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hotspot/src/share/vm/opto/c2compiler.cpp

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+/*
+ * Copyright 1999-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_c2compiler.cpp.incl"
+
+
+volatile int C2Compiler::_runtimes = uninitialized;
+
+// register information defined by ADLC
+extern const char register_save_policy[];
+extern const int  register_save_type[];
+
+const char* C2Compiler::retry_no_subsuming_loads() {
+  return "retry without subsuming loads";
+}
+void C2Compiler::initialize_runtime() {
+
+  // Check assumptions used while running ADLC
+  Compile::adlc_verification();
+  assert(REG_COUNT <= ConcreteRegisterImpl::number_of_registers, "incompatible register counts");
+
+  for (int i = 0; i < ConcreteRegisterImpl::number_of_registers ; i++ ) {
+      OptoReg::vm2opto[i] = OptoReg::Bad;
+  }
+
+  for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(REG_COUNT); i = OptoReg::add(i,1) ) {
+    VMReg r = OptoReg::as_VMReg(i);
+    if (r->is_valid()) {
+      OptoReg::vm2opto[r->value()] = i;
+    }
+  }
+
+  // Check that runtime and architecture description agree on callee-saved-floats
+  bool callee_saved_floats = false;
+  for( OptoReg::Name i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) {
+    // Is there a callee-saved float or double?
+    if( register_save_policy[i] == 'E' /* callee-saved */ &&
+       (register_save_type[i] == Op_RegF || register_save_type[i] == Op_RegD) ) {
+      callee_saved_floats = true;
+    }
+  }
+
+  DEBUG_ONLY( Node::init_NodeProperty(); )
+
+  Compile::pd_compiler2_init();
+
+  CompilerThread* thread = CompilerThread::current();
+
+  HandleMark  handle_mark(thread);
+
+  OptoRuntime::generate(thread->env());
+
+}
+
+
+void C2Compiler::initialize() {
+
+  // This method can only be called once per C2Compiler object
+  // The first compiler thread that gets here will initialize the
+  // small amount of global state (and runtime stubs) that c2 needs.
+
+  // There is a race possible once at startup and then we're fine
+
+  // Note that this is being called from a compiler thread not the
+  // main startup thread.
+
+  if (_runtimes != initialized) {
+    initialize_runtimes( initialize_runtime, &_runtimes);
+  }
+
+  // Mark this compiler object as ready to roll
+  mark_initialized();
+}
+
+void C2Compiler::compile_method(ciEnv* env,
+                                ciMethod* target,
+                                int entry_bci) {
+  if (!is_initialized()) {
+    initialize();
+  }
+  bool subsume_loads = true;
+  while (!env->failing()) {
+    // Attempt to compile while subsuming loads into machine instructions.
+    Compile C(env, this, target, entry_bci, subsume_loads);
+
+    // Check result and retry if appropriate.
+    if (C.failure_reason() != NULL) {
+        if (C.failure_reason_is(retry_no_subsuming_loads())) {
+        assert(subsume_loads, "must make progress");
+        subsume_loads = false;
+        continue;  // retry
+      }
+      // Pass any other failure reason up to the ciEnv.
+      // Note that serious, irreversible failures are already logged
+      // on the ciEnv via env->record_method_not_compilable().
+      env->record_failure(C.failure_reason());
+    }
+
+    // No retry; just break the loop.
+    break;
+  }
+}
+
+
+void C2Compiler::print_timers() {
+  // do nothing
+}