ART: API to dex instructions
- Added the GetConstant function call in DecodedInstruction.
- Added a few rewriter helper functions for later higher level rewriting.
- Added Setter/Getter data and query functions.
- Added Clobber memory/Const/Call/Cast data and query functions.
- Added expression information (add, multiply, ...).
- Added a IsLinear function for additions and subtractions.
- Added an empty constructor for the DecodedInstruction:
- Useful for the creation of a MIR constructor too.
- Added the IsConditionalBranch utility function.
Signed-off-by: Jean Christophe Beyler <jean.christophe.beyler@intel.com>
Signed-off-by: Razvan A Lupusoru <razvan.a.lupusoru@intel.com>
Signed-off-by: Yixin Shou <yixin.shou@intel.com>
Signed-off-by: Chao-ying Fu <chao-ying.fu@intel.com>
Signed-off-by: Udayan Banerji <udayan.banerji@intel.com>
Change-Id: Ie21f2a7779b38c1b383334f04126c2d792cae462
diff --git a/compiler/dex/mir_graph.cc b/compiler/dex/mir_graph.cc
index 4ba6677..1b0c7b0 100644
--- a/compiler/dex/mir_graph.cc
+++ b/compiler/dex/mir_graph.cc
@@ -1490,4 +1490,57 @@
return res;
}
+/**
+ * @brief Given a decoded instruction, it checks whether the instruction
+ * sets a constant and if it does, more information is provided about the
+ * constant being set.
+ * @param ptr_value pointer to a 64-bit holder for the constant.
+ * @param wide Updated by function whether a wide constant is being set by bytecode.
+ * @return Returns false if the decoded instruction does not represent a constant bytecode.
+ */
+bool MIR::DecodedInstruction::GetConstant(int64_t* ptr_value, bool* wide) const {
+ bool sets_const = true;
+ int64_t value = vB;
+
+ DCHECK(ptr_value != nullptr);
+ DCHECK(wide != nullptr);
+
+ switch (opcode) {
+ case Instruction::CONST_4:
+ case Instruction::CONST_16:
+ case Instruction::CONST:
+ *wide = false;
+ value <<= 32; // In order to get the sign extend.
+ value >>= 32;
+ break;
+ case Instruction::CONST_HIGH16:
+ *wide = false;
+ value <<= 48; // In order to get the sign extend.
+ value >>= 32;
+ break;
+ case Instruction::CONST_WIDE_16:
+ case Instruction::CONST_WIDE_32:
+ *wide = true;
+ value <<= 32; // In order to get the sign extend.
+ value >>= 32;
+ break;
+ case Instruction::CONST_WIDE:
+ *wide = true;
+ value = vB_wide;
+ break;
+ case Instruction::CONST_WIDE_HIGH16:
+ *wide = true;
+ value <<= 48; // In order to get the sign extend.
+ break;
+ default:
+ sets_const = false;
+ break;
+ }
+
+ if (sets_const) {
+ *ptr_value = value;
+ }
+
+ return sets_const;
+}
} // namespace art