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java.c
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java.c
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "java.h"
#include "log.h"
#include "memory.h"
#include "rt.h"
#include "vrf.h"
static int
freeClassfile(ClassFile *);
static int
loadConstantPool(struct BufferIO *, ClassFile *);
static int
loadInterfaces(struct BufferIO *, ClassFile *);
static int
loadFields(struct BufferIO *, ClassFile *);
static int
loadMethods(struct BufferIO *, ClassFile *);
static u1 *
convertAccessFlags_field(u2, u2);
static u1 *
convertAccessFlags_method(u2, u2);
static int
logClassHeader(rt_Class *);
static int
logFields(rt_Class *);
static int
logMethods(rt_Class *);
extern int
parseClassfile(struct BufferIO * input,
struct AttributeFilter *attr_filter)
{
u4 magic;
ClassFile cf;
rt_Class *rtc;
if (!input)
{
logError("Parameter 'input' in function %s is NULL!\r\n", __func__);
return -1;
}
// validate file structure
if (ru4(&magic, input) < 0)
{
logError("IO exception in function %s!\r\n", __func__);
return -1;
}
if (checkMagic(magic) < 0)
return -1;
// initialize ClassFile
memset(&cf, 0, sizeof (ClassFile));
// retrieve version
if (ru2(&(cf.minor_version), input) < 0)
return -1;
if (ru2(&(cf.major_version), input) < 0)
return -1;
#ifndef DEBUG
// check compatibility
if (compareVersion(cf.major_version, cf.minor_version) > 0)
{
logError("Class file version is higher than this implementation!\r\n");
return -1;
}
#endif
if (loadConstantPool(input, &cf) < 0)
return -1;
if (ru2(&(cf.access_flags), input) < 0)
return -1;
if (ru2(&(cf.this_class), input) < 0)
return -1;
if (ru2(&(cf.super_class), input) < 0)
return -1;
if (loadInterfaces(input, &cf) < 0)
return -1;
if (loadFields(input, &cf) < 0)
return -1;
if (loadMethods(input, &cf) < 0)
return -1;
if (loadAttributes_class(&cf, input,
&(cf.attributes_count), &(cf.attributes)) < 0)
return -1;
// constant pool validation
if (validateConstantPool(&cf) < 0)
return -1;
if (validateFields(&cf) < 0)
return -1;
if (validateMethods(&cf) < 0)
return -1;
rtc = new rt_Class(&cf);
//if (linkClass(&cf, rtc) < 0) return -1;
//if (logClassHeader(rtc) < 0) return -1;
//if (logFields(rtc) < 0) return -1;
//if (logMethods(rtc) < 0) return -1;
//if (freeClassfile(&cf) < 0) return -1;
delete rtc;
return 0;
}
static int
freeClassfile(ClassFile *cf)
{
u2 i;
cp_info *cp;
logInfo("Releasing ClassFile memory...\r\n");
if (cf->interfaces)
{
freeMemory(cf->interfaces);
cf->interfaces = (u2 *) 0;
}
if (cf->fields)
{
freeAttributes_field(cf, cf->fields->attributes_count, cf->fields->attributes);
freeMemory(cf->fields);
cf->fields = (field_info *) 0;
}
if (cf->methods)
{
freeAttributes_method(cf, cf->methods->attributes_count, cf->methods->attributes);
freeMemory(cf->methods);
cf->methods = (method_info *) 0;
}
freeAttributes_class(cf, cf->attributes_count, cf->attributes);
// free constant pool at last
if (cf->constant_pool)
{
for (i = 1u; i < cf->constant_pool_count; i++)
{
cp = &(cf->constant_pool[i]);
if (cp->tag == CONSTANT_Utf8)
{
freeMemory(cp->info.cud.bytes);
cp->info.cud.bytes = (u1 *) 0;
}
}
freeMemory(cf->constant_pool);
cf->constant_pool = (cp_info *) 0;
}
return 0;
}
static u1 *
convertAccessFlags_field(u2 i, u2 af)
