same code for all platforms, hence it is here instead of in the targetXXX.cpp
// files.

#ifdef PLATFORM_UNIX
// Should we distinguish Mac? Can we?
// Should we distinguish flavors of Unix? Can we?
const char* Target::g_tgtPlatformName = "Unix";
#else  // !PLATFORM_UNIX
const char* Target::g_tgtPlatformName = "Windows";
#endif // !PLATFORM_UNIX

/*****************************************************************************/

#define DECLARE_DATA

// clang-format off
extern
const signed char       opcodeSizes[] =
{
    #define InlineNone_size           0
    #define ShortInlineVar_size       1
    #define InlineVar_size            2
    #define ShortInlineI_size         1
    #define InlineI_size              4
    #define InlineI8_size             8
    #define ShortInlineR_size         4
    #define InlineR_size              8
    #define ShortInlineBrTarget_size  1
    #define InlineBrTarget_size       4
    #define InlineMethod_size         4
    #define InlineField_size          4
    #define InlineType_size           4
    #define InlineString_size         4
    #define InlineSig_size            4
    #define InlineRVA_size            4
    #define InlineTok_size            4
    #define InlineSwitch_size         0       // for now
    #define InlinePhi_size            0       // for now
    #define InlineVarTok_size         0       // remove

    #define OPDEF(name,string,pop,push,oprType,opcType,l,s1,s2,ctrl) oprType ## _size ,
    #include "opcode.def"
    #undef OPDEF

    #undef InlineNone_size
    #undef ShortInlineVar_size
    #undef InlineVar_size
    #undef ShortInlineI_size
    #undef InlineI_size
    #undef InlineI8_size
    #undef ShortInlineR_size
    #undef InlineR_size
    #undef ShortInlineBrTarget_size
    #undef InlineBrTarget_size
    #undef InlineMethod_size
    #undef InlineField_size
    #undef InlineType_size
    #undef InlineString_size
    #undef InlineSig_size
    #undef InlineRVA_size
    #undef InlineTok_size
    #undef InlineSwitch_size
    #undef InlinePhi_size
};
// clang-format on

const BYTE varTypeClassification[] = {
#define DEF_TP(tn, nm, jitType, verType, sz, sze, asze, st, al, tf, howUsed) tf,
#include "typelist.h"
#undef DEF_TP
};

/*****************************************************************************/
/*****************************************************************************/
#ifdef DEBUG
extern const char* const opcodeNames[] = {
#define OPDEF(name, string, pop, push, oprType, opcType, l, s1, s2, ctrl) string,
#include "opcode.def"
#undef OPDEF
};

extern const BYTE opcodeArgKinds[] = {
#define OPDEF(name, string, pop, push, oprType, opcType, l, s1, s2, ctrl) (BYTE) oprType,
#include "opcode.def"
#undef OPDEF
};
#endif

/*****************************************************************************/

const char* varTypeName(var_types vt)
{
    static const char* const varTypeNames[] = {
#define DEF_TP(tn, nm, jitType, verType, sz, sze, asze, st, al, tf, howUsed) nm,
#include "typelist.h"
#undef DEF_TP
    };

    assert((unsigned)vt < sizeof(varTypeNames) / sizeof(varTypeNames[0]));

    return varTypeNames[vt];
}

#if defined(DEBUG) || defined(LATE_DISASM)
/*****************************************************************************
 *
 *  Return the name of the given register.
 */

const char* getRegName(regNumber reg, bool isFloat)
{
    // Special-case REG_NA; it's not in the regNames array, but we might want to print it.
    if (reg == REG_NA)
    {
        return "NA";
    }
#if defined(_TARGET_X86_) && defined(LEGACY_BACKEND)
    static const char* const regNames[] = {
#define REGDEF(name, rnum, mask, sname) sname,
#include "register.h"
    };

    static const char* const floatRegNames[] = {
#define REGDEF(name, rnum, mask, sname) sname,
#include "registerxmm.h"
    };
    if (isFloat)
    {
        assert(reg < ArrLen(floatRegNames));
        return floatRegNames[reg];
    }
    else
    {
        assert(reg < ArrLen(regNames));
        return regNames[reg];
    }
#elif defined(_TARGET_ARM64_)
    static const char* const regNames[] = {
#define REGDEF(name, rnum, mask, xname, wname) xname,
#include "register.h"
    };
    assert(reg < ArrLen(regNames));
    return regNames[reg];
#else
    static const char* const regNames[] = {
#define REGDEF(name, rnum, mask, sname) sname,
#include "register.h"
    };
    assert(reg < ArrLen(regNames));
    return regNames[reg];
#endif
}

const char* getRegName(unsigned reg,
                       bool     isFloat) // this is for gcencode.cpp and disasm.cpp that dont use the regNumber type
{
    return getRegName((regNumber)reg, isFloat);
}
#endif // defined(DEBUG) || defined(LATE_DISASM)

#if defined(DEBUG)

const char* getRegNameFloat(regNumber reg, var_types type)
{
#ifdef _TARGET_ARM_
    assert(genIsValidFloatReg(reg));
    if (type == TYP_FLOAT)
        return getRegName(reg);
    else
    {
        const char* regName;

        switch (reg)
        {
            default:
                assert(!"Bad double register");
                regName = "d??";
                break;
            case REG_F0:
                regName = "d0";
                break;
            case REG_F2:
                regName = "d2";
                break;
            case REG_F4:
                regName = "d4";
                break;
            case REG_F6:
                regName = "d6";
                break;
            case REG_F8:
                regName = "d8";
                break;
            case REG_F10:
                regName = "d10";
                break;
            case REG_F12:
                regName = "d12";
                break;
            case REG_F14:
                regName = "d14";
                break;
            case REG_F16:
                regName = "d16";
                break;
            case REG_F18:
                regName = "d18";
                break;
            case REG_F20:
                regName = "d20";
                break;
            case REG_F22:
                regName = "d22";
                break;
            case REG_F24:
                regName = "d24";
                break;
            case REG_F26:
                regName = "d26";
                break;
            case REG_F28:
                regName = "d28";
                break;
            case REG_F30:
                regName = "d30";
                break;
        }
        return regName;
    }

#elif defined(_TARGET_X86_) && defined(LEGACY_BACKEND)

    static const char* regNamesFloat[] = {
#define REGDEF(name, rnum, mask, sname) sname,
#include "registerxmm.h"
    };
    assert((unsigned)reg < ArrLen(regNamesFloat));

    return regNamesFloat[reg];

#elif defined(_TARGET_ARM64_)

    static const char* regNamesFloat[] = {
#define REGDEF(name, rnum, mask, xname, wname) xname,
#include "register.h"
    };
    assert((unsigned)reg < ArrLen(regNamesFloat));

    return regNamesFloat[reg];

