Check in the pristine copy of ICU 4.6...

icu46/source/tools/toolutil/pkg_genc.c

+/******************************************************************************
+ *   Copyright (C) 2009-2010, International Business Machines
+ *   Corporation and others.  All Rights Reserved.
+ *******************************************************************************
+ */
+#include "unicode/utypes.h"
+
+#ifdef U_WINDOWS
+#   define VC_EXTRALEAN
+#   define WIN32_LEAN_AND_MEAN
+#   define NOUSER
+#   define NOSERVICE
+#   define NOIME
+#   define NOMCX
+#include <windows.h>
+#include <time.h>
+#   ifdef __GNUC__
+#       define WINDOWS_WITH_GNUC
+#   endif
+#endif
+
+#ifdef U_LINUX
+#   define U_ELF
+#endif
+
+#ifdef U_ELF
+#   include <elf.h>
+#   if defined(ELFCLASS64)
+#       define U_ELF64
+#   endif
+    /* Old elf.h headers may not have EM_X86_64, or have EM_X8664 instead. */
+#   ifndef EM_X86_64
+#       define EM_X86_64 62
+#   endif
+#   define ICU_ENTRY_OFFSET 0
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "unicode/putil.h"
+#include "cmemory.h"
+#include "cstring.h"
+#include "filestrm.h"
+#include "toolutil.h"
+#include "unicode/uclean.h"
+#include "uoptions.h"
+#include "pkg_genc.h"
+
+#define MAX_COLUMN ((uint32_t)(0xFFFFFFFFU))
+
+#define HEX_0X 0 /*  0x1234 */
+#define HEX_0H 1 /*  01234h */
+
+#if defined(U_WINDOWS) || defined(U_ELF)
+#define CAN_GENERATE_OBJECTS
+#endif
+
+/* prototypes --------------------------------------------------------------- */
+static void
+getOutFilename(const char *inFilename, const char *destdir, char *outFilename, char *entryName, const char *newSuffix, const char *optFilename);
+
+static uint32_t
+write8(FileStream *out, uint8_t byte, uint32_t column);
+
+static uint32_t
+write32(FileStream *out, uint32_t byte, uint32_t column);
+
+#ifdef OS400
+static uint32_t
+write8str(FileStream *out, uint8_t byte, uint32_t column);
+#endif
+/* -------------------------------------------------------------------------- */
+
+/*
+Creating Template Files for New Platforms
+
+Let the cc compiler help you get started.
+Compile this program
+    const unsigned int x[5] = {1, 2, 0xdeadbeef, 0xffffffff, 16};
+with the -S option to produce assembly output.
+
+For example, this will generate array.s:
+gcc -S array.c
+
+This will produce a .s file that may look like this:
+
+    .file   "array.c"
+    .version        "01.01"
+gcc2_compiled.:
+    .globl x
+    .section        .rodata
+    .align 4
+    .type    x,@object
+    .size    x,20
+x:
+    .long   1
+    .long   2
+    .long   -559038737
+    .long   -1
+    .long   16
+    .ident  "GCC: (GNU) 2.96 20000731 (Red Hat Linux 7.1 2.96-85)"
+
+which gives a starting point that will compile, and can be transformed
+to become the template, generally with some consulting of as docs and
+some experimentation.
+
+If you want ICU to automatically use this assembly, you should
+specify "GENCCODE_ASSEMBLY=-a name" in the specific config/mh-* file,
+where the name is the compiler or platform that you used in this
+assemblyHeader data structure.
+*/
+static const struct AssemblyType {
+    const char *name;
+    const char *header;
+    const char *beginLine;
+    const char *footer;
+    int8_t      hexType; /* HEX_0X or HEX_0h */
+} assemblyHeader[] = {
+    {"gcc",
+        ".globl %s\n"
+        "\t.section .note.GNU-stack,\"\",%%progbits\n"
+        "\t.section .rodata\n"
+        "\t.align 8\n" /* Either align 8 bytes or 2^8 (256) bytes. 8 bytes is needed. */
+        "\t.type %s,%%object\n"
+        "%s:\n\n",
+
+        ".long ","",HEX_0X
+    },
+    {"gcc-darwin",
+        /*"\t.section __TEXT,__text,regular,pure_instructions\n"
+        "\t.section __TEXT,__picsymbolstub1,symbol_stubs,pure_instructions,32\n"*/
+        ".globl _%s\n"
+        "\t.data\n"
+        "\t.const\n"
+        "\t.align 4\n"  /* 1<<4 = 16 */
+        "_%s:\n\n",
+
+        ".long ","",HEX_0X
+    },
+    {"gcc-cygwin",
+        ".globl _%s\n"
+        "\t.section .rodata\n"
+        "\t.align 8\n" /* Either align 8 bytes or 2^8 (256) bytes. 8 bytes is needed. */
+        "_%s:\n\n",
+
+        ".long ","",HEX_0X
+    },
+    {"sun",
+        "\t.section \".rodata\"\n"
+        "\t.align   8\n"
+        ".globl     %s\n"
+        "%s:\n",
+
+        ".word ","",HEX_0X
+    },
+    {"sun-x86",
+        "Drodata.rodata:\n"
+        "\t.type   Drodata.rodata,@object\n"
+        "\t.size   Drodata.rodata,0\n"
+        "\t.globl  %s\n"
+        "\t.align  8\n"
+        "%s:\n",
+
+        ".4byte ","",HEX_0X
+    },
+    {"xlc",
+        ".globl %s{RO}\n"
