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llvm/tools/llvm-readobj/ARMWinEHPrinter.cpp
Rafael Espindola 50bea40e8e Simplify getSymbolType. 
This is still a really odd function. Most calls are in object format specific
contexts and should probably be replaced with a more direct query, but at least
now this is not too obnoxious to use.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240777 91177308-0d34-0410-b5e6-96231b3b80d8
2015-06-26 12:18:49 +00:00

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//===-- ARMWinEHPrinter.cpp - Windows on ARM EH Data Printer ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// Windows on ARM uses a series of serialised data structures (RuntimeFunction)
// to create a table of information for unwinding. In order to conserve space,
// there are two different ways that this data is represented.
//
// For functions with canonical forms for the prologue and epilogue, the data
// can be stored in a "packed" form. In this case, the data is packed into the
// RuntimeFunction's remaining 30-bits and can fully describe the entire frame.
//
// +---------------------------------------+
// | Function Entry Address |
// +---------------------------------------+
// | Packed Form Data |
// +---------------------------------------+
//
// This layout is parsed by Decoder::dumpPackedEntry. No unwind bytecode is
// associated with such a frame as they can be derived from the provided data.
// The decoder does not synthesize this data as it is unnecessary for the
// purposes of validation, with the synthesis being required only by a proper
// unwinder.
//
// For functions that are large or do not match canonical forms, the data is
// split up into two portions, with the actual data residing in the "exception
// data" table (.xdata) with a reference to the entry from the "procedure data"
// (.pdata) entry.
//
// The exception data contains information about the frame setup, all of the
// epilouge scopes (for functions for which there are multiple exit points) and
// the associated exception handler. Additionally, the entry contains byte-code
// describing how to unwind the function (c.f. Decoder::decodeOpcodes).
//
// +---------------------------------------+
// | Function Entry Address |
// +---------------------------------------+
// | Exception Data Entry Address |
// +---------------------------------------+
//
// This layout is parsed by Decoder::dumpUnpackedEntry. Such an entry must
// first resolve the exception data entry address. This structure
// (ExceptionDataRecord) has a variable sized header
// (c.f. ARM::WinEH::HeaderWords) and encodes most of the same information as
// the packed form. However, because this information is insufficient to
// synthesize the unwinding, there are associated unwinding bytecode which make
// up the bulk of the Decoder.
//
// The decoder itself is table-driven, using the first byte to determine the
// opcode and dispatching to the associated printing routine. The bytecode
// itself is a variable length instruction encoding that can fully describe the
// state of the stack and the necessary operations for unwinding to the
// beginning of the frame.
//
// The byte-code maintains a 1-1 instruction mapping, indicating both the width
// of the instruction (Thumb2 instructions are variable length, 16 or 32 bits
// wide) allowing the program to unwind from any point in the prologue, body, or
// epilogue of the function.
