From bf5b13d07ec942c865479448e1b9344fe0c9509f Mon Sep 17 00:00:00 2001 From: Bill Wendling Date: Thu, 12 Jan 2012 23:06:28 +0000 Subject: [PATCH] Revert accidental commit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148065 91177308-0d34-0410-b5e6-96231b3b80d8 --- docs/LangRef.html | 137 -------------------------- lib/CodeGen/AsmPrinter/AsmPrinter.cpp | 65 ------------ 2 files changed, 202 deletions(-) diff --git a/docs/LangRef.html b/docs/LangRef.html index 6881620cbc0..27990837487 100644 --- a/docs/LangRef.html +++ b/docs/LangRef.html @@ -106,11 +106,6 @@
  • 'fpaccuracy' Metadata
    • -
  • Module Flags Metadata -
      -
    1. Objective-C Metadata
      2. -
    -
  • Intrinsic Global Variables @@ -3029,138 +3024,6 @@ call void @llvm.dbg.value(metadata !24, i64 0, metadata !25) - - - -

    - Module Flags Metadata -

    - -
    - -

    Occasionally, the front-end needs to transmit data to the linker which - affects its behavior. The LLVM IR isn't sufficient to transmit this - information, so one should use the llvm.module.flags named - metadata.

    - -

    The llvm.module.flags metadata is a named metadata, whose elements - consist of metadata triplets. For example:

    - -
    -!0 = metadata !{ i32 0, metadata !"foo", i32 1 }
-!1 = metadata !{ i32 1, metadata !"bar", i32 37 }
-
-!llvm.module.flags = !{ !0, !1 }
-
    - -

    The first field specifies the behavior of the linker upon encountering two of - the same values. Behavior could range from: emitting an error if some of the - modules' flags disagree, emitting a warning, etc. The second field is the - name of the metadata. The third field is the value of the metadata.

    - -

    When two modules are linked together, the llvm.module.flags metadata - are unioned together.

    - -
    - - -

    - Objective-C Metadata -

    - -
    - -

    The following module flags are used to convey Objective-C metadata to the - linker.

    - - - - - - - - - - - - - - - - - - - - -
    ValueBehavior
    1 -
    -
    Error
    -
    Causes the linker to emit an error when two values disagree.
    -
    -
    2 -
    -
    Require
    -
    Causes the linker to emit an error when the specified value is not - present.
    -
    -
    3 -
    -
    Override
    -
    Causes the linker to use the specified value if the two values - disagree. It's an error if two pieces of the same metadata have - the Override behavior but different values.
    -
    -
    - -

    The names are:

    - -
      -
    • Objective-C Version
      • -
    • Objective-C Garbage Collection
      • -
    • Objective-C GC Only
      • -
    • Objective-C Image Info Section
      • -
    - -

    - -

    Here is an example of how to use the Objective-C metadata:

