truffle: src/cpu/x86/vm/templateInterpreter_x86

comparison src/cpu/x86/vm/templateInterpreter_x86_32.cpp @ 3284:286c498ae0d4

Merge

author	kvn
date	Fri, 29 Apr 2011 11:15:30 -0700
parents	92add02409c9
children	3d2ab563047a

comparison

equal deleted inserted replaced

-:01fd6090fdd8
+:286c498ae0d4
 }
 return NULL;
 }
+// Method entry for java.lang.ref.Reference.get.
+address InterpreterGenerator::generate_Reference_get_entry(void) {
+#ifndef SERIALGC
+// Code: _aload_0, _getfield, _areturn
+// parameter size = 1
+//
+// The code that gets generated by this routine is split into 2 parts:
+//    1. The "intrinsified" code for G1 (or any SATB based GC),
+//    2. The slow path - which is an expansion of the regular method entry.
+//
+// Notes:-
+// * In the G1 code we do not check whether we need to block for
+//   a safepoint. If G1 is enabled then we must execute the specialized
+//   code for Reference.get (except when the Reference object is null)
+//   so that we can log the value in the referent field with an SATB
+//   update buffer.
+//   If the code for the getfield template is modified so that the
+//   G1 pre-barrier code is executed when the current method is
+//   Reference.get() then going through the normal method entry
+//   will be fine.
+// * The G1 code below can, however, check the receiver object (the instance
+//   of java.lang.Reference) and jump to the slow path if null. If the
+//   Reference object is null then we obviously cannot fetch the referent
+//   and so we don't need to call the G1 pre-barrier. Thus we can use the
+//   regular method entry code to generate the NPE.
+//
+// This code is based on generate_accessor_enty.
+// rbx,: methodOop
+// rcx: receiver (preserve for slow entry into asm interpreter)
+// rsi: senderSP must preserved for slow path, set SP to it on fast path
+address entry = __ pc();
+const int referent_offset = java_lang_ref_Reference::referent_offset;
+guarantee(referent_offset > 0, "referent offset not initialized");
+if (UseG1GC) {
+Label slow_path;
+// Check if local 0 != NULL
+// If the receiver is null then it is OK to jump to the slow path.
+__ movptr(rax, Address(rsp, wordSize));
+__ testptr(rax, rax);
+__ jcc(Assembler::zero, slow_path);
+// rax: local 0 (must be preserved across the G1 barrier call)
+//
+// rbx: method (at this point it's scratch)
+// rcx: receiver (at this point it's scratch)
+// rdx: scratch
+// rdi: scratch
+//
+// rsi: sender sp
+// Preserve the sender sp in case the pre-barrier
+// calls the runtime
+__ push(rsi);
+// Load the value of the referent field.
+const Address field_address(rax, referent_offset);
+__ movptr(rax, field_address);
+// Generate the G1 pre-barrier code to log the value of
+// the referent field in an SATB buffer.
+__ get_thread(rcx);
+__ g1_write_barrier_pre(noreg /* obj */,
+rax /* pre_val */,
+rcx /* thread */,
+rbx /* tmp */,
+true /* tosca_save */,
+true /* expand_call */);
+// _areturn
+__ pop(rsi);                // get sender sp
+__ pop(rdi);                // get return address
+__ mov(rsp, rsi);           // set sp to sender sp
+__ jmp(rdi);
+__ bind(slow_path);
+(void) generate_normal_entry(false);
+return entry;
+}
+#endif // SERIALGC
+// If G1 is not enabled then attempt to go through the accessor entry point
+// Reference.get is an accessor
+return generate_accessor_entry();
+}
 //
 // Interpreter stub for calling a native method. (asm interpreter)
 // This sets up a somewhat different looking stack for calling the native method
 // than the typical interpreter frame setup.
 //
 case Interpreter::java_lang_math_tan     : // fall thru
 case Interpreter::java_lang_math_abs     : // fall thru
 case Interpreter::java_lang_math_log     : // fall thru
 case Interpreter::java_lang_math_log10   : // fall thru
 case Interpreter::java_lang_math_sqrt    : entry_point = ((InterpreterGenerator*)this)->generate_math_entry(kind);     break;
+case Interpreter::java_lang_ref_reference_get
+: entry_point = ((InterpreterGenerator*)this)->generate_Reference_get_entry(); break;
 default                                  : ShouldNotReachHere();                                                       break;
 }
 if (entry_point) return entry_point;

Mercurial > hg > truffle

comparison src/cpu/x86/vm/templateInterpreter_x86_32.cpp @ 3284:286c498ae0d4