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Someone may want to do something crazy, like replace these objects if they change or something. No functionality change intended. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184175 91177308-0d34-0410-b5e6-96231b3b80d8
237 lines
8.4 KiB
C++
237 lines
8.4 KiB
C++
//===-- lib/MC/Disassembler.cpp - Disassembler Public C Interface ---------===//
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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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#include "Disassembler.h"
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#include "llvm-c/Disassembler.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCDisassembler.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCInstPrinter.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCRelocationInfo.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/MC/MCSymbolizer.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MemoryObject.h"
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#include "llvm/Support/TargetRegistry.h"
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namespace llvm {
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class Target;
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} // namespace llvm
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using namespace llvm;
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// LLVMCreateDisasm() creates a disassembler for the TripleName. Symbolic
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// disassembly is supported by passing a block of information in the DisInfo
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// parameter and specifying the TagType and callback functions as described in
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// the header llvm-c/Disassembler.h . The pointer to the block and the
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// functions can all be passed as NULL. If successful, this returns a
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// disassembler context. If not, it returns NULL.
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//
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LLVMDisasmContextRef LLVMCreateDisasmCPU(const char *Triple, const char *CPU,
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void *DisInfo, int TagType,
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LLVMOpInfoCallback GetOpInfo,
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LLVMSymbolLookupCallback SymbolLookUp){
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// Get the target.
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std::string Error;
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const Target *TheTarget = TargetRegistry::lookupTarget(Triple, Error);
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if (!TheTarget)
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return 0;
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const MCRegisterInfo *MRI = TheTarget->createMCRegInfo(Triple);
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if (!MRI)
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return 0;
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// Get the assembler info needed to setup the MCContext.
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const MCAsmInfo *MAI = TheTarget->createMCAsmInfo(*MRI, Triple);
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if (!MAI)
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return 0;
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const MCInstrInfo *MII = TheTarget->createMCInstrInfo();
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if (!MII)
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return 0;
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// Package up features to be passed to target/subtarget
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std::string FeaturesStr;
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const MCSubtargetInfo *STI = TheTarget->createMCSubtargetInfo(Triple, CPU,
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FeaturesStr);
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if (!STI)
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return 0;
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// Set up the MCContext for creating symbols and MCExpr's.
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MCContext *Ctx = new MCContext(MAI, MRI, 0);
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if (!Ctx)
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return 0;
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// Set up disassembler.
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MCDisassembler *DisAsm = TheTarget->createMCDisassembler(*STI);
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if (!DisAsm)
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return 0;
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OwningPtr<MCRelocationInfo> RelInfo(
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TheTarget->createMCRelocationInfo(Triple, *Ctx));
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if (!RelInfo)
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return 0;
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OwningPtr<MCSymbolizer> Symbolizer(
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TheTarget->createMCSymbolizer(Triple, GetOpInfo, SymbolLookUp, DisInfo,
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Ctx, RelInfo.take()));
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DisAsm->setSymbolizer(Symbolizer);
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DisAsm->setupForSymbolicDisassembly(GetOpInfo, SymbolLookUp, DisInfo,
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Ctx, RelInfo);
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// Set up the instruction printer.
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int AsmPrinterVariant = MAI->getAssemblerDialect();
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MCInstPrinter *IP = TheTarget->createMCInstPrinter(AsmPrinterVariant,
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*MAI, *MII, *MRI, *STI);
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if (!IP)
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return 0;
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LLVMDisasmContext *DC = new LLVMDisasmContext(Triple, DisInfo, TagType,
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GetOpInfo, SymbolLookUp,
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TheTarget, MAI, MRI,
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STI, MII, Ctx, DisAsm, IP);
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if (!DC)
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return 0;
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return DC;
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}
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LLVMDisasmContextRef LLVMCreateDisasm(const char *Triple, void *DisInfo,
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int TagType, LLVMOpInfoCallback GetOpInfo,
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LLVMSymbolLookupCallback SymbolLookUp) {
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return LLVMCreateDisasmCPU(Triple, "", DisInfo, TagType, GetOpInfo,
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SymbolLookUp);
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}
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//
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// LLVMDisasmDispose() disposes of the disassembler specified by the context.
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//
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void LLVMDisasmDispose(LLVMDisasmContextRef DCR){
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LLVMDisasmContext *DC = (LLVMDisasmContext *)DCR;
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delete DC;
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}
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namespace {
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//
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// The memory object created by LLVMDisasmInstruction().
