start straightening out libedis's dependencies and make it fit
better in the llvm world. Among other things, this changes:
1. The guts of libedis are now moved into lib/MC/MCDisassembler
2. llvm-mc now depends on lib/MC/MCDisassembler, not tools/edis,
so edis and mc don't have to be built in series.
3. lib/MC/MCDisassembler no longer depends on the C api, the C
API depends on it.
4. Various code cleanup changes.
There is still a lot to be done to make edis fit with the llvm
design, but this is an incremental step in the right direction.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108869 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCDisassembler/EDDisassembler.cpp b/lib/MC/MCDisassembler/EDDisassembler.cpp
new file mode 100644
index 0000000..697b3d9
--- /dev/null
+++ b/lib/MC/MCDisassembler/EDDisassembler.cpp
@@ -0,0 +1,402 @@
+//===-EDDisassembler.cpp - LLVM Enhanced Disassembler ---------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Enhanced Disassembly library's disassembler class.
+// The disassembler is responsible for vending individual instructions according
+// to a given architecture and disassembly syntax.
+//
+//===----------------------------------------------------------------------===//
+
+#include "EDDisassembler.h"
+#include "EDInst.h"
+#include "llvm/MC/EDInstInfo.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCDisassembler.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCInstPrinter.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCParser/AsmLexer.h"
+#include "llvm/MC/MCParser/MCAsmParser.h"
+#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/MemoryObject.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Target/TargetAsmLexer.h"
+#include "llvm/Target/TargetAsmParser.h"
+#include "llvm/Target/TargetRegistry.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Target/TargetSelect.h"
+using namespace llvm;
+
+bool EDDisassembler::sInitialized = false;
+EDDisassembler::DisassemblerMap_t EDDisassembler::sDisassemblers;
+
+struct TripleMap {
+ Triple::ArchType Arch;
+ const char *String;
+};
+
+static struct TripleMap triplemap[] = {
+ { Triple::x86, "i386-unknown-unknown" },
+ { Triple::x86_64, "x86_64-unknown-unknown" },
+ { Triple::arm, "arm-unknown-unknown" },
+ { Triple::thumb, "thumb-unknown-unknown" },
+ { Triple::InvalidArch, NULL, }
+};
+
+/// infoFromArch - Returns the TripleMap corresponding to a given architecture,
+/// or NULL if there is an error
+///
+/// @arg arch - The Triple::ArchType for the desired architecture
+static const char *tripleFromArch(Triple::ArchType arch) {
+ unsigned int infoIndex;
+
+ for (infoIndex = 0; triplemap[infoIndex].String != NULL; ++infoIndex) {
+ if (arch == triplemap[infoIndex].Arch)
+ return triplemap[infoIndex].String;
+ }
+
+ return NULL;
+}
+
+/// getLLVMSyntaxVariant - gets the constant to use to get an assembly printer
+/// for the desired assembly syntax, suitable for passing to
+/// Target::createMCInstPrinter()
+///
+/// @arg arch - The target architecture
+/// @arg syntax - The assembly syntax in sd form
+static int getLLVMSyntaxVariant(Triple::ArchType arch,
+ EDDisassembler::AssemblySyntax syntax) {
+ switch (syntax) {
+ default:
+ return -1;
+ // Mappings below from X86AsmPrinter.cpp
+ case EDDisassembler::kEDAssemblySyntaxX86ATT:
+ if (arch == Triple::x86 || arch == Triple::x86_64)
+ return 0;
+ else
+ return -1;
+ case EDDisassembler::kEDAssemblySyntaxX86Intel:
+ if (arch == Triple::x86 || arch == Triple::x86_64)
+ return 1;
+ else
+ return -1;
+ case EDDisassembler::kEDAssemblySyntaxARMUAL:
+ if (arch == Triple::arm || arch == Triple::thumb)
