ref: 5496c2e76f82cee8fdc747bc041f493470752b48
dir: /src/asm/fstack.c/
/*
* This file is part of RGBDS.
*
* Copyright (c) 1997-2018, Carsten Sorensen and RGBDS contributors.
*
* SPDX-License-Identifier: MIT
*/
/*
* FileStack routines
*/
#include <errno.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "asm/fstack.h"
#include "asm/lexer.h"
#include "asm/main.h"
#include "asm/output.h"
#include "asm/symbol.h"
#include "extern/err.h"
#include "types.h"
static struct sContext *pFileStack;
static unsigned int nFileStackDepth;
unsigned int nMaxRecursionDepth;
static struct sSymbol *pCurrentMacro;
static YY_BUFFER_STATE CurrentFlexHandle;
static FILE *pCurrentFile;
static uint32_t nCurrentStatus;
char tzCurrentFileName[_MAX_PATH + 1];
static char IncludePaths[MAXINCPATHS][_MAX_PATH + 1];
static int32_t NextIncPath;
static uint32_t nMacroCount;
static char *pCurrentREPTBlock;
static uint32_t nCurrentREPTBlockSize;
static uint32_t nCurrentREPTBlockCount;
static int32_t nCurrentREPTBodyFirstLine;
static int32_t nCurrentREPTBodyLastLine;
uint32_t ulMacroReturnValue;
/*
* defines for nCurrentStatus
*/
#define STAT_isInclude 0 /* 'Normal' state as well */
#define STAT_isMacro 1
#define STAT_isMacroArg 2
#define STAT_isREPTBlock 3
/* Max context stack size */
/*
* Context push and pop
*/
static void pushcontext(void)
{
struct sContext **ppFileStack;
if (++nFileStackDepth > nMaxRecursionDepth)
fatalerror("Recursion limit (%d) exceeded", nMaxRecursionDepth);
ppFileStack = &pFileStack;
while (*ppFileStack)
ppFileStack = &((*ppFileStack)->pNext);
*ppFileStack = malloc(sizeof(struct sContext));
if (*ppFileStack == NULL)
fatalerror("No memory for context");
(*ppFileStack)->FlexHandle = CurrentFlexHandle;
(*ppFileStack)->pNext = NULL;
strcpy((char *)(*ppFileStack)->tzFileName, (char *)tzCurrentFileName);
(*ppFileStack)->nLine = nLineNo;
switch ((*ppFileStack)->nStatus = nCurrentStatus) {
case STAT_isMacroArg:
case STAT_isMacro:
sym_SaveCurrentMacroArgs((*ppFileStack)->tzMacroArgs);
(*ppFileStack)->pMacro = pCurrentMacro;
break;
case STAT_isInclude:
(*ppFileStack)->pFile = pCurrentFile;
break;
case STAT_isREPTBlock:
sym_SaveCurrentMacroArgs((*ppFileStack)->tzMacroArgs);
(*ppFileStack)->pREPTBlock = pCurrentREPTBlock;
(*ppFileStack)->nREPTBlockSize = nCurrentREPTBlockSize;
(*ppFileStack)->nREPTBlockCount = nCurrentREPTBlockCount;
(*ppFileStack)->nREPTBodyFirstLine = nCurrentREPTBodyFirstLine;
(*ppFileStack)->nREPTBodyLastLine = nCurrentREPTBodyLastLine;
break;
default:
fatalerror("%s: Internal error.", __func__);
}
nLineNo = 0;
}
static int32_t popcontext(void)
{
struct sContext *pLastFile, **ppLastFile;
if (nCurrentStatus == STAT_isREPTBlock) {
if (--nCurrentREPTBlockCount) {
char *pREPTIterationWritePtr;
unsigned long nREPTIterationNo;
int nNbCharsWritten;
int nNbCharsLeft;
yy_delete_buffer(CurrentFlexHandle);
CurrentFlexHandle =
yy_scan_bytes(pCurrentREPTBlock,
nCurrentREPTBlockSize);
yy_switch_to_buffer(CurrentFlexHandle);
sym_UseCurrentMacroArgs();
sym_SetMacroArgID(nMacroCount++);
sym_UseNewMacroArgs();
/* Increment REPT count in file path */
pREPTIterationWritePtr =
strrchr(tzCurrentFileName, '~') + 1;
nREPTIterationNo =
strtoul(pREPTIterationWritePtr, NULL, 10);
nNbCharsLeft = sizeof(tzCurrentFileName)
- (pREPTIterationWritePtr - tzCurrentFileName);
nNbCharsWritten = snprintf(pREPTIterationWritePtr,
nNbCharsLeft, "%lu",
nREPTIterationNo + 1);
if (nNbCharsWritten >= nNbCharsLeft) {
/*
* The string is probably corrupted somehow,
* revert the change to avoid a bad error
* output.
