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/***********************************************************************/
/* */
/* Objective Caml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* Automatique. Distributed only by permission. */
/* */
/***********************************************************************/
/* $Id$ */
/* Handling of blocks of bytecode (endianness switch, threading). */
#include "config.h"
#include "debugger.h"
#include "fix_code.h"
#include "memory.h"
#include "misc.h"
#include "mlvalues.h"
#include "instruct.h"
#include "reverse.h"
#ifdef HAS_UNISTD
#include <unistd.h>
#endif
code_t start_code;
asize_t code_size;
unsigned char * saved_code;
/* Read the main bytecode block from a file */
void load_code(fd, len)
int fd;
asize_t len;
{
int i;
code_size = len;
start_code = (code_t) stat_alloc(code_size);
if (read(fd, (char *) start_code, code_size) != code_size)
fatal_error("Fatal error: truncated bytecode file.\n");
#ifdef BIG_ENDIAN
fixup_endianness(start_code, code_size);
#endif
if (debugger_in_use) {
len /= sizeof(opcode_t);
saved_code = (unsigned char *) stat_alloc(len);
for (i = 0; i < len; i++) saved_code[i] = start_code[i];
}
#ifdef THREADED_CODE
/* Better to thread now than at the beginning of interprete(),
since the debugger interface needs to perform SET_EVENT requests
on the code. */
thread_code(start_code, code_size);
#endif
}
/* This code is needed only if the processor is big endian */
#ifdef ARCH_BIG_ENDIAN
void fixup_endianness(code, len)
code_t code;
asize_t len;
{
code_t p;
len /= sizeof(opcode_t);
for (p = code; p < code + len; p++) {
Reverse_int32(p);
}
}
#endif
/* This code is needed only if we're using threaded code */
#ifdef THREADED_CODE
void ** instr_table;
void thread_code (code_t code, asize_t len)
{
code_t p;
int l [STOP + 1];
int i;
for (i = 0; i <= STOP; 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[GETFIELD] = l[SETFIELD] = l[DUMMY] =
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] = 1;
/* Instructions with two operands */
l[APPTERM] = l[CLOSURE] = l[CLOSUREREC] = l[PUSHGETGLOBALFIELD] =
l[GETGLOBALFIELD] = l[MAKEBLOCK] = l[C_CALLN] = 2;
len /= sizeof(opcode_t);
for (p = code; p < code + len; /*nothing*/) {
opcode_t instr = *p;
if (instr < 0 || instr > STOP){
fatal_error_arg ("Fatal error: bad opcode (%lx)\n", (void *) instr);
}
*p++ = (opcode_t)((unsigned long)(instr_table[instr]));
if (instr == SWITCH) {
uint32 sizes = *p++;
uint32 const_size = sizes & 0xFFFF;
uint32 block_size = sizes >> 16;
p += const_size + block_size;
} else {
p += l[instr];
}
}
Assert(p == code + len);
}
#endif /* THREADED_CODE */
void set_instruction(pos, instr)
code_t pos;
opcode_t instr;
{
#ifdef THREADED_CODE
*pos = (opcode_t)((unsigned long)(instr_table[instr]));
#else
*pos = instr;
#endif
}
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