Implements OSR for arm and mips.

runtime/vm/assembler_arm.cc

 // Copyright (c) 2013, 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"
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/assembler.h"
 #include "vm/simulator.h"
 #include "vm/runtime_entry.h"
+#include "vm/stack_frame.h"
 #include "vm/stub_code.h"
 
 // An extra check since we are assuming the existence of /proc/cpuinfo below.
 #if !defined(USING_SIMULATOR) && !defined(__linux__)
 #error ARM cross-compile only supported on Linux
 #endif
 
 namespace dart {
 
 DEFINE_FLAG(bool, print_stop_message, true, "Print stop message.");
@@ skipping 2018 matching lines @@
 }
 
 
 void Assembler::CallRuntime(const RuntimeEntry& entry) {
   entry.Call(this);
 }
 
 
 void Assembler::EnterDartFrame(intptr_t frame_size) {
   const intptr_t offset = CodeSize();
+
   // Save PC in frame for fast identification of corresponding code.
   // Note that callee-saved registers can be added to the register list.
   EnterFrame((1 << PP) | (1 << FP) | (1 << LR) | (1 << PC), 0);
 
   if (offset != 0) {
     // Adjust saved PC for any intrinsic code that could have been generated
     // before a frame is created. Use PP as temp register.
     ldr(PP, Address(FP, 2 * kWordSize));
     AddImmediate(PP, PP, -offset);
     str(PP, Address(FP, 2 * kWordSize));
   }
 
   // Setup pool pointer for this dart function.
   LoadPoolPointer();
 
   // Reserve space for locals.
   AddImmediate(SP, -frame_size);
 }
 
 
+// On entry to a function compiled for OSR, the caller's frame pointer, the
+// stack locals, and any copied parameters are already in place.  The frame
+// pointer is already set up.  The PC marker is not correct for the
+// optimized function and there may be extra space for spill slots to
+// allocate. We must also set up the pool pointer for the function.
+void Assembler::EnterOsrFrame(intptr_t extra_size) {
+  const intptr_t offset = CodeSize();
+
+  Comment("EnterOsrFrame");
+  mov(TMP, ShifterOperand(PC));
+
+  AddImmediate(TMP, -offset);
+  str(TMP, Address(FP, kPcMarkerSlotFromFp * kWordSize));
+
+  // Setup pool pointer for this dart function.
+  LoadPoolPointer();
+
+  AddImmediate(SP, -extra_size);
+}
+
+
 void Assembler::LeaveDartFrame() {
   LeaveFrame((1 << PP) | (1 << FP) | (1 << LR));
   // Adjust SP for PC pushed in EnterDartFrame.
   AddImmediate(SP, kWordSize);
 }
 
 
 void Assembler::EnterStubFrame(bool uses_pp) {
   // Push 0 as saved PC for stub frames.
   mov(IP, ShifterOperand(LR));
@@ skipping 156 matching lines @@
 
 const char* Assembler::FpuRegisterName(FpuRegister reg) {
   ASSERT((0 <= reg) && (reg < kNumberOfFpuRegisters));
   return fpu_reg_names[reg];
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM