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disasm.cpp
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disasm.cpp
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
/***********************************************************************
*
* File: disasm.cpp
*
* This file handles disassembly for the "late disassembler".
*
***********************************************************************/
#include "jitpch.h"
#ifdef _MSC_VER
#pragma hdrstop
#endif
/*****************************************************************************/
#ifdef LATE_DISASM
/*****************************************************************************/
#ifdef USE_COREDISTOOLS
// The loggers have no way to pass a context variable, so this is a global.
FILE* g_disAsmFileCorDisTools;
#endif // USE_COREDISTOOLS
// Define DISASM_DEBUG to get verbose output of late disassembler inner workings.
// #define DISASM_DEBUG
#ifdef DISASM_DEBUG
#ifdef DEBUG
#define DISASM_DUMP(...) \
if (VERBOSE) \
printf(__VA_ARGS__)
#else // !DEBUG
#define DISASM_DUMP(...) printf(__VA_ARGS__)
#endif // !DEBUG
#else // !DISASM_DEBUG
#define DISASM_DUMP(...)
#endif // !DISASM_DEBUG
/*****************************************************************************/
#ifdef USE_MSVCDIS
#define MAX_CLASSNAME_LENGTH 1024
#if defined(HOST_AMD64)
#pragma comment(linker, \
"/ALTERNATENAME:__imp_?CchFormatAddr@DIS@@QEBA_K_KPEAG0@Z=__imp_?CchFormatAddr@DIS@@QEBA_K_KPEA_W0@Z")
#pragma comment(linker, \
"/ALTERNATENAME:__imp_?CchFormatInstr@DIS@@QEBA_KPEAG_K@Z=__imp_?CchFormatInstr@DIS@@QEBA_KPEA_W_K@Z")
#pragma comment( \
linker, \
"/ALTERNATENAME:__imp_?PfncchaddrSet@DIS@@QEAAP6A_KPEBV1@_KPEAG1PEA_K@ZP6A_K01213@Z@Z=__imp_?PfncchaddrSet@DIS@@QEAAP6A_KPEBV1@_KPEA_W1PEA_K@ZP6A_K01213@Z@Z")
#pragma comment( \
linker, \
"/ALTERNATENAME:__imp_?PfncchregSet@DIS@@QEAAP6A_KPEBV1@W4REGA@1@PEAG_K@ZP6A_K0123@Z@Z=__imp_?PfncchregSet@DIS@@QEAAP6A_KPEBV1@W4REGA@1@PEA_W_K@ZP6A_K0123@Z@Z")
#pragma comment( \
linker, \
"/ALTERNATENAME:__imp_?PfncchregrelSet@DIS@@QEAAP6A_KPEBV1@W4REGA@1@KPEAG_KPEAK@ZP6A_K01K234@Z@Z=__imp_?PfncchregrelSet@DIS@@QEAAP6A_KPEBV1@W4REGA@1@KPEA_W_KPEAK@ZP6A_K01K234@Z@Z")
#pragma comment( \
linker, \
"/ALTERNATENAME:__imp_?PfncchfixupSet@DIS@@QEAAP6A_KPEBV1@_K1PEAG1PEA_K@ZP6A_K011213@Z@Z=__imp_?PfncchfixupSet@DIS@@QEAAP6A_KPEBV1@_K1PEA_W1PEA_K@ZP6A_K011213@Z@Z")
#elif defined(HOST_X86)
#pragma comment(linker, "/ALTERNATENAME:__imp_?CchFormatAddr@DIS@@QBEI_KPAGI@Z=__imp_?CchFormatAddr@DIS@@QBEI_KPA_WI@Z")
#pragma comment(linker, "/ALTERNATENAME:__imp_?CchFormatInstr@DIS@@QBEIPAGI@Z=__imp_?CchFormatInstr@DIS@@QBEIPA_WI@Z")
#pragma comment( \
linker, \
"/ALTERNATENAME:__imp_?PfncchaddrSet@DIS@@QAEP6GIPBV1@_KPAGIPA_K@ZP6GI012I3@Z@Z=__imp_?PfncchaddrSet@DIS@@QAEP6GIPBV1@_KPA_WIPA_K@ZP6GI012I3@Z@Z")
#pragma comment( \
