Implement catch on ARM.

runtime/vm/intermediate_language_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"  // Needed here to get TARGET_ARCH_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 66 matching lines @@
 void ReturnInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register result = locs()->in(0).reg();
   ASSERT(result == R0);
 #if defined(DEBUG)
   // TODO(srdjan): Fix for functions with finally clause.
   // A finally clause may leave a previously pushed return value if it
   // has its own return instruction. Method that have finally are currently
   // not optimized.
   if (!compiler->HasFinally()) {
     __ Comment("Stack Check");
-    const int sp_fp_dist = compiler->StackSize() + (-kFirstLocalSlotIndex - 1);
-    __ sub(R2, FP, ShifterOperand(SP));
-    __ CompareImmediate(R2, sp_fp_dist * kWordSize);
+    const intptr_t fp_sp_dist =
+        (kFirstLocalSlotIndex + 1 - compiler->StackSize()) * kWordSize;
+    ASSERT(fp_sp_dist <= 0);
+    __ sub(R2, SP, ShifterOperand(FP));
+    __ CompareImmediate(R2, fp_sp_dist);
     __ bkpt(0, NE);
   }
 #endif
   __ LeaveDartFrame();
   __ Ret();
 
   // Generate 2 NOP instructions so that the debugger can patch the return
   // pattern (1 instruction) with a call to the debug stub (3 instructions).
   __ nop();
   __ nop();
@@ skipping 1384 matching lines @@
   return NULL;
 }
 
 
 void CloneContextInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   UNIMPLEMENTED();
 }
 
 
 LocationSummary* CatchEntryInstr::MakeLocationSummary() const {
-  UNIMPLEMENTED();
-  return NULL;
+  return LocationSummary::Make(0,
+                               Location::NoLocation(),
+                               LocationSummary::kNoCall);
 }
 
 
+// Restore stack and initialize the two exception variables:
+// exception and stack trace variables.
 void CatchEntryInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  UNIMPLEMENTED();
+  // Restore SP from FP as we are coming from a throw and the code for
+  // popping arguments has not been run.
+  const intptr_t fp_sp_dist =
+      (kFirstLocalSlotIndex + 1 - compiler->StackSize()) * kWordSize;
+  ASSERT(fp_sp_dist <= 0);
+  __ AddImmediate(SP, FP, fp_sp_dist);
+
+  ASSERT(!exception_var().is_captured());
+  ASSERT(!stacktrace_var().is_captured());
+  __ StoreToOffset(kStoreWord, kExceptionObjectReg,
+                   FP, exception_var().index() * kWordSize);
+  __ StoreToOffset(kStoreWord, kStackTraceObjectReg,
+                   FP, stacktrace_var().index() * kWordSize);
+
+  // Restore the pool pointer.
+  __ LoadPoolPointer();
 }
 
 
 LocationSummary* CheckStackOverflowInstr::MakeLocationSummary() const {
   const intptr_t kNumInputs = 0;
   const intptr_t kNumTemps = 0;
   LocationSummary* summary =
       new LocationSummary(kNumInputs,
                           kNumTemps,
                           LocationSummary::kCallOnSlowPath);
@@ skipping 533 matching lines @@
 void UnaryMintOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   UNIMPLEMENTED();
 }
 
 
 LocationSummary* ThrowInstr::MakeLocationSummary() const {
   return new LocationSummary(0, 0, LocationSummary::kCall);
 }
 
 
-
 void ThrowInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   compiler->GenerateCallRuntime(token_pos(),
                                 deopt_id(),
                                 kThrowRuntimeEntry,
                                 locs());
   __ bkpt(0);
 }
 
 
 LocationSummary* ReThrowInstr::MakeLocationSummary() const {
-  UNIMPLEMENTED();
-  return NULL;
+  return new LocationSummary(0, 0, LocationSummary::kCall);
 }
 
 
 void ReThrowInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  UNIMPLEMENTED();
+  compiler->GenerateCallRuntime(token_pos(),
+                                deopt_id(),
+                                kReThrowRuntimeEntry,
+                                locs());
+  __ bkpt(0);
 }
 
 
 LocationSummary* GotoInstr::MakeLocationSummary() const {
   return new LocationSummary(0, 0, LocationSummary::kNoCall);
 }
 
 
 void GotoInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // Add deoptimization descriptor for deoptimizing instructions
@@ skipping 234 matching lines @@
                          &label,
                          PcDescriptors::kOther,
                          locs());
   __ Drop(2);  // Discard type arguments and receiver.
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM