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4b28ee2088
If there are no legal integers, assume 1 byte. This makes more sense than using the pointer size as a guess for the maximum GPR width. It is conceivable to want to use some 64-bit pointers on a target where 64-bit integers aren't legal. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190817 91177308-0d34-0410-b5e6-96231b3b80d8
706 lines
24 KiB
C++
706 lines
24 KiB
C++
//===-- DataLayout.cpp - Data size & alignment routines --------------------==//
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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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//
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// This file defines layout properties related to datatype size/offset/alignment
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// information.
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//
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// This structure should be created once, filled in if the defaults are not
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// correct and then passed around by const&. None of the members functions
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// require modification to the object.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/DataLayout.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/GetElementPtrTypeIterator.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/Mutex.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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#include <cstdlib>
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using namespace llvm;
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// Handle the Pass registration stuff necessary to use DataLayout's.
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// Register the default SparcV9 implementation...
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INITIALIZE_PASS(DataLayout, "datalayout", "Data Layout", false, true)
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char DataLayout::ID = 0;
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//===----------------------------------------------------------------------===//
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// Support for StructLayout
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//===----------------------------------------------------------------------===//
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StructLayout::StructLayout(StructType *ST, const DataLayout &DL) {
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assert(!ST->isOpaque() && "Cannot get layout of opaque structs");
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StructAlignment = 0;
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StructSize = 0;
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NumElements = ST->getNumElements();
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// Loop over each of the elements, placing them in memory.
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for (unsigned i = 0, e = NumElements; i != e; ++i) {
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Type *Ty = ST->getElementType(i);
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unsigned TyAlign = ST->isPacked() ? 1 : DL.getABITypeAlignment(Ty);
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// Add padding if necessary to align the data element properly.
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if ((StructSize & (TyAlign-1)) != 0)
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StructSize = DataLayout::RoundUpAlignment(StructSize, TyAlign);
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// Keep track of maximum alignment constraint.
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StructAlignment = std::max(TyAlign, StructAlignment);
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MemberOffsets[i] = StructSize;
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StructSize += DL.getTypeAllocSize(Ty); // Consume space for this data item
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}
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// Empty structures have alignment of 1 byte.
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if (StructAlignment == 0) StructAlignment = 1;
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// Add padding to the end of the struct so that it could be put in an array
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// and all array elements would be aligned correctly.
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if ((StructSize & (StructAlignment-1)) != 0)
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StructSize = DataLayout::RoundUpAlignment(StructSize, StructAlignment);
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}
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/// getElementContainingOffset - Given a valid offset into the structure,
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/// return the structure index that contains it.
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unsigned StructLayout::getElementContainingOffset(uint64_t Offset) const {
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const uint64_t *SI =
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std::upper_bound(&MemberOffsets[0], &MemberOffsets[NumElements], Offset);
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assert(SI != &MemberOffsets[0] && "Offset not in structure type!");
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--SI;
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assert(*SI <= Offset && "upper_bound didn't work");
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assert((SI == &MemberOffsets[0] || *(SI-1) <= Offset) &&
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(SI+1 == &MemberOffsets[NumElements] || *(SI+1) > Offset) &&
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"Upper bound didn't work!");
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// Multiple fields can have the same offset if any of them are zero sized.
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// For example, in { i32, [0 x i32], i32 }, searching for offset 4 will stop
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// at the i32 element, because it is the last element at that offset. This is
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// the right one to return, because anything after it will have a higher
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// offset, implying that this element is non-empty.
