clang  3.9.0
Enumerations | Functions
CGCleanup.cpp File Reference
#include "CGCleanup.h"
#include "CodeGenFunction.h"
#include "llvm/Support/SaveAndRestore.h"
Include dependency graph for CGCleanup.cpp:

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. More...
 
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. More...
 
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. More...
 
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. More...
 
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. More...
 

Enumeration Type Documentation

Enumerator
ForActivation 
ForDeactivation 

Definition at line 1113 of file CGCleanup.cpp.

Function Documentation

static llvm::LoadInst* createLoadInstBefore ( Address  addr,
const Twine &  name,
llvm::Instruction *  beforeInst 
)
static
static llvm::BasicBlock* CreateNormalEntry ( CodeGenFunction CGF,
EHCleanupScope &  Scope 
)
static
static void createStoreInstBefore ( llvm::Value value,
Address  addr,
llvm::Instruction *  beforeInst 
)
static
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 563 of file CGCleanup.cpp.

References clang::Create(), clang::CodeGen::CodeGenFunction::getUnreachableBlock(), and clang::CodeGen::CodeGenFunction::NormalCleanupDest.

Referenced by clang::CodeGen::CodeGenFunction::PopCleanupBlock().

static void EmitCleanup ( CodeGenFunction CGF,
EHScopeStack::Cleanup Fn,
EHScopeStack::Cleanup::Flags  flags,
Address  ActiveFlag 
)
static
static void ForwardPrebranchedFallthrough ( llvm::BasicBlock *  Exit,
llvm::BasicBlock *  From,
llvm::BasicBlock *  To 
)
static

Definition at line 539 of file CGCleanup.cpp.

References E, and I.

Referenced by clang::CodeGen::CodeGenFunction::PopCleanupBlock().

static bool IsUsedAsEHCleanup ( EHScopeStack EHStack,
EHScopeStack::stable_iterator  cleanup 
)
static
static bool IsUsedAsNormalCleanup ( EHScopeStack EHStack,
EHScopeStack::stable_iterator  C 
)
static
static void ResolveAllBranchFixups ( CodeGenFunction CGF,
llvm::SwitchInst *  Switch,
llvm::BasicBlock *  CleanupEntry 
)
static
static void SetupCleanupBlockActivation ( CodeGenFunction CGF,
EHScopeStack::stable_iterator  C,
ForActivation_t  kind,
llvm::Instruction *  dominatingIP 
)
static
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 480 of file CGCleanup.cpp.

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

Referenced by clang::CodeGen::CodeGenFunction::PopCleanupBlock().

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 362 of file CGCleanup.cpp.

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

Referenced by clang::CodeGen::CodeGenFunction::ResolveBranchFixups().