forked from OSchip/llvm-project
394 lines
11 KiB
C++
394 lines
11 KiB
C++
//===--- TargetInfo.cpp - Information about Target machine ----------------===//
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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 implements the TargetInfo and TargetInfoImpl interfaces.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Basic/TargetInfo.h"
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#include "clang/Basic/LangOptions.h"
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#include "llvm/ADT/APFloat.h"
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#include "llvm/ADT/STLExtras.h"
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#include <cstdlib>
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using namespace clang;
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// TargetInfo Constructor.
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TargetInfo::TargetInfo(const std::string &T) : Triple(T) {
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// Set defaults. Defaults are set for a 32-bit RISC platform, like PPC or
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// SPARC. These should be overridden by concrete targets as needed.
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TLSSupported = true;
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NoAsmVariants = false;
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PointerWidth = PointerAlign = 32;
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IntWidth = IntAlign = 32;
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LongWidth = LongAlign = 32;
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LongLongWidth = LongLongAlign = 64;
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FloatWidth = 32;
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FloatAlign = 32;
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DoubleWidth = 64;
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DoubleAlign = 64;
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LongDoubleWidth = 64;
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LongDoubleAlign = 64;
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LargeArrayMinWidth = 0;
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LargeArrayAlign = 0;
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SizeType = UnsignedLong;
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PtrDiffType = SignedLong;
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IntMaxType = SignedLongLong;
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UIntMaxType = UnsignedLongLong;
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IntPtrType = SignedLong;
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WCharType = SignedInt;
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WIntType = SignedInt;
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Char16Type = UnsignedShort;
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Char32Type = UnsignedInt;
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Int64Type = SignedLongLong;
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SigAtomicType = SignedInt;
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UseBitFieldTypeAlignment = true;
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FloatFormat = &llvm::APFloat::IEEEsingle;
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DoubleFormat = &llvm::APFloat::IEEEdouble;
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LongDoubleFormat = &llvm::APFloat::IEEEdouble;
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DescriptionString = "E-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-"
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"i64:64:64-f32:32:32-f64:64:64-n32";
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UserLabelPrefix = "_";
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HasAlignMac68kSupport = false;
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// Default to no types using fpret.
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RealTypeUsesObjCFPRet = 0;
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}
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// Out of line virtual dtor for TargetInfo.
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TargetInfo::~TargetInfo() {}
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/// getTypeName - Return the user string for the specified integer type enum.
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/// For example, SignedShort -> "short".
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const char *TargetInfo::getTypeName(IntType T) {
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switch (T) {
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default: assert(0 && "not an integer!");
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case SignedShort: return "short";
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case UnsignedShort: return "unsigned short";
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case SignedInt: return "int";
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case UnsignedInt: return "unsigned int";
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case SignedLong: return "long int";
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case UnsignedLong: return "long unsigned int";
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case SignedLongLong: return "long long int";
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case UnsignedLongLong: return "long long unsigned int";
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}
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}
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/// getTypeConstantSuffix - Return the constant suffix for the specified
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/// integer type enum. For example, SignedLong -> "L".
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const char *TargetInfo::getTypeConstantSuffix(IntType T) {
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switch (T) {
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default: assert(0 && "not an integer!");
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case SignedShort:
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case SignedInt: return "";
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case SignedLong: return "L";
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case SignedLongLong: return "LL";
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case UnsignedShort:
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case UnsignedInt: return "U";
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case UnsignedLong: return "UL";
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case UnsignedLongLong: return "ULL";
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}
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}
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/// getTypeWidth - Return the width (in bits) of the specified integer type
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/// enum. For example, SignedInt -> getIntWidth().
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unsigned TargetInfo::getTypeWidth(IntType T) const {
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switch (T) {
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default: assert(0 && "not an integer!");
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case SignedShort:
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case UnsignedShort: return getShortWidth();
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case SignedInt:
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case UnsignedInt: return getIntWidth();
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case SignedLong:
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case UnsignedLong: return getLongWidth();
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case SignedLongLong:
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case UnsignedLongLong: return getLongLongWidth();
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};
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}
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/// getTypeAlign - Return the alignment (in bits) of the specified integer type
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/// enum. For example, SignedInt -> getIntAlign().
