code.c 21 KB
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#include <stdio.h>
#include <stdlib.h>
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#include <stdbool.h>
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#include <strings.h>
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#include "debug.h"
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#include "code.h"
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#include "mem.h"
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#include "desc.h"
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#include "gc.h"
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// For compressing the source code a bit

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#define instackb(addr) ((char*)addr >= (char*) &stack_b[0] && (char*)addr < (char*) &stack_b[STACK_SIZE_B])

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#define follow_thunk(thunk) if (thunk->desc == (Desc*) __FORWARD_PTR__) thunk = thunk->_forward_ptr;

#define forward_thunk(thunk, frame_ptr) \
        Thunk* dst = get_dst(frame_ptr); \
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        if(dst != NULL){ \
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        dst->desc = (Desc*) __FORWARD_PTR__; \
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        dst->_forward_ptr = thunk; \
        }
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#define placeholder() \
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        push_a(alloc_b());
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#define arg_from_code(descarg, arg) \
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        if(((FunEntry*) (descarg))->boxing & argmask) \
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        { \
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            placeholder(); \
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            exec(arg, frame_ptr, stack_top_a); \
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        } \
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        else if(((FunEntry*) (descarg))->strictness & argmask) \
        { \
            push_a(NULL); \
            exec(arg, frame_ptr, stack_top_a); \
        } \
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        else \
        { \
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            push_a(arg->create_thunk(arg, frame_ptr)); \
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        } \
        argmask <<= 1;

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struct Thunk* create_thunk_app_static(Code* expr, int frame_ptr)
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{
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    Thunk* thunk = (Thunk*) alloc_heap(((AppEntry*) expr)->f->thunk_size);
    thunk->desc = ((AppEntry*) expr)->f;
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    assert(thunk->desc->arity == expr->nr_args);
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    for (int i = 0; i < expr->nr_args; i++) {
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        thunk->_args[i] = ((AppEntry*) expr)->args[i]->create_thunk(((AppEntry*) expr)->args[i], frame_ptr);
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    }
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    return thunk;                        
}
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struct Thunk* create_thunk_app_dyn(Code* expr, int frame_ptr)
{
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    push_a(local(frame_ptr, ((AppEntry*)expr)->var.index));
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    int tmp = gc_enabled;
    gc_enabled = 0;
    peek_a()->desc->eval();
    gc_enabled = tmp;
    
    Thunk* basethunk = pop_a();
    
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    Desc* slice =
            get_slice(basethunk->desc->type == FT_SLICE ?
                      ((SliceEntry*) basethunk->desc)->forward_ptr : basethunk->desc, basethunk->desc->arity + expr->nr_args);
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    Thunk* thunk = (Thunk*) alloc_heap(slice->thunk_size);
    thunk->desc = slice;
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    assert(thunk->desc->arity == basethunk->desc->arity + expr->nr_args);            

    memcpy(&thunk->_args, &basethunk->_args, sizeof(Thunk*) * basethunk->desc->arity);

    for (int i = 0; i < expr->nr_args; i++) {
        thunk->_args[basethunk->desc->arity + i] 
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                = ((AppEntry*) expr)->args[i]->create_thunk(((AppEntry*) expr)->args[i], frame_ptr);
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    }
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    return thunk;    
}

struct Thunk* create_thunk_var(Code* expr, int frame_ptr)
{
    return local(frame_ptr, ((VarEntry*) expr)->index);    
}

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struct Thunk* create_thunk_var_unboxed(Code* expr, int frame_ptr)
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{
    Thunk* arg = local(frame_ptr, ((VarEntry*) expr)->index);

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    if(instackb(arg))
    {
        // The likely case
        Thunk* target = (Thunk*) alloc_heap(sizeof (Thunk));
        memcpy(target, arg, sizeof(Thunk));
        return target;        
    }
    else
    {
        return arg;
    }
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}

struct Thunk* create_thunk_thunk(Code* expr, int frame_ptr)
{
    return &((ThunkEntry*) expr)->thunk;
}

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void set_create_thunk_fun(Code* code)
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{
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    switch(code->type)
    {
        case CT_APP_PRIM1:
        case CT_APP_PRIM2:
        case CT_APP_FUN:
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        case CT_APP_FUN1:
        case CT_APP_FUN2:
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        case CT_APP_THUNK:
            code->create_thunk = create_thunk_app_static;
            break;
        case CT_APP_DYN:
            code->create_thunk = create_thunk_app_dyn;
            break;
        case CT_VAR:
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        case CT_VAR_STRICT:            
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            code->create_thunk = create_thunk_var;
            break;
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        case CT_VAR_UNBOXED:
            code->create_thunk = create_thunk_var_unboxed;
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            break;
        case CT_THUNK:
            code->create_thunk = create_thunk_thunk;
            break;
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        case CT_SELECT_ADT:
        case CT_SELECT_LIT:    
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        case CT_IF:
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            code->create_thunk = NULL;
            break;            
    }
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}

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void exec(Code* expr, int frame_ptr, int root_frame_ptr)
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{
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    if(heap_curr > gc_trigger) gc();
    
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    int root_frame_ptr_b = stack_top_b;    
    
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    while(1)
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    {        
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        assert(expr != NULL);
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        assert(stack_top_a < STACK_SIZE_A);
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        assert(stack_top_b < STACK_SIZE_B);
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        // TODO: check over application
        // TODO: enforce strictness in ADT/Record
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        switch (expr->type) {
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        case CT_APP_PRIM1:
        {
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            switch(expr->arg_pattern)
            {
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            case 1:
                push_a(local(frame_ptr, ((VarEntry*) ((AppEntry*) expr)->args[0])->index));  
                break;
            case 2:
                push_a(&((ThunkEntry*) ((AppEntry*) expr)->args[0])->thunk);            
                break;
            default:
                placeholder();                        
                exec(((AppEntry*) expr)->args[0], frame_ptr, stack_top_a);
                break;
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            }
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            ((PrimEntry*) ((AppEntry*) expr)->f)->exec(root_frame_ptr);

            destroy_stack_frame(root_frame_ptr);
            destroy_stack_frame_b(root_frame_ptr_b);
            return;                        
        }
        case CT_APP_PRIM2:
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        {           
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            // careful, "exec" may trigger garbage collection
            // read local variables only after the last exec            
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            switch(expr->arg_pattern)
            {
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            case 1:
                push_a(local(frame_ptr, ((VarEntry*) ((AppEntry*) expr)->args[0])->index));  
                push_a(&((ThunkEntry*) ((AppEntry*) expr)->args[1])->thunk);
                break;
            case 2:
                push_a(&((ThunkEntry*) ((AppEntry*) expr)->args[0])->thunk);            
                push_a(local(frame_ptr, ((VarEntry*) ((AppEntry*) expr)->args[1])->index));                        
                break;
            case 3:
                push_a(local(frame_ptr, ((VarEntry*) ((AppEntry*) expr)->args[0])->index));
                push_a(local(frame_ptr, ((VarEntry*) ((AppEntry*) expr)->args[1])->index));
                break;                    
            case 4:
                push_a(&((ThunkEntry*) ((AppEntry*) expr)->args[0])->thunk);            
                placeholder();                       
                exec(((AppEntry*) expr)->args[1], frame_ptr, stack_top_a);                    
                break;                    
            case 5:
                placeholder();                     
                exec(((AppEntry*) expr)->args[0], frame_ptr, stack_top_a);
                push_a(&((ThunkEntry*) ((AppEntry*) expr)->args[1])->thunk);                                
                break;                    
            case 6:
                push_a(local(frame_ptr, ((VarEntry*) ((AppEntry*) expr)->args[0])->index));
                placeholder();                       
                exec(((AppEntry*) expr)->args[1], frame_ptr, stack_top_a);
                break;                    
            case 7:
                placeholder();                        
                exec(((AppEntry*) expr)->args[0], frame_ptr, stack_top_a);
                push_a(local(frame_ptr, ((VarEntry*) ((AppEntry*) expr)->args[1])->index));
                break;                    
            default:
                placeholder();                       
                exec(((AppEntry*) expr)->args[0], frame_ptr, stack_top_a);
                placeholder();                        
                exec(((AppEntry*) expr)->args[1], frame_ptr, stack_top_a);                    
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            }
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            ((PrimEntry*) ((AppEntry*) expr)->f)->exec(root_frame_ptr);
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            destroy_stack_frame(root_frame_ptr);
            destroy_stack_frame_b(root_frame_ptr_b);
            return;            
        }
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        case CT_APP_FUN1:
        {
            Desc* slice = ((AppEntry*) expr)->f;

            int argmask = 1;            
            arg_from_code(slice, ((AppEntry*) expr)->args[0]);
              