*/
sprintf(pREPTIterationWritePtr, "%lu",
nREPTIterationNo);
fatalerror("Cannot write REPT count to file path");
}
nLineNo = nCurrentREPTBodyFirstLine;
return 0;
}
}
pLastFile = pFileStack;
if (pLastFile == NULL)
return 1;
ppLastFile = &pFileStack;
while (pLastFile->pNext) {
ppLastFile = &(pLastFile->pNext);
pLastFile = *ppLastFile;
}
yy_delete_buffer(CurrentFlexHandle);
nLineNo = pLastFile->nLine;
if (nCurrentStatus == STAT_isInclude)
fclose(pCurrentFile);
if (nCurrentStatus == STAT_isMacro
|| nCurrentStatus == STAT_isREPTBlock)
nLineNo++;
CurrentFlexHandle = pLastFile->FlexHandle;
strcpy((char *)tzCurrentFileName, (char *)pLastFile->tzFileName);
switch (nCurrentStatus = pLastFile->nStatus) {
case STAT_isMacroArg:
case STAT_isMacro:
sym_RestoreCurrentMacroArgs(pLastFile->tzMacroArgs);
pCurrentMacro = pLastFile->pMacro;
break;
case STAT_isInclude:
pCurrentFile = pLastFile->pFile;
break;
case STAT_isREPTBlock:
sym_RestoreCurrentMacroArgs(pLastFile->tzMacroArgs);
pCurrentREPTBlock = pLastFile->pREPTBlock;
nCurrentREPTBlockSize = pLastFile->nREPTBlockSize;
nCurrentREPTBlockCount = pLastFile->nREPTBlockCount;
nCurrentREPTBodyFirstLine = pLastFile->nREPTBodyFirstLine;
/* + 1 to account for the `ENDR` line */
nLineNo = pLastFile->nREPTBodyLastLine + 1;
break;
default:
fatalerror("%s: Internal error.", __func__);
}
nFileStackDepth--;
free(*ppLastFile);
*ppLastFile = NULL;
yy_switch_to_buffer(CurrentFlexHandle);
return 0;
}
int32_t fstk_GetLine(void)
{
struct sContext *pLastFile, **ppLastFile;
switch (nCurrentStatus) {
case STAT_isInclude:
/* This is the normal mode, also used when including a file. */
return nLineNo;
case STAT_isMacro:
break; /* Peek top file of the stack */
case STAT_isMacroArg:
return nLineNo; /* ??? */
case STAT_isREPTBlock:
break; /* Peek top file of the stack */
default:
fatalerror("%s: Internal error.", __func__);
}
pLastFile = pFileStack;
if (pLastFile != NULL) {
while (pLastFile->pNext) {
ppLastFile = &(pLastFile->pNext);
pLastFile = *ppLastFile;
}
return pLastFile->nLine;
}
/*
* This is only reached if the lexer is in REPT or MACRO mode but there
* are no saved contexts with the origin of said REPT or MACRO.
*/
fatalerror("%s: Internal error.", __func__);
}
int yywrap(void)
{
return popcontext();
}
/*
* Dump the context stack to stderr
*/
void fstk_Dump(void)
{
const struct sContext *pLastFile;
pLastFile = pFileStack;
while (pLastFile) {
fprintf(stderr, "%s(%d) -> ", pLastFile->tzFileName,
pLastFile->nLine);
pLastFile = pLastFile->pNext;
}
fprintf(stderr, "%s(%d)", tzCurrentFileName, nLineNo);
}
/*
* Dump the string expansion stack to stderr
*/
void fstk_DumpStringExpansions(void)
{
const struct sStringExpansionPos *pExpansion = pCurrentStringExpansion;
while (pExpansion) {
fprintf(stderr, "while expanding symbol \"%s\"\n",
pExpansion->tzName);
pExpansion = pExpansion->pParent;
}
}
/*
* Extra includepath stuff
*/
void fstk_AddIncludePath(char *s)
{
if (NextIncPath == MAXINCPATHS)
fatalerror("Too many include directories passed from command line");
if (snprintf(IncludePaths[NextIncPath++], _MAX_PATH, "%s", s) >= _MAX_PATH)
fatalerror("Include path too long '%s'", s);
}
FILE *fstk_FindFile(char *fname, char **incPathUsed)
{
char path[_MAX_PATH];
int32_t i;
FILE *f;
if (fname == NULL)
return NULL;
f = fopen(fname, "rb");
if (f != NULL || errno != ENOENT) {
if (dependfile)
fprintf(dependfile, "%s: %s\n", tzObjectname, fname);
return f;
}
for (i = 0; i < NextIncPath; ++i) {
/*
* The function snprintf() does not write more than `size` bytes
* (including the terminating null byte ('\0')). If the output
* was truncated due to this limit, the return value is the
* number of characters (excluding the terminating null byte)
* which would have been written to the final string if enough
* space had been available. Thus, a return value of `size` or
* more means that the output was truncated.