+        "\t.toc\n"
+        "%s:\n"
+        "\t.csect %s{RO}, 4\n",
+
+        ".long ","",HEX_0X
+    },
+    {"aCC-ia64",
+        "\t.file   \"%s.s\"\n"
+        "\t.type   %s,@object\n"
+        "\t.global %s\n"
+        "\t.secalias .abe$0.rodata, \".rodata\"\n"
+        "\t.section .abe$0.rodata = \"a\", \"progbits\"\n"
+        "\t.align  16\n"
+        "%s::\t",
+
+        "data4 ","",HEX_0X
+    },
+    {"aCC-parisc",
+        "\t.SPACE  $TEXT$\n"
+        "\t.SUBSPA $LIT$\n"
+        "%s\n"
+        "\t.EXPORT %s\n"
+        "\t.ALIGN  16\n",
+
+        ".WORD ","",HEX_0X
+    },
+    { "masm",
+      "\tTITLE %s\n"
+      "; generated by genccode\n"
+      ".386\n"
+      ".model flat\n"
+      "\tPUBLIC _%s\n"
+      "ICUDATA_%s\tSEGMENT READONLY PARA PUBLIC FLAT 'DATA'\n"
+      "\tALIGN 16\n"
+      "_%s\tLABEL DWORD\n",
+      "\tDWORD ","\nICUDATA_%s\tENDS\n\tEND\n",HEX_0H
+    }
+};
+
+static int32_t assemblyHeaderIndex = -1;
+static int32_t hexType = HEX_0X;
+
+U_CAPI UBool U_EXPORT2
+checkAssemblyHeaderName(const char* optAssembly) {
+    int32_t idx;
+    assemblyHeaderIndex = -1;
+    for (idx = 0; idx < (int32_t)(sizeof(assemblyHeader)/sizeof(assemblyHeader[0])); idx++) {
+        if (uprv_strcmp(optAssembly, assemblyHeader[idx].name) == 0) {
+            assemblyHeaderIndex = idx;
+            hexType = assemblyHeader[idx].hexType; /* set the hex type */
+            return TRUE;
+        }
+    }
+
+    return FALSE;
+}
+
+
+U_CAPI void U_EXPORT2
+printAssemblyHeadersToStdErr(void) {
+    int32_t idx;
+    fprintf(stderr, "%s", assemblyHeader[0].name);
+    for (idx = 1; idx < (int32_t)(sizeof(assemblyHeader)/sizeof(assemblyHeader[0])); idx++) {
+        fprintf(stderr, ", %s", assemblyHeader[idx].name);
+    }
+    fprintf(stderr,
+        ")\n");
+}
+
+U_CAPI void U_EXPORT2
+writeAssemblyCode(const char *filename, const char *destdir, const char *optEntryPoint, const char *optFilename, char *outFilePath) {
+    uint32_t column = MAX_COLUMN;
+    char entry[64];
+    uint32_t buffer[1024];
+    char *bufferStr = (char *)buffer;
+    FileStream *in, *out;
+    size_t i, length;
+
+    in=T_FileStream_open(filename, "rb");
+    if(in==NULL) {
+        fprintf(stderr, "genccode: unable to open input file %s\n", filename);
+        exit(U_FILE_ACCESS_ERROR);
+    }
+
+    getOutFilename(filename, destdir, bufferStr, entry, ".s", optFilename);
+    out=T_FileStream_open(bufferStr, "w");
+    if(out==NULL) {
+        fprintf(stderr, "genccode: unable to open output file %s\n", bufferStr);
+        exit(U_FILE_ACCESS_ERROR);
+    }
+
+    if (outFilePath != NULL) {
+        uprv_strcpy(outFilePath, bufferStr);
+    }
+
+#ifdef WINDOWS_WITH_GNUC
+    /* Need to fix the file seperator character when using MinGW. */
+    swapFileSepChar(outFilePath, U_FILE_SEP_CHAR, '/');
+#endif
+
+    if(optEntryPoint != NULL) {
+        uprv_strcpy(entry, optEntryPoint);
+        uprv_strcat(entry, "_dat");
+    }
+
+    /* turn dashes or dots in the entry name into underscores */
+    length=uprv_strlen(entry);
+    for(i=0; i<length; ++i) {
+        if(entry[i]=='-' || entry[i]=='.') {
+            entry[i]='_';
+        }
+    }
+
+    sprintf(bufferStr, assemblyHeader[assemblyHeaderIndex].header,
+        entry, entry, entry, entry,
+        entry, entry, entry, entry);
+    T_FileStream_writeLine(out, bufferStr);
+    T_FileStream_writeLine(out, assemblyHeader[assemblyHeaderIndex].beginLine);
+
+    for(;;) {
+        length=T_FileStream_read(in, buffer, sizeof(buffer));
+        if(length==0) {
+            break;
+        }
+        if (length != sizeof(buffer)) {
+            /* pad with extra 0's when at the end of the file */
+            for(i=0; i < (length % sizeof(uint32_t)); ++i) {
+                buffer[length+i] = 0;
+            }
+        }
+        for(i=0; i<(length/sizeof(buffer[0])); i++) {
+            column = write32(out, buffer[i], column);
+        }
+    }
+
+    T_FileStream_writeLine(out, "\n");
+
+    sprintf(bufferStr, assemblyHeader[assemblyHeaderIndex].footer,
+        entry, entry, entry, entry,
+        entry, entry, entry, entry);
+    T_FileStream_writeLine(out, bufferStr);
+
+    if(T_FileStream_error(in)) {
+        fprintf(stderr, "genccode: file read error while generating from file %s\n", filename);
+        exit(U_FILE_ACCESS_ERROR);
+    }
+
+    if(T_FileStream_error(out)) {
+        fprintf(stderr, "genccode: file write error while generating from file %s\n", filename);
+        exit(U_FILE_ACCESS_ERROR);
+    }
+
+    T_FileStream_close(out);
