forked from OSchip/llvm-project
851 lines
32 KiB
C++
851 lines
32 KiB
C++
//===--- SemaStmtAsm.cpp - Semantic Analysis for Asm Statements -----------===//
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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 semantic analysis for inline asm statements.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/AST/ExprCXX.h"
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#include "clang/AST/RecordLayout.h"
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#include "clang/AST/TypeLoc.h"
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#include "clang/Basic/TargetInfo.h"
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#include "clang/Lex/Preprocessor.h"
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#include "clang/Sema/Initialization.h"
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#include "clang/Sema/Lookup.h"
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#include "clang/Sema/Scope.h"
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#include "clang/Sema/ScopeInfo.h"
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#include "clang/Sema/SemaInternal.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/StringSet.h"
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#include "llvm/MC/MCParser/MCAsmParser.h"
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using namespace clang;
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using namespace sema;
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/// CheckAsmLValue - GNU C has an extremely ugly extension whereby they silently
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/// ignore "noop" casts in places where an lvalue is required by an inline asm.
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/// We emulate this behavior when -fheinous-gnu-extensions is specified, but
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/// provide a strong guidance to not use it.
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///
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/// This method checks to see if the argument is an acceptable l-value and
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/// returns false if it is a case we can handle.
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static bool CheckAsmLValue(const Expr *E, Sema &S) {
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// Type dependent expressions will be checked during instantiation.
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if (E->isTypeDependent())
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return false;
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if (E->isLValue())
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return false; // Cool, this is an lvalue.
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// Okay, this is not an lvalue, but perhaps it is the result of a cast that we
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// are supposed to allow.
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const Expr *E2 = E->IgnoreParenNoopCasts(S.Context);
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if (E != E2 && E2->isLValue()) {
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if (!S.getLangOpts().HeinousExtensions)
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S.Diag(E2->getLocStart(), diag::err_invalid_asm_cast_lvalue)
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<< E->getSourceRange();
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else
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S.Diag(E2->getLocStart(), diag::warn_invalid_asm_cast_lvalue)
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<< E->getSourceRange();
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// Accept, even if we emitted an error diagnostic.
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return false;
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}
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// None of the above, just randomly invalid non-lvalue.
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return true;
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}
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/// isOperandMentioned - Return true if the specified operand # is mentioned
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/// anywhere in the decomposed asm string.
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static bool
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isOperandMentioned(unsigned OpNo,
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ArrayRef<GCCAsmStmt::AsmStringPiece> AsmStrPieces) {
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for (unsigned p = 0, e = AsmStrPieces.size(); p != e; ++p) {
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const GCCAsmStmt::AsmStringPiece &Piece = AsmStrPieces[p];
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if (!Piece.isOperand())
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continue;
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// If this is a reference to the input and if the input was the smaller
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// one, then we have to reject this asm.
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if (Piece.getOperandNo() == OpNo)
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return true;
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}
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return false;
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}
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static bool CheckNakedParmReference(Expr *E, Sema &S) {
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FunctionDecl *Func = dyn_cast<FunctionDecl>(S.CurContext);
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if (!Func)
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return false;
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if (!Func->hasAttr<NakedAttr>())
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return false;
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SmallVector<Expr*, 4> WorkList;
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WorkList.push_back(E);
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while (WorkList.size()) {
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Expr *E = WorkList.pop_back_val();
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if (isa<CXXThisExpr>(E)) {
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S.Diag(E->getLocStart(), diag::err_asm_naked_this_ref);
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S.Diag(Func->getAttr<NakedAttr>()->getLocation(), diag::note_attribute);
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return true;
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}
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if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
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if (isa<ParmVarDecl>(DRE->getDecl())) {
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S.Diag(DRE->getLocStart(), diag::err_asm_naked_parm_ref);
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S.Diag(Func->getAttr<NakedAttr>()->getLocation(), diag::note_attribute);
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return true;
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}
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}
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for (Stmt *Child : E->children()) {
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if (Expr *E = dyn_cast_or_null<Expr>(Child))
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WorkList.push_back(E);
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}
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}
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return false;
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}
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/// \brief Returns true if given expression is not compatible with inline
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/// assembly's memory constraint; false otherwise.
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static bool checkExprMemoryConstraintCompat(Sema &S, Expr *E,
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TargetInfo::ConstraintInfo &Info,
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bool is_input_expr) {
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enum {
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ExprBitfield = 0,
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ExprVectorElt,
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ExprGlobalRegVar,
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ExprSafeType
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} EType = ExprSafeType;
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// Bitfields, vector elements and global register variables are not
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// compatible.
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if (E->refersToBitField())
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EType = ExprBitfield;
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else if (E->refersToVectorElement())
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EType = ExprVectorElt;
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else if (E->refersToGlobalRegisterVar())
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EType = ExprGlobalRegVar;
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if (EType != ExprSafeType) {
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S.Diag(E->getLocStart(), diag::err_asm_non_addr_value_in_memory_constraint)
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<< EType << is_input_expr << Info.getConstraintStr()
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<< E->getSourceRange();
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return true;
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}
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return false;
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}
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// Extracting the register name from the Expression value,
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// if there is no register name to extract, returns ""
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static StringRef extractRegisterName(const Expr *Expression,
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const TargetInfo &Target) {
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Expression = Expression->IgnoreImpCasts();
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if (const DeclRefExpr *AsmDeclRef = dyn_cast<DeclRefExpr>(Expression)) {
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// Handle cases where the expression is a variable
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const VarDecl *Variable = dyn_cast<VarDecl>(AsmDeclRef->getDecl());
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if (Variable && Variable->getStorageClass() == SC_Register) {
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if (AsmLabelAttr *Attr = Variable->getAttr<AsmLabelAttr>())
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if (Target.isValidGCCRegisterName(Attr->getLabel()))
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return Target.getNormalizedGCCRegisterName(Attr->getLabel(), true);
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}
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}
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return "";
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}
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// Checks if there is a conflict between the input and output lists with the
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// clobbers list. If there's a conflict, returns the location of the
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// conflicted clobber, else returns nullptr
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static SourceLocation
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getClobberConflictLocation(MultiExprArg Exprs, StringLiteral **Constraints,
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StringLiteral **Clobbers, int NumClobbers,
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const TargetInfo &Target, ASTContext &Cont) {
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llvm::StringSet<> InOutVars;
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// Collect all the input and output registers from the extended asm
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// statement in order to check for conflicts with the clobber list
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for (unsigned int i = 0; i < Exprs.size(); ++i) {
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StringRef Constraint = Constraints[i]->getString();
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StringRef InOutReg = Target.getConstraintRegister(
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Constraint, extractRegisterName(Exprs[i], Target));
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if (InOutReg != "")
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InOutVars.insert(InOutReg);
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}
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// Check for each item in the clobber list if it conflicts with the input
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// or output
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for (int i = 0; i < NumClobbers; ++i) {
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StringRef Clobber = Clobbers[i]->getString();
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// We only check registers, therefore we don't check cc and memory
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// clobbers
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if (Clobber == "cc" || Clobber == "memory")
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continue;
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Clobber = Target.getNormalizedGCCRegisterName(Clobber, true);
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// Go over the output's registers we collected
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if (InOutVars.count(Clobber))
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return Clobbers[i]->getLocStart();
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}
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return SourceLocation();
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}
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StmtResult Sema::ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
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bool IsVolatile, unsigned NumOutputs,
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unsigned NumInputs, IdentifierInfo **Names,
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MultiExprArg constraints, MultiExprArg Exprs,
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Expr *asmString, MultiExprArg clobbers,
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SourceLocation RParenLoc) {
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unsigned NumClobbers = clobbers.size();
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StringLiteral **Constraints =
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reinterpret_cast<StringLiteral**>(constraints.data());
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StringLiteral *AsmString = cast<StringLiteral>(asmString);
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StringLiteral **Clobbers = reinterpret_cast<StringLiteral**>(clobbers.data());
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SmallVector<TargetInfo::ConstraintInfo, 4> OutputConstraintInfos;
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// The parser verifies that there is a string literal here.
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assert(AsmString->isAscii());
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// If we're compiling CUDA file and function attributes indicate that it's not
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// for this compilation side, skip all the checks.
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if (!DeclAttrsMatchCUDAMode(getLangOpts(), getCurFunctionDecl())) {
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GCCAsmStmt *NS = new (Context) GCCAsmStmt(
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Context, AsmLoc, IsSimple, IsVolatile, NumOutputs, NumInputs, Names,
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Constraints, Exprs.data(), AsmString, NumClobbers, Clobbers, RParenLoc);
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return NS;
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}
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for (unsigned i = 0; i != NumOutputs; i++) {
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StringLiteral *Literal = Constraints[i];
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assert(Literal->isAscii());
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StringRef OutputName;
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if (Names[i])
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OutputName = Names[i]->getName();
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TargetInfo::ConstraintInfo Info(Literal->getString(), OutputName);
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if (!Context.getTargetInfo().validateOutputConstraint(Info))
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return StmtError(Diag(Literal->getLocStart(),
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diag::err_asm_invalid_output_constraint)
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<< Info.getConstraintStr());
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ExprResult ER = CheckPlaceholderExpr(Exprs[i]);
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if (ER.isInvalid())
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return StmtError();
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Exprs[i] = ER.get();
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// Check that the output exprs are valid lvalues.
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Expr *OutputExpr = Exprs[i];
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// Referring to parameters is not allowed in naked functions.
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if (CheckNakedParmReference(OutputExpr, *this))
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return StmtError();
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// Check that the output expression is compatible with memory constraint.
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if (Info.allowsMemory() &&
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checkExprMemoryConstraintCompat(*this, OutputExpr, Info, false))
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return StmtError();
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OutputConstraintInfos.push_back(Info);
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// If this is dependent, just continue.
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if (OutputExpr->isTypeDependent())
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continue;
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Expr::isModifiableLvalueResult IsLV =
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OutputExpr->isModifiableLvalue(Context, /*Loc=*/nullptr);
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switch (IsLV) {
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case Expr::MLV_Valid:
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// Cool, this is an lvalue.
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break;
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case Expr::MLV_ArrayType:
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// This is OK too.
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break;
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case Expr::MLV_LValueCast: {
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const Expr *LVal = OutputExpr->IgnoreParenNoopCasts(Context);
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if (!getLangOpts().HeinousExtensions) {
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Diag(LVal->getLocStart(), diag::err_invalid_asm_cast_lvalue)
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<< OutputExpr->getSourceRange();
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} else {
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Diag(LVal->getLocStart(), diag::warn_invalid_asm_cast_lvalue)
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<< OutputExpr->getSourceRange();
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}
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// Accept, even if we emitted an error diagnostic.
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break;
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}
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case Expr::MLV_IncompleteType:
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case Expr::MLV_IncompleteVoidType:
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if (RequireCompleteType(OutputExpr->getLocStart(), Exprs[i]->getType(),
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diag::err_dereference_incomplete_type))
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return StmtError();
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LLVM_FALLTHROUGH;
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default:
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return StmtError(Diag(OutputExpr->getLocStart(),
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diag::err_asm_invalid_lvalue_in_output)
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<< OutputExpr->getSourceRange());
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}
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unsigned Size = Context.getTypeSize(OutputExpr->getType());
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if (!Context.getTargetInfo().validateOutputSize(Literal->getString(),
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Size))
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return StmtError(Diag(OutputExpr->getLocStart(),
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diag::err_asm_invalid_output_size)
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<< Info.getConstraintStr());
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}
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SmallVector<TargetInfo::ConstraintInfo, 4> InputConstraintInfos;
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for (unsigned i = NumOutputs, e = NumOutputs + NumInputs; i != e; i++) {
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StringLiteral *Literal = Constraints[i];
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assert(Literal->isAscii());
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StringRef InputName;
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if (Names[i])
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InputName = Names[i]->getName();
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TargetInfo::ConstraintInfo Info(Literal->getString(), InputName);
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if (!Context.getTargetInfo().validateInputConstraint(OutputConstraintInfos,
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Info)) {
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return StmtError(Diag(Literal->getLocStart(),
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diag::err_asm_invalid_input_constraint)
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<< Info.getConstraintStr());
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}
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ExprResult ER = CheckPlaceholderExpr(Exprs[i]);
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if (ER.isInvalid())
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return StmtError();
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Exprs[i] = ER.get();
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Expr *InputExpr = Exprs[i];
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// Referring to parameters is not allowed in naked functions.
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if (CheckNakedParmReference(InputExpr, *this))
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return StmtError();
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// Check that the input expression is compatible with memory constraint.
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if (Info.allowsMemory() &&
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checkExprMemoryConstraintCompat(*this, InputExpr, Info, true))
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return StmtError();
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// Only allow void types for memory constraints.