{
const static int initBufSize = 0x100;
u1 *buf, *out;
int len;
if (!af)
return (u1 *) 0;
if (af & ACC_SYNTHETIC)
return (u1 *) 0;
if (af & ACC_ENUM)
return (u1 *) 0;
if (af & ~ACC_FIELD)
{
logError("Unknown flags [0x%X] detected @ cf->fields[%i]:0x%X!\r\n",
af & ~ACC_FIELD, i, af);
return (u1 *) 0;
}
buf = (u1 *) allocMemory(initBufSize, sizeof (char));
if (!buf)
return (u1 *) 0;
len = 0;
// public, private, protected
if (af & ACC_PUBLIC)
{
memcpy(buf + len, "public", 6);
len += 6;
}
else if (af & ACC_PRIVATE)
{
memcpy(buf + len, "private", 7);
len += 7;
}
else if (af & ACC_PROTECTED)
{
memcpy(buf + len, "protected", 9);
len += 9;
}
// static
if (af & ACC_STATIC)
{
if (len > 0)
memcpy(buf + len++, " ", 1);
memcpy(buf + len, "static", 6);
len += 6;
}
// final, volatile
if (af & ACC_FINAL)
{
if (len > 0)
memcpy(buf + len++, " ", 1);
memcpy(buf + len, "final", 5);
len += 5;
}
else if (af & ACC_VOLATILE)
{
if (len > 0)
memcpy(buf + len++, " ", 1);
memcpy(buf + len, "volatile", 8);
len += 8;
}
if (af & ACC_TRANSIENT)
{
if (len > 0)
memcpy(buf + len++, " ", 1);
memcpy(buf + len, "transient", 9);
len += 9;
}
end:
out = (u1 *) realloc(buf, len + 1);
if (!out)
{
freeMemory(buf);
return buf = (u1 *) 0;
}
out[len] = 0;
return out;
}
static u1 *
convertAccessFlags_method(u2 i, u2 af)
{
const static int initBufSize = 0x100;
u1 *buf, *out;
int len;
if (!af)
return (u1 *) 0;
if (af & ACC_BRIDGE)
return (u1 *) 0;
if (af & ACC_SYNTHETIC)
return (u1 *) 0;
if (af & ~ACC_METHOD)
{
logError("Unknown flags [%X] detected @ cf->methods[%i]!\r\n",
af & ~ACC_METHOD, i);
return (u1 *) 0;
}
buf = (u1 *) malloc(initBufSize);
if (!buf)
{
logError("Fail to allocate memory.\r\n");
return (u1 *) 0;
}
bzero(buf, initBufSize);
len = 0;
// public, private, protected
if (af & ACC_PUBLIC)
{
memcpy(buf + len, "public", 6);
len += 6;
}
else if (af & ACC_PRIVATE)
{
memcpy(buf + len, "private", 7);
len += 7;
}
else if (af & ACC_PROTECTED)
{
memcpy(buf + len, "protected", 9);
len += 9;
}
// final, native, abstract
if (af & ACC_FINAL)
{
if (len > 0)
memcpy(buf + len++, " ", 1);
memcpy(buf + len, "final", 5);
len += 5;
}
else if (af & ACC_NATIVE)
{
if (len > 0)
memcpy(buf + len++, " ", 1);
memcpy(buf + len, "native", 6);
len += 6;
}
else if (af & ACC_ABSTRACT)
{
if (len > 0)
memcpy(buf + len++, " ", 1);
memcpy(buf + len, "abstract", 8);
len += 8;
goto end;
}
// following three tags won't appear with ACC_ABSTRACT
// static
if (af & ACC_STATIC)
{
if (len > 0)
memcpy(buf + len++, " ", 1);
memcpy(buf + len, "static", 6);
len += 6;
}
// synchronized
if (af & ACC_SYNCHRONIZED)
{
if (len > 0)
memcpy(buf + len++, " ", 1);
memcpy(buf + len, "synchronized", 12);
len += 12;
}
// strictfp
if (af & ACC_STRICT)
{
if (len > 0)
memcpy(buf + len++, " ", 1);
memcpy(buf + len, "strictfp", 8);
len += 8;
}
end:
out = (u1 *) realloc(buf, len + 1);
if (!out)
{
free(buf);
return buf = (u1 *) 0;
}
out[len] = 0;
return out;
}
extern const char *
get_cp_name(u1 tag)
{
switch (tag)
{
case CONSTANT_Class:
return "Class\0";
case CONSTANT_Fieldref:
return "Fieldref\0";
case CONSTANT_Methodref:
return "Methodref\0";
case CONSTANT_InterfaceMethodref:
return "InterfaceMethodref\0";
case CONSTANT_String:
return "String\0";
case CONSTANT_Integer:
