java-insns.h (enum java_code): Add op_breakpoint.

* include/java-insns.h (enum java_code): Add op_breakpoint.
        * include/java-interp.h (_Jv_InterpMethod): Declare breakpoint_insn.
        [INTERPRETER]: Declare _Jv_InterpMethod::bp_insn_slot.
        [!INTERPRETER]: Declare _Jv_InterpMethod::bp_insn_opcode.
        (install_break): Declare.
        * interpret.cc (breakpoint_insn): Define breakpoint insn.
        (compile): Add op_breakpoint to "can't happen" cases.
        [INTERPRETER] Initialize breakpoint insn if necessary.
        (install_break): New method.
        * interpret-run.cc: Add op_breakpoint to insn_targets.
        Add insn_breakpoint label.
        * verify.cc (branch_prepass): Add op_breakpoint to unrecognized
        opcodes section of switch statement.
        (verify_instructions_0): Likewise.

From-SVN: r117734

libjava/ChangeLog

@@ -1,3 +1,20 @@
+2006-10-14  Keith Seitz  <keiths@redhat.com>
+
+	* include/java-insns.h (enum java_code): Add op_breakpoint.
+	* include/java-interp.h (_Jv_InterpMethod): Declare breakpoint_insn.
+	[INTERPRETER]: Declare _Jv_InterpMethod::bp_insn_slot.
+	[!INTERPRETER]: Declare _Jv_InterpMethod::bp_insn_opcode.
+	(install_break): Declare.
+	* interpret.cc (breakpoint_insn): Define breakpoint insn.
+	(compile): Add op_breakpoint to "can't happen" cases.
+	[INTERPRETER] Initialize breakpoint insn if necessary.
+	(install_break): New method.
+	* interpret-run.cc: Add op_breakpoint to insn_targets.
+	Add insn_breakpoint label.
+	* verify.cc (branch_prepass): Add op_breakpoint to unrecognized
+	opcodes section of switch statement.
+	(verify_instructions_0): Likewise.
+
 2006-10-12  Keith Seitz  <keiths@redhat.com>
 
 	* include/jvmti-int.h (JVMTI): Declare all members "extern".

libjava/include/java-insns.h

@@ -1,6 +1,6 @@
 // java-insns.h - Instruction encodings. This is -*- c++ -*-
 
-/* Copyright (C) 1999, 2001, 2002  Free Software Foundation
+/* Copyright (C) 1999, 2001, 2002, 2006  Free Software Foundation
 
    This file is part of libgcj.
 
@@ -199,9 +199,7 @@ enum java_opcode
   op_invokespecial = 0xb7,
   op_invokestatic = 0xb8,
   op_invokeinterface = 0xb9,
-
+  op_breakpoint = 0xba,
-  // 0xba is unused.
-
   op_new = 0xbb,
   op_newarray = 0xbc,
   op_anewarray = 0xbd,

libjava/include/java-interp.h

@@ -133,6 +133,14 @@ struct  _Jv_LineTableEntry
 
 class _Jv_InterpMethod : public _Jv_MethodBase
 {
+  // Breakpoint instruction
+  static pc_t breakpoint_insn;
+#ifdef DIRECT_THREADED
+  static insn_slot bp_insn_slot;
+#else
+  static unsigned char bp_insn_opcode;
+#endif
+
   _Jv_ushort       max_stack;
   _Jv_ushort       max_locals;
   int              code_length;
@@ -206,6 +214,10 @@ class _Jv_InterpMethod : public _Jv_MethodBase
   void get_line_table (jlong& start, jlong& end, jintArray& line_numbers,
 		       jlongArray& code_indices);
 
+  /* Installs a break instruction at the given code index. Returns
+     the pc_t of the breakpoint or NULL if index is invalid. */
+  pc_t install_break (jlong index);
+
   // Gets the instruction at the given index
   pc_t get_insn (jlong index);
 

libjava/interpret-run.cc

@@ -217,7 +217,7 @@ details.  */
     INSN_LABEL(invokespecial),
     INSN_LABEL(invokestatic),
     INSN_LABEL(invokeinterface),
-    0, /* Unused.  */
+    INSN_LABEL (breakpoint),
     INSN_LABEL(new),
     INSN_LABEL(newarray),
     INSN_LABEL(anewarray),
@@ -2463,6 +2463,11 @@ details.  */
 
       }
 #endif /* DIRECT_THREADED */
+
+    insn_breakpoint:
+      {
+	// nothing just yet
+      }
     }
   catch (java::lang::Throwable *ex)
     {

libjava/interpret.cc

@@ -75,6 +75,18 @@ _Jv_InitInterpreter()
 void _Jv_InitInterpreter() {}
 #endif
 
+// The breakpoint instruction. For the direct threaded case,
+// _Jv_InterpMethod::compile will initialize breakpoint_insn
+// the first time it is called.
+#ifdef DIRECT_THREADED
+insn_slot _Jv_InterpMethod::bp_insn_slot;
+pc_t _Jv_InterpMethod::breakpoint_insn = NULL;
+#else
+unsigned char _Jv_InterpMethod::bp_insn_opcode
+  = static_cast<unsigned char> (op_breakpoint);
+pc_t _Jv_InterpMethod::breakpoint_insn = &_Jv_InterpMethod::bp_insn_opcode;
+#endif
+
 extern "C" double __ieee754_fmod (double,double);
 
 static inline void dupx (_Jv_word *sp, int n, int x)
@@ -844,6 +856,7 @@ _Jv_InterpMethod::compile (const void * const *insn_targets)
 	    case op_getstatic_4:
 	    case op_getstatic_8:
 	    case op_getstatic_a:
+	    case op_breakpoint:
 	    default:
 	      // Fail somehow.
 	      break;
@@ -879,6 +892,12 @@ _Jv_InterpMethod::compile (const void * const *insn_targets)
     }  
 
   prepared = insns;
+
+  if (breakpoint_insn == NULL)
+    {
+      bp_insn_slot.insn = const_cast<void *> (insn_targets[op_breakpoint]);
+      breakpoint_insn = &bp_insn_slot;
+    }
 }
 #endif /* DIRECT_THREADED */
 
@@ -1384,6 +1403,12 @@ _Jv_InterpMethod::get_line_table (jlong& start, jlong& end,
 #endif // !DIRECT_THREADED
 }
 
+pc_t
+_Jv_InterpMethod::install_break (jlong index)
+{
+  return set_insn (index, breakpoint_insn);
+}
+
 pc_t
 _Jv_InterpMethod::get_insn (jlong index)
 {

libjava/verify.cc

@@ -1,6 +1,6 @@
 // verify.cc - verify bytecode
 
-/* Copyright (C) 2001, 2002, 2003, 2004, 2005  Free Software Foundation
+/* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006  Free Software Foundation
 
    This file is part of libgcj.
 
@@ -1976,6 +1976,7 @@ private:
 	  case op_getstatic_4:
 	  case op_getstatic_8:
 	  case op_getstatic_a:
+	  case op_breakpoint:
 	  default:
 	    verify_fail ("unrecognized instruction in branch_prepass",
 			 start_PC);
@@ -3153,6 +3154,7 @@ private:
 	  case op_getstatic_4:
 	  case op_getstatic_8:
 	  case op_getstatic_a:
+	  case op_breakpoint:
 	  default:
 	    // Unrecognized opcode.
 	    verify_fail ("unrecognized instruction in verify_instructions_0",