            expr = ((FunEntry*) slice)->body;
            frame_ptr = stack_top_a - 1;
            continue;                        
        }        
        case CT_APP_FUN2:
        {
            Desc* slice = ((AppEntry*) expr)->f;
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            int argmask = 1;
            
            arg_from_code(slice, ((AppEntry*) expr)->args[0]);
            arg_from_code(slice, ((AppEntry*) expr)->args[1]);
              
            expr = ((FunEntry*) slice)->body;
            frame_ptr = stack_top_a - 2;
            continue;                        
        }
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        case CT_APP_FUN:
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        {            
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            Desc* slice = ((AppEntry*) expr)->f;
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            int new_frame_ptr = stack_top_a;
            int argmask = 1;
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            for (int i = 0; i < expr->nr_args; i++) {
                arg_from_code(slice, ((AppEntry*) expr)->args[i]);
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            }
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            expr = ((FunEntry*) slice)->body;
            frame_ptr = new_frame_ptr;
            continue;            
        }
        case CT_APP_THUNK:
        {
            Desc* slice = ((AppEntry*) expr)->f;
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            Thunk* thunk = get_dst(root_frame_ptr);
            int newsize = slice->thunk_size;
            
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            if (thunk == NULL)
            {
                thunk = (Thunk*) alloc_heap(newsize);
                set_return(root_frame_ptr, thunk);
            }
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            else if (thunk->desc->thunk_size < newsize) {
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                Thunk* target = thunk;
                thunk = (Thunk*) alloc_heap(newsize);
                target->desc = (Desc*) __FORWARD_PTR__;
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                target->_forward_ptr = thunk;
                set_return(root_frame_ptr, thunk);
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            }
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            thunk->desc = slice;
            
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            assert(thunk->desc->arity == expr->nr_args);
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            for (int i = 0; i < expr->nr_args; i++) {
                thunk->_args[i]  
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                        = ((AppEntry*) expr)->args[i]->create_thunk(((AppEntry*) expr)->args[i], frame_ptr);
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            }
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            destroy_stack_frame(root_frame_ptr);
            destroy_stack_frame_b(root_frame_ptr_b);
            return;                                
        }
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        case CT_APP_DYN:
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        {
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            push_a(local(frame_ptr, ((AppEntry*)expr)->var.index));

            Thunk** bt = &peek_a();
            (*bt)->desc->eval();
            
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            Desc* slice =
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                    get_slice((*bt)->desc->type == FT_SLICE ?
                              ((SliceEntry*) (*bt)->desc)->forward_ptr : (*bt)->desc, (*bt)->desc->arity + expr->nr_args);
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            switch(slice->type) {
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            case FT_PRIM1:
            case FT_PRIM2:
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            {
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                for (int i = 0; i < (*bt)->desc->arity; i++) {
                    push_a((*bt)->_args[i]);
                    /*if(!basethunk->_args[i]->desc->hnf)*/ (*bt)->_args[i]->desc->eval();
                    
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                }
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                for (int i = 0; i < expr->nr_args; i++) {
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                    placeholder();
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                    exec(((AppEntry*) expr)->args[i], frame_ptr, stack_top_a);
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                } 

                ((PrimEntry*) slice)->exec(root_frame_ptr);
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                destroy_stack_frame(root_frame_ptr);
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                destroy_stack_frame_b(root_frame_ptr_b);                
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                return;                    
            }
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            case FT_FUN:
            {
                int new_frame_ptr = stack_top_a;                    
                int argmask = 1;

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                for (int i = 0; i < (*bt)->desc->arity; i++) {                    
                    push_a((*bt)->_args[i]);
                    if(((FunEntry*) (slice))->strictness & argmask /*&& !arg->desc->hnf*/) 
                    { 
                        (*bt)->_args[i]->desc->eval(); 
                    } 
                    argmask <<= 1;
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                }

                for (int i = 0; i < expr->nr_args; i++) {
                    arg_from_code(slice, ((AppEntry*) expr)->args[i]);    
                } 
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                expr = ((FunEntry*) slice)->body;
                frame_ptr = new_frame_ptr;
                continue;                    
            }
            case FT_SLICE:
            case FT_ADT:
            case FT_RECORD:
            {
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                Thunk* thunk = get_dst(root_frame_ptr);
                int newsize = slice->thunk_size;

