#ifndef _GNU_SOURCE
#define _GNU_SOURCE // for strdup
#endif
#include <assert.h>
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include "compile.h"
#include "bytecode.h"
#include "locfile.h"
#include "jv_alloc.h"
#include "linker.h"
/*
The intermediate representation for jq filters is as a sequence of
struct inst, which form a doubly-linked list via the next and prev
pointers.
A "block" represents a sequence of "struct inst", which may be
empty.
Blocks are generated by the parser bottom-up, so may have free
variables (refer to things not defined). See inst.bound_by and
inst.symbol.
*/
struct inst {
struct inst* next;
struct inst* prev;
opcode op;
struct {
uint16_t intval;
struct inst* target;
jv constant;
const struct cfunction* cfunc;
} imm;
struct locfile* locfile;
location source;
// Binding
// An instruction requiring binding (for parameters/variables/functions)
// is in one of three states:
// inst->bound_by = NULL - Unbound free variable
// inst->bound_by = inst - This instruction binds a variable
// inst->bound_by = other - Uses variable bound by other instruction
// Unbound instructions (references to other things that may or may not
// exist) are created by "gen_foo_unbound", and bindings are created by
// block_bind(definition, body), which binds all instructions in
// body which are unboudn and refer to "definition" by name.
struct inst* bound_by;
char* symbol;
int nformals;
int nactuals;
block subfn; // used by CLOSURE_CREATE (body of function)
block arglist; // used by CLOSURE_CREATE (formals) and CALL_JQ (arguments)
// This instruction is compiled as part of which function?
// (only used during block_compile)
struct bytecode* compiled;
int bytecode_pos; // position just after this insn
};
static inst*