options.cpp

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/* src/vm/options.cpp - contains global options

   Copyright (C) 1996-2013
   CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO

   This file is part of CACAO.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.

*/


#include "config.h"

#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

#include "mm/dumpmemory.hpp"

#include "vm/options.hpp"
#include "vm/os.hpp"
#include "vm/vm.hpp"

#include "toolbox/Debug.hpp"
#include "toolbox/logging.hpp"
#include "toolbox/Option.hpp"


/* command line option ********************************************************/

s4    opt_index = 0;            /* index of processed arguments               */
char *opt_arg;                  /* this one exports the option argument       */

bool opt_foo = false;           /* option for development                     */

bool opt_jar = false;

#if defined(ENABLE_JIT)
bool opt_jit = true;            /* JIT mode execution (default)               */
bool opt_intrp = false;         /* interpreter mode execution                 */
#else
bool opt_jit = false;           /* JIT mode execution                         */
bool opt_intrp = true;          /* interpreter mode execution (default)       */
#endif

bool opt_run = true;

s4   opt_heapmaxsize   = 0;     /* maximum heap size                          */
s4   opt_heapstartsize = 0;     /* initial heap size                          */
s4   opt_stacksize     = 0;     /* thread stack size                          */

bool opt_verbose = false;
bool opt_debugcolor = false;    /* use ANSI terminal sequences            */

bool loadverbose = false;
bool initverbose = false;

bool opt_verboseclass     = false;
bool opt_verbosegc        = false;
bool opt_verbosejni       = false;
bool opt_verbosecall      = false;      /* trace all method invocation        */

bool showmethods = false;
bool showconstantpool = false;
bool showutf = false;

bool compileverbose =  false;           /* trace compiler actions             */
bool showstack = false;

bool opt_showdisassemble    = false;    /* generate disassembler listing      */
bool opt_showddatasegment   = false;    /* generate data segment listing      */
bool opt_showintermediate   = false;    /* generate intermediate code listing */

bool checkbounds = true;       /* check array bounds                         */
bool checksync = true;         /* do synchronization                         */
#if defined(ENABLE_LOOP)
bool opt_loops = false;        /* optimize array accesses in loops           */
#endif

bool makeinitializations = true;

#if defined(ENABLE_STATISTICS)
bool opt_stat    = false;
bool opt_getloadingtime = false;   /* to measure the runtime                 */
bool opt_getcompilingtime = false; /* compute compile time                   */
#endif
#if defined(ENABLE_VERIFIER)
bool opt_verify  = true;       /* true if classfiles should be verified      */
#endif

#if defined(ENABLE_PROFILING)
bool opt_prof    = false;
bool opt_prof_bb = false;
#endif

#if defined(ENABLE_OPAGENT)
bool opt_opagent = false;
#endif

/* optimization options *******************************************************/

#if defined(ENABLE_IFCONV)
bool opt_ifconv = false;
#endif

#if defined(ENABLE_LSRA) || defined(ENABLE_SSA)
bool opt_lsra = false;
#endif
#if defined(ENABLE_SSA)
bool opt_ssa_dce = false;          /* enable dead code elemination */
bool opt_ssa_cp = false;           /* enable copy propagation      */
#endif


/* interpreter options ********************************************************/

#if defined(ENABLE_INTRP)
bool opt_no_dynamic = false;            /* suppress dynamic superinstructions */
bool opt_no_replication = false;        /* don't use replication in intrp     */
bool opt_no_quicksuper = false;         /* instructions for quickening cannot be
                                           part of dynamic superinstructions */

s4   opt_static_supers = 0x7fffffff;
bool vm_debug = false;          /* XXX this should be called `opt_trace'      */
#endif

#if defined(ENABLE_DEBUG_FILTER)
const char *opt_filter_verbosecall_include = 0;
const char *opt_filter_verbosecall_exclude = 0;
const char *opt_filter_show_method = 0;
#endif


/* -XX options ****************************************************************/

/* NOTE: For better readability keep these alpha-sorted. */

/* Options which must always be available (production options in
   HotSpot). */

int64_t  opt_MaxDirectMemorySize          = -1;
int      opt_MaxPermSize                  = 0;
int      opt_PermSize                     = 0;
int      opt_ThreadStackSize              = 0;