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if (Info.allowsMemory() && !Info.allowsRegister()) {
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if (CheckAsmLValue(InputExpr, *this))
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return StmtError(Diag(InputExpr->getLocStart(),
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diag::err_asm_invalid_lvalue_in_input)
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<< Info.getConstraintStr()
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<< InputExpr->getSourceRange());
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} else if (Info.requiresImmediateConstant() && !Info.allowsRegister()) {
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if (!InputExpr->isValueDependent()) {
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llvm::APSInt Result;
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if (!InputExpr->EvaluateAsInt(Result, Context))
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return StmtError(
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Diag(InputExpr->getLocStart(), diag::err_asm_immediate_expected)
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<< Info.getConstraintStr() << InputExpr->getSourceRange());
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if (!Info.isValidAsmImmediate(Result))
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return StmtError(Diag(InputExpr->getLocStart(),
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diag::err_invalid_asm_value_for_constraint)
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<< Result.toString(10) << Info.getConstraintStr()
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<< InputExpr->getSourceRange());
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}
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} else {
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ExprResult Result = DefaultFunctionArrayLvalueConversion(Exprs[i]);
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if (Result.isInvalid())
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return StmtError();
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Exprs[i] = Result.get();
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}
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if (Info.allowsRegister()) {
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if (InputExpr->getType()->isVoidType()) {
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return StmtError(Diag(InputExpr->getLocStart(),
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diag::err_asm_invalid_type_in_input)
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<< InputExpr->getType() << Info.getConstraintStr()
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<< InputExpr->getSourceRange());
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}
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}
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InputConstraintInfos.push_back(Info);
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const Type *Ty = Exprs[i]->getType().getTypePtr();
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if (Ty->isDependentType())
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continue;
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if (!Ty->isVoidType() || !Info.allowsMemory())
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if (RequireCompleteType(InputExpr->getLocStart(), Exprs[i]->getType(),
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diag::err_dereference_incomplete_type))
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return StmtError();
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unsigned Size = Context.getTypeSize(Ty);
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if (!Context.getTargetInfo().validateInputSize(Literal->getString(),
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Size))
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return StmtError(Diag(InputExpr->getLocStart(),
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diag::err_asm_invalid_input_size)
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<< Info.getConstraintStr());
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}
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// Check that the clobbers are valid.
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for (unsigned i = 0; i != NumClobbers; i++) {
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StringLiteral *Literal = Clobbers[i];
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assert(Literal->isAscii());
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StringRef Clobber = Literal->getString();
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if (!Context.getTargetInfo().isValidClobber(Clobber))
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return StmtError(Diag(Literal->getLocStart(),
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diag::err_asm_unknown_register_name) << Clobber);
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}
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GCCAsmStmt *NS =
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new (Context) GCCAsmStmt(Context, AsmLoc, IsSimple, IsVolatile, NumOutputs,
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NumInputs, Names, Constraints, Exprs.data(),
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AsmString, NumClobbers, Clobbers, RParenLoc);
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// Validate the asm string, ensuring it makes sense given the operands we
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// have.
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SmallVector<GCCAsmStmt::AsmStringPiece, 8> Pieces;
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unsigned DiagOffs;
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if (unsigned DiagID = NS->AnalyzeAsmString(Pieces, Context, DiagOffs)) {
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Diag(getLocationOfStringLiteralByte(AsmString, DiagOffs), DiagID)
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<< AsmString->getSourceRange();
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return StmtError();
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}
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// Validate constraints and modifiers.
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for (unsigned i = 0, e = Pieces.size(); i != e; ++i) {
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GCCAsmStmt::AsmStringPiece &Piece = Pieces[i];
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if (!Piece.isOperand()) continue;
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// Look for the correct constraint index.
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unsigned ConstraintIdx = Piece.getOperandNo();
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unsigned NumOperands = NS->getNumOutputs() + NS->getNumInputs();
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// Look for the (ConstraintIdx - NumOperands + 1)th constraint with
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// modifier '+'.
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if (ConstraintIdx >= NumOperands) {
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unsigned I = 0, E = NS->getNumOutputs();
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for (unsigned Cnt = ConstraintIdx - NumOperands; I != E; ++I)
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if (OutputConstraintInfos[I].isReadWrite() && Cnt-- == 0) {
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ConstraintIdx = I;
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break;
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}
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assert(I != E && "Invalid operand number should have been caught in "
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" AnalyzeAsmString");
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}
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// Now that we have the right indexes go ahead and check.
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StringLiteral *Literal = Constraints[ConstraintIdx];
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const Type *Ty = Exprs[ConstraintIdx]->getType().getTypePtr();
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if (Ty->isDependentType() || Ty->isIncompleteType())
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continue;
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unsigned Size = Context.getTypeSize(Ty);
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std::string SuggestedModifier;
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if (!Context.getTargetInfo().validateConstraintModifier(
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Literal->getString(), Piece.getModifier(), Size,
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SuggestedModifier)) {
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Diag(Exprs[ConstraintIdx]->getLocStart(),
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diag::warn_asm_mismatched_size_modifier);
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if (!SuggestedModifier.empty()) {
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auto B = Diag(Piece.getRange().getBegin(),
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diag::note_asm_missing_constraint_modifier)
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<< SuggestedModifier;
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SuggestedModifier = "%" + SuggestedModifier + Piece.getString();
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B.AddFixItHint(FixItHint::CreateReplacement(Piece.getRange(),
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SuggestedModifier));
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}
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}
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}
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// Validate tied input operands for type mismatches.