#include "ARMWinEHPrinter.h"
#include "Error.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/ARMWinEH.h"
#include "llvm/Support/Format.h"
using namespace llvm;
using namespace llvm::object;
using namespace llvm::support;
namespace llvm {
raw_ostream &operator<<(raw_ostream &OS, const ARM::WinEH::ReturnType &RT) {
switch (RT) {
case ARM::WinEH::ReturnType::RT_POP:
OS << "pop {pc}";
break;
case ARM::WinEH::ReturnType::RT_B:
OS << "b target";
break;
case ARM::WinEH::ReturnType::RT_BW:
OS << "b.w target";
break;
case ARM::WinEH::ReturnType::RT_NoEpilogue:
OS << "(no epilogue)";
break;
}
return OS;
}
}
static std::string formatSymbol(StringRef Name, uint64_t Address,
uint64_t Offset = 0) {
std::string Buffer;
raw_string_ostream OS(Buffer);
if (!Name.empty())
OS << Name << " ";
if (Offset)
OS << format("+0x%X (0x%" PRIX64 ")", Offset, Address);
else if (!Name.empty())
OS << format("(0x%" PRIX64 ")", Address);
else
OS << format("0x%" PRIX64, Address);
return OS.str();
}
namespace llvm {
namespace ARM {
namespace WinEH {
const size_t Decoder::PDataEntrySize = sizeof(RuntimeFunction);
// TODO name the uops more appropriately
const Decoder::RingEntry Decoder::Ring[] = {
{ 0x80, 0x00, &Decoder::opcode_0xxxxxxx }, // UOP_STACK_FREE (16-bit)
{ 0xc0, 0x80, &Decoder::opcode_10Lxxxxx }, // UOP_POP (32-bit)
{ 0xf0, 0xc0, &Decoder::opcode_1100xxxx }, // UOP_STACK_SAVE (16-bit)
{ 0xf8, 0xd0, &Decoder::opcode_11010Lxx }, // UOP_POP (16-bit)
{ 0xf8, 0xd8, &Decoder::opcode_11011Lxx }, // UOP_POP (32-bit)
{ 0xf8, 0xe0, &Decoder::opcode_11100xxx }, // UOP_VPOP (32-bit)
{ 0xfc, 0xe8, &Decoder::opcode_111010xx }, // UOP_STACK_FREE (32-bit)
{ 0xfe, 0xec, &Decoder::opcode_1110110L }, // UOP_POP (16-bit)
{ 0xff, 0xee, &Decoder::opcode_11101110 }, // UOP_MICROSOFT_SPECIFIC (16-bit)
// UOP_PUSH_MACHINE_FRAME
// UOP_PUSH_CONTEXT
// UOP_PUSH_TRAP_FRAME
// UOP_REDZONE_RESTORE_LR
{ 0xff, 0xef, &Decoder::opcode_11101111 }, // UOP_LDRPC_POSTINC (32-bit)
{ 0xff, 0xf5, &Decoder::opcode_11110101 }, // UOP_VPOP (32-bit)
{ 0xff, 0xf6, &Decoder::opcode_11110110 }, // UOP_VPOP (32-bit)
{ 0xff, 0xf7, &Decoder::opcode_11110111 }, // UOP_STACK_RESTORE (16-bit)
{ 0xff, 0xf8, &Decoder::opcode_11111000 }, // UOP_STACK_RESTORE (16-bit)
{ 0xff, 0xf9, &Decoder::opcode_11111001 }, // UOP_STACK_RESTORE (32-bit)
{ 0xff, 0xfa, &Decoder::opcode_11111010 }, // UOP_STACK_RESTORE (32-bit)
{ 0xff, 0xfb, &Decoder::opcode_11111011 }, // UOP_NOP (16-bit)
{ 0xff, 0xfc, &Decoder::opcode_11111100 }, // UOP_NOP (32-bit)
{ 0xff, 0xfd, &Decoder::opcode_11111101 }, // UOP_NOP (16-bit) / END
{ 0xff, 0xfe, &Decoder::opcode_11111110 }, // UOP_NOP (32-bit) / END
{ 0xff, 0xff, &Decoder::opcode_11111111 }, // UOP_END
};
void Decoder::printRegisters(const std::pair<uint16_t, uint32_t> &RegisterMask) {
static const char * const GPRRegisterNames[16] = {
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
"r11", "ip", "sp", "lr", "pc",
};
const uint16_t GPRMask = std::get<0>(RegisterMask);
const uint16_t VFPMask = std::get<1>(RegisterMask);
OS << '{';
bool Comma = false;
for (unsigned RI = 0, RE = 11; RI < RE; ++RI) {
if (GPRMask & (1 << RI)) {
if (Comma)
OS << ", ";
