#include <cstdlib>
using namespace llvm;
-// Handle the Pass registration stuff necessary to use DataLayout's.
-
-INITIALIZE_PASS(DataLayoutPass, "datalayout", "Data Layout", false, true)
-char DataLayoutPass::ID = 0;
-
//===----------------------------------------------------------------------===//
// Support for StructLayout
//===----------------------------------------------------------------------===//
assert(!ST->isOpaque() && "Cannot get layout of opaque structs");
StructAlignment = 0;
StructSize = 0;
+ IsPadded = false;
NumElements = ST->getNumElements();
// Loop over each of the elements, placing them in memory.
unsigned TyAlign = ST->isPacked() ? 1 : DL.getABITypeAlignment(Ty);
// Add padding if necessary to align the data element properly.
- if ((StructSize & (TyAlign-1)) != 0)
+ if ((StructSize & (TyAlign-1)) != 0) {
+ IsPadded = true;
StructSize = RoundUpToAlignment(StructSize, TyAlign);
+ }
// Keep track of maximum alignment constraint.
StructAlignment = std::max(TyAlign, StructAlignment);
// Add padding to the end of the struct so that it could be put in an array
// and all array elements would be aligned correctly.
- if ((StructSize & (StructAlignment-1)) != 0)
+ if ((StructSize & (StructAlignment-1)) != 0) {
+ IsPadded = true;
StructSize = RoundUpToAlignment(StructSize, StructAlignment);
+ }
}
const char *DataLayout::getManglingComponent(const Triple &T) {
if (T.isOSBinFormatMachO())
return "-m:o";
- if (T.isOSWindows() && T.getArch() == Triple::x86 && T.isOSBinFormatCOFF())
- return "-m:w";
+ if (T.isOSWindows() && T.isOSBinFormatCOFF())
+ return T.getArch() == Triple::x86 ? "-m:x" : "-m:w";
return "-m:e";
}
static std::pair<StringRef, StringRef> split(StringRef Str, char Separator) {
assert(!Str.empty() && "parse error, string can't be empty here");
std::pair<StringRef, StringRef> Split = Str.split(Separator);
- assert((!Split.second.empty() || Split.first == Str) &&
- "a trailing separator is not allowed");
+ if (Split.second.empty() && Split.first != Str)
+ report_fatal_error("Trailing separator in datalayout string");
+ if (!Split.second.empty() && Split.first.empty())
+ report_fatal_error("Expected token before separator in datalayout string");
return Split;
}
/// Convert bits into bytes. Assert if not a byte width multiple.
static unsigned inBytes(unsigned Bits) {
- assert(Bits % 8 == 0 && "number of bits must be a byte width multiple");
+ if (Bits % 8)
+ report_fatal_error("number of bits must be a byte width multiple");
return Bits / 8;
}
void DataLayout::parseSpecifier(StringRef Desc) {
+ StringRepresentation = Desc;
while (!Desc.empty()) {
// Split at '-'.
std::pair<StringRef, StringRef> Split = split(Desc, '-');
case 'p': {
// Address space.
unsigned AddrSpace = Tok.empty() ? 0 : getInt(Tok);
- assert(AddrSpace < 1 << 24 &&
- "Invalid address space, must be a 24bit integer");
+ if (!isUInt<24>(AddrSpace))
+ report_fatal_error("Invalid address space, must be a 24bit integer");
// Size.
+ if (Rest.empty())
+ report_fatal_error(
+ "Missing size specification for pointer in datalayout string");
Split = split(Rest, ':');
unsigned PointerMemSize = inBytes(getInt(Tok));
+ if (!PointerMemSize)
+ report_fatal_error("Invalid pointer size of 0 bytes");
// ABI alignment.
+ if (Rest.empty())
+ report_fatal_error(
+ "Missing alignment specification for pointer in datalayout string");
Split = split(Rest, ':');
unsigned PointerABIAlign = inBytes(getInt(Tok));
+ if (!isPowerOf2_64(PointerABIAlign))
+ report_fatal_error(
+ "Pointer ABI alignment must be a power of 2");
// Preferred alignment.
unsigned PointerPrefAlign = PointerABIAlign;
if (!Rest.empty()) {
Split = split(Rest, ':');
PointerPrefAlign = inBytes(getInt(Tok));
+ if (!isPowerOf2_64(PointerPrefAlign))
+ report_fatal_error(
+ "Pointer preferred alignment must be a power of 2");
}
setPointerAlignment(AddrSpace, PointerABIAlign, PointerPrefAlign,
// Bit size.
unsigned Size = Tok.empty() ? 0 : getInt(Tok);
- assert((AlignType != AGGREGATE_ALIGN || Size == 0) &&
- "These specifications don't have a size");
+ if (AlignType == AGGREGATE_ALIGN && Size != 0)
+ report_fatal_error(
+ "Sized aggregate specification in datalayout string");
// ABI alignment.
