clang 8.0.0

Macros | Enumerations | Functions
CGStmt.cpp File Reference
`#include "CodeGenFunction.h"`
`#include "CGDebugInfo.h"`
`#include "CodeGenModule.h"`
`#include "TargetInfo.h"`
`#include "clang/AST/StmtVisitor.h"`
`#include "clang/Basic/Builtins.h"`
`#include "clang/Basic/PrettyStackTrace.h"`
`#include "clang/Basic/TargetInfo.h"`
`#include "llvm/ADT/StringExtras.h"`
`#include "llvm/IR/CallSite.h"`
`#include "llvm/IR/DataLayout.h"`
`#include "llvm/IR/InlineAsm.h"`
`#include "llvm/IR/Intrinsics.h"`
`#include "llvm/IR/MDBuilder.h"`
`#include "clang/AST/StmtNodes.inc"`
Include dependency graph for CGStmt.cpp:

Go to the source code of this file.

## 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
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. More...
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)
| 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. More...
static llvm::MDNode * | getAsmSrcLocInfo (const StringLiteral *Str, CodeGenFunction &CGF)
| getAsmSrcLocInfo - Return the !srcloc metadata node to attach to an inline asm call instruction. More...

## 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 1344 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
| ) |  |
| 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 1755 of file CGStmt.cpp.

References clang::TargetInfo::ConstraintInfo::allowsMemory(), clang::TargetInfo::ConstraintInfo::allowsRegister(), clang::CodeGen::CodeGenFunction::Builder, clang::CodeGen::CodeGenFunction::CGM, clang::CodeGen::CodeGenFunction::ConvertType(), clang::CodeGen::CGBuilderTy::CreateBitCast(), clang::CodeGen::CGBuilderTy::CreateLoad(), clang::CodeGen::CodeGenFunction::EmitLoadOfLValue(), clang::CodeGen::CodeGenFunction::EmitLValue(), clang::CodeGen::CodeGenFunction::EmitScalarExpr(), clang::CodeGen::CodeGenModule::ErrorUnsupported(), clang::Expr::EvaluateAsInt(), clang::Expr::EvaluateKnownConstInt(), clang::CodeGen::LValue::getAddress(), clang::Decl::getAttr(), clang::CodeGen::CodeGenFunction::getContext(), clang::CodeGen::CodeGenModule::getDataLayout(), clang::DeclRefExpr::getDecl(), clang::Expr::getExprLoc(), clang::APValue::getInt(), clang::CodeGen::CodeGenFunction::getLLVMContext(), clang::TargetInfo::getNormalizedGCCRegisterName(), clang::CodeGen::LValue::getPointer(), clang::CodeGen::RValue::getScalarVal(), clang::Stmt::getStmtClass(), clang::VarDecl::getStorageClass(), clang::Expr::getType(), clang::CodeGen::CodeGenFunction::hasScalarEvaluationKind(), clang::Expr::IgnoreParenNoopCasts(), clang::TargetInfo::isValidGCCRegisterName(), clang::TargetInfo::ConstraintInfo::requiresImmediateConstant(), clang::SC_Register, clang::CodeGen::Type, clang::Expr::EvalResult::Val, and clang::TargetInfo::validateOutputConstraint().

## ◆ CollectStatementsForCase()

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

Definition at line 1345 of file CGStmt.cpp.

## ◆ 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 1500 of file CGStmt.cpp.

## ◆ 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 1848 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::Int32Ty, and SM.

## ◆ SimplifyConstraint()

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

Definition at line 1702 of file CGStmt.cpp.

References clang::TargetInfo::convertConstraint().