+    T_FileStream_close(in);
+}
+
+U_CAPI void U_EXPORT2
+writeCCode(const char *filename, const char *destdir, const char *optName, const char *optFilename, char *outFilePath) {
+    uint32_t column = MAX_COLUMN;
+    char buffer[4096], entry[64];
+    FileStream *in, *out;
+    size_t i, length;
+
+    in=T_FileStream_open(filename, "rb");
+    if(in==NULL) {
+        fprintf(stderr, "genccode: unable to open input file %s\n", filename);
+        exit(U_FILE_ACCESS_ERROR);
+    }
+
+    if(optName != NULL) { /* prepend  'icudt28_' */
+      strcpy(entry, optName);
+      strcat(entry, "_");
+    } else {
+      entry[0] = 0;
+    }
+
+    getOutFilename(filename, destdir, buffer, entry+uprv_strlen(entry), ".c", optFilename);
+    if (outFilePath != NULL) {
+        uprv_strcpy(outFilePath, buffer);
+    }
+    out=T_FileStream_open(buffer, "w");
+    if(out==NULL) {
+        fprintf(stderr, "genccode: unable to open output file %s\n", buffer);
+        exit(U_FILE_ACCESS_ERROR);
+    }
+
+    /* turn dashes or dots in the entry name into underscores */
+    length=uprv_strlen(entry);
+    for(i=0; i<length; ++i) {
+        if(entry[i]=='-' || entry[i]=='.') {
+            entry[i]='_';
+        }
+    }
+
+#ifdef OS400
+    /*
+    TODO: Fix this once the compiler implements this feature. Keep in sync with udatamem.c
+
+    This is here because this platform can't currently put
+    const data into the read-only pages of an object or
+    shared library (service program). Only strings are allowed in read-only
+    pages, so we use char * strings to store the data.
+
+    In order to prevent the beginning of the data from ever matching the
+    magic numbers we must still use the initial double.
+    [grhoten 4/24/2003]
+    */
+    sprintf(buffer,
+        "#define U_DISABLE_RENAMING 1\n"
+        "#include \"unicode/umachine.h\"\n"
+        "U_CDECL_BEGIN\n"
+        "const struct {\n"
+        "    double bogus;\n"
+        "    const char *bytes; \n"
+        "} %s={ 0.0, \n",
+        entry);
+    T_FileStream_writeLine(out, buffer);
+
+    for(;;) {
+        length=T_FileStream_read(in, buffer, sizeof(buffer));
+        if(length==0) {
+            break;
+        }
+        for(i=0; i<length; ++i) {
+            column = write8str(out, (uint8_t)buffer[i], column);
+        }
+    }
+
+    T_FileStream_writeLine(out, "\"\n};\nU_CDECL_END\n");
+#else
+    /* Function renaming shouldn't be done in data */
+    sprintf(buffer,
+        "#define U_DISABLE_RENAMING 1\n"
+        "#include \"unicode/umachine.h\"\n"
+        "U_CDECL_BEGIN\n"
+        "const struct {\n"
+        "    double bogus;\n"
+        "    uint8_t bytes[%ld]; \n"
+        "} %s={ 0.0, {\n",
+        (long)T_FileStream_size(in), entry);
+    T_FileStream_writeLine(out, buffer);
+
+    for(;;) {
+        length=T_FileStream_read(in, buffer, sizeof(buffer));
+        if(length==0) {
+            break;
+        }
+        for(i=0; i<length; ++i) {
+            column = write8(out, (uint8_t)buffer[i], column);
+        }
+    }
+
+    T_FileStream_writeLine(out, "\n}\n};\nU_CDECL_END\n");
+#endif
+
+    if(T_FileStream_error(in)) {
+        fprintf(stderr, "genccode: file read error while generating from file %s\n", filename);
+        exit(U_FILE_ACCESS_ERROR);
+    }
+
+    if(T_FileStream_error(out)) {
+        fprintf(stderr, "genccode: file write error while generating from file %s\n", filename);
+        exit(U_FILE_ACCESS_ERROR);
+    }
+
+    T_FileStream_close(out);
+    T_FileStream_close(in);
+}
+
+static uint32_t
+write32(FileStream *out, uint32_t bitField, uint32_t column) {
+    int32_t i;
+    char bitFieldStr[64]; /* This is more bits than needed for a 32-bit number */
+    char *s = bitFieldStr;
+    uint8_t *ptrIdx = (uint8_t *)&bitField;
+    static const char hexToStr[16] = {
+        '0','1','2','3',
+        '4','5','6','7',
+        '8','9','A','B',
+        'C','D','E','F'
+    };
+
+    /* write the value, possibly with comma and newline */
+    if(column==MAX_COLUMN) {
+        /* first byte */
+        column=1;
+    } else if(column<32) {
+        *(s++)=',';
+        ++column;
+    } else {
+        *(s++)='\n';
+        uprv_strcpy(s, assemblyHeader[assemblyHeaderIndex].beginLine);
+        s+=uprv_strlen(s);
+        column=1;
+    }
+
+    if (bitField < 10) {
+        /* It's a small number. Don't waste the space for 0x */
+        *(s++)=hexToStr[bitField];
+    }
+    else {
+        int seenNonZero = 0; /* This is used to remove leading zeros */
+
+        if(hexType==HEX_0X) {
