71 bool is_first_frame() const { return _anchor.last_Java_sp() == NULL; }
72
73 };
74
75
76 // Encapsulates arguments to a JavaCall (faster, safer, and more convenient than using var-args)
77 class JavaCallArguments : public StackObj {
78 private:
79 enum Constants {
80 _default_size = 8 // Must be at least # of arguments in JavaCalls methods
81 };
82
83 intptr_t _value_buffer [_default_size + 1];
84 u_char _value_state_buffer[_default_size + 1];
85
86 intptr_t* _value;
87 u_char* _value_state;
88 int _size;
89 int _max_size;
90 bool _start_at_zero; // Support late setting of receiver
91 JVMCI_ONLY(nmethod* _alternative_target;) // Nmethod that should be called instead of normal target
92
93 void initialize() {
94 // Starts at first element to support set_receiver.
95 _value = &_value_buffer[1];
96 _value_state = &_value_state_buffer[1];
97
98 _max_size = _default_size;
99 _size = 0;
100 _start_at_zero = false;
101 JVMCI_ONLY(_alternative_target = NULL;)
102 }
103
104 // Helper for push_oop and the like. The value argument is a
105 // "handle" that refers to an oop. We record the address of the
106 // handle rather than the designated oop. The handle is later
107 // resolved to the oop by parameters(). This delays the exposure of
108 // naked oops until it is GC-safe.
109 template<typename T>
110 inline int push_oop_impl(T handle, int size) {
111 // JNITypes::put_obj expects an oop value, so we play fast and
112 // loose with the type system. The cast from handle type to oop
113 // *must* use a C-style cast. In a product build it performs a
114 // reinterpret_cast. In a debug build (more accurately, in a
115 // CHECK_UNHANDLED_OOPS build) it performs a static_cast, invoking
116 // the debug-only oop class's conversion from void* constructor.
117 JNITypes::put_obj((oop)handle, _value, size); // Updates size.
118 return size; // Return the updated size.
119 }
120
121 public:
122 JavaCallArguments() { initialize(); }
123
124 JavaCallArguments(Handle receiver) {
125 initialize();
126 push_oop(receiver);
127 }
128
129 JavaCallArguments(int max_size) {
130 if (max_size > _default_size) {
131 _value = NEW_RESOURCE_ARRAY(intptr_t, max_size + 1);
132 _value_state = NEW_RESOURCE_ARRAY(u_char, max_size + 1);
133
134 // Reserve room for potential receiver in value and state
135 _value++;
136 _value_state++;
137
138 _max_size = max_size;
139 _size = 0;
140 _start_at_zero = false;
141 JVMCI_ONLY(_alternative_target = NULL;)
142 } else {
143 initialize();
144 }
145 }
146
147 #if INCLUDE_JVMCI
148 void set_alternative_target(nmethod* target) {
149 _alternative_target = target;
150 }
151
152 nmethod* alternative_target() {
153 return _alternative_target;
154 }
155 #endif
156
157 // The possible values for _value_state elements.
158 enum {
159 value_state_primitive,
160 value_state_oop,
161 value_state_handle,
162 value_state_jobject,
163 value_state_limit
164 };
165
166 inline void push_oop(Handle h) {
167 _value_state[_size] = value_state_handle;
168 _size = push_oop_impl(h.raw_value(), _size);
169 }
170
171 inline void push_jobject(jobject h) {
172 _value_state[_size] = value_state_jobject;
|
71 bool is_first_frame() const { return _anchor.last_Java_sp() == NULL; }
72
73 };
74
75
76 // Encapsulates arguments to a JavaCall (faster, safer, and more convenient than using var-args)
77 class JavaCallArguments : public StackObj {
78 private:
79 enum Constants {
80 _default_size = 8 // Must be at least # of arguments in JavaCalls methods
81 };
82
83 intptr_t _value_buffer [_default_size + 1];
84 u_char _value_state_buffer[_default_size + 1];
85
86 intptr_t* _value;
87 u_char* _value_state;
88 int _size;
89 int _max_size;
90 bool _start_at_zero; // Support late setting of receiver
91 #if INCLUDE_JVMCI
92 Handle _alternative_target; // HotSpotNmethod wrapping an nmethod whose verified entry point
93 // should be called instead of the normal target
94 #endif
95
96 void initialize() {
97 // Starts at first element to support set_receiver.
98 _value = &_value_buffer[1];
99 _value_state = &_value_state_buffer[1];
100
101 _max_size = _default_size;
102 _size = 0;
103 _start_at_zero = false;
104 }
105
106 // Helper for push_oop and the like. The value argument is a
107 // "handle" that refers to an oop. We record the address of the
108 // handle rather than the designated oop. The handle is later
109 // resolved to the oop by parameters(). This delays the exposure of
110 // naked oops until it is GC-safe.
111 template<typename T>
112 inline int push_oop_impl(T handle, int size) {
113 // JNITypes::put_obj expects an oop value, so we play fast and
114 // loose with the type system. The cast from handle type to oop
115 // *must* use a C-style cast. In a product build it performs a
116 // reinterpret_cast. In a debug build (more accurately, in a
117 // CHECK_UNHANDLED_OOPS build) it performs a static_cast, invoking
118 // the debug-only oop class's conversion from void* constructor.
119 JNITypes::put_obj((oop)handle, _value, size); // Updates size.
120 return size; // Return the updated size.
121 }
122
123 public:
124 JavaCallArguments() { initialize(); }
125
126 JavaCallArguments(Handle receiver) {
127 initialize();
128 push_oop(receiver);
129 }
130
131 JavaCallArguments(int max_size) {
132 if (max_size > _default_size) {
133 _value = NEW_RESOURCE_ARRAY(intptr_t, max_size + 1);
134 _value_state = NEW_RESOURCE_ARRAY(u_char, max_size + 1);
135
136 // Reserve room for potential receiver in value and state
137 _value++;
138 _value_state++;
139
140 _max_size = max_size;
141 _size = 0;
142 _start_at_zero = false;
143 } else {
144 initialize();
145 }
146 }
147
148 #if INCLUDE_JVMCI
149 void set_alternative_target(Handle target) {
150 _alternative_target = target;
151 }
152
153 Handle alternative_target() {
154 return _alternative_target;
155 }
156 #endif
157
158 // The possible values for _value_state elements.
159 enum {
160 value_state_primitive,
161 value_state_oop,
162 value_state_handle,
163 value_state_jobject,
164 value_state_limit
165 };
166
167 inline void push_oop(Handle h) {
168 _value_state[_size] = value_state_handle;
169 _size = push_oop_impl(h.raw_value(), _size);
170 }
171
172 inline void push_jobject(jobject h) {
173 _value_state[_size] = value_state_jobject;
|