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return SI-&MemberOffsets[0];
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}
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//===----------------------------------------------------------------------===//
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// LayoutAlignElem, LayoutAlign support
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//===----------------------------------------------------------------------===//
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LayoutAlignElem
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LayoutAlignElem::get(AlignTypeEnum align_type, unsigned abi_align,
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unsigned pref_align, uint32_t bit_width) {
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assert(abi_align <= pref_align && "Preferred alignment worse than ABI!");
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LayoutAlignElem retval;
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retval.AlignType = align_type;
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retval.ABIAlign = abi_align;
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retval.PrefAlign = pref_align;
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retval.TypeBitWidth = bit_width;
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return retval;
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}
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bool
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LayoutAlignElem::operator==(const LayoutAlignElem &rhs) const {
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return (AlignType == rhs.AlignType
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&& ABIAlign == rhs.ABIAlign
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&& PrefAlign == rhs.PrefAlign
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&& TypeBitWidth == rhs.TypeBitWidth);
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}
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const LayoutAlignElem
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DataLayout::InvalidAlignmentElem = LayoutAlignElem::get(INVALID_ALIGN, 0, 0, 0);
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//===----------------------------------------------------------------------===//
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// PointerAlignElem, PointerAlign support
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//===----------------------------------------------------------------------===//
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PointerAlignElem
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PointerAlignElem::get(uint32_t addr_space, unsigned abi_align,
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unsigned pref_align, uint32_t bit_width) {
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assert(abi_align <= pref_align && "Preferred alignment worse than ABI!");
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PointerAlignElem retval;
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retval.AddressSpace = addr_space;
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retval.ABIAlign = abi_align;
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retval.PrefAlign = pref_align;
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retval.TypeBitWidth = bit_width;
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return retval;
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}
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bool
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PointerAlignElem::operator==(const PointerAlignElem &rhs) const {
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return (ABIAlign == rhs.ABIAlign
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&& AddressSpace == rhs.AddressSpace
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&& PrefAlign == rhs.PrefAlign
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&& TypeBitWidth == rhs.TypeBitWidth);
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}
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const PointerAlignElem
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DataLayout::InvalidPointerElem = PointerAlignElem::get(~0U, 0U, 0U, 0U);
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//===----------------------------------------------------------------------===//
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// DataLayout Class Implementation
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//===----------------------------------------------------------------------===//
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void DataLayout::init(StringRef Desc) {
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initializeDataLayoutPass(*PassRegistry::getPassRegistry());
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LayoutMap = 0;
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LittleEndian = false;
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StackNaturalAlign = 0;
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// Default alignments
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setAlignment(INTEGER_ALIGN, 1, 1, 1); // i1
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setAlignment(INTEGER_ALIGN, 1, 1, 8); // i8
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setAlignment(INTEGER_ALIGN, 2, 2, 16); // i16
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setAlignment(INTEGER_ALIGN, 4, 4, 32); // i32
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setAlignment(INTEGER_ALIGN, 4, 8, 64); // i64
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setAlignment(FLOAT_ALIGN, 2, 2, 16); // half
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setAlignment(FLOAT_ALIGN, 4, 4, 32); // float
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setAlignment(FLOAT_ALIGN, 8, 8, 64); // double
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setAlignment(FLOAT_ALIGN, 16, 16, 128); // ppcf128, quad, ...
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setAlignment(VECTOR_ALIGN, 8, 8, 64); // v2i32, v1i64, ...
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setAlignment(VECTOR_ALIGN, 16, 16, 128); // v16i8, v8i16, v4i32, ...
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setAlignment(AGGREGATE_ALIGN, 0, 8, 0); // struct
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setPointerAlignment(0, 8, 8, 8);
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parseSpecifier(Desc);
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}
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/// Checked version of split, to ensure mandatory subparts.
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static std::pair<StringRef, StringRef> split(StringRef Str, char Separator) {
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assert(!Str.empty() && "parse error, string can't be empty here");
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std::pair<StringRef, StringRef> Split = Str.split(Separator);
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assert((!Split.second.empty() || Split.first == Str) &&
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"a trailing separator is not allowed");
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return Split;
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}
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/// Get an unsinged integer, including error checks.
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static unsigned getInt(StringRef R) {
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unsigned Result;
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bool error = R.getAsInteger(10, Result); (void)error;
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assert(!error && "not a number, or does not fit in an unsigned int");
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return Result;
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}
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/// Convert bits into bytes. Assert if not a byte width multiple.
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static unsigned inBytes(unsigned Bits) {
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assert(Bits % 8 == 0 && "number of bits must be a byte width multiple");
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return Bits / 8;
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}
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void DataLayout::parseSpecifier(StringRef Desc) {
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while (!Desc.empty()) {
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// Split at '-'.