return "Integer\0";
case CONSTANT_Float:
return "Float\0";
case CONSTANT_Long:
return "Long\0";
case CONSTANT_Double:
return "Double\0";
case CONSTANT_NameAndType:
return "NameAndType\0";
case CONSTANT_Utf8:
return "Utf8\0";
case CONSTANT_MethodHandle:
return "MethodHandle\0";
case CONSTANT_MethodType:
return "MethodType\0";
case CONSTANT_InvokeDynamic:
return "InvokeDynamic\0";
default:
return "Unknown\0";
}
}
extern cp_info *
getConstant(ClassFile *cf, u2 index)
{
if (index > 0 && index < cf->constant_pool_count)
return &(cf->constant_pool[index]);
return (cp_info *) 0;
}
extern const_Utf8_data *
getConstant_Utf8(ClassFile *cf, u2 index)
{
cp_info *info;
info = getConstant(cf, index);
if (!info)
{
logError("Constant pool entry #%i is NULL!\r\n", index);
return NULL;
}
if (info->tag != CONSTANT_Utf8)
{
logError("Constant pool entry #%i is not CONSTANT_Utf8_info entry, but CONSTANT_%s_info entry!\r\n", index, get_cp_name(info->tag));
return NULL;
}
return &(info->info.cud);
}
extern const_Class_data *
getConstant_Class(ClassFile *cf, u2 index)
{
cp_info *info;
info = getConstant(cf, index);
if (!info)
{
logError("Constant pool entry #%i is NULL!\r\n", index);
return NULL;
}
if (info->tag != CONSTANT_Class)
{
logInfo("Constant pool entry #%i is not CONSTANT_Class_info entry, but CONSTANT_%s_info entry!\r\n", index, get_cp_name(info->tag));
return NULL;
}
return &(info->info.ccd);
}
extern const_Fieldref_data *
getConstant_Fieldref(ClassFile *cf, u2 index)
{
cp_info *info;
info = getConstant(cf, index);
if (!info)
{
logError("Constant pool entry #%i is NULL!\r\n", index);
return NULL;
}
if (info->tag != CONSTANT_Fieldref)
{
logInfo("Constant pool entry #%i is not CONSTANT_Fieldref_info entry, but CONSTANT_%s_info entry!\r\n", index, get_cp_name(info->tag));
return NULL;
}
return &(info->info.cfd);
}
extern const_Methodref_data *
getConstant_Methodref(ClassFile *cf, u2 index)
{
cp_info *info;
info = getConstant(cf, index);
if (!info)
{
logError("Constant pool entry #%i is NULL!\r\n", index);
return NULL;
}
if (info->tag != CONSTANT_Methodref)
{
logInfo("Constant pool entry #%i is not CONSTANT_Methodref_info entry, but CONSTANT_%s_info entry!\r\n", index, get_cp_name(info->tag));
return NULL;
}
return &(info->info.cfd);
}
extern const_InterfaceMethodref_data *
getConstant_InterfaceMethodref(ClassFile *cf, u2 index)
{
cp_info *info;
info = getConstant(cf, index);
if (!info)
{
logError("Constant pool entry #%i is NULL!\r\n", index);
return NULL;
}
if (info->tag != CONSTANT_InterfaceMethodref)
{
logInfo("Constant pool entry #%i is not CONSTANT_InterfaceMethodref_info entry, but CONSTANT_%s_info entry!\r\n", index, get_cp_name(info->tag));
return NULL;
}
return &(info->info.cfd);
}
extern const_String_data *
getConstant_String(ClassFile *cf, u2 index)
{
cp_info *info;
info = getConstant(cf, index);
if (!info)
{
logError("Constant pool entry #%i is NULL!\r\n", index);
return NULL;
}
if (info->tag != CONSTANT_String)
{
logInfo("Constant pool entry #%i is not CONSTANT_String_info entry, but CONSTANT_%s_info entry!\r\n", index, get_cp_name(info->tag));
return NULL;
}
return &(info->info.csd);
}
extern const_Integer_data *
getConstant_Integer(ClassFile *cf, u2 index)
{
cp_info *info;
info = getConstant(cf, index);
