/*  */
#include "picoc.h"
#include "interpreter.h"


/* endian-ness checking */
static const int __ENDIAN_CHECK__ = 1;
static int BigEndian;
static int LittleEndian;


/* global initialisation for libraries */
void LibraryInit(Picoc *pc)
{

    /* define the version number macro */
    pc->VersionString = TableStrRegister(pc, PICOC_VERSION);
    VariableDefinePlatformVar(pc, NULL, "PICOC_VERSION", pc->CharPtrType,
        (union AnyValue*)&pc->VersionString, false);

    /* define endian-ness macros */
    BigEndian = ((*(char*)&__ENDIAN_CHECK__) == 0);
    LittleEndian = ((*(char*)&__ENDIAN_CHECK__) == 1);

    VariableDefinePlatformVar(pc, NULL, "BIG_ENDIAN", &pc->IntType,
        (union AnyValue*)&BigEndian, false);
    VariableDefinePlatformVar(pc, NULL, "LITTLE_ENDIAN", &pc->IntType,
        (union AnyValue*)&LittleEndian, false);
}

/* add a library */
void LibraryAdd(Picoc *pc, struct LibraryFunction *FuncList)
{
    struct ParseState Parser;
    int Count;
    char *Identifier;
    struct ValueType *ReturnType;
    struct Value *NewValue;
    void *Tokens;
    char *IntrinsicName = TableStrRegister(pc, "c library");

    /* read all the library definitions */
    for (Count = 0; FuncList[Count].Prototype != NULL; Count++) {
        Tokens = LexAnalyse(pc,
            (const char*)IntrinsicName, FuncList[Count].Prototype,
            strlen((char*)FuncList[Count].Prototype), NULL);
        LexInitParser(&Parser, pc, FuncList[Count].Prototype, Tokens,
            IntrinsicName, true, false);
        TypeParse(&Parser, &ReturnType, &Identifier, NULL, NULL, NULL);
        NewValue = ParseFunctionDefinition(&Parser, ReturnType, Identifier);
        NewValue->Val->FuncDef.Intrinsic = FuncList[Count].Func;
        HeapFreeMem(pc, Tokens);
    }
}

/* print a type to a stream without using printf/sprintf */
void PrintType(struct ValueType *Typ, IOFILE *Stream)
{
    switch (Typ->Base) {
    case TypeVoid:
        PrintStr("void", Stream);
        break;
    case TypeInt:
        PrintStr("int", Stream);
        break;
    case TypeShort:
        PrintStr("short", Stream);
        break;
    case TypeChar:
        PrintStr("char", Stream);
        break;
    case TypeLong:
        PrintStr("long", Stream);
        break;
    case TypeUnsignedInt:
        PrintStr("unsigned int", Stream);
        break;
    case TypeUnsignedShort:
        PrintStr("unsigned short", Stream);
        break;
    case TypeUnsignedLong:
        PrintStr("unsigned long", Stream);
        break;
    case TypeUnsignedChar:
        PrintStr("unsigned char", Stream);
        break;
    case TypeFP:
        PrintStr("double", Stream);
        break;
    case TypeFunction:
        PrintStr("function", Stream);
        break;
    case TypeMacro:
        PrintStr("macro", Stream);
        break;
    case TypePointer:
        if (Typ->FromType)
            PrintType(Typ->FromType, Stream);
        PrintCh('*', Stream);
        break;
    case TypeArray:
        PrintType(Typ->FromType, Stream);
        PrintCh('[', Stream);
        if (Typ->ArraySize != 0)
            PrintSimpleInt(Typ->ArraySize, Stream);
        PrintCh(']', Stream);
        break;
    case TypeStruct:
        PrintStr("struct ", Stream);
        PrintStr(Typ->Identifier, Stream);
        break;
    case TypeUnion:
        PrintStr("union ", Stream);
        PrintStr(Typ->Identifier, Stream);
        break;
    case TypeEnum:
        PrintStr("enum ", Stream);
        PrintStr(Typ->Identifier, Stream);
        break;
    case TypeGotoLabel:
        PrintStr("goto label ", Stream);
        break;
    case Type_Type:
        PrintStr("type ", Stream);
        break;
    }
}