mirror of
https://github.com/RPCSX/llvm.git
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d102593b42
to get the alignment of global variables, rather than using hand-made versions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46495 91177308-0d34-0410-b5e6-96231b3b80d8
607 lines
22 KiB
C++
607 lines
22 KiB
C++
//===-- TargetData.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 target 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/Target/TargetData.h"
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#include "llvm/Module.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Constants.h"
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#include "llvm/Support/GetElementPtrTypeIterator.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringExtras.h"
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#include <algorithm>
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#include <cstdlib>
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#include <sstream>
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using namespace llvm;
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// Handle the Pass registration stuff necessary to use TargetData's.
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namespace {
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// Register the default SparcV9 implementation...
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RegisterPass<TargetData> X("targetdata", "Target Data Layout");
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}
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char TargetData::ID = 0;
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//===----------------------------------------------------------------------===//
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// Support for StructLayout
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//===----------------------------------------------------------------------===//
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StructLayout::StructLayout(const StructType *ST, const TargetData &TD) {
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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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const Type *Ty = ST->getElementType(i);
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unsigned TyAlign = ST->isPacked() ?
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1 : TD.getABITypeAlignment(Ty);
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uint64_t TySize = ST->isPacked() ?
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TD.getTypeStoreSize(Ty) : TD.getABITypeSize(Ty);
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// Add padding if necessary to align the data element properly...
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StructSize = (StructSize + TyAlign - 1)/TyAlign * 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 += TySize; // 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 != 0)
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StructSize = (StructSize/StructAlignment + 1) * 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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// TargetAlignElem, TargetAlign support
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//===----------------------------------------------------------------------===//
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TargetAlignElem
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TargetAlignElem::get(AlignTypeEnum align_type, unsigned char abi_align,
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unsigned char pref_align, uint32_t bit_width) {
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assert(abi_align <= pref_align && "Preferred alignment worse than ABI!");
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TargetAlignElem 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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TargetAlignElem::operator==(const TargetAlignElem &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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std::ostream &
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TargetAlignElem::dump(std::ostream &os) const {
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return os << AlignType
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<< TypeBitWidth
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<< ":" << (int) (ABIAlign * 8)
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<< ":" << (int) (PrefAlign * 8);
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}
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const TargetAlignElem TargetData::InvalidAlignmentElem =
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TargetAlignElem::get((AlignTypeEnum) -1, 0, 0, 0);
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//===----------------------------------------------------------------------===//
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// TargetData Class Implementation
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//===----------------------------------------------------------------------===//
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/*!
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A TargetDescription string consists of a sequence of hyphen-delimited
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specifiers for target endianness, pointer size and alignments, and various
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primitive type sizes and alignments. A typical string looks something like:
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<br><br>
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"E-p:32:32:32-i1:8:8-i8:8:8-i32:32:32-i64:32:64-f32:32:32-f64:32:64"
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<br><br>
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(note: this string is not fully specified and is only an example.)
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\p
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Alignments come in two flavors: ABI and preferred. ABI alignment (abi_align,
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below) dictates how a type will be aligned within an aggregate and when used
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as an argument. Preferred alignment (pref_align, below) determines a type's
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alignment when emitted as a global.
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\p
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Specifier string details:
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<br><br>
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<i>[E|e]</i>: Endianness. "E" specifies a big-endian target data model, "e"
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specifies a little-endian target data model.
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<br><br>
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<i>p:@verbatim<size>:<abi_align>:<pref_align>@endverbatim</i>: Pointer size,
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ABI and preferred alignment.
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<br><br>
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<i>@verbatim<type><size>:<abi_align>:<pref_align>@endverbatim</i>: Numeric type
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alignment. Type is
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one of <i>i|f|v|a</i>, corresponding to integer, floating point, vector (aka
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packed) or aggregate. Size indicates the size, e.g., 32 or 64 bits.
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\p
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The default string, fully specified is:
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<br><br>
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"E-p:64:64:64-a0:0:0-f32:32:32-f64:0:64"
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"-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:0:64"
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"-v64:64:64-v128:128:128"
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<br><br>
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Note that in the case of aggregates, 0 is the default ABI and preferred
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alignment. This is a special case, where the aggregate's computed worst-case
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alignment will be used.