+         *(s++)='0';
+         *(s++)='x';
+        } else if(hexType==HEX_0H) {
+         *(s++)='0';
+        }
+
+        /* This creates a 32-bit field */
+#if U_IS_BIG_ENDIAN
+        for (i = 0; i < sizeof(uint32_t); i++)
+#else
+        for (i = sizeof(uint32_t)-1; i >= 0 ; i--)
+#endif
+        {
+            uint8_t value = ptrIdx[i];
+            if (value || seenNonZero) {
+                *(s++)=hexToStr[value>>4];
+                *(s++)=hexToStr[value&0xF];
+                seenNonZero = 1;
+            }
+        }
+        if(hexType==HEX_0H) {
+         *(s++)='h';
+        }
+    }
+
+    *(s++)=0;
+    T_FileStream_writeLine(out, bitFieldStr);
+    return column;
+}
+
+static uint32_t
+write8(FileStream *out, uint8_t byte, uint32_t column) {
+    char s[4];
+    int i=0;
+
+    /* convert the byte value to a string */
+    if(byte>=100) {
+        s[i++]=(char)('0'+byte/100);
+        byte%=100;
+    }
+    if(i>0 || byte>=10) {
+        s[i++]=(char)('0'+byte/10);
+        byte%=10;
+    }
+    s[i++]=(char)('0'+byte);
+    s[i]=0;
+
+    /* write the value, possibly with comma and newline */
+    if(column==MAX_COLUMN) {
+        /* first byte */
+        column=1;
+    } else if(column<16) {
+        T_FileStream_writeLine(out, ",");
+        ++column;
+    } else {
+        T_FileStream_writeLine(out, ",\n");
+        column=1;
+    }
+    T_FileStream_writeLine(out, s);
+    return column;
+}
+
+#ifdef OS400
+static uint32_t
+write8str(FileStream *out, uint8_t byte, uint32_t column) {
+    char s[8];
+
+    if (byte > 7)
+        sprintf(s, "\\x%X", byte);
+    else
+        sprintf(s, "\\%X", byte);
+
+    /* write the value, possibly with comma and newline */
+    if(column==MAX_COLUMN) {
+        /* first byte */
+        column=1;
+        T_FileStream_writeLine(out, "\"");
+    } else if(column<24) {
+        ++column;
+    } else {
+        T_FileStream_writeLine(out, "\"\n\"");
+        column=1;
+    }
+    T_FileStream_writeLine(out, s);
+    return column;
+}
+#endif
+
+static void
+getOutFilename(const char *inFilename, const char *destdir, char *outFilename, char *entryName, const char *newSuffix, const char *optFilename) {
+    const char *basename=findBasename(inFilename), *suffix=uprv_strrchr(basename, '.');
+
+    /* copy path */
+    if(destdir!=NULL && *destdir!=0) {
+        do {
+            *outFilename++=*destdir++;
+        } while(*destdir!=0);
+        if(*(outFilename-1)!=U_FILE_SEP_CHAR) {
+            *outFilename++=U_FILE_SEP_CHAR;
+        }
+        inFilename=basename;
+    } else {
+        while(inFilename<basename) {
+            *outFilename++=*inFilename++;
+        }
+    }
+
+    if(suffix==NULL) {
+        /* the filename does not have a suffix */
+        uprv_strcpy(entryName, inFilename);
+        if(optFilename != NULL) {
+          uprv_strcpy(outFilename, optFilename);
+        } else {
+          uprv_strcpy(outFilename, inFilename);
+        }
+        uprv_strcat(outFilename, newSuffix);
+    } else {
+        char *saveOutFilename = outFilename;
+        /* copy basename */
+        while(inFilename<suffix) {
+            if(*inFilename=='-') {
+                /* iSeries cannot have '-' in the .o objects. */
+                *outFilename++=*entryName++='_';
+                inFilename++;
+            }
+            else {
+                *outFilename++=*entryName++=*inFilename++;
+            }
+        }
+
+        /* replace '.' by '_' */
+        *outFilename++=*entryName++='_';
+        ++inFilename;
+
+        /* copy suffix */
+        while(*inFilename!=0) {
+            *outFilename++=*entryName++=*inFilename++;
+        }
+
+        *entryName=0;
+
+        if(optFilename != NULL) {
+            uprv_strcpy(saveOutFilename, optFilename);
+            uprv_strcat(saveOutFilename, newSuffix);
+        } else {
+            /* add ".c" */
+            uprv_strcpy(outFilename, newSuffix);
+        }
+    }
+}
+
+#ifdef CAN_GENERATE_OBJECTS
+static void
+getArchitecture(uint16_t *pCPU, uint16_t *pBits, UBool *pIsBigEndian, const char *optMatchArch) {
+    union {
+        char        bytes[2048];
+#ifdef U_ELF
+        Elf32_Ehdr  header32;
+        /* Elf32_Ehdr and ELF64_Ehdr are identical for the necessary fields. */
+#elif defined(U_WINDOWS)
+        IMAGE_FILE_HEADER header;
+#endif
+    } buffer;
+
+    const char *filename;
+    FileStream *in;
+    int32_t length;
+
+#ifdef U_ELF
+
+#elif defined(U_WINDOWS)
+    const IMAGE_FILE_HEADER *pHeader;
+#else
+#   error "Unknown platform for CAN_GENERATE_OBJECTS."
