Bump the C stack pointer when building Dart frames to maintain the ARM64 ABI requirements without g…

runtime/vm/intermediate_language_arm64.cc

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/compiler.h"
@@ skipping 2631 matching lines @@
   CheckStackOverflowInstr* instruction_;
   Label osr_entry_label_;
 };
 
 
 void CheckStackOverflowInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   CheckStackOverflowSlowPath* slow_path = new CheckStackOverflowSlowPath(this);
   compiler->AddSlowPathCode(slow_path);
 
   __ ldr(TMP, Address(THR, Thread::stack_limit_offset()));
-  __ CompareRegisters(SP, TMP);
+  // Compare to CSP not SP because CSP is closer to the stack limit. See
+  // Assembler::EnterFrame.
+  __ CompareRegisters(CSP, TMP);
   __ b(slow_path->entry_label(), LS);
   if (compiler->CanOSRFunction() && in_loop()) {
     const Register temp = locs()->temp(0).reg();
     // In unoptimized code check the usage counter to trigger OSR at loop
     // stack checks.  Use progressively higher thresholds for more deeply
     // nested loops to attempt to hit outer loops with OSR when possible.
     __ LoadObject(temp, compiler->parsed_function().function());
     intptr_t threshold =
         FLAG_optimization_counter_threshold * (loop_depth() + 1);
     __ LoadFieldFromOffset(
@@ skipping 3052 matching lines @@
                                 1,
                                 locs());
   __ Drop(1);
   __ Pop(result);
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64