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2c3a4641a7
Mips16 is really a processor decoding mode (ala thumb 1) and in the same program, mips16 and mips32 functions can exist and can call each other. If a jal type instruction encounters an address with the lower bit set, then the processor switches to mips16 mode (if it is not already in it). If the lower bit is not set, then it switches to mips32 mode. The linker knows which functions are mips16 and which are mips32. When relocation is performed on code labels, this lower order bit is set if the code label is a mips16 code label. In general this works just fine, however when creating exception handling tables and dwarf, there are cases where you don't want this lower order bit added in. This has been traditionally distinguished in gas assembly source by using a different syntax for the label. lab1: ; this will cause the lower order bit to be added lab2=. ; this will not cause the lower order bit to be added In some cases, it does not matter because in dwarf and debug tables the difference of two labels is used and in that case the lower order bits subtract each other out. To fix this, I have added to mcstreamer the notion of a debuglabel. The default is for label and debug label to be the same. So calling EmitLabel and EmitDebugLabel produce the same result. For various reasons, there is only one set of labels that needs to be modified for the mips exceptions to work. These are the "$eh_func_beginXXX" labels. Mips overrides the debug label suffix from ":" to "=." . This initial patch fixes exceptions. More changes most likely will be needed to DwarfCFException to make all of this work for actual debugging. These changes will be to emit debug labels in some places where a simple label is emitted now. Some historical discussion on this from gcc can be found at: http://gcc.gnu.org/ml/gcc-patches/2008-08/msg00623.html http://gcc.gnu.org/ml/gcc-patches/2008-11/msg01273.html git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170279 91177308-0d34-0410-b5e6-96231b3b80d8
908 lines
30 KiB
C++
908 lines
30 KiB
C++
//===-- LTOModule.cpp - LLVM Link Time Optimizer --------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Link Time Optimization library. This library is
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// intended to be used by linker to optimize code at link time.
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//
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//===----------------------------------------------------------------------===//
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#include "LTOModule.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/Constants.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCParser/MCAsmParser.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MCTargetAsmParser.h"
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#include "llvm/MC/SubtargetFeature.h"
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#include "llvm/Module.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Support/system_error.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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using namespace llvm;
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static cl::opt<bool>
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EnableFPMAD("enable-fp-mad",
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cl::desc("Enable less precise MAD instructions to be generated"),
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cl::init(false));
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static cl::opt<bool>
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DisableFPElim("disable-fp-elim",
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cl::desc("Disable frame pointer elimination optimization"),
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cl::init(false));
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static cl::opt<bool>
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DisableFPElimNonLeaf("disable-non-leaf-fp-elim",
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cl::desc("Disable frame pointer elimination optimization for non-leaf funcs"),
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cl::init(false));
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static cl::opt<bool>
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EnableUnsafeFPMath("enable-unsafe-fp-math",
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cl::desc("Enable optimizations that may decrease FP precision"),
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cl::init(false));
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static cl::opt<bool>
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EnableNoInfsFPMath("enable-no-infs-fp-math",
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cl::desc("Enable FP math optimizations that assume no +-Infs"),
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cl::init(false));
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static cl::opt<bool>
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EnableNoNaNsFPMath("enable-no-nans-fp-math",
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cl::desc("Enable FP math optimizations that assume no NaNs"),
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cl::init(false));
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static cl::opt<bool>
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EnableHonorSignDependentRoundingFPMath("enable-sign-dependent-rounding-fp-math",
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cl::Hidden,
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cl::desc("Force codegen to assume rounding mode can change dynamically"),
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cl::init(false));
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static cl::opt<bool>
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GenerateSoftFloatCalls("soft-float",
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cl::desc("Generate software floating point library calls"),
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cl::init(false));
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static cl::opt<llvm::FloatABI::ABIType>
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FloatABIForCalls("float-abi",
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cl::desc("Choose float ABI type"),
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cl::init(FloatABI::Default),
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cl::values(
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clEnumValN(FloatABI::Default, "default",
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"Target default float ABI type"),
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clEnumValN(FloatABI::Soft, "soft",
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"Soft float ABI (implied by -soft-float)"),
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clEnumValN(FloatABI::Hard, "hard",
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"Hard float ABI (uses FP registers)"),
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clEnumValEnd));
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static cl::opt<llvm::FPOpFusion::FPOpFusionMode>
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FuseFPOps("fp-contract",
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cl::desc("Enable aggresive formation of fused FP ops"),
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cl::init(FPOpFusion::Standard),
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cl::values(