+#endif
+
+    if(optMatchArch != NULL) {
+        filename=optMatchArch;
+    } else {
+        /* set defaults */
+#ifdef U_ELF
+        /* set EM_386 because elf.h does not provide better defaults */
+        *pCPU=EM_386;
+        *pBits=32;
+        *pIsBigEndian=(UBool)(U_IS_BIG_ENDIAN ? ELFDATA2MSB : ELFDATA2LSB);
+#elif defined(U_WINDOWS)
+/* _M_IA64 should be defined in windows.h */
+#   if defined(_M_IA64)
+        *pCPU=IMAGE_FILE_MACHINE_IA64;
+#   elif defined(_M_AMD64)
+        *pCPU=IMAGE_FILE_MACHINE_AMD64;
+#   else
+        *pCPU=IMAGE_FILE_MACHINE_I386;
+#   endif
+        *pBits= *pCPU==IMAGE_FILE_MACHINE_I386 ? 32 : 64;
+        *pIsBigEndian=FALSE;
+#else
+#   error "Unknown platform for CAN_GENERATE_OBJECTS."
+#endif
+        return;
+    }
+
+    in=T_FileStream_open(filename, "rb");
+    if(in==NULL) {
+        fprintf(stderr, "genccode: unable to open match-arch file %s\n", filename);
+        exit(U_FILE_ACCESS_ERROR);
+    }
+    length=T_FileStream_read(in, buffer.bytes, sizeof(buffer.bytes));
+
+#ifdef U_ELF
+    if(length<sizeof(Elf32_Ehdr)) {
+        fprintf(stderr, "genccode: match-arch file %s is too short\n", filename);
+        exit(U_UNSUPPORTED_ERROR);
+    }
+    if(
+        buffer.header32.e_ident[0]!=ELFMAG0 ||
+        buffer.header32.e_ident[1]!=ELFMAG1 ||
+        buffer.header32.e_ident[2]!=ELFMAG2 ||
+        buffer.header32.e_ident[3]!=ELFMAG3 ||
+        buffer.header32.e_ident[EI_CLASS]<ELFCLASS32 || buffer.header32.e_ident[EI_CLASS]>ELFCLASS64
+    ) {
+        fprintf(stderr, "genccode: match-arch file %s is not an ELF object file, or not supported\n", filename);
+        exit(U_UNSUPPORTED_ERROR);
+    }
+
+    *pBits= buffer.header32.e_ident[EI_CLASS]==ELFCLASS32 ? 32 : 64; /* only 32 or 64: see check above */
+#ifdef U_ELF64
+    if(*pBits!=32 && *pBits!=64) {
+        fprintf(stderr, "genccode: currently only supports 32-bit and 64-bit ELF format\n");
+        exit(U_UNSUPPORTED_ERROR);
+    }
+#else
+    if(*pBits!=32) {
+        fprintf(stderr, "genccode: built with elf.h missing 64-bit definitions\n");
+        exit(U_UNSUPPORTED_ERROR);
+    }
+#endif
+
+    *pIsBigEndian=(UBool)(buffer.header32.e_ident[EI_DATA]==ELFDATA2MSB);
+    if(*pIsBigEndian!=U_IS_BIG_ENDIAN) {
+        fprintf(stderr, "genccode: currently only same-endianness ELF formats are supported\n");
+        exit(U_UNSUPPORTED_ERROR);
+    }
+    /* TODO: Support byte swapping */
+
+    *pCPU=buffer.header32.e_machine;
+#elif defined(U_WINDOWS)
+    if(length<sizeof(IMAGE_FILE_HEADER)) {
+        fprintf(stderr, "genccode: match-arch file %s is too short\n", filename);
+        exit(U_UNSUPPORTED_ERROR);
+    }
+    /* TODO: Use buffer.header.  Keep aliasing legal.  */
+    pHeader=(const IMAGE_FILE_HEADER *)buffer.bytes;
+    *pCPU=pHeader->Machine;
+    /*
+     * The number of bits is implicit with the Machine value.
+     * *pBits is ignored in the calling code, so this need not be precise.
+     */
+    *pBits= *pCPU==IMAGE_FILE_MACHINE_I386 ? 32 : 64;
+    /* Windows always runs on little-endian CPUs. */
+    *pIsBigEndian=FALSE;
+#else
+#   error "Unknown platform for CAN_GENERATE_OBJECTS."
