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::Instruction *beforeInst)
static llvm::LoadInst *	createLoadInstBefore (Address addr, const Twine &name, llvm::Instruction *beforeInst)
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	IsUsedAsNormalCleanup (EHScopeStack &EHStack, EHScopeStack::stable_iterator C)
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 1214 of file CGCleanup.cpp.

Function Documentation

createLoadInstBefore()

static llvm::LoadInst * createLoadInstBefore ( Address  addr, const Twine &  name, llvm::Instruction *  beforeInst  )

static

Definition at line 330 of file CGCleanup.cpp.

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

Referenced by TransitionToCleanupSwitch().

CreateNormalEntry()

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

static

Definition at line 525 of file CGCleanup.cpp.

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

createStoreInstBefore()

static void createStoreInstBefore ( llvm::Value *  value, Address  addr, llvm::Instruction *  beforeInst  )

static

Definition at line 324 of file CGCleanup.cpp.

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

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 624 of file CGCleanup.cpp.

References clang::CodeGen::EHCleanupScope::getNormalBlock(), clang::CodeGen::Address::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 575 of file CGCleanup.cpp.

References clang::CodeGen::CodeGenFunction::Builder, clang::CodeGen::CodeGenFunction::createBasicBlock(), clang::CodeGen::CGBuilderTy::CreateLoad(), clang::CodeGen::EHScopeStack::Cleanup::Emit(), 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 1341 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 600 of file CGCleanup.cpp.

References clang::Switch.

IsUsedAsEHCleanup()

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

static

Definition at line 1193 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().

IsUsedAsNormalCleanup()

static bool IsUsedAsNormalCleanup ( EHScopeStack &  EHStack, EHScopeStack::stable_iterator  C  )

static

Definition at line 1174 of file CGCleanup.cpp.

References clang::C, clang::CodeGen::EHScopeStack::find(), and clang::CodeGen::EHScopeStack::getInnermostNormalCleanup().

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 340 of file CGCleanup.cpp.

References clang::CodeGen::CodeGenFunction::Builder, clang::CodeGen::EHScopeStack::clearFixups(), createStoreInstBefore(), clang::CodeGen::BranchFixup::Destination, clang::CodeGen::BranchFixup::DestinationIndex, 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 1224 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(), IsUsedAsNormalCleanup(), clang::CodeGen::Address::isValid(), 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 541 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 378 of file CGCleanup.cpp.

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