OS << GPRRegisterNames[RI];
Comma = true;
}
}
for (unsigned RI = 0, RE = 32; RI < RE; ++RI) {
if (VFPMask & (1 << RI)) {
if (Comma)
OS << ", ";
OS << "d" << unsigned(RI);
Comma = true;
}
}
for (unsigned RI = 11, RE = 16; RI < RE; ++RI) {
if (GPRMask & (1 << RI)) {
if (Comma)
OS << ", ";
OS << GPRRegisterNames[RI];
Comma = true;
}
}
OS << '}';
}
ErrorOr<object::SectionRef>
Decoder::getSectionContaining(const COFFObjectFile &COFF, uint64_t VA) {
for (const auto &Section : COFF.sections()) {
uint64_t Address = Section.getAddress();
uint64_t Size = Section.getSize();
if (VA >= Address && (VA - Address) <= Size)
return Section;
}
return readobj_error::unknown_symbol;
}
ErrorOr<object::SymbolRef> Decoder::getSymbol(const COFFObjectFile &COFF,
uint64_t VA, bool FunctionOnly) {
for (const auto &Symbol : COFF.symbols()) {
if (FunctionOnly && Symbol.getType() != SymbolRef::ST_Function)
continue;
uint64_t Address;
if (std::error_code EC = Symbol.getAddress(Address))
return EC;
if (Address == VA)
return Symbol;
}
return readobj_error::unknown_symbol;
}
ErrorOr<SymbolRef> Decoder::getRelocatedSymbol(const COFFObjectFile &,
const SectionRef &Section,
uint64_t Offset) {
for (const auto &Relocation : Section.relocations()) {
uint64_t RelocationOffset;
if (auto Error = Relocation.getOffset(RelocationOffset))
return Error;
if (RelocationOffset == Offset)
return *Relocation.getSymbol();
}
return readobj_error::unknown_symbol;
}
bool Decoder::opcode_0xxxxxxx(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
uint8_t Imm = OC[Offset] & 0x7f;
SW.startLine() << format("0x%02x ; %s sp, #(%u * 4)\n",
OC[Offset],
static_cast<const char *>(Prologue ? "sub" : "add"),
Imm);
++Offset;
return false;
}
bool Decoder::opcode_10Lxxxxx(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
unsigned Link = (OC[Offset] & 0x20) >> 5;
uint16_t RegisterMask = (Link << (Prologue ? 14 : 15))
| ((OC[Offset + 0] & 0x1f) << 8)
| ((OC[Offset + 1] & 0xff) << 0);
assert((~RegisterMask & (1 << 13)) && "sp must not be set");
assert((~RegisterMask & (1 << (Prologue ? 15 : 14))) && "pc must not be set");
SW.startLine() << format("0x%02x 0x%02x ; %s.w ",
OC[Offset + 0], OC[Offset + 1],
Prologue ? "push" : "pop");
printRegisters(std::make_pair(RegisterMask, 0));
OS << '\n';
++Offset, ++Offset;
return false;
}
bool Decoder::opcode_1100xxxx(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
if (Prologue)
SW.startLine() << format("0x%02x ; mov r%u, sp\n",
OC[Offset], OC[Offset] & 0xf);
else
SW.startLine() << format("0x%02x ; mov sp, r%u\n",
OC[Offset], OC[Offset] & 0xf);
++Offset;
return false;
}
bool Decoder::opcode_11010Lxx(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
unsigned Link = (OC[Offset] & 0x4) >> 3;
unsigned Count = (OC[Offset] & 0x3);
uint16_t GPRMask = (Link << (Prologue ? 14 : 15))
| (((1 << (Count + 1)) - 1) << 4);
SW.startLine() << format("0x%02x ; %s ", OC[Offset],
Prologue ? "push" : "pop");
printRegisters(std::make_pair(GPRMask, 0));
OS << '\n';
++Offset;
return false;
}
bool Decoder::opcode_11011Lxx(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
unsigned Link = (OC[Offset] & 0x4) >> 2;
unsigned Count = (OC[Offset] & 0x3) + 4;