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//
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class DisasmMemoryObject : public MemoryObject {
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uint8_t *Bytes;
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uint64_t Size;
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uint64_t BasePC;
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public:
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DisasmMemoryObject(uint8_t *bytes, uint64_t size, uint64_t basePC) :
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Bytes(bytes), Size(size), BasePC(basePC) {}
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uint64_t getBase() const { return BasePC; }
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uint64_t getExtent() const { return Size; }
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int readByte(uint64_t Addr, uint8_t *Byte) const {
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if (Addr - BasePC >= Size)
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return -1;
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*Byte = Bytes[Addr - BasePC];
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return 0;
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}
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};
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} // end anonymous namespace
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//
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// LLVMDisasmInstruction() disassembles a single instruction using the
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// disassembler context specified in the parameter DC. The bytes of the
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// instruction are specified in the parameter Bytes, and contains at least
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// BytesSize number of bytes. The instruction is at the address specified by
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// the PC parameter. If a valid instruction can be disassembled its string is
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// returned indirectly in OutString which whos size is specified in the
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// parameter OutStringSize. This function returns the number of bytes in the
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// instruction or zero if there was no valid instruction. If this function
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// returns zero the caller will have to pick how many bytes they want to step
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// over by printing a .byte, .long etc. to continue.
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//
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size_t LLVMDisasmInstruction(LLVMDisasmContextRef DCR, uint8_t *Bytes,
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uint64_t BytesSize, uint64_t PC, char *OutString,
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size_t OutStringSize){
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LLVMDisasmContext *DC = (LLVMDisasmContext *)DCR;
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// Wrap the pointer to the Bytes, BytesSize and PC in a MemoryObject.
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DisasmMemoryObject MemoryObject(Bytes, BytesSize, PC);
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uint64_t Size;
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MCInst Inst;
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const MCDisassembler *DisAsm = DC->getDisAsm();
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MCInstPrinter *IP = DC->getIP();
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MCDisassembler::DecodeStatus S;
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S = DisAsm->getInstruction(Inst, Size, MemoryObject, PC,
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/*REMOVE*/ nulls(), DC->CommentStream);
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switch (S) {
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case MCDisassembler::Fail:
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case MCDisassembler::SoftFail:
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// FIXME: Do something different for soft failure modes?
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return 0;
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case MCDisassembler::Success: {
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DC->CommentStream.flush();
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StringRef Comments = DC->CommentsToEmit.str();
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SmallVector<char, 64> InsnStr;
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raw_svector_ostream OS(InsnStr);
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IP->printInst(&Inst, OS, Comments);
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OS.flush();
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// Tell the comment stream that the vector changed underneath it.
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DC->CommentsToEmit.clear();
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DC->CommentStream.resync();
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assert(OutStringSize != 0 && "Output buffer cannot be zero size");
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size_t OutputSize = std::min(OutStringSize-1, InsnStr.size());
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std::memcpy(OutString, InsnStr.data(), OutputSize);
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OutString[OutputSize] = '\0'; // Terminate string.
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return Size;
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}
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}
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llvm_unreachable("Invalid DecodeStatus!");
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}
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//
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// LLVMSetDisasmOptions() sets the disassembler's options. It returns 1 if it
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// can set all the Options and 0 otherwise.
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//
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int LLVMSetDisasmOptions(LLVMDisasmContextRef DCR, uint64_t Options){
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if (Options & LLVMDisassembler_Option_UseMarkup){
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LLVMDisasmContext *DC = (LLVMDisasmContext *)DCR;
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MCInstPrinter *IP = DC->getIP();
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IP->setUseMarkup(1);
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Options &= ~LLVMDisassembler_Option_UseMarkup;
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}
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if (Options & LLVMDisassembler_Option_PrintImmHex){
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LLVMDisasmContext *DC = (LLVMDisasmContext *)DCR;
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MCInstPrinter *IP = DC->getIP();
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IP->setPrintImmHex(1);
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Options &= ~LLVMDisassembler_Option_PrintImmHex;
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}
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if (Options & LLVMDisassembler_Option_AsmPrinterVariant){
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LLVMDisasmContext *DC = (LLVMDisasmContext *)DCR;
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// Try to set up the new instruction printer.
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const MCAsmInfo *MAI = DC->getAsmInfo();
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const MCInstrInfo *MII = DC->getInstrInfo();
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const MCRegisterInfo *MRI = DC->getRegisterInfo();
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const MCSubtargetInfo *STI = DC->getSubtargetInfo();
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int AsmPrinterVariant = MAI->getAssemblerDialect();
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AsmPrinterVariant = AsmPrinterVariant == 0 ? 1 : 0;
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MCInstPrinter *IP = DC->getTarget()->createMCInstPrinter(
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AsmPrinterVariant, *MAI, *MII, *MRI, *STI);
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if (IP) {
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DC->setIP(IP);
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Options &= ~LLVMDisassembler_Option_AsmPrinterVariant;
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}
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}
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return (Options == 0);
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}
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