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This will break users of the LLVMCreateDisasm API (not that I know of any). They have to call the LLVMInitializeAll* functions from llvm-c/Target.h themselves now. edis' C API in all its horribleness should be unaffected. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144385 91177308-0d34-0410-b5e6-96231b3b80d8
168 lines
6.1 KiB
C++
168 lines
6.1 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/MCRegisterInfo.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 LLVMCreateDisasm(const char *TripleName, void *DisInfo,
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int TagType, 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(TripleName, Error);
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assert(TheTarget && "Unable to create target!");
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// Get the assembler info needed to setup the MCContext.
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const MCAsmInfo *MAI = TheTarget->createMCAsmInfo(TripleName);
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assert(MAI && "Unable to create target asm info!");
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const MCRegisterInfo *MRI = TheTarget->createMCRegInfo(TripleName);
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assert(MRI && "Unable to create target register info!");
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// Package up features to be passed to target/subtarget
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std::string FeaturesStr;
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std::string CPU;
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const MCSubtargetInfo *STI = TheTarget->createMCSubtargetInfo(TripleName, CPU,
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FeaturesStr);
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assert(STI && "Unable to create subtarget info!");
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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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assert(Ctx && "Unable to create MCContext!");
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// Set up disassembler.
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MCDisassembler *DisAsm = TheTarget->createMCDisassembler(*STI);
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assert(DisAsm && "Unable to create disassembler!");
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DisAsm->setupForSymbolicDisassembly(GetOpInfo, SymbolLookUp, DisInfo, Ctx);
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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, *STI);
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assert(IP && "Unable to create instruction printer!");
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LLVMDisasmContext *DC = new LLVMDisasmContext(TripleName, DisInfo, TagType,
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GetOpInfo, SymbolLookUp,
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TheTarget, MAI, MRI,
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Ctx, DisAsm, IP);
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assert(DC && "Allocation failure!");
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return DC;
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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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return 0;
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}
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