Mercurial > hg > truffle
comparison src/share/vm/runtime/sharedRuntime.cpp @ 1207:74c848d437ab
6921922: fix for 6911204 breaks tagged stack interpreter
Reviewed-by: kvn
author | never |
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date | Wed, 03 Feb 2010 12:28:30 -0800 |
parents | 5fcfaa1ad96f |
children | 7f8790caccb0 3f5b7efb9642 |
comparison
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1206:87684f1a88b5 | 1207:74c848d437ab |
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1804 // A simple wrapper class around the calling convention information | 1804 // A simple wrapper class around the calling convention information |
1805 // that allows sharing of adapters for the same calling convention. | 1805 // that allows sharing of adapters for the same calling convention. |
1806 class AdapterFingerPrint : public CHeapObj { | 1806 class AdapterFingerPrint : public CHeapObj { |
1807 private: | 1807 private: |
1808 union { | 1808 union { |
1809 signed char _compact[12]; | 1809 int _compact[3]; |
1810 int _compact_int[3]; | 1810 int* _fingerprint; |
1811 intptr_t* _fingerprint; | |
1812 } _value; | 1811 } _value; |
1813 int _length; // A negative length indicates that _value._fingerprint is the array. | 1812 int _length; // A negative length indicates the fingerprint is in the compact form, |
1814 // Otherwise it's in the compact form. | 1813 // Otherwise _value._fingerprint is the array. |
1814 | |
1815 // Remap BasicTypes that are handled equivalently by the adapters. | |
1816 // These are correct for the current system but someday it might be | |
1817 // necessary to make this mapping platform dependent. | |
1818 static BasicType adapter_encoding(BasicType in) { | |
1819 assert((~0xf & in) == 0, "must fit in 4 bits"); | |
1820 switch(in) { | |
1821 case T_BOOLEAN: | |
1822 case T_BYTE: | |
1823 case T_SHORT: | |
1824 case T_CHAR: | |
1825 // There are all promoted to T_INT in the calling convention | |
1826 return T_INT; | |
1827 | |
1828 case T_OBJECT: | |
1829 case T_ARRAY: | |
1830 if (!TaggedStackInterpreter) { | |
1831 #ifdef _LP64 | |
1832 return T_LONG; | |
1833 #else | |
1834 return T_INT; | |
1835 #endif | |
1836 } | |
1837 return T_OBJECT; | |
1838 | |
1839 case T_INT: | |
1840 case T_LONG: | |
1841 case T_FLOAT: | |
1842 case T_DOUBLE: | |
1843 case T_VOID: | |
1844 return in; | |
1845 | |
1846 default: | |
1847 ShouldNotReachHere(); | |
1848 return T_CONFLICT; | |
1849 } | |
1850 } | |
1815 | 1851 |
1816 public: | 1852 public: |
1817 AdapterFingerPrint(int total_args_passed, VMRegPair* regs) { | 1853 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) { |
1818 assert(sizeof(_value._compact) == sizeof(_value._compact_int), "must match"); | 1854 // The fingerprint is based on the BasicType signature encoded |
1819 _length = total_args_passed * 2; | 1855 // into an array of ints with four entries per int. |
1820 if (_length < (int)sizeof(_value._compact)) { | 1856 int* ptr; |
1821 _value._compact_int[0] = _value._compact_int[1] = _value._compact_int[2] = 0; | 1857 int len = (total_args_passed + 3) >> 2; |
1858 if (len <= (int)(sizeof(_value._compact) / sizeof(int))) { | |
1859 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0; | |
1822 // Storing the signature encoded as signed chars hits about 98% | 1860 // Storing the signature encoded as signed chars hits about 98% |
1823 // of the time. | 1861 // of the time. |
1824 signed char* ptr = _value._compact; | 1862 _length = -len; |
