ART: Implement try/catch blocks in Builder

This patch enables the GraphBuilder to generate blocks and edges which
represent the exceptional control flow when try/catch blocks are
present in the code. Actual compilation is still delegated to Quick
and Baseline ignores the additional code.

To represent the relationship between try and catch blocks, Builder
splits the edges which enter/exit a try block and links the newly
created blocks to the corresponding exception handlers. This layout
will later enable the SsaBuilder to correctly infer the dominators of
the catch blocks and to produce the appropriate reverse post ordering.
It will not, however, allow for building the complete SSA form of the
catch blocks and consequently optimizing such blocks.

To this end, a new TryBoundary control-flow instruction is introduced.
Codegen treats it the same as a Goto but it allows for additional
successors (the handlers).

Change-Id: I415b985596d5bebb7b1bb358a46e08b7b04bb53a

1 files changed, 3 insertions, 3 deletions

diff --git a/compiler/optimizing/code_generator.cc b/compiler/optimizing/code_generator.cc
index cd10935806..4607ebe548 100644
--- a/compiler/optimizing/code_generator.cc
+++ b/compiler/optimizing/code_generator.cc
@@ -146,7 +146,7 @@ bool CodeGenerator::GoesToNextBlock(HBasicBlock* current, HBasicBlock* next) con
 HBasicBlock* CodeGenerator::GetNextBlockToEmit() const {
   for (size_t i = current_block_index_ + 1; i < block_order_->Size(); ++i) {
     HBasicBlock* block = block_order_->Get(i);
-    if (!block->IsSingleGoto()) {
+    if (!block->IsSingleJump()) {
       return block;
     }
   }
@@ -154,7 +154,7 @@ HBasicBlock* CodeGenerator::GetNextBlockToEmit() const {
 }
 
 HBasicBlock* CodeGenerator::FirstNonEmptyBlock(HBasicBlock* block) const {
-  while (block->IsSingleGoto()) {
+  while (block->IsSingleJump()) {
     block = block->GetSuccessors().Get(0);
   }
   return block;
@@ -214,7 +214,7 @@ void CodeGenerator::CompileInternal(CodeAllocator* allocator, bool is_baseline)
     // Don't generate code for an empty block. Its predecessors will branch to its successor
     // directly. Also, the label of that block will not be emitted, so this helps catch
     // errors where we reference that label.
-    if (block->IsSingleGoto()) continue;
+    if (block->IsSingleJump()) continue;
     Bind(block);
     for (HInstructionIterator it(block->GetInstructions()); !it.Done(); it.Advance()) {
       HInstruction* current = it.Current();