27 #include "classfile/symbolTable.hpp"
  28 #include "memory/resourceArea.hpp"
  29 
  30 // This function is similar to javaClasses.cpp, it computes the field offset of a (static or instance) field.
  31 // It looks up the name and signature symbols without creating new ones, all the symbols of these classes need to be already loaded.
  32 
  33 void compute_offset(int &dest_offset, Klass* klass, const char* name, const char* signature, bool static_field, TRAPS) {
  34   InstanceKlass* ik = InstanceKlass::cast(klass);
  35   Symbol* name_symbol = SymbolTable::probe(name, (int)strlen(name));
  36   Symbol* signature_symbol = SymbolTable::probe(signature, (int)strlen(signature));
  37   if (name_symbol == NULL || signature_symbol == NULL) {
  38 #ifndef PRODUCT
  39     ik->print_on(tty);
  40 #endif
  41     fatal("symbol with name %s and signature %s was not found in symbol table (klass=%s)", name, signature, klass->name()->as_C_string());
  42   }
  43 
  44   fieldDescriptor fd;
  45   if (!ik->find_field(name_symbol, signature_symbol, &fd)) {
  46     ResourceMark rm;
  47     fatal("Invalid layout of %s at %s", name_symbol->as_C_string(), ik->external_name());
  48   }
  49   guarantee(fd.is_static() == static_field, "static/instance mismatch");
  50   dest_offset = fd.offset();
  51   assert(dest_offset != 0, "must be valid offset");
  52   if (static_field) {
  53     // Must ensure classes for static fields are initialized as the
  54     // accessor itself does not include a class initialization check.
  55     ik->initialize(CHECK);
  56   }
  57 }
  58 
  59 // This piece of macro magic creates the contents of the jvmci_compute_offsets method that initializes the field indices of all the access classes.
  60 
  61 #define START_CLASS(name) { Klass* k = SystemDictionary::name##_klass(); assert(k != NULL, "Could not find class " #name "");
  62 
  63 #define END_CLASS }
  64 
  65 #define FIELD(klass, name, signature, static_field) compute_offset(klass::_##name##_offset, k, #name, signature, static_field, CHECK);
  66 #define CHAR_FIELD(klass, name) FIELD(klass, name, "C", false)
  67 #define INT_FIELD(klass, name) FIELD(klass, name, "I", false)

  27 #include "classfile/symbolTable.hpp"
  28 #include "memory/resourceArea.hpp"
  29 
  30 // This function is similar to javaClasses.cpp, it computes the field offset of a (static or instance) field.
  31 // It looks up the name and signature symbols without creating new ones, all the symbols of these classes need to be already loaded.
  32 
  33 void compute_offset(int &dest_offset, Klass* klass, const char* name, const char* signature, bool static_field, TRAPS) {
  34   InstanceKlass* ik = InstanceKlass::cast(klass);
  35   Symbol* name_symbol = SymbolTable::probe(name, (int)strlen(name));
  36   Symbol* signature_symbol = SymbolTable::probe(signature, (int)strlen(signature));
  37   if (name_symbol == NULL || signature_symbol == NULL) {
  38 #ifndef PRODUCT
  39     ik->print_on(tty);
  40 #endif
  41     fatal("symbol with name %s and signature %s was not found in symbol table (klass=%s)", name, signature, klass->name()->as_C_string());
  42   }
  43 
  44   fieldDescriptor fd;
  45   if (!ik->find_field(name_symbol, signature_symbol, &fd)) {
  46     ResourceMark rm;
  47     fatal("Invalid layout of %s %s at %s", name_symbol->as_C_string(), signature_symbol->as_C_string(), ik->external_name());
  48   }
  49   guarantee(fd.is_static() == static_field, "static/instance mismatch");
  50   dest_offset = fd.offset();
  51   assert(dest_offset != 0, "must be valid offset");
  52   if (static_field) {
  53     // Must ensure classes for static fields are initialized as the
  54     // accessor itself does not include a class initialization check.
  55     ik->initialize(CHECK);
  56   }
  57 }
  58 
  59 // This piece of macro magic creates the contents of the jvmci_compute_offsets method that initializes the field indices of all the access classes.
  60 
  61 #define START_CLASS(name) { Klass* k = SystemDictionary::name##_klass(); assert(k != NULL, "Could not find class " #name "");
  62 
  63 #define END_CLASS }
  64 
  65 #define FIELD(klass, name, signature, static_field) compute_offset(klass::_##name##_offset, k, #name, signature, static_field, CHECK);
  66 #define CHAR_FIELD(klass, name) FIELD(klass, name, "C", false)
  67 #define INT_FIELD(klass, name) FIELD(klass, name, "I", false)