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unsigned NumAlternatives = ~0U;
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for (unsigned i = 0, e = OutputConstraintInfos.size(); i != e; ++i) {
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TargetInfo::ConstraintInfo &Info = OutputConstraintInfos[i];
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StringRef ConstraintStr = Info.getConstraintStr();
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unsigned AltCount = ConstraintStr.count(',') + 1;
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if (NumAlternatives == ~0U)
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NumAlternatives = AltCount;
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else if (NumAlternatives != AltCount)
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return StmtError(Diag(NS->getOutputExpr(i)->getLocStart(),
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diag::err_asm_unexpected_constraint_alternatives)
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<< NumAlternatives << AltCount);
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}
|
|
SmallVector<size_t, 4> InputMatchedToOutput(OutputConstraintInfos.size(),
|
|
~0U);
|
|
for (unsigned i = 0, e = InputConstraintInfos.size(); i != e; ++i) {
|
|
TargetInfo::ConstraintInfo &Info = InputConstraintInfos[i];
|
|
StringRef ConstraintStr = Info.getConstraintStr();
|
|
unsigned AltCount = ConstraintStr.count(',') + 1;
|
|
if (NumAlternatives == ~0U)
|
|
NumAlternatives = AltCount;
|
|
else if (NumAlternatives != AltCount)
|
|
return StmtError(Diag(NS->getInputExpr(i)->getLocStart(),
|
|
diag::err_asm_unexpected_constraint_alternatives)
|
|
<< NumAlternatives << AltCount);
|
|
|
|
// If this is a tied constraint, verify that the output and input have
|
|
// either exactly the same type, or that they are int/ptr operands with the
|
|
// same size (int/long, int*/long, are ok etc).
|
|
if (!Info.hasTiedOperand()) continue;
|
|
|
|
unsigned TiedTo = Info.getTiedOperand();
|
|
unsigned InputOpNo = i+NumOutputs;
|
|
Expr *OutputExpr = Exprs[TiedTo];
|
|
Expr *InputExpr = Exprs[InputOpNo];
|
|
|
|
// Make sure no more than one input constraint matches each output.
|
|
assert(TiedTo < InputMatchedToOutput.size() && "TiedTo value out of range");
|
|
if (InputMatchedToOutput[TiedTo] != ~0U) {
|
|
Diag(NS->getInputExpr(i)->getLocStart(),
|
|
diag::err_asm_input_duplicate_match)
|
|
<< TiedTo;
|
|
Diag(NS->getInputExpr(InputMatchedToOutput[TiedTo])->getLocStart(),
|
|
diag::note_asm_input_duplicate_first)
|
|
<< TiedTo;
|
|
return StmtError();
|
|
}
|
|
InputMatchedToOutput[TiedTo] = i;
|
|
|
|
if (OutputExpr->isTypeDependent() || InputExpr->isTypeDependent())
|
|
continue;
|
|
|
|
QualType InTy = InputExpr->getType();
|
|
QualType OutTy = OutputExpr->getType();
|
|
if (Context.hasSameType(InTy, OutTy))
|
|
continue; // All types can be tied to themselves.
|
|
|
|
// Decide if the input and output are in the same domain (integer/ptr or
|
|
// floating point.
|
|
enum AsmDomain {
|
|
AD_Int, AD_FP, AD_Other
|
|
} InputDomain, OutputDomain;
|
|
|
|
if (InTy->isIntegerType() || InTy->isPointerType())
|
|
InputDomain = AD_Int;
|
|
else if (InTy->isRealFloatingType())
|
|
InputDomain = AD_FP;
|
|
else
|
|
InputDomain = AD_Other;
|
|
|
|
if (OutTy->isIntegerType() || OutTy->isPointerType())
|
|
OutputDomain = AD_Int;
|
|
else if (OutTy->isRealFloatingType())
|
|
OutputDomain = AD_FP;
|
|
else
|
|
OutputDomain = AD_Other;
|
|
|
|
// They are ok if they are the same size and in the same domain. This
|
|
// allows tying things like:
|
|
// void* to int*
|
|
// void* to int if they are the same size.
|
|
// double to long double if they are the same size.
|
|
//
|
|
uint64_t OutSize = Context.getTypeSize(OutTy);
|
|
uint64_t InSize = Context.getTypeSize(InTy);
|
|
if (OutSize == InSize && InputDomain == OutputDomain &&
|
|
InputDomain != AD_Other)
|
|
continue;
|
|
|
|
// If the smaller input/output operand is not mentioned in the asm string,
|
|
// then we can promote the smaller one to a larger input and the asm string
|
|
// won't notice.
|
|
bool SmallerValueMentioned = false;
|
|
|
|
// If this is a reference to the input and if the input was the smaller
|
|
// one, then we have to reject this asm.