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unsigned TargetInfo::getTypeAlign(IntType T) const {
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switch (T) {
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default: assert(0 && "not an integer!");
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case SignedShort:
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case UnsignedShort: return getShortAlign();
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case SignedInt:
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case UnsignedInt: return getIntAlign();
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case SignedLong:
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case UnsignedLong: return getLongAlign();
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case SignedLongLong:
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case UnsignedLongLong: return getLongLongAlign();
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};
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}
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/// isTypeSigned - Return whether an integer types is signed. Returns true if
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/// the type is signed; false otherwise.
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bool TargetInfo::isTypeSigned(IntType T) const {
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switch (T) {
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default: assert(0 && "not an integer!");
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case SignedShort:
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case SignedInt:
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case SignedLong:
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case SignedLongLong:
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return true;
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case UnsignedShort:
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case UnsignedInt:
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case UnsignedLong:
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case UnsignedLongLong:
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return false;
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};
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}
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/// setForcedLangOptions - Set forced language options.
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/// Apply changes to the target information with respect to certain
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/// language options which change the target configuration.
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void TargetInfo::setForcedLangOptions(LangOptions &Opts) {
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if (Opts.NoBitFieldTypeAlign)
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UseBitFieldTypeAlignment = false;
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if (Opts.ShortWChar)
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WCharType = UnsignedShort;
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}
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//===----------------------------------------------------------------------===//
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static llvm::StringRef removeGCCRegisterPrefix(llvm::StringRef Name) {
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if (Name[0] == '%' || Name[0] == '#')
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Name = Name.substr(1);
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return Name;
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}
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/// isValidGCCRegisterName - Returns whether the passed in string
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/// is a valid register name according to GCC. This is used by Sema for
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/// inline asm statements.
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bool TargetInfo::isValidGCCRegisterName(llvm::StringRef Name) const {
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if (Name.empty())
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return false;
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const char * const *Names;
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unsigned NumNames;
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// Get rid of any register prefix.
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Name = removeGCCRegisterPrefix(Name);
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if (Name == "memory" || Name == "cc")
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return true;
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getGCCRegNames(Names, NumNames);
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// If we have a number it maps to an entry in the register name array.
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if (isdigit(Name[0])) {
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int n;
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if (!Name.getAsInteger(0, n))
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return n >= 0 && (unsigned)n < NumNames;
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}
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// Check register names.
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for (unsigned i = 0; i < NumNames; i++) {
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if (Name == Names[i])
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return true;
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}
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// Now check aliases.
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const GCCRegAlias *Aliases;
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unsigned NumAliases;
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getGCCRegAliases(Aliases, NumAliases);
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for (unsigned i = 0; i < NumAliases; i++) {
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for (unsigned j = 0 ; j < llvm::array_lengthof(Aliases[i].Aliases); j++) {
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if (!Aliases[i].Aliases[j])
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break;
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if (Aliases[i].Aliases[j] == Name)
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return true;
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}
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}
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return false;
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}
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llvm::StringRef
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TargetInfo::getNormalizedGCCRegisterName(llvm::StringRef Name) const {
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assert(isValidGCCRegisterName(Name) && "Invalid register passed in");
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// Get rid of any register prefix.
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Name = removeGCCRegisterPrefix(Name);
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const char * const *Names;
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unsigned NumNames;
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getGCCRegNames(Names, NumNames);
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// First, check if we have a number.
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if (isdigit(Name[0])) {
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int n;
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if (!Name.getAsInteger(0, n)) {
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assert(n >= 0 && (unsigned)n < NumNames &&
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"Out of bounds register number!");
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return Names[n];
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}
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}
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// Now check aliases.
