CGStmt.cpp File Reference

#include "CGDebugInfo.h"
#include "CGOpenMPRuntime.h"
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "TargetInfo.h"
#include "clang/AST/Attr.h"
#include "clang/AST/Expr.h"
#include "clang/AST/Stmt.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/Basic/Builtins.h"
#include "clang/Basic/DiagnosticSema.h"
#include "clang/Basic/PrettyStackTrace.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/IR/Assumptions.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/MDBuilder.h"
#include "llvm/Support/SaveAndRestore.h"
#include <optional>
#include "clang/AST/StmtNodes.inc"

Go to the source code of this file.

Namespaces
namespace	llvm
	Diagnostic wrappers for TextAPI types for error reporting.

Macros
#define	STMT(Type, Base)
#define	ABSTRACT_STMT(Op)
#define	EXPR(Type, Base)    case Stmt::Type##Class:

Enumerations
enum	CSFC_Result { CSFC_Failure , CSFC_FallThrough , CSFC_Success }
	CollectStatementsForCase - Given the body of a 'switch' statement and a constant value that is being switched on, see if we can dead code eliminate the body of the switch to a simple series of statements to emit. More...

Functions
template<typename LoopStmt >
static bool	hasEmptyLoopBody (const LoopStmt &S)
static bool	isSwiftAsyncCallee (const CallExpr *CE)
	Determine if the given call uses the swiftasync calling convention.
static CSFC_Result	CollectStatementsForCase (const Stmt *S, const SwitchCase *Case, bool &FoundCase, SmallVectorImpl< const Stmt * > &ResultStmts)
static bool	FindCaseStatementsForValue (const SwitchStmt &S, const llvm::APSInt &ConstantCondValue, SmallVectorImpl< const Stmt * > &ResultStmts, ASTContext &C, const SwitchCase *&ResultCase)
	FindCaseStatementsForValue - Find the case statement being jumped to and then invoke CollectStatementsForCase to find the list of statements to emit for a switch on constant.
static std::optional< SmallVector< uint64_t, 16 > >	getLikelihoodWeights (ArrayRef< Stmt::Likelihood > Likelihoods)
static std::string	SimplifyConstraint (const char *Constraint, const TargetInfo &Target, SmallVectorImpl< TargetInfo::ConstraintInfo > *OutCons=nullptr)
static std::string	AddVariableConstraints (const std::string &Constraint, const Expr &AsmExpr, const TargetInfo &Target, CodeGenModule &CGM, const AsmStmt &Stmt, const bool EarlyClobber, std::string *GCCReg=nullptr)
	AddVariableConstraints - Look at AsmExpr and if it is a variable declared as using a particular register add that as a constraint that will be used in this asm stmt.
static llvm::MDNode *	getAsmSrcLocInfo (const StringLiteral *Str, CodeGenFunction &CGF)
	getAsmSrcLocInfo - Return the !srcloc metadata node to attach to an inline asm call instruction.
static void	UpdateAsmCallInst (llvm::CallBase &Result, bool HasSideEffect, bool HasUnwindClobber, bool ReadOnly, bool ReadNone, bool NoMerge, bool NoConvergent, const AsmStmt &S, const std::vector< llvm::Type * > &ResultRegTypes, const std::vector< llvm::Type * > &ArgElemTypes, CodeGenFunction &CGF, std::vector< llvm::Value * > &RegResults)
static void	EmitAsmStores (CodeGenFunction &CGF, const AsmStmt &S, const llvm::ArrayRef< llvm::Value * > RegResults, const llvm::ArrayRef< llvm::Type * > ResultRegTypes, const llvm::ArrayRef< llvm::Type * > ResultTruncRegTypes, const llvm::ArrayRef< LValue > ResultRegDests, const llvm::ArrayRef< QualType > ResultRegQualTys, const llvm::BitVector &ResultTypeRequiresCast, const llvm::BitVector &ResultRegIsFlagReg)
static void	EmitHipStdParUnsupportedAsm (CodeGenFunction *CGF, const AsmStmt &S)

Macro Definition Documentation

ABSTRACT_STMT

#define ABSTRACT_STMT

(

Op

)

EXPR

#define EXPR	(		Type,
			Base
	)		case Stmt::Type##Class:

STMT

#define STMT	(		Type,
			Base
	)

Enumeration Type Documentation

CSFC_Result

enum CSFC_Result

CollectStatementsForCase - Given the body of a 'switch' statement and a constant value that is being switched on, see if we can dead code eliminate the body of the switch to a simple series of statements to emit.