|
|
if (isOperandMentioned(InputOpNo, Pieces)) {
|
|
// This is a use in the asm string of the smaller operand. Since we
|
|
// codegen this by promoting to a wider value, the asm will get printed
|
|
// "wrong".
|
|
SmallerValueMentioned |= InSize < OutSize;
|
|
}
|
|
if (isOperandMentioned(TiedTo, Pieces)) {
|
|
// If this is a reference to the output, and if the output is the larger
|
|
// value, then it's ok because we'll promote the input to the larger type.
|
|
SmallerValueMentioned |= OutSize < InSize;
|
|
}
|
|
|
|
// If the smaller value wasn't mentioned in the asm string, and if the
|
|
// output was a register, just extend the shorter one to the size of the
|
|
// larger one.
|
|
if (!SmallerValueMentioned && InputDomain != AD_Other &&
|
|
OutputConstraintInfos[TiedTo].allowsRegister())
|
|
continue;
|
|
|
|
// Either both of the operands were mentioned or the smaller one was
|
|
// mentioned. One more special case that we'll allow: if the tied input is
|
|
// integer, unmentioned, and is a constant, then we'll allow truncating it
|
|
// down to the size of the destination.
|
|
if (InputDomain == AD_Int && OutputDomain == AD_Int &&
|
|
!isOperandMentioned(InputOpNo, Pieces) &&
|
|
InputExpr->isEvaluatable(Context)) {
|
|
CastKind castKind =
|
|
(OutTy->isBooleanType() ? CK_IntegralToBoolean : CK_IntegralCast);
|
|
InputExpr = ImpCastExprToType(InputExpr, OutTy, castKind).get();
|
|
Exprs[InputOpNo] = InputExpr;
|
|
NS->setInputExpr(i, InputExpr);
|
|
continue;
|
|
}
|
|
|
|
Diag(InputExpr->getLocStart(),
|
|
diag::err_asm_tying_incompatible_types)
|
|
<< InTy << OutTy << OutputExpr->getSourceRange()
|
|
<< InputExpr->getSourceRange();
|
|
return StmtError();
|
|
}
|
|
|
|
// Check for conflicts between clobber list and input or output lists
|
|
SourceLocation ConstraintLoc =
|
|
getClobberConflictLocation(Exprs, Constraints, Clobbers, NumClobbers,
|
|
Context.getTargetInfo(), Context);
|
|
if (ConstraintLoc.isValid())
|
|
return Diag(ConstraintLoc, diag::error_inoutput_conflict_with_clobber);
|
|
|
|
return NS;
|
|
}
|
|
|
|
static void fillInlineAsmTypeInfo(const ASTContext &Context, QualType T,
|
|
llvm::InlineAsmIdentifierInfo &Info) {
|
|
// Compute the type size (and array length if applicable?).
|
|
Info.Type = Info.Size = Context.getTypeSizeInChars(T).getQuantity();
|
|
if (T->isArrayType()) {
|
|
const ArrayType *ATy = Context.getAsArrayType(T);
|
|
Info.Type = Context.getTypeSizeInChars(ATy->getElementType()).getQuantity();
|
|
Info.Length = Info.Size / Info.Type;
|
|
}
|
|
}
|
|
|
|
ExprResult Sema::LookupInlineAsmIdentifier(CXXScopeSpec &SS,
|
|
SourceLocation TemplateKWLoc,
|
|
UnqualifiedId &Id,
|
|
llvm::InlineAsmIdentifierInfo &Info,
|
|
bool IsUnevaluatedContext) {
|
|
Info.clear();
|
|
|
|
if (IsUnevaluatedContext)
|
|
PushExpressionEvaluationContext(
|
|
ExpressionEvaluationContext::UnevaluatedAbstract,
|
|
ReuseLambdaContextDecl);
|
|
|
|
ExprResult Result = ActOnIdExpression(getCurScope(), SS, TemplateKWLoc, Id,
|
|
/*trailing lparen*/ false,
|
|
/*is & operand*/ false,
|
|
/*CorrectionCandidateCallback=*/nullptr,
|
|
/*IsInlineAsmIdentifier=*/ true);
|
|
|
|
if (IsUnevaluatedContext)
|
|
PopExpressionEvaluationContext();
|
|
|
|
if (!Result.isUsable()) return Result;
|
|
|
|
Result = CheckPlaceholderExpr(Result.get());
|
|
if (!Result.isUsable()) return Result;
|
|
|
|
// Referring to parameters is not allowed in naked functions.