uint16_t GPRMask = (Link << (Prologue ? 14 : 15))
| (((1 << (Count + 1)) - 1) << 4);
SW.startLine() << format("0x%02x ; %s.w ", OC[Offset],
Prologue ? "push" : "pop");
printRegisters(std::make_pair(GPRMask, 0));
OS << '\n';
++Offset;
return false;
}
bool Decoder::opcode_11100xxx(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
unsigned High = (OC[Offset] & 0x7);
uint32_t VFPMask = (((1 << (High + 1)) - 1) << 8);
SW.startLine() << format("0x%02x ; %s ", OC[Offset],
Prologue ? "vpush" : "vpop");
printRegisters(std::make_pair(0, VFPMask));
OS << '\n';
++Offset;
return false;
}
bool Decoder::opcode_111010xx(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
uint16_t Imm = ((OC[Offset + 0] & 0x03) << 8) | ((OC[Offset + 1] & 0xff) << 0);
SW.startLine() << format("0x%02x 0x%02x ; %s.w sp, #(%u * 4)\n",
OC[Offset + 0], OC[Offset + 1],
static_cast<const char *>(Prologue ? "sub" : "add"),
Imm);
++Offset, ++Offset;
return false;
}
bool Decoder::opcode_1110110L(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
uint8_t GPRMask = ((OC[Offset + 0] & 0x01) << (Prologue ? 14 : 15))
| ((OC[Offset + 1] & 0xff) << 0);
SW.startLine() << format("0x%02x 0x%02x ; %s ", OC[Offset + 0],
OC[Offset + 1], Prologue ? "push" : "pop");
printRegisters(std::make_pair(GPRMask, 0));
OS << '\n';
++Offset, ++Offset;
return false;
}
bool Decoder::opcode_11101110(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
assert(!Prologue && "may not be used in prologue");
if (OC[Offset + 1] & 0xf0)
SW.startLine() << format("0x%02x 0x%02x ; reserved\n",
OC[Offset + 0], OC[Offset + 1]);
else
SW.startLine()
<< format("0x%02x 0x%02x ; microsoft-specific (type: %u)\n",
OC[Offset + 0], OC[Offset + 1], OC[Offset + 1] & 0x0f);
++Offset, ++Offset;
return false;
}
bool Decoder::opcode_11101111(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
assert(!Prologue && "may not be used in prologue");
if (OC[Offset + 1] & 0xf0)
SW.startLine() << format("0x%02x 0x%02x ; reserved\n",
OC[Offset + 0], OC[Offset + 1]);
else
SW.startLine()
<< format("0x%02x 0x%02x ; ldr.w lr, [sp], #%u\n",
OC[Offset + 0], OC[Offset + 1], OC[Offset + 1] << 2);
++Offset, ++Offset;
return false;
}
bool Decoder::opcode_11110101(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
unsigned Start = (OC[Offset + 1] & 0xf0) >> 4;
unsigned End = (OC[Offset + 1] & 0x0f) >> 0;
uint32_t VFPMask = ((1 << (End - Start)) - 1) << Start;
SW.startLine() << format("0x%02x 0x%02x ; %s ", OC[Offset + 0],
OC[Offset + 1], Prologue ? "vpush" : "vpop");
printRegisters(std::make_pair(0, VFPMask));
OS << '\n';
++Offset, ++Offset;
return false;
}
bool Decoder::opcode_11110110(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
unsigned Start = (OC[Offset + 1] & 0xf0) >> 4;
unsigned End = (OC[Offset + 1] & 0x0f) >> 0;
uint32_t VFPMask = ((1 << (End - Start)) - 1) << 16;
SW.startLine() << format("0x%02x 0x%02x ; %s ", OC[Offset + 0],
OC[Offset + 1], Prologue ? "vpush" : "vpop");
printRegisters(std::make_pair(0, VFPMask));
OS << '\n';
++Offset, ++Offset;
return false;
}
bool Decoder::opcode_11110111(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