linker, \
"/ALTERNATENAME:__imp_?PfncchregSet@DIS@@QAEP6GIPBV1@W4REGA@1@PAGI@ZP6GI012I@Z@Z=__imp_?PfncchregSet@DIS@@QAEP6GIPBV1@W4REGA@1@PA_WI@ZP6GI012I@Z@Z")
#pragma comment( \
linker, \
"/ALTERNATENAME:__imp_?PfncchregrelSet@DIS@@QAEP6GIPBV1@W4REGA@1@KPAGIPAK@ZP6GI01K2I3@Z@Z=__imp_?PfncchregrelSet@DIS@@QAEP6GIPBV1@W4REGA@1@KPA_WIPAK@ZP6GI01K2I3@Z@Z")
#pragma comment( \
linker, \
"/ALTERNATENAME:__imp_?PfncchfixupSet@DIS@@QAEP6GIPBV1@_KIPAGIPA_K@ZP6GI01I2I3@Z@Z=__imp_?PfncchfixupSet@DIS@@QAEP6GIPBV1@_KIPA_WIPA_K@ZP6GI01I2I3@Z@Z")
#endif // HOST_*
#endif // USE_MSVCDIS
/*****************************************************************************
* Given an absolute address from the beginning of the code
* find the corresponding emitter block and the relative offset
* of the current address in that block
* Was used to get to the fixup list of each block. The new emitter has
* no such fixups. Something needs to be added for this.
*/
// These structs were defined in emit.h. Fake them here so DisAsm.cpp can compile
typedef struct codeFix
{
codeFix* cfNext;
unsigned cfFixup;
}* codeFixPtr;
typedef struct codeBlk
{
codeFix* cbFixupLst;
}* codeBlkPtr;
#ifdef USE_MSVCDIS
/*****************************************************************************
* The following is the callback for jump label and direct function calls fixups.
* "addr" represents the address of jump that has to be
* replaced with a label or function name.
*
* Return 1 if a name was written representing the address, 0 otherwise.
*/
/* static */
size_t __stdcall DisAssembler::disCchAddr(
const DIS* pdis, DIS::ADDR addr, _In_reads_(cchMax) wchar_t* wz, size_t cchMax, DWORDLONG* pdwDisp)
{
DisAssembler* pDisAsm = (DisAssembler*)pdis->PvClient();
assert(pDisAsm);
return pDisAsm->disCchAddrMember(pdis, addr, wz, cchMax, pdwDisp);
}
size_t DisAssembler::disCchAddrMember(
const DIS* pdis, DIS::ADDR addr, _In_reads_(cchMax) wchar_t* wz, size_t cchMax, DWORDLONG* pdwDisp)
{
/* First check the termination type of the instruction
* because this might be a helper or static function call
* check to see if we have a fixup for the current address */
size_t retval = 0; // assume we don't know
#if defined(TARGET_XARCH)
DISX86::TRMTA terminationType = DISX86::TRMTA(pdis->Trmta());
DISASM_DUMP("AddrMember %p (%p), termType %u\n", addr, disGetLinearAddr((size_t)addr), terminationType);
switch (terminationType)
{
// int disCallSize;
case DISX86::trmtaJmpShort:
case DISX86::trmtaJmpCcShort:
/* We have a short jump in the current code block - generate the label to which we jump */
assert(0 <= disTarget && disTarget < disTotalCodeSize);
swprintf_s(wz, cchMax, W("short L_%02u"), disLabels[disTarget]);
retval = 1;
break;
case DISX86::trmtaJmpNear:
case DISX86::trmtaJmpCcNear:
/* We have a near jump. Check if is in the current code block.
