Iterate over PcDescriptors only via iterators, not via an index. (preparation for more compression …

runtime/vm/flow_graph_compiler_x64.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_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 1134 matching lines @@
 
   if (is_optimizing()) {
     lazy_deopt_pc_offset_ = assembler()->CodeSize();
     __ Jmp(&StubCode::DeoptimizeLazyLabel(), PP);
   }
 }
 
 
 void FlowGraphCompiler::GenerateCall(intptr_t token_pos,
                                      const ExternalLabel* label,
-                                     PcDescriptors::Kind kind,
+                                     RawPcDescriptors::Kind kind,
                                      LocationSummary* locs) {
   __ Call(label, PP);
   AddCurrentDescriptor(kind, Isolate::kNoDeoptId, token_pos);
   RecordSafepoint(locs);
 }
 
 
 void FlowGraphCompiler::GenerateDartCall(intptr_t deopt_id,
                                          intptr_t token_pos,
                                          const ExternalLabel* label,
-                                         PcDescriptors::Kind kind,
+                                         RawPcDescriptors::Kind kind,
                                          LocationSummary* locs) {
   __ CallPatchable(label);
   AddCurrentDescriptor(kind, deopt_id, token_pos);
   RecordSafepoint(locs);
   // Marks either the continuation point in unoptimized code or the
   // deoptimization point in optimized code, after call.
   const intptr_t deopt_id_after = Isolate::ToDeoptAfter(deopt_id);
   if (is_optimizing()) {
     AddDeoptIndexAtCall(deopt_id_after, token_pos);
   } else {
     // Add deoptimization continuation point after the call and before the
     // arguments are removed.
-    AddCurrentDescriptor(PcDescriptors::kDeopt, deopt_id_after, token_pos);
+    AddCurrentDescriptor(RawPcDescriptors::kDeopt, deopt_id_after, token_pos);
   }
 }
 
 
 void FlowGraphCompiler::GenerateRuntimeCall(intptr_t token_pos,
                                             intptr_t deopt_id,
                                             const RuntimeEntry& entry,
                                             intptr_t argument_count,
                                             LocationSummary* locs) {
   __ CallRuntime(entry, argument_count);
-  AddCurrentDescriptor(PcDescriptors::kOther, deopt_id, token_pos);
+  AddCurrentDescriptor(RawPcDescriptors::kOther, deopt_id, token_pos);
   RecordSafepoint(locs);
   if (deopt_id != Isolate::kNoDeoptId) {
     // Marks either the continuation point in unoptimized code or the
     // deoptimization point in optimized code, after call.
     const intptr_t deopt_id_after = Isolate::ToDeoptAfter(deopt_id);
     if (is_optimizing()) {
       AddDeoptIndexAtCall(deopt_id_after, token_pos);
     } else {
       // Add deoptimization continuation point after the call and before the
       // arguments are removed.
-      AddCurrentDescriptor(PcDescriptors::kDeopt, deopt_id_after, token_pos);
+      AddCurrentDescriptor(RawPcDescriptors::kDeopt, deopt_id_after, token_pos);
     }
   }
 }
 
 
 void FlowGraphCompiler::EmitUnoptimizedStaticCall(
     intptr_t argument_count,
     intptr_t deopt_id,
     intptr_t token_pos,
     LocationSummary* locs,
     const ICData& ic_data) {
   uword label_address = 0;
   if (ic_data.NumArgsTested() == 0) {
     label_address = StubCode::ZeroArgsUnoptimizedStaticCallEntryPoint();
   } else if (ic_data.NumArgsTested() == 2) {
     label_address = StubCode::TwoArgsUnoptimizedStaticCallEntryPoint();
   } else {
     UNIMPLEMENTED();
   }
   ExternalLabel target_label(label_address);
   __ movq(R10, Immediate(0));
   __ LoadObject(RBX, ic_data, PP);
   GenerateDartCall(deopt_id,
                    token_pos,
                    &target_label,
-                   PcDescriptors::kUnoptStaticCall,
+                   RawPcDescriptors::kUnoptStaticCall,
                    locs);
   __ Drop(argument_count);
 #if defined(DEBUG)
   __ movq(R10, Immediate(kInvalidObjectPointer));
 #endif
 }
 
 
 void FlowGraphCompiler::EmitEdgeCounter() {
   // We do not check for overflow when incrementing the edge counter.  The
@@ skipping 22 matching lines @@
   // function that corresponds to the Dart function of that IC call. Due
   // to inlining in optimized code, that function may not correspond to the
   // top-level function (parsed_function().function()) which could be
   // reoptimized and which counter needs to be incremented.
   // Pass the function explicitly, it is used in IC stub.
   __ LoadObject(RDI, parsed_function().function(), PP);
   __ LoadObject(RBX, ic_data, PP);
   GenerateDartCall(deopt_id,
                    token_pos,
                    target_label,
-                   PcDescriptors::kIcCall,
+                   RawPcDescriptors::kIcCall,
                    locs);
   __ Drop(argument_count);
 }
 
 
 void FlowGraphCompiler::EmitInstanceCall(ExternalLabel* target_label,
                                          const ICData& ic_data,
                                          intptr_t argument_count,
                                          intptr_t deopt_id,
                                          intptr_t token_pos,
                                          LocationSummary* locs) {
   ASSERT(Array::Handle(ic_data.arguments_descriptor()).Length() > 0);
   __ movq(R10, Immediate(0));
   __ LoadObject(RBX, ic_data, PP);
   GenerateDartCall(deopt_id,
                    token_pos,
                    target_label,
-                   PcDescriptors::kIcCall,
+                   RawPcDescriptors::kIcCall,
                    locs);
   __ Drop(argument_count);
 #if defined(DEBUG)
   __ movq(R10, Immediate(kInvalidObjectPointer));
 #endif
 }
 