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std::pair<StringRef, StringRef> Split = split(Desc, '-');
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Desc = Split.second;
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// Split at ':'.
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Split = split(Split.first, ':');
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// Aliases used below.
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StringRef &Tok = Split.first; // Current token.
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StringRef &Rest = Split.second; // The rest of the string.
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char Specifier = Tok.front();
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Tok = Tok.substr(1);
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switch (Specifier) {
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case 'E':
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LittleEndian = false;
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break;
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case 'e':
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LittleEndian = true;
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break;
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case 'p': {
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// Address space.
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unsigned AddrSpace = Tok.empty() ? 0 : getInt(Tok);
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assert(AddrSpace < 1 << 24 &&
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"Invalid address space, must be a 24bit integer");
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// Size.
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Split = split(Rest, ':');
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unsigned PointerMemSize = inBytes(getInt(Tok));
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// ABI alignment.
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Split = split(Rest, ':');
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unsigned PointerABIAlign = inBytes(getInt(Tok));
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// Preferred alignment.
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unsigned PointerPrefAlign = PointerABIAlign;
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if (!Rest.empty()) {
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Split = split(Rest, ':');
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PointerPrefAlign = inBytes(getInt(Tok));
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}
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setPointerAlignment(AddrSpace, PointerABIAlign, PointerPrefAlign,
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PointerMemSize);
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break;
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}
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case 'i':
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case 'v':
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case 'f':
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case 'a':
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case 's': {
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AlignTypeEnum AlignType;
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switch (Specifier) {
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default:
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case 'i': AlignType = INTEGER_ALIGN; break;
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case 'v': AlignType = VECTOR_ALIGN; break;
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case 'f': AlignType = FLOAT_ALIGN; break;
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case 'a': AlignType = AGGREGATE_ALIGN; break;
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case 's': AlignType = STACK_ALIGN; break;
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}
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// Bit size.
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unsigned Size = Tok.empty() ? 0 : getInt(Tok);
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// ABI alignment.
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Split = split(Rest, ':');
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unsigned ABIAlign = inBytes(getInt(Tok));
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// Preferred alignment.
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unsigned PrefAlign = ABIAlign;
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if (!Rest.empty()) {
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Split = split(Rest, ':');
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PrefAlign = inBytes(getInt(Tok));
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}
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setAlignment(AlignType, ABIAlign, PrefAlign, Size);
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break;
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}
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case 'n': // Native integer types.
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for (;;) {
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unsigned Width = getInt(Tok);
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assert(Width != 0 && "width must be non-zero");
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LegalIntWidths.push_back(Width);
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if (Rest.empty())
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break;
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Split = split(Rest, ':');
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}
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break;
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case 'S': { // Stack natural alignment.
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StackNaturalAlign = inBytes(getInt(Tok));
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break;
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}
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default:
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llvm_unreachable("Unknown specifier in datalayout string");
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break;
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}
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}
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}
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/// Default ctor.
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///
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/// @note This has to exist, because this is a pass, but it should never be
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/// used.
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DataLayout::DataLayout() : ImmutablePass(ID) {
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report_fatal_error("Bad DataLayout ctor used. "
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"Tool did not specify a DataLayout to use?");
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}
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DataLayout::DataLayout(const Module *M)
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: ImmutablePass(ID) {
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init(M->getDataLayout());
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}
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void
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DataLayout::setAlignment(AlignTypeEnum align_type, unsigned abi_align,
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unsigned pref_align, uint32_t bit_width) {
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assert(abi_align <= pref_align && "Preferred alignment worse than ABI!");
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assert(pref_align < (1 << 16) && "Alignment doesn't fit in bitfield");
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assert(bit_width < (1 << 24) && "Bit width doesn't fit in bitfield");
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for (unsigned i = 0, e = Alignments.size(); i != e; ++i) {
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if (Alignments[i].AlignType == (unsigned)align_type &&
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Alignments[i].TypeBitWidth == bit_width) {
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// Update the abi, preferred alignments.
