[PATCH] [asan-asm-instrumentation] Fixed memory references which includes %rsp as a base or an index register.

[Evgeniy Stepanov]

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Comment at: lib/Target/X86/AsmParser/X86AsmInstrumentation.cpp:302
@@ -307,2 +301,3 @@
 
-  virtual void StoreFlags(MCStreamer &Out) override {
+  virtual void StoreReg(MCStreamer &Out, unsigned Reg) {
+    EmitInstruction(Out, MCInstBuilder(X86::PUSH32r).addReg(Reg));
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I think the common term is "spill".

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Comment at: lib/Target/X86/AsmParser/X86AsmInstrumentation.cpp:707
@@ +706,3 @@
+
+  void ComputeMemOperandAddress(X86Operand &Op, unsigned Reg, MCContext &Ctx,
+                                MCStreamer &Out) {
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I wonder if this could be moved to the parent class to reduce code duplication.

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Comment at: test/Instrumentation/AddressSanitizer/X86/asm_rsp_mem_op.s:12
@@ +11,3 @@
+# CHECK: leaq 8(%rsp), %rdi
+# CHECK-NEXT: leaq 152(%rdi), %rdi
+# CHECK: callq __asan_report_load8 at PLT
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This could be done with 1 lea instruction.

http://reviews.llvm.org/D5599