Blame src/arbits/slbt_archive_dlsyms.c

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/*******************************************************************/
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/*  slibtool: a skinny libtool implementation, written in C        */
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/*  Copyright (C) 2016--2024  SysDeer Technologies, LLC            */
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/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
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/*******************************************************************/
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#include <slibtool/slibtool.h>
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#include "slibtool_ar_impl.h"
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#include "slibtool_driver_impl.h"
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#include "slibtool_snprintf_impl.h"
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#include "slibtool_errinfo_impl.h"
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static int slbt_ar_dlsyms_define_by_type(
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	int                                 fdout,
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	const char *                        arname,
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	struct slbt_archive_meta_impl *     mctx,
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	const char *                        desc,
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	const char                          stype)
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{
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	uint64_t idx;
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	uint64_t nsyms = 0;
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	for (idx=0; idx<mctx->armaps.armap_nsyms; idx++)
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		if (mctx->syminfv[idx]->ar_symbol_type[0] == stype)
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			nsyms++;
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	if (nsyms == 0)
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		return 0;
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	if (slbt_dprintf(fdout,"/* %s (%s) */\n",desc,arname) < 0)
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		return SLBT_SYSTEM_ERROR(mctx->dctx,0);
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	for (idx=0; idx<mctx->armaps.armap_nsyms; idx++)
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		if (mctx->syminfv[idx]->ar_symbol_type[0] == stype)
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			if (slbt_dprintf(fdout,
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					(stype == 'T')
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						? "extern int %s();\n"
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						: "extern char %s[];\n",
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					mctx->syminfv[idx]->ar_symbol_name) < 0)
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				return SLBT_SYSTEM_ERROR(mctx->dctx,0);
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	if (slbt_dprintf(fdout,"\n") < 0)
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		return SLBT_SYSTEM_ERROR(mctx->dctx,0);
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	return 0;
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}
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static int slbt_ar_dlsyms_get_max_len_by_type(
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	int                                 mlen,
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	struct slbt_archive_meta_impl *     mctx,
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	const char                          stype)
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{
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	int      len;
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	uint64_t idx;
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	for (idx=0; idx<mctx->armaps.armap_nsyms; idx++)
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		if (mctx->syminfv[idx]->ar_symbol_type[0] == stype)
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			if ((len = strlen(mctx->syminfv[idx]->ar_symbol_name)) > mlen)
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				mlen = len;
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	return mlen;
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}
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static int slbt_ar_dlsyms_add_by_type(
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	int                                 fdout,
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	struct slbt_archive_meta_impl *     mctx,
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	const char *                        fmt,
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	const char                          stype,
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	char                                (*namebuf)[4096])
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{
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	uint64_t  idx;
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	uint64_t  nsyms;
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	char *    symname;
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	nsyms   = 0;
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	symname = *namebuf;
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	for (idx=0; idx<mctx->armaps.armap_nsyms; idx++)
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		if (mctx->syminfv[idx]->ar_symbol_type[0] == stype)
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			nsyms++;
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	if (nsyms == 0)
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		return 0;
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	if (slbt_dprintf(fdout,"\n") < 0)
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		return SLBT_SYSTEM_ERROR(mctx->dctx,0);
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	for (idx=0; idx<mctx->armaps.armap_nsyms; idx++) {
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		if (mctx->syminfv[idx]->ar_symbol_type[0] == stype) {
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			if (slbt_snprintf(symname,sizeof(*namebuf),
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					"%s\",",
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					mctx->syminfv[idx]->ar_symbol_name) < 0)
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				return SLBT_SYSTEM_ERROR(mctx->dctx,0);
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			if (slbt_dprintf(fdout,fmt,
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					symname,
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					(stype == 'T') ? "&" : "",
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					mctx->syminfv[idx]->ar_symbol_name) < 0)
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				return SLBT_NESTED_ERROR(mctx->dctx);
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		}
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	}
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	return 0;
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}
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static int slbt_ar_output_dlsyms_impl(
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	int                                 fdout,
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	const struct slbt_driver_ctx *      dctx,
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	struct slbt_archive_ctx **          arctxv,
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	const char *                        dsounit)
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{
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	int                                 ret;
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	int                                 idx;
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	unsigned                            len;
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	unsigned                            cmp;
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	const char *                        arname;
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	const char *                        soname;
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	struct slbt_archive_ctx *           actx;
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	struct slbt_archive_ctx **          parctx;
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	struct slbt_archive_ctx_impl *      ictx;
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	struct slbt_archive_meta_impl *     mctx;
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	const struct slbt_source_version *  verinfo;
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	char                                dlsymfmt[32];
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	char                                cline[6][73];
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	char                                symname[4096];
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	/* init */
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	actx    = arctxv[0];
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	verinfo = slbt_api_source_version();
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	/* preamble */
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	memset(cline[0],'*',72);
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	memset(cline[1],' ',72);
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	memset(cline[2],' ',72);
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	memset(cline[3],' ',72);
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	memset(cline[4],'*',72);
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	memset(cline[5],0,72);
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	cline[5][0] = '\n';
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	len = snprintf(&cline[1][3],69,
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		"backward-compatible dlsym table");
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	cline[1][3+len] = ' ';
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	len = snprintf(&cline[2][3],69,
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		"Generated by %s (slibtool %d.%d.%d)",
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		dctx->program,
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		verinfo->major,verinfo->minor,verinfo->revision);
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	cline[2][3+len] = ' ';
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	len = snprintf(&cline[3][3],69,
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		"[commit reference: %s]",
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		verinfo->commit);
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	cline[3][3+len] = ' ';
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	for (idx=0; idx<5; idx++) {
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		cline[idx][0] = '/';
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		cline[idx][1] = '*';
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		cline[idx][70] = '*';
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		cline[idx][71] = '/';
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		cline[idx][72] = '\n';
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	}
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	if (slbt_dprintf(fdout,"%s",&cline[0]) < 0)
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		return SLBT_SYSTEM_ERROR(dctx,0);
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	if (slbt_dprintf(fdout,
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			"#ifdef __cplusplus\n"
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			"extern \"C\" {\n"
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			"#endif\n\n") < 0)
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		return SLBT_SYSTEM_ERROR(dctx,0);
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	/* declarations */
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	for (parctx=arctxv; *parctx; parctx++) {
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		actx   = *parctx;
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		ictx   = slbt_get_archive_ictx(actx);
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		mctx   = slbt_archive_meta_ictx(ictx->meta);
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		if ((arname = strrchr(*actx->path,'/')))
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			arname++;
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		if (!arname)
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			arname = *actx->path;
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		ret  = slbt_ar_dlsyms_define_by_type(fdout,arname,mctx,"Data Symbols: Absolute Values",     'A');
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		ret |= slbt_ar_dlsyms_define_by_type(fdout,arname,mctx,"Data Symbols: BSS Section",         'B');
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		ret |= slbt_ar_dlsyms_define_by_type(fdout,arname,mctx,"Data Symbols: Common Section",      'C');
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		ret |= slbt_ar_dlsyms_define_by_type(fdout,arname,mctx,"Data Symbols: Initialized Data",    'D');
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		ret |= slbt_ar_dlsyms_define_by_type(fdout,arname,mctx,"Data Symbols: Small Globals",       'G');
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		ret |= slbt_ar_dlsyms_define_by_type(fdout,arname,mctx,"Data Symbols: Indirect References", 'I');