if (!info)
{
logError("Constant pool entry #%i is NULL!\r\n", index);
return NULL;
}
if (info->tag != CONSTANT_Integer)
{
logInfo("Constant pool entry #%i is not CONSTANT_Integer_info entry, but CONSTANT_%s_info entry!\r\n", index, get_cp_name(info->tag));
return NULL;
}
return &(info->info.cid);
}
extern const_Float_data *
getConstant_Float(ClassFile *cf, u2 index)
{
cp_info *info;
info = getConstant(cf, index);
if (!info)
{
logError("Constant pool entry #%i is NULL!\r\n", index);
return NULL;
}
if (info->tag != CONSTANT_Float)
{
logInfo("Constant pool entry #%i is not CONSTANT_Float_info entry, but CONSTANT_%s_info entry!\r\n", index, get_cp_name(info->tag));
return NULL;
}
return &(info->info.cid);
}
extern const_Long_data *
getConstant_Long(ClassFile *cf, u2 index)
{
cp_info *info;
info = getConstant(cf, index);
if (!info)
{
logError("Constant pool entry #%i is NULL!\r\n", index);
return NULL;
}
if (info->tag != CONSTANT_Long)
{
logInfo("Constant pool entry #%i is not CONSTANT_Long_info entry, but CONSTANT_%s_info entry!\r\n", index, get_cp_name(info->tag));
return NULL;
}
return &(info->info.cld);
}
extern const_Double_data *
getConstant_Double(ClassFile *cf, u2 index)
{
cp_info *info;
info = getConstant(cf, index);
if (!info)
{
logError("Constant pool entry #%i is NULL!\r\n", index);
return NULL;
}
if (info->tag != CONSTANT_Double)
{
logInfo("Constant pool entry #%i is not CONSTANT_Double_info entry, but CONSTANT_%s_info entry!\r\n", index, get_cp_name(info->tag));
return NULL;
}
return &(info->info.cld);
}
extern const_NameAndType_data *
getConstant_NameAndType(ClassFile *cf, u2 index)
{
cp_info *info;
info = getConstant(cf, index);
if (!info)
{
logError("Constant pool entry #%i is NULL!\r\n", index);
return NULL;
}
if (info->tag != CONSTANT_NameAndType)
{
logInfo("Constant pool entry #%i is not CONSTANT_NameAndType_info entry, but CONSTANT_%s_info entry!\r\n", index, get_cp_name(info->tag));
return NULL;
}
return &(info->info.cnd);
}
extern const_MethodHandle_data *
getConstant_MethodHandle(ClassFile *cf, u2 index)
{
cp_info *info;
info = getConstant(cf, index);
if (!info)
{
logError("Constant pool entry #%i is NULL!\r\n", index);
return NULL;
}
if (info->tag != CONSTANT_MethodHandle)
{
logInfo("Constant pool entry #%i is not CONSTANT_MethodHandle_info entry, but CONSTANT_%s_info entry!\r\n", index, get_cp_name(info->tag));
return NULL;
}
return &(info->info.cmhd);
}
extern const_MethodType_data *
getConstant_MethodType(ClassFile *cf, u2 index)
{
cp_info *info;
info = getConstant(cf, index);
if (!info)
{
logError("Constant pool entry #%i is NULL!\r\n", index);
return NULL;
}
if (info->tag != CONSTANT_MethodType)
{
logInfo("Constant pool entry #%i is not CONSTANT_MethodType_info entry, but CONSTANT_%s_info entry!\r\n", index, get_cp_name(info->tag));
return NULL;
}
return &(info->info.cmtd);
}
extern const_InvokeDynamic_data *
getConstant_InvokeDynamic(ClassFile *cf, u2 index)
{
cp_info *info;
info = getConstant(cf, index);
if (!info)
{
logError("Constant pool entry #%i is NULL!\r\n", index);
return NULL;
}
if (info->tag != CONSTANT_InvokeDynamic)
{
logInfo("Constant pool entry #%i is not CONSTANT_InvokeDynamic_info entry, but CONSTANT_%s_info entry!\r\n", index, get_cp_name(info->tag));
