#include "CGDebugInfo.h"
#include "CGOpenMPRuntime.h"
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "CodeGenPGO.h"
#include "TargetInfo.h"
#include "clang/AST/Attr.h"
#include "clang/AST/Expr.h"
#include "clang/AST/Stmt.h"
#include "clang/AST/StmtSYCL.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"

Classes
class	clang::AsmConstraintsInfo
	This structure holds the information gathered about the constraints for an inline assembly statement. More...

Namespaces
namespace	clang
	The JSON file list parser is used to communicate input to InstallAPI.

Macros
#define	STMT(Type, Base)
#define	ABSTRACT_STMT(Op)
#define	EXPR(Type, Base)

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

Macro Definition Documentation

◆ ABSTRACT_STMT

#define ABSTRACT_STMT ( Op )

◆ EXPR

#define EXPR	(		Type,
			Base )

Value:

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 2061 of file CGStmt.cpp.

Function Documentation

◆ CollectStatementsForCase()

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

static

Definition at line 2062 of file CGStmt.cpp.

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

Referenced by CollectStatementsForCase(), and FindCaseStatementsForValue().

◆ FindCaseStatementsForValue()

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 2217 of file CGStmt.cpp.

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