#else
    static const char* regNamesFloat[] = {
#define REGDEF(name, rnum, mask, sname) "x" sname,
#include "register.h"
    };
#ifdef FEATURE_AVX_SUPPORT
    static const char* regNamesYMM[] = {
#define REGDEF(name, rnum, mask, sname) "y" sname,
#include "register.h"
    };
#endif // FEATURE_AVX_SUPPORT
    assert((unsigned)reg < ArrLen(regNamesFloat));

#ifdef FEATURE_AVX_SUPPORT
    if (type == TYP_SIMD32)
    {
        return regNamesYMM[reg];
    }
#endif // FEATURE_AVX_SUPPORT

    return regNamesFloat[reg];
#endif
}

/*****************************************************************************
 *
 *  Displays a register set.
 *  TODO-ARM64-Cleanup: don't allow ip0, ip1 as part of a range.
 */

void dspRegMask(regMaskTP regMask, size_t minSiz)
{
    const char* sep = "";

    printf("[");

    bool      inRegRange = false;
    regNumber regPrev    = REG_NA;
    regNumber regHead    = REG_NA; // When we start a range, remember the first register of the range, so we don't use
                                   // range notation if the range contains just a single register.
    for (regNumber regNum = REG_INT_FIRST; regNum <= REG_INT_LAST; regNum = REG_NEXT(regNum))
    {
        regMaskTP regBit = genRegMask(regNum);

        if ((regMask & regBit) != 0)
        {
            // We have a register to display. It gets displayed now if:
            // 1. This is the first register to display of a new range of registers (possibly because
            //    no register has ever been displayed).
            // 2. This is the last register of an acceptable range (either the last integer register,
            //    or the last of a range that is displayed with range notation).
            if (!inRegRange)
            {
                // It's the first register of a potential range.
                const char* nam = getRegName(regNum);
                printf("%s%s", sep, nam);
                minSiz -= strlen(sep) + strlen(nam);

                // By default, we're not starting a potential register range.
                sep = " ";

                // What kind of separator should we use for this range (if it is indeed going to be a range)?
                CLANG_FORMAT_COMMENT_ANCHOR;

#if defined(_TARGET_AMD64_)
                // For AMD64, create ranges for int registers R8 through R15, but not the "old" registers.
                if (regNum >= REG_R8)
                {
                    regHead    = regNum;
                    inRegRange = true;
                    sep        = "-";
                }
#elif defined(_TARGET_ARM64_)
                // R17 and R28 can't be the start of a range, since the range would include TEB or FP
                if ((regNum < REG_R17) || ((REG_R19 <= regNum) && (regNum < REG_R28)))
                {
                    regHead    = regNum;
                    inRegRange = true;
                    sep        = "-";
                }
#elif defined(_TARGET_ARM_)
                if (regNum < REG_R12)
                {
                    regHead    = regNum;
                    inRegRange = true;
                    sep        = "-";
                }
#elif defined(_TARGET_X86_)
// No register ranges
#else // _TARGET_*
#error Unsupported or unset target architecture
#endif // _TARGET_*
            }

#if defined(_TARGET_ARM64_)
            // We've already printed a register. Is this the end of a range?
            else if ((regNum == REG_INT_LAST) || (regNum == REG_R17) // last register before TEB
                     || (regNum == REG_R28))                         // last register before FP
#else                                                                // _TARGET_ARM64_
            // We've already printed a register. Is this the end of a range?
            else if (regNum == REG_INT_LAST)
#endif                                                               // _TARGET_ARM64_
            {
                const char* nam = getRegName(regNum);
                printf("%s%s", sep, nam);
                minSiz -= strlen(sep) + strlen(nam);
                inRegRange = false; // No longer in the middle of a register range
                regHead    = REG_NA;
                sep        = " ";
            }
        }
        else // ((regMask & regBit) == 0)
        {
            if (inRegRange)
            {
                assert(regHead != REG_NA);
                if (regPrev != regHead)
                {
                    // Close out the previous range, if it included more than one register.
                    const char* nam = getRegName(regPrev);
                    printf("%s%s", sep, nam);
                    minSiz -= strlen(sep) + strlen(nam);
                }
                sep        = " ";
                inRegRange = false;
                regHead    = REG_NA;
            }
        }

        if (regBit > regMask)
        {
            break;
        }

        regPrev = regNum;
    }

#if CPU_HAS_BYTE_REGS
    if (regMask & RBM_BYTE_REG_FLAG)
    {
        const char* nam = "BYTE";
        printf("%s%s", sep, nam);
        minSiz -= (strlen(sep) + strlen(nam));
    }
#endif

#if !FEATURE_STACK_FP_X87
    if (strlen(sep) > 0)
    {
        // We've already printed something.
        sep = " ";
    }
    inRegRange = false;
    regPrev    = REG_NA;
    regHead    = REG_NA;
    for (regNumber regNum = REG_FP_FIRST; regNum <= REG_FP_LAST; regNum = REG_NEXT(regNum))
    {
        regMaskTP regBit = genRegMask(regNum);

        if (regMask & regBit)
        {
            if (!inRegRange || (regNum == REG_FP_LAST))
            {
                const char* nam = getRegName(regNum);
                printf("%s%s", sep, nam);
                minSiz -= strlen(sep) + strlen(nam);
                sep     = "-";
                regHead = regNum;
            }
            inRegRange = true;
        }
        else
        {
            if (inRegRange)
            {
                if (regPrev != regHead)
                {
                    const char* nam = getRegName(regPrev);
                    printf("%s%s", sep, nam);
                    minSiz -= (strlen(sep) + strlen(nam));
                }
                sep = " ";
            }
            inRegRange = false;
        }

        if (regBit > regMask)
        {
            break;
        }

        regPrev = regNum;
    }
#endif

    printf("]");

    while ((int)minSiz > 0)
    {
        printf(" ");
        minSiz--;
    }
}

//------------------------------------------------------------------------
// dumpILBytes: Helper for dumpSingleInstr() to dump hex bytes of an IL stream,
// aligning up to a minimum alignment width.
//
// Arguments:
//    codeAddr  - Pointer to IL byte stream to display.
//    codeSize  - Number of bytes of IL byte stream to display.
//    alignSize - Pad out to this many characters, if fewer than this were written.
//
void dumpILBytes(const BYTE* const codeAddr,
                 unsigned          codeSize,
                 unsigned          alignSize) // number of characters to write, for alignment
{
    for (IL_OFFSET offs = 0; offs < codeSize; ++offs)
    {
        printf(" %02x", *(codeAddr + offs));
    }

    unsigned charsWritten = 3 * codeSize;
    for (unsigned i = charsWritten; i < alignSize; i++)
    {
        printf(" ");
    }
}