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                if (thunk != NULL && thunk->desc->thunk_size < newsize) {
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                    Thunk* target = thunk;
                    thunk = (Thunk*) alloc_heap(newsize);
                    target->desc = (Desc*) __FORWARD_PTR__;
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                    target->_forward_ptr = thunk;
                    set_return(root_frame_ptr, thunk);
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                }
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                thunk->desc = slice;
                
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                assert(thunk->desc->arity == (*bt)->desc->arity + expr->nr_args);            
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                memcpy(&thunk->_args, &(*bt)->_args, sizeof(Thunk*) * (*bt)->desc->arity);
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                for (int i = 0; i < expr->nr_args; i++) {
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                    thunk->_args[(*bt)->desc->arity + i] 
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                            = ((AppEntry*) expr)->args[i]->create_thunk(((AppEntry*) expr)->args[i], frame_ptr);
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                }

                destroy_stack_frame(root_frame_ptr);
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                destroy_stack_frame_b(root_frame_ptr_b);
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                return;                    
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            }
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            case FT_BOXED_LIT:
                abort("Literal unexpected here");                
            case FT_CAF:
            case FT_CAF_REDUCED:
                not_implemented("CAF");
            }
        }
        case CT_VAR_STRICT:
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        case CT_VAR_UNBOXED:            
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        {
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            Thunk* arg = local(frame_ptr, ((VarEntry*) expr)->index);
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            assert(is_hnf(arg));
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            if(get_dst(root_frame_ptr) != NULL && arg->desc->thunk_size <= sizeof(Thunk))
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            {
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                memcpy(get_dst(root_frame_ptr), arg, sizeof(Thunk));
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            }
            else
            {
                forward_thunk(arg, root_frame_ptr);
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                set_return(root_frame_ptr, arg);
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            }
            
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            destroy_stack_frame(root_frame_ptr);
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            destroy_stack_frame_b(root_frame_ptr_b);            
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            return;                    
        }
        case CT_VAR:
        {
            Thunk* thunk = local(frame_ptr, ((VarEntry*) expr)->index);
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            assert(!instackb(thunk));
            
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            follow_thunk(thunk);
            forward_thunk(thunk, root_frame_ptr);            
            set_return(root_frame_ptr, thunk);
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            switch(thunk->desc->type) {
            case FT_FUN:
            {
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                // Destroy stack frame before eval, it is not needed any more
                // Greatly reduces stack usage
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                destroy_stack_frame(root_frame_ptr);
                destroy_stack_frame_b(root_frame_ptr_b);  
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                frame_ptr = stack_top_a;
                // Here frame_ptr == root_frame_ptr

                int argmask = 1;
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                for (int i = 0; i < thunk->desc->arity; i++) {
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                    push_a(thunk->_args[i]);
                    if(((FunEntry*) (thunk->desc))->strictness & argmask /*&& !arg->desc->hnf*/) 
                    { 
                        thunk->_args[i]->desc->eval(); 
                        thunk = stack_a[root_frame_ptr-1];
                    }
                    argmask <<= 1;
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                }
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                expr = ((FunEntry*) thunk->desc)->body;
                continue;
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            }
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            case FT_PRIM1:
            case FT_PRIM2:
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            {
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                for (int i = 0; i < thunk->desc->arity; i++) {
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                    push_a(thunk->_args[i]);
                    thunk->_args[i]->desc->eval();
                    thunk = stack_a[root_frame_ptr-1];
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                }

                ((PrimEntry*) thunk->desc)->exec(root_frame_ptr);
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                destroy_stack_frame(root_frame_ptr);
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                destroy_stack_frame_b(root_frame_ptr_b);                
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                return;
            }
            case FT_CAF:
            case FT_CAF_REDUCED:
                not_implemented("CAF");            
            case FT_SLICE:
            case FT_ADT:
            case FT_RECORD:
            case FT_BOXED_LIT:
                destroy_stack_frame(root_frame_ptr);
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                destroy_stack_frame_b(root_frame_ptr_b);
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                return;
            }            
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        }
        case CT_THUNK:
        {
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            Thunk* thunk = &((ThunkEntry*) expr)->thunk;            
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            Thunk* dst = get_dst(root_frame_ptr);

            if(dst != NULL)
            {
                memcpy(dst, thunk, sizeof(Thunk));
                
                if(!instackb(dst))
                {
                    set_return(root_frame_ptr, thunk);
                }                
            }
            else
            {
                set_return(root_frame_ptr, thunk);
            }