|
|
if (CheckNakedParmReference(Result.get(), *this))
|
|
return ExprError();
|
|
|
|
QualType T = Result.get()->getType();
|
|
|
|
if (T->isDependentType()) {
|
|
return Result;
|
|
}
|
|
|
|
// Any sort of function type is fine.
|
|
if (T->isFunctionType()) {
|
|
return Result;
|
|
}
|
|
|
|
// Otherwise, it needs to be a complete type.
|
|
if (RequireCompleteExprType(Result.get(), diag::err_asm_incomplete_type)) {
|
|
return ExprError();
|
|
}
|
|
|
|
fillInlineAsmTypeInfo(Context, T, Info);
|
|
|
|
// We can work with the expression as long as it's not an r-value.
|
|
if (!Result.get()->isRValue())
|
|
Info.IsVarDecl = true;
|
|
|
|
return Result;
|
|
}
|
|
|
|
bool Sema::LookupInlineAsmField(StringRef Base, StringRef Member,
|
|
unsigned &Offset, SourceLocation AsmLoc) {
|
|
Offset = 0;
|
|
SmallVector<StringRef, 2> Members;
|
|
Member.split(Members, ".");
|
|
|
|
NamedDecl *FoundDecl = nullptr;
|
|
|
|
// MS InlineAsm uses 'this' as a base
|
|
if (getLangOpts().CPlusPlus && Base.equals("this")) {
|
|
if (const Type *PT = getCurrentThisType().getTypePtrOrNull())
|
|
FoundDecl = PT->getPointeeType()->getAsTagDecl();
|
|
} else {
|
|
LookupResult BaseResult(*this, &Context.Idents.get(Base), SourceLocation(),
|
|
LookupOrdinaryName);
|
|
if (LookupName(BaseResult, getCurScope()) && BaseResult.isSingleResult())
|
|
FoundDecl = BaseResult.getFoundDecl();
|
|
}
|
|
|
|
if (!FoundDecl)
|
|
return true;
|
|
|
|
for (StringRef NextMember : Members) {
|
|
const RecordType *RT = nullptr;
|
|
if (VarDecl *VD = dyn_cast<VarDecl>(FoundDecl))
|
|
RT = VD->getType()->getAs<RecordType>();
|
|
else if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(FoundDecl)) {
|
|
MarkAnyDeclReferenced(TD->getLocation(), TD, /*OdrUse=*/false);
|
|
// MS InlineAsm often uses struct pointer aliases as a base
|
|
QualType QT = TD->getUnderlyingType();
|
|
if (const auto *PT = QT->getAs<PointerType>())
|
|
QT = PT->getPointeeType();
|
|
RT = QT->getAs<RecordType>();
|
|
} else if (TypeDecl *TD = dyn_cast<TypeDecl>(FoundDecl))
|
|
RT = TD->getTypeForDecl()->getAs<RecordType>();
|
|
else if (FieldDecl *TD = dyn_cast<FieldDecl>(FoundDecl))
|
|
RT = TD->getType()->getAs<RecordType>();
|
|
if (!RT)
|
|
return true;
|
|
|
|
if (RequireCompleteType(AsmLoc, QualType(RT, 0),
|
|
diag::err_asm_incomplete_type))
|
|
return true;
|
|
|
|
LookupResult FieldResult(*this, &Context.Idents.get(NextMember),
|
|
SourceLocation(), LookupMemberName);
|
|
|
|
if (!LookupQualifiedName(FieldResult, RT->getDecl()))
|
|
return true;
|
|
|
|
if (!FieldResult.isSingleResult())
|
|
return true;
|
|
FoundDecl = FieldResult.getFoundDecl();
|
|
|
|
// FIXME: Handle IndirectFieldDecl?
|
|
FieldDecl *FD = dyn_cast<FieldDecl>(FoundDecl);
|
|
if (!FD)
|
|
return true;
|
|
|
|
const ASTRecordLayout &RL = Context.getASTRecordLayout(RT->getDecl());
|
|
unsigned i = FD->getFieldIndex();
|
|
CharUnits Result = Context.toCharUnitsFromBits(RL.getFieldOffset(i));
|
|
Offset += (unsigned)Result.getQuantity();
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
ExprResult
|
|
Sema::LookupInlineAsmVarDeclField(Expr *E, StringRef Member,
|
|
llvm::InlineAsmIdentifierInfo &Info,
|
|
SourceLocation AsmLoc) {
|
|
Info.clear();
|
|
|
|
QualType T = E->getType();
|
|
if (T->isDependentType()) {
|
|
DeclarationNameInfo NameInfo;
|
|
NameInfo.setLoc(AsmLoc);
|
|
NameInfo.setName(&Context.Idents.get(Member));
|
|
return CXXDependentScopeMemberExpr::Create(
|
|
Context, E, T, /*IsArrow=*/false, AsmLoc, NestedNameSpecifierLoc(),
|
|
SourceLocation(),
|
|
/*FirstQualifierInScope=*/nullptr, NameInfo, /*TemplateArgs=*/nullptr);
|
|
}
|
|
|
|
const RecordType *RT = T->getAs<RecordType>();
|
|
// FIXME: Diagnose this as field access into a scalar type.
