Emanuele Torre
6716e23ae6
You only need to specify the return type in a function pointer declaration in C. If you use () in the declaration, the function pointer can be called with any arguments, and the type of the arguments is decided for each function call based on the types of the arguments used for the call. (To declare a function pointer for a function with no arguments, you use `(void)'.) Since all the cfunction structs have a fptr that points to a functions that return jv, not void, we can we can just declare cfunction.fptr as jv (*)() and avoid having those annoying and technically not C-standard compliant casts everywhere.
92 lines
1.6 KiB
C
92 lines
1.6 KiB
C
#ifndef BYTECODE_H
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#define BYTECODE_H
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#include <stdint.h>
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#include "jv.h"
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typedef enum {
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#define OP(name, imm, in, out) name,
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#include "opcode_list.h"
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#undef OP
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} opcode;
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enum {
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NUM_OPCODES =
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#define OP(name, imm, in, out) +1
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#include "opcode_list.h"
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#undef OP
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};
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enum {
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OP_HAS_CONSTANT = 2,
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OP_HAS_VARIABLE = 4,
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OP_HAS_BRANCH = 8,
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OP_HAS_CFUNC = 32,
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OP_HAS_UFUNC = 64,
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OP_IS_CALL_PSEUDO = 128,
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OP_HAS_BINDING = 1024,
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// NOTE: Not actually part of any op -- a pseudo-op flag for special
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// handling of `break`.
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OP_BIND_WILDCARD = 2048,
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};
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struct opcode_description {
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opcode op;
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const char* name;
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int flags;
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// length in 16-bit units
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int length;
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int stack_in, stack_out;
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};
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const struct opcode_description* opcode_describe(opcode op);
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#define MAX_CFUNCTION_ARGS 10
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struct cfunction {
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jv (*fptr)();
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const char* name;
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int nargs;
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};
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struct symbol_table {
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struct cfunction* cfunctions;
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int ncfunctions;
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jv cfunc_names;
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};
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// The bytecode format matters in:
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// execute.c - interpreter
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// compile.c - compiler
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// bytecode.c - disassembler
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#define ARG_NEWCLOSURE 0x1000
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struct bytecode {
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uint16_t* code;
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int codelen;
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int nlocals;
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int nclosures;
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jv constants; // JSON array of constants
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struct symbol_table* globals;
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struct bytecode** subfunctions;
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int nsubfunctions;
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struct bytecode* parent;
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jv debuginfo;
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};
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void dump_disassembly(int, struct bytecode* code);
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void dump_operation(struct bytecode* bc, uint16_t* op);
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int bytecode_operation_length(uint16_t* codeptr);
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void bytecode_free(struct bytecode* bc);
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#endif
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