//------------------------------------------------------------------------
// dumpSingleInstr: Display a single IL instruction.
//
// Arguments:
//    codeAddr  - Base pointer to a stream of IL instructions.
//    offs      - Offset from codeAddr of the IL instruction to display.
//    prefix    - Optional string to prefix the IL instruction with (if nullptr, no prefix is output).
//
// Return Value:
//    Size of the displayed IL instruction in the instruction stream, in bytes. (Add this to 'offs' to
//    get to the next instruction.)
//
unsigned dumpSingleInstr(const BYTE* const codeAddr, IL_OFFSET offs, const char* prefix)
{
    const BYTE*    opcodePtr      = codeAddr + offs;
    const BYTE*    startOpcodePtr = opcodePtr;
    const unsigned ALIGN_WIDTH    = 3 * 6; // assume 3 characters * (1 byte opcode + 4 bytes data + 1 prefix byte) for
                                           // most things

    if (prefix != nullptr)
    {
        printf("%s", prefix);
    }

    OPCODE opcode = (OPCODE)getU1LittleEndian(opcodePtr);
    opcodePtr += sizeof(__int8);

DECODE_OPCODE:

    if (opcode >= CEE_COUNT)
    {
        printf("\nIllegal opcode: %02X\n", (int)opcode);
        return (IL_OFFSET)(opcodePtr - startOpcodePtr);
    }

    /* Get the size of additional parameters */

    size_t   sz      = opcodeSizes[opcode];
    unsigned argKind = opcodeArgKinds[opcode];

    /* See what kind of an opcode we have, then */

    switch (opcode)
    {
        case CEE_PREFIX1:
            opcode = OPCODE(getU1LittleEndian(opcodePtr) + 256);
            opcodePtr += sizeof(__int8);
            goto DECODE_OPCODE;

        default:
        {
            __int64 iOp;
            double  dOp;
            int     jOp;
            DWORD   jOp2;

            switch (argKind)
            {
                case InlineNone:
                    dumpILBytes(startOpcodePtr, (unsigned)(opcodePtr - startOpcodePtr), ALIGN_WIDTH);
                    printf(" %-12s", opcodeNames[opcode]);
                    break;

                case ShortInlineVar:
                    iOp = getU1LittleEndian(opcodePtr);
                    goto INT_OP;
                case ShortInlineI:
                    iOp = getI1LittleEndian(opcodePtr);
                    goto INT_OP;
                case InlineVar:
                    iOp = getU2LittleEndian(opcodePtr);
                    goto INT_OP;
                case InlineTok:
                case InlineMethod:
                case InlineField:
                case InlineType:
                case InlineString:
                case InlineSig:
                case InlineI:
                    iOp = getI4LittleEndian(opcodePtr);
                    goto INT_OP;
                case InlineI8:
                    iOp = getU4LittleEndian(opcodePtr);
                    iOp |= (__int64)getU4LittleEndian(opcodePtr + 4) << 32;
                    goto INT_OP;

                INT_OP:
                    dumpILBytes(startOpcodePtr, (unsigned)((opcodePtr - startOpcodePtr) + sz), ALIGN_WIDTH);
                    printf(" %-12s 0x%X", opcodeNames[opcode], iOp);
                    break;

                case ShortInlineR:
                    dOp = getR4LittleEndian(opcodePtr);
                    goto FLT_OP;
                case InlineR:
                    dOp = getR8LittleEndian(opcodePtr);
                    goto FLT_OP;

                FLT_OP:
                    dumpILBytes(startOpcodePtr, (unsigned)((opcodePtr - startOpcodePtr) + sz), ALIGN_WIDTH);
                    printf(" %-12s %f", opcodeNames[opcode], dOp);
                    break;

                case ShortInlineBrTarget:
                    jOp = getI1LittleEndian(opcodePtr);
                    goto JMP_OP;
                case InlineBrTarget:
                    jOp = getI4LittleEndian(opcodePtr);
                    goto JMP_OP;

                JMP_OP:
                    dumpILBytes(startOpcodePtr, (unsigned)((opcodePtr - startOpcodePtr) + sz), ALIGN_WIDTH);
                    printf(" %-12s %d (IL_%04x)", opcodeNames[opcode], jOp, (int)(opcodePtr + sz - codeAddr) + jOp);
                    break;

                case InlineSwitch:
                    jOp2 = getU4LittleEndian(opcodePtr);
                    opcodePtr += 4;
                    opcodePtr += jOp2 * 4; // Jump over the table
                    dumpILBytes(startOpcodePtr, (unsigned)(opcodePtr - startOpcodePtr), ALIGN_WIDTH);
                    printf(" %-12s", opcodeNames[opcode]);
                    break;

                case InlinePhi:
                    jOp2 = getU1LittleEndian(opcodePtr);
                    opcodePtr += 1;
                    opcodePtr += jOp2 * 2; // Jump over the table
                    dumpILBytes(startOpcodePtr, (unsigned)(opcodePtr - startOpcodePtr), ALIGN_WIDTH);
                    printf(" %-12s", opcodeNames[opcode]);
                    break;

                default:
                    assert(!"Bad argKind");
            }

            opcodePtr += sz;
            break;
        }
    }

    printf("\n");
    return (IL_OFFSET)(opcodePtr - startOpcodePtr);
}

//------------------------------------------------------------------------
// dumpILRange: Display a range of IL instructions from an IL instruction stream.
//
// Arguments:
//    codeAddr  - Pointer to IL byte stream to display.
//    codeSize  - Number of bytes of IL byte stream to display.
//
void dumpILRange(const BYTE* const codeAddr, unsigned codeSize) // in bytes
{
    for (IL_OFFSET offs = 0; offs < codeSize;)
    {
        char prefix[100];
        sprintf(prefix, "IL_%04x ", offs);
        unsigned codeBytesDumped = dumpSingleInstr(codeAddr, offs, prefix);
        offs += codeBytesDumped;
    }
}

/*****************************************************************************
 *
 *  Display a variable set.
 */
const char* genES2str(BitVecTraits* traits, EXPSET_TP set)
{
    const int   bufSize = 17;
    static char num1[bufSize];

    static char num2[bufSize];

    static char* nump = num1;

    char* temp = nump;

    nump = (nump == num1) ? num2 : num1;

    sprintf_s(temp, bufSize, "%s", BitVecOps::ToString(traits, set));

    return temp;
}

const char* refCntWtd2str(unsigned refCntWtd)
{
    const int   bufSize = 17;
    static char num1[bufSize];

    static char num2[bufSize];

    static char* nump = num1;

    char* temp = nump;

    nump = (nump == num1) ? num2 : num1;

    unsigned valueInt  = refCntWtd / BB_UNITY_WEIGHT;
    unsigned valueFrac = refCntWtd % BB_UNITY_WEIGHT;

    if (valueFrac == 0)
    {
        sprintf_s(temp, bufSize, "%2u  ", valueInt);
    }
    else
    {
        sprintf_s(temp, bufSize, "%2u.%1u", valueInt, (valueFrac * 10 / BB_UNITY_WEIGHT));
    }

    return temp;
}

#endif // DEBUG

#if defined(DEBUG) || defined(INLINE_DATA)

