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[MC/Mach-O] Implement integrated assembler support for linker options.

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- Also, fixup syntax errors in LangRef and missing newline in the MCAsmStreamer.

llvm-svn: 172837
This commit is contained in:
Daniel Dunbar 2013-01-18 19:37:00 +00:00
parent 6e330c4866
commit bda778db3b
4 changed files with 65 additions and 10 deletions
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6
docs/LangRef.rst
View File

@ -2628,10 +2628,10 @@ For example, the following metadata section specifies two separate sets of
linker options, presumably to link against ``libz`` and the ``Cocoa``
framework::
!0 = metadata !{ i32 6, "Linker Options",
!0 = metadata !{ i32 6, metadata !"Linker Options",
metadata !{
!metadata { metadata !"-lz" },
!metadata { metadata !"-framework", metadata !"Cocoa" } } }
metadata !{ metadata !"-lz" },
metadata !{ metadata !"-framework", metadata !"Cocoa" } } }
!llvm.module.flags = !{ !0 }
The metadata encoding as lists of lists of options, as opposed to a collapsed

33
lib/CodeGen/TargetLoweringObjectFileImpl.cpp
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@ -406,14 +406,14 @@ TargetLoweringObjectFileELF::InitializeELF(bool UseInitArray_) {
// MachO
//===----------------------------------------------------------------------===//
/// emitModuleFlags - Emit the module flags that specify the garbage collection
/// information.
/// emitModuleFlags - Perform code emission for module flags.
void TargetLoweringObjectFileMachO::
emitModuleFlags(MCStreamer &Streamer,
ArrayRef<Module::ModuleFlagEntry> ModuleFlags,
Mangler *Mang, const TargetMachine &TM) const {
unsigned VersionVal = 0;
unsigned ImageInfoFlags = 0;
MDNode *LinkerOptions = 0;
StringRef SectionVal;
for (ArrayRef<Module::ModuleFlagEntry>::iterator
@ -427,14 +427,33 @@ emitModuleFlags(MCStreamer &Streamer,
StringRef Key = MFE.Key->getString();
Value *Val = MFE.Val;
if (Key == "Objective-C Image Info Version")
if (Key == "Objective-C Image Info Version") {
VersionVal = cast<ConstantInt>(Val)->getZExtValue();
else if (Key == "Objective-C Garbage Collection" ||
Key == "Objective-C GC Only" ||
Key == "Objective-C Is Simulated")
} else if (Key == "Objective-C Garbage Collection" ||
Key == "Objective-C GC Only" ||
Key == "Objective-C Is Simulated") {
ImageInfoFlags |= cast<ConstantInt>(Val)->getZExtValue();
else if (Key == "Objective-C Image Info Section")
} else if (Key == "Objective-C Image Info Section") {
SectionVal = cast<MDString>(Val)->getString();
} else if (Key == "Linker Options") {
LinkerOptions = cast<MDNode>(Val);
}
}
// Emit the linker options if present.
if (LinkerOptions) {
for (unsigned i = 0, e = LinkerOptions->getNumOperands(); i != e; ++i) {
MDNode *MDOptions = cast<MDNode>(LinkerOptions->getOperand(i));
SmallVector<std::string, 4> StrOptions;
// Convert to strings.
for (unsigned ii = 0, ie = MDOptions->getNumOperands(); ii != ie; ++ii) {
MDString *MDOption = cast<MDString>(MDOptions->getOperand(ii));
StrOptions.push_back(MDOption->getString());
}
Streamer.EmitLinkerOptions(StrOptions);
}
}
// The section is mandatory. If we don't have it, then we don't have GC info.

1
lib/MC/MCAsmStreamer.cpp
View File

@ -383,6 +383,7 @@ void MCAsmStreamer::EmitLinkerOptions(ArrayRef<std::string> Options) {
ie = Options.end(); it != ie; ++it) {
OS << ", " << '"' << *it << '"';
}
OS << "\n";
}
void MCAsmStreamer::EmitDataRegion(MCDataRegionType Kind) {

35
test/MC/MachO/linker-options.ll Normal file
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@ -0,0 +1,35 @@
; RUN: llc -O0 -mtriple=x86_64-apple-darwin -o - %s > %t
; RUN: FileCheck --check-prefix=CHECK-ASM < %t %s
; CHECK-ASM: .linker_option "-lz"
; CHECK-ASM-NEXT: .linker_option "-framework", "Cocoa"
; RUN: llc -O0 -mtriple=x86_64-apple-darwin -filetype=obj -o - %s | macho-dump > %t
; RUN: FileCheck --check-prefix=CHECK-OBJ < %t %s
; CHECK-OBJ: ('load_commands', [
; CHECK-OBJ: # Load Command 1
; CHECK-OBJ: (('command', 45)
; CHECK-OBJ: ('size', 16)
; CHECK-OBJ: ('count', 1)
; CHECK-OBJ: ('_strings', [
; CHECK-OBJ: "-lz",
; CHECK-OBJ: ])
; CHECK-OBJ: ),
; CHECK-OBJ: # Load Command 2
; CHECK-OBJ: (('command', 45)
; CHECK-OBJ: ('size', 32)
; CHECK-OBJ: ('count', 2)
; CHECK-OBJ: ('_strings', [
; CHECK-OBJ: "-framework",
; CHECK-OBJ: "Cocoa",
; CHECK-OBJ: ])
; CHECK-OBJ: ),
; CHECK-OBJ: ])
!0 = metadata !{ i32 6, metadata !"Linker Options",
metadata !{
metadata !{ metadata !"-lz" },
metadata !{ metadata !"-framework", metadata !"Cocoa" } } }
!llvm.module.flags = !{ !0 }