From 17c896a4b969e2f77e32f9017a1cee3a081ce5a1 Mon Sep 17 00:00:00 2001
From: Renato Golin <renato.golin@linaro.org>
Date: Wed, 7 Sep 2016 10:54:42 +0000
Subject: [PATCH] Revert "[EfficiencySanitizer] Adds shadow memory parameters
 for 40-bit virtual memory address."

This reverts commit r280796, as it broke the AArch64 bots for no reason.

The tests were passing and we should try to keep them passing, so a proper
review should make that happen.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280802 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../Instrumentation/EfficiencySanitizer.cpp   | 43 ++++---------------
 1 file changed, 9 insertions(+), 34 deletions(-)

diff --git a/lib/Transforms/Instrumentation/EfficiencySanitizer.cpp b/lib/Transforms/Instrumentation/EfficiencySanitizer.cpp
index b5a2dd5d7956..fb80f87369f9 100644
--- a/lib/Transforms/Instrumentation/EfficiencySanitizer.cpp
+++ b/lib/Transforms/Instrumentation/EfficiencySanitizer.cpp
@@ -99,23 +99,12 @@ static const char *const EsanWhichToolName = "__esan_which_tool";
 // FIXME: Try to place these shadow constants, the names of the __esan_*
 // interface functions, and the ToolType enum into a header shared between
 // llvm and compiler-rt.
-struct ShadowMemoryParams {
-  uint64_t ShadowMask;
-  uint64_t ShadowOffs[3];
-} ShadowParams;
-
-static const ShadowMemoryParams ShadowParams48 = {
-    0x00000fffffffffffull,
-    {
-        0x0000130000000000ull, 0x0000220000000000ull, 0x0000440000000000ull,
-    }};
-
-static const ShadowMemoryParams ShadowParams40 = {
-    0x0fffffffffull,
-    {
-        0x1300000000ull, 0x2200000000ull, 0x4400000000ull,
-    }};
-
+static const uint64_t ShadowMask = 0x00000fffffffffffull;
+static const uint64_t ShadowOffs[3] = { // Indexed by scale
+  0x0000130000000000ull,
+  0x0000220000000000ull,
+  0x0000440000000000ull,
+};
 // This array is indexed by the ToolType enum.
 static const int ShadowScale[] = {
   0, // ESAN_None.
@@ -539,20 +528,6 @@ void EfficiencySanitizer::createDestructor(Module &M, Constant *ToolInfoArg) {
 }
 
 bool EfficiencySanitizer::initOnModule(Module &M) {
-
-  Triple TargetTriple(M.getTargetTriple());
-  switch (TargetTriple.getArch()) {
-    case Triple::x86_64:
-      ShadowParams = ShadowParams48;
-      break;
-    case Triple::mips64:
-    case Triple::mips64el:
-      ShadowParams = ShadowParams40;
-      break;
-    default:
-      report_fatal_error("unsupported architecture");
-  }
-
   Ctx = &M.getContext();
   const DataLayout &DL = M.getDataLayout();
   IRBuilder<> IRB(M.getContext());
@@ -584,13 +559,13 @@ bool EfficiencySanitizer::initOnModule(Module &M) {
 
 Value *EfficiencySanitizer::appToShadow(Value *Shadow, IRBuilder<> &IRB) {
   // Shadow = ((App & Mask) + Offs) >> Scale
-  Shadow = IRB.CreateAnd(Shadow, ConstantInt::get(IntptrTy, ShadowParams.ShadowMask));
+  Shadow = IRB.CreateAnd(Shadow, ConstantInt::get(IntptrTy, ShadowMask));
   uint64_t Offs;
   int Scale = ShadowScale[Options.ToolType];
   if (Scale <= 2)
-    Offs = ShadowParams.ShadowOffs[Scale];
+    Offs = ShadowOffs[Scale];
   else
-    Offs = ShadowParams.ShadowOffs[0] << Scale;
+    Offs = ShadowOffs[0] << Scale;
   Shadow = IRB.CreateAdd(Shadow, ConstantInt::get(IntptrTy, Offs));
   if (Scale > 0)
     Shadow = IRB.CreateLShr(Shadow, Scale);