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clEnumValN(FPOpFusion::Fast, "fast",
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"Fuse FP ops whenever profitable"),
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clEnumValN(FPOpFusion::Standard, "on",
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"Only fuse 'blessed' FP ops."),
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clEnumValN(FPOpFusion::Strict, "off",
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"Only fuse FP ops when the result won't be effected."),
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clEnumValEnd));
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static cl::opt<bool>
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DontPlaceZerosInBSS("nozero-initialized-in-bss",
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cl::desc("Don't place zero-initialized symbols into bss section"),
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cl::init(false));
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static cl::opt<bool>
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EnableGuaranteedTailCallOpt("tailcallopt",
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cl::desc("Turn fastcc calls into tail calls by (potentially) changing ABI."),
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cl::init(false));
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static cl::opt<bool>
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DisableTailCalls("disable-tail-calls",
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cl::desc("Never emit tail calls"),
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cl::init(false));
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static cl::opt<unsigned>
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OverrideStackAlignment("stack-alignment",
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cl::desc("Override default stack alignment"),
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cl::init(0));
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static cl::opt<bool>
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EnableRealignStack("realign-stack",
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cl::desc("Realign stack if needed"),
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cl::init(true));
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static cl::opt<std::string>
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TrapFuncName("trap-func", cl::Hidden,
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cl::desc("Emit a call to trap function rather than a trap instruction"),
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cl::init(""));
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static cl::opt<bool>
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EnablePIE("enable-pie",
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cl::desc("Assume the creation of a position independent executable."),
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cl::init(false));
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static cl::opt<bool>
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SegmentedStacks("segmented-stacks",
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cl::desc("Use segmented stacks if possible."),
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cl::init(false));
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static cl::opt<bool>
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UseInitArray("use-init-array",
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cl::desc("Use .init_array instead of .ctors."),
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cl::init(false));
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static cl::opt<unsigned>
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SSPBufferSize("stack-protector-buffer-size", cl::init(8),
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cl::desc("Lower bound for a buffer to be considered for "
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"stack protection"));
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LTOModule::LTOModule(llvm::Module *m, llvm::TargetMachine *t)
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: _module(m), _target(t),
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_context(*_target->getMCAsmInfo(), *_target->getRegisterInfo(), NULL),
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_mangler(_context, *_target->getDataLayout()) {}
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/// isBitcodeFile - Returns 'true' if the file (or memory contents) is LLVM
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/// bitcode.
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bool LTOModule::isBitcodeFile(const void *mem, size_t length) {
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return llvm::sys::IdentifyFileType((const char*)mem, length)
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== llvm::sys::Bitcode_FileType;
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}
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bool LTOModule::isBitcodeFile(const char *path) {
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return llvm::sys::Path(path).isBitcodeFile();
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}
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/// isBitcodeFileForTarget - Returns 'true' if the file (or memory contents) is
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/// LLVM bitcode for the specified triple.
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bool LTOModule::isBitcodeFileForTarget(const void *mem, size_t length,
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const char *triplePrefix) {
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MemoryBuffer *buffer = makeBuffer(mem, length);
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if (!buffer)
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return false;
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return isTargetMatch(buffer, triplePrefix);
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}
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bool LTOModule::isBitcodeFileForTarget(const char *path,
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const char *triplePrefix) {
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OwningPtr<MemoryBuffer> buffer;
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if (MemoryBuffer::getFile(path, buffer))
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return false;
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return isTargetMatch(buffer.take(), triplePrefix);
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}
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/// isTargetMatch - Returns 'true' if the memory buffer is for the specified
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/// target triple.
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bool LTOModule::isTargetMatch(MemoryBuffer *buffer, const char *triplePrefix) {
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std::string Triple = getBitcodeTargetTriple(buffer, getGlobalContext());
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delete buffer;
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return strncmp(Triple.c_str(), triplePrefix, strlen(triplePrefix)) == 0;
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}
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/// makeLTOModule - Create an LTOModule. N.B. These methods take ownership of
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/// the buffer.
