From f9e1e56ea17c0171ecc2095fae6335369abc94bc Mon Sep 17 00:00:00 2001
From: Ahmed Bougacha <ahmed.bougacha@gmail.com>
Date: Wed, 12 Nov 2014 21:23:34 +0000
Subject: [PATCH] Add fortified (__*_chk) library functions to TLI (NFC)

One of them (__memcpy_chk) was already there, the others were checked
by comparing function names.
Note that the fortified libfuncs are now part of TLI, but are always
available, because they aren't generated, only optimized into the
non-checking versions.

Differential Revision: http://reviews.llvm.org/D6179


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221817 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Target/TargetLibraryInfo.h   | 15 +++++++++++++
 lib/Target/TargetLibraryInfo.cpp          |  6 ++++++
 lib/Transforms/Utils/SimplifyLibCalls.cpp | 26 ++++++++---------------
 3 files changed, 30 insertions(+), 17 deletions(-)

diff --git a/include/llvm/Target/TargetLibraryInfo.h b/include/llvm/Target/TargetLibraryInfo.h
index 56a89191a58..46f87b93b00 100644
--- a/include/llvm/Target/TargetLibraryInfo.h
+++ b/include/llvm/Target/TargetLibraryInfo.h
@@ -73,6 +73,11 @@ namespace llvm {
       dunder_isoc99_sscanf,
       /// void *__memcpy_chk(void *s1, const void *s2, size_t n, size_t s1size);
       memcpy_chk,
+      /// void *__memmove_chk(void *s1, const void *s2, size_t n,
+      ///                     size_t s1size);
+      memmove_chk,
+      /// void *__memset_chk(void *s, char v, size_t n, size_t s1size);
+      memset_chk,
       /// double __sincospi_stret(double x);
       sincospi_stret,
       /// float __sincospif_stret(float x);
@@ -87,8 +92,18 @@ namespace llvm {
       sqrtf_finite,
       /// long double __sqrt_finite(long double x);
       sqrtl_finite,
+      /// char *__stpcpy_chk(char *s1, const char *s2, size_t s1size);
+      stpcpy_chk,
+      /// char *__stpncpy_chk(char *s1, const char *s2, size_t n,
+      ///                     size_t s1size);
+      stpncpy_chk,
+      /// char *__strcpy_chk(char *s1, const char *s2, size_t s1size);
+      strcpy_chk,
       /// char * __strdup(const char *s);
       dunder_strdup,
+      /// char *__strncpy_chk(char *s1, const char *s2, size_t n,
+      ///                     size_t s1size);
+      strncpy_chk,
       /// char *__strndup(const char *s, size_t n);
       dunder_strndup,
       /// char * __strtok_r(char *s, const char *delim, char **save_ptr);
diff --git a/lib/Target/TargetLibraryInfo.cpp b/lib/Target/TargetLibraryInfo.cpp
index ecb38198551..bca56b5c309 100644
--- a/lib/Target/TargetLibraryInfo.cpp
+++ b/lib/Target/TargetLibraryInfo.cpp
@@ -51,6 +51,8 @@ const char* TargetLibraryInfo::StandardNames[LibFunc::NumLibFuncs] =
     "__isoc99_scanf",
     "__isoc99_sscanf",
     "__memcpy_chk",
+    "__memmove_chk",
+    "__memset_chk",
     "__sincospi_stret",
     "__sincospif_stret",
     "__sinpi",
@@ -58,7 +60,11 @@ const char* TargetLibraryInfo::StandardNames[LibFunc::NumLibFuncs] =
     "__sqrt_finite",
     "__sqrtf_finite",
     "__sqrtl_finite",
+    "__stpcpy_chk",
+    "__stpncpy_chk",
+    "__strcpy_chk",
     "__strdup",
+    "__strncpy_chk",
     "__strndup",
     "__strtok_r",
     "abs",
diff --git a/lib/Transforms/Utils/SimplifyLibCalls.cpp b/lib/Transforms/Utils/SimplifyLibCalls.cpp
index 207d3664789..e7beb2feb62 100644
--- a/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -2184,28 +2184,20 @@ Value *LibCallSimplifier::optimizeCall(CallInst *CI) {
       return nullptr;
     case LibFunc::memcpy_chk:
       return optimizeMemCpyChk(CI, Builder);
-    default:
-      return nullptr;
-    }
-  }
-
-  if (!isCallingConvC)
-    return nullptr;
-
-  // Finally check for fortified library calls.
-  if (FuncName.endswith("_chk")) {
-    if (FuncName == "__memmove_chk")
+    case LibFunc::memmove_chk:
       return optimizeMemMoveChk(CI, Builder);
-    else if (FuncName == "__memset_chk")
+    case LibFunc::memset_chk:
       return optimizeMemSetChk(CI, Builder);
-    else if (FuncName == "__strcpy_chk")
+    case LibFunc::strcpy_chk:
       return optimizeStrCpyChk(CI, Builder);
-    else if (FuncName == "__stpcpy_chk")
+    case LibFunc::stpcpy_chk:
       return optimizeStpCpyChk(CI, Builder);
-    else if (FuncName == "__strncpy_chk")
-      return optimizeStrNCpyChk(CI, Builder);
-    else if (FuncName == "__stpncpy_chk")
+    case LibFunc::stpncpy_chk:
+    case LibFunc::strncpy_chk:
       return optimizeStrNCpyChk(CI, Builder);
+    default:
+      return nullptr;
+    }
   }
 
   return nullptr;
-- 
2.34.1