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view gen/irstate.h @ 1117:4c20fcc4252b
Fun with parameter attributes: For several of the "synthetic" parameters added
to D functions, we can apply noalias and nocapture. They are sret parameters,
'nest' pointers passed to nested functions, and _argptr:
Nocapture:
- Sret and nest are nocapture because they don't represent D-level variables,
and thus the callee can't (validly) obtain a pointer to them, let alone keep
it around after it returns.
- _argptr is nocapture because although the callee has access to it as a
pointer, that pointer is invalidated when it returns.
All three are noalias because they're function-local variables
- Sret and _argptr are noalias because they're freshly alloca'd memory only
used for a single function call that's not allowed to keep an aliasing
pointer to it around (since the parameter is nocapture).
- 'Nest' is noalias because the callee only ever has access to one such pointer
per parent function, and every parent function has a different one.
This commit also ensures attributes set on sret, _arguments and _argptr are
propagated to calls to such functions.
It also adds one exception to the general rule that attributes on function types
should propagate to calls: the type of a delegate's function pointer has a
'nest' parameter, but this can either be a true 'nest' (for delegates to nested
functions) or a 'this' (for delegates to member functions). Since 'this' is
neither noalias nor nocapture, and there's generally no way to tell which one it
is, we remove these attributes at the call site if the callee is a delegate.
author | Frits van Bommel <fvbommel wxs.nl> |
---|---|
date | Sat, 14 Mar 2009 22:15:31 +0100 |
parents | 8c73ff5f69e0 |
children | f99a3b393c03 |
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#ifndef LDC_GEN_IRSTATE_H #define LDC_GEN_IRSTATE_H #include <vector> #include <deque> #include <list> #include <sstream> #include "root.h" #include "aggregate.h" #include "ir/irfunction.h" #include "ir/irstruct.h" #include "ir/irvar.h" #include "llvm/Support/CallSite.h" namespace llvm { class TargetMachine; } // global ir state for current module struct IRState; struct TargetABI; extern IRState* gIR; extern llvm::TargetMachine* gTargetMachine; extern const llvm::TargetData* gTargetData; extern TargetABI* gABI; struct TypeFunction; struct TypeStruct; struct ClassDeclaration; struct FuncDeclaration; struct Module; struct TypeStruct; struct BaseClass; struct AnonDeclaration; struct EnclosingHandler; struct IrModule; // represents a scope struct IRScope { llvm::BasicBlock* begin; llvm::BasicBlock* end; IRBuilder<> builder; IRScope(); IRScope(llvm::BasicBlock* b, llvm::BasicBlock* e); }; // scope for loops struct IRLoopScope : IRScope { // generating statement Statement* s; // the try of a TryFinally that encloses the loop EnclosingHandler* enclosinghandler; // if it is a switch, we are a possible target for break // but not for continue bool isSwitch; IRLoopScope(); IRLoopScope(Statement* s, EnclosingHandler* enclosinghandler, llvm::BasicBlock* b, llvm::BasicBlock* e, bool isSwitch = false); }; struct IRBuilderHelper { IRState* state; IRBuilder<>* operator->(); }; struct IRAsmStmt { IRAsmStmt() : isBranchToLabel(NULL) {} std::string code; std::string out_c; std::string in_c; std::vector<LLValue*> out; std::vector<LLValue*> in; // if this is nonzero, it contains the target label Identifier* isBranchToLabel; }; struct IRAsmBlock { std::deque<IRAsmStmt*> s; std::set<std::string> clobs; size_t outputcount; // stores the labels within the asm block std::vector<Identifier*> internalLabels; AsmBlockStatement* asmBlock; const LLType* retty; unsigned retn; bool retemu; // emulate abi ret with a temporary LLValue* (*retfixup)(IRBuilderHelper b, LLValue* orig); // Modifies retval IRAsmBlock(AsmBlockStatement* b) : asmBlock(b), retty(NULL), retn(0), retemu(false), retfixup(NULL), outputcount(0) {} }; // represents the module struct IRState { IRState(llvm::Module* m); // module Module* dmodule; llvm::Module* module; // interface info type, used in DtoInterfaceInfoType const LLStructType* interfaceInfoType; const LLStructType* mutexType; const LLStructType* moduleRefType; // functions typedef std::vector<IrFunction*> FunctionVector; FunctionVector functions; IrFunction* func(); llvm::Function* topfunc(); TypeFunction* topfunctype(); llvm::Instruction* topallocapoint(); // structs typedef std::vector<IrStruct*> StructVector; StructVector structs; IrStruct* topstruct(); // D main function bool emitMain; llvm::Function* mainFunc; // basic block scopes std::vector<IRScope> scopes; IRScope& scope(); llvm::BasicBlock* scopebb(); llvm::BasicBlock* scopeend(); bool scopereturned(); // create a call or invoke, depending on the landing pad info // the template function is defined further down in this file template <typename InputIterator> llvm::CallSite CreateCallOrInvoke(LLValue* Callee, InputIterator ArgBegin, InputIterator ArgEnd, const char* Name=""); llvm::CallSite CreateCallOrInvoke(LLValue* Callee, const char* Name=""); llvm::CallSite CreateCallOrInvoke(LLValue* Callee, LLValue* Arg1, const char* Name=""); llvm::CallSite CreateCallOrInvoke2(LLValue* Callee, LLValue* Arg1, LLValue* Arg2, const char* Name=""); llvm::CallSite CreateCallOrInvoke3(LLValue* Callee, LLValue* Arg1, LLValue* Arg2, LLValue* Arg3, const char* Name=""); llvm::CallSite CreateCallOrInvoke4(LLValue* Callee, LLValue* Arg1, LLValue* Arg2, LLValue* Arg3, LLValue* Arg4, const char* Name=""); // loop blocks typedef std::vector<IRLoopScope> LoopScopeVec; LoopScopeVec loopbbs; // this holds the array being indexed or sliced so $ will work // might be a better way but it works. problem is I only get a // VarDeclaration for __dollar, but I can't see how to get the // array pointer from this :( std::vector<DValue*> arrays; // builder helper IRBuilderHelper ir; // debug info helper llvm::DIFactory difactory; typedef std::list<Dsymbol*> DsymbolList; // dsymbols that need to be resolved DsymbolList resolveList; // dsymbols that need to be declared DsymbolList declareList; // dsymbols that need constant initializers constructed DsymbolList constInitList; // dsymbols that need definitions DsymbolList defineList; // static ctors/dtors/unittests typedef std::vector<FuncDeclaration*> FuncDeclVector; FuncDeclVector ctors; FuncDeclVector dtors; FuncDeclVector unitTests; // for inline asm IRAsmBlock* asmBlock; std::ostringstream nakedAsm; // 'used' array solely for keeping a reference to globals std::vector<LLConstant*> usedArray; // dwarf dbg stuff LLGlobalVariable* dwarfCUs; LLGlobalVariable* dwarfSPs; LLGlobalVariable* dwarfGVs; }; template <typename InputIterator> llvm::CallSite IRState::CreateCallOrInvoke(LLValue* Callee, InputIterator ArgBegin, InputIterator ArgEnd, const char* Name) { llvm::BasicBlock* pad; if(pad = func()->landingPad.get()) { // intrinsics don't support invoking LLFunction* funcval = llvm::dyn_cast<LLFunction>(Callee); if (funcval && funcval->isIntrinsic()) { return ir->CreateCall(Callee, ArgBegin, ArgEnd, Name); } llvm::BasicBlock* postinvoke = llvm::BasicBlock::Create("postinvoke", topfunc(), scopeend()); llvm::InvokeInst* invoke = ir->CreateInvoke(Callee, postinvoke, pad, ArgBegin, ArgEnd, Name); scope() = IRScope(postinvoke, scopeend()); return invoke; } else return ir->CreateCall(Callee, ArgBegin, ArgEnd, Name); } #endif // LDC_GEN_IRSTATE_H