uint32_t Imm = (OC[Offset + 1] << 8) | (OC[Offset + 2] << 0);
SW.startLine() << format("0x%02x 0x%02x 0x%02x ; %s sp, sp, #(%u * 4)\n",
OC[Offset + 0], OC[Offset + 1], OC[Offset + 2],
static_cast<const char *>(Prologue ? "sub" : "add"),
Imm);
++Offset, ++Offset, ++Offset;
return false;
}
bool Decoder::opcode_11111000(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
uint32_t Imm = (OC[Offset + 1] << 16)
| (OC[Offset + 2] << 8)
| (OC[Offset + 3] << 0);
SW.startLine()
<< format("0x%02x 0x%02x 0x%02x 0x%02x ; %s sp, sp, #(%u * 4)\n",
OC[Offset + 0], OC[Offset + 1], OC[Offset + 2], OC[Offset + 3],
static_cast<const char *>(Prologue ? "sub" : "add"), Imm);
++Offset, ++Offset, ++Offset, ++Offset;
return false;
}
bool Decoder::opcode_11111001(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
uint32_t Imm = (OC[Offset + 1] << 8) | (OC[Offset + 2] << 0);
SW.startLine()
<< format("0x%02x 0x%02x 0x%02x ; %s.w sp, sp, #(%u * 4)\n",
OC[Offset + 0], OC[Offset + 1], OC[Offset + 2],
static_cast<const char *>(Prologue ? "sub" : "add"), Imm);
++Offset, ++Offset, ++Offset;
return false;
}
bool Decoder::opcode_11111010(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
uint32_t Imm = (OC[Offset + 1] << 16)
| (OC[Offset + 2] << 8)
| (OC[Offset + 3] << 0);
SW.startLine()
<< format("0x%02x 0x%02x 0x%02x 0x%02x ; %s.w sp, sp, #(%u * 4)\n",
OC[Offset + 0], OC[Offset + 1], OC[Offset + 2], OC[Offset + 3],
static_cast<const char *>(Prologue ? "sub" : "add"), Imm);
++Offset, ++Offset, ++Offset, ++Offset;
return false;
}
bool Decoder::opcode_11111011(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
SW.startLine() << format("0x%02x ; nop\n", OC[Offset]);
++Offset;
return false;
}
bool Decoder::opcode_11111100(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
SW.startLine() << format("0x%02x ; nop.w\n", OC[Offset]);
++Offset;
return false;
}
bool Decoder::opcode_11111101(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
SW.startLine() << format("0x%02x ; b\n", OC[Offset]);
++Offset;
return true;
}
bool Decoder::opcode_11111110(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
SW.startLine() << format("0x%02x ; b.w\n", OC[Offset]);
++Offset;
return true;
}
bool Decoder::opcode_11111111(const uint8_t *OC, unsigned &Offset,
unsigned Length, bool Prologue) {
++Offset;
return true;
}
void Decoder::decodeOpcodes(ArrayRef<uint8_t> Opcodes, unsigned Offset,
bool Prologue) {
assert((!Prologue || Offset == 0) && "prologue should always use offset 0");
bool Terminated = false;
for (unsigned OI = Offset, OE = Opcodes.size(); !Terminated && OI < OE; ) {
for (unsigned DI = 0;; ++DI) {
if ((Opcodes[OI] & Ring[DI].Mask) == Ring[DI].Value) {
Terminated = (this->*Ring[DI].Routine)(Opcodes.data(), OI, 0, Prologue);
break;
}
assert(DI < array_lengthof(Ring) && "unhandled opcode");
}
}
}
bool Decoder::dumpXDataRecord(const COFFObjectFile &COFF,
const SectionRef &Section,
uint64_t FunctionAddress, uint64_t VA) {
ArrayRef<uint8_t> Contents;
if (COFF.getSectionContents(COFF.getCOFFSection(Section), Contents))
return false;
uint64_t SectionVA = Section.getAddress();
uint64_t Offset = VA - SectionVA;
const ulittle32_t *Data =