return NULL;
}
return &(info->info.cidd);
}
/*
* Return:
* * 1 When major.minor > major1.minor1
* * 0 When major.minor == major1.minor1
* * -1 When major.minor < major1.minor1
*/
extern int
compareVersion0(u2 major_version,
u2 minor_version,
u2 major_version1,
u2 minor_version1)
{
u4 version, version1;
version = major_version << 8 | minor_version;
version1 = major_version1 << 8 | minor_version;
version -= version1;
return (int) version;
}
extern int
compareVersion(u2 major_version, u2 minor_version)
{
return compareVersion0(major_version, minor_version,
MAJOR_VERSION, MINOR_VERSION);
}
extern int isFieldDescriptor(u2 len, u1 *str)
{
u2 i;
if (len == 1)
{
switch (str[0])
{
case 'B':case 'C':
case 'D':case 'F':
case 'I':case 'J':
case 'S':case 'Z':
return 1;
default:
return 0;
}
}
if (str[0] == '[')
return isFieldDescriptor(len - 1, str + 1);
else if (str[0] == 'L' && str[len - 1] == ';')
{
for (i = 1; i < len - 1; i++)
if (str[i] != '/' && str[i] != '$'
&& (str[i] < 'a' || str[i] > 'z')
&& (str[i] < 'A' || str[i] > 'Z')
&& (str[i] < '0' || str[i] > '9'))
return 0;
return 1;
}
return 0;
}
static int
getConstantLength(u1 tag)
{
switch (tag)
{
case CONSTANT_Class:
return sizeof (const_Class_data);
case CONSTANT_Fieldref:
case CONSTANT_Methodref:
case CONSTANT_InterfaceMethodref:
return sizeof (const_Fieldref_data);
case CONSTANT_String:
return sizeof (const_String_data);
case CONSTANT_Integer:
case CONSTANT_Float:
return sizeof (const_Integer_data);
case CONSTANT_Long:
case CONSTANT_Double:
return sizeof (const_Long_data);
case CONSTANT_NameAndType:
return sizeof (const_NameAndType_data);
case CONSTANT_Utf8:
return sizeof (const_Utf8_data);
case CONSTANT_MethodHandle:
return sizeof (const_MethodHandle_data);
case CONSTANT_MethodType:
return sizeof (const_MethodType_data);
case CONSTANT_InvokeDynamic:
return sizeof (const_InvokeDynamic_data);
}
return 0;
}
static int
loadConstant(struct BufferIO *input, cp_info *info)
{
u1 tag;
int length;
u2 len;
u1 * str;
if (ru1(&tag, input) < 0) return -1;
if (tag == CONSTANT_Utf8)
{
if (ru2(&len, input) < 0) return -1;
str = (u1 *) allocMemory(sizeof (u1), len);
if (!str) return -1;
if (rbs(str, input, len) < 0) return -1;
info->info.cud.length = len;
info->info.cud.bytes = str;
}
else
{
length = getConstantLength(tag);
if (rbs((u1 *) &(info->info), input, length) < 0) return -1;
}
info->tag = tag;
return length;
}
static int
loadConstantPool(struct BufferIO *input, ClassFile *cf)
{
u2 i;
cp_info * info;
// retrieve constant pool size
if (ru2(&(cf->constant_pool_count), input) < 0)
{
logError("IO exception in function %s!\r\n", __func__);
return -1;
}
if (cf->constant_pool_count > 0)
{
cf->constant_pool = (cp_info *) allocMemory(cf->constant_pool_count, sizeof (cp_info));
if (!cf->constant_pool) return -1;
// jvms7 says "The constant_pool table is indexed
// from 1 to constant_pool_count - 1
for (i = 1u; i < cf->constant_pool_count; i++)
{ // LOOP
info = &(cf->constant_pool[i]);
if (loadConstant(input, info) < 0) return -1;
} // LOOP
}
return 0;
}
static int
loadInterfaces(struct BufferIO *input, ClassFile *cf)
{
u2 i;
if (ru2(&(cf->interfaces_count), input) < 0)
{
logError("IO exception in function %s!\r\n", __func__);