+#endif
+
+    T_FileStream_close(in);
+}
+
+U_CAPI void U_EXPORT2
+writeObjectCode(const char *filename, const char *destdir, const char *optEntryPoint, const char *optMatchArch, const char *optFilename, char *outFilePath) {
+    /* common variables */
+    char buffer[4096], entry[40]={ 0 };
+    FileStream *in, *out;
+    const char *newSuffix;
+    int32_t i, entryLength, length, size, entryOffset=0, entryLengthOffset=0;
+
+    uint16_t cpu, bits;
+    UBool makeBigEndian;
+
+    /* platform-specific variables and initialization code */
+#ifdef U_ELF
+    /* 32-bit Elf file header */
+    static Elf32_Ehdr header32={
+        {
+            /* e_ident[] */
+            ELFMAG0, ELFMAG1, ELFMAG2, ELFMAG3,
+            ELFCLASS32,
+            U_IS_BIG_ENDIAN ? ELFDATA2MSB : ELFDATA2LSB,
+            EV_CURRENT /* EI_VERSION */
+        },
+        ET_REL,
+        EM_386,
+        EV_CURRENT, /* e_version */
+        0, /* e_entry */
+        0, /* e_phoff */
+        (Elf32_Off)sizeof(Elf32_Ehdr), /* e_shoff */
+        0, /* e_flags */
+        (Elf32_Half)sizeof(Elf32_Ehdr), /* eh_size */
+        0, /* e_phentsize */
+        0, /* e_phnum */
+        (Elf32_Half)sizeof(Elf32_Shdr), /* e_shentsize */
+        5, /* e_shnum */
+        2 /* e_shstrndx */
+    };
+
+    /* 32-bit Elf section header table */
+    static Elf32_Shdr sectionHeaders32[5]={
+        { /* SHN_UNDEF */
+            0
+        },
+        { /* .symtab */
+            1, /* sh_name */
+            SHT_SYMTAB,
+            0, /* sh_flags */
+            0, /* sh_addr */
+            (Elf32_Off)(sizeof(header32)+sizeof(sectionHeaders32)), /* sh_offset */
+            (Elf32_Word)(2*sizeof(Elf32_Sym)), /* sh_size */
+            3, /* sh_link=sect hdr index of .strtab */
+            1, /* sh_info=One greater than the symbol table index of the last
+                * local symbol (with STB_LOCAL). */
+            4, /* sh_addralign */
+            (Elf32_Word)(sizeof(Elf32_Sym)) /* sh_entsize */
+        },
+        { /* .shstrtab */
+            9, /* sh_name */
+            SHT_STRTAB,
+            0, /* sh_flags */
+            0, /* sh_addr */
+            (Elf32_Off)(sizeof(header32)+sizeof(sectionHeaders32)+2*sizeof(Elf32_Sym)), /* sh_offset */
+            40, /* sh_size */
+            0, /* sh_link */
+            0, /* sh_info */
+            1, /* sh_addralign */
+            0 /* sh_entsize */
+        },
+        { /* .strtab */
+            19, /* sh_name */
+            SHT_STRTAB,
+            0, /* sh_flags */
+            0, /* sh_addr */
+            (Elf32_Off)(sizeof(header32)+sizeof(sectionHeaders32)+2*sizeof(Elf32_Sym)+40), /* sh_offset */
+            (Elf32_Word)sizeof(entry), /* sh_size */
+            0, /* sh_link */
+            0, /* sh_info */
+            1, /* sh_addralign */
+            0 /* sh_entsize */
+        },
+        { /* .rodata */
+            27, /* sh_name */
+            SHT_PROGBITS,
+            SHF_ALLOC, /* sh_flags */
+            0, /* sh_addr */
+            (Elf32_Off)(sizeof(header32)+sizeof(sectionHeaders32)+2*sizeof(Elf32_Sym)+40+sizeof(entry)), /* sh_offset */
+            0, /* sh_size */
+            0, /* sh_link */
+            0, /* sh_info */
+            16, /* sh_addralign */
+            0 /* sh_entsize */
+        }
+    };
+
+    /* symbol table */
+    static Elf32_Sym symbols32[2]={
+        { /* STN_UNDEF */
+            0
+        },
+        { /* data entry point */
+            1, /* st_name */
+            0, /* st_value */
+            0, /* st_size */
+            ELF64_ST_INFO(STB_GLOBAL, STT_OBJECT),
+            0, /* st_other */
+            4 /* st_shndx=index of related section table entry */
+        }
+    };
+
+    /* section header string table, with decimal string offsets */
+    static const char sectionStrings[40]=
+        /*  0 */ "\0"
+        /*  1 */ ".symtab\0"
+        /*  9 */ ".shstrtab\0"
+        /* 19 */ ".strtab\0"
+        /* 27 */ ".rodata\0"
+        /* 35 */ "\0\0\0\0"; /* contains terminating NUL */
+        /* 40: padded to multiple of 8 bytes */
+
+    /*
+     * Use entry[] for the string table which will contain only the
+     * entry point name.
+     * entry[0] must be 0 (NUL)
+     * The entry point name can be up to 38 characters long (sizeof(entry)-2).
+     */
+
+    /* 16-align .rodata in the .o file, just in case */
+    static const char padding[16]={ 0 };
+    int32_t paddingSize;
+
+#ifdef U_ELF64
+    /* 64-bit Elf file header */
+    static Elf64_Ehdr header64={
+        {
+            /* e_ident[] */
+            ELFMAG0, ELFMAG1, ELFMAG2, ELFMAG3,
+            ELFCLASS64,
+            U_IS_BIG_ENDIAN ? ELFDATA2MSB : ELFDATA2LSB,
+            EV_CURRENT /* EI_VERSION */
+        },
+        ET_REL,
+        EM_X86_64,
+        EV_CURRENT, /* e_version */
+        0, /* e_entry */
+        0, /* e_phoff */
+        (Elf64_Off)sizeof(Elf64_Ehdr), /* e_shoff */
+        0, /* e_flags */