* Otherwise we have no target for it. */
if (0 <= disTarget && disTarget < disTotalCodeSize)
{
swprintf_s(wz, cchMax, W("L_%02u"), disLabels[disTarget]);
retval = 1;
}
break;
case DISX86::trmtaCallNear16:
case DISX86::trmtaCallNear32:
/* check for local calls (i.e. CALL label) */
if (0 <= disTarget && disTarget < disTotalCodeSize)
{
/* not a "call ds:[0000]" - go ahead */
/* disTarget within block boundary -> local call */
swprintf_s(wz, cchMax, W("short L_%02u"), disLabels[disTarget]);
retval = 1;
break;
}
/* this is a near call - in our case usually VM helper functions */
/* find the emitter block and the offset of the call fixup */
/* for the fixup offset we have to add the opcode size for the call - in the case of a near call is 1 */
// disCallSize = 1;
{
size_t absoluteTarget = (size_t)disGetLinearAddr(disTarget);
const char* name = disGetMethodFullName(absoluteTarget);
if (name != nullptr)
{
swprintf_s(wz, cchMax, W("%zx %S"), dspAddr(absoluteTarget), name);
retval = 1;
break;
}
}
break;
#ifdef TARGET_AMD64
case DISX86::trmtaFallThrough:
/* memory indirect case. Could be for an LEA for the base address of a switch table, which is an arbitrary
* address, currently of the first block after the prolog. */
/* find the emitter block and the offset for the fixup
* "addr" is the address of the immediate */
break;
#endif // TARGET_AMD64
default:
printf("Termination type is %d\n", (int)terminationType);
assert(!"treat this case\n");
break;
}
#elif defined(TARGET_ARM64)
DISARM64::TRMTA terminationType = DISARM64::TRMTA(pdis->Trmta());
DISASM_DUMP("AddrMember %p (%p), termType %u\n", addr, disGetLinearAddr((size_t)addr), terminationType);
switch (terminationType)
{
// int disCallSize;
case DISARM64::TRMTA::trmtaBra:
case DISARM64::TRMTA::trmtaBraCase:
case DISARM64::TRMTA::trmtaBraCc:
case DISARM64::TRMTA::trmtaBraCcCase:
case DISARM64::TRMTA::trmtaBraCcInd:
case DISARM64::TRMTA::trmtaBraInd:
/* We have a jump. Check if is in the current code block.
* Otherwise we have no target for it. */
if (0 <= disTarget && disTarget < disTotalCodeSize)
{
swprintf_s(wz, cchMax, W("L_%02u"), disLabels[disTarget]);
retval = 1;
}
break;
case DISARM64::trmtaCall:
case DISARM64::trmtaCallCc:
case DISARM64::trmtaCallCcInd:
case DISARM64::trmtaCallInd:
/* check for local calls (i.e. CALL label) */
if (0 <= disTarget && disTarget < disTotalCodeSize)
{
/* not a "call [0000]" - go ahead */
/* disTarget within block boundary -> local call */
swprintf_s(wz, cchMax, W("L_%02u"), disLabels[disTarget]);
retval = 1;
break;
}
/* this is a near call - in our case usually VM helper functions */
/* find the emitter block and the offset of the call fixup */
/* for the fixup offset we have to add the opcode size for the call - in the case of a near call is 1 */
// disCallSize = 1;
{
size_t absoluteTarget = (size_t)disGetLinearAddr(disTarget);
const char* name = disGetMethodFullName(absoluteTarget);
if (name != nullptr)
{
swprintf_s(wz, cchMax, W("%zx %S"), dspAddr(absoluteTarget), name);
retval = 1;
break;
}
}
break;
case DISARM64::trmtaFallThrough:
/* memory indirect case. Could be for an LEA for the base address of a switch table, which is an arbitrary
* address, currently of the first block after the prolog. */
/* find the emitter block and the offset for the fixup
* "addr" is the address of the immediate */
{
DIS::INSTRUCTION instr;
DIS::OPERAND ops[DISARM64::coperandMax];
bool ok = pdis->FDecode(&instr, ops, ArrLen(ops));
if (ok)
{
bool isAddress = false;
switch ((DISARM64::OPA)instr.opa)
{
case DISARM64::opaAdr:
case DISARM64::opaAdrp:
isAddress = true;
break;
default:
break;
}
if (isAddress && 0 <= addr && addr < disTotalCodeSize)
{
swprintf_s(wz, cchMax, W("L_%02u"), disLabels[addr]);
retval = 1;
}
}
}
break;
default:
printf("Termination type is %d\n", (int)terminationType);
assert(!"treat this case\n");
break;
}
#else // TARGET*
#error Unsupported or unset target architecture
#endif // TARGET*
if (retval == 0)
{
if (disDiffable)
{
swprintf_s(wz, cchMax, W("%p"), dspAddr((void*)1));
}
}
else
{
/* no displacement */
*pdwDisp = 0x0;
}
return retval;
}
/*****************************************************************************
* We annotate some instructions to get info needed to display the symbols
* for that instruction.