+ return 0;
+ else
+ return -1;
+ }
+}
+
+void EDDisassembler::initialize() {
+ if (sInitialized)
+ return;
+
+ sInitialized = true;
+
+ InitializeAllTargetInfos();
+ InitializeAllTargets();
+ InitializeAllAsmPrinters();
+ InitializeAllAsmParsers();
+ InitializeAllDisassemblers();
+}
+
+#undef BRINGUP_TARGET
+
+EDDisassembler *EDDisassembler::getDisassembler(Triple::ArchType arch,
+ AssemblySyntax syntax) {
+ CPUKey key;
+ key.Arch = arch;
+ key.Syntax = syntax;
+
+ EDDisassembler::DisassemblerMap_t::iterator i = sDisassemblers.find(key);
+
+ if (i != sDisassemblers.end()) {
+ return i->second;
+ } else {
+ EDDisassembler* sdd = new EDDisassembler(key);
+ if (!sdd->valid()) {
+ delete sdd;
+ return NULL;
+ }
+
+ sDisassemblers[key] = sdd;
+
+ return sdd;
+ }
+
+ return NULL;
+}
+
+EDDisassembler *EDDisassembler::getDisassembler(StringRef str,
+ AssemblySyntax syntax) {
+ return getDisassembler(Triple(str).getArch(), syntax);
+}
+
+EDDisassembler::EDDisassembler(CPUKey &key) :
+ Valid(false),
+ HasSemantics(false),
+ ErrorStream(nulls()),
+ Key(key) {
+ const char *triple = tripleFromArch(key.Arch);
+
+ if (!triple)
+ return;
+
+ LLVMSyntaxVariant = getLLVMSyntaxVariant(key.Arch, key.Syntax);
+
+ if (LLVMSyntaxVariant < 0)
+ return;
+
+ std::string tripleString(triple);
+ std::string errorString;
+
+ Tgt = TargetRegistry::lookupTarget(tripleString,
+ errorString);
+
+ if (!Tgt)
+ return;
+
+ std::string featureString;
+
+ TargetMachine.reset(Tgt->createTargetMachine(tripleString,
+ featureString));
+
+ const TargetRegisterInfo *registerInfo = TargetMachine->getRegisterInfo();
+
+ if (!registerInfo)
+ return;
+
+ initMaps(*registerInfo);
+
+ AsmInfo.reset(Tgt->createAsmInfo(tripleString));
+
+ if (!AsmInfo)
+ return;
+
+ Disassembler.reset(Tgt->createMCDisassembler());
+
+ if (!Disassembler)
+ return;
+
+ InstInfos = Disassembler->getEDInfo();
+
+ InstString.reset(new std::string);
+ InstStream.reset(new raw_string_ostream(*InstString));
+ InstPrinter.reset(Tgt->createMCInstPrinter(LLVMSyntaxVariant, *AsmInfo));
+
+ if (!InstPrinter)
+ return;
+
+ GenericAsmLexer.reset(new AsmLexer(*AsmInfo));
+ SpecificAsmLexer.reset(Tgt->createAsmLexer(*AsmInfo));
+ SpecificAsmLexer->InstallLexer(*GenericAsmLexer);
+
+ initMaps(*TargetMachine->getRegisterInfo());
+
+ Valid = true;
+}
+
+EDDisassembler::~EDDisassembler() {
+ if (!valid())
+ return;
+}
+
+namespace {
+ /// EDMemoryObject - a subclass of MemoryObject that allows use of a callback
+ /// as provided by the sd interface. See MemoryObject.
+ class EDMemoryObject : public llvm::MemoryObject {
+ private:
+ EDByteReaderCallback Callback;
+ void *Arg;
+ public:
+ EDMemoryObject(EDByteReaderCallback callback,
+ void *arg) : Callback(callback), Arg(arg) { }
+ ~EDMemoryObject() { }
+ uint64_t getBase() const { return 0x0; }
+ uint64_t getExtent() const { return (uint64_t)-1; }
+ int readByte(uint64_t address, uint8_t *ptr) const {
+ if (!Callback)
+ return -1;
+
+ if (Callback(ptr, address, Arg))
+ return -1;
+
+ return 0;
+ }
+ };
+}
+
+EDInst *EDDisassembler::createInst(EDByteReaderCallback byteReader,
+ uint64_t address,
+ void *arg) {
+ EDMemoryObject memoryObject(byteReader, arg);
+
+ MCInst* inst = new MCInst;
+ uint64_t byteSize;
+
+ if (!Disassembler->getInstruction(*inst,
+ byteSize,
+ memoryObject,
+ address,
+ ErrorStream)) {
+ delete inst;
+ return NULL;
+ } else {
+ const llvm::EDInstInfo *thisInstInfo;
+
+ thisInstInfo = &InstInfos[inst->getOpcode()];
+
+ EDInst* sdInst = new EDInst(inst, byteSize, *this, thisInstInfo);
+ return sdInst;
+ }
+}
+
