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/**************************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. */
/* */
/* All rights reserved. This file is distributed under the terms of */
/* the GNU Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
#define CAML_INTERNALS
/* Handling of blocks of bytecode (endianness switch, threading). */
#include "caml/config.h"
#ifdef HAS_UNISTD
#include <unistd.h>
#else
#include <io.h>
#endif
#include "caml/codefrag.h"
#include "caml/debugger.h"
#include "caml/fix_code.h"
#include "caml/instruct.h"
#include "caml/intext.h"
#include "caml/memory.h"
#include "caml/misc.h"
#include "caml/mlvalues.h"
#include "caml/reverse.h"
code_t caml_start_code;
asize_t caml_code_size;
/* Read the main bytecode block from a file */
void caml_init_code_fragments(void) {
/* Register the main bytecode block in the table of code fragments */
caml_register_code_fragment((char *) caml_start_code,
(char *) caml_start_code + caml_code_size,
DIGEST_NOW, NULL);
}
void caml_load_code(int fd, asize_t len)
{
caml_code_size = len;
caml_start_code = (code_t) caml_stat_alloc(caml_code_size);
if (read(fd, (char *) caml_start_code, caml_code_size) != caml_code_size)
caml_fatal_error("truncated bytecode file");
caml_init_code_fragments();
/* Prepare the code for execution */
#ifdef ARCH_BIG_ENDIAN
caml_fixup_endianness(caml_start_code, caml_code_size);
#endif
#ifdef THREADED_CODE
caml_thread_code(caml_start_code, caml_code_size);
#endif
}
/* This code is needed only if the processor is big endian */
#ifdef ARCH_BIG_ENDIAN
void caml_fixup_endianness(code_t code, asize_t len)
{
len /= sizeof(opcode_t);
for (code_t p = code; p < code + len; p++) {
Reverse_32(p, p);
}
}
#endif
/* This code is needed only if we're using threaded code */
#ifdef THREADED_CODE
static const char * const * caml_instr_table;
static const char * caml_instr_base;
void caml_init_thread_code(const void * const * instr_table,
const void * instr_base)
{
caml_instr_table = (const char * const *) instr_table;
caml_instr_base = (const char *) instr_base;
}
static int* opcode_nargs = NULL;
int* caml_init_opcode_nargs(void)
{
if( opcode_nargs == NULL ){
int* l = (int*)caml_stat_alloc(sizeof(int) * FIRST_UNIMPLEMENTED_OP);
for (int i = 0; i < FIRST_UNIMPLEMENTED_OP; i++) {
l [i] = 0;
}
/* Instructions with one operand */
l[PUSHACC] = l[ACC] = l[POP] = l[ASSIGN] =
l[PUSHENVACC] = l[ENVACC] = l[PUSH_RETADDR] = l[APPLY] =
l[APPTERM1] = l[APPTERM2] = l[APPTERM3] = l[RETURN] =
l[GRAB] = l[PUSHGETGLOBAL] = l[GETGLOBAL] = l[SETGLOBAL] =
l[PUSHATOM] = l[ATOM] = l[MAKEBLOCK1] = l[MAKEBLOCK2] =
l[MAKEBLOCK3] = l[MAKEFLOATBLOCK] = l[GETFIELD] =
l[GETFLOATFIELD] = l[SETFIELD] = l[SETFLOATFIELD] =
l[BRANCH] = l[BRANCHIF] = l[BRANCHIFNOT] = l[PUSHTRAP] =
l[C_CALL1] = l[C_CALL2] = l[C_CALL3] = l[C_CALL4] = l[C_CALL5] =
l[CONSTINT] = l[PUSHCONSTINT] = l[OFFSETINT] =
l[OFFSETREF] = l[OFFSETCLOSURE] = l[PUSHOFFSETCLOSURE] =
l[RESUMETERM] = l[REPERFORMTERM] = 1;
/* Instructions with two operands */
l[APPTERM] = l[CLOSURE] = l[PUSHGETGLOBALFIELD] =
l[GETGLOBALFIELD] = l[MAKEBLOCK] = l[C_CALLN] =
l[BEQ] = l[BNEQ] = l[BLTINT] = l[BLEINT] = l[BGTINT] = l[BGEINT] =
l[BULTINT] = l[BUGEINT] = l[GETPUBMET] = 2;
opcode_nargs = l;
}
return opcode_nargs;
}
void caml_thread_code (code_t code, asize_t len)
{
code_t p;
int* l = caml_init_opcode_nargs();
len /= sizeof(opcode_t);
for (p = code; p < code + len; /*nothing*/) {
opcode_t instr = *p;
if (instr < 0 || instr >= FIRST_UNIMPLEMENTED_OP){
/* FIXME -- should Assert(false) ?
caml_fatal_error ("in fix_code: bad opcode (%lx)",
(char *)(long)instr);
*/
instr = STOP;
}
*p++ = (opcode_t)(caml_instr_table[instr] - caml_instr_base);
if (instr == SWITCH) {
uint32_t sizes = *p++;
uint32_t const_size = sizes & 0xFFFF;
uint32_t block_size = sizes >> 16;
p += const_size + block_size;
} else if (instr == CLOSUREREC) {
uint32_t nfuncs = *p++;
p++; /* skip nvars */
p += nfuncs;
} else {
p += l[instr];
}
}
CAMLassert(p == code + len);
}
#else
int* caml_init_opcode_nargs(void)
{
return NULL;
}
#endif /* THREADED_CODE */
void caml_set_instruction(code_t pos, opcode_t instr)
{
#ifdef THREADED_CODE
*pos = (opcode_t)(caml_instr_table[instr] - caml_instr_base);
#else
*pos = instr;
#endif
}
int caml_is_instruction(opcode_t instr1, opcode_t instr2)
{
#ifdef THREADED_CODE
return instr1 == (opcode_t)(caml_instr_table[instr2] - caml_instr_base);
#else
return instr1 == instr2;
#endif
}
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