Basically, on a switch (5) we want to find these statements: case 5: printf(...); <– ++i; <– break;

and add them to the ResultStmts vector. If it is unsafe to do this transformation (for example, one of the elided statements contains a label that might be jumped to), return CSFC_Failure. If we handled it and 'S' should include statements after it (e.g. the printf() line is a substmt of the case) then return CSFC_FallThrough. If we handled it and found a break statement, then return CSFC_Success.

If Case is non-null, then we are looking for the specified case, checking that nothing we jump over contains labels. If Case is null, then we found the case and are looking for the break.

If the recursive walk actually finds our Case, then we set FoundCase to true.

Enumerator
CSFC_Failure
CSFC_FallThrough
CSFC_Success

Definition at line 1868 of file CGStmt.cpp.

Function Documentation

AddVariableConstraints()

static std::string AddVariableConstraints ( const std::string &  Constraint, const Expr &  AsmExpr, const TargetInfo &  Target, CodeGenModule &  CGM, const AsmStmt &  Stmt, const bool  EarlyClobber, std::string *  GCCReg = nullptr  )

static

AddVariableConstraints - Look at AsmExpr and if it is a variable declared as using a particular register add that as a constraint that will be used in this asm stmt.

Definition at line 2353 of file CGStmt.cpp.

References clang::TargetInfo::ConstraintInfo::allowsRegister(), clang::CodeGen::CodeGenFunction::CGM, clang::CodeGen::CodeGenModule::ErrorUnsupported(), clang::Decl::getAttr(), clang::DeclRefExpr::getDecl(), clang::VarDecl::getStorageClass(), clang::SC_Register, and Variable.

CollectStatementsForCase()

static CSFC_Result CollectStatementsForCase ( const Stmt *  S, const SwitchCase *  Case, bool &  FoundCase, SmallVectorImpl< const Stmt * > &  ResultStmts  )

static

Definition at line 1869 of file CGStmt.cpp.

References CollectStatementsForCase(), clang::CodeGen::CodeGenFunction::containsBreak(), clang::CodeGen::CodeGenFunction::ContainsLabel(), CSFC_Failure, CSFC_FallThrough, CSFC_Success, E, and clang::CodeGen::CodeGenFunction::mightAddDeclToScope().

Referenced by CollectStatementsForCase(), and FindCaseStatementsForValue().

EmitAsmStores()

static void EmitAsmStores ( CodeGenFunction &  CGF, const AsmStmt &  S, const llvm::ArrayRef< llvm::Value * >  RegResults, const llvm::ArrayRef< llvm::Type * >  ResultRegTypes, const llvm::ArrayRef< llvm::Type * >  ResultTruncRegTypes, const llvm::ArrayRef< LValue >  ResultRegDests, const llvm::ArrayRef< QualType >  ResultRegQualTys, const llvm::BitVector &  ResultTypeRequiresCast, const llvm::BitVector &  ResultRegIsFlagReg  )

static

Definition at line 2536 of file CGStmt.cpp.

References clang::CodeGen::CodeGenFunction::Builder, clang::CodeGen::CodeGenFunction::CGM, clang::CodeGen::CGBuilderTy::CreateStore(), clang::CodeGen::CodeGenFunction::EmitStoreThroughLValue(), clang::CodeGen::RValue::get(), clang::CodeGen::LValue::getAddress(), clang::CodeGen::CodeGenFunction::getContext(), clang::CodeGen::CodeGenModule::getDataLayout(), clang::CodeGen::CodeGenModule::getDiags(), clang::Expr::getExprLoc(), clang::CodeGen::CodeGenModule::getIntrinsic(), clang::ASTContext::getIntTypeForBitwidth(), clang::CodeGen::CodeGenFunction::getLLVMContext(), clang::CodeGen::CodeGenFunction::getTargetHooks(), clang::ASTContext::getTypeSize(), clang::QualType::isNull(), clang::CodeGen::TargetCodeGenInfo::isScalarizableAsmOperand(), clang::CodeGen::CodeGenFunction::MakeAddrLValue(), clang::DiagnosticsEngine::Report(), and clang::CodeGen::Address::withElementType().

EmitHipStdParUnsupportedAsm()

static void EmitHipStdParUnsupportedAsm ( CodeGenFunction *  CGF, const AsmStmt &  S  )

static

Definition at line 2621 of file CGStmt.cpp.

