code.c 14.5 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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// For compressing the source code a bit

#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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        dst->desc = (Desc*) __FORWARD_PTR__; \
        dst->_forward_ptr = thunk; 
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#define arg_from_thunk(descarg, arg) \
        if(((FunEntry*) (descarg))->strictness & argmask && !arg->desc->hnf) \
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        { \
            push_a(eval(arg)); \
        } \
        else \
        { \
            push_a(arg); \
        } \
        argmask <<= 1;

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#define arg_from_code(descarg, arg) \
        if(((FunEntry*) (descarg))->strictness & argmask) \
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        { \
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            Thunk* phl = alloc_b(); \
            phl->desc = (Desc*) __STACK_PLACEHOLDER__; \
            push_a(phl); \
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            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 = createF(((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)
{
    Thunk* basethunk = local(frame_ptr, ((AppEntry*)expr)->var.index);
    if(!basethunk->desc->hnf) basethunk = eval(basethunk);
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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 = createF(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);    
}

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

    if(arg->desc->unboxable)
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    {
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        return createT(arg);
    }
    else
    {
        return arg;
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    }
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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:
        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:
            code->create_thunk = create_thunk_var;
            break;
        case CT_VAR_STRICT:
            code->create_thunk = create_thunk_var_strict;
            break;
        case CT_THUNK:
            code->create_thunk = create_thunk_thunk;
            break;
        default:
            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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    int root_frame_ptr_b = stack_top_b;    
    
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    while(1)
    {
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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:
        {
            push_a(alloc_b());                        
            exec(((AppEntry*) expr)->args[0], frame_ptr, stack_top_a);
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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:
        {            
            push_a(alloc_b());                        
            exec(((AppEntry*) expr)->args[0], frame_ptr, stack_top_a);
            push_a(alloc_b());                        
            exec(((AppEntry*) expr)->args[1], frame_ptr, stack_top_a);

            ((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;            
        }
        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;

            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 = updateF(get_dst(root_frame_ptr), slice);
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            assert(thunk->desc->arity == expr->nr_args);

            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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            set_return(root_frame_ptr, thunk);
            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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            Thunk* basethunk = local(frame_ptr, ((AppEntry*)expr)->var.index);
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            if(!basethunk->desc->hnf) basethunk = eval(basethunk);
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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);

            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 < basethunk->desc->arity; i++) {
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                    if(basethunk->_args[i]->desc->hnf)
                    {
                        push_a(basethunk->_args[i]);
                    }
                    else
                    {
                        push_a(eval(basethunk->_args[i]));   
                    }
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                }
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                for (int i = 0; i < expr->nr_args; i++) {
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                    push_a(alloc_b());
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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;

                for (int i = 0; i < basethunk->desc->arity; i++) {
                    arg_from_thunk(slice, basethunk->_args[i])
                }

                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:
            {
                Thunk* thunk = updateF(get_dst(root_frame_ptr), slice);

                assert(thunk->desc->arity == basethunk->desc->arity + expr->nr_args);            

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

                set_return(root_frame_ptr, thunk);
                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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            Thunk* arg = local(frame_ptr, ((VarEntry*) expr)->index);
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            assert(is_hnf(arg));
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            if(arg->desc->unboxable)
            {
                arg = updateT(get_dst(root_frame_ptr), arg);
            }
            else
            {
                forward_thunk(arg, root_frame_ptr);
            }
            
            set_return(root_frame_ptr, arg);
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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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            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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                    arg_from_thunk(thunk->desc, thunk->_args[i]);
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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++) {
                    push_a(eval(thunk->_args[i]));
                }

                ((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;            
            forward_thunk(thunk, root_frame_ptr);            
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            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:
        {
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            Thunk* pattern = alloc_b();
            pattern->desc = (Desc*) __STACK_PLACEHOLDER__;
            push_a(pattern);
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            exec(((SelectEntry*) expr)->expr, frame_ptr, stack_top_a);
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            pattern = pop_a();
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            assert(is_hnf(pattern));
            assert(pattern->desc->type == FT_ADT);            
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            bool handled = false;
            
            for (int i = 0; i < expr->nr_cases; i++) {
                SelectCaseEntry* caseEntry = &((SelectEntry*) expr)->cases[i];
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                if (caseEntry->type == SC_CONS) {
                    // Pattern match
                    if ((Desc*) caseEntry->cons != pattern->desc) continue;

                    // Put the constructor arguments to the stack if matches
                    for (int i = 0; i < pattern->desc->arity; i++) {
                        push_a(pattern->_args[i]);
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                    }                  
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                }
                else if (caseEntry->type == SC_LIT) {
                    printf("Exec: Unhandled entry type in CT_SELECT (SC_LIT)");
                    exit(-1);
                }
                
                // must be SC_DEFAULT now
                handled = true;
                expr = caseEntry->body;
                break;
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            }

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            if(handled) continue;
            
            printf("Exec: no select cases matches");
            print(pattern, false);
            exit(-1);
        }
        case CT_IF:
        {        
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            push_a(alloc_b());
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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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        }
    }
}

struct Thunk* eval(Thunk* thunk) {
    assert(thunk != NULL);    
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    follow_thunk(thunk);
    
    switch(thunk->desc->type) {
    case FT_FUN:
    {
        push_a(thunk);
        int frame_ptr = stack_top_a;
        int argmask = 1;
        
        for (int i = 0; i < thunk->desc->arity; i++) {
            arg_from_thunk(thunk->desc, thunk->_args[i]);
        }
        
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        exec(((FunEntry*) thunk->desc)->body, frame_ptr, frame_ptr);
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        thunk = pop_a();
        return thunk;
    }
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    case FT_PRIM1:
    case FT_PRIM2:
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    {
        push_a(thunk);
        int frame_ptr = stack_top_a;

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

        ((PrimEntry*) thunk->desc)->exec(frame_ptr);        
        
        stack_top_a = frame_ptr;        
        thunk = pop_a();
        return thunk;
    }
    case FT_CAF:
    case FT_CAF_REDUCED:
        not_implemented("CAF");            
    case FT_SLICE:
    case FT_ADT:
    case FT_RECORD:
    case FT_BOXED_LIT:
        return thunk;
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    }
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}