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LTOModule *LTOModule::makeLTOModule(const char *path, std::string &errMsg) {
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OwningPtr<MemoryBuffer> buffer;
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if (error_code ec = MemoryBuffer::getFile(path, buffer)) {
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errMsg = ec.message();
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return NULL;
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}
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return makeLTOModule(buffer.take(), errMsg);
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}
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LTOModule *LTOModule::makeLTOModule(int fd, const char *path,
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size_t size, std::string &errMsg) {
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return makeLTOModule(fd, path, size, size, 0, errMsg);
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}
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LTOModule *LTOModule::makeLTOModule(int fd, const char *path,
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size_t file_size,
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size_t map_size,
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off_t offset,
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std::string &errMsg) {
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OwningPtr<MemoryBuffer> buffer;
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if (error_code ec = MemoryBuffer::getOpenFile(fd, path, buffer, file_size,
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map_size, offset, false)) {
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errMsg = ec.message();
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return NULL;
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}
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return makeLTOModule(buffer.take(), errMsg);
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}
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LTOModule *LTOModule::makeLTOModule(const void *mem, size_t length,
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std::string &errMsg) {
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OwningPtr<MemoryBuffer> buffer(makeBuffer(mem, length));
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if (!buffer)
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return NULL;
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return makeLTOModule(buffer.take(), errMsg);
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}
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void LTOModule::getTargetOptions(TargetOptions &Options) {
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Options.LessPreciseFPMADOption = EnableFPMAD;
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Options.NoFramePointerElim = DisableFPElim;
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Options.NoFramePointerElimNonLeaf = DisableFPElimNonLeaf;
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Options.AllowFPOpFusion = FuseFPOps;
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Options.UnsafeFPMath = EnableUnsafeFPMath;
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Options.NoInfsFPMath = EnableNoInfsFPMath;
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Options.NoNaNsFPMath = EnableNoNaNsFPMath;
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Options.HonorSignDependentRoundingFPMathOption =
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EnableHonorSignDependentRoundingFPMath;
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Options.UseSoftFloat = GenerateSoftFloatCalls;
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if (FloatABIForCalls != FloatABI::Default)
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Options.FloatABIType = FloatABIForCalls;
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Options.NoZerosInBSS = DontPlaceZerosInBSS;
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Options.GuaranteedTailCallOpt = EnableGuaranteedTailCallOpt;
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Options.DisableTailCalls = DisableTailCalls;
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Options.StackAlignmentOverride = OverrideStackAlignment;
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Options.RealignStack = EnableRealignStack;
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Options.TrapFuncName = TrapFuncName;
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Options.PositionIndependentExecutable = EnablePIE;
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Options.EnableSegmentedStacks = SegmentedStacks;
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Options.UseInitArray = UseInitArray;
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Options.SSPBufferSize = SSPBufferSize;
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}
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LTOModule *LTOModule::makeLTOModule(MemoryBuffer *buffer,
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std::string &errMsg) {
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static bool Initialized = false;
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if (!Initialized) {
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InitializeAllTargets();
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InitializeAllTargetMCs();
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InitializeAllAsmParsers();
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Initialized = true;
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}
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// parse bitcode buffer
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OwningPtr<Module> m(getLazyBitcodeModule(buffer, getGlobalContext(),
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&errMsg));
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if (!m) {
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delete buffer;
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return NULL;
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}
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std::string TripleStr = m->getTargetTriple();
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if (TripleStr.empty())
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TripleStr = sys::getDefaultTargetTriple();
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llvm::Triple Triple(TripleStr);
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// find machine architecture for this module
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const Target *march = TargetRegistry::lookupTarget(TripleStr, errMsg);
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if (!march)
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return NULL;
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// construct LTOModule, hand over ownership of module and target
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SubtargetFeatures Features;
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Features.getDefaultSubtargetFeatures(Triple);
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std::string FeatureStr = Features.getString();
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// Set a default CPU for Darwin triples.
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std::string CPU;
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if (Triple.isOSDarwin()) {
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if (Triple.getArch() == llvm::Triple::x86_64)
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CPU = "core2";
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else if (Triple.getArch() == llvm::Triple::x86)
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CPU = "yonah";
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}
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TargetOptions Options;
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getTargetOptions(Options);
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TargetMachine *target = march->createTargetMachine(TripleStr, CPU, FeatureStr,
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Options);
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LTOModule *Ret = new LTOModule(m.take(), target);
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if (Ret->parseSymbols(errMsg)) {
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delete Ret;
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return NULL;
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}
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return Ret;
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}
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/// makeBuffer - Create a MemoryBuffer from a memory range.
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MemoryBuffer *LTOModule::makeBuffer(const void *mem, size_t length) {
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const char *startPtr = (const char*)mem;
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return MemoryBuffer::getMemBuffer(StringRef(startPtr, length), "", false);
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}
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/// objcClassNameFromExpression - Get string that the data pointer points to.
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bool
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LTOModule::objcClassNameFromExpression(const Constant *c, std::string &name) {
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if (const ConstantExpr *ce = dyn_cast<ConstantExpr>(c)) {
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Constant *op = ce->getOperand(0);
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if (GlobalVariable *gvn = dyn_cast<GlobalVariable>(op)) {
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Constant *cn = gvn->getInitializer();
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if (ConstantDataArray *ca = dyn_cast<ConstantDataArray>(cn)) {
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if (ca->isCString()) {
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name = ".objc_class_name_" + ca->getAsCString().str();
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return true;
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}
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}
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}
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}
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return false;
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}
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/// addObjCClass - Parse i386/ppc ObjC class data structure.
