82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
#ifndef FRAME_LAYOUT_H
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#include "forkable_stack.h"
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#include "bytecode.h"
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#include <jansson.h>
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struct closure {
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struct bytecode* bc;
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uint16_t* pc;
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};
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typedef union frame_elem {
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FORKABLE_STACK_HEADER;
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struct closure closure;
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json_t* jsonval;
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} *frame_ptr;
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/*
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* Frame layout
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* fr[0] - FORKABLE_STACK_HEADER (next pointer)
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* fr[1] - self (used to store return addresses, etc)
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* fr[2...nclosures+2] - closure params
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* fr[nclosures+2..nclosures+nlocals+2] - local variables
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*/
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static int frame_size(struct bytecode* bc) {
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return sizeof(union frame_elem) * (bc->nclosures + bc->nlocals + 2);
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}
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static struct closure* frame_self(frame_ptr fr) {
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return &fr[1].closure;
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}
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static struct closure* frame_closure_arg(frame_ptr fr, int closure) {
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assert(closure >= 0);
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assert(closure < frame_self(fr)->bc->nclosures);
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return &fr[2+closure].closure;
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}
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static json_t** frame_local_var(frame_ptr fr, int var) {
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assert(var >= 0);
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assert(var < frame_self(fr)->bc->nlocals);
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return &fr[2 + frame_self(fr)->bc->nclosures + var].jsonval;
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}
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static frame_ptr frame_current(struct forkable_stack* stk) {
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frame_ptr fp = forkable_stack_peek(stk);
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struct bytecode* bc = frame_self(fp)->bc;
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assert(frame_self(fp)->pc >= bc->code && frame_self(fp)->pc < bc->code + bc->codelen);
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return fp;
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}
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static struct bytecode* frame_current_bytecode(struct forkable_stack* stk) {
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return frame_self(frame_current(stk))->bc;
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}
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static uint16_t** frame_current_pc(struct forkable_stack* stk) {
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return &frame_self(frame_current(stk))->pc;
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}
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static void frame_push(struct forkable_stack* stk, struct bytecode* bc) {
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frame_ptr fp = forkable_stack_push(stk, frame_size(bc));
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frame_self(fp)->bc = bc;
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frame_self(fp)->pc = bc->code;
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}
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static void frame_push_backtrack(struct forkable_stack* stk,
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struct bytecode* bc, uint16_t* pc) {
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frame_ptr fp = forkable_stack_push(stk, sizeof(union frame_elem) * 2);
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frame_self(fp)->bc = bc;
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frame_self(fp)->pc = pc;
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}
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static void frame_pop(struct forkable_stack* stk) {
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forkable_stack_pop(stk);
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}
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#endif
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