/* Debugging options which can be turned off. */

bool     opt_AlwaysEmitLongBranches       = false;
bool     opt_AlwaysMmapFirstPage          = false;
int      opt_CompileAll                   = 0;
char*    opt_CompileMethod                = NULL;
char*    opt_CompileSignature             = NULL;
int      opt_DebugLocalReferences         = 0;
int      opt_DebugLocks                   = 0;
int      opt_DebugPackage                 = 0;
int      opt_DebugPatcher                 = 0;
int      opt_DebugProperties              = 0;
int      opt_DebugStackFrameInfo          = 0;
int      opt_DebugStackTrace              = 0;
int      opt_DebugThreads                 = 0;
#if defined(ENABLE_DISASSEMBLER)
int      opt_DisassembleStubs             = 0;
#endif
#if defined(ENABLE_OPAGENT)
int      opt_EnableOpagent                = 0;
#endif
#if defined(ENABLE_GC_CACAO)
int      opt_GCDebugRootSet               = 0;
int      opt_GCStress                     = 0;
#endif
#if defined(ENABLE_INLINING)
int      opt_Inline                       = 0;
#if defined(ENABLE_INLINING_DEBUG) || !defined(NDEBUG)
int      opt_InlineAll                    = 0;
int      opt_InlineCount                  = INT_MAX;
int      opt_InlineMaxSize                = INT_MAX;
int      opt_InlineMinSize                = 0;
char*    opt_InlineMethod                 = NULL;
Utf8String opt_InlineMethodUtf;
#endif
#endif
int      opt_PrintConfig                  = 0;
int      opt_PrintWarnings                = 0;
int      opt_ProfileGCMemoryUsage         = 0;
int      opt_ProfileMemoryUsage           = 0;
FILE    *opt_ProfileMemoryUsageGNUPlot    = NULL;
int      opt_RegallocSpillAll             = 0;
#if defined(ENABLE_REPLACEMENT)
char*    opt_ReplaceMethod                = NULL;
char*    opt_OptimizeMethod               = NULL;
bool     opt_DisableCountdownTraps        = false;
#endif
int      opt_TraceBuiltinCalls            = 0;
int      opt_TraceCompilerCalls           = 0;
int      opt_TraceExceptions              = 0;
int      opt_TraceHPI                     = 0;
#if defined(ENABLE_INLINING) && !defined(NDEBUG)
int      opt_TraceInlining                = 0;
#endif
int      opt_TraceJavaCalls               = 0;
bool     opt_TraceJMMCalls                = false;
int      opt_TraceJNICalls                = 0;
int      opt_TraceJVMCalls                = 0;
int      opt_TraceJVMCallsVerbose         = 0;
#if defined(ENABLE_RT_TIMING)
FILE    *opt_RtTimingLogfile              = NULL;
bool     opt_RtTimingCSV                  = false;
#endif
#if defined(ENABLE_STATISTICS)
FILE    *opt_StatisticsLogfile            = NULL;
bool     opt_StatisticsCSV                = false;
#endif
#if defined(ENABLE_JVMTI)
int      opt_TraceJVMTICalls              = 0;
#endif
int      opt_TraceLinkClass               = 0;
int      opt_TraceSubsystemInitialization = 0;
int      opt_TraceTraps                   = 0;


enum {
    OPT_TYPE_BOOLEAN,
    OPT_TYPE_VALUE
};

enum {
    /* Options which must always be available (production options in
       HotSpot). */

    OPT_MaxDirectMemorySize,
    OPT_MaxPermSize,
    OPT_PermSize,
    OPT_ThreadStackSize,

