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/**
* mds — A micro-display server
* Copyright © 2014, 2015 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "call-stack.h"
#include <stdlib.h>
/**
* An entry in the call-stack
*/
typedef struct mds_kbdc_call
{
/**
* The tree node where the call was made
*/
const mds_kbdc_tree_t* tree;
/**
* The position of the line of the tree node
* where the call begins
*/
size_t start;
/**
* The position of the line of the tree node
* where the call end
*/
size_t end;
/**
* A snapshot of the include-stack as it
* looked when the call was being made
*/
mds_kbdc_include_stack_t* include_stack;
} mds_kbdc_call_t;
/**
* Variable whether the latest created error is stored
*/
static mds_kbdc_parse_error_t* error;
/**
* The `result` parameter of root procedure that requires the include-stack
*/
static mds_kbdc_parsed_t* result;
/**
* The original value of `result->pathname`
*/
static char* original_pathname;
/**
* The original value of `result->source_code`
*/
static mds_kbdc_source_code_t* original_source_code;
/**
* Stack of visited function- and macro-calls
*/
static mds_kbdc_call_t* restrict calls = NULL;
/**
* The number elements allocated for `calls`
*/
static size_t calls_size = 0;
/**
* The number elements stored in `calls`
*/
static size_t calls_ptr = 0;
/**
* Add “called from here”-notes
*
* @return Zero on success, -1 on error
*/
int mds_kbdc_call_stack_dump(void)
{
char* old_pathname = result->pathname;
mds_kbdc_source_code_t* old_source_code = result->source_code;
size_t ptr = calls_ptr, iptr;
mds_kbdc_call_t* restrict call;
mds_kbdc_include_stack_t* restrict includes;
while (ptr--)
{
call = calls + ptr;
includes = call->include_stack;
iptr = includes->ptr;
result->pathname = iptr ? includes->stack[iptr - 1]->filename : original_pathname;
result->source_code = iptr ? includes->stack[iptr - 1]->source_code : original_source_code;
NEW_ERROR_(result, NOTE, 1, call->tree->loc_line, call->start, call->end, 1, "called from here");
DUMP_INCLUDE_STACK(iptr);
}
result->pathname = old_pathname;
result->source_code = old_source_code;
return 0;
fail:
result->pathname = old_pathname;
result->source_code = old_source_code;
return -1;
}
/**
* Prepare for usage of call-stacks
*
xo * @param result_ The `result` parameter of root procedure that requires the call-stack
*/
void mds_kbdc_call_stack_begin(mds_kbdc_parsed_t* restrict result_)
{
result = result_;
original_pathname = result_->pathname;
original_source_code = result_->source_code;
}
/**
* Cleanup after usage of call-stacks
*/
void mds_kbdc_call_stack_end(void)
{
result->pathname = original_pathname;
result->source_code = original_source_code;
free(calls), calls = NULL;
calls_size = calls_ptr = 0;
}
/**
* Mark an function- or macro-call
*
* @param tree The tree node where the call was made
* @param start The position of the line of the tree node where the call begins
* @param end The position of the line of the tree node where the call end
* @return Zero on success, -1 on error
*/
int mds_kbdc_call_stack_push(const mds_kbdc_tree_t* restrict tree, size_t start, size_t end)
{
mds_kbdc_call_t* tmp;
mds_kbdc_call_t* call;
if (calls_ptr == calls_size)
{
fail_if (yrealloc(tmp, calls, calls_size + 4, mds_kbdc_call_t));
calls_size += 4;
}
call = calls + calls_ptr++;
call->tree = tree;
call->start = start;
call->end = end;
call->include_stack = mds_kbdc_include_stack_save();
fail_if (call->include_stack == NULL);
return 0;
fail:
return -1;
}
/**
* Undo the lasted not-undone call to `mds_kbdc_call_stack_push`
*
* This function is guaranteed not to modify `errno`
*/
void mds_kbdc_call_stack_pop(void)
{
int saved_errno = errno;
mds_kbdc_include_stack_free(calls[--calls_ptr].include_stack);
errno = saved_errno;
}
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