//------------------------------------------------------------------------
// Contains: check if the range includes a particular method
//
// Arguments:
//    info   -- jit interface pointer
//    method -- method handle for the method of interest

bool ConfigMethodRange::Contains(ICorJitInfo* info, CORINFO_METHOD_HANDLE method)
{
    _ASSERT(m_inited == 1);

    // No ranges specified means all methods included.
    if (m_lastRange == 0)
    {
        return true;
    }

    // Check the hash. Note we can't use the cached hash here since
    // we may not be asking about the method currently being jitted.
    const unsigned hash = info->getMethodHash(method);

    for (unsigned i = 0; i < m_lastRange; i++)
    {
        if ((m_ranges[i].m_low <= hash) && (hash <= m_ranges[i].m_high))
        {
            return true;
        }
    }

    return false;
}

//------------------------------------------------------------------------
// InitRanges: parse the range string and set up the range info
//
// Arguments:
//    rangeStr -- string to parse (may be nullptr)
//    capacity -- number ranges to allocate in the range array
//
// Notes:
//    Does some internal error checking; clients can use Error()
//    to determine if the range string couldn't be fully parsed
//    because of bad characters or too many entries, or had values
//    that were too large to represent.

void ConfigMethodRange::InitRanges(const wchar_t* rangeStr, unsigned capacity)
{
    // Make sure that the memory was zero initialized
    assert(m_inited == 0 || m_inited == 1);
    assert(m_entries == 0);
    assert(m_ranges == nullptr);
    assert(m_lastRange == 0);

    // Flag any crazy-looking requests
    assert(capacity < 100000);

    if (rangeStr == nullptr)
    {
        m_inited = 1;
        return;
    }

    // Allocate some persistent memory
    ICorJitHost* jitHost = JitHost::getJitHost();
    m_ranges             = (Range*)jitHost->allocateMemory(capacity * sizeof(Range));
    m_entries            = capacity;

    const wchar_t* p           = rangeStr;
    unsigned       lastRange   = 0;
    bool           setHighPart = false;

    while ((*p != 0) && (lastRange < m_entries))
    {
        while (*p == L' ')
        {
            p++;
        }

        int i = 0;

        while (L'0' <= *p && *p <= L'9')
        {
            int j = 10 * i + ((*p++) - L'0');

            // Check for overflow
            if ((m_badChar != 0) && (j <= i))
            {
                m_badChar = (p - rangeStr) + 1;
            }

            i = j;
        }

        // Was this the high part of a low-high pair?
        if (setHighPart)
        {
            // Yep, set it and move to the next range
            m_ranges[lastRange].m_high = i;

            // Sanity check that range is proper
            if ((m_badChar != 0) && (m_ranges[lastRange].m_high < m_ranges[lastRange].m_low))
            {
                m_badChar = (p - rangeStr) + 1;
            }

            lastRange++;
            setHighPart = false;
            continue;
        }

        // Must have been looking for the low part of a range
        m_ranges[lastRange].m_low = i;

        while (*p == L' ')
        {
            p++;
        }

        // Was that the low part of a low-high pair?
        if (*p == L'-')
        {
            // Yep, skip the dash and set high part next time around.
            p++;
            setHighPart = true;
            continue;
        }

        // Else we have a point range, so set high = low
        m_ranges[lastRange].m_high = i;
        lastRange++;
    }

    // If we didn't parse the full range string, note index of the the
    // first bad char.
    if ((m_badChar != 0) && (*p != 0))
    {
        m_badChar = (p - rangeStr) + 1;
    }

    // Finish off any remaining open range
    if (setHighPart)
    {
        m_ranges[lastRange].m_high = UINT_MAX;
        lastRange++;
    }

    assert(lastRange <= m_entries);
    m_lastRange = lastRange;
    m_inited    = 1;
}

#endif // defined(DEBUG) || defined(INLINE_DATA)

#if CALL_ARG_STATS || COUNT_BASIC_BLOCKS || COUNT_LOOPS || EMITTER_STATS || MEASURE_NODE_SIZE || MEASURE_MEM_ALLOC

/*****************************************************************************
 *  Histogram class.
 */

Histogram::Histogram(IAllocator* allocator, const unsigned* const sizeTable)
    : m_allocator(allocator), m_sizeTable(sizeTable), m_counts(nullptr)
{
    unsigned sizeCount = 0;
    do
    {
        sizeCount++;
    } while ((sizeTable[sizeCount] != 0) && (sizeCount < 1000));

    m_sizeCount = sizeCount;
}

Histogram::~Histogram()
{
    if (m_counts != nullptr)
    {
        m_allocator->Free(m_counts);
    }
}

// We need to lazy allocate the histogram data so static `Histogram` variables don't try to
// call the host memory allocator in the loader lock, which doesn't work.
void Histogram::ensureAllocated()
{
    if (m_counts == nullptr)
    {
        m_counts = new (m_allocator) unsigned[m_sizeCount + 1];
        memset(m_counts, 0, (m_sizeCount + 1) * sizeof(*m_counts));
    }
}

void Histogram::dump(FILE* output)
{
    ensureAllocated();

    unsigned t = 0;
    for (unsigned i = 0; i < m_sizeCount; i++)
    {
        t += m_counts[i];
    }

    for (unsigned c = 0, i = 0; i <= m_sizeCount; i++)
    {
        if (i == m_sizeCount)
        {
            if (m_counts[i] == 0)
            {
                break;
            }

            fprintf(output, "      >    %7u", m_sizeTable[i - 1]);
        }
        else
        {
            if (i == 0)
            {
                fprintf(output, "     <=    ");
            }
            else
            {
                fprintf(output, "%7u .. ", m_sizeTable[i - 1] + 1);
            }

            fprintf(output, "%7u", m_sizeTable[i]);
        }

        c += m_counts[i];

        fprintf(output, " ===> %7u count (%3u%% of total)\n", m_counts[i], (int)(100.0 * c / t));
    }
}

void Histogram::record(unsigned size)
{
    ensureAllocated();

    unsigned i;
    for (i = 0; i < m_sizeCount; i++)
    {
        if (m_sizeTable[i] >= size)
        {
            break;
        }
    }

    m_counts[i]++;
}

#endif // CALL_ARG_STATS || COUNT_BASIC_BLOCKS || COUNT_LOOPS || EMITTER_STATS || MEASURE_NODE_SIZE

/*****************************************************************************
 * Fixed bit vector class
 */