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*/
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void TargetData::init(const std::string &TargetDescription) {
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std::string temp = TargetDescription;
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LittleEndian = false;
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PointerMemSize = 8;
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PointerABIAlign = 8;
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PointerPrefAlign = PointerABIAlign;
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// Default alignments
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setAlignment(INTEGER_ALIGN, 1, 1, 1); // Bool
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setAlignment(INTEGER_ALIGN, 1, 1, 8); // Byte
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setAlignment(INTEGER_ALIGN, 2, 2, 16); // short
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setAlignment(INTEGER_ALIGN, 4, 4, 32); // int
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setAlignment(INTEGER_ALIGN, 4, 8, 64); // long
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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(VECTOR_ALIGN, 8, 8, 64); // v2i32
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setAlignment(VECTOR_ALIGN, 16, 16, 128); // v16i8, v8i16, v4i32, ...
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setAlignment(AGGREGATE_ALIGN, 0, 8, 0); // struct, union, class, ...
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while (!temp.empty()) {
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std::string token = getToken(temp, "-");
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std::string arg0 = getToken(token, ":");
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const char *p = arg0.c_str();
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switch(*p) {
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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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PointerMemSize = atoi(getToken(token,":").c_str()) / 8;
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PointerABIAlign = atoi(getToken(token,":").c_str()) / 8;
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PointerPrefAlign = atoi(getToken(token,":").c_str()) / 8;
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if (PointerPrefAlign == 0)
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PointerPrefAlign = PointerABIAlign;
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break;
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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 align_type = STACK_ALIGN; // Dummy init, silence warning
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switch(*p) {
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case 'i': align_type = INTEGER_ALIGN; break;
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case 'v': align_type = VECTOR_ALIGN; break;
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case 'f': align_type = FLOAT_ALIGN; break;
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case 'a': align_type = AGGREGATE_ALIGN; break;
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case 's': align_type = STACK_ALIGN; break;
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}
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uint32_t size = (uint32_t) atoi(++p);
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unsigned char abi_align = atoi(getToken(token, ":").c_str()) / 8;
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unsigned char pref_align = atoi(getToken(token, ":").c_str()) / 8;
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if (pref_align == 0)
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pref_align = abi_align;
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setAlignment(align_type, abi_align, pref_align, size);
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break;
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}
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default:
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break;
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}
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}
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}
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TargetData::TargetData(const Module *M)
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: ImmutablePass((intptr_t)&ID) {
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init(M->getDataLayout());
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}
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void
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TargetData::setAlignment(AlignTypeEnum align_type, unsigned char abi_align,
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unsigned char pref_align, uint32_t bit_width) {
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assert(abi_align <= pref_align && "Preferred alignment worse than ABI!");
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for (unsigned i = 0, e = Alignments.size(); i != e; ++i) {
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if (Alignments[i].AlignType == 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(TargetAlignElem::get(align_type, abi_align,
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pref_align, bit_width));
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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 target wants for the specified datatype.
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unsigned TargetData::getAlignmentInfo(AlignTypeEnum AlignType,
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uint32_t BitWidth, bool ABIInfo,
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const 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 == 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 == VECTOR_ALIGN && Alignments[i].AlignType == VECTOR_ALIGN) {
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// If this is a specification for a smaller vector type, we will fall back
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// to it. This happens because <128 x double> can be implemented in terms
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// of 64 <2 x double>.
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if (Alignments[i].TypeBitWidth < BitWidth) {
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// Verify that we pick the biggest of the fallbacks.
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if (BestMatchIdx == -1 ||
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Alignments[BestMatchIdx].TypeBitWidth < Alignments[i].TypeBitWidth)
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BestMatchIdx = i;
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}
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} else 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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// If we didn't find a vector size that is smaller or equal to this type,
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// then we will end up scalarizing this to its element type. Just return
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// the alignment of the element.
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return getAlignment(cast<VectorType>(Ty)->getElementType(), ABIInfo);
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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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/// LayoutInfo - The lazy cache of structure layout information maintained by
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/// TargetData. Note that the struct types must have been free'd before
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/// llvm_shutdown is called (and thus this is deallocated) because all the
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/// targets with cached elements should have been destroyed.