+        (Elf64_Half)sizeof(Elf64_Ehdr), /* eh_size */
+        0, /* e_phentsize */
+        0, /* e_phnum */
+        (Elf64_Half)sizeof(Elf64_Shdr), /* e_shentsize */
+        5, /* e_shnum */
+        2 /* e_shstrndx */
+    };
+
+    /* 64-bit Elf section header table */
+    static Elf64_Shdr sectionHeaders64[5]={
+        { /* SHN_UNDEF */
+            0
+        },
+        { /* .symtab */
+            1, /* sh_name */
+            SHT_SYMTAB,
+            0, /* sh_flags */
+            0, /* sh_addr */
+            (Elf64_Off)(sizeof(header64)+sizeof(sectionHeaders64)), /* sh_offset */
+            (Elf64_Xword)(2*sizeof(Elf64_Sym)), /* sh_size */
+            3, /* sh_link=sect hdr index of .strtab */
+            1, /* sh_info=One greater than the symbol table index of the last
+                * local symbol (with STB_LOCAL). */
+            4, /* sh_addralign */
+            (Elf64_Xword)(sizeof(Elf64_Sym)) /* sh_entsize */
+        },
+        { /* .shstrtab */
+            9, /* sh_name */
+            SHT_STRTAB,
+            0, /* sh_flags */
+            0, /* sh_addr */
+            (Elf64_Off)(sizeof(header64)+sizeof(sectionHeaders64)+2*sizeof(Elf64_Sym)), /* sh_offset */
+            40, /* sh_size */
+            0, /* sh_link */
+            0, /* sh_info */
+            1, /* sh_addralign */
+            0 /* sh_entsize */
+        },
+        { /* .strtab */
+            19, /* sh_name */
+            SHT_STRTAB,
+            0, /* sh_flags */
+            0, /* sh_addr */
+            (Elf64_Off)(sizeof(header64)+sizeof(sectionHeaders64)+2*sizeof(Elf64_Sym)+40), /* sh_offset */
+            (Elf64_Xword)sizeof(entry), /* sh_size */
+            0, /* sh_link */
+            0, /* sh_info */
+            1, /* sh_addralign */
+            0 /* sh_entsize */
+        },
+        { /* .rodata */
+            27, /* sh_name */
+            SHT_PROGBITS,
+            SHF_ALLOC, /* sh_flags */
+            0, /* sh_addr */
+            (Elf64_Off)(sizeof(header64)+sizeof(sectionHeaders64)+2*sizeof(Elf64_Sym)+40+sizeof(entry)), /* sh_offset */
+            0, /* sh_size */
+            0, /* sh_link */
+            0, /* sh_info */
+            16, /* sh_addralign */
+            0 /* sh_entsize */
+        }
+    };
+
+    /*
+     * 64-bit symbol table
+     * careful: different order of items compared with Elf32_sym!
+     */
+    static Elf64_Sym symbols64[2]={
+        { /* STN_UNDEF */
+            0
+        },
+        { /* data entry point */
+            1, /* st_name */
+            ELF64_ST_INFO(STB_GLOBAL, STT_OBJECT),
+            0, /* st_other */
+            4, /* st_shndx=index of related section table entry */
+            0, /* st_value */
+            0 /* st_size */
+        }
+    };
+
+#endif /* U_ELF64 */
+
+    /* entry[] have a leading NUL */
+    entryOffset=1;
+
+    /* in the common code, count entryLength from after the NUL */
+    entryLengthOffset=1;
+
+    newSuffix=".o";
+
+#elif defined(U_WINDOWS)
+    struct {
+        IMAGE_FILE_HEADER fileHeader;
+        IMAGE_SECTION_HEADER sections[2];
+        char linkerOptions[100];
+    } objHeader;
+    IMAGE_SYMBOL symbols[1];
+    struct {
+        DWORD sizeofLongNames;
+        char longNames[100];
+    } symbolNames;
+
+    /*
+     * entry sometimes have a leading '_'
+     * overwritten if entryOffset==0 depending on the target platform
+     * see check for cpu below
+     */
+    entry[0]='_';
+
+    newSuffix=".obj";
+#else
+#   error "Unknown platform for CAN_GENERATE_OBJECTS."
+#endif
+
+    /* deal with options, files and the entry point name */
+    getArchitecture(&cpu, &bits, &makeBigEndian, optMatchArch);
+    printf("genccode: --match-arch cpu=%hu bits=%hu big-endian=%hu\n", cpu, bits, makeBigEndian);
+#ifdef U_WINDOWS
+    if(cpu==IMAGE_FILE_MACHINE_I386) {
+        entryOffset=1;
+    }
+#endif
+
+    in=T_FileStream_open(filename, "rb");
+    if(in==NULL) {
+        fprintf(stderr, "genccode: unable to open input file %s\n", filename);
+        exit(U_FILE_ACCESS_ERROR);
+    }
+    size=T_FileStream_size(in);
+
+    getOutFilename(filename, destdir, buffer, entry+entryOffset, newSuffix, optFilename);
+    if (outFilePath != NULL) {
+        uprv_strcpy(outFilePath, buffer);
+    }
+
+    if(optEntryPoint != NULL) {
+        uprv_strcpy(entry+entryOffset, optEntryPoint);
+        uprv_strcat(entry+entryOffset, "_dat");
+    }
+    /* turn dashes in the entry name into underscores */
+    entryLength=(int32_t)uprv_strlen(entry+entryLengthOffset);
+    for(i=0; i<entryLength; ++i) {
+        if(entry[entryLengthOffset+i]=='-') {
+            entry[entryLengthOffset+i]='_';
+        }
+    }
+
+    /* open the output file */
+    out=T_FileStream_open(buffer, "wb");
+    if(out==NULL) {
+        fprintf(stderr, "genccode: unable to open output file %s\n", buffer);
+        exit(U_FILE_ACCESS_ERROR);
+    }
+
+#ifdef U_ELF
+    if(bits==32) {