// bitChunkSize() - Returns number of bits in a bitVect chunk
inline UINT FixedBitVect::bitChunkSize()
{
    return sizeof(UINT) * 8;
}

// bitNumToBit() - Returns a bit mask of the given bit number
inline UINT FixedBitVect::bitNumToBit(UINT bitNum)
{
    assert(bitNum < bitChunkSize());
    assert(bitChunkSize() <= sizeof(int) * 8);

    return 1 << bitNum;
}

// bitVectInit() - Initializes a bit vector of a given size
FixedBitVect* FixedBitVect::bitVectInit(UINT size, Compiler* comp)
{
    UINT          bitVectMemSize, numberOfChunks;
    FixedBitVect* bv;

    assert(size != 0);

    numberOfChunks = (size - 1) / bitChunkSize() + 1;
    bitVectMemSize = numberOfChunks * (bitChunkSize() / 8); // size in bytes

    assert(bitVectMemSize * bitChunkSize() >= size);

    bv = (FixedBitVect*)comp->compGetMemA(sizeof(FixedBitVect) + bitVectMemSize, CMK_FixedBitVect);
    memset(bv->bitVect, 0, bitVectMemSize);

    bv->bitVectSize = size;

    return bv;
}

// bitVectSet() - Sets the given bit
void FixedBitVect::bitVectSet(UINT bitNum)
{
    UINT index;

    assert(bitNum <= bitVectSize);

    index = bitNum / bitChunkSize();
    bitNum -= index * bitChunkSize();

    bitVect[index] |= bitNumToBit(bitNum);
}

// bitVectTest() - Tests the given bit
bool FixedBitVect::bitVectTest(UINT bitNum)
{
    UINT index;

    assert(bitNum <= bitVectSize);

    index = bitNum / bitChunkSize();
    bitNum -= index * bitChunkSize();

    return (bitVect[index] & bitNumToBit(bitNum)) != 0;
}

// bitVectOr() - Or in the given bit vector
void FixedBitVect::bitVectOr(FixedBitVect* bv)
{
    UINT bitChunkCnt = (bitVectSize - 1) / bitChunkSize() + 1;

    assert(bitVectSize == bv->bitVectSize);

    // Or each chunks
    for (UINT i = 0; i < bitChunkCnt; i++)
    {
        bitVect[i] |= bv->bitVect[i];
    }
}

// bitVectAnd() - And with passed in bit vector
void FixedBitVect::bitVectAnd(FixedBitVect& bv)
{
    UINT bitChunkCnt = (bitVectSize - 1) / bitChunkSize() + 1;

    assert(bitVectSize == bv.bitVectSize);

    // And each chunks
    for (UINT i = 0; i < bitChunkCnt; i++)
    {
        bitVect[i] &= bv.bitVect[i];
    }
}

// bitVectGetFirst() - Find the first bit on and return bit num,
//                    Return -1 if no bits found.
UINT FixedBitVect::bitVectGetFirst()
{
    return bitVectGetNext((UINT)-1);
}

// bitVectGetNext() - Find the next bit on given previous position and return bit num.
//                    Return -1 if no bits found.
UINT FixedBitVect::bitVectGetNext(UINT bitNumPrev)
{
    UINT bitNum = (UINT)-1;
    UINT index;
    UINT bitMask;
    UINT bitChunkCnt = (bitVectSize - 1) / bitChunkSize() + 1;
    UINT i;

    if (bitNumPrev == (UINT)-1)
    {
        index   = 0;
        bitMask = (UINT)-1;
    }
    else
    {
        UINT bit;

        index = bitNumPrev / bitChunkSize();
        bitNumPrev -= index * bitChunkSize();
        bit     = bitNumToBit(bitNumPrev);
        bitMask = ~(bit | (bit - 1));
    }

    // Find first bit
    for (i = index; i < bitChunkCnt; i++)
    {
        UINT bitChunk = bitVect[i] & bitMask;

        if (bitChunk != 0)
        {
            BitScanForward((ULONG*)&bitNum, bitChunk);
            break;
        }

        bitMask = 0xFFFFFFFF;
    }

    // Empty bit vector?
    if (bitNum == (UINT)-1)
    {
        return (UINT)-1;
    }

    bitNum += i * bitChunkSize();

    assert(bitNum <= bitVectSize);

    return bitNum;
}

// bitVectGetNextAndClear() - Find the first bit on, clear it and return it.
//                            Return -1 if no bits found.
UINT FixedBitVect::bitVectGetNextAndClear()
{
    UINT bitNum      = (UINT)-1;
    UINT bitChunkCnt = (bitVectSize - 1) / bitChunkSize() + 1;
    UINT i;

    // Find first bit
    for (i = 0; i < bitChunkCnt; i++)
    {
        if (bitVect[i] != 0)
        {
            BitScanForward((ULONG*)&bitNum, bitVect[i]);
            break;
        }
    }

    // Empty bit vector?
    if (bitNum == (UINT)-1)
    {
        return (UINT)-1;
    }

    // Clear the bit in the right chunk
    bitVect[i] &= ~bitNumToBit(bitNum);

    bitNum += i * bitChunkSize();

    assert(bitNum <= bitVectSize);

    return bitNum;
}

int SimpleSprintf_s(__in_ecount(cbBufSize - (pWriteStart - pBufStart)) char* pWriteStart,
                    __in_ecount(cbBufSize) char*                             pBufStart,
                    size_t                                                   cbBufSize,
                    __in_z const char*                                       fmt,
                    ...)
{
    assert(fmt);
    assert(pBufStart);
    assert(pWriteStart);
    assert((size_t)pBufStart <= (size_t)pWriteStart);
    int ret;

    // compute the space left in the buffer.
    if ((pBufStart + cbBufSize) < pWriteStart)
    {
        NO_WAY("pWriteStart is past end of buffer");
    }
    size_t  cbSpaceLeft = (size_t)((pBufStart + cbBufSize) - pWriteStart);
    va_list args;
    va_start(args, fmt);
    ret = vsprintf_s(pWriteStart, cbSpaceLeft, const_cast<char*>(fmt), args);
    va_end(args);
    if (ret < 0)
    {
        NO_WAY("vsprintf_s failed.");
    }
    return ret;
}