    /* Debugging options which can be turned off. */

    OPT_AlwaysEmitLongBranches,
    OPT_AlwaysMmapFirstPage,
    OPT_CompileAll,
    OPT_CompileMethod,
    OPT_CompileSignature,
    OPT_ColorOutput,
    OPT_DebugLocalReferences,
    OPT_DebugLocks,
    OPT_DebugPackage,
    OPT_DebugPatcher,
    OPT_DebugStackFrameInfo,
    OPT_DebugStackTrace,
    OPT_DebugThreads,
    OPT_DisassembleStubs,
    OPT_EnableOpagent,
    OPT_GCDebugRootSet,
    OPT_GCStress,
    OPT_Inline,
    OPT_InlineAll,
    OPT_InlineCount,
    OPT_InlineMaxSize,
    OPT_InlineMinSize,
    OPT_InlineMethod,
    OPT_PrintConfig,
    OPT_PrintWarnings,
    OPT_ProfileGCMemoryUsage,
    OPT_ProfileMemoryUsage,
    OPT_ProfileMemoryUsageGNUPlot,
    OPT_RegallocSpillAll,
    OPT_ReplaceMethod,
    OPT_OptimizeMethod,
    OPT_TestReplacement,
    OPT_DisableCountdownTraps,
    OPT_TraceBuiltinCalls,
    OPT_TraceCompilerCalls,
    OPT_TraceExceptions,
    OPT_TraceHPI,
    OPT_TraceInlining,
    OPT_TraceJavaCalls,
    OPT_TraceJMMCalls,
    OPT_TraceJNICalls,
    OPT_TraceJVMCalls,
    OPT_TraceJVMCallsVerbose,
    OPT_TraceJVMTICalls,
    OPT_TraceLinkClass,
    OPT_TraceSubsystemInitialization,
    OPT_TraceTraps,
    OPT_RtTimingLogfile,
    OPT_RtTimingCSV,
    OPT_StatisticsLogfile,
    OPT_StatisticsCSV
};


option_t options_XX[] = {
    /* Options which must always be available (production options in
       HotSpot). */

    { "MaxDirectMemorySize",          OPT_MaxDirectMemorySize,          OPT_TYPE_VALUE,   "Maximum total size of NIO direct-buffer allocations" },
    { "MaxPermSize",                  OPT_MaxPermSize,                  OPT_TYPE_VALUE,   "not implemented" },
    { "PermSize",                     OPT_PermSize,                     OPT_TYPE_VALUE,   "not implemented" },
    { "ThreadStackSize",              OPT_ThreadStackSize,              OPT_TYPE_VALUE,   "TODO" },