+        header32.e_ident[EI_DATA]= makeBigEndian ? ELFDATA2MSB : ELFDATA2LSB;
+        header32.e_machine=cpu;
+
+        /* 16-align .rodata in the .o file, just in case */
+        paddingSize=sectionHeaders32[4].sh_offset & 0xf;
+        if(paddingSize!=0) {
+                paddingSize=0x10-paddingSize;
+                sectionHeaders32[4].sh_offset+=paddingSize;
+        }
+
+        sectionHeaders32[4].sh_size=(Elf32_Word)size;
+
+        symbols32[1].st_size=(Elf32_Word)size;
+
+        /* write .o headers */
+        T_FileStream_write(out, &header32, (int32_t)sizeof(header32));
+        T_FileStream_write(out, sectionHeaders32, (int32_t)sizeof(sectionHeaders32));
+        T_FileStream_write(out, symbols32, (int32_t)sizeof(symbols32));
+    } else /* bits==64 */ {
+#ifdef U_ELF64
+        header64.e_ident[EI_DATA]= makeBigEndian ? ELFDATA2MSB : ELFDATA2LSB;
+        header64.e_machine=cpu;
+
+        /* 16-align .rodata in the .o file, just in case */
+        paddingSize=sectionHeaders64[4].sh_offset & 0xf;
+        if(paddingSize!=0) {
+                paddingSize=0x10-paddingSize;
+                sectionHeaders64[4].sh_offset+=paddingSize;
+        }
+
+        sectionHeaders64[4].sh_size=(Elf64_Xword)size;
+
+        symbols64[1].st_size=(Elf64_Xword)size;
+
+        /* write .o headers */
+        T_FileStream_write(out, &header64, (int32_t)sizeof(header64));
+        T_FileStream_write(out, sectionHeaders64, (int32_t)sizeof(sectionHeaders64));
+        T_FileStream_write(out, symbols64, (int32_t)sizeof(symbols64));
+#endif
+    }
+
+    T_FileStream_write(out, sectionStrings, (int32_t)sizeof(sectionStrings));
+    T_FileStream_write(out, entry, (int32_t)sizeof(entry));
+    if(paddingSize!=0) {
+        T_FileStream_write(out, padding, paddingSize);
+    }
+#elif defined(U_WINDOWS)
+    /* populate the .obj headers */
+    uprv_memset(&objHeader, 0, sizeof(objHeader));
+    uprv_memset(&symbols, 0, sizeof(symbols));
+    uprv_memset(&symbolNames, 0, sizeof(symbolNames));
+
+    /* write the linker export directive */
+    uprv_strcpy(objHeader.linkerOptions, "-export:");
+    length=8;
+    uprv_strcpy(objHeader.linkerOptions+length, entry);
+    length+=entryLength;
+    uprv_strcpy(objHeader.linkerOptions+length, ",data ");
+    length+=6;
+
+    /* set the file header */
+    objHeader.fileHeader.Machine=cpu;
+    objHeader.fileHeader.NumberOfSections=2;
+    objHeader.fileHeader.TimeDateStamp=(DWORD)time(NULL);
+    objHeader.fileHeader.PointerToSymbolTable=IMAGE_SIZEOF_FILE_HEADER+2*IMAGE_SIZEOF_SECTION_HEADER+length+size; /* start of symbol table */
+    objHeader.fileHeader.NumberOfSymbols=1;
+
+    /* set the section for the linker options */
+    uprv_strncpy((char *)objHeader.sections[0].Name, ".drectve", 8);
+    objHeader.sections[0].SizeOfRawData=length;
+    objHeader.sections[0].PointerToRawData=IMAGE_SIZEOF_FILE_HEADER+2*IMAGE_SIZEOF_SECTION_HEADER;
+    objHeader.sections[0].Characteristics=IMAGE_SCN_LNK_INFO|IMAGE_SCN_LNK_REMOVE|IMAGE_SCN_ALIGN_1BYTES;
+
+    /* set the data section */
+    uprv_strncpy((char *)objHeader.sections[1].Name, ".rdata", 6);
+    objHeader.sections[1].SizeOfRawData=size;
+    objHeader.sections[1].PointerToRawData=IMAGE_SIZEOF_FILE_HEADER+2*IMAGE_SIZEOF_SECTION_HEADER+length;
+    objHeader.sections[1].Characteristics=IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_ALIGN_16BYTES|IMAGE_SCN_MEM_READ;
+
+    /* set the symbol table */
+    if(entryLength<=8) {
+        uprv_strncpy((char *)symbols[0].N.ShortName, entry, entryLength);
+        symbolNames.sizeofLongNames=4;
+    } else {
+        symbols[0].N.Name.Short=0;
+        symbols[0].N.Name.Long=4;
+        symbolNames.sizeofLongNames=4+entryLength+1;
+        uprv_strcpy(symbolNames.longNames, entry);
+    }
+    symbols[0].SectionNumber=2;
+    symbols[0].StorageClass=IMAGE_SYM_CLASS_EXTERNAL;
+
+    /* write the file header and the linker options section */
+    T_FileStream_write(out, &objHeader, objHeader.sections[1].PointerToRawData);
+#else
+#   error "Unknown platform for CAN_GENERATE_OBJECTS."
+#endif
+
+    /* copy the data file into section 2 */
+    for(;;) {
+        length=T_FileStream_read(in, buffer, sizeof(buffer));
+        if(length==0) {
+            break;
+        }
+        T_FileStream_write(out, buffer, (int32_t)length);
+    }
+
+#ifdef U_WINDOWS
+    /* write the symbol table */
+    T_FileStream_write(out, symbols, IMAGE_SIZEOF_SYMBOL);
+    T_FileStream_write(out, &symbolNames, symbolNames.sizeofLongNames);
+#endif
+
+    if(T_FileStream_error(in)) {
+        fprintf(stderr, "genccode: file read error while generating from file %s\n", filename);
+        exit(U_FILE_ACCESS_ERROR);
+    }
+
+    if(T_FileStream_error(out)) {
+        fprintf(stderr, "genccode: file write error while generating from file %s\n", filename);
+        exit(U_FILE_ACCESS_ERROR);
+    }
+
+    T_FileStream_close(out);
+    T_FileStream_close(in);
+}
+#endif