*
* Return 1 if a name was written representing the address, 0 otherwise.
*/
/* static */
size_t __stdcall DisAssembler::disCchFixup(
const DIS* pdis, DIS::ADDR addr, size_t size, _In_reads_(cchMax) wchar_t* wz, size_t cchMax, DWORDLONG* pdwDisp)
{
DisAssembler* pDisAsm = (DisAssembler*)pdis->PvClient();
assert(pDisAsm);
return pDisAsm->disCchFixupMember(pdis, addr, size, wz, cchMax, pdwDisp);
}
size_t DisAssembler::disCchFixupMember(
const DIS* pdis, DIS::ADDR addr, size_t size, _In_reads_(cchMax) wchar_t* wz, size_t cchMax, DWORDLONG* pdwDisp)
{
#if defined(TARGET_XARCH)
DISX86::TRMTA terminationType = DISX86::TRMTA(pdis->Trmta());
// DIS::ADDR disIndAddr;
DISASM_DUMP("FixupMember %016I64X (%08IX), size %d, termType %u\n", addr, disGetLinearAddr((size_t)addr), size,
terminationType);
// Is there a relocation registered for the address?
size_t absoluteAddr = (size_t)disGetLinearAddr((size_t)addr);
size_t targetAddr;
bool anyReloc = GetRelocationMap()->Lookup(absoluteAddr, &targetAddr);
switch (terminationType)
{
DIS::ADDR disCallSize;
case DISX86::trmtaFallThrough:
/* memory indirect case */
assert(addr > pdis->Addr());
/* find the emitter block and the offset for the fixup
* "addr" is the address of the immediate */
if (anyReloc)
{
// Make instructions like "mov rcx, 7FE8247A638h" diffable.
