Add argmemonly attribute.

This change adds new attribute called "argmemonly". Function marked with this attribute can only access memory through it's argument pointers. This attribute directly corresponds to the "OnlyAccessesArgumentPointees" ModRef behaviour in alias analysis.

Differential Revision: http://reviews.llvm.org/D10398

llvm-svn: 241979

1 files changed, 38 insertions, 29 deletions

diff --git a/llvm/lib/AsmParser/LLParser.cpp b/llvm/lib/AsmParser/LLParser.cpp
index aa96d60ca0d..1c6e7bd18d0 100644
--- a/llvm/lib/AsmParser/LLParser.cpp
+++ b/llvm/lib/AsmParser/LLParser.cpp
@@ -946,35 +946,42 @@ bool LLParser::ParseFnAttributeValuePairs(AttrBuilder &B,
       B.addStackAlignmentAttr(Alignment);
       continue;
     }
-    case lltok::kw_alwaysinline:      B.addAttribute(Attribute::AlwaysInline); break;
-    case lltok::kw_builtin:           B.addAttribute(Attribute::Builtin); break;
-    case lltok::kw_cold:              B.addAttribute(Attribute::Cold); break;
-    case lltok::kw_convergent:        B.addAttribute(Attribute::Convergent); break;
-    case lltok::kw_inlinehint:        B.addAttribute(Attribute::InlineHint); break;
-    case lltok::kw_jumptable:         B.addAttribute(Attribute::JumpTable); break;
-    case lltok::kw_minsize:           B.addAttribute(Attribute::MinSize); break;
-    case lltok::kw_naked:             B.addAttribute(Attribute::Naked); break;
-    case lltok::kw_nobuiltin:         B.addAttribute(Attribute::NoBuiltin); break;
-    case lltok::kw_noduplicate:       B.addAttribute(Attribute::NoDuplicate); break;
-    case lltok::kw_noimplicitfloat:   B.addAttribute(Attribute::NoImplicitFloat); break;
-    case lltok::kw_noinline:          B.addAttribute(Attribute::NoInline); break;
-    case lltok::kw_nonlazybind:       B.addAttribute(Attribute::NonLazyBind); break;
-    case lltok::kw_noredzone:         B.addAttribute(Attribute::NoRedZone); break;
-    case lltok::kw_noreturn:          B.addAttribute(Attribute::NoReturn); break;
-    case lltok::kw_nounwind:          B.addAttribute(Attribute::NoUnwind); break;
-    case lltok::kw_optnone:           B.addAttribute(Attribute::OptimizeNone); break;
-    case lltok::kw_optsize:           B.addAttribute(Attribute::OptimizeForSize); break;
-    case lltok::kw_readnone:          B.addAttribute(Attribute::ReadNone); break;
-    case lltok::kw_readonly:          B.addAttribute(Attribute::ReadOnly); break;
-    case lltok::kw_returns_twice:     B.addAttribute(Attribute::ReturnsTwice); break;
-    case lltok::kw_ssp:               B.addAttribute(Attribute::StackProtect); break;
-    case lltok::kw_sspreq:            B.addAttribute(Attribute::StackProtectReq); break;
-    case lltok::kw_sspstrong:         B.addAttribute(Attribute::StackProtectStrong); break;
-    case lltok::kw_safestack:         B.addAttribute(Attribute::SafeStack); break;
-    case lltok::kw_sanitize_address:  B.addAttribute(Attribute::SanitizeAddress); break;
-    case lltok::kw_sanitize_thread:   B.addAttribute(Attribute::SanitizeThread); break;
-    case lltok::kw_sanitize_memory:   B.addAttribute(Attribute::SanitizeMemory); break;
-    case lltok::kw_uwtable:           B.addAttribute(Attribute::UWTable); break;
+    case lltok::kw_alwaysinline: B.addAttribute(Attribute::AlwaysInline); break;
+    case lltok::kw_argmemonly: B.addAttribute(Attribute::ArgMemOnly); break;
+    case lltok::kw_builtin: B.addAttribute(Attribute::Builtin); break;
+    case lltok::kw_cold: B.addAttribute(Attribute::Cold); break;
+    case lltok::kw_convergent: B.addAttribute(Attribute::Convergent); break;
+    case lltok::kw_inlinehint: B.addAttribute(Attribute::InlineHint); break;
+    case lltok::kw_jumptable: B.addAttribute(Attribute::JumpTable); break;
+    case lltok::kw_minsize: B.addAttribute(Attribute::MinSize); break;
+    case lltok::kw_naked: B.addAttribute(Attribute::Naked); break;
+    case lltok::kw_nobuiltin: B.addAttribute(Attribute::NoBuiltin); break;
+    case lltok::kw_noduplicate: B.addAttribute(Attribute::NoDuplicate); break;
+    case lltok::kw_noimplicitfloat:
+      B.addAttribute(Attribute::NoImplicitFloat); break;
+    case lltok::kw_noinline: B.addAttribute(Attribute::NoInline); break;
+    case lltok::kw_nonlazybind: B.addAttribute(Attribute::NonLazyBind); break;
+    case lltok::kw_noredzone: B.addAttribute(Attribute::NoRedZone); break;
+    case lltok::kw_noreturn: B.addAttribute(Attribute::NoReturn); break;
+    case lltok::kw_nounwind: B.addAttribute(Attribute::NoUnwind); break;
+    case lltok::kw_optnone: B.addAttribute(Attribute::OptimizeNone); break;
+    case lltok::kw_optsize: B.addAttribute(Attribute::OptimizeForSize); break;
+    case lltok::kw_readnone: B.addAttribute(Attribute::ReadNone); break;
+    case lltok::kw_readonly: B.addAttribute(Attribute::ReadOnly); break;
+    case lltok::kw_returns_twice:
+      B.addAttribute(Attribute::ReturnsTwice); break;
+    case lltok::kw_ssp: B.addAttribute(Attribute::StackProtect); break;
+    case lltok::kw_sspreq: B.addAttribute(Attribute::StackProtectReq); break;
+    case lltok::kw_sspstrong:
+      B.addAttribute(Attribute::StackProtectStrong); break;
+    case lltok::kw_safestack: B.addAttribute(Attribute::SafeStack); break;
+    case lltok::kw_sanitize_address:
+      B.addAttribute(Attribute::SanitizeAddress); break;
+    case lltok::kw_sanitize_thread:
+      B.addAttribute(Attribute::SanitizeThread); break;
+    case lltok::kw_sanitize_memory:
+      B.addAttribute(Attribute::SanitizeMemory); break;
+    case lltok::kw_uwtable: B.addAttribute(Attribute::UWTable); break;
 
     // Error handling.
     case lltok::kw_inreg:
@@ -1258,6 +1265,7 @@ bool LLParser::ParseOptionalParamAttrs(AttrBuilder &B) {
 
     case lltok::kw_alignstack:
     case lltok::kw_alwaysinline:
+    case lltok::kw_argmemonly:
     case lltok::kw_builtin:
     case lltok::kw_inlinehint:
     case lltok::kw_jumptable:
@@ -1334,6 +1342,7 @@ bool LLParser::ParseOptionalReturnAttrs(AttrBuilder &B) {
 
     case lltok::kw_alignstack:
     case lltok::kw_alwaysinline:
+    case lltok::kw_argmemonly:
     case lltok::kw_builtin:
     case lltok::kw_cold:
     case lltok::kw_inlinehint: