Blame src/driver/amgc_unit_ctx.c

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/**********************************************************/
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/*  apimagic: cparser-based API normalization utility     */
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/*  Copyright (C) 2015--2021  SysDeer Technologies, LLC   */
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/*  Released under GPLv2 and GPLv3; see COPYING.APIMAGIC. */
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/**********************************************************/
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#include <stdio.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/mman.h>
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#include <cparser/driver/driver.h>
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#include <cparser/driver/c_driver.h>
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#include <apimagic/apimagic.h>
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#include "apimagic_driver_impl.h"
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#include "apimagic_errinfo_impl.h"
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static int amgc_free_unit_ctx_impl(struct amgc_unit_ctx_impl * ctx, int ret)
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{
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	if (ctx) {
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		if (ctx->entities)
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			amgc_free_unit_entities(ctx->entities);
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		free(ctx);
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	}
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	return ret;
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}
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static int amgc_stdin_to_tmp(const struct amgc_driver_ctx * dctx)
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{
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	struct amgc_driver_ctx_impl *	ictx;
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	uintptr_t			addr;
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	int				fdtmp;
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	ssize_t ret;
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	ssize_t cnt;
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	char *	ch;
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	char	buf[4096];
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	char	template[] = "/tmp/amgc_stdin_to_tmp_XXXXXX";
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	addr = (uintptr_t)dctx - offsetof(struct amgc_driver_ctx_impl,ctx);
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	ictx = (struct amgc_driver_ctx_impl *)addr;
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	if (ictx->fdtmpin >= 0)
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		return dup(ictx->fdtmpin);
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	if ((fdtmp = mkstemp(template)) < 0)
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		return -1;
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	if ((ictx->fdtmpin = dup(fdtmp)) < 0) {
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		close(fdtmp);
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		return -1;
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	}
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	for (;;) {
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		ret = read(0,buf,sizeof(buf)-1);
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		while ((ret < 0) && (errno == EINTR))
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			ret = read(0,buf,sizeof(buf)-1);
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		if (ret < 0) {
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			close(fdtmp);
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			return -1;
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		} else if (ret == 0) {
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			return fdtmp;
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		} else {
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			ch  = buf;
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			cnt = ret;
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			ret = 0;
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			for (; cnt; ) {
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				ret = write(fdtmp,ch,cnt);
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				while ((ret < 0) && (errno == EINTR))
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					ret = write(fdtmp,ch,cnt);
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				if (ret < 0) {
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					close(fdtmp);
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					return -1;
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				}
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				ch  += ret;
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				cnt -= ret;
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			}
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		}
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	}
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}
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static bool amgc_cparser_no_op(
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	compilation_env_t *	env,
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	compilation_unit_t *	unit)
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{
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	(void)env;
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	(void)unit;
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	return true;
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}
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static void amgc_init_cparser_unit(void)
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{
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	set_default_handlers();
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	/* parse only */
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	set_unit_handler(COMPILATION_UNIT_AST,
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			build_firm_ir,true);
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	/* assign no-op handler */
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	set_unit_handler(COMPILATION_UNIT_PREPROCESSED_ASSEMBLER,
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			amgc_cparser_no_op,true);
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	set_unit_handler(COMPILATION_UNIT_OBJECT,
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			amgc_cparser_no_op,true);
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}
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int amgc_get_unit_ctx(
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	const struct amgc_driver_ctx *	dctx,
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	const char *			path,
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	struct amgc_unit_ctx **		pctx)
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{
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	struct amgc_unit_ctx_impl *	ctx;
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	int				fd;
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	amgc_init_cparser_unit();
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	if (!dctx)
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		return AMGC_CUSTOM_ERROR(
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			dctx,AMGC_ERR_NULL_CONTEXT);
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	else if (!(ctx = calloc(1,sizeof(*ctx))))
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		return AMGC_SYSTEM_ERROR(dctx);
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	amgc_driver_set_ectx(
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		dctx,0,path);
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	if (strcmp(path,"-"))
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		fd = -1;
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	else if ((fd = amgc_stdin_to_tmp(dctx)) < 0)
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		return amgc_free_unit_ctx_impl(
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			ctx,AMGC_SYSTEM_ERROR(dctx));
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	else if (lseek(fd,0,SEEK_SET < 0))
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		return amgc_free_unit_ctx_impl(
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			ctx,AMGC_NESTED_ERROR(dctx));
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	else if (!(ctx->ccunit.input = fdopen(fd,"r")))
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		return amgc_free_unit_ctx_impl(
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			ctx,AMGC_FILE_ERROR(dctx));
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	/* compilation unit */
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	ctx->ccunit.name		= path;
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	ctx->ccunit.original_name	= path;
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	ctx->ccunit.type		= COMPILATION_UNIT_C;
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	ctx->ccunit.standard		= dctx->cctx->std;
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	/* parse, generate ast, generate ir */
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	if ((process_unit(ctx->cctx.ccenv,&ctx->ccunit)) == false) {
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		if (ctx->ccunit.input)
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			fclose(ctx->ccunit.input);
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		return amgc_free_unit_ctx_impl(
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			ctx,AMGC_CUSTOM_ERROR(dctx,AMGC_ERR_FLOW_ERROR));
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	}
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	memcpy(&ctx->cctx,dctx->cctx,
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		sizeof(ctx->cctx));
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	ctx->dctx	    = dctx;
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	ctx->path	    = path;
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	ctx->uctx.path	    = &ctx->path;
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	ctx->uctx.cctx	    = &ctx->cctx;
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	ctx->uctx.meta	    = &ctx->meta;
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	ctx->uctx.ccunit    = &ctx->ccunit;
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	if (amgc_get_unit_entities(&ctx->uctx,&ctx->meta,&ctx->entities))
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		return amgc_free_unit_ctx_impl(
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			ctx,AMGC_CUSTOM_ERROR(dctx,AMGC_ERR_FLOW_ERROR));
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	ctx->uctx.entities  = ctx->entities;
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	*pctx = &ctx->uctx;
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	return 0;
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}
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void amgc_free_unit_ctx(struct amgc_unit_ctx * ctx)
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{
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	struct amgc_unit_ctx_impl *	ictx;
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	uintptr_t			addr;
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	if (ctx) {
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		addr = (uintptr_t)ctx - offsetof(struct amgc_unit_ctx_impl,uctx);
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		ictx = (struct amgc_unit_ctx_impl *)addr;
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		amgc_free_unit_ctx_impl(ictx,0);
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	}
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}