Extend assembler with ability to produce comments for the generated code.

runtime/vm/flow_graph_compiler_x64.cc

 // Copyright (c) 2012, 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 "lib/error.h"
@@ skipping 1104 matching lines @@
   ASSERT(!comp->stacktrace_var().is_captured());
   __ movq(Address(RBP, comp->exception_var().index() * kWordSize),
           kExceptionObjectReg);
   __ movq(Address(RBP, comp->stacktrace_var().index() * kWordSize),
           kStackTraceObjectReg);
 }
 
 
 void FlowGraphCompiler::VisitBlocks() {
   for (intptr_t i = 0; i < block_order_.length(); ++i) {
+    __ Comment("B%d", i);
     // Compile the block entry.
     current_block_ = block_order_[i];
     Instruction* instr = current_block()->Accept(this);
     // Compile all successors until an exit, branch, or a block entry.
     while ((instr != NULL) && !instr->IsBlockEntry()) {
+      __ Comment("@%d: instruction", instr->cid());
       instr = instr->Accept(this);
     }
 
     BlockEntryInstr* successor =
         (instr == NULL) ? NULL : instr->AsBlockEntry();
     if (successor != NULL) {
       // Block ended with a "goto".  We can fall through if it is the
       // next block in the list.  Otherwise, we need a jump.
       if ((i == block_order_.length() - 1) ||
           (block_order_[i + 1] != successor)) {
@@ skipping 554 matching lines @@
 
 
 void FlowGraphCompiler::FinalizeExceptionHandlers(const Code& code) {
   ASSERT(exception_handlers_list_ != NULL);
   const ExceptionHandlers& handlers = ExceptionHandlers::Handle(
       exception_handlers_list_->FinalizeExceptionHandlers(code.EntryPoint()));
   code.set_exception_handlers(handlers);
 }
 
 
+void FlowGraphCompiler::FinalizeComments(const Code& code) {
+  code.set_comments(assembler_->GetCodeComments());
+}
+
+
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64