Add the returns_twice attribute to LLVM.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141001 91177308-0d34-0410-b5e6-96231b3b80d8

9 files changed, 15 insertions, 9 deletions

diff --git a/docs/LangRef.html b/docs/LangRef.html
index 0ec08eb0a0..7882da67e1 100644
--- a/docs/LangRef.html
+++ b/docs/LangRef.html
@@ -1262,6 +1262,11 @@ define void @f() optsize { ... }
       the ELF x86-64 abi, but it can be disabled for some compilation
       units.</dd>
 
+  <dt><tt><b><a name="returns_twice">returns_twice</a></b></tt></dt>
+  <dd>This attribute indicates that this function can return
+  twice. The C <code>setjmp</code> is an example of such a function.
+  The compiler disables some optimizations (like tail calls) in the caller of
+  these functions.</dd>
 </dl>
 
 </div>
diff --git a/include/llvm/Attributes.h b/include/llvm/Attributes.h
index cd3ee35d74..2d7b33b29b 100644
--- a/include/llvm/Attributes.h
+++ b/include/llvm/Attributes.h
@@ -65,8 +65,7 @@ const Attributes StackAlignment  = 7<<26; ///< Alignment of stack for
                                           ///of alignment with +1 bias
                                           ///0 means unaligned (different from
                                           ///alignstack(1))
-const Attributes Hotpatch    = 1<<29;     ///< Function should have special
-                                          ///'hotpatch' sequence in prologue
+const Attributes ReturnsTwice    = 1<<29; ///< Function can return twice
 const Attributes UWTable     = 1<<30;     ///< Function must be in a unwind
                                           ///table
 const Attributes NonLazyBind = 1U<<31;    ///< Function is called early and/or
@@ -93,7 +92,7 @@ const Attributes ParameterOnly = ByVal | Nest | StructRet | NoCapture;
 const Attributes FunctionOnly = NoReturn | NoUnwind | ReadNone | ReadOnly |
   NoInline | AlwaysInline | OptimizeForSize | StackProtect | StackProtectReq |
   NoRedZone | NoImplicitFloat | Naked | InlineHint | StackAlignment |
-  Hotpatch | UWTable | NonLazyBind;
+  UWTable | NonLazyBind | ReturnsTwice;
 
 /// @brief Parameter attributes that do not apply to vararg call arguments.
 const Attributes VarArgsIncompatible = StructRet;
diff --git a/lib/AsmParser/LLLexer.cpp b/lib/AsmParser/LLLexer.cpp
index fdadd1ba93..029f9426f6 100644
--- a/lib/AsmParser/LLLexer.cpp
+++ b/lib/AsmParser/LLLexer.cpp
@@ -558,6 +558,7 @@ lltok::Kind LLLexer::LexIdentifier() {
   KEYWORD(readnone);
   KEYWORD(readonly);
   KEYWORD(uwtable);
+  KEYWORD(returns_twice);
 
   KEYWORD(inlinehint);
   KEYWORD(noinline);
diff --git a/lib/AsmParser/LLParser.cpp b/lib/AsmParser/LLParser.cpp
index 4d233cab6f..cafaab01af 100644
--- a/lib/AsmParser/LLParser.cpp
+++ b/lib/AsmParser/LLParser.cpp
@@ -911,6 +911,7 @@ bool LLParser::ParseOptionalAttrs(unsigned &Attrs, unsigned AttrKind) {
     case lltok::kw_noreturn:        Attrs |= Attribute::NoReturn; break;
     case lltok::kw_nounwind:        Attrs |= Attribute::NoUnwind; break;
     case lltok::kw_uwtable:         Attrs |= Attribute::UWTable; break;
+    case lltok::kw_returns_twice:   Attrs |= Attribute::ReturnsTwice; break;
     case lltok::kw_noinline:        Attrs |= Attribute::NoInline; break;
     case lltok::kw_readnone:        Attrs |= Attribute::ReadNone; break;
     case lltok::kw_readonly:        Attrs |= Attribute::ReadOnly; break;
@@ -922,7 +923,6 @@ bool LLParser::ParseOptionalAttrs(unsigned &Attrs, unsigned AttrKind) {
     case lltok::kw_noredzone:       Attrs |= Attribute::NoRedZone; break;
     case lltok::kw_noimplicitfloat: Attrs |= Attribute::NoImplicitFloat; break;
     case lltok::kw_naked:           Attrs |= Attribute::Naked; break;
-    case lltok::kw_hotpatch:        Attrs |= Attribute::Hotpatch; break;
     case lltok::kw_nonlazybind:     Attrs |= Attribute::NonLazyBind; break;
 
     case lltok::kw_alignstack: {
diff --git a/lib/AsmParser/LLToken.h b/lib/AsmParser/LLToken.h
index d22ecf31bd..acdd4b8ebf 100644
--- a/lib/AsmParser/LLToken.h
+++ b/lib/AsmParser/LLToken.h
@@ -90,6 +90,7 @@ namespace lltok {
     kw_readnone,
     kw_readonly,
     kw_uwtable,
+    kw_returns_twice,
 
     kw_inlinehint,
     kw_noinline,
diff --git a/lib/Target/CppBackend/CPPBackend.cpp b/lib/Target/CppBackend/CPPBackend.cpp
index 16401a8f98..9a6ff3292a 100644
--- a/lib/Target/CppBackend/CPPBackend.cpp
+++ b/lib/Target/CppBackend/CPPBackend.cpp
@@ -470,7 +470,7 @@ void CppWriter::printAttributes(const AttrListPtr &PAL,
       HANDLE_ATTR(NoImplicitFloat);
       HANDLE_ATTR(Naked);
       HANDLE_ATTR(InlineHint);
-      HANDLE_ATTR(Hotpatch);
+      HANDLE_ATTR(ReturnsTwice);
       HANDLE_ATTR(UWTable);
       HANDLE_ATTR(NonLazyBind);
 #undef HANDLE_ATTR
diff --git a/lib/VMCore/Attributes.cpp b/lib/VMCore/Attributes.cpp
index b728b9284b..485be75d1b 100644
--- a/lib/VMCore/Attributes.cpp
+++ b/lib/VMCore/Attributes.cpp
@@ -38,6 +38,8 @@ std::string Attribute::getAsString(Attributes Attrs) {
     Result += "nounwind ";
   if (Attrs & Attribute::UWTable)
     Result += "uwtable ";
+  if (Attrs & Attribute::ReturnsTwice)
+    Result += "returns_twice ";
   if (Attrs & Attribute::InReg)
     Result += "inreg ";
   if (Attrs & Attribute::NoAlias)
@@ -72,8 +74,6 @@ std::string Attribute::getAsString(Attributes Attrs) {
     Result += "noimplicitfloat ";
   if (Attrs & Attribute::Naked)
     Result += "naked ";
-  if (Attrs & Attribute::Hotpatch)
-    Result += "hotpatch ";
   if (Attrs & Attribute::NonLazyBind)
     Result += "nonlazybind ";
   if (Attrs & Attribute::StackAlignment) {
diff --git a/test/Transforms/Mem2Reg/2007-08-27-VolatileLoadsStores.ll b/test/Transforms/Mem2Reg/2007-08-27-VolatileLoadsStores.ll
index 50683cf8ba..52a8375312 100644
--- a/test/Transforms/Mem2Reg/2007-08-27-VolatileLoadsStores.ll
+++ b/test/Transforms/Mem2Reg/2007-08-27-VolatileLoadsStores.ll
@@ -42,6 +42,6 @@ return:		; preds = %bb6
 	ret i32 %retval8
 }
 
-declare i32 @_setjmp(%struct.__jmp_buf_tag*)
+declare i32 @_setjmp(%struct.__jmp_buf_tag*) returns_twice
 
 declare void @g()
diff --git a/test/Transforms/TailCallElim/setjmp.ll b/test/Transforms/TailCallElim/setjmp.ll
index 7b7fe56825..35bb75dddb 100644
--- a/test/Transforms/TailCallElim/setjmp.ll
+++ b/test/Transforms/TailCallElim/setjmp.ll
@@ -11,6 +11,6 @@ bb:
   ret void
 }
 
-declare i32 @setjmp(i32*)
+declare i32 @setjmp(i32*) returns_twice
 
 declare void @bar()