#ifdef DEBUG

void hexDump(FILE* dmpf, const char* name, BYTE* addr, size_t size)
{
    if (!size)
    {
        return;
    }

    assert(addr);

    fprintf(dmpf, "Hex dump of %s:\n", name);

    for (unsigned i = 0; i < size; i++)
    {
        if ((i % 16) == 0)
        {
            fprintf(dmpf, "\n    %04X: ", i);
        }

        fprintf(dmpf, "%02X ", *addr++);
    }

    fprintf(dmpf, "\n\n");
}

#endif // DEBUG

void HelperCallProperties::init()
{
    for (CorInfoHelpFunc helper = CORINFO_HELP_UNDEF; // initialize helper
         (helper < CORINFO_HELP_COUNT);               // test helper for loop exit
         helper = CorInfoHelpFunc(int(helper) + 1))   // update helper to next
    {
        // Generally you want initialize these to their most typical/safest result
        //
        bool isPure        = false; // true if the result only depends upon input args and not any global state
        bool noThrow       = false; // true if the helper will never throw
        bool nonNullReturn = false; // true if the result will never be null or zero
        bool isAllocator   = false; // true if the result is usually a newly created heap item, or may throw OutOfMemory
        bool mutatesHeap   = false; // true if any previous heap objects [are|can be] modified
        bool mayRunCctor   = false; // true if the helper call may cause a static constructor to be run.
        bool mayFinalize   = false; // true if the helper call allocates an object that may need to run a finalizer

        switch (helper)
        {
            // Arithmetic helpers that cannot throw
            case CORINFO_HELP_LLSH:
            case CORINFO_HELP_LRSH:
            case CORINFO_HELP_LRSZ:
            case CORINFO_HELP_LMUL:
            case CORINFO_HELP_LNG2DBL:
            case CORINFO_HELP_ULNG2DBL:
            case CORINFO_HELP_DBL2INT:
            case CORINFO_HELP_DBL2LNG:
            case CORINFO_HELP_DBL2UINT:
            case CORINFO_HELP_DBL2ULNG:
            case CORINFO_HELP_FLTREM:
            case CORINFO_HELP_DBLREM:
            case CORINFO_HELP_FLTROUND:
            case CORINFO_HELP_DBLROUND:

                isPure  = true;
                noThrow = true;
                break;

            // Arithmetic helpers that *can* throw.

            // This (or these) are not pure, in that they have "VM side effects"...but they don't mutate the heap.
            case CORINFO_HELP_ENDCATCH:
                break;

            // Arithmetic helpers that may throw
            case CORINFO_HELP_LMOD: // Mods throw div-by zero, and signed mods have problems with the smallest integer
                                    // mod -1,
            case CORINFO_HELP_MOD:  // which is not representable as a positive integer.
            case CORINFO_HELP_UMOD:
            case CORINFO_HELP_ULMOD:

            case CORINFO_HELP_UDIV: // Divs throw divide-by-zero.
            case CORINFO_HELP_DIV:
            case CORINFO_HELP_LDIV:
            case CORINFO_HELP_ULDIV:

            case CORINFO_HELP_LMUL_OVF:
            case CORINFO_HELP_ULMUL_OVF:
            case CORINFO_HELP_DBL2INT_OVF:
            case CORINFO_HELP_DBL2LNG_OVF:
            case CORINFO_HELP_DBL2UINT_OVF:
            case CORINFO_HELP_DBL2ULNG_OVF:

                isPure = true;
                break;

            // Heap Allocation helpers, these all never return null
            case CORINFO_HELP_NEWSFAST:
            case CORINFO_HELP_NEWSFAST_ALIGN8:

                isAllocator   = true;
                nonNullReturn = true;
                noThrow       = true; // only can throw OutOfMemory
                break;

            case CORINFO_HELP_NEW_CROSSCONTEXT:
            case CORINFO_HELP_NEWFAST:
            case CORINFO_HELP_READYTORUN_NEW:

                mayFinalize   = true; // These may run a finalizer
                isAllocator   = true;
                nonNullReturn = true;
                noThrow       = true; // only can throw OutOfMemory
                break;

            // These allocation helpers do some checks on the size (and lower bound) inputs,
            // and can throw exceptions other than OOM.
            case CORINFO_HELP_NEWARR_1_VC:
            case CORINFO_HELP_NEWARR_1_ALIGN8:

                isAllocator   = true;
                nonNullReturn = true;
                break;

            // These allocation helpers do some checks on the size (and lower bound) inputs,
            // and can throw exceptions other than OOM.
            case CORINFO_HELP_NEW_MDARR:
            case CORINFO_HELP_NEWARR_1_DIRECT:
            case CORINFO_HELP_NEWARR_1_OBJ:
            case CORINFO_HELP_READYTORUN_NEWARR_1:

                mayFinalize   = true; // These may run a finalizer
                isAllocator   = true;
                nonNullReturn = true;
                break;

            // Heap Allocation helpers that are also pure
            case CORINFO_HELP_STRCNS:

                isPure        = true;
                isAllocator   = true;
                nonNullReturn = true;
                noThrow       = true; // only can throw OutOfMemory
                break;

            case CORINFO_HELP_BOX:
                nonNullReturn = true;
                isAllocator   = true;
                noThrow       = true; // only can throw OutOfMemory
                break;

            case CORINFO_HELP_BOX_NULLABLE:
                // Box Nullable is not a 'pure' function
                // It has a Byref argument that it reads the contents of.
                //
                // So two calls to Box Nullable that pass the same address (with the same Value Number)
                // will produce different results when the contents of the memory pointed to by the Byref changes
                //
                isAllocator = true;
                noThrow     = true; // only can throw OutOfMemory
                break;

            case CORINFO_HELP_RUNTIMEHANDLE_METHOD:
            case CORINFO_HELP_RUNTIMEHANDLE_CLASS:
            case CORINFO_HELP_RUNTIMEHANDLE_METHOD_LOG:
            case CORINFO_HELP_RUNTIMEHANDLE_CLASS_LOG:
                // logging helpers are not technically pure but can be optimized away
                isPure        = true;
                noThrow       = true;
                nonNullReturn = true;
                break;

            // type casting helpers
            case CORINFO_HELP_ISINSTANCEOFINTERFACE:
            case CORINFO_HELP_ISINSTANCEOFARRAY:
            case CORINFO_HELP_ISINSTANCEOFCLASS:
            case CORINFO_HELP_ISINSTANCEOFANY:
            case CORINFO_HELP_READYTORUN_ISINSTANCEOF:

                isPure  = true;
                noThrow = true; // These return null for a failing cast
                break;

            // type casting helpers that throw
            case CORINFO_HELP_CHKCASTINTERFACE:
            case CORINFO_HELP_CHKCASTARRAY:
            case CORINFO_HELP_CHKCASTCLASS:
            case CORINFO_HELP_CHKCASTANY:
            case CORINFO_HELP_CHKCASTCLASS_SPECIAL:
            case CORINFO_HELP_READYTORUN_CHKCAST:

                // These throw for a failing cast
                // But if given a null input arg will return null
                isPure = true;
                break;