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		ret |= slbt_ar_dlsyms_define_by_type(fdout,arname,mctx,"Data Symbols: Read-Only Section",   'R');
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		ret |= slbt_ar_dlsyms_define_by_type(fdout,arname,mctx,"Data Symbols: Small Objects",       'S');
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		ret |= slbt_ar_dlsyms_define_by_type(fdout,arname,mctx,"Data Symbols: Weak Symbols",        'W');
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		ret |= slbt_ar_dlsyms_define_by_type(fdout,arname,mctx,"Text Section: Public Interfaces",   'T');
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		if (ret < 0)
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			return SLBT_NESTED_ERROR(dctx);
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	}
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	/* vtable struct definition */
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	if (slbt_dprintf(fdout,
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			"/* name-address Public ABI struct definition */\n"
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			"struct lt_dlsym_symdef {\n"
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			"\tconst char *   dlsym_name;\n"
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			"\tvoid *         dlsym_addr;\n"
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			"};\n\n") < 0)
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		return SLBT_NESTED_ERROR(dctx);
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	soname = (strcmp(dsounit,"@PROGRAM@")) ? dsounit : "_PROGRAM_";
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	if (slbt_dprintf(fdout,
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			"/* dlsym vtable */\n"
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			"extern const struct lt_dlsym_symdef "
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			"lt_%s_LTX_preloaded_symbols[];\n\n"
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			"const struct lt_dlsym_symdef "
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			"lt_%s_LTX_preloaded_symbols[] = {\n",
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			soname,soname) < 0)
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		return SLBT_NESTED_ERROR(dctx);
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	/* align dlsym_name and dlsym_addr columsn (because we can) */
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	for (parctx=arctxv,len=0; *parctx; parctx++) {
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		actx = *parctx;
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		ictx = slbt_get_archive_ictx(actx);
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		mctx = slbt_archive_meta_ictx(ictx->meta);
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		if ((arname = strrchr(*actx->path,'/')))
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			arname++;
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		if (!arname)
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			arname = *actx->path;
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		if (len < (cmp = strlen(arname)))
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			len = cmp;
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		len  = slbt_ar_dlsyms_get_max_len_by_type(len,mctx,'A');
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		len  = slbt_ar_dlsyms_get_max_len_by_type(len,mctx,'B');
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		len  = slbt_ar_dlsyms_get_max_len_by_type(len,mctx,'C');
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		len  = slbt_ar_dlsyms_get_max_len_by_type(len,mctx,'D');
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		len  = slbt_ar_dlsyms_get_max_len_by_type(len,mctx,'G');
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		len  = slbt_ar_dlsyms_get_max_len_by_type(len,mctx,'I');
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		len  = slbt_ar_dlsyms_get_max_len_by_type(len,mctx,'R');
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		len  = slbt_ar_dlsyms_get_max_len_by_type(len,mctx,'S');
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		len  = slbt_ar_dlsyms_get_max_len_by_type(len,mctx,'T');
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		len  = slbt_ar_dlsyms_get_max_len_by_type(len,mctx,'W');
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	}
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	/* quote, comma */
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	len += 2;
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	if (len >= sizeof(symname))
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		return SLBT_CUSTOM_ERROR(
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			dctx,
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			SLBT_ERR_FLOW_ERROR);
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	/* aligned print format */
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	snprintf(dlsymfmt,sizeof(dlsymfmt),"\t{\"%%-%ds %%s%%s},\n",len);
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	/* dso unit */
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	if (slbt_snprintf(symname,sizeof(symname),"%s\",",dsounit) < 0)
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		return SLBT_SYSTEM_ERROR(dctx,0);
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	if (slbt_dprintf(fdout,dlsymfmt,symname,"","0") < 0)
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		return SLBT_NESTED_ERROR(dctx);
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	/* (-dlopen force) */
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	if (!arctxv[0]->meta->a_memberv)
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		if (!strcmp(*arctxv[0]->path,"@PROGRAM@"))
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			arctxv++;
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	/* at long last */
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	for (parctx=arctxv; *parctx; parctx++) {
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		actx = *parctx;
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		ictx = slbt_get_archive_ictx(actx);
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		mctx = slbt_archive_meta_ictx(ictx->meta);
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		if ((arname = strrchr(*actx->path,'/')))
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			arname++;
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		if (!arname)
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			arname = *actx->path;
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		if (slbt_dprintf(fdout,"\n") < 0)
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			return SLBT_NESTED_ERROR(mctx->dctx);
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		if (slbt_snprintf(symname,sizeof(symname),"%s\",",arname) < 0)
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			return SLBT_SYSTEM_ERROR(mctx->dctx,0);