reinterpret_cast<const ulittle32_t *>(Contents.data() + Offset);
const ExceptionDataRecord XData(Data);
DictScope XRS(SW, "ExceptionData");
SW.printNumber("FunctionLength", XData.FunctionLength() << 1);
SW.printNumber("Version", XData.Vers());
SW.printBoolean("ExceptionData", XData.X());
SW.printBoolean("EpiloguePacked", XData.E());
SW.printBoolean("Fragment", XData.F());
SW.printNumber(XData.E() ? "EpilogueOffset" : "EpilogueScopes",
XData.EpilogueCount());
SW.printNumber("ByteCodeLength",
static_cast<uint64_t>(XData.CodeWords() * sizeof(uint32_t)));
if (XData.E()) {
ArrayRef<uint8_t> UC = XData.UnwindByteCode();
if (!XData.F()) {
ListScope PS(SW, "Prologue");
decodeOpcodes(UC, 0, /*Prologue=*/true);
}
if (XData.EpilogueCount()) {
ListScope ES(SW, "Epilogue");
decodeOpcodes(UC, XData.EpilogueCount(), /*Prologue=*/false);
}
} else {
ArrayRef<ulittle32_t> EpilogueScopes = XData.EpilogueScopes();
ListScope ESS(SW, "EpilogueScopes");
for (const EpilogueScope ES : EpilogueScopes) {
DictScope ESES(SW, "EpilogueScope");
SW.printNumber("StartOffset", ES.EpilogueStartOffset());
SW.printNumber("Condition", ES.Condition());
SW.printNumber("EpilogueStartIndex", ES.EpilogueStartIndex());
ListScope Opcodes(SW, "Opcodes");
decodeOpcodes(XData.UnwindByteCode(), ES.EpilogueStartIndex(),
/*Prologue=*/false);
}
}
if (XData.X()) {
const uint32_t Address = XData.ExceptionHandlerRVA();
const uint32_t Parameter = XData.ExceptionHandlerParameter();
const size_t HandlerOffset = HeaderWords(XData)
+ (XData.E() ? 0 : XData.EpilogueCount())
+ XData.CodeWords();
ErrorOr<SymbolRef> Symbol =
getRelocatedSymbol(COFF, Section, HandlerOffset * sizeof(uint32_t));
if (!Symbol)
Symbol = getSymbol(COFF, Address, /*FunctionOnly=*/true);
StringRef Name;
if (Symbol)
Symbol->getName(Name);
ListScope EHS(SW, "ExceptionHandler");
SW.printString("Routine", formatSymbol(Name, Address));
SW.printHex("Parameter", Parameter);
}
return true;
}
bool Decoder::dumpUnpackedEntry(const COFFObjectFile &COFF,
const SectionRef Section, uint64_t Offset,
unsigned Index, const RuntimeFunction &RF) {
assert(RF.Flag() == RuntimeFunctionFlag::RFF_Unpacked &&
"packed entry cannot be treated as an unpacked entry");
ErrorOr<SymbolRef> Function = getRelocatedSymbol(COFF, Section, Offset);
if (!Function)
Function = getSymbol(COFF, RF.BeginAddress, /*FunctionOnly=*/true);
ErrorOr<SymbolRef> XDataRecord = getRelocatedSymbol(COFF, Section, Offset + 4);
if (!XDataRecord)
XDataRecord = getSymbol(COFF, RF.ExceptionInformationRVA());
if (!RF.BeginAddress && !Function)
return false;
if (!RF.UnwindData && !XDataRecord)
return false;
StringRef FunctionName;
uint64_t FunctionAddress;
if (Function) {
Function->getName(FunctionName);
Function->getAddress(FunctionAddress);
} else {
const pe32_header *PEHeader;
if (COFF.getPE32Header(PEHeader))
return false;
FunctionAddress = PEHeader->ImageBase + RF.BeginAddress;
}
SW.printString("Function", formatSymbol(FunctionName, FunctionAddress));
if (XDataRecord) {
StringRef Name;
uint64_t Address;
XDataRecord->getName(Name);
XDataRecord->getAddress(Address);
SW.printString("ExceptionRecord", formatSymbol(Name, Address));
section_iterator SI = COFF.section_end();
