# HG changeset patch
# User mdoerr
# Date 1445420405 -7200
# Node ID 36696908d3d37268252aece29d80202b135b8e55
# Parent  daf8acf3afdab4da6795138194cf064ff5910c7e
8138892: C1: Improve counter overflow checking
Reviewed-by: iveresov, goetz, twisti

diff --git a/src/cpu/aarch64/vm/c1_CodeStubs_aarch64.cpp b/src/cpu/aarch64/vm/c1_CodeStubs_aarch64.cpp
--- a/src/cpu/aarch64/vm/c1_CodeStubs_aarch64.cpp
+++ b/src/cpu/aarch64/vm/c1_CodeStubs_aarch64.cpp
@@ -41,7 +41,9 @@
 
 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
   __ bind(_entry);
-  ce->store_parameter(_method->as_register(), 1);
+  Metadata *m = _method->as_constant_ptr()->as_metadata();
+  __ mov_metadata(rscratch1, m);
+  ce->store_parameter(rscratch1, 1);
   ce->store_parameter(_bci, 0);
   __ far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id)));
   ce->add_call_info_here(_info);
diff --git a/src/cpu/sparc/vm/c1_CodeStubs_sparc.cpp b/src/cpu/sparc/vm/c1_CodeStubs_sparc.cpp
--- a/src/cpu/sparc/vm/c1_CodeStubs_sparc.cpp
+++ b/src/cpu/sparc/vm/c1_CodeStubs_sparc.cpp
@@ -94,8 +94,10 @@
 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
   __ bind(_entry);
   __ set(_bci, G4);
+  Metadata *m = _method->as_constant_ptr()->as_metadata();
+  __ set_metadata_constant(m, G5);
   __ call(Runtime1::entry_for(Runtime1::counter_overflow_id), relocInfo::runtime_call_type);
-  __ delayed()->mov_or_nop(_method->as_register(), G5);
+  __ delayed()->nop();
   ce->add_call_info_here(_info);
   ce->verify_oop_map(_info);
 
diff --git a/src/cpu/x86/vm/c1_CodeStubs_x86.cpp b/src/cpu/x86/vm/c1_CodeStubs_x86.cpp
--- a/src/cpu/x86/vm/c1_CodeStubs_x86.cpp
+++ b/src/cpu/x86/vm/c1_CodeStubs_x86.cpp
@@ -81,7 +81,8 @@
 
 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
   __ bind(_entry);
-  ce->store_parameter(_method->as_register(), 1);
+  Metadata *m = _method->as_constant_ptr()->as_metadata();
+  ce->store_parameter(m, 1);
   ce->store_parameter(_bci, 0);
   __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id)));
   ce->add_call_info_here(_info);
diff --git a/src/cpu/x86/vm/c1_LIRAssembler_x86.cpp b/src/cpu/x86/vm/c1_LIRAssembler_x86.cpp
--- a/src/cpu/x86/vm/c1_LIRAssembler_x86.cpp
+++ b/src/cpu/x86/vm/c1_LIRAssembler_x86.cpp
@@ -3054,6 +3054,14 @@
 }
 
 
+void LIR_Assembler::store_parameter(Metadata* m,  int offset_from_rsp_in_words) {
+  assert(offset_from_rsp_in_words >= 0, "invalid offset from rsp");
+  int offset_from_rsp_in_bytes = offset_from_rsp_in_words * BytesPerWord;
+  assert(offset_from_rsp_in_bytes < frame_map()->reserved_argument_area_size(), "invalid offset");
+  __ mov_metadata(Address(rsp, offset_from_rsp_in_bytes), m);
+}
+
+
 // This code replaces a call to arraycopy; no exception may
 // be thrown in this code, they must be thrown in the System.arraycopy
 // activation frame; we could save some checks if this would not be the case
diff --git a/src/cpu/x86/vm/c1_LIRAssembler_x86.hpp b/src/cpu/x86/vm/c1_LIRAssembler_x86.hpp
--- a/src/cpu/x86/vm/c1_LIRAssembler_x86.hpp
+++ b/src/cpu/x86/vm/c1_LIRAssembler_x86.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2015, Oracle and/or its affiliates. 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
@@ -49,9 +49,10 @@
                            Register recv, Label* update_done);
 public:
 
-  void store_parameter(Register r, int offset_from_esp_in_words);
-  void store_parameter(jint c,     int offset_from_esp_in_words);
-  void store_parameter(jobject c,  int offset_from_esp_in_words);
+  void store_parameter(Register r,  int offset_from_esp_in_words);
+  void store_parameter(jint c,      int offset_from_esp_in_words);
+  void store_parameter(jobject c,   int offset_from_esp_in_words);
+  void store_parameter(Metadata* c, int offset_from_esp_in_words);
 
   enum { call_stub_size = NOT_LP64(15) LP64_ONLY(28),
          exception_handler_size = DEBUG_ONLY(1*K) NOT_DEBUG(175),
diff --git a/src/share/vm/c1/c1_LIRGenerator.cpp b/src/share/vm/c1/c1_LIRGenerator.cpp
--- a/src/share/vm/c1/c1_LIRGenerator.cpp
+++ b/src/share/vm/c1/c1_LIRGenerator.cpp
@@ -3418,14 +3418,18 @@
   __ add(result, LIR_OprFact::intConst(InvocationCounter::count_increment), result);
   __ store(result, counter);
   if (notify) {
-    LIR_Opr mask = load_immediate(frequency << InvocationCounter::count_shift, T_INT);
-    LIR_Opr meth = new_register(T_METADATA);
-    __ metadata2reg(method->constant_encoding(), meth);
-    __ logical_and(result, mask, result);
-    __ cmp(lir_cond_equal, result, LIR_OprFact::intConst(0));
+    LIR_Opr meth = LIR_OprFact::metadataConst(method->constant_encoding());
     // The bci for info can point to cmp for if's we want the if bci
     CodeStub* overflow = new CounterOverflowStub(info, bci, meth);
-    __ branch(lir_cond_equal, T_INT, overflow);
+    int freq = frequency << InvocationCounter::count_shift;
+    if (freq == 0) {
+      __ branch(lir_cond_always, T_ILLEGAL, overflow);
+    } else {
+      LIR_Opr mask = load_immediate(freq, T_INT);
+      __ logical_and(result, mask, result);
+      __ cmp(lir_cond_equal, result, LIR_OprFact::intConst(0));
+      __ branch(lir_cond_equal, T_INT, overflow);
+    }
     __ branch_destination(overflow->continuation());
   }
 }