+ if (Rest.empty())
+ report_fatal_error(
+ "Missing alignment specification in datalayout string");
Split = split(Rest, ':');
unsigned ABIAlign = inBytes(getInt(Tok));
+ if (AlignType != AGGREGATE_ALIGN && !ABIAlign)
+ report_fatal_error(
+ "ABI alignment specification must be >0 for non-aggregate types");
// Preferred alignment.
unsigned PrefAlign = ABIAlign;
case 'n': // Native integer types.
for (;;) {
unsigned Width = getInt(Tok);
- assert(Width != 0 && "width must be non-zero");
+ if (Width == 0)
+ report_fatal_error(
+ "Zero width native integer type in datalayout string");
LegalIntWidths.push_back(Width);
if (Rest.empty())
break;
break;
}
case 'm':
- assert(Tok.empty());
- assert(Rest.size() == 1);
+ if (!Tok.empty())
+ report_fatal_error("Unexpected trailing characters after mangling specifier in datalayout string");
+ if (Rest.empty())
+ report_fatal_error("Expected mangling specifier in datalayout string");
+ if (Rest.size() > 1)
+ report_fatal_error("Unknown mangling specifier in datalayout string");
switch(Rest[0]) {
default:
- llvm_unreachable("Unknown mangling in datalayout string");
+ report_fatal_error("Unknown mangling in datalayout string");
case 'e':
ManglingMode = MM_ELF;
break;
ManglingMode = MM_Mips;
break;
case 'w':
- ManglingMode = MM_WINCOFF;
+ ManglingMode = MM_WinCOFF;
+ break;
+ case 'x':
+ ManglingMode = MM_WinCOFFX86;
break;
}
break;
default:
- llvm_unreachable("Unknown specifier in datalayout string");
+ report_fatal_error("Unknown specifier in datalayout string");
break;
}
}
init(M);
}
-void DataLayout::init(const Module *M) {
- const DataLayout *Other = M->getDataLayout();
- if (Other)
- *this = *Other;
- else
- reset("");
-}
+void DataLayout::init(const Module *M) { *this = M->getDataLayout(); }
bool DataLayout::operator==(const DataLayout &Other) const {
bool Ret = BigEndian == Other.BigEndian &&
ManglingMode == Other.ManglingMode &&
LegalIntWidths == Other.LegalIntWidths &&
Alignments == Other.Alignments && Pointers == Other.Pointers;
- assert(Ret == (getStringRepresentation() == Other.getStringRepresentation()));
+ // Note: getStringRepresentation() might differs, it is not canonicalized
return Ret;
}
void
DataLayout::setAlignment(AlignTypeEnum align_type, unsigned abi_align,
unsigned pref_align, uint32_t bit_width) {
- assert(abi_align <= pref_align && "Preferred alignment worse than ABI!");
- assert(pref_align < (1 << 16) && "Alignment doesn't fit in bitfield");
- assert(bit_width < (1 << 24) && "Bit width doesn't fit in bitfield");
+ if (!isUInt<24>(bit_width))
+ report_fatal_error("Invalid bit width, must be a 24bit integer");
+ if (!isUInt<16>(abi_align))
+ report_fatal_error("Invalid ABI alignment, must be a 16bit integer");
+ if (!isUInt<16>(pref_align))
+ report_fatal_error("Invalid preferred alignment, must be a 16bit integer");
+ if (abi_align != 0 && !isPowerOf2_64(abi_align))
+ report_fatal_error("Invalid ABI alignment, must be a power of 2");
+ if (pref_align != 0 && !isPowerOf2_64(pref_align))
+ report_fatal_error("Invalid preferred alignment, must be a power of 2");
+
+ if (pref_align < abi_align)
+ report_fatal_error(
+ "Preferred alignment cannot be less than the ABI alignment");
+
for (LayoutAlignElem &Elem : Alignments) {
if (Elem.AlignType == (unsigned)align_type &&
Elem.TypeBitWidth == bit_width) {
void DataLayout::setPointerAlignment(uint32_t AddrSpace, unsigned ABIAlign,
unsigned PrefAlign,
uint32_t TypeByteWidth) {
- assert(ABIAlign <= PrefAlign && "Preferred alignment worse than ABI!");
+ if (PrefAlign < ABIAlign)
+ report_fatal_error(
+ "Preferred alignment cannot be less than the ABI alignment");
+
PointersTy::iterator I = findPointerLowerBound(AddrSpace);
if (I == Pointers.end() || I->AddressSpace != AddrSpace) {
Pointers.insert(I, PointerAlignElem::get(AddrSpace, ABIAlign, PrefAlign,
return ABIInfo ? Alignments[i].ABIAlign : Alignments[i].PrefAlign;
// The best match so far depends on what we're looking for.