References clang::Asm, clang::CodeGen::CodeGenFunction::Builder, clang::CodeGen::CodeGenFunction::CGM, clang::CodeGen::CodeGenModule::getLLVMContext(), and clang::CodeGen::CodeGenModule::getModule().

FindCaseStatementsForValue()

static bool FindCaseStatementsForValue ( const SwitchStmt &  S, const llvm::APSInt &  ConstantCondValue, SmallVectorImpl< const Stmt * > &  ResultStmts, ASTContext &  C, const SwitchCase *&  ResultCase  )

static

FindCaseStatementsForValue - Find the case statement being jumped to and then invoke CollectStatementsForCase to find the list of statements to emit for a switch on constant.

See the comment above CollectStatementsForCase for more details.

Definition at line 2024 of file CGStmt.cpp.

References clang::C, CollectStatementsForCase(), clang::CodeGen::CodeGenFunction::ContainsLabel(), CSFC_Failure, clang::Expr::EvaluateKnownConstInt(), clang::CaseStmt::getLHS(), clang::SwitchCase::getNextSwitchCase(), and clang::CaseStmt::getRHS().

getAsmSrcLocInfo()

static llvm::MDNode * getAsmSrcLocInfo ( const StringLiteral *  Str, CodeGenFunction &  CGF  )

static

getAsmSrcLocInfo - Return the !srcloc metadata node to attach to an inline asm call instruction.

The !srcloc MDNode contains a list of constant integers which are the source locations of the start of each line in the asm.

Definition at line 2447 of file CGStmt.cpp.

References clang::CodeGen::CodeGenFunction::CGM, clang::StringLiteral::getBeginLoc(), clang::CodeGen::CodeGenModule::getContext(), clang::CodeGen::CodeGenModule::getLangOpts(), clang::CodeGen::CodeGenFunction::getLLVMContext(), clang::StringLiteral::getLocationOfByte(), clang::SourceLocation::getRawEncoding(), clang::ASTContext::getSourceManager(), clang::StringLiteral::getString(), clang::CodeGen::CodeGenFunction::getTarget(), clang::CodeGen::CodeGenTypeCache::Int64Ty, and SM.

Referenced by UpdateAsmCallInst().

getLikelihoodWeights()

static std::optional< SmallVector< uint64_t, 16 > > getLikelihoodWeights ( ArrayRef< Stmt::Likelihood >  Likelihoods )

static

Definition at line 2078 of file CGStmt.cpp.

References clang::Stmt::LH_Likely, clang::Stmt::LH_None, clang::Stmt::LH_Unlikely, clang::CodeGen::None, and clang::Result.

hasEmptyLoopBody()

template<typename LoopStmt >

static bool hasEmptyLoopBody ( const LoopStmt &  S )

static

Definition at line 979 of file CGStmt.cpp.

isSwiftAsyncCallee()

static bool isSwiftAsyncCallee ( const CallExpr *  CE )

static

Determine if the given call uses the swiftasync calling convention.

Definition at line 1449 of file CGStmt.cpp.

References clang::Type::castAs(), clang::CC_SwiftAsync, clang::FunctionType::getCallConv(), clang::CallExpr::getCallee(), clang::Type::getPointeeType(), and clang::Expr::getType().

SimplifyConstraint()

static std::string SimplifyConstraint ( const char *  Constraint, const TargetInfo &  Target, SmallVectorImpl< TargetInfo::ConstraintInfo > *  OutCons = nullptr  )

static

Definition at line 2300 of file CGStmt.cpp.

References clang::Result.

UpdateAsmCallInst()

static void UpdateAsmCallInst ( llvm::CallBase &  Result, bool  HasSideEffect, bool  HasUnwindClobber, bool  ReadOnly, bool  ReadNone, bool  NoMerge, bool  NoConvergent, const AsmStmt &  S, const std::vector< llvm::Type * > &  ResultRegTypes, const std::vector< llvm::Type * > &  ArgElemTypes, CodeGenFunction &  CGF, std::vector< llvm::Value * > &  RegResults  )

static

Definition at line 2474 of file CGStmt.cpp.

References clang::LangOptions::assumeFunctionsAreConvergent(), clang::CodeGen::CodeGenFunction::Builder, getAsmSrcLocInfo(), clang::CodeGen::CodeGenFunction::getLangOpts(), clang::CodeGen::CodeGenFunction::getLLVMContext(), clang::CodeGen::CodeGenTypeCache::Int64Ty, Loc, and clang::Result.