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///
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typedef std::pair<const TargetData*,const StructType*> LayoutKey;
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struct DenseMapLayoutKeyInfo {
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static inline LayoutKey getEmptyKey() { return LayoutKey(0, 0); }
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static inline LayoutKey getTombstoneKey() {
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return LayoutKey((TargetData*)(intptr_t)-1, 0);
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}
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static unsigned getHashValue(const LayoutKey &Val) {
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return DenseMapInfo<void*>::getHashValue(Val.first) ^
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DenseMapInfo<void*>::getHashValue(Val.second);
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}
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static bool isEqual(const LayoutKey &LHS, const LayoutKey &RHS) {
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return LHS == RHS;
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}
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static bool isPod() { return true; }
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};
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typedef DenseMap<LayoutKey, StructLayout*, DenseMapLayoutKeyInfo> LayoutInfoTy;
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static ManagedStatic<LayoutInfoTy> LayoutInfo;
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TargetData::~TargetData() {
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if (LayoutInfo.isConstructed()) {
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// Remove any layouts for this TD.
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LayoutInfoTy &TheMap = *LayoutInfo;
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for (LayoutInfoTy::iterator I = TheMap.begin(), E = TheMap.end();
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I != E; ) {
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if (I->first.first == this) {
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I->second->~StructLayout();
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free(I->second);
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TheMap.erase(I++);
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} else {
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++I;
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}
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}
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}
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}
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const StructLayout *TargetData::getStructLayout(const StructType *Ty) const {
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LayoutInfoTy &TheMap = *LayoutInfo;
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StructLayout *&SL = TheMap[LayoutKey(this, 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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/// InvalidateStructLayoutInfo - TargetData speculatively caches StructLayout
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/// objects. If a TargetData object is alive when types are being refined and
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/// removed, this method must be called whenever a StructType is removed to
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/// avoid a dangling pointer in this cache.
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void TargetData::InvalidateStructLayoutInfo(const StructType *Ty) const {
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if (!LayoutInfo.isConstructed()) return; // No cache.
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LayoutInfoTy::iterator I = LayoutInfo->find(LayoutKey(this, Ty));
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if (I != LayoutInfo->end()) {
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I->second->~StructLayout();
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free(I->second);
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LayoutInfo->erase(I);
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}
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}
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std::string TargetData::getStringRepresentation() const {
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std::string repr;
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repr.append(LittleEndian ? "e" : "E");
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repr.append("-p:").append(itostr((int64_t) (PointerMemSize * 8))).
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append(":").append(itostr((int64_t) (PointerABIAlign * 8))).
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append(":").append(itostr((int64_t) (PointerPrefAlign * 8)));
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for (align_const_iterator I = Alignments.begin();
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I != Alignments.end();
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++I) {
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repr.append("-").append(1, (char) I->AlignType).
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append(utostr((int64_t) I->TypeBitWidth)).
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append(":").append(utostr((uint64_t) (I->ABIAlign * 8))).
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append(":").append(utostr((uint64_t) (I->PrefAlign * 8)));
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}
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return repr;
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}
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uint64_t TargetData::getTypeSizeInBits(const Type *Ty) const {
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assert(Ty->isSized() && "Cannot getTypeInfo() on a type that is unsized!");
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switch (Ty->getTypeID()) {
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case Type::LabelTyID:
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case Type::PointerTyID:
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return getPointerSizeInBits();
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case Type::ArrayTyID: {
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const ArrayType *ATy = cast<ArrayType>(Ty);
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return getABITypeSizeInBits(ATy->getElementType())*ATy->getNumElements();
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}
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case Type::StructTyID: {
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// Get the layout annotation... which is lazily created on demand.
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const StructLayout *Layout = getStructLayout(cast<StructType>(Ty));
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return Layout->getSizeInBits();
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}
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case Type::IntegerTyID:
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return cast<IntegerType>(Ty)->getBitWidth();
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case Type::VoidTyID:
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return 8;
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case Type::FloatTyID:
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return 32;
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case Type::DoubleTyID:
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return 64;
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case Type::PPC_FP128TyID:
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case Type::FP128TyID:
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return 128;
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// In memory objects this is always aligned to a higher boundary, but
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// only 80 bits contain information.