    /* Debugging options which can be turned off. */

    { "AlwaysEmitLongBranches",       OPT_AlwaysEmitLongBranches,       OPT_TYPE_BOOLEAN, "Always emit long-branches." },
    { "AlwaysMmapFirstPage",          OPT_AlwaysMmapFirstPage,          OPT_TYPE_BOOLEAN, "Always mmap memory page at address 0x0." },
    { "CompileAll",                   OPT_CompileAll,                   OPT_TYPE_BOOLEAN, "compile all methods, no execution" },
    { "CompileMethod",                OPT_CompileMethod,                OPT_TYPE_VALUE,   "compile only a specific method" },
    { "CompileSignature",             OPT_CompileSignature,             OPT_TYPE_VALUE,   "specify signature for a specific method" },
    { "DebugLocalReferences",         OPT_DebugLocalReferences,         OPT_TYPE_BOOLEAN, "print debug information for local reference tables" },
    { "DebugLocks",                   OPT_DebugLocks,                   OPT_TYPE_BOOLEAN, "print debug information for locks" },
    { "DebugPackage",                 OPT_DebugPackage,                 OPT_TYPE_BOOLEAN, "debug Java boot-packages" },
    { "DebugPatcher",                 OPT_DebugPatcher,                 OPT_TYPE_BOOLEAN, "debug JIT code patching" },
    { "DebugStackFrameInfo",          OPT_DebugStackFrameInfo,          OPT_TYPE_BOOLEAN, "TODO" },
    { "DebugStackTrace",              OPT_DebugStackTrace,              OPT_TYPE_BOOLEAN, "debug stacktrace creation" },
    { "DebugThreads",                 OPT_DebugThreads,                 OPT_TYPE_BOOLEAN, "print debug information for threads" },
    { "ColorOutput",                  OPT_ColorOutput,                  OPT_TYPE_VALUE,   "enable color output (yes, no, auto) [default=auto]" },
#if defined(ENABLE_DISASSEMBLER)
    { "DisassembleStubs",             OPT_DisassembleStubs,             OPT_TYPE_BOOLEAN, "disassemble builtin and native stubs when generated" },
#endif
#if defined(ENABLE_OPAGENT)
    { "EnableOpagent",                OPT_EnableOpagent,                OPT_TYPE_BOOLEAN, "enable providing JIT output to Oprofile" },
#endif
#if defined(ENABLE_GC_CACAO)
    { "GCDebugRootSet",               OPT_GCDebugRootSet,               OPT_TYPE_BOOLEAN, "GC: print root-set at collection" },
    { "GCStress",                     OPT_GCStress,                     OPT_TYPE_BOOLEAN, "GC: forced collection at every allocation" },
#endif
#if defined(ENABLE_INLINING)
    { "Inline",                       OPT_Inline,                       OPT_TYPE_BOOLEAN, "enable method inlining" },
#if defined(ENABLE_INLINING_DEBUG) || !defined(NDEBUG)
    { "InlineAll",                    OPT_InlineAll,                    OPT_TYPE_BOOLEAN, "use inlining in all compilations" },
    { "InlineCount",                  OPT_InlineCount,                  OPT_TYPE_VALUE,   "stop inlining after the given number of roots" },
    { "InlineMaxSize",                OPT_InlineMaxSize,                OPT_TYPE_VALUE,   "maximum size for inlined result" },
    { "InlineMinSize",                OPT_InlineMinSize,                OPT_TYPE_VALUE,   "minimum size for inlined result" },
    { "InlineMethod",                 OPT_InlineMethod,                 OPT_TYPE_VALUE,   "inline only specified method" },
#endif
#endif
    { "PrintConfig",                  OPT_PrintConfig,                  OPT_TYPE_BOOLEAN, "print VM configuration" },
    { "PrintWarnings",                OPT_PrintWarnings,                OPT_TYPE_BOOLEAN, "print warnings about suspicious behavior"},
    { "ProfileGCMemoryUsage",         OPT_ProfileGCMemoryUsage,         OPT_TYPE_VALUE,   "profiles GC memory usage in the given interval, <value> is in seconds (default: 5)" },
    { "ProfileMemoryUsage",           OPT_ProfileMemoryUsage,           OPT_TYPE_VALUE,   "TODO" },
    { "ProfileMemoryUsageGNUPlot",    OPT_ProfileMemoryUsageGNUPlot,    OPT_TYPE_VALUE,   "TODO" },
    { "RegallocSpillAll",             OPT_RegallocSpillAll,             OPT_TYPE_BOOLEAN, "spill all variables to the stack" },
#if defined(ENABLE_REPLACEMENT)
    { "ReplaceMethod",                OPT_ReplaceMethod,                OPT_TYPE_VALUE,   "perform on-stack replacement only for the specified method"},
    { "OptimizeMethod",               OPT_OptimizeMethod,               OPT_TYPE_VALUE,   ""},
    { "TestReplacement",              OPT_TestReplacement,              OPT_TYPE_BOOLEAN, "activate all replacement points during code generation" },
    { "DisableCountdownTraps",        OPT_DisableCountdownTraps,        OPT_TYPE_BOOLEAN, "" },
#endif
    { "TraceBuiltinCalls",            OPT_TraceBuiltinCalls,            OPT_TYPE_BOOLEAN, "trace calls to VM builtin functions" },
    { "TraceCompilerCalls",           OPT_TraceCompilerCalls,           OPT_TYPE_BOOLEAN, "trace JIT compiler calls" },
    { "TraceExceptions",              OPT_TraceExceptions,              OPT_TYPE_BOOLEAN, "trace Exception throwing" },
    { "TraceHPI",                     OPT_TraceHPI,                     OPT_TYPE_BOOLEAN, "Trace Host Porting Interface (HPI)" },
#if defined(ENABLE_INLINING) && !defined(NDEBUG)
    { "TraceInlining",                OPT_TraceInlining,                OPT_TYPE_VALUE,   "trace method inlining with the given verbosity level (default: 1)" },
#endif
    { "TraceJavaCalls",               OPT_TraceJavaCalls,               OPT_TYPE_BOOLEAN, "trace Java method calls" },
    { "TraceJMMCalls",                OPT_TraceJMMCalls,                OPT_TYPE_BOOLEAN, "trace JMM method calls" },
    { "TraceJNICalls",                OPT_TraceJNICalls,                OPT_TYPE_BOOLEAN, "trace JNI method calls" },
    { "TraceJVMCalls",                OPT_TraceJVMCalls,                OPT_TYPE_BOOLEAN, "trace JVM method calls but omit very frequent ones" },
    { "TraceJVMCallsVerbose",         OPT_TraceJVMCallsVerbose,         OPT_TYPE_BOOLEAN, "trace all JVM method calls" },
#if defined(ENABLE_JVMTI)
    { "TraceJVMTICalls",              OPT_TraceJVMTICalls,              OPT_TYPE_BOOLEAN, "trace JVMTI method calls" },
#endif
    { "TraceLinkClass",               OPT_TraceLinkClass,               OPT_TYPE_BOOLEAN, "trace class linking" },
    { "TraceSubsystemInitialization", OPT_TraceSubsystemInitialization, OPT_TYPE_BOOLEAN, "trace initialization of subsystems" },
    { "TraceTraps",                   OPT_TraceTraps,                   OPT_TYPE_BOOLEAN, "trace traps generated by JIT code" },
#if defined(ENABLE_RT_TIMING)
    { "RtTimingLogfile",              OPT_RtTimingLogfile,              OPT_TYPE_VALUE,   "rt-timing logfile (default: rt-timing.log, use - for stdout)" },
    { "RtTimingCSV",                  OPT_RtTimingCSV,                  OPT_TYPE_BOOLEAN, "enable csv output for rt-timing" },
#endif
#if defined(ENABLE_STATISTICS)
    { "StatisticsLogfile",            OPT_StatisticsLogfile,           OPT_TYPE_VALUE,   "statistics logfile (default: statistics.log, use - for stdout)" },
    { "StatisticsCSV",                OPT_StatisticsCSV,               OPT_TYPE_BOOLEAN, "enable csv output for statistics" },
#endif