 
 void FlowGraphCompiler::EmitMegamorphicInstanceCall(
     const ICData& ic_data,
@@ skipping 41 matching lines @@
   // proper target for the given name and arguments descriptor.  If the
   // illegal class id was found, the target is a cache miss handler that can
   // be invoked as a normal Dart function.
   __ movq(RAX, FieldAddress(RDI, RCX, TIMES_8, base + kWordSize));
   __ movq(RCX, FieldAddress(RAX, Function::instructions_offset()));
   __ LoadObject(RBX, ic_data, PP);
   __ LoadObject(R10, arguments_descriptor, PP);
   __ AddImmediate(
       RCX, Immediate(Instructions::HeaderSize() - kHeapObjectTag), PP);
   __ call(RCX);
-  AddCurrentDescriptor(PcDescriptors::kOther, Isolate::kNoDeoptId, token_pos);
+  AddCurrentDescriptor(RawPcDescriptors::kOther,
+      Isolate::kNoDeoptId, token_pos);
   RecordSafepoint(locs);
   AddDeoptIndexAtCall(Isolate::ToDeoptAfter(deopt_id), token_pos);
   __ Drop(argument_count);
 }
 
 
 void FlowGraphCompiler::EmitOptimizedStaticCall(
     const Function& function,
     const Array& arguments_descriptor,
     intptr_t argument_count,
     intptr_t deopt_id,
     intptr_t token_pos,
     LocationSummary* locs) {
   __ LoadObject(R10, arguments_descriptor, PP);
   // Do not use the code from the function, but let the code be patched so that
   // we can record the outgoing edges to other code.
   GenerateDartCall(deopt_id,
                    token_pos,
                    &StubCode::CallStaticFunctionLabel(),
-                   PcDescriptors::kOptStaticCall,
+                   RawPcDescriptors::kOptStaticCall,
                    locs);
   AddStaticCallTarget(function);
   __ Drop(argument_count);
 }
 
 
 void FlowGraphCompiler::EmitEqualityRegConstCompare(Register reg,
                                                     const Object& obj,
                                                     bool needs_number_check,
                                                     intptr_t token_pos) {
   ASSERT(!needs_number_check ||
          (!obj.IsMint() && !obj.IsDouble() && !obj.IsBigint()));
 
   if (obj.IsSmi() && (Smi::Cast(obj).Value() == 0)) {
     ASSERT(!needs_number_check);
     __ testq(reg, reg);
     return;
   }
 
   if (needs_number_check) {
     __ pushq(reg);
     __ PushObject(obj, PP);
     if (is_optimizing()) {
       __ CallPatchable(&StubCode::OptimizedIdenticalWithNumberCheckLabel());
     } else {
       __ CallPatchable(&StubCode::UnoptimizedIdenticalWithNumberCheckLabel());
     }
     if (token_pos != Scanner::kNoSourcePos) {
-      AddCurrentDescriptor(PcDescriptors::kRuntimeCall,
+      AddCurrentDescriptor(RawPcDescriptors::kRuntimeCall,
                            Isolate::kNoDeoptId,
                            token_pos);
     }
     __ popq(reg);  // Discard constant.
     __ popq(reg);  // Restore 'reg'.
     return;
   }
 
   __ CompareObject(reg, obj, PP);
 }
 
 
 void FlowGraphCompiler::EmitEqualityRegRegCompare(Register left,
                                                   Register right,
                                                   bool needs_number_check,
                                                   intptr_t token_pos) {
   if (needs_number_check) {
     __ pushq(left);
     __ pushq(right);
     if (is_optimizing()) {
       __ CallPatchable(&StubCode::OptimizedIdenticalWithNumberCheckLabel());
     } else {
       __ movq(R10, Immediate(0));
       __ movq(RBX, Immediate(0));
       __ CallPatchable(&StubCode::UnoptimizedIdenticalWithNumberCheckLabel());
     }
     if (token_pos != Scanner::kNoSourcePos) {
-      AddCurrentDescriptor(PcDescriptors::kRuntimeCall,
+      AddCurrentDescriptor(RawPcDescriptors::kRuntimeCall,
                            Isolate::kNoDeoptId,
                            token_pos);
     }
 #if defined(DEBUG)
     // Do this *after* adding the pc descriptor!
     if (!is_optimizing()) {
       __ movq(R10, Immediate(kInvalidObjectPointer));
       __ movq(RBX, Immediate(kInvalidObjectPointer));
     }
 #endif
@@ skipping 48 matching lines @@
     if (is_last_check) {
       __ j(NOT_EQUAL, deopt);
     } else {
       __ j(NOT_EQUAL, &next_test);
     }
     // Do not use the code from the function, but let the code be patched so
     // that we can record the outgoing edges to other code.
     GenerateDartCall(deopt_id,
                      token_index,
                      &StubCode::CallStaticFunctionLabel(),
-                     PcDescriptors::kOptStaticCall,
+                     RawPcDescriptors::kOptStaticCall,
                      locs);
     const Function& function = *sorted[i].target;
     AddStaticCallTarget(function);
     __ Drop(argument_count);
     if (!is_last_check) {
       __ jmp(&match_found);
     }
     __ Bind(&next_test);
   }
   __ Bind(&match_found);
@@ skipping 210 matching lines @@
   __ movups(reg, Address(RSP, 0));
   __ AddImmediate(RSP, Immediate(kFpuRegisterSize), PP);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64