    - -
    -Module A
-!0 = metadata !{ i32 1, metadata !"Objective-C Version", i32 2 }
-!1 = metadata !{ i32 1, metadata !"Objective-C Garbage Collection", i32 2 }
-!2 = metadata !{ i32 1, metadata !"Objective-C Image Info Section",
-                 metadata !"__DATA, __objc_imageinfo, regular, no_dead_strip" }
-!llvm.module.flags = !{ !0, !1, !2 }
-
-Module B
-!0 = metadata !{ i32 1, metadata !"Objective-C Version", i32 2 }
-!1 = metadata !{ i32 1, metadata !"Objective-C Garbage Collection", i32 2 }
-!2 = metadata !{ i32 1, metadata !"Objective-C GC Only", i32 4 }
-!3 = metadata !{ i32 1, metadata !"Objective-C Image Info Section",
-                 metadata !"__DATA, __objc_imageinfo, regular, no_dead_strip" }
-!4 = metadata !{ i32 2, metadata !"Objective-C GC Only",
-  metadata !{
-    metadata !"Objective-C Garbage Collection", i32 2
-  }
-}
-!llvm.module.flags = !{ !0, !1, !2, !3, !4 }
-
-Linked Module
-!0 = metadata !{ i32 1, metadata !"Objective-C Version", i32 2 }
-!1 = metadata !{ i32 3, metadata !"Objective-C Garbage Collection", i32 2 }
-!2 = metadata !{ i32 1, metadata !"Objective-C GC Only", i32 4 }
-!3 = metadata !{ i32 1, metadata !"Objective-C Image Info Section",
-                 metadata !"__DATA, __objc_imageinfo, regular, no_dead_strip" }
-!4 = metadata !{ i32 2, metadata !"Objective-C GC Only",
-  metadata !{
-    metadata !"Objective-C Garbage Collection", i32 2
-  }
-}
-!llvm.module.flags = !{ !0, !1, !2, !3, !4 }
-
    - -
    diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp index 1b15cdcc810..82860c26574 100644 --- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp +++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp @@ -930,71 +930,6 @@ bool AsmPrinter::doFinalization(Module &M) { if (const MCSection *S = MAI->getNonexecutableStackSection(OutContext)) OutStreamer.SwitchSection(S); - // If we have module flags, then emit them. - NamedMDNode *ModFlags = M.getNamedMetadata("llvm.module.flags"); - if (ModFlags) { - const char *ObjCGCName = "Objective-C Garbage Collection"; - const char *ObjCGCOnlyName = "Objective-C GC Only"; - const char *ObjCImageInfoVersion = "Objective-C Image Info Version"; - const char *ObjCImageInfoSec = "Objective-C Image Info Section"; - - MDNode *GC = 0; - MDNode *GCOnly = 0; - MDNode *ImageInfoVersion = 0; - MDNode *ImageInfoSec = 0; - - for (unsigned I = 0, E = ModFlags->getNumOperands(); I != E; ++I) { - MDNode *MD = ModFlags->getOperand(I); - unsigned Behavior = cast(MD->getOperand(0))->getZExtValue(); - (void) Behavior; - MDString *Str = cast(MD->getOperand(1)); - - if (Str->getString() == ObjCImageInfoVersion) { - assert(Behavior == 1 && "Invalid behavior for module flag!"); - ImageInfoVersion = MD; - } else if (Str->getString() == ObjCGCName) { - assert((Behavior == 1 || Behavior == 3) && - "Invalid behavior for module flag!"); - GC = MD; - } else if (Str->getString() == ObjCGCOnlyName) { - if (Behavior == 2) continue; // Ignore the 'require' clause. - GCOnly = MD; - } else if (Str->getString() == ObjCImageInfoSec) { - assert(Behavior == 1 && "Invalid behavior for module flag!"); - ImageInfoSec = MD; - } - } - - if (ImageInfoVersion || GC || GCOnly || ImageInfoSec) { - // FIXME: Duh! - unsigned version = 0; - unsigned flags = 0; - - version = - cast(ImageInfoVersion->getOperand(2))->getZExtValue(); - if (GC) - flags |= cast(GC->getOperand(2))->getZExtValue(); - if (GCOnly) - flags |= cast(GCOnly->getOperand(2))->getZExtValue(); - - Type *Int32Ty = Type::getInt32Ty(M.getContext()); - Constant *values[2] = { - ConstantInt::get(Int32Ty, version), - ConstantInt::get(Int32Ty, flags) - }; - ArrayType *AT = ArrayType::get(Int32Ty, 2); - StringRef Sec = cast(ImageInfoSec->getOperand(2))->getString(); - - GlobalVariable *GV = - cast(M.getOrInsertGlobal("L_OBJC_IMAGE_INFO", AT)); - GV->setConstant(true); - GV->setSection(Sec); - GV->setInitializer(ConstantArray::get(AT, values)); - - EmitGlobalVariable(GV); - } - } - // Allow the target to emit any magic that it wants at the end of the file, // after everything else has gone out. EmitEndOfAsmFile(M);