    /* end marker */

    { NULL,                           -1,                               -1,               NULL }
};


/* options_get *****************************************************************

   DOCUMENT ME!!!

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

int options_get(opt_struct *opts, JavaVMInitArgs *vm_args)
{
    char *option;
    int   i;

    if (opt_index >= vm_args->nOptions)
        return OPT_DONE;

    /* get the current option */

    option = vm_args->options[opt_index].optionString;

    if ((option == NULL) || (option[0] != '-'))
        return OPT_DONE;

    for (i = 0; opts[i].name; i++) {
        if (!opts[i].arg) {
            /* boolean option found */

            if (strcmp(option + 1, opts[i].name) == 0) {
                opt_index++;
                return opts[i].value;
            }

        } else {
            /* parameter option found */

            /* with a space between */

            if (strcmp(option + 1, opts[i].name) == 0) {
                opt_index++;

                if (opt_index < vm_args->nOptions) {
                    opt_arg = os::strdup(vm_args->options[opt_index].optionString);
                    opt_index++;
                    return opts[i].value;
                }

                return OPT_ERROR;

            } else {
                /* parameter and option have no space between */

                /* FIXME: this assumption is plain wrong, hits you if there is a
                 * parameter with no argument starting with same letter as param with argument
                 * but named after that one, ouch! */

                size_t l = os::strlen(opts[i].name);

                if (os::strlen(option + 1) > l) {
                    if (memcmp(option + 1, opts[i].name, l) == 0) {
                        opt_index++;
                        opt_arg = os::strdup(option + 1 + l);
                        return opts[i].value;
                    }
                }
            }
        }
    }

    return OPT_ERROR;
}


/* options_xxusage *************************************************************

   Print usage message for debugging options.