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Alignments[i].ABIAlign = abi_align;
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Alignments[i].PrefAlign = pref_align;
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return;
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}
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}
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Alignments.push_back(LayoutAlignElem::get(align_type, abi_align,
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pref_align, bit_width));
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}
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void
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DataLayout::setPointerAlignment(uint32_t addr_space, unsigned abi_align,
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unsigned pref_align, uint32_t bit_width) {
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assert(abi_align <= pref_align && "Preferred alignment worse than ABI!");
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DenseMap<unsigned,PointerAlignElem>::iterator val = Pointers.find(addr_space);
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if (val == Pointers.end()) {
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Pointers[addr_space] = PointerAlignElem::get(addr_space,
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abi_align, pref_align, bit_width);
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} else {
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val->second.ABIAlign = abi_align;
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val->second.PrefAlign = pref_align;
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val->second.TypeBitWidth = bit_width;
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}
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}
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/// getAlignmentInfo - Return the alignment (either ABI if ABIInfo = true or
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/// preferred if ABIInfo = false) the layout wants for the specified datatype.
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unsigned DataLayout::getAlignmentInfo(AlignTypeEnum AlignType,
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uint32_t BitWidth, bool ABIInfo,
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Type *Ty) const {
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// Check to see if we have an exact match and remember the best match we see.
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int BestMatchIdx = -1;
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int LargestInt = -1;
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for (unsigned i = 0, e = Alignments.size(); i != e; ++i) {
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if (Alignments[i].AlignType == (unsigned)AlignType &&
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Alignments[i].TypeBitWidth == BitWidth)
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return ABIInfo ? Alignments[i].ABIAlign : Alignments[i].PrefAlign;
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// The best match so far depends on what we're looking for.
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if (AlignType == INTEGER_ALIGN &&
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Alignments[i].AlignType == INTEGER_ALIGN) {
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// The "best match" for integers is the smallest size that is larger than
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// the BitWidth requested.
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if (Alignments[i].TypeBitWidth > BitWidth && (BestMatchIdx == -1 ||
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Alignments[i].TypeBitWidth < Alignments[BestMatchIdx].TypeBitWidth))
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BestMatchIdx = i;
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// However, if there isn't one that's larger, then we must use the
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// largest one we have (see below)
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if (LargestInt == -1 ||
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Alignments[i].TypeBitWidth > Alignments[LargestInt].TypeBitWidth)
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LargestInt = i;
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}
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}
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// Okay, we didn't find an exact solution. Fall back here depending on what
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// is being looked for.
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if (BestMatchIdx == -1) {
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// If we didn't find an integer alignment, fall back on most conservative.
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if (AlignType == INTEGER_ALIGN) {
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BestMatchIdx = LargestInt;
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} else {
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assert(AlignType == VECTOR_ALIGN && "Unknown alignment type!");
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// By default, use natural alignment for vector types. This is consistent
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// with what clang and llvm-gcc do.
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unsigned Align = getTypeAllocSize(cast<VectorType>(Ty)->getElementType());
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Align *= cast<VectorType>(Ty)->getNumElements();
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// If the alignment is not a power of 2, round up to the next power of 2.
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// This happens for non-power-of-2 length vectors.
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if (Align & (Align-1))
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Align = NextPowerOf2(Align);
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return Align;
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}
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}
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// Since we got a "best match" index, just return it.
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return ABIInfo ? Alignments[BestMatchIdx].ABIAlign
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: Alignments[BestMatchIdx].PrefAlign;
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}
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namespace {
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class StructLayoutMap {
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typedef DenseMap<StructType*, StructLayout*> LayoutInfoTy;
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LayoutInfoTy LayoutInfo;
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public:
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virtual ~StructLayoutMap() {
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// Remove any layouts.
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for (LayoutInfoTy::iterator I = LayoutInfo.begin(), E = LayoutInfo.end();
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I != E; ++I) {
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StructLayout *Value = I->second;
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Value->~StructLayout();
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free(Value);
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}
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}
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StructLayout *&operator[](StructType *STy) {
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return LayoutInfo[STy];
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}
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// for debugging...
