CGCleanup.cpp File Reference

#include "CGCleanup.h"
#include "CodeGenFunction.h"
#include "llvm/Support/SaveAndRestore.h"

Go to the source code of this file.

Enumerations
enum	ForActivation_t { ForActivation , ForDeactivation }

Functions
static void	createStoreInstBefore (llvm::Value *value, Address addr, llvm::BasicBlock::iterator beforeInst, CodeGenFunction &CGF)
static llvm::LoadInst *	createLoadInstBefore (Address addr, const Twine &name, llvm::BasicBlock::iterator beforeInst, CodeGenFunction &CGF)
static llvm::LoadInst *	createLoadInstBefore (Address addr, const Twine &name, CodeGenFunction &CGF)
static void	ResolveAllBranchFixups (CodeGenFunction &CGF, llvm::SwitchInst *Switch, llvm::BasicBlock *CleanupEntry)
	All the branch fixups on the EH stack have propagated out past the outermost normal cleanup; resolve them all by adding cases to the given switch instruction.
static llvm::SwitchInst *	TransitionToCleanupSwitch (CodeGenFunction &CGF, llvm::BasicBlock *Block)
	Transitions the terminator of the given exit-block of a cleanup to be a cleanup switch.
static llvm::BasicBlock *	CreateNormalEntry (CodeGenFunction &CGF, EHCleanupScope &Scope)
static llvm::BasicBlock *	SimplifyCleanupEntry (CodeGenFunction &CGF, llvm::BasicBlock *Entry)
	Attempts to reduce a cleanup's entry block to a fallthrough.
static void	EmitCleanup (CodeGenFunction &CGF, EHScopeStack::Cleanup *Fn, EHScopeStack::Cleanup::Flags flags, Address ActiveFlag)
static void	ForwardPrebranchedFallthrough (llvm::BasicBlock *Exit, llvm::BasicBlock *From, llvm::BasicBlock *To)
static void	destroyOptimisticNormalEntry (CodeGenFunction &CGF, EHCleanupScope &scope)
	We don't need a normal entry block for the given cleanup.
static bool	IsUsedAsEHCleanup (EHScopeStack &EHStack, EHScopeStack::stable_iterator cleanup)
static void	SetupCleanupBlockActivation (CodeGenFunction &CGF, EHScopeStack::stable_iterator C, ForActivation_t kind, llvm::Instruction *dominatingIP)
	The given cleanup block is changing activation state.
static void	EmitSehScope (CodeGenFunction &CGF, llvm::FunctionCallee &SehCppScope)

Enumeration Type Documentation

ForActivation_t

enum ForActivation_t

Enumerator
ForActivation
ForDeactivation

Definition at line 1203 of file CGCleanup.cpp.

Function Documentation

createLoadInstBefore() [1/2]

static llvm::LoadInst * createLoadInstBefore ( Address  addr, const Twine &  name, CodeGenFunction &  CGF  )

static

Definition at line 311 of file CGCleanup.cpp.

References clang::CodeGen::Address::emitRawPointer(), clang::CodeGen::Address::getAlignment(), clang::CharUnits::getAsAlign(), and clang::CodeGen::Address::getElementType().

createLoadInstBefore() [2/2]

static llvm::LoadInst * createLoadInstBefore ( Address  addr, const Twine &  name, llvm::BasicBlock::iterator  beforeInst, CodeGenFunction &  CGF  )

static

Definition at line 303 of file CGCleanup.cpp.

References clang::CodeGen::Address::emitRawPointer(), clang::CodeGen::Address::getAlignment(), clang::CharUnits::getAsAlign(), and clang::CodeGen::Address::getElementType().

Referenced by TransitionToCleanupSwitch().

CreateNormalEntry()

static llvm::BasicBlock * CreateNormalEntry ( CodeGenFunction &  CGF, EHCleanupScope &  Scope  )

static

Definition at line 505 of file CGCleanup.cpp.

References clang::CodeGen::CodeGenFunction::createBasicBlock().

createStoreInstBefore()

static void createStoreInstBefore ( llvm::Value *  value, Address  addr, llvm::BasicBlock::iterator  beforeInst, CodeGenFunction &  CGF  )

static

Definition at line 295 of file CGCleanup.cpp.

References clang::CodeGen::Address::emitRawPointer(), clang::CodeGen::Address::getAlignment(), and clang::CharUnits::getAsAlign().

Referenced by ResolveAllBranchFixups(), and SetupCleanupBlockActivation().

destroyOptimisticNormalEntry()

static void destroyOptimisticNormalEntry ( CodeGenFunction &  CGF, EHCleanupScope &  scope  )

static

We don't need a normal entry block for the given cleanup.

Optimistic fixup branches can cause these blocks to come into existence anyway; if so, destroy it.

The validity of this transformation is very much specific to the exact ways in which we form branches to cleanup entries.

Definition at line 604 of file CGCleanup.cpp.

References clang::CodeGen::EHCleanupScope::getNormalBlock(), clang::CodeGen::RawAddress::getPointer(), clang::CodeGen::CodeGenFunction::getUnreachableBlock(), and clang::CodeGen::CodeGenFunction::NormalCleanupDest.