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

static void options_xxusage(void)
{
    option_t   *opt;
    int         length;
    int         i;
    const char *c;

    /* Prevent compiler warning. */

    length = 0;

    for (opt = options_XX; opt->name != NULL; opt++) {
        printf("    -XX:");

        switch (opt->type) {
        case OPT_TYPE_BOOLEAN:
            printf("+%s", opt->name);
            length = os::strlen("    -XX:+") + os::strlen(opt->name);
            break;

        case OPT_TYPE_VALUE:
            printf("%s=<value>", opt->name);
            length = os::strlen("    -XX:") + os::strlen(opt->name) +
                os::strlen("=<value>");
            break;

        default:
            vm_abort("options_xxusage: unkown option type %d", opt->type);
        }

        /* Check if the help fits into one 80-column line.
           Documentation starts at column 29. */

        if (length < (29 - 1)) {
            /* Print missing spaces up to column 29. */

            for (i = length; i < 29; i++)
                printf(" ");
        }
        else {
            printf("\n");
            printf("                             "); /* 29 spaces */
        }

        /* Check documentation length. */

        length = os::strlen(opt->doc);

        if (length < (80 - 29)) {
            printf("%s", opt->doc);
        }
        else {
            for (c = opt->doc, i = 29; *c != 0; c++, i++) {
                /* If we are at the end of the line, break it. */

                if (i == 80) {
                    printf("\n");
                    printf("                             "); /* 29 spaces */
                    i = 29;
                }

                printf("%c", *c);
            }
        }

        printf("\n");
    }

    cacao::OptionParser::print_usage(cacao::option::xx_root());

    /* exit with error code */

    exit(1);
}


/* options_xx ******************************************************************

   Handle -XX: options.

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

void options_xx(JavaVMInitArgs *vm_args)
{
    const char *name;
    const char *start;
    const char *end;
    int         length;
    int         enable;
    char       *value;
    option_t   *opt;
    const char *filename;
    FILE       *file;
    int         i;

    /* Iterate over all passed options. */

    for (i = 0; i < vm_args->nOptions; i++) {
        /* Get the current option. */

        name = vm_args->options[i].optionString;

        /* Check for help (-XX). */

        if (strcmp(name, "-XX") == 0)
            options_xxusage();

        /* Check if the option start with -XX. */

        start = strstr(name, "-XX:");

        if ((start == NULL) || (start != name))
            continue;

        /* Check if the option is a boolean option. */

        if (name[4] == '+') {
            start  = name + 4 + 1;
            enable = 1;
        }
        else if (name[4] == '-') {
            start  = name + 4 + 1;
            enable = 0;
        }
        else {
            start  = name + 4;
            enable = -1;
        }

        /* Search for a '=' in the option name and get the option name
           length and the value of the option. */

        end = strchr(start, '=');

        if (end == NULL) {
            length = os::strlen(start);
            value  = NULL;
        }
        else {
            length = end - start;
            value  = (char*) (end + 1);
        }

        /* Search the option in the option array. */

        for (opt = options_XX; opt->name != NULL; opt++) {
            if (strncmp(opt->name, start, length) == 0) {
                /* Check if the options passed fits to the type. */

                switch (opt->type) {
                case OPT_TYPE_BOOLEAN:
                    if ((enable == -1) || (value != NULL))
                        options_xxusage();
                    break;
                case OPT_TYPE_VALUE:
                    if ((enable != -1) || (value == NULL))
                        options_xxusage();
                    break;
                default:
                    vm_abort("options_xx: unknown option type %d for option %s",
                             opt->type, opt->name);
                }

                break;
            }
        }

        /* Process the option. */

        switch (opt->value) {

        /* Options which must always be available (production options
           in HotSpot). */

        case OPT_MaxDirectMemorySize:
            opt_MaxDirectMemorySize = os::atoi(value);
            break;

        case OPT_MaxPermSize:
            /* Currently ignored. */
            break;

        case OPT_PermSize:
            /* Currently ignored. */
            break;

        case OPT_ThreadStackSize:
            /* currently ignored */
            break;

        /* Debugging options which can be turned off. */

        case OPT_AlwaysEmitLongBranches:
            opt_AlwaysEmitLongBranches = enable;
            break;

        case OPT_AlwaysMmapFirstPage:
            opt_AlwaysMmapFirstPage = enable;
            break;

        case OPT_CompileAll:
            opt_CompileAll = enable;
            opt_run = false;
            makeinitializations = false;
            break;

        case OPT_CompileMethod:
            opt_CompileMethod = value;
            opt_run = false;
            makeinitializations = false;
            break;

        case OPT_CompileSignature:
            opt_CompileSignature = value;
            break;

        case OPT_DebugLocalReferences:
            opt_DebugLocalReferences = enable;
            break;

        case OPT_DebugLocks:
            opt_DebugLocks = enable;
            break;

        case OPT_DebugPackage:
            opt_DebugPackage = enable;
            break;

        case OPT_DebugPatcher:
            opt_DebugPatcher = enable;
            break;

        case OPT_DebugStackFrameInfo:
            opt_DebugStackFrameInfo = enable;
            break;

        case OPT_DebugStackTrace:
            opt_DebugStackTrace = enable;
            break;

        case OPT_DebugThreads:
            opt_DebugThreads = enable;
            break;

        case OPT_ColorOutput:
            if (value != NULL) {
                if (strcmp("auto",value) == 0)
                    cacao::OStream::set_force_color(0);
                if (strcmp("no",value) == 0)
                    cacao::OStream::set_force_color(-1);
                if (strcmp("yes",value) == 0)
                    cacao::OStream::set_force_color(1);
            }
            break;

#if defined(ENABLE_DISASSEMBLER)
        case OPT_DisassembleStubs:
            opt_DisassembleStubs = enable;
            break;
#endif

#if defined(ENABLE_OPAGENT)
        case OPT_EnableOpagent:
            opt_EnableOpagent = enable;
            break;
#endif

#if defined(ENABLE_GC_CACAO)
        case OPT_GCDebugRootSet:
            opt_GCDebugRootSet = enable;
            break;

        case OPT_GCStress:
            opt_GCStress = enable;
            break;
#endif

#if defined(ENABLE_INLINING)
        case OPT_Inline:
            opt_Inline = enable;
            break;
#if defined(ENABLE_INLINING_DEBUG) || !defined(NDEBUG)
        case OPT_InlineAll:
            opt_InlineAll = enable;
            break;

        case OPT_InlineCount:
            if (value != NULL)
                opt_InlineCount = os::atoi(value);
            break;

        case OPT_InlineMaxSize:
            if (value != NULL)
                opt_InlineMaxSize = os::atoi(value);
            break;

        case OPT_InlineMinSize:
            if (value != NULL)
                opt_InlineMinSize = os::atoi(value);
            break;
        case OPT_InlineMethod:
            // we can not yet set opt_InlineMethodUtf because
            // the utf8 subsystem is not yet initialized!
            //opt_InlineMethodUtf = Utf8String::from_utf8(opt_InlineMethod);
            opt_InlineMethod = value;
            break;
#endif
#endif

        case OPT_PrintConfig:
            opt_PrintConfig = enable;
            break;

        case OPT_PrintWarnings:
            opt_PrintWarnings = enable;
            break;

        case OPT_ProfileGCMemoryUsage:
            if (value == NULL)
                opt_ProfileGCMemoryUsage = 5;
            else
                opt_ProfileGCMemoryUsage = os::atoi(value);
            break;

        case OPT_ProfileMemoryUsage:
            if (value == NULL)
                opt_ProfileMemoryUsage = 5;
            else
                opt_ProfileMemoryUsage = os::atoi(value);

# if defined(ENABLE_STATISTICS)
            /* we also need statistics */

            opt_stat = true;
# endif
            break;

        case OPT_ProfileMemoryUsageGNUPlot:
            if (value == NULL)
                filename = "profile.dat";
            else
                filename = value;

            file = fopen(filename, "w");

            if (file == NULL)
                /* FIXME Use below method instead! */
                //os::abort_errno("options_xx: fopen failed");
                vm_abort("options_xx: fopen failed");

            opt_ProfileMemoryUsageGNUPlot = file;
            break;

        case OPT_RegallocSpillAll:
            opt_RegallocSpillAll = enable;
            break;