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virtual void dump() const {}
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};
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} // end anonymous namespace
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DataLayout::~DataLayout() {
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delete static_cast<StructLayoutMap*>(LayoutMap);
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}
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bool DataLayout::doFinalization(Module &M) {
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delete static_cast<StructLayoutMap*>(LayoutMap);
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LayoutMap = 0;
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return false;
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}
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const StructLayout *DataLayout::getStructLayout(StructType *Ty) const {
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if (!LayoutMap)
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LayoutMap = new StructLayoutMap();
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StructLayoutMap *STM = static_cast<StructLayoutMap*>(LayoutMap);
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StructLayout *&SL = (*STM)[Ty];
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if (SL) return SL;
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// Otherwise, create the struct layout. Because it is variable length, we
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// malloc it, then use placement new.
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int NumElts = Ty->getNumElements();
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StructLayout *L =
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(StructLayout *)malloc(sizeof(StructLayout)+(NumElts-1) * sizeof(uint64_t));
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// Set SL before calling StructLayout's ctor. The ctor could cause other
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// entries to be added to TheMap, invalidating our reference.
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SL = L;
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new (L) StructLayout(Ty, *this);
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return L;
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}
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std::string DataLayout::getStringRepresentation() const {
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std::string Result;
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raw_string_ostream OS(Result);
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OS << (LittleEndian ? "e" : "E");
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SmallVector<unsigned, 8> addrSpaces;
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// Lets get all of the known address spaces and sort them
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// into increasing order so that we can emit the string
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// in a cleaner format.
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for (DenseMap<unsigned, PointerAlignElem>::const_iterator
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pib = Pointers.begin(), pie = Pointers.end();
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pib != pie; ++pib) {
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addrSpaces.push_back(pib->first);
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}
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std::sort(addrSpaces.begin(), addrSpaces.end());
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for (SmallVectorImpl<unsigned>::iterator asb = addrSpaces.begin(),
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ase = addrSpaces.end(); asb != ase; ++asb) {
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const PointerAlignElem &PI = Pointers.find(*asb)->second;
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OS << "-p";
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if (PI.AddressSpace) {
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OS << PI.AddressSpace;
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}
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OS << ":" << PI.TypeBitWidth*8 << ':' << PI.ABIAlign*8
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<< ':' << PI.PrefAlign*8;
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}
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OS << "-S" << StackNaturalAlign*8;
|
|
|
|
for (unsigned i = 0, e = Alignments.size(); i != e; ++i) {
|
|
const LayoutAlignElem &AI = Alignments[i];
|
|
OS << '-' << (char)AI.AlignType << AI.TypeBitWidth << ':'
|
|
<< AI.ABIAlign*8 << ':' << 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];
|
|
}
|
|
return OS.str();
|
|
}
|
|
|
|
unsigned DataLayout::getPointerTypeSizeInBits(Type *Ty) const {
|
|
assert(Ty->isPtrOrPtrVectorTy() &&
|
|
"This should only be called with a pointer or pointer vector type");
|
|
|
|
if (Ty->isPointerTy())
|
|
return getTypeSizeInBits(Ty);
|
|
|
|
return getTypeSizeInBits(Ty->getScalarType());
|
|
}
|
|
|
|
/*!
|
|
\param abi_or_pref Flag that determines which alignment is returned. true
|
|
returns the ABI alignment, false returns the preferred alignment.
|
|
\param Ty The underlying type for which alignment is determined.
|
|
|
|
Get the ABI (\a abi_or_pref == true) or preferred alignment (\a abi_or_pref
|
|
== false) for the requested type \a Ty.
|
|
*/
|
|
unsigned DataLayout::getAlignment(Type *Ty, bool abi_or_pref) const {
|
|
int AlignType = -1;
|
|
|
|
assert(Ty->isSized() && "Cannot getTypeInfo() on a type that is unsized!");
|
|
switch (Ty->getTypeID()) {
|
|
// Early escape for the non-numeric types.
|
|
case Type::LabelTyID:
|
|
return (abi_or_pref
|
|
? getPointerABIAlignment(0)
|
|
: getPointerPrefAlignment(0));
|
|
case Type::PointerTyID: {
|
|
unsigned AS = dyn_cast<PointerType>(Ty)->getAddressSpace();
|
|
return (abi_or_pref
|
|
? getPointerABIAlignment(AS)
|
|
: getPointerPrefAlignment(AS));
|
|
}
|
|
case Type::ArrayTyID:
|
|
return getAlignment(cast<ArrayType>(Ty)->getElementType(), abi_or_pref);
|
|
|
|
case Type::StructTyID: {
|
|
// Packed structure types always have an ABI alignment of one.