EmitCleanup()

static void EmitCleanup ( CodeGenFunction &  CGF, EHScopeStack::Cleanup *  Fn, EHScopeStack::Cleanup::Flags  flags, Address  ActiveFlag  )

static

Definition at line 555 of file CGCleanup.cpp.

References clang::CodeGen::CodeGenFunction::Builder, clang::CodeGen::CodeGenFunction::createBasicBlock(), clang::CodeGen::CGBuilderTy::CreateLoad(), clang::CodeGen::CodeGenFunction::EmitBlock(), clang::CodeGen::CodeGenFunction::HaveInsertPoint(), and clang::CodeGen::Address::isValid().

EmitSehScope()

static void EmitSehScope ( CodeGenFunction &  CGF, llvm::FunctionCallee &  SehCppScope  )

static

Definition at line 1323 of file CGCleanup.cpp.

References clang::CodeGen::CodeGenFunction::Builder, clang::CodeGen::CodeGenFunction::createBasicBlock(), clang::CodeGen::CodeGenFunction::CurrentFuncletPad, clang::CodeGen::CodeGenFunction::EmitBlock(), clang::CodeGen::CodeGenFunction::getBundlesForFunclet(), and clang::CodeGen::CodeGenFunction::getInvokeDest().

ForwardPrebranchedFallthrough()

static void ForwardPrebranchedFallthrough ( llvm::BasicBlock *  Exit, llvm::BasicBlock *  From, llvm::BasicBlock *  To  )

static

Definition at line 580 of file CGCleanup.cpp.

References E, and clang::Switch.

IsUsedAsEHCleanup()

static bool IsUsedAsEHCleanup ( EHScopeStack &  EHStack, EHScopeStack::stable_iterator  cleanup  )

static

Definition at line 1182 of file CGCleanup.cpp.

References clang::CodeGen::EHScopeStack::find(), clang::CodeGen::EHScope::getEnclosingEHScope(), clang::CodeGen::EHScopeStack::getInnermostEHScope(), and clang::CodeGen::EHScope::hasEHBranches().

Referenced by SetupCleanupBlockActivation().

ResolveAllBranchFixups()

static void ResolveAllBranchFixups ( CodeGenFunction &  CGF, llvm::SwitchInst *  Switch, llvm::BasicBlock *  CleanupEntry  )

static

All the branch fixups on the EH stack have propagated out past the outermost normal cleanup; resolve them all by adding cases to the given switch instruction.

Definition at line 320 of file CGCleanup.cpp.

References clang::CodeGen::CodeGenFunction::Builder, clang::CodeGen::EHScopeStack::clearFixups(), createStoreInstBefore(), clang::CodeGen::BranchFixup::Destination, clang::CodeGen::BranchFixup::DestinationIndex, E, clang::CodeGen::CodeGenFunction::EHStack, clang::CodeGen::EHScopeStack::getBranchFixup(), clang::CodeGen::CodeGenFunction::getNormalCleanupDestSlot(), clang::CodeGen::EHScopeStack::getNumBranchFixups(), clang::CodeGen::BranchFixup::InitialBranch, clang::CodeGen::BranchFixup::OptimisticBranchBlock, and clang::Switch.

SetupCleanupBlockActivation()

static void SetupCleanupBlockActivation ( CodeGenFunction &  CGF, EHScopeStack::stable_iterator  C, ForActivation_t  kind, llvm::Instruction *  dominatingIP  )

static

The given cleanup block is changing activation state.

Configure a cleanup variable if necessary.

It would be good if we had some way of determining if there were extra uses after the change-over point.

Definition at line 1213 of file CGCleanup.cpp.

References clang::CodeGen::CodeGenFunction::Builder, clang::C, clang::CodeGen::CGBuilderTy::CreateStore(), createStoreInstBefore(), clang::CodeGen::CodeGenFunction::CreateTempAlloca(), clang::CodeGen::CodeGenFunction::EHStack, clang::CodeGen::EHScopeStack::find(), ForActivation, ForDeactivation, clang::CodeGen::CodeGenFunction::isInConditionalBranch(), IsUsedAsEHCleanup(), clang::CharUnits::One(), and clang::CodeGen::CodeGenFunction::setBeforeOutermostConditional().

SimplifyCleanupEntry()

static llvm::BasicBlock * SimplifyCleanupEntry ( CodeGenFunction &  CGF, llvm::BasicBlock *  Entry  )

static

Attempts to reduce a cleanup's entry block to a fallthrough.

This is basically llvm::MergeBlockIntoPredecessor, except simplified/optimized for the tighter constraints on cleanup blocks.

Returns the new block, whatever it is.

Definition at line 521 of file CGCleanup.cpp.

References clang::CodeGen::CodeGenFunction::Builder.

TransitionToCleanupSwitch()

static llvm::SwitchInst * TransitionToCleanupSwitch ( CodeGenFunction &  CGF, llvm::BasicBlock *  Block  )

static

Transitions the terminator of the given exit-block of a cleanup to be a cleanup switch.

Definition at line 358 of file CGCleanup.cpp.

References clang::Block, createLoadInstBefore(), clang::CodeGen::CodeGenFunction::getNormalCleanupDestSlot(), and clang::Switch.