swprintf_s(wz, cchMax, W("%zXh"), dspAddr(targetAddr));
break;
}
return 0;
case DISX86::trmtaJmpInd:
/* pretty rare case - something like "jmp [eax*4]"
* not a function call or anything worth annotating */
return 0;
case DISX86::trmtaTrap:
case DISX86::trmtaTrapCc:
/* some instructions like division have a TRAP termination type - ignore it */
return 0;
case DISX86::trmtaJmpShort:
case DISX86::trmtaJmpCcShort:
case DISX86::trmtaJmpNear:
case DISX86::trmtaJmpCcNear:
/* these are treated by the CchAddr callback - skip them */
return 0;
case DISX86::trmtaCallNear16:
case DISX86::trmtaCallNear32:
if (anyReloc)
{
const char* name = disGetMethodFullName(targetAddr);
if (name != nullptr)
{
swprintf_s(wz, cchMax, W("%zx %S"), dspAddr(targetAddr), name);
break;
}
}
/* these are treated by the CchAddr callback - skip them */
return 0;
case DISX86::trmtaCallInd:
/* here we have an indirect call - find the indirect address */
// BYTE * code = disGetLinearAddr((size_t)addr);
// disIndAddr = (DIS::ADDR) (code+0);
/* find the size of the call opcode - less the immediate */
/* for the fixup offset we have to add the opcode size for the call */
/* addr is the address of the immediate, pdis->Addr() returns the address of the disassembled instruction */
assert(addr > pdis->Addr());
disCallSize = addr - pdis->Addr();
/* find the emitter block and the offset of the call fixup */
return 0;
default:
printf("Termination type is %d\n", (int)terminationType);
assert(!"treat this case\n");
break;
}
#elif defined(TARGET_ARM64)
DISARM64::TRMTA terminationType = DISARM64::TRMTA(pdis->Trmta());
// DIS::ADDR disIndAddr;
DISASM_DUMP("FixupMember %016I64X (%08IX), size %d, termType %u\n", addr, disGetLinearAddr((size_t)addr), size,
terminationType);
// Is there a relocation registered for the address?
size_t absoluteAddr = (size_t)disGetLinearAddr((size_t)addr);
size_t targetAddr;
bool anyReloc = GetRelocationMap()->Lookup(absoluteAddr, &targetAddr);
switch (terminationType)
{
DIS::ADDR disCallSize;
case DISARM64::TRMTA::trmtaUnknown:
return 0;
case DISARM64::TRMTA::trmtaFallThrough:
if (anyReloc)
{
/* memory indirect case */
assert(addr > pdis->Addr());
/* find the emitter block and the offset for the fixup
* "addr" is the address of the immediate */
// Make instructions like "mov rcx, 7FE8247A638h" diffable.
swprintf_s(wz, cchMax, W("%zXh"), dspAddr(targetAddr));
break;
}
return 0;
case DISARM64::TRMTA::trmtaBraInd:
case DISARM64::TRMTA::trmtaBraCcInd:
/* pretty rare case - something like "jmp [eax*4]"
* not a function call or anything worth annotating */
return 0;
case DISARM64::TRMTA::trmtaTrap:
case DISARM64::TRMTA::trmtaTrapCc:
/* some instructions like division have a TRAP termination type - ignore it */
return 0;
case DISARM64::TRMTA::trmtaBra:
case DISARM64::TRMTA::trmtaBraCase:
case DISARM64::TRMTA::trmtaBraCc:
case DISARM64::TRMTA::trmtaBraCcCase:
/* these are treated by the CchAddr callback - skip them */
return 0;
case DISARM64::TRMTA::trmtaCall:
case DISARM64::TRMTA::trmtaCallCc:
if (anyReloc)
{
const char* name = disGetMethodFullName(targetAddr);
if (name != nullptr)
{
swprintf_s(wz, cchMax, W("%zx %S"), dspAddr(targetAddr), name);
break;
}
}
/* these are treated by the CchAddr callback - skip them */
return 0;
case DISARM64::TRMTA::trmtaCallInd:
case DISARM64::TRMTA::trmtaCallCcInd:
/* here we have an indirect call - find the indirect address */
// BYTE * code = disGetLinearAddr((size_t)addr);
// disIndAddr = (DIS::ADDR) (code+0);
/* find the size of the call opcode - less the immediate */
/* for the fixup offset we have to add the opcode size for the call */
/* addr is the address of the immediate, pdis->Addr() returns the address of the disassembled instruction */
assert(addr > pdis->Addr());
disCallSize = addr - pdis->Addr();
/* find the emitter block and the offset of the call fixup */
return 0;
default:
printf("Termination type is %d\n", (int)terminationType);
assert(!"treat this case\n");
break;
}
#else // TARGET*
#error Unsupported or unset target architecture
#endif // TARGET*
/* no displacement */
*pdwDisp = 0x0;
return 1;
}
/*****************************************************************************
* This the callback for register-relative operands in an instruction.