|
|
if (cast<StructType>(Ty)->isPacked() && abi_or_pref)
|
|
return 1;
|
|
|
|
// Get the layout annotation... which is lazily created on demand.
|
|
const StructLayout *Layout = getStructLayout(cast<StructType>(Ty));
|
|
unsigned Align = getAlignmentInfo(AGGREGATE_ALIGN, 0, abi_or_pref, Ty);
|
|
return std::max(Align, Layout->getAlignment());
|
|
}
|
|
case Type::IntegerTyID:
|
|
AlignType = INTEGER_ALIGN;
|
|
break;
|
|
case Type::HalfTyID:
|
|
case Type::FloatTyID:
|
|
case Type::DoubleTyID:
|
|
// PPC_FP128TyID and FP128TyID have different data contents, but the
|
|
// same size and alignment, so they look the same here.
|
|
case Type::PPC_FP128TyID:
|
|
case Type::FP128TyID:
|
|
case Type::X86_FP80TyID:
|
|
AlignType = FLOAT_ALIGN;
|
|
break;
|
|
case Type::X86_MMXTyID:
|
|
case Type::VectorTyID:
|
|
AlignType = VECTOR_ALIGN;
|
|
break;
|
|
default:
|
|
llvm_unreachable("Bad type for getAlignment!!!");
|
|
}
|
|
|
|
return getAlignmentInfo((AlignTypeEnum)AlignType, getTypeSizeInBits(Ty),
|
|
abi_or_pref, Ty);
|
|
}
|
|
|
|
unsigned DataLayout::getABITypeAlignment(Type *Ty) const {
|
|
return getAlignment(Ty, true);
|
|
}
|
|
|
|
/// getABIIntegerTypeAlignment - Return the minimum ABI-required alignment for
|
|
/// an integer type of the specified bitwidth.
|
|
unsigned DataLayout::getABIIntegerTypeAlignment(unsigned BitWidth) const {
|
|
return getAlignmentInfo(INTEGER_ALIGN, BitWidth, true, 0);
|
|
}
|
|
|
|
unsigned DataLayout::getCallFrameTypeAlignment(Type *Ty) const {
|
|
for (unsigned i = 0, e = Alignments.size(); i != e; ++i)
|
|
if (Alignments[i].AlignType == STACK_ALIGN)
|
|
return Alignments[i].ABIAlign;
|
|
|
|
return getABITypeAlignment(Ty);
|
|
}
|
|
|
|
unsigned DataLayout::getPrefTypeAlignment(Type *Ty) const {
|
|
return getAlignment(Ty, false);
|
|
}
|
|
|
|
unsigned DataLayout::getPreferredTypeAlignmentShift(Type *Ty) const {
|
|
unsigned Align = getPrefTypeAlignment(Ty);
|
|
assert(!(Align & (Align-1)) && "Alignment is not a power of two!");
|
|
return Log2_32(Align);
|
|
}
|
|
|
|
IntegerType *DataLayout::getIntPtrType(LLVMContext &C,
|
|
unsigned AddressSpace) const {
|
|
return IntegerType::get(C, getPointerSizeInBits(AddressSpace));
|
|
}
|
|
|
|
Type *DataLayout::getIntPtrType(Type *Ty) const {
|
|
assert(Ty->isPtrOrPtrVectorTy() &&
|
|
"Expected a pointer or pointer vector type.");
|
|
unsigned NumBits = getTypeSizeInBits(Ty->getScalarType());
|
|
IntegerType *IntTy = IntegerType::get(Ty->getContext(), NumBits);
|
|
if (VectorType *VecTy = dyn_cast<VectorType>(Ty))
|
|
return VectorType::get(IntTy, VecTy->getNumElements());
|
|
return IntTy;
|
|
}
|
|
|
|
Type *DataLayout::getSmallestLegalIntType(LLVMContext &C, unsigned Width) const {
|
|
for (unsigned i = 0, e = (unsigned)LegalIntWidths.size(); i != e; ++i)
|
|
if (Width <= LegalIntWidths[i])
|
|
return Type::getIntNTy(C, LegalIntWidths[i]);