1825 int o = 0; | 1863 ptr = _value._compact; |
1826 for (int i = 0; i < total_args_passed; i++) { | 1864 } else { |
1827 VMRegPair pair = regs[i]; | 1865 _length = len; |
1828 intptr_t v1 = pair.first()->value(); | 1866 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length); |
1829 intptr_t v2 = pair.second()->value(); | 1867 ptr = _value._fingerprint; |
1830 if (v1 == (signed char) v1 && | 1868 } |
1831 v2 == (signed char) v2) { | 1869 |
1832 _value._compact[o++] = v1; | 1870 // Now pack the BasicTypes with 4 per int |
1833 _value._compact[o++] = v2; | 1871 int sig_index = 0; |
1834 } else { | 1872 for (int index = 0; index < len; index++) { |
1835 goto big; | 1873 int value = 0; |
1874 for (int byte = 0; byte < 4; byte++) { | |
1875 if (sig_index < total_args_passed) { | |
1876 value = (value << 4) | adapter_encoding(sig_bt[sig_index++]); | |
1836 } | 1877 } |
1837 } | 1878 } |
1838 _length = -_length; | 1879 ptr[index] = value; |
1839 return; | 1880 } |
1840 } | |
1841 big: | |
1842 _value._fingerprint = NEW_C_HEAP_ARRAY(intptr_t, _length); | |
1843 int o = 0; | |
1844 for (int i = 0; i < total_args_passed; i++) { | |
1845 VMRegPair pair = regs[i]; | |
1846 intptr_t v1 = pair.first()->value(); | |
1847 intptr_t v2 = pair.second()->value(); | |
1848 _value._fingerprint[o++] = v1; | |
1849 _value._fingerprint[o++] = v2; | |
1850 } | |
1851 } | |
1852 | |
1853 AdapterFingerPrint(AdapterFingerPrint* orig) { | |
1854 _length = orig->_length; | |
1855 _value = orig->_value; | |
1856 // take ownership of any storage by destroying the length | |
1857 orig->_length = 0; | |
1858 } | 1881 } |
1859 | 1882 |
1860 ~AdapterFingerPrint() { | 1883 ~AdapterFingerPrint() { |
1861 if (_length > 0) { | 1884 if (_length > 0) { |
1862 FREE_C_HEAP_ARRAY(int, _value._fingerprint); | 1885 FREE_C_HEAP_ARRAY(int, _value._fingerprint); |
1863 } | 1886 } |
1864 } | 1887 } |
1865 | 1888 |
1866 AdapterFingerPrint* allocate() { | 1889 int value(int index) { |
1867 return new AdapterFingerPrint(this); | |
1868 } | |
1869 | |
1870 intptr_t value(int index) { | |
1871 if (_length < 0) { | 1890 if (_length < 0) { |
1872 return _value._compact[index]; | 1891 return _value._compact[index]; |
1873 } | 1892 } |
1874 return _value._fingerprint[index]; | 1893 return _value._fingerprint[index]; |
1875 } | 1894 } |
1881 bool is_compact() { | 1900 bool is_compact() { |
1882 return _length <= 0; | 1901 return _length <= 0; |
1883 } | 1902 } |
1884 | 1903 |
1885 unsigned int compute_hash() { | 1904 unsigned int compute_hash() { |
1886 intptr_t hash = 0; | 1905 int hash = 0; |
1887 for (int i = 0; i < length(); i++) { | 1906 for (int i = 0; i < length(); i++) { |
1888 intptr_t v = value(i); | 1907 int v = value(i); |
1889 hash = (hash << 8) ^ v ^ (hash >> 5); | 1908 hash = (hash << 8) ^ v ^ (hash >> 5); |
1890 } | 1909 } |
1891 return (unsigned int)hash; | 1910 return (unsigned int)hash; |
1892 } | 1911 } |
1893 | 1912 |
1902 bool equals(AdapterFingerPrint* other) { | 1921 bool equals(AdapterFingerPrint* other) { |
1903 if (other->_length != _length) { | 1922 if (other->_length != _length) { |
1904 return false; | 1923 return false; |
1905 } | 1924 } |
1906 if (_length < 0) { | 1925 if (_length < 0) { |
1907 return _value._compact_int[0] == other->_value._compact_int[0] && | 1926 return _value._compact[0] == other->_value._compact[0] && |
1908 _value._compact_int[1] == other->_value._compact_int[1] && | 1927 _value._compact[1] == other->_value._compact[1] && |