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void LTOModule::addObjCClass(const GlobalVariable *clgv) {
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const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
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if (!c) return;
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// second slot in __OBJC,__class is pointer to superclass name
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std::string superclassName;
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if (objcClassNameFromExpression(c->getOperand(1), superclassName)) {
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NameAndAttributes info;
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StringMap<NameAndAttributes>::value_type &entry =
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_undefines.GetOrCreateValue(superclassName);
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if (!entry.getValue().name) {
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const char *symbolName = entry.getKey().data();
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info.name = symbolName;
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info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
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info.isFunction = false;
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info.symbol = clgv;
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entry.setValue(info);
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}
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}
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// third slot in __OBJC,__class is pointer to class name
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std::string className;
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if (objcClassNameFromExpression(c->getOperand(2), className)) {
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StringSet::value_type &entry = _defines.GetOrCreateValue(className);
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entry.setValue(1);
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NameAndAttributes info;
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info.name = entry.getKey().data();
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info.attributes = LTO_SYMBOL_PERMISSIONS_DATA |
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LTO_SYMBOL_DEFINITION_REGULAR | LTO_SYMBOL_SCOPE_DEFAULT;
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info.isFunction = false;
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info.symbol = clgv;
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_symbols.push_back(info);
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}
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}
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/// addObjCCategory - Parse i386/ppc ObjC category data structure.
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void LTOModule::addObjCCategory(const GlobalVariable *clgv) {
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const ConstantStruct *c = dyn_cast<ConstantStruct>(clgv->getInitializer());
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if (!c) return;
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// second slot in __OBJC,__category is pointer to target class name
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std::string targetclassName;
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if (!objcClassNameFromExpression(c->getOperand(1), targetclassName))
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return;
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NameAndAttributes info;
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StringMap<NameAndAttributes>::value_type &entry =
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_undefines.GetOrCreateValue(targetclassName);
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if (entry.getValue().name)
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return;
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const char *symbolName = entry.getKey().data();
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info.name = symbolName;
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info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
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info.isFunction = false;
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info.symbol = clgv;
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entry.setValue(info);
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}
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/// addObjCClassRef - Parse i386/ppc ObjC class list data structure.
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void LTOModule::addObjCClassRef(const GlobalVariable *clgv) {
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std::string targetclassName;
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if (!objcClassNameFromExpression(clgv->getInitializer(), targetclassName))
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return;
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NameAndAttributes info;
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StringMap<NameAndAttributes>::value_type &entry =
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_undefines.GetOrCreateValue(targetclassName);
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if (entry.getValue().name)
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return;
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const char *symbolName = entry.getKey().data();
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info.name = symbolName;
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info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
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info.isFunction = false;
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info.symbol = clgv;
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entry.setValue(info);
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}
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/// addDefinedDataSymbol - Add a data symbol as defined to the list.
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void LTOModule::addDefinedDataSymbol(const GlobalValue *v) {
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// Add to list of defined symbols.
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addDefinedSymbol(v, false);
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if (!v->hasSection() /* || !isTargetDarwin */)
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return;
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// Special case i386/ppc ObjC data structures in magic sections:
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// The issue is that the old ObjC object format did some strange
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// contortions to avoid real linker symbols. For instance, the
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// ObjC class data structure is allocated statically in the executable
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// that defines that class. That data structures contains a pointer to
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// its superclass. But instead of just initializing that part of the
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// struct to the address of its superclass, and letting the static and
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// dynamic linkers do the rest, the runtime works by having that field
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// instead point to a C-string that is the name of the superclass.
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// At runtime the objc initialization updates that pointer and sets
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// it to point to the actual super class. As far as the linker
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// knows it is just a pointer to a string. But then someone wanted the
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// linker to issue errors at build time if the superclass was not found.