return -1;
}
if (cf->interfaces_count > 0)
{
cf->interfaces = (u2 *) allocMemory(cf->interfaces_count, sizeof (u2));
if (!cf->interfaces) return -1;
for (i = 0u; i < cf->interfaces_count; i++)
{
if (ru2(&(cf->interfaces[i]), input) < 0)
{
logError("IO exception in function %s!\r\n", __func__);
return -1;
}
}
}
return 0;
}
static int
loadFields(struct BufferIO *input, ClassFile *cf)
{
u2 i;
if (ru2(&(cf->fields_count), input) < 0)
{
logError("IO exception in function %s!\r\n", __func__);
return -1;
}
if (cf->fields_count > 0)
{
cf->fields = (field_info *) allocMemory(cf->fields_count, sizeof (field_info));
if (!cf->fields) return -1;
for (i = 0u; i < cf->fields_count; i++)
{
if (ru2(&(cf->fields[i].access_flags), input) < 0)
{
logError("IO exception in function %s!\r\n", __func__);
return -1;
}
if (ru2(&(cf->fields[i].name_index), input) < 0)
{
logError("IO exception in function %s!\r\n", __func__);
return -1;
}
if (ru2(&(cf->fields[i].descriptor_index), input) < 0)
{
logError("IO exception in function %s!\r\n", __func__);
return -1;
}
loadAttributes_field(cf, input, &(cf->fields[i]),
&(cf->fields[i].attributes_count), &(cf->fields[i].attributes));
}
}
return 0;
}
static int
loadMethods(struct BufferIO *input, ClassFile *cf)
{
u2 i;
if (ru2(&(cf->methods_count), input) < 0)
{
logError("IO exception in function %s!\r\n", __func__);
return -1;
}
if (cf->methods_count > 0)
{
cf->methods = (method_info *) allocMemory(cf->methods_count, sizeof (method_info));
if (!cf->methods) return -1;
for (i = 0u; i < cf->methods_count; i++)
{
if (ru2(&(cf->methods[i].access_flags), input) < 0)
{
logError("IO exception in function %s!\r\n", __func__);
return -1;
}
if (ru2(&(cf->methods[i].name_index), input) < 0)
{
logError("IO exception in function %s!\r\n", __func__);
return -1;
}
if (ru2(&(cf->methods[i].descriptor_index), input) < 0)
{
logError("IO exception in function %s!\r\n", __func__);
return -1;
}
loadAttributes_method(cf, input, &(cf->methods[i]),
&(cf->methods[i].attributes_count), &(cf->methods[i].attributes));
}
}
return 0;
}
static int
writeClassName0(char *out,
u2 len, u1 *str)
{
size_t n;
u2 i;
n = sprintf(out, "%.*s", len, str);
if (n < 0) return -1;
for (i = 0; i < len; i++)
if (out[i] == '/')
out[i] = '.';
return n;
}
static int
writeClassName(char *out,
rt_Class *rtc,
const_Class_data *class_info)
{
const_Utf8_data *class_name;
u2 class_name_index;
class_name_index = class_info->name_index;
class_name = rtc->getConstant_Utf8(class_name_index);
return writeClassName0(out,
class_name->length,
class_name->bytes);
}
static int
logClassHeader(rt_Class *rtc)
{
#if (defined DEBUG && defined LOG_INFO)
char buf[1024], *ptr;
size_t n, m;
u2 access_flags;
const_Class_data * this_class, * super_class;
u2 interfaces_count;
const_Class_data ** interfaces;
const_Utf8_data *cui;
u2 i;
access_flags = rtc->getAccessFlags();
this_class = rtc->getThisClass();
super_class = rtc->getSuperClass();
interfaces_count = rtc->getInterfacesCount();
interfaces = (const_Class_data **) NULL;
if (!rtc->getInterfaces(interfaces))
goto error;
memset(buf, 0, sizeof (buf));
ptr = (char *) buf;
if (access_flags & ACC_PUBLIC)
{
n = sprintf(ptr, "public ");
if (n < 0) goto error;
ptr += n;
}
if (access_flags & ACC_ABSTRACT)