* If the register is ESP or EBP, the operand may be a local variable
* or a parameter, else the operand may be an instance variable
*
* Return 1 if a name was written representing the register-relative operand, 0 otherwise.
*/
/* static */
size_t __stdcall DisAssembler::disCchRegRel(
const DIS* pdis, DIS::REGA reg, DWORD disp, _In_reads_(cchMax) wchar_t* wz, size_t cchMax, DWORD* pdwDisp)
{
DisAssembler* pDisAsm = (DisAssembler*)pdis->PvClient();
assert(pDisAsm);
return pDisAsm->disCchRegRelMember(pdis, reg, disp, wz, cchMax, pdwDisp);
}
size_t DisAssembler::disCchRegRelMember(
const DIS* pdis, DIS::REGA reg, DWORD disp, _In_reads_(cchMax) wchar_t* wz, size_t cchMax, DWORD* pdwDisp)
{
#if defined(TARGET_XARCH)
DISX86::TRMTA terminationType = DISX86::TRMTA(pdis->Trmta());
// DIS::ADDR disIndAddr;
DISASM_DUMP("RegRelMember reg %u, disp %u, termType %u\n", reg, disp, terminationType);
switch (terminationType)
{
int disOpcodeSize;
const char* var;
case DISX86::trmtaFallThrough:
/* some instructions like division have a TRAP termination type - ignore it */
case DISX86::trmtaTrap:
case DISX86::trmtaTrapCc:
var = disComp->codeGen->siStackVarName((size_t)(pdis->Addr() - disStartAddr), pdis->Cb(), reg, disp);
if (var)
{
swprintf_s(wz, cchMax, W("%hs+%Xh '%hs'"), getRegName(reg), disp, var);
*pdwDisp = 0;
return 1;
}
/* This case consists of non-static members */
/* find the emitter block and the offset for the fixup
* fixup is emitted after the coding of the instruction - size = word (2 bytes)
* GRRRR!!! - for the 16 bit case we have to check for the address size prefix = 0x66
*/
if (*disGetLinearAddr(disCurOffset) == 0x66)
{
disOpcodeSize = 3;
}
else
{
disOpcodeSize = 2;
}
return 0;
case DISX86::trmtaCallNear16:
case DISX86::trmtaCallNear32:
case DISX86::trmtaJmpInd:
break;
case DISX86::trmtaCallInd:
/* check if this is a one byte displacement */
if ((signed char)disp == (int)disp)
{
/* we have a one byte displacement -> there were no previous callbacks */
/* find the size of the call opcode - less the immediate */
/* this is a call R/M indirect -> opcode size is 2 */
disOpcodeSize = 2;
/* find the emitter block and the offset of the call fixup */
return 0;
}
else
{
/* check if we already have a symbol name as replacement */
if (disHasName)
{
/* CchFixup has been called before - we have a symbol name saved in global var disFuncTempBuf */
swprintf_s(wz, cchMax, W("%hs+%u '%hs'"), getRegName(reg), disp, disFuncTempBuf);
*pdwDisp = 0;
disHasName = false;
return 1;
}
else
{
return 0;
}
}
default:
printf("Termination type is %d\n", (int)terminationType);
assert(!"treat this case\n");
break;
}
#elif defined(TARGET_ARM64)
DISARM64::TRMTA terminationType = DISARM64::TRMTA(pdis->Trmta());
DISASM_DUMP("RegRelMember reg %u, disp %u, termType %u\n", reg, disp, terminationType);
switch (terminationType)
{
int disOpcodeSize;
const char* var;
case DISARM64::TRMTA::trmtaFallThrough:
/* some instructions like division have a TRAP termination type - ignore it */
case DISARM64::TRMTA::trmtaTrap:
case DISARM64::TRMTA::trmtaTrapCc:
var = disComp->codeGen->siStackVarName((size_t)(pdis->Addr() - disStartAddr), pdis->Cb(), reg, disp);
if (var)
{
swprintf_s(wz, cchMax, W("%hs+%Xh '%hs'"), getRegName(reg), disp, var);
*pdwDisp = 0;
return 1;
}
/* This case consists of non-static members */
// TODO-ARM64-Bug?: Is this correct?