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// So they figured out a way in mach-o object format to use an absolute
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// symbols (.objc_class_name_Foo = 0) and a floating reference
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// (.reference .objc_class_name_Bar) to cause the linker into erroring when
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|
// a class was missing.
|
|
// The following synthesizes the implicit .objc_* symbols for the linker
|
|
// from the ObjC data structures generated by the front end.
|
|
|
|
// special case if this data blob is an ObjC class definition
|
|
if (v->getSection().compare(0, 15, "__OBJC,__class,") == 0) {
|
|
if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
|
|
addObjCClass(gv);
|
|
}
|
|
}
|
|
|
|
// special case if this data blob is an ObjC category definition
|
|
else if (v->getSection().compare(0, 18, "__OBJC,__category,") == 0) {
|
|
if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
|
|
addObjCCategory(gv);
|
|
}
|
|
}
|
|
|
|
// special case if this data blob is the list of referenced classes
|
|
else if (v->getSection().compare(0, 18, "__OBJC,__cls_refs,") == 0) {
|
|
if (const GlobalVariable *gv = dyn_cast<GlobalVariable>(v)) {
|
|
addObjCClassRef(gv);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// addDefinedFunctionSymbol - Add a function symbol as defined to the list.
|
|
void LTOModule::addDefinedFunctionSymbol(const Function *f) {
|
|
// add to list of defined symbols
|
|
addDefinedSymbol(f, true);
|
|
}
|
|
|
|
/// addDefinedSymbol - Add a defined symbol to the list.
|
|
void LTOModule::addDefinedSymbol(const GlobalValue *def, bool isFunction) {
|
|
// ignore all llvm.* symbols
|
|
if (def->getName().startswith("llvm."))
|
|
return;
|
|
|
|
// string is owned by _defines
|
|
SmallString<64> Buffer;
|
|
_mangler.getNameWithPrefix(Buffer, def, false);
|
|
|
|
// set alignment part log2() can have rounding errors
|
|
uint32_t align = def->getAlignment();
|
|
uint32_t attr = align ? CountTrailingZeros_32(def->getAlignment()) : 0;
|
|
|
|
// set permissions part
|
|
if (isFunction) {
|
|
attr |= LTO_SYMBOL_PERMISSIONS_CODE;
|
|
} else {
|
|
const GlobalVariable *gv = dyn_cast<GlobalVariable>(def);
|
|
if (gv && gv->isConstant())
|
|
attr |= LTO_SYMBOL_PERMISSIONS_RODATA;
|
|
else
|
|
attr |= LTO_SYMBOL_PERMISSIONS_DATA;
|
|
}
|
|
|
|
// set definition part
|
|
if (def->hasWeakLinkage() || def->hasLinkOnceLinkage() ||
|
|
def->hasLinkerPrivateWeakLinkage())
|
|
attr |= LTO_SYMBOL_DEFINITION_WEAK;
|
|
else if (def->hasCommonLinkage())
|
|
attr |= LTO_SYMBOL_DEFINITION_TENTATIVE;
|
|
else
|
|
attr |= LTO_SYMBOL_DEFINITION_REGULAR;
|
|
|
|
// set scope part
|
|
if (def->hasHiddenVisibility())
|
|
attr |= LTO_SYMBOL_SCOPE_HIDDEN;
|
|
else if (def->hasProtectedVisibility())
|
|
attr |= LTO_SYMBOL_SCOPE_PROTECTED;
|
|
else if (def->hasExternalLinkage() || def->hasWeakLinkage() ||
|
|
def->hasLinkOnceLinkage() || def->hasCommonLinkage() ||
|
|
def->hasLinkerPrivateWeakLinkage())
|
|
attr |= LTO_SYMBOL_SCOPE_DEFAULT;
|
|
else if (def->hasLinkOnceODRAutoHideLinkage())
|
|
attr |= LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN;
|
|
else
|
|
attr |= LTO_SYMBOL_SCOPE_INTERNAL;
|
|
|
|
StringSet::value_type &entry = _defines.GetOrCreateValue(Buffer);
|
|
entry.setValue(1);
|
|
|
|
// fill information structure
|
|
NameAndAttributes info;
|
|
StringRef Name = entry.getKey();
|
|
info.name = Name.data();
|
|
assert(info.name[Name.size()] == '\0');
|
|
info.attributes = attr;
|
|
info.isFunction = isFunction;
|
|
info.symbol = def;
|
|
|
|
// add to table of symbols
|
|
_symbols.push_back(info);
|
|
}
|
|
|
|
/// addAsmGlobalSymbol - Add a global symbol from module-level ASM to the
|
|
/// defined list.
|
|
void LTOModule::addAsmGlobalSymbol(const char *name,
|
|
lto_symbol_attributes scope) {
|
|
StringSet::value_type &entry = _defines.GetOrCreateValue(name);
|
|
|
|
// only add new define if not already defined
|
|
if (entry.getValue())
|
|
return;
|
|
|
|
entry.setValue(1);
|
|
|
|
NameAndAttributes &info = _undefines[entry.getKey().data()];
|
|
|
|
if (info.symbol == 0) {
|
|
// FIXME: This is trying to take care of module ASM like this:
|
|
//
|
|
// module asm ".zerofill __FOO, __foo, _bar_baz_qux, 0"
|
|
//
|
|
// but is gross and its mother dresses it funny. Have the ASM parser give us
|
|
// more details for this type of situation so that we're not guessing so
|
|
// much.