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const GCCRegAlias *Aliases;
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unsigned NumAliases;
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getGCCRegAliases(Aliases, NumAliases);
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for (unsigned i = 0; i < NumAliases; i++) {
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for (unsigned j = 0 ; j < llvm::array_lengthof(Aliases[i].Aliases); j++) {
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if (!Aliases[i].Aliases[j])
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break;
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if (Aliases[i].Aliases[j] == Name)
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return Aliases[i].Register;
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}
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}
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return Name;
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}
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bool TargetInfo::validateOutputConstraint(ConstraintInfo &Info) const {
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const char *Name = Info.getConstraintStr().c_str();
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// An output constraint must start with '=' or '+'
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if (*Name != '=' && *Name != '+')
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return false;
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if (*Name == '+')
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Info.setIsReadWrite();
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Name++;
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while (*Name) {
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switch (*Name) {
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default:
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if (!validateAsmConstraint(Name, Info)) {
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// FIXME: We temporarily return false
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// so we can add more constraints as we hit it.
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// Eventually, an unknown constraint should just be treated as 'g'.
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return false;
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}
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case '&': // early clobber.
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break;
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case '%': // commutative.
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// FIXME: Check that there is a another register after this one.
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break;
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case 'r': // general register.
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Info.setAllowsRegister();
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break;
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case 'm': // memory operand.
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Info.setAllowsMemory();
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break;
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case 'g': // general register, memory operand or immediate integer.
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case 'X': // any operand.
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Info.setAllowsRegister();
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Info.setAllowsMemory();
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break;
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case ',': // FIXME: Until we handle multiple alternative constraints,
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return true; // ignore everything after the first comma.
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}
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Name++;
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}
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return true;
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}
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bool TargetInfo::resolveSymbolicName(const char *&Name,
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ConstraintInfo *OutputConstraints,
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unsigned NumOutputs,
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unsigned &Index) const {
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assert(*Name == '[' && "Symbolic name did not start with '['");
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Name++;
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const char *Start = Name;
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while (*Name && *Name != ']')
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Name++;
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if (!*Name) {
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// Missing ']'
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return false;
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}
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std::string SymbolicName(Start, Name - Start);
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for (Index = 0; Index != NumOutputs; ++Index)
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if (SymbolicName == OutputConstraints[Index].getName())
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return true;
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return false;
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}
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bool TargetInfo::validateInputConstraint(ConstraintInfo *OutputConstraints,
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unsigned NumOutputs,
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ConstraintInfo &Info) const {
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const char *Name = Info.ConstraintStr.c_str();
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while (*Name) {
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switch (*Name) {
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default:
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// Check if we have a matching constraint
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if (*Name >= '0' && *Name <= '9') {
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unsigned i = *Name - '0';
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// Check if matching constraint is out of bounds.
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if (i >= NumOutputs)
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return false;
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// The constraint should have the same info as the respective
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// output constraint.
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Info.setTiedOperand(i, OutputConstraints[i]);
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} else if (!validateAsmConstraint(Name, Info)) {
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// FIXME: This error return is in place temporarily so we can
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// add more constraints as we hit it. Eventually, an unknown
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// constraint should just be treated as 'g'.
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return false;
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}
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break;
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case '[': {
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unsigned Index = 0;
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if (!resolveSymbolicName(Name, OutputConstraints, NumOutputs, Index))
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return false;
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break;
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}
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case '%': // commutative
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// FIXME: Fail if % is used with the last operand.
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break;
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case 'i': // immediate integer.
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case 'n': // immediate integer with a known value.
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break;
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case 'I': // Various constant constraints with target-specific meanings.
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case 'J':
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case 'K':
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case 'L':
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case 'M':
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case 'N':
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case 'O':
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case 'P':
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break;
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case 'r': // general register.
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Info.setAllowsRegister();
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break;
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case 'm': // memory operand.
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case 'o': // offsettable memory operand
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case 'V': // non-offsettable memory operand
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Info.setAllowsMemory();
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break;
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case 'g': // general register, memory operand or immediate integer.
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case 'X': // any operand.
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Info.setAllowsRegister();
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Info.setAllowsMemory();
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break;
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case ',': // FIXME: Until we handle multiple alternative constraints,
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return true; // ignore everything after the first comma.
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}
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Name++;
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}
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return true;
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}
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