1909 _value._compact_int[2] == other->_value._compact_int[2]; | 1928 _value._compact[2] == other->_value._compact[2]; |
1910 } else { | 1929 } else { |
1911 for (int i = 0; i < _length; i++) { | 1930 for (int i = 0; i < _length; i++) { |
1912 if (_value._fingerprint[i] != other->_value._fingerprint[i]) { | 1931 if (_value._fingerprint[i] != other->_value._fingerprint[i]) { |
1913 return false; | 1932 return false; |
1914 } | 1933 } |
1952 void add(AdapterHandlerEntry* entry) { | 1971 void add(AdapterHandlerEntry* entry) { |
1953 int index = hash_to_index(entry->hash()); | 1972 int index = hash_to_index(entry->hash()); |
1954 add_entry(index, entry); | 1973 add_entry(index, entry); |
1955 } | 1974 } |
1956 | 1975 |
1976 void free_entry(AdapterHandlerEntry* entry) { | |
1977 entry->deallocate(); | |
1978 BasicHashtable::free_entry(entry); | |
1979 } | |
1980 | |
1957 // Find a entry with the same fingerprint if it exists | 1981 // Find a entry with the same fingerprint if it exists |
1958 AdapterHandlerEntry* lookup(int total_args_passed, VMRegPair* regs) { | 1982 AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) { |
1959 debug_only(_lookups++); | 1983 debug_only(_lookups++); |
1960 AdapterFingerPrint fp(total_args_passed, regs); | 1984 AdapterFingerPrint fp(total_args_passed, sig_bt); |
1961 unsigned int hash = fp.compute_hash(); | 1985 unsigned int hash = fp.compute_hash(); |
1962 int index = hash_to_index(hash); | 1986 int index = hash_to_index(hash); |
1963 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) { | 1987 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) { |
1964 debug_only(_buckets++); | 1988 debug_only(_buckets++); |
1965 if (e->hash() == hash) { | 1989 if (e->hash() == hash) { |
2127 if (ss.type() == T_LONG || ss.type() == T_DOUBLE) | 2151 if (ss.type() == T_LONG || ss.type() == T_DOUBLE) |
2128 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots | 2152 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots |
2129 } | 2153 } |
2130 assert(i == total_args_passed, ""); | 2154 assert(i == total_args_passed, ""); |
2131 | 2155 |
2156 // Lookup method signature's fingerprint | |
2157 entry = _adapters->lookup(total_args_passed, sig_bt); | |
2158 | |
2159 #ifdef ASSERT | |
2160 AdapterHandlerEntry* shared_entry = NULL; | |
2161 if (VerifyAdapterSharing && entry != NULL) { | |
2162 shared_entry = entry; | |
2163 entry = NULL; | |
2164 } | |
2165 #endif | |
2166 | |
2167 if (entry != NULL) { | |
2168 return entry; | |
2169 } | |
2170 | |
2132 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage | 2171 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage |
2133 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false); | 2172 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed, false); |
2134 | 2173 |
2135 // Lookup method signature's fingerprint | |
2136 entry = _adapters->lookup(total_args_passed, regs); | |
2137 if (entry != NULL) { | |
2138 return entry; | |
2139 } | |
2140 | |
2141 // Make a C heap allocated version of the fingerprint to store in the adapter | 2174 // Make a C heap allocated version of the fingerprint to store in the adapter |
2142 fingerprint = new AdapterFingerPrint(total_args_passed, regs); | 2175 fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt); |
2143 | 2176 |
2144 // Create I2C & C2I handlers | 2177 // Create I2C & C2I handlers |
2145 | 2178 |
2146 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache | 2179 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache |
2147 if (buf != NULL) { | 2180 if (buf != NULL) { |
2155 total_args_passed, | 2188 total_args_passed, |
2156 comp_args_on_stack, | 2189 comp_args_on_stack, |
2157 sig_bt, | 2190 sig_bt, |
2158 regs, | 2191 regs, |
2159 fingerprint); | 2192 fingerprint); |
2193 | |
2194 #ifdef ASSERT | |
2195 if (VerifyAdapterSharing) { | |
2196 if (shared_entry != NULL) { | |
2197 assert(shared_entry->compare_code(buf->instructions_begin(), buffer.code_size(), total_args_passed, sig_bt), | |
2198 "code must match"); | |
2199 // Release the one just created and return the original | |
2200 _adapters->free_entry(entry); | |
2201 return shared_entry; | |
2202 } else { | |
2203 entry->save_code(buf->instructions_begin(), buffer.code_size(), total_args_passed, sig_bt); | |
2204 } | |
2205 } | |
2206 #endif | |
2160 | 2207 |
2161 B = BufferBlob::create(AdapterHandlerEntry::name, &buffer); | 2208 B = BufferBlob::create(AdapterHandlerEntry::name, &buffer); |
2162 NOT_PRODUCT(code_size = buffer.code_size()); | 2209 NOT_PRODUCT(code_size = buffer.code_size()); |
2163 } | 2210 } |
2164 if (B == NULL) { | 2211 if (B == NULL) { |
2209 ptrdiff_t delta = new_base - _i2c_entry; | 2256 ptrdiff_t delta = new_base - _i2c_entry; |
2210 _i2c_entry += delta; | 2257 _i2c_entry += delta; |
2211 _c2i_entry += delta; | 2258 _c2i_entry += delta; |
2212 _c2i_unverified_entry += delta; | 2259 _c2i_unverified_entry += delta; |
2213 } | 2260 } |
2261 | |
2262 | |
2263 void AdapterHandlerEntry::deallocate() { | |
2264 delete _fingerprint; | |
2265 #ifdef ASSERT | |
2266 if (_saved_code) FREE_C_HEAP_ARRAY(unsigned char, _saved_code); | |
2267 if (_saved_sig) FREE_C_HEAP_ARRAY(Basictype, _saved_sig); | |
2268 #endif | |
2269 } | |
2270 | |
2271 | |
2272 #ifdef ASSERT | |
2273 // Capture the code before relocation so that it can be compared | |
2274 // against other versions. If the code is captured after relocation | |
2275 // then relative instructions won't be equivalent. | |
2276 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length, int total_args_passed, BasicType* sig_bt) { | |
2277 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length); | |
2278 _code_length = length; | |
2279 memcpy(_saved_code, buffer, length); | |
2280 _total_args_passed = total_args_passed; | |
2281 _saved_sig = NEW_C_HEAP_ARRAY(BasicType, _total_args_passed); | |
2282 memcpy(_saved_sig, sig_bt, _total_args_passed * sizeof(BasicType)); | |
2283 } | |
2284 | |
2285 | |
2286 bool AdapterHandlerEntry::compare_code(unsigned char* buffer, int length, int total_args_passed, BasicType* sig_bt) { | |
2287 if (length != _code_length) { | |
2288 return false; | |
2289 } | |
2290 for (int i = 0; i < length; i++) { | |
2291 if (buffer[i] != _saved_code[i]) { | |
2292 return false; | |
2293 } | |
2294 } | |
2295 return true; | |
2296 } | |
2297 #endif | |
2298 | |
2214 | 2299 |
2215 // Create a native wrapper for this native method. The wrapper converts the | 2300 // Create a native wrapper for this native method. The wrapper converts the |
2216 // java compiled calling convention to the native convention, handlizes | 2301 // java compiled calling convention to the native convention, handlizes |
2217 // arguments, and transitions to native. On return from the native we transition | 2302 // arguments, and transitions to native. On return from the native we transition |
2218 // back to java blocking if a safepoint is in progress. | 2303 // back to java blocking if a safepoint is in progress. |