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case Type::X86_FP80TyID:
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return 80;
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case Type::VectorTyID: {
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const VectorType *PTy = cast<VectorType>(Ty);
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return PTy->getBitWidth();
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}
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default:
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assert(0 && "TargetData::getTypeSizeInBits(): Unsupported type");
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break;
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}
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return 0;
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}
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/*!
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\param abi_or_pref Flag that determines which alignment is returned. true
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returns the ABI alignment, false returns the preferred alignment.
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\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 char TargetData::getAlignment(const 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:
|
|
case Type::PointerTyID:
|
|
return (abi_or_pref
|
|
? getPointerABIAlignment()
|
|
: getPointerPrefAlignment());
|
|
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, (unsigned)Layout->getAlignment());
|
|
}
|
|
case Type::IntegerTyID:
|
|
case Type::VoidTyID:
|
|
AlignType = INTEGER_ALIGN;
|
|
break;
|
|
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::VectorTyID:
|
|
AlignType = VECTOR_ALIGN;
|
|
break;
|
|
default:
|
|
assert(0 && "Bad type for getAlignment!!!");
|
|
break;
|
|
}
|
|
|
|
return getAlignmentInfo((AlignTypeEnum)AlignType, getTypeSizeInBits(Ty),
|
|
abi_or_pref, Ty);
|
|
}
|
|
|
|
unsigned char TargetData::getABITypeAlignment(const Type *Ty) const {
|
|
return getAlignment(Ty, true);
|
|
}
|
|
|
|
unsigned char TargetData::getCallFrameTypeAlignment(const 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 char TargetData::getPrefTypeAlignment(const Type *Ty) const {
|
|
return getAlignment(Ty, false);
|
|
}
|
|
|
|
unsigned char TargetData::getPreferredTypeAlignmentShift(const Type *Ty) const {
|
|
unsigned Align = (unsigned) getPrefTypeAlignment(Ty);
|
|
assert(!(Align & (Align-1)) && "Alignment is not a power of two!");
|
|
return Log2_32(Align);
|
|
}
|
|
|
|
/// getIntPtrType - Return an unsigned integer type that is the same size or
|
|
/// greater to the host pointer size.
|
|
const Type *TargetData::getIntPtrType() const {
|
|
return IntegerType::get(getPointerSizeInBits());
|
|
}
|
|
|
|
|
|
uint64_t TargetData::getIndexedOffset(const Type *ptrTy, Value* const* Indices,
|
|
unsigned NumIndices) const {
|
|
const Type *Ty = ptrTy;
|
|
assert(isa<PointerType>(Ty) && "Illegal argument for getIndexedOffset()");
|
|
uint64_t Result = 0;
|
|
|
|
generic_gep_type_iterator<Value* const*>
|
|
TI = gep_type_begin(ptrTy, Indices, Indices+NumIndices);
|
|
for (unsigned CurIDX = 0; CurIDX != NumIndices; ++CurIDX, ++TI) {
|
|
if (const StructType *STy = dyn_cast<StructType>(*TI)) {
|
|
assert(Indices[CurIDX]->getType() == Type::Int32Ty &&
|
|
"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.
|
|
int64_t arrayIdx = cast<ConstantInt>(Indices[CurIDX])->getSExtValue();
|
|
Result += arrayIdx * (int64_t)getABITypeSize(Ty);
|
|
}
|
|
}
|
|
|
|
return Result;
|
|
}
|
|
|
|
/// getPreferredAlignment - Return the preferred alignment of the specified
|
|
/// global. This includes an explicitly requested alignment (if the global
|
|
/// has one).
|
|
unsigned TargetData::getPreferredAlignment(const GlobalVariable *GV) const {
|
|
const Type *ElemType = GV->getType()->getElementType();
|
|
unsigned Alignment = getPrefTypeAlignment(ElemType);
|
|
if (GV->getAlignment() > Alignment)
|
|
Alignment = GV->getAlignment();
|
|
|
|
if (GV->hasInitializer()) {
|
|
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 TargetData::getPreferredAlignmentLog(const GlobalVariable *GV) const {
|
|
return Log2_32(getPreferredAlignment(GV));
|
|
}
|