|
|
|
|
// fill information structure
|
|
info.name = entry.getKey().data();
|
|
info.attributes =
|
|
LTO_SYMBOL_PERMISSIONS_DATA | LTO_SYMBOL_DEFINITION_REGULAR | scope;
|
|
info.isFunction = false;
|
|
info.symbol = 0;
|
|
|
|
// add to table of symbols
|
|
_symbols.push_back(info);
|
|
return;
|
|
}
|
|
|
|
if (info.isFunction)
|
|
addDefinedFunctionSymbol(cast<Function>(info.symbol));
|
|
else
|
|
addDefinedDataSymbol(info.symbol);
|
|
|
|
_symbols.back().attributes &= ~LTO_SYMBOL_SCOPE_MASK;
|
|
_symbols.back().attributes |= scope;
|
|
}
|
|
|
|
/// addAsmGlobalSymbolUndef - Add a global symbol from module-level ASM to the
|
|
/// undefined list.
|
|
void LTOModule::addAsmGlobalSymbolUndef(const char *name) {
|
|
StringMap<NameAndAttributes>::value_type &entry =
|
|
_undefines.GetOrCreateValue(name);
|
|
|
|
_asm_undefines.push_back(entry.getKey().data());
|
|
|
|
// we already have the symbol
|
|
if (entry.getValue().name)
|
|
return;
|
|
|
|
uint32_t attr = LTO_SYMBOL_DEFINITION_UNDEFINED;;
|
|
attr |= LTO_SYMBOL_SCOPE_DEFAULT;
|
|
NameAndAttributes info;
|
|
info.name = entry.getKey().data();
|
|
info.attributes = attr;
|
|
info.isFunction = false;
|
|
info.symbol = 0;
|
|
|
|
entry.setValue(info);
|
|
}
|
|
|
|
/// addPotentialUndefinedSymbol - Add a symbol which isn't defined just yet to a
|
|
/// list to be resolved later.
|
|
void
|
|
LTOModule::addPotentialUndefinedSymbol(const GlobalValue *decl, bool isFunc) {
|
|
// ignore all llvm.* symbols
|
|
if (decl->getName().startswith("llvm."))
|
|
return;
|
|
|
|
// ignore all aliases
|
|
if (isa<GlobalAlias>(decl))
|
|
return;
|
|
|
|
SmallString<64> name;
|
|
_mangler.getNameWithPrefix(name, decl, false);
|
|
|
|
StringMap<NameAndAttributes>::value_type &entry =
|
|
_undefines.GetOrCreateValue(name);
|
|
|
|
// we already have the symbol
|
|
if (entry.getValue().name)
|
|
return;
|
|
|
|
NameAndAttributes info;
|
|
|
|
info.name = entry.getKey().data();
|
|
|
|
if (decl->hasExternalWeakLinkage())
|
|
info.attributes = LTO_SYMBOL_DEFINITION_WEAKUNDEF;
|
|
else
|
|
info.attributes = LTO_SYMBOL_DEFINITION_UNDEFINED;
|
|
|
|
info.isFunction = isFunc;
|
|
info.symbol = decl;
|
|
|
|
entry.setValue(info);
|
|
}
|
|
|
|
namespace {
|
|
class RecordStreamer : public MCStreamer {
|
|
public:
|
|
enum State { NeverSeen, Global, Defined, DefinedGlobal, Used };
|
|
|
|
private:
|
|
StringMap<State> Symbols;
|
|
|
|
void markDefined(const MCSymbol &Symbol) {
|
|
State &S = Symbols[Symbol.getName()];
|
|
switch (S) {
|
|
case DefinedGlobal:
|
|
case Global:
|
|
S = DefinedGlobal;
|
|
break;
|
|
case NeverSeen:
|
|
case Defined:
|
|
case Used:
|
|
S = Defined;
|
|
break;
|
|
}
|
|
}
|
|
void markGlobal(const MCSymbol &Symbol) {
|
|
State &S = Symbols[Symbol.getName()];
|
|
switch (S) {
|
|
case DefinedGlobal:
|
|
case Defined:
|
|
S = DefinedGlobal;
|
|
break;
|
|
|
|
case NeverSeen:
|
|
case Global:
|
|
case Used:
|
|
S = Global;
|
|
break;
|
|
}
|
|
}
|
|
void markUsed(const MCSymbol &Symbol) {
|
|
State &S = Symbols[Symbol.getName()];
|
|
switch (S) {
|
|
case DefinedGlobal:
|
|
case Defined:
|
|
case Global:
|
|
break;
|
|
|
|
case NeverSeen:
|
|
case Used:
|
|
S = Used;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// FIXME: mostly copied for the obj streamer.
|
|
void AddValueSymbols(const MCExpr *Value) {
|
|
switch (Value->getKind()) {
|
|
case MCExpr::Target:
|
|
// FIXME: What should we do in here?
|
|
break;
|
|
|
|
case MCExpr::Constant:
|
|
break;
|
|
|
|
case MCExpr::Binary: {
|
|
const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
|
|
AddValueSymbols(BE->getLHS());
|
|
AddValueSymbols(BE->getRHS());
|
|
break;
|
|
}
|
|
|
|
case MCExpr::SymbolRef:
|
|
markUsed(cast<MCSymbolRefExpr>(Value)->getSymbol());
|
|
break;
|
|
|
|
case MCExpr::Unary:
|
|
AddValueSymbols(cast<MCUnaryExpr>(Value)->getSubExpr());
|
|
break;
|
|
}
|
|
}
|
|
|
|
public:
|
|
typedef StringMap<State>::const_iterator const_iterator;
|
|
|
|
const_iterator begin() {
|
|
return Symbols.begin();
|
|
}
|
|
|
|
const_iterator end() {
|
|
return Symbols.end();
|
|
}
|
|
|
|
RecordStreamer(MCContext &Context) : MCStreamer(Context) {}
|
|
|
|
virtual void EmitInstruction(const MCInst &Inst) {
|
|
// Scan for values.
|
|
for (unsigned i = Inst.getNumOperands(); i--; )
|
|
if (Inst.getOperand(i).isExpr())
|
|
AddValueSymbols(Inst.getOperand(i).getExpr());
|
|
}
|
|
virtual void EmitLabel(MCSymbol *Symbol) {
|
|
Symbol->setSection(*getCurrentSection());
|
|
markDefined(*Symbol);
|
|
}
|
|
virtual void EmitDebugLabel(MCSymbol *Symbol) {
|
|
EmitLabel(Symbol);
|
|
}
|
|
virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
|
|
// FIXME: should we handle aliases?
|
|
markDefined(*Symbol);
|
|
}
|
|
virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) {
|
|
if (Attribute == MCSA_Global)
|
|
markGlobal(*Symbol);
|
|
}
|
|
virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
|
|
uint64_t Size , unsigned ByteAlignment) {
|
|
markDefined(*Symbol);
|
|
}
|
|
virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
|
|
unsigned ByteAlignment) {
|
|
markDefined(*Symbol);
|
|
}
|
|
|
|
// Noop calls.
|
|
virtual void ChangeSection(const MCSection *Section) {}
|
|
virtual void InitSections() {}
|
|
virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) {}
|
|
virtual void EmitThumbFunc(MCSymbol *Func) {}
|
|
virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
|
|
virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
|
|
virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
|
|
virtual void EmitCOFFSymbolStorageClass(int StorageClass) {}
|
|
virtual void EmitCOFFSymbolType(int Type) {}
|
|
virtual void EndCOFFSymbolDef() {}
|
|
virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
|
|
virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
|
|
unsigned ByteAlignment) {}
|
|
virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
|
|
uint64_t Size, unsigned ByteAlignment) {}
|
|
virtual void EmitBytes(StringRef Data, unsigned AddrSpace) {}
|
|
virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
|
|
unsigned AddrSpace) {}
|
|
virtual void EmitULEB128Value(const MCExpr *Value) {}
|
|
virtual void EmitSLEB128Value(const MCExpr *Value) {}
|
|
virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
|
|
unsigned ValueSize,
|
|
unsigned MaxBytesToEmit) {}
|
|
virtual void EmitCodeAlignment(unsigned ByteAlignment,
|
|
unsigned MaxBytesToEmit) {}
|
|
virtual bool EmitValueToOffset(const MCExpr *Offset,
|
|
unsigned char Value ) { return false; }
|
|
virtual void EmitFileDirective(StringRef Filename) {}
|
|
virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
|
|
const MCSymbol *LastLabel,
|
|
const MCSymbol *Label,
|
|
unsigned PointerSize) {}
|
|
virtual void FinishImpl() {}
|
|
};
|
|
} // end anonymous namespace
|
|
|
|
/// addAsmGlobalSymbols - Add global symbols from module-level ASM to the
|
|
/// defined or undefined lists.