#if defined(ENABLE_REPLACEMENT)
        case OPT_ReplaceMethod:
            opt_ReplaceMethod = value;
            break;

        case OPT_OptimizeMethod:
            opt_OptimizeMethod = value;
            break;

        case OPT_DisableCountdownTraps:
            opt_DisableCountdownTraps = true;
            break;
#endif

        case OPT_TraceBuiltinCalls:
            opt_TraceBuiltinCalls = enable;
            break;

        case OPT_TraceCompilerCalls:
            opt_TraceCompilerCalls = enable;
            break;

        case OPT_TraceExceptions:
            opt_TraceExceptions = enable;
            break;

        case OPT_TraceHPI:
            opt_TraceHPI = enable;
            break;

#if defined(ENABLE_INLINING) && !defined(NDEBUG)
        case OPT_TraceInlining:
            if (value == NULL)
                opt_TraceInlining = 1;
            else
                opt_TraceInlining = os::atoi(value);
            break;
#endif

        case OPT_TraceJavaCalls:
            opt_verbosecall = enable;
            opt_TraceJavaCalls = enable;
            break;

        case OPT_TraceJMMCalls:
            opt_TraceJMMCalls = enable;
            break;

        case OPT_TraceJNICalls:
            opt_TraceJNICalls = enable;
            break;

        case OPT_TraceJVMCalls:
            opt_TraceJVMCalls = enable;
            break;

        case OPT_TraceJVMCallsVerbose:
            opt_TraceJVMCallsVerbose = enable;
            break;

#if defined(ENABLE_JVMTI)
        case OPT_TraceJVMTICalls:
            opt_TraceJVMTICalls = enable;
            break;
#endif

        case OPT_TraceLinkClass:
            opt_TraceLinkClass = enable;
            break;

        case OPT_TraceSubsystemInitialization:
            opt_TraceSubsystemInitialization = enable;
            break;

        case OPT_TraceTraps:
            opt_TraceTraps = enable;
            break;

#if defined(ENABLE_RT_TIMING)
        case OPT_RtTimingLogfile:
            if (value == NULL)
                break;
            else
                filename = value;

            if ( (strnlen(filename, 2) == 1) && (filename[0] == '-') ) {
                file = stdout;
            } else {
                file = fopen(filename, "w");

                if (file == NULL)
                    os::abort_errno("options_xx: fopen failed");
            }

            opt_RtTimingLogfile = file;
            break;
        case OPT_RtTimingCSV:
            opt_RtTimingCSV = enable;
            break;
#endif

#if defined(ENABLE_STATISTICS)
        case OPT_StatisticsLogfile:
            if (value == NULL)
                break;
            else
                filename = value;

            if ( (strnlen(filename, 2) == 1) && (filename[0] == '-') ) {
                file = stdout;
            } else {
                file = fopen(filename, "w");

                if (file == NULL)
                    os::abort_errno("options_xx: fopen failed");
            }

            opt_StatisticsLogfile = file;
            break;
        case OPT_StatisticsCSV:
            opt_StatisticsCSV = enable;
            break;
#endif

        default: {

                size_t name_len = strlen(name);
                size_t value_len = 0;
                if (value) {
                    size_t tmp_name_len = (value - name) / sizeof(char);
                    value_len = name_len - tmp_name_len;
                    name_len = tmp_name_len - 1;
                    assert(name[name_len] == '=');
                }
                else {
                    assert(name[name_len] == '\0');
                }

                if(!cacao::OptionParser::parse_option(cacao::option::xx_root(),
                        name, name_len, value, value_len)) {
                    fprintf(stderr, "Unknown -XX option: %s\n", name);
                }
                break;
            }
        }
    }
}


/*
 * These are local overrides for various environment variables in Emacs.
 * Please do not remove this and leave it at the end of the file, where
 * Emacs will automagically detect them.
 * ---------------------------------------------------------------------
 * Local variables:
 * mode: c++
 * indent-tabs-mode: t
 * c-basic-offset: 4
 * tab-width: 4
 * End:
 * vim:noexpandtab:sw=4:ts=4:
 */