disOpcodeSize = 2;
return 0;
case DISARM64::TRMTA::trmtaCall:
case DISARM64::TRMTA::trmtaCallCc:
case DISARM64::TRMTA::trmtaBraInd:
case DISARM64::TRMTA::trmtaBraCcInd:
break;
case DISARM64::TRMTA::trmtaCallInd:
case DISARM64::TRMTA::trmtaCallCcInd:
/* check if this is a one byte displacement */
if ((signed char)disp == (int)disp)
{
/* we have a one byte displacement -> there were no previous callbacks */
/* find the size of the call opcode - less the immediate */
/* this is a call R/M indirect -> opcode size is 2 */
// TODO-ARM64-Bug?: Is this correct?
disOpcodeSize = 2;
/* find the emitter block and the offset of the call fixup */
return 0;
}
else
{
/* check if we already have a symbol name as replacement */
if (disHasName)
{
/* CchFixup has been called before - we have a symbol name saved in global var disFuncTempBuf */
swprintf_s(wz, cchMax, W("%hs+%u '%hs'"), getRegName(reg), disp, disFuncTempBuf);
*pdwDisp = 0;
disHasName = false;
return 1;
}
else
{
return 0;
}
}
default:
printf("Termination type is %d\n", (int)terminationType);
assert(!"treat this case\n");
break;
}
#else // TARGET*
#error Unsupported or unset target architecture
#endif // TARGET*
/* save displacement */
*pdwDisp = disp;
return 1;
}
/*****************************************************************************
*
* Callback for register operands. Most probably, this is a local variable or
* a parameter
*
* Return 1 if a name was written representing the register, 0 otherwise.
*/
/* static */
size_t __stdcall DisAssembler::disCchReg(const DIS* pdis, DIS::REGA reg, _In_reads_(cchMax) wchar_t* wz, size_t cchMax)
{
DisAssembler* pDisAsm = (DisAssembler*)pdis->PvClient();
assert(pDisAsm);
return pDisAsm->disCchRegMember(pdis, reg, wz, cchMax);
}
size_t DisAssembler::disCchRegMember(const DIS* pdis, DIS::REGA reg, _In_reads_(cchMax) wchar_t* wz, size_t cchMax)
{
// TODO-Review: DIS::REGA does not directly map to our regNumber! E.g., look at DISARM64::REGA --
// the Wt registers come first (and do map to our regNumber), but the Xt registers follow.
// Until this is fixed, don't use this function!
disHasName = false;
return 0;
#if 0
const char * var = disComp->codeGen->siRegVarName(
(size_t)(pdis->Addr() - disStartAddr),
pdis->Cb(),
reg);
if (var)
{
if (disHasName)
{
/* CchRegRel has been called before - we have a symbol name saved in global var disFuncTempBuf */
swprintf_s(wz, cchMax, W("%hs'%hs.%hs'"), getRegName(reg), var, disFuncTempBuf);
disHasName = false;
return 1;
}
else
{
swprintf_s(wz, cchMax, W("%hs'%hs'"), getRegName(reg), var);
return 1;
}
}
else
{
if (disHasName)
{
/* this is the ugly case when a variable is incorrectly presumed dead */
swprintf_s(wz, cchMax, W("%hs'%hs.%hs'"), getRegName(reg), "<InstVar>", disFuncTempBuf);
disHasName = false;
return 1;
}
/* just to make sure we didn't bungle if var returns NULL */
disHasName = false;
return 0;
}
#endif // 0
}
#endif // USE_MSVCDIS
/*****************************************************************************
* Helper function to lazily create a map from code address to CORINFO_METHOD_HANDLE.
