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view gen/abi.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 | 34f2fd925de3 |
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#ifndef __LDC_GEN_ABI_H__ #define __LDC_GEN_ABI_H__ #include <vector> struct Type; struct IrFuncTyArg; struct DValue; namespace llvm { class Type; class Value; } // return rewrite rule struct ABIRewrite { /// get a rewritten value back to its original form virtual LLValue* get(Type* dty, DValue* v) = 0; /// get a rewritten value back to its original form and store result in provided lvalue /// this one is optional and defaults to calling the one above virtual void getL(Type* dty, DValue* v, llvm::Value* lval); /// put out rewritten value virtual LLValue* put(Type* dty, DValue* v) = 0; /// should return the transformed type for this rewrite virtual const LLType* type(Type* dty, const LLType* t) = 0; }; // interface called by codegen struct TargetABI { static TargetABI* getTarget(); virtual void newFunctionType(TypeFunction* tf) {} virtual bool returnInArg(TypeFunction* tf) = 0; virtual bool passByVal(Type* t) = 0; virtual void doneWithFunctionType() {} virtual void rewriteFunctionType(TypeFunction* t) = 0; }; #endif