mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-30 17:33:24 +00:00
68a590df13
It was a nasty oversight that we didn't include this when we added this API in the first place. Blech. rdar://12839439 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169653 91177308-0d34-0410-b5e6-96231b3b80d8
200 lines
7.4 KiB
C++
200 lines
7.4 KiB
C++
//===-- lib/MC/Disassembler.cpp - Disassembler Public C Interface ---------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "Disassembler.h"
|
|
#include "llvm-c/Disassembler.h"
|
|
#include "llvm/MC/MCAsmInfo.h"
|
|
#include "llvm/MC/MCContext.h"
|
|
#include "llvm/MC/MCDisassembler.h"
|
|
#include "llvm/MC/MCInst.h"
|
|
#include "llvm/MC/MCInstPrinter.h"
|
|
#include "llvm/MC/MCInstrInfo.h"
|
|
#include "llvm/MC/MCRegisterInfo.h"
|
|
#include "llvm/MC/MCSubtargetInfo.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
#include "llvm/Support/MemoryObject.h"
|
|
#include "llvm/Support/TargetRegistry.h"
|
|
|
|
namespace llvm {
|
|
class Target;
|
|
} // namespace llvm
|
|
using namespace llvm;
|
|
|
|
// LLVMCreateDisasm() creates a disassembler for the TripleName. Symbolic
|
|
// disassembly is supported by passing a block of information in the DisInfo
|
|
// parameter and specifying the TagType and callback functions as described in
|
|
// the header llvm-c/Disassembler.h . The pointer to the block and the
|
|
// functions can all be passed as NULL. If successful, this returns a
|
|
// disassembler context. If not, it returns NULL.
|
|
//
|
|
LLVMDisasmContextRef LLVMCreateDisasmCPU(const char *Triple, const char *CPU,
|
|
void *DisInfo, int TagType,
|
|
LLVMOpInfoCallback GetOpInfo,
|
|
LLVMSymbolLookupCallback SymbolLookUp){
|
|
// Get the target.
|
|
std::string Error;
|
|
const Target *TheTarget = TargetRegistry::lookupTarget(Triple, Error);
|
|
assert(TheTarget && "Unable to create target!");
|
|
|
|
// Get the assembler info needed to setup the MCContext.
|
|
const MCAsmInfo *MAI = TheTarget->createMCAsmInfo(Triple);
|
|
assert(MAI && "Unable to create target asm info!");
|
|
|
|
const MCInstrInfo *MII = TheTarget->createMCInstrInfo();
|
|
assert(MII && "Unable to create target instruction info!");
|
|
|
|
const MCRegisterInfo *MRI = TheTarget->createMCRegInfo(Triple);
|
|
assert(MRI && "Unable to create target register info!");
|
|
|
|
// Package up features to be passed to target/subtarget
|
|
std::string FeaturesStr;
|
|
|
|
const MCSubtargetInfo *STI = TheTarget->createMCSubtargetInfo(Triple, CPU,
|
|
FeaturesStr);
|
|
assert(STI && "Unable to create subtarget info!");
|
|
|
|
// Set up the MCContext for creating symbols and MCExpr's.
|
|
MCContext *Ctx = new MCContext(*MAI, *MRI, 0);
|
|
assert(Ctx && "Unable to create MCContext!");
|
|
|
|
// Set up disassembler.
|
|
MCDisassembler *DisAsm = TheTarget->createMCDisassembler(*STI);
|
|
assert(DisAsm && "Unable to create disassembler!");
|
|
DisAsm->setupForSymbolicDisassembly(GetOpInfo, SymbolLookUp, DisInfo, Ctx);
|
|
|
|
// Set up the instruction printer.
|
|
int AsmPrinterVariant = MAI->getAssemblerDialect();
|
|
MCInstPrinter *IP = TheTarget->createMCInstPrinter(AsmPrinterVariant,
|
|
*MAI, *MII, *MRI, *STI);
|
|
assert(IP && "Unable to create instruction printer!");
|
|
|
|
LLVMDisasmContext *DC = new LLVMDisasmContext(Triple, DisInfo, TagType,
|
|
GetOpInfo, SymbolLookUp,
|
|
TheTarget, MAI, MRI,
|
|
STI, MII, Ctx, DisAsm, IP);
|
|
assert(DC && "Allocation failure!");
|
|
|
|
return DC;
|
|
}
|
|
|
|
LLVMDisasmContextRef LLVMCreateDisasm(const char *Triple, void *DisInfo,
|
|
int TagType, LLVMOpInfoCallback GetOpInfo,
|
|
LLVMSymbolLookupCallback SymbolLookUp) {
|
|
return LLVMCreateDisasmCPU(Triple, "", DisInfo, TagType, GetOpInfo,
|
|
SymbolLookUp);
|
|
}
|
|
|
|
//
|
|
// LLVMDisasmDispose() disposes of the disassembler specified by the context.