|
|
bool LTOModule::addAsmGlobalSymbols(std::string &errMsg) {
|
|
const std::string &inlineAsm = _module->getModuleInlineAsm();
|
|
if (inlineAsm.empty())
|
|
return false;
|
|
|
|
OwningPtr<RecordStreamer> Streamer(new RecordStreamer(_context));
|
|
MemoryBuffer *Buffer = MemoryBuffer::getMemBuffer(inlineAsm);
|
|
SourceMgr SrcMgr;
|
|
SrcMgr.AddNewSourceBuffer(Buffer, SMLoc());
|
|
OwningPtr<MCAsmParser> Parser(createMCAsmParser(SrcMgr,
|
|
_context, *Streamer,
|
|
*_target->getMCAsmInfo()));
|
|
const Target &T = _target->getTarget();
|
|
OwningPtr<MCSubtargetInfo>
|
|
STI(T.createMCSubtargetInfo(_target->getTargetTriple(),
|
|
_target->getTargetCPU(),
|
|
_target->getTargetFeatureString()));
|
|
OwningPtr<MCTargetAsmParser> TAP(T.createMCAsmParser(*STI, *Parser.get()));
|
|
if (!TAP) {
|
|
errMsg = "target " + std::string(T.getName()) +
|
|
" does not define AsmParser.";
|
|
return true;
|
|
}
|
|
|
|
Parser->setTargetParser(*TAP);
|
|
if (Parser->Run(false))
|
|
return true;
|
|
|
|
for (RecordStreamer::const_iterator i = Streamer->begin(),
|
|
e = Streamer->end(); i != e; ++i) {
|
|
StringRef Key = i->first();
|
|
RecordStreamer::State Value = i->second;
|
|
if (Value == RecordStreamer::DefinedGlobal)
|
|
addAsmGlobalSymbol(Key.data(), LTO_SYMBOL_SCOPE_DEFAULT);
|
|
else if (Value == RecordStreamer::Defined)
|
|
addAsmGlobalSymbol(Key.data(), LTO_SYMBOL_SCOPE_INTERNAL);
|
|
else if (Value == RecordStreamer::Global ||
|
|
Value == RecordStreamer::Used)
|
|
addAsmGlobalSymbolUndef(Key.data());
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/// isDeclaration - Return 'true' if the global value is a declaration.
|
|
static bool isDeclaration(const GlobalValue &V) {
|
|
if (V.hasAvailableExternallyLinkage())
|
|
return true;
|
|
|
|
if (V.isMaterializable())
|
|
return false;
|
|
|
|
return V.isDeclaration();
|
|
}
|
|
|
|
/// parseSymbols - Parse the symbols from the module and model-level ASM and add
|
|
/// them to either the defined or undefined lists.
|
|
bool LTOModule::parseSymbols(std::string &errMsg) {
|
|
// add functions
|
|
for (Module::iterator f = _module->begin(), e = _module->end(); f != e; ++f) {
|
|
if (isDeclaration(*f))
|
|
addPotentialUndefinedSymbol(f, true);
|
|
else
|
|
addDefinedFunctionSymbol(f);
|
|
}
|
|
|
|
// add data
|
|
for (Module::global_iterator v = _module->global_begin(),
|
|
e = _module->global_end(); v != e; ++v) {
|
|
if (isDeclaration(*v))
|
|
addPotentialUndefinedSymbol(v, false);
|
|
else
|
|
addDefinedDataSymbol(v);
|
|
}
|
|
|
|
// add asm globals
|
|
if (addAsmGlobalSymbols(errMsg))
|
|
return true;
|
|
|
|
// add aliases
|
|
for (Module::alias_iterator a = _module->alias_begin(),
|
|
e = _module->alias_end(); a != e; ++a) {
|
|
if (isDeclaration(*a->getAliasedGlobal()))
|
|
// Is an alias to a declaration.
|
|
addPotentialUndefinedSymbol(a, false);
|
|
else
|
|
addDefinedDataSymbol(a);
|
|
}
|
|
|
|
// make symbols for all undefines
|
|
for (StringMap<NameAndAttributes>::iterator u =_undefines.begin(),
|
|
e = _undefines.end(); u != e; ++u) {
|
|
// If this symbol also has a definition, then don't make an undefine because
|
|
// it is a tentative definition.
|
|
if (_defines.count(u->getKey())) continue;
|
|
NameAndAttributes info = u->getValue();
|
|
_symbols.push_back(info);
|
|
}
|
|
|
|
return false;
|
|
}
|