            // helpers returning addresses, these can also throw
            case CORINFO_HELP_UNBOX:
            case CORINFO_HELP_GETREFANY:
            case CORINFO_HELP_LDELEMA_REF:

                isPure = true;
                break;

            // helpers that return internal handle
            // TODO-ARM64-Bug?: Can these throw or not?
            case CORINFO_HELP_GETCLASSFROMMETHODPARAM:
            case CORINFO_HELP_GETSYNCFROMCLASSHANDLE:

                isPure = true;
                break;

            // Helpers that load the base address for static variables.
            // We divide these between those that may and may not invoke
            // static class constructors.
            case CORINFO_HELP_GETSHARED_GCSTATIC_BASE:
            case CORINFO_HELP_GETSHARED_NONGCSTATIC_BASE:
            case CORINFO_HELP_GETSHARED_GCSTATIC_BASE_DYNAMICCLASS:
            case CORINFO_HELP_GETSHARED_NONGCSTATIC_BASE_DYNAMICCLASS:
            case CORINFO_HELP_GETGENERICS_GCTHREADSTATIC_BASE:
            case CORINFO_HELP_GETGENERICS_NONGCTHREADSTATIC_BASE:
            case CORINFO_HELP_GETSHARED_GCTHREADSTATIC_BASE:
            case CORINFO_HELP_GETSHARED_NONGCTHREADSTATIC_BASE:
            case CORINFO_HELP_CLASSINIT_SHARED_DYNAMICCLASS:
            case CORINFO_HELP_GETSHARED_GCTHREADSTATIC_BASE_DYNAMICCLASS:
            case CORINFO_HELP_GETSHARED_NONGCTHREADSTATIC_BASE_DYNAMICCLASS:
            case CORINFO_HELP_GETSTATICFIELDADDR_CONTEXT:
            case CORINFO_HELP_GETSTATICFIELDADDR_TLS:
            case CORINFO_HELP_GETGENERICS_GCSTATIC_BASE:
            case CORINFO_HELP_GETGENERICS_NONGCSTATIC_BASE:
            case CORINFO_HELP_READYTORUN_STATIC_BASE:
#if COR_JIT_EE_VERSION > 460
            case CORINFO_HELP_READYTORUN_GENERIC_STATIC_BASE:
#endif // COR_JIT_EE_VERSION > 460

                // These may invoke static class constructors
                // These can throw InvalidProgram exception if the class can not be constructed
                //
                isPure        = true;
                nonNullReturn = true;
                mayRunCctor   = true;
                break;

            case CORINFO_HELP_GETSHARED_GCSTATIC_BASE_NOCTOR:
            case CORINFO_HELP_GETSHARED_NONGCSTATIC_BASE_NOCTOR:
            case CORINFO_HELP_GETSHARED_GCTHREADSTATIC_BASE_NOCTOR:
            case CORINFO_HELP_GETSHARED_NONGCTHREADSTATIC_BASE_NOCTOR:

                // These do not invoke static class constructors
                //
                isPure        = true;
                noThrow       = true;
                nonNullReturn = true;
                break;

            // GC Write barrier support
            // TODO-ARM64-Bug?: Can these throw or not?
            case CORINFO_HELP_ASSIGN_REF:
            case CORINFO_HELP_CHECKED_ASSIGN_REF:
            case CORINFO_HELP_ASSIGN_REF_ENSURE_NONHEAP:
            case CORINFO_HELP_ASSIGN_BYREF:
            case CORINFO_HELP_ASSIGN_STRUCT:

                mutatesHeap = true;
                break;

            // Accessing fields (write)
            case CORINFO_HELP_SETFIELD32:
            case CORINFO_HELP_SETFIELD64:
            case CORINFO_HELP_SETFIELDOBJ:
            case CORINFO_HELP_SETFIELDSTRUCT:
            case CORINFO_HELP_SETFIELDFLOAT:
            case CORINFO_HELP_SETFIELDDOUBLE:
            case CORINFO_HELP_ARRADDR_ST:

                mutatesHeap = true;
                break;

            // These helper calls always throw an exception
            case CORINFO_HELP_OVERFLOW:
            case CORINFO_HELP_VERIFICATION:
            case CORINFO_HELP_RNGCHKFAIL:
            case CORINFO_HELP_THROWDIVZERO:
#if COR_JIT_EE_VERSION > 460
            case CORINFO_HELP_THROWNULLREF:
#endif // COR_JIT_EE_VERSION
            case CORINFO_HELP_THROW:
            case CORINFO_HELP_RETHROW:

                break;

            // These helper calls may throw an exception
            case CORINFO_HELP_METHOD_ACCESS_CHECK:
            case CORINFO_HELP_FIELD_ACCESS_CHECK:
            case CORINFO_HELP_CLASS_ACCESS_CHECK:
            case CORINFO_HELP_DELEGATE_SECURITY_CHECK:

                break;

            // This is a debugging aid; it simply returns a constant address.
            case CORINFO_HELP_LOOP_CLONE_CHOICE_ADDR:
                isPure  = true;
                noThrow = true;
                break;

            // Not sure how to handle optimization involving the rest of these  helpers
            default:

                // The most pessimistic results are returned for these helpers
                mutatesHeap = true;
                break;
        }

        m_isPure[helper]        = isPure;
        m_noThrow[helper]       = noThrow;
        m_nonNullReturn[helper] = nonNullReturn;
        m_isAllocator[helper]   = isAllocator;
        m_mutatesHeap[helper]   = mutatesHeap;
        m_mayRunCctor[helper]   = mayRunCctor;
        m_mayFinalize[helper]   = mayFinalize;
    }
}

//=============================================================================
// AssemblyNamesList2
//=============================================================================
// The string should be of the form
// MyAssembly
// MyAssembly;mscorlib;System
// MyAssembly;mscorlib System

AssemblyNamesList2::AssemblyNamesList2(const wchar_t* list, IAllocator* alloc) : m_alloc(alloc)
{
    assert(m_alloc != nullptr);

    WCHAR          prevChar   = '?';     // dummy
    LPWSTR         nameStart  = nullptr; // start of the name currently being processed. nullptr if no current name
    AssemblyName** ppPrevLink = &m_pNames;

    for (LPWSTR listWalk = const_cast<LPWSTR>(list); prevChar != '\0'; prevChar = *listWalk, listWalk++)
    {
        WCHAR curChar = *listWalk;

        if (iswspace(curChar) || curChar == W(';') || curChar == W('\0'))
        {
            //
            // Found white-space
            //

            if (nameStart)
            {
                // Found the end of the current name; add a new assembly name to the list.