|
|
//
|
|
void LLVMDisasmDispose(LLVMDisasmContextRef DCR){
|
|
LLVMDisasmContext *DC = (LLVMDisasmContext *)DCR;
|
|
delete DC;
|
|
}
|
|
|
|
namespace {
|
|
//
|
|
// The memory object created by LLVMDisasmInstruction().
|
|
//
|
|
class DisasmMemoryObject : public MemoryObject {
|
|
uint8_t *Bytes;
|
|
uint64_t Size;
|
|
uint64_t BasePC;
|
|
public:
|
|
DisasmMemoryObject(uint8_t *bytes, uint64_t size, uint64_t basePC) :
|
|
Bytes(bytes), Size(size), BasePC(basePC) {}
|
|
|
|
uint64_t getBase() const { return BasePC; }
|
|
uint64_t getExtent() const { return Size; }
|
|
|
|
int readByte(uint64_t Addr, uint8_t *Byte) const {
|
|
if (Addr - BasePC >= Size)
|
|
return -1;
|
|
*Byte = Bytes[Addr - BasePC];
|
|
return 0;
|
|
}
|
|
};
|
|
} // end anonymous namespace
|
|
|
|
//
|
|
// LLVMDisasmInstruction() disassembles a single instruction using the
|
|
// disassembler context specified in the parameter DC. The bytes of the
|
|
// instruction are specified in the parameter Bytes, and contains at least
|
|
// BytesSize number of bytes. The instruction is at the address specified by
|
|
// the PC parameter. If a valid instruction can be disassembled its string is
|
|
// returned indirectly in OutString which whos size is specified in the
|
|
// parameter OutStringSize. This function returns the number of bytes in the
|
|
// instruction or zero if there was no valid instruction. If this function
|
|
// returns zero the caller will have to pick how many bytes they want to step
|
|
// over by printing a .byte, .long etc. to continue.
|
|
//
|
|
size_t LLVMDisasmInstruction(LLVMDisasmContextRef DCR, uint8_t *Bytes,
|
|
uint64_t BytesSize, uint64_t PC, char *OutString,
|
|
size_t OutStringSize){
|
|
LLVMDisasmContext *DC = (LLVMDisasmContext *)DCR;
|
|
// Wrap the pointer to the Bytes, BytesSize and PC in a MemoryObject.
|
|
DisasmMemoryObject MemoryObject(Bytes, BytesSize, PC);
|
|
|
|
uint64_t Size;
|
|
MCInst Inst;
|
|
const MCDisassembler *DisAsm = DC->getDisAsm();
|
|
MCInstPrinter *IP = DC->getIP();
|
|
MCDisassembler::DecodeStatus S;
|
|
S = DisAsm->getInstruction(Inst, Size, MemoryObject, PC,
|
|
/*REMOVE*/ nulls(), DC->CommentStream);
|
|
switch (S) {
|
|
case MCDisassembler::Fail:
|
|
case MCDisassembler::SoftFail:
|
|
// FIXME: Do something different for soft failure modes?
|
|
return 0;
|
|
|
|
case MCDisassembler::Success: {
|
|
DC->CommentStream.flush();
|
|
StringRef Comments = DC->CommentsToEmit.str();
|
|
|
|
SmallVector<char, 64> InsnStr;
|
|
raw_svector_ostream OS(InsnStr);
|
|
IP->printInst(&Inst, OS, Comments);
|
|
OS.flush();
|
|
|
|
// Tell the comment stream that the vector changed underneath it.
|
|
DC->CommentsToEmit.clear();
|
|
DC->CommentStream.resync();
|
|
|
|
assert(OutStringSize != 0 && "Output buffer cannot be zero size");
|
|
size_t OutputSize = std::min(OutStringSize-1, InsnStr.size());
|
|
std::memcpy(OutString, InsnStr.data(), OutputSize);
|
|
OutString[OutputSize] = '\0'; // Terminate string.
|
|
|
|
return Size;
|
|
}
|
|
}
|
|
llvm_unreachable("Invalid DecodeStatus!");
|
|
}
|
|
|
|
//
|
|
// LLVMSetDisasmOptions() sets the disassembler's options. It returns 1 if it
|
|
// can set all the Options and 0 otherwise.
|
|
//
|
|
int LLVMSetDisasmOptions(LLVMDisasmContextRef DCR, uint64_t Options){
|
|
if (Options & LLVMDisassembler_Option_UseMarkup){
|
|
LLVMDisasmContext *DC = (LLVMDisasmContext *)DCR;
|
|
MCInstPrinter *IP = DC->getIP();
|
|
IP->setUseMarkup(1);
|
|
Options &= ~LLVMDisassembler_Option_UseMarkup;
|
|
}
|
|
if (Options & LLVMDisassembler_Option_PrintImmHex){
|
|
LLVMDisasmContext *DC = (LLVMDisasmContext *)DCR;
|
|
MCInstPrinter *IP = DC->getIP();
|
|
IP->setPrintImmHex(1);
|
|
Options &= ~LLVMDisassembler_Option_PrintImmHex;
|
|
}
|
|
return (Options == 0);
|
|
}
|