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view ir/irfunction.h @ 1047:6bb04dbee21f
Some calling convention work for x86-64:
- Implement x86-64 extern(C), hopefully correctly.
- Tried to be a bit smarter about extern(D) while I was there.
Interestingly, this code seems to be generating more efficient code than
gcc and llvm-gcc in some edge cases, like returning a `{ [7 x i8] }` loaded from
a stack slot from an extern(C) function. (gcc generates 7 1-byte loads, while
this code generates a 4-byte, a 2-byte and a 1-byte load)
I also added some changes to make sure structs being returned from functions or
passed in as parameters are stored in memory where the rest of the backend seems
to expect them to be. These should be removed when support for first-class
aggregates improves.
author | Frits van Bommel <fvbommel wxs.nl> |
---|---|
date | Fri, 06 Mar 2009 16:00:47 +0100 |
parents | 45af482e3832 |
children | dc608dc33081 |
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#ifndef LDC_IR_IRFUNCTION_H #define LDC_IR_IRFUNCTION_H #include "gen/llvm.h" #include "ir/ir.h" #include "ir/irlandingpad.h" #include <vector> #include <stack> #include <map> struct ABIRewrite; // represents a function type argument // both explicit and implicit as well as return values struct IrFuncTyArg : IrBase { /** This is the original D type as the frontend knows it * May NOT be rewritten!!! */ Type* type; /// This is the final LLVM Type used for the parameter/return value type const llvm::Type* ltype; /** These are the final LLVM attributes used for the function. * Must be valid for the LLVM Type and byref setting */ unsigned attrs; /** 'true' if the final LLVM argument is a LLVM reference type. * Must be true when the D Type is a value type, but the final * LLVM Type is a reference type! */ bool byref; /** Pointer to the ABIRewrite structure needed to rewrite LLVM ValueS * to match the final LLVM Type when passing arguments and getting * return values */ ABIRewrite* rewrite; /// Helper to check if the 'inreg' attribute is set bool isInReg() const { return (attrs & llvm::Attribute::InReg) != 0; } /// Helper to check if the 'sret' attribute is set bool isSRet() const { return (attrs & llvm::Attribute::StructRet) != 0; } /// Helper to check if the 'byval' attribute is set bool isByVal() const { return (attrs & llvm::Attribute::ByVal) != 0; } /** @param t D type of argument/return value as known by the frontend * @param byref Initial value for the 'byref' field. If true the initial * LLVM Type will be of DtoType(type->pointerTo()), instead * of just DtoType(type) */ IrFuncTyArg(Type* t, bool byref, unsigned a = 0); }; // represents a function type struct IrFuncTy : IrBase { // return value IrFuncTyArg* ret; // null if not applicable IrFuncTyArg* arg_sret; IrFuncTyArg* arg_this; IrFuncTyArg* arg_nest; IrFuncTyArg* arg_arguments; IrFuncTyArg* arg_argptr; // normal explicit arguments typedef LLSmallVector<IrFuncTyArg*, 4> ArgList; typedef ArgList::iterator ArgIter; ArgList args; // C varargs bool c_vararg; // range of normal parameters to reverse bool reverseParams; IrFuncTy() : ret(NULL), arg_sret(NULL), arg_this(NULL), arg_nest(NULL), arg_arguments(NULL), arg_argptr(NULL), c_vararg(false), reverseParams(false) {} llvm::Value* putRet(Type* dty, DValue* dval); llvm::Value* getRet(Type* dty, DValue* dval); llvm::Value* putParam(Type* dty, int idx, DValue* dval); llvm::Value* getParam(Type* dty, int idx, DValue* dval); void getParam(Type* dty, int idx, DValue* dval, llvm::Value* lval); }; // represents a function struct IrFunction : IrBase { llvm::Function* func; llvm::Instruction* allocapoint; FuncDeclaration* decl; TypeFunction* type; bool queued; bool defined; llvm::Value* retArg; // return in ptr arg llvm::Value* thisArg; // class/struct 'this' arg llvm::Value* nestArg; // nested function 'this' arg llvm::Value* nestedVar; // nested var alloca llvm::Value* _arguments; llvm::Value* _argptr; llvm::DISubprogram diSubprogram; // pushes a unique label scope of the given name void pushUniqueLabelScope(const char* name); // pops a label scope void popLabelScope(); // gets the string under which the label's BB // is stored in the labelToBB map. // essentially prefixes ident by the strings in labelScopes std::string getScopedLabelName(const char* ident); // label to basic block lookup typedef std::map<std::string, llvm::BasicBlock*> LabelToBBMap; LabelToBBMap labelToBB; // landing pads for try statements IRLandingPad landingPad; IrFunction(FuncDeclaration* fd); // annotations void setNeverInline(); void setAlwaysInline(); private: // prefix for labels and gotos // used for allowing labels to be emitted twice std::vector<std::string> labelScopes; // next unique id stack std::stack<int> nextUnique; }; #endif