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		if (slbt_dprintf(fdout,dlsymfmt,symname,"","0") < 0)
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			return SLBT_NESTED_ERROR(mctx->dctx);
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		ret  = slbt_ar_dlsyms_add_by_type(fdout,mctx,dlsymfmt,'A',&symname);
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		ret |= slbt_ar_dlsyms_add_by_type(fdout,mctx,dlsymfmt,'B',&symname);
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		ret |= slbt_ar_dlsyms_add_by_type(fdout,mctx,dlsymfmt,'C',&symname);
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		ret |= slbt_ar_dlsyms_add_by_type(fdout,mctx,dlsymfmt,'D',&symname);
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		ret |= slbt_ar_dlsyms_add_by_type(fdout,mctx,dlsymfmt,'G',&symname);
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		ret |= slbt_ar_dlsyms_add_by_type(fdout,mctx,dlsymfmt,'I',&symname);
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		ret |= slbt_ar_dlsyms_add_by_type(fdout,mctx,dlsymfmt,'R',&symname);
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		ret |= slbt_ar_dlsyms_add_by_type(fdout,mctx,dlsymfmt,'S',&symname);
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		ret |= slbt_ar_dlsyms_add_by_type(fdout,mctx,dlsymfmt,'S',&symname);
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		ret |= slbt_ar_dlsyms_add_by_type(fdout,mctx,dlsymfmt,'T',&symname);
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		if (ret < 0)
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			return SLBT_NESTED_ERROR(dctx);
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	}
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	/* null-terminate the vtable */
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	if (slbt_dprintf(fdout,"\n\t{%d,%*c%d}\n",0,len,' ',0) < 0)
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		return SLBT_NESTED_ERROR(mctx->dctx);
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	/* close vtable, wrap translation unit */
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	if (slbt_dprintf(fdout,
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			"};\n\n"
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			"#ifdef __cplusplus\n"
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			"}\n"
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			"#endif\n") < 0)
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		return SLBT_SYSTEM_ERROR(dctx,0);
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	return 0;
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}
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static int slbt_ar_create_dlsyms_impl(
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	struct slbt_archive_ctx **        arctxv,
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	const char *                      dlunit,
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	const char *                      path,
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	mode_t                            mode)
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{
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	int                               ret;
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	struct slbt_archive_ctx **        actx;
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	struct slbt_exec_ctx *            ectx;
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	struct slbt_archive_meta_impl *   mctx;
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	const struct slbt_driver_ctx *    dctx;
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	struct slbt_fd_ctx                fdctx;
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	int                               fdout;
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	mctx = slbt_archive_meta_ictx(arctxv[0]->meta);
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	dctx = mctx->dctx;
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	ectx = 0;
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	if (slbt_lib_get_driver_fdctx(dctx,&fdctx) < 0)
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		return SLBT_NESTED_ERROR(dctx);
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	if (path) {
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		if ((fdout = openat(
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				fdctx.fdcwd,path,
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				O_WRONLY|O_CREAT|O_TRUNC,
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				mode)) < 0)
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			return SLBT_SYSTEM_ERROR(dctx,path);
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	} else {
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		fdout = fdctx.fdout;
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	}
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	for (actx=arctxv; *actx; actx++) {
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		mctx = slbt_archive_meta_ictx((*actx)->meta);
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		if (!mctx->syminfo && !ectx)
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			if (slbt_ectx_get_exec_ctx(dctx,&ectx) < 0)
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				return SLBT_NESTED_ERROR(dctx);
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		if (!mctx->syminfo)
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			if (slbt_ar_update_syminfo(*actx,ectx) < 0)
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				return SLBT_NESTED_ERROR(dctx);
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	}
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	if (ectx)
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		slbt_ectx_free_exec_ctx(ectx);
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	ret = slbt_ar_output_dlsyms_impl(
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		fdout,dctx,arctxv,dlunit);
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	if (path) {
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		close(fdout);
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	}
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	return ret;
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}
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int slbt_ar_create_dlsyms(
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	struct slbt_archive_ctx **  arctxv,
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	const char *                dlunit,
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	const char *                path,
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	mode_t                      mode)
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{
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	return slbt_ar_create_dlsyms_impl(arctxv,dlunit,path,mode);
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}