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            destroy_stack_frame(root_frame_ptr);
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            destroy_stack_frame_b(root_frame_ptr_b);
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            return;               
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        }
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        case CT_SELECT_LIT:
        {
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            placeholder();
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            exec(((SelectEntry*) expr)->expr, frame_ptr, stack_top_a);
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            Thunk* lit = pop_a();
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            bool handled = false;
            
            for (int i = 0; i < expr->nr_cases; i++) {
                SelectLitCaseEntry* caseEntry = &((SelectEntry*) expr)->cases[i];
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                // NULL means "default", we accept it anyway
                if(caseEntry->lit != NULL)
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                {
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                    assert(caseEntry->lit->thunk.desc != (Desc*) __INT__);
 
                    if(caseEntry->lit->thunk._int != lit->_int) continue;
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                }
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                // must be SC_DEFAULT now
                handled = true;
                expr = caseEntry->body;
                break;
            }
            
            if(handled) continue;
            
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            if(((SelectEntry*) expr)->fallback != NULL)
            {
                stack_top_a -= ((SelectEntry*) expr)->fallback_nrargs;
                expr = ((SelectEntry*) expr)->fallback;
                
                continue;
            }
            
            abort("no match");
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        }
        case CT_SELECT_ADT:
        {                        
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            SelectEntry* select = (SelectEntry*) expr;
            
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            push_a(NULL);
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            exec(select->expr, frame_ptr, stack_top_a);
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            Thunk* cons = pop_a();            
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            expr = select->bodies[((ADTEntry*)cons->desc)->idx];
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            if(expr != NULL)
            {
                for (int i = 0; i < cons->desc->arity; i++) {
                    push_a(cons->_args[i]);
                }                  
                
                continue;
            }
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            if(select->fallback != NULL)
            {
                stack_top_a -= select->fallback_nrargs;
                expr = select->fallback;
                
                continue;
            }
            
            abort("no match");
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        }
        case CT_IF:
        {        
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            placeholder();
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            exec(((IfEntry*) expr)->cond, frame_ptr, stack_top_a);
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            Thunk* cond = pop_a();
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            if (readB(cond)) {
                expr = ((IfEntry*) expr)->texpr;
                continue;                
            }
            else {
                expr = ((IfEntry*) expr)->fexpr;
                continue;     
            }
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        }
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        }
    }
}

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void eval_hnf()
{
    return;
}

void eval_fun()
{
    Thunk* thunk = peek_a();    
    int frame_ptr = stack_top_a;
    int argmask = 1;

    for (int i = 0; i < thunk->desc->arity; i++) {
        push_a(thunk->_args[i]);

        if(((FunEntry*) (thunk->desc))->strictness & argmask)
        {
            thunk->_args[i]->desc->eval();
            thunk = stack_a[frame_ptr-1]; // refresh thunk ptr after eval 
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        }
        
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        argmask <<= 1;
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    }

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    exec(((FunEntry*) thunk->desc)->body, frame_ptr, frame_ptr);
}
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void eval_prim()
{
    Thunk* thunk = peek_a();
    int frame_ptr = stack_top_a;

    for (int i = 0; i < thunk->desc->arity; i++) {
        push_a(thunk->_args[i]);        
        thunk->_args[i]->desc->eval();
        thunk = stack_a[frame_ptr-1]; // refresh thunk ptr after eval 
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    }
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    ((PrimEntry*) thunk->desc)->exec(frame_ptr);        

    stack_top_a = frame_ptr;        
}

void eval_fwd_ptr()
{
    Thunk* thunk = pop_a();
    follow_thunk(thunk);
    push_a(thunk);
    thunk->desc->eval();
}   
   
void set_eval_fun(Desc* desc)
{
    if(desc == (Desc*) __FORWARD_PTR__)
    {
        desc->eval = eval_fwd_ptr;
        return;
    }
    
    switch(desc->type)
    {
        case FT_BOXED_LIT:
        case FT_RECORD:
        case FT_ADT:
        case FT_CAF:
        case FT_CAF_REDUCED:
        case FT_SLICE:
            desc->eval = eval_hnf;
            break;
        case FT_FUN:
            desc->eval = eval_fun;
            break;
        case FT_PRIM1:
        case FT_PRIM2:
            desc->eval = eval_prim;
            break;
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    }
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}