|
|
return 0;
|
|
}
|
|
|
|
unsigned DataLayout::getLargestLegalIntTypeSize() const {
|
|
unsigned MaxWidth = 0;
|
|
for (unsigned i = 0, e = (unsigned)LegalIntWidths.size(); i != e; ++i)
|
|
MaxWidth = std::max<unsigned>(MaxWidth, LegalIntWidths[i]);
|
|
return MaxWidth;
|
|
}
|
|
|
|
uint64_t DataLayout::getIndexedOffset(Type *ptrTy,
|
|
ArrayRef<Value *> Indices) const {
|
|
Type *Ty = ptrTy;
|
|
assert(Ty->isPointerTy() && "Illegal argument for getIndexedOffset()");
|
|
uint64_t Result = 0;
|
|
|
|
generic_gep_type_iterator<Value* const*>
|
|
TI = gep_type_begin(ptrTy, Indices);
|
|
for (unsigned CurIDX = 0, EndIDX = Indices.size(); CurIDX != EndIDX;
|
|
++CurIDX, ++TI) {
|
|
if (StructType *STy = dyn_cast<StructType>(*TI)) {
|
|
assert(Indices[CurIDX]->getType() ==
|
|
Type::getInt32Ty(ptrTy->getContext()) &&
|
|
"Illegal struct idx");
|
|
unsigned FieldNo = cast<ConstantInt>(Indices[CurIDX])->getZExtValue();
|
|
|
|
// Get structure layout information...
|
|
const StructLayout *Layout = getStructLayout(STy);
|
|
|
|
// Add in the offset, as calculated by the structure layout info...
|
|
Result += Layout->getElementOffset(FieldNo);
|
|
|
|
// Update Ty to refer to current element
|
|
Ty = STy->getElementType(FieldNo);
|
|
} else {
|
|
// Update Ty to refer to current element
|
|
Ty = cast<SequentialType>(Ty)->getElementType();
|
|
|
|
// Get the array index and the size of each array element.
|
|
if (int64_t arrayIdx = cast<ConstantInt>(Indices[CurIDX])->getSExtValue())
|
|
Result += (uint64_t)arrayIdx * getTypeAllocSize(Ty);
|
|
}
|
|
}
|
|
|
|
return Result;
|
|
}
|
|
|
|
/// getPreferredAlignment - Return the preferred alignment of the specified
|
|
/// global. This includes an explicitly requested alignment (if the global
|
|
/// has one).
|
|
unsigned DataLayout::getPreferredAlignment(const GlobalVariable *GV) const {
|
|
Type *ElemType = GV->getType()->getElementType();
|
|
unsigned Alignment = getPrefTypeAlignment(ElemType);
|
|
unsigned GVAlignment = GV->getAlignment();
|
|
if (GVAlignment >= Alignment) {
|
|
Alignment = GVAlignment;
|
|
} else if (GVAlignment != 0) {
|
|
Alignment = std::max(GVAlignment, getABITypeAlignment(ElemType));
|
|
}
|
|
|
|
if (GV->hasInitializer() && GVAlignment == 0) {
|
|
if (Alignment < 16) {
|
|
// If the global is not external, see if it is large. If so, give it a
|
|
// larger alignment.
|
|
if (getTypeSizeInBits(ElemType) > 128)
|
|
Alignment = 16; // 16-byte alignment.
|
|
}
|
|
}
|
|
return Alignment;
|
|
}
|
|
|
|
/// getPreferredAlignmentLog - Return the preferred alignment of the
|
|
/// specified global, returned in log form. This includes an explicitly
|
|
/// requested alignment (if the global has one).
|
|
unsigned DataLayout::getPreferredAlignmentLog(const GlobalVariable *GV) const {
|
|
return Log2_32(getPreferredAlignment(GV));
|
|
}
|