+void EDDisassembler::initMaps(const TargetRegisterInfo ®isterInfo) {
+ unsigned numRegisters = registerInfo.getNumRegs();
+ unsigned registerIndex;
+
+ for (registerIndex = 0; registerIndex < numRegisters; ++registerIndex) {
+ const char* registerName = registerInfo.get(registerIndex).Name;
+
+ RegVec.push_back(registerName);
+ RegRMap[registerName] = registerIndex;
+ }
+
+ switch (Key.Arch) {
+ default:
+ break;
+ case Triple::x86:
+ case Triple::x86_64:
+ stackPointers.insert(registerIDWithName("SP"));
+ stackPointers.insert(registerIDWithName("ESP"));
+ stackPointers.insert(registerIDWithName("RSP"));
+
+ programCounters.insert(registerIDWithName("IP"));
+ programCounters.insert(registerIDWithName("EIP"));
+ programCounters.insert(registerIDWithName("RIP"));
+ break;
+ case Triple::arm:
+ case Triple::thumb:
+ stackPointers.insert(registerIDWithName("SP"));
+
+ programCounters.insert(registerIDWithName("PC"));
+ break;
+ }
+}
+
+const char *EDDisassembler::nameWithRegisterID(unsigned registerID) const {
+ if (registerID >= RegVec.size())
+ return NULL;
+ else
+ return RegVec[registerID].c_str();
+}
+
+unsigned EDDisassembler::registerIDWithName(const char *name) const {
+ regrmap_t::const_iterator iter = RegRMap.find(std::string(name));
+ if (iter == RegRMap.end())
+ return 0;
+ else
+ return (*iter).second;
+}
+
+bool EDDisassembler::registerIsStackPointer(unsigned registerID) {
+ return (stackPointers.find(registerID) != stackPointers.end());
+}
+
+bool EDDisassembler::registerIsProgramCounter(unsigned registerID) {
+ return (programCounters.find(registerID) != programCounters.end());
+}
+
+int EDDisassembler::printInst(std::string &str, MCInst &inst) {
+ PrinterMutex.acquire();
+
+ InstPrinter->printInst(&inst, *InstStream);
+ InstStream->flush();
+ str = *InstString;
+ InstString->clear();
+
+ PrinterMutex.release();
+
+ return 0;
+}
+
+int EDDisassembler::parseInst(SmallVectorImpl<MCParsedAsmOperand*> &operands,
+ SmallVectorImpl<AsmToken> &tokens,
+ const std::string &str) {
+ int ret = 0;
+
+ switch (Key.Arch) {
+ default:
+ return -1;
+ case Triple::x86:
+ case Triple::x86_64:
+ case Triple::arm:
+ case Triple::thumb:
+ break;
+ }
+
+ const char *cStr = str.c_str();
+ MemoryBuffer *buf = MemoryBuffer::getMemBuffer(cStr, cStr + strlen(cStr));
+
+ StringRef instName;
+ SMLoc instLoc;
+
+ SourceMgr sourceMgr;
+ sourceMgr.AddNewSourceBuffer(buf, SMLoc()); // ownership of buf handed over
+ MCContext context(*AsmInfo);
+ OwningPtr<MCStreamer> streamer(createNullStreamer(context));
+ OwningPtr<MCAsmParser> genericParser(createMCAsmParser(*Tgt, sourceMgr,
+ context, *streamer,
+ *AsmInfo));
+ OwningPtr<TargetAsmParser> TargetParser(Tgt->createAsmParser(*genericParser,
+ *TargetMachine));
+
+ AsmToken OpcodeToken = genericParser->Lex();
+ AsmToken NextToken = genericParser->Lex(); // consume next token, because specificParser expects us to
+
+ if (OpcodeToken.is(AsmToken::Identifier)) {
+ instName = OpcodeToken.getString();
+ instLoc = OpcodeToken.getLoc();
+
+ if (NextToken.isNot(AsmToken::Eof) &&
+ TargetParser->ParseInstruction(instName, instLoc, operands))
+ ret = -1;
+ } else {
+ ret = -1;
+ }
+
+ ParserMutex.acquire();
+
+ if (!ret) {
+ GenericAsmLexer->setBuffer(buf);
+
+ while (SpecificAsmLexer->Lex(),
+ SpecificAsmLexer->isNot(AsmToken::Eof) &&
+ SpecificAsmLexer->isNot(AsmToken::EndOfStatement)) {
+ if (SpecificAsmLexer->is(AsmToken::Error)) {
+ ret = -1;
+ break;
+ }
+ tokens.push_back(SpecificAsmLexer->getTok());
+ }
+ }
+
+ ParserMutex.release();
+
+ return ret;
+}
+
+int EDDisassembler::llvmSyntaxVariant() const {
+ return LLVMSyntaxVariant;
+}