160 lines
4.5 KiB
C
160 lines
4.5 KiB
C
/***********************************************************************/
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/* */
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/* Objective Caml */
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/* */
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/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
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/* */
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/* Copyright 1996 Institut National de Recherche en Informatique et */
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/* en Automatique. All rights reserved. This file is distributed */
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/* under the terms of the GNU Library General Public License. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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/* Handling of blocks of bytecode (endianness switch, threading). */
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#include "config.h"
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#include "debugger.h"
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#include "fix_code.h"
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#include "instruct.h"
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#include "md5.h"
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#include "memory.h"
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#include "misc.h"
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#include "mlvalues.h"
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#include "reverse.h"
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#ifdef HAS_UNISTD
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#include <unistd.h>
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#endif
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code_t start_code;
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asize_t code_size;
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unsigned char * saved_code;
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unsigned char code_md5[16];
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/* Read the main bytecode block from a file */
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void load_code(int fd, asize_t len)
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{
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int i;
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struct MD5Context ctx;
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code_size = len;
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start_code = (code_t) stat_alloc(code_size);
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if (read(fd, (char *) start_code, code_size) != code_size)
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fatal_error("Fatal error: truncated bytecode file.\n");
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MD5Init(&ctx);
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MD5Update(&ctx, (unsigned char *) start_code, code_size);
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MD5Final(code_md5, &ctx);
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#ifdef ARCH_BIG_ENDIAN
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fixup_endianness(start_code, code_size);
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#endif
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if (debugger_in_use) {
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len /= sizeof(opcode_t);
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saved_code = (unsigned char *) stat_alloc(len);
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for (i = 0; i < len; i++) saved_code[i] = start_code[i];
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}
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#ifdef THREADED_CODE
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/* Better to thread now than at the beginning of interprete(),
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since the debugger interface needs to perform SET_EVENT requests
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on the code. */
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thread_code(start_code, code_size);
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#endif
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}
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/* This code is needed only if the processor is big endian */
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#ifdef ARCH_BIG_ENDIAN
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void fixup_endianness(code_t code, asize_t len)
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{
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code_t p;
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len /= sizeof(opcode_t);
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for (p = code; p < code + len; p++) {
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Reverse_32(p, p);
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}
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}
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#endif
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/* This code is needed only if we're using threaded code */
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#ifdef THREADED_CODE
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char ** instr_table;
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char * instr_base;
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void thread_code (code_t code, asize_t len)
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{
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code_t p;
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int l [STOP + 1];
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int i;
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for (i = 0; i <= STOP; i++) {
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l [i] = 0;
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}
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/* Instructions with one operand */
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l[PUSHACC] = l[ACC] = l[POP] = l[ASSIGN] =
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l[PUSHENVACC] = l[ENVACC] = l[PUSH_RETADDR] = l[APPLY] =
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l[APPTERM1] = l[APPTERM2] = l[APPTERM3] = l[RETURN] =
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l[GRAB] = l[PUSHGETGLOBAL] = l[GETGLOBAL] = l[SETGLOBAL] =
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l[PUSHATOM] = l[ATOM] = l[MAKEBLOCK1] = l[MAKEBLOCK2] =
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l[MAKEBLOCK3] = l[MAKEFLOATBLOCK] = l[GETFIELD] =
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l[GETFLOATFIELD] = l[SETFIELD] = l[SETFLOATFIELD] =
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l[BRANCH] = l[BRANCHIF] = l[BRANCHIFNOT] = l[PUSHTRAP] =
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l[C_CALL1] = l[C_CALL2] = l[C_CALL3] = l[C_CALL4] = l[C_CALL5] =
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l[CONSTINT] = l[PUSHCONSTINT] = l[OFFSETINT] =
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l[OFFSETREF] = l[OFFSETCLOSURE] = l[PUSHOFFSETCLOSURE] = 1;
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/* Instructions with two operands */
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l[APPTERM] = l[CLOSURE] = l[PUSHGETGLOBALFIELD] =
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l[GETGLOBALFIELD] = l[MAKEBLOCK] = l[C_CALLN] =
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l[BEQ] = l[BNEQ] = l[BLTINT] = l[BLEINT] = l[BGTINT] = l[BGEINT] =
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l[BULTINT] = l[BUGEINT] = 2;
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len /= sizeof(opcode_t);
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for (p = code; p < code + len; /*nothing*/) {
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opcode_t instr = *p;
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if (instr < 0 || instr > STOP){
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/*
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fatal_error_arg ("Fatal error in fix_code: bad opcode (%lx)\n",
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(char *)(long)instr);
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*/
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instr = STOP;
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}
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*p++ = (opcode_t)(instr_table[instr] - instr_base);
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if (instr == SWITCH) {
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uint32 sizes = *p++;
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uint32 const_size = sizes & 0xFFFF;
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uint32 block_size = sizes >> 16;
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p += const_size + block_size;
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} else if (instr == CLOSUREREC) {
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uint32 nfuncs = *p++;
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p++; /* skip nvars */
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p += nfuncs;
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} else {
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p += l[instr];
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}
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}
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Assert(p == code + len);
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}
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#endif /* THREADED_CODE */
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void set_instruction(code_t pos, opcode_t instr)
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{
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#ifdef THREADED_CODE
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*pos = (opcode_t)(instr_table[instr] - instr_base);
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#else
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*pos = instr;
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#endif
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}
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int is_instruction(opcode_t instr1, opcode_t instr2)
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{
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#ifdef THREADED_CODE
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return instr1 == (opcode_t)(instr_table[instr2] - instr_base);
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#else
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return instr1 == instr2;
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#endif
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}
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