if (XDataRecord->getSection(SI))
return false;
return dumpXDataRecord(COFF, *SI, FunctionAddress, Address);
} else {
const pe32_header *PEHeader;
if (COFF.getPE32Header(PEHeader))
return false;
uint64_t Address = PEHeader->ImageBase + RF.ExceptionInformationRVA();
SW.printString("ExceptionRecord", formatSymbol("", Address));
ErrorOr<SectionRef> Section =
getSectionContaining(COFF, RF.ExceptionInformationRVA());
if (!Section)
return false;
return dumpXDataRecord(COFF, *Section, FunctionAddress,
RF.ExceptionInformationRVA());
}
}
bool Decoder::dumpPackedEntry(const object::COFFObjectFile &COFF,
const SectionRef Section, uint64_t Offset,
unsigned Index, const RuntimeFunction &RF) {
assert((RF.Flag() == RuntimeFunctionFlag::RFF_Packed ||
RF.Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
"unpacked entry cannot be treated as a packed entry");
ErrorOr<SymbolRef> Function = getRelocatedSymbol(COFF, Section, Offset);
if (!Function)
Function = getSymbol(COFF, RF.BeginAddress, /*FunctionOnly=*/true);
StringRef FunctionName;
uint64_t FunctionAddress;
if (Function) {
Function->getName(FunctionName);
Function->getAddress(FunctionAddress);
} else {
const pe32_header *PEHeader;
if (COFF.getPE32Header(PEHeader))
return false;
FunctionAddress = PEHeader->ImageBase + RF.BeginAddress;
}
SW.printString("Function", formatSymbol(FunctionName, FunctionAddress));
SW.printBoolean("Fragment",
RF.Flag() == RuntimeFunctionFlag::RFF_PackedFragment);
SW.printNumber("FunctionLength", RF.FunctionLength());
SW.startLine() << "ReturnType: " << RF.Ret() << '\n';
SW.printBoolean("HomedParameters", RF.H());
SW.startLine() << "SavedRegisters: ";
printRegisters(SavedRegisterMask(RF));
OS << '\n';
SW.printNumber("StackAdjustment", StackAdjustment(RF) << 2);
return true;
}
bool Decoder::dumpProcedureDataEntry(const COFFObjectFile &COFF,
const SectionRef Section, unsigned Index,
ArrayRef<uint8_t> Contents) {
uint64_t Offset = PDataEntrySize * Index;
const ulittle32_t *Data =
reinterpret_cast<const ulittle32_t *>(Contents.data() + Offset);
const RuntimeFunction Entry(Data);
DictScope RFS(SW, "RuntimeFunction");
if (Entry.Flag() == RuntimeFunctionFlag::RFF_Unpacked)
return dumpUnpackedEntry(COFF, Section, Offset, Index, Entry);
return dumpPackedEntry(COFF, Section, Offset, Index, Entry);
}
void Decoder::dumpProcedureData(const COFFObjectFile &COFF,
const SectionRef Section) {
ArrayRef<uint8_t> Contents;
if (COFF.getSectionContents(COFF.getCOFFSection(Section), Contents))
return;
if (Contents.size() % PDataEntrySize) {
errs() << ".pdata content is not " << PDataEntrySize << "-byte aligned\n";
return;
}
for (unsigned EI = 0, EE = Contents.size() / PDataEntrySize; EI < EE; ++EI)
if (!dumpProcedureDataEntry(COFF, Section, EI, Contents))
break;
}
std::error_code Decoder::dumpProcedureData(const COFFObjectFile &COFF) {
for (const auto &Section : COFF.sections()) {
StringRef SectionName;
if (std::error_code EC =
COFF.getSectionName(COFF.getCOFFSection(Section), SectionName))
return EC;
if (SectionName.startswith(".pdata"))
dumpProcedureData(COFF, Section);
}
return std::error_code();
}
}
}
}
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