- if (AlignType == INTEGER_ALIGN &&
- Alignments[i].AlignType == INTEGER_ALIGN) {
+ if (AlignType == INTEGER_ALIGN &&
+ Alignments[i].AlignType == INTEGER_ALIGN) {
// The "best match" for integers is the smallest size that is larger than
// the BitWidth requested.
if (Alignments[i].TypeBitWidth > BitWidth && (BestMatchIdx == -1 ||
// If we didn't find an integer alignment, fall back on most conservative.
if (AlignType == INTEGER_ALIGN) {
BestMatchIdx = LargestInt;
- } else {
- assert(AlignType == VECTOR_ALIGN && "Unknown alignment type!");
-
+ } else if (AlignType == VECTOR_ALIGN) {
// By default, use natural alignment for vector types. This is consistent
// with what clang and llvm-gcc do.
unsigned Align = getTypeAllocSize(cast<VectorType>(Ty)->getElementType());
}
}
+ // If we still couldn't find a reasonable default alignment, fall back
+ // to a simple heuristic that the alignment is the first power of two
+ // greater-or-equal to the store size of the type. This is a reasonable
+ // approximation of reality, and if the user wanted something less
+ // less conservative, they should have specified it explicitly in the data
+ // layout.
+ if (BestMatchIdx == -1) {
+ unsigned Align = getTypeStoreSize(Ty);
+ if (Align & (Align-1))
+ Align = NextPowerOf2(Align);
+ return Align;
+ }
+
// Since we got a "best match" index, just return it.
return ABIInfo ? Alignments[BestMatchIdx].ABIAlign
: Alignments[BestMatchIdx].PrefAlign;
return L;
}
-std::string DataLayout::getStringRepresentation() const {
- std::string Result;
- raw_string_ostream OS(Result);
-
- OS << (BigEndian ? "E" : "e");
-
- switch (ManglingMode) {
- case MM_None:
- break;
- case MM_ELF:
- OS << "-m:e";
- break;
- case MM_MachO:
- OS << "-m:o";
- break;
- case MM_WINCOFF:
- OS << "-m:w";
- break;
- case MM_Mips:
- OS << "-m:m";
- break;
- }
-
- for (const PointerAlignElem &PI : Pointers) {
- // Skip default.
- if (PI.AddressSpace == 0 && PI.ABIAlign == 8 && PI.PrefAlign == 8 &&
- PI.TypeByteWidth == 8)
- continue;
-
- OS << "-p";
- if (PI.AddressSpace) {
- OS << PI.AddressSpace;
- }
- OS << ":" << PI.TypeByteWidth*8 << ':' << PI.ABIAlign*8;
- if (PI.PrefAlign != PI.ABIAlign)
- OS << ':' << PI.PrefAlign*8;
- }
-
- for (const LayoutAlignElem &AI : Alignments) {
- if (std::find(std::begin(DefaultAlignments), std::end(DefaultAlignments),
- AI) != std::end(DefaultAlignments))
- continue;
- OS << '-' << (char)AI.AlignType;
- if (AI.TypeBitWidth)
- OS << AI.TypeBitWidth;
- OS << ':' << AI.ABIAlign*8;
- if (AI.ABIAlign != AI.PrefAlign)
- OS << ':' << AI.PrefAlign*8;
- }
-
- if (!LegalIntWidths.empty()) {
- OS << "-n" << (unsigned)LegalIntWidths[0];
-
- for (unsigned i = 1, e = LegalIntWidths.size(); i != e; ++i)
- OS << ':' << (unsigned)LegalIntWidths[i];
- }
-
- if (StackNaturalAlign)
- OS << "-S" << StackNaturalAlign*8;
-
- return OS.str();
-}
unsigned DataLayout::getPointerABIAlignment(unsigned AS) const {
PointersTy::const_iterator I = findPointerLowerBound(AS);
return Log2_32(getPreferredAlignment(GV));
}
-DataLayoutPass::DataLayoutPass() : ImmutablePass(ID), DL("") {
- initializeDataLayoutPassPass(*PassRegistry::getPassRegistry());
-}
-
-DataLayoutPass::~DataLayoutPass() {}
-
-bool DataLayoutPass::doInitialization(Module &M) {
- DL.init(&M);
- return false;
-}
-
-bool DataLayoutPass::doFinalization(Module &M) {
- DL.reset("");
- return false;
-}
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