Add implicit null and stack checks for x86

This adds compiler and runtime changes for x86
implicit checks.  32 bit only.

Both host and target are supported.
By default, on the host, the implicit checks are null pointer and
stack overflow.  Suspend is implemented but not switched on.

Change-Id: I88a609e98d6bf32f283eaa4e6ec8bbf8dc1df78a

1 files changed, 5 insertions, 2 deletions

diff --git a/compiler/dex/quick/codegen_util.cc b/compiler/dex/quick/codegen_util.cc
index 5870d22208..1ac47073e2 100644
--- a/compiler/dex/quick/codegen_util.cc
+++ b/compiler/dex/quick/codegen_util.cc
@@ -1162,9 +1162,12 @@ bool Mir2Lir::BadOverlap(RegLocation rl_src, RegLocation rl_dest) {
 }
 
 LIR *Mir2Lir::OpCmpMemImmBranch(ConditionCode cond, RegStorage temp_reg, RegStorage base_reg,
-                                int offset, int check_value, LIR* target) {
+                                int offset, int check_value, LIR* target, LIR** compare) {
   // Handle this for architectures that can't compare to memory.
-  Load32Disp(base_reg, offset, temp_reg);
+  LIR* inst = Load32Disp(base_reg, offset, temp_reg);
+  if (compare != nullptr) {
+    *compare = inst;
+  }
   LIR* branch = OpCmpImmBranch(cond, temp_reg, check_value, target);
   return branch;
 }