                AssemblyName* newName = new (m_alloc) AssemblyName();

                // Null out the current character so we can do zero-terminated string work; we'll restore it later.
                *listWalk = W('\0');

                // How much space do we need?
                int convertedNameLenBytes =
                    WszWideCharToMultiByte(CP_UTF8, 0, nameStart, -1, nullptr, 0, nullptr, nullptr);
                newName->m_assemblyName = new (m_alloc) char[convertedNameLenBytes]; // convertedNameLenBytes includes
                                                                                     // the trailing null character
                if (WszWideCharToMultiByte(CP_UTF8, 0, nameStart, -1, newName->m_assemblyName, convertedNameLenBytes,
                                           nullptr, nullptr) != 0)
                {
                    *ppPrevLink = newName;
                    ppPrevLink  = &newName->m_next;
                }
                else
                {
                    // Failed to convert the string. Ignore this string (and leak the memory).
                }

                nameStart = nullptr;

                // Restore the current character.
                *listWalk = curChar;
            }
        }
        else if (!nameStart)
        {
            //
            // Found the start of a new name
            //

            nameStart = listWalk;
        }
    }

    assert(nameStart == nullptr); // cannot be in the middle of a name
    *ppPrevLink = nullptr;        // Terminate the last element of the list.
}

AssemblyNamesList2::~AssemblyNamesList2()
{
    for (AssemblyName* pName = m_pNames; pName != nullptr; /**/)
    {
        AssemblyName* cur = pName;
        pName             = pName->m_next;

        m_alloc->Free(cur->m_assemblyName);
        m_alloc->Free(cur);
    }
}

bool AssemblyNamesList2::IsInList(const char* assemblyName)
{
    for (AssemblyName* pName = m_pNames; pName != nullptr; pName = pName->m_next)
    {
        if (_stricmp(pName->m_assemblyName, assemblyName) == 0)
        {
            return true;
        }
    }

    return false;
}

#ifdef FEATURE_JIT_METHOD_PERF
CycleCount::CycleCount() : cps(CycleTimer::CyclesPerSecond())
{
}

bool CycleCount::GetCycles(unsigned __int64* time)
{
    return CycleTimer::GetThreadCyclesS(time);
}

bool CycleCount::Start()
{
    return GetCycles(&beginCycles);
}

double CycleCount::ElapsedTime()
{
    unsigned __int64 nowCycles;
    (void)GetCycles(&nowCycles);
    return ((double)(nowCycles - beginCycles) / cps) * 1000.0;
}

bool PerfCounter::Start()
{
    bool result = QueryPerformanceFrequency(&beg) != 0;
    if (!result)
    {
        return result;
    }
    freq = (double)beg.QuadPart / 1000.0;
    (void)QueryPerformanceCounter(&beg);
    return result;
}

// Return elapsed time from Start() in millis.
double PerfCounter::ElapsedTime()
{
    LARGE_INTEGER li;
    (void)QueryPerformanceCounter(&li);
    return (double)(li.QuadPart - beg.QuadPart) / freq;
}

#endif

#ifdef DEBUG

/*****************************************************************************
 * Return the number of digits in a number of the given base (default base 10).
 * Used when outputting strings.
 */
unsigned CountDigits(unsigned num, unsigned base /* = 10 */)
{
    assert(2 <= base && base <= 16); // sanity check
    unsigned count = 1;
    while (num >= base)
    {
        num /= base;
        ++count;
    }
    return count;
}

#endif // DEBUG

double FloatingPointUtils::convertUInt64ToDouble(unsigned __int64 uIntVal)
{
    __int64 s64 = uIntVal;
    double  d;
    if (s64 < 0)
    {
#if defined(_TARGET_XARCH_)
        // RyuJIT codegen and clang (or gcc) may produce different results for casting uint64 to
        // double, and the clang result is more accurate. For example,
        //    1) (double)0x84595161401484A0UL --> 43e08b2a2c280290  (RyuJIT codegen or VC++)
        //    2) (double)0x84595161401484A0UL --> 43e08b2a2c280291  (clang or gcc)
        // If the folding optimization below is implemented by simple casting of (double)uint64_val
        // and it is compiled by clang, casting result can be inconsistent, depending on whether
        // the folding optimization is triggered or the codegen generates instructions for casting. //
        // The current solution is to force the same math as the codegen does, so that casting
        // result is always consistent.

        // d = (double)(int64_t)uint64 + 0x1p64
        uint64_t adjHex = 0x43F0000000000000UL;
        d               = (double)s64 + *(double*)&adjHex;
#else
        d                             = (double)uIntVal;
#endif
    }
    else
    {
        d = (double)uIntVal;
    }
    return d;
}

float FloatingPointUtils::convertUInt64ToFloat(unsigned __int64 u64)
{
    double d = convertUInt64ToDouble(u64);
    return (float)d;
}

unsigned __int64 FloatingPointUtils::convertDoubleToUInt64(double d)
{
    unsigned __int64 u64;
    if (d >= 0.0)
    {
        // Work around a C++ issue where it doesn't properly convert large positive doubles
        const double two63 = 2147483648.0 * 4294967296.0;
        if (d < two63)
        {
            u64 = UINT64(d);
        }
        else
        {
            // subtract 0x8000000000000000, do the convert then add it back again
            u64 = INT64(d - two63) + I64(0x8000000000000000);
        }
        return u64;
    }

#ifdef _TARGET_XARCH_

    // While the Ecma spec does not specifically call this out,
    // the case of conversion from negative double to unsigned integer is
    // effectively an overflow and therefore the result is unspecified.
    // With MSVC for x86/x64, such a conversion results in the bit-equivalent
    // unsigned value of the conversion to integer. Other compilers convert
    // negative doubles to zero when the target is unsigned.
    // To make the behavior consistent across OS's on TARGET_XARCH,
    // this double cast is needed to conform MSVC behavior.

    u64 = UINT64(INT64(d));
#else
    u64                               = UINT64(d);
#endif // _TARGET_XARCH_

    return u64;
}

// Rounds a double-precision floating-point value to the nearest integer,
// and rounds midpoint values to the nearest even number.
// Note this should align with classlib in floatdouble.cpp
// Specializing for x86 using a x87 instruction is optional since
// this outcome is identical across targets.
double FloatingPointUtils::round(double x)
{
    // If the number has no fractional part do nothing
    // This shortcut is necessary to workaround precision loss in borderline cases on some platforms
    if (x == ((double)((__int64)x)))
    {
        return x;
    }

    // We had a number that was equally close to 2 integers.
    // We need to return the even one.

    double tempVal    = (x + 0.5);
    double flrTempVal = floor(tempVal);

    if ((flrTempVal == tempVal) && (fmod(tempVal, 2.0) != 0))
    {
        flrTempVal -= 1.0;
    }

    return _copysign(flrTempVal, x);
}