|
|
if (!RT)
|
|
return ExprResult();
|
|
|
|
LookupResult FieldResult(*this, &Context.Idents.get(Member), AsmLoc,
|
|
LookupMemberName);
|
|
|
|
if (!LookupQualifiedName(FieldResult, RT->getDecl()))
|
|
return ExprResult();
|
|
|
|
// Only normal and indirect field results will work.
|
|
ValueDecl *FD = dyn_cast<FieldDecl>(FieldResult.getFoundDecl());
|
|
if (!FD)
|
|
FD = dyn_cast<IndirectFieldDecl>(FieldResult.getFoundDecl());
|
|
if (!FD)
|
|
return ExprResult();
|
|
|
|
// Make an Expr to thread through OpDecl.
|
|
ExprResult Result = BuildMemberReferenceExpr(
|
|
E, E->getType(), AsmLoc, /*IsArrow=*/false, CXXScopeSpec(),
|
|
SourceLocation(), nullptr, FieldResult, nullptr, nullptr);
|
|
if (Result.isInvalid())
|
|
return Result;
|
|
Info.OpDecl = Result.get();
|
|
|
|
fillInlineAsmTypeInfo(Context, Result.get()->getType(), Info);
|
|
|
|
// Fields are "variables" as far as inline assembly is concerned.
|
|
Info.IsVarDecl = true;
|
|
|
|
return Result;
|
|
}
|
|
|
|
StmtResult Sema::ActOnMSAsmStmt(SourceLocation AsmLoc, SourceLocation LBraceLoc,
|
|
ArrayRef<Token> AsmToks,
|
|
StringRef AsmString,
|
|
unsigned NumOutputs, unsigned NumInputs,
|
|
ArrayRef<StringRef> Constraints,
|
|
ArrayRef<StringRef> Clobbers,
|
|
ArrayRef<Expr*> Exprs,
|
|
SourceLocation EndLoc) {
|
|
bool IsSimple = (NumOutputs != 0 || NumInputs != 0);
|
|
getCurFunction()->setHasBranchProtectedScope();
|
|
MSAsmStmt *NS =
|
|
new (Context) MSAsmStmt(Context, AsmLoc, LBraceLoc, IsSimple,
|
|
/*IsVolatile*/ true, AsmToks, NumOutputs, NumInputs,
|
|
Constraints, Exprs, AsmString,
|
|
Clobbers, EndLoc);
|
|
return NS;
|
|
}
|
|
|
|
LabelDecl *Sema::GetOrCreateMSAsmLabel(StringRef ExternalLabelName,
|
|
SourceLocation Location,
|
|
bool AlwaysCreate) {
|
|
LabelDecl* Label = LookupOrCreateLabel(PP.getIdentifierInfo(ExternalLabelName),
|
|
Location);
|
|
|
|
if (Label->isMSAsmLabel()) {
|
|
// If we have previously created this label implicitly, mark it as used.
|
|
Label->markUsed(Context);
|
|
} else {
|
|
// Otherwise, insert it, but only resolve it if we have seen the label itself.
|
|
std::string InternalName;
|
|
llvm::raw_string_ostream OS(InternalName);
|
|
// Create an internal name for the label. The name should not be a valid
|
|
// mangled name, and should be unique. We use a dot to make the name an
|
|
// invalid mangled name. We use LLVM's inline asm ${:uid} escape so that a
|
|
// unique label is generated each time this blob is emitted, even after
|
|
// inlining or LTO.
|
|
OS << "__MSASMLABEL_.${:uid}__";
|
|
for (char C : ExternalLabelName) {
|
|
OS << C;
|
|
// We escape '$' in asm strings by replacing it with "$$"
|
|
if (C == '$')
|
|
OS << '$';
|
|
}
|
|
Label->setMSAsmLabel(OS.str());
|
|
}
|
|
if (AlwaysCreate) {
|
|
// The label might have been created implicitly from a previously encountered
|
|
// goto statement. So, for both newly created and looked up labels, we mark
|
|
// them as resolved.
|
|
Label->setMSAsmLabelResolved();
|
|
}
|
|
// Adjust their location for being able to generate accurate diagnostics.
|
|
Label->setLocation(Location);
|
|
|
|
return Label;
|
|
}
|