*/
AddrToMethodHandleMap* DisAssembler::GetAddrToMethodHandleMap()
{
if (disAddrToMethodHandleMap == nullptr)
{
disAddrToMethodHandleMap = new (disComp->getAllocator()) AddrToMethodHandleMap(disComp->getAllocator());
}
return disAddrToMethodHandleMap;
}
/*****************************************************************************
* Helper function to lazily create a map from code address to CORINFO_METHOD_HANDLE.
*/
AddrToMethodHandleMap* DisAssembler::GetHelperAddrToMethodHandleMap()
{
if (disHelperAddrToMethodHandleMap == nullptr)
{
disHelperAddrToMethodHandleMap = new (disComp->getAllocator()) AddrToMethodHandleMap(disComp->getAllocator());
}
return disHelperAddrToMethodHandleMap;
}
/*****************************************************************************
* Helper function to lazily create a map from relocation address to relocation target address.
*/
AddrToAddrMap* DisAssembler::GetRelocationMap()
{
if (disRelocationMap == nullptr)
{
disRelocationMap = new (disComp->getAllocator()) AddrToAddrMap(disComp->getAllocator());
}
return disRelocationMap;
}
#ifdef USE_MSVCDIS
/*****************************************************************************
* Return the count of bytes disassembled.
*/
size_t DisAssembler::CbDisassemble(DIS* pdis,
size_t offs,
DIS::ADDR addr,
const BYTE* pb,
size_t cbMax,
FILE* pfile,
bool findLabels,
bool printit /* = false */,
bool dispOffs /* = false */,
bool dispCodeBytes /* = false */)
{
assert(pdis);
size_t cb = pdis->CbDisassemble(addr, pb, cbMax);
if (cb == 0)
{
DISASM_DUMP("CbDisassemble offs %zu addr %llu\n", offs, addr);
// assert(!"can't disassemble instruction!!!");
fprintf(pfile, "MSVCDIS can't disassemble instruction @ offset %zu (0x%02zx)!!!\n", offs, offs);
#if defined(TARGET_ARM64)
fprintf(pfile, "%08Xh\n", *(unsigned int*)pb);
return 4;
#else
fprintf(pfile, "%02Xh\n", *pb);
return 1;
#endif
}
#if defined(TARGET_ARM64)
assert(cb == 4); // all instructions are 4 bytes!
#endif // TARGET_ARM64
/* remember current offset and instruction size */
disCurOffset = (size_t)addr;
disInstSize = cb;
/* Set the disTarget address */
disTarget = (size_t)pdis->AddrTarget();
if (findLabels)
{
#if defined(TARGET_XARCH)
DISX86::TRMTA terminationType = DISX86::TRMTA(pdis->Trmta());
/* check the termination type of the instruction */
switch (terminationType)
{
case DISX86::trmtaCallNear16:
case DISX86::trmtaCallNear32:
case DISX86::trmtaCallFar:
{
// Don't count addresses in the relocation table
size_t targetAddr;
size_t absoluteAddr =
(size_t)disGetLinearAddr((size_t)pdis->AddrAddress(1)); // Get the address in the instruction of the
// call target address (the address the
// reloc is applied to).
if (GetRelocationMap()->Lookup(absoluteAddr, &targetAddr))
{
break;
}
}
FALLTHROUGH;
case DISX86::trmtaJmpShort:
case DISX86::trmtaJmpNear:
case DISX86::trmtaJmpFar:
case DISX86::trmtaJmpCcShort:
case DISX86::trmtaJmpCcNear:
/* a CALL is local iff the disTarget is within the block boundary */
/* mark the jump label in the disTarget vector and return */
if (disTarget != DIS::addrNil) // There seems to be an assumption that you can't branch to the first
// address of the function (prolog).
{
if (0 <= disTarget && disTarget < disTotalCodeSize)
{
/* we're OK, disTarget within block boundary */
disLabels[disTarget] = 1;
}
}
break;