*/
int fullpathlen = snprintf(path, sizeof(path), "%s%s",
IncludePaths[i], fname);
if (fullpathlen >= (int)sizeof(path))
continue;
f = fopen(path, "rb");
if (f != NULL || errno != ENOENT) {
if (dependfile) {
fprintf(dependfile, "%s: %s\n", tzObjectname,
path);
}
if (incPathUsed)
*incPathUsed = IncludePaths[i];
return f;
}
}
errno = ENOENT;
return NULL;
}
/*
* Set up an include file for parsing
*/
void fstk_RunInclude(char *tzFileName)
{
char *incPathUsed = "";
FILE *f = fstk_FindFile(tzFileName, &incPathUsed);
if (f == NULL)
err(1, "Unable to open included file '%s'", tzFileName);
pushcontext();
nLineNo = 1;
nCurrentStatus = STAT_isInclude;
snprintf(tzCurrentFileName, sizeof(tzCurrentFileName), "%s%s",
incPathUsed, tzFileName);
pCurrentFile = f;
CurrentFlexHandle = yy_create_buffer(pCurrentFile);
yy_switch_to_buffer(CurrentFlexHandle);
/* Dirty hack to give the INCLUDE directive a linefeed */
yyunput('\n');
nLineNo -= 1;
}
/*
* Set up a macro for parsing
*/
uint32_t fstk_RunMacro(char *s)
{
struct sSymbol *sym = sym_FindMacro(s);
int nPrintedChars;
if (sym == NULL || sym->pMacro == NULL)
return 0;
pushcontext();
sym_SetMacroArgID(nMacroCount++);
/* Minus 1 because there is a newline at the beginning of the buffer */
nLineNo = sym->nFileLine - 1;
sym_UseNewMacroArgs();
nCurrentStatus = STAT_isMacro;
nPrintedChars = snprintf(tzCurrentFileName, _MAX_PATH + 1,
"%s::%s", sym->tzFileName, s);
if (nPrintedChars > _MAX_PATH) {
popcontext();
fatalerror("File name + macro name is too large to fit into buffer");
}
pCurrentMacro = sym;
CurrentFlexHandle = yy_scan_bytes(pCurrentMacro->pMacro,
strlen(pCurrentMacro->pMacro));
yy_switch_to_buffer(CurrentFlexHandle);
return 1;
}
/*
* Set up a macroargument for parsing
*/
void fstk_RunMacroArg(int32_t s)
{
char *sym;
if (s == '@')
s = -1;
else
s -= '0';
sym = sym_FindMacroArg(s);
if (sym == NULL)
fatalerror("No such macroargument");
pushcontext();
nCurrentStatus = STAT_isMacroArg;
snprintf(tzCurrentFileName, _MAX_PATH + 1, "%c", (uint8_t)s);
CurrentFlexHandle = yy_scan_bytes(sym, strlen(sym));
yy_switch_to_buffer(CurrentFlexHandle);
}
/*
* Set up a stringequate for parsing
*/
void fstk_RunString(char *s)
{
const struct sSymbol *pSym = sym_FindSymbol(s);
if (pSym != NULL) {
pushcontext();
nCurrentStatus = STAT_isMacroArg;
strcpy(tzCurrentFileName, s);
CurrentFlexHandle =
yy_scan_bytes(pSym->pMacro, strlen(pSym->pMacro));
yy_switch_to_buffer(CurrentFlexHandle);
} else {
yyerror("No such string symbol '%s'", s);
}
}
/*
* Set up a repeat block for parsing
*/
void fstk_RunRept(uint32_t count, int32_t nReptLineNo)
{
if (count) {
static const char *tzReptStr = "::REPT~1";
/* For error printing to make sense, fake nLineNo */
nCurrentREPTBodyLastLine = nLineNo;
nLineNo = nReptLineNo;
sym_UseCurrentMacroArgs();
pushcontext();
sym_SetMacroArgID(nMacroCount++);
sym_UseNewMacroArgs();
nCurrentREPTBlockCount = count;
nCurrentStatus = STAT_isREPTBlock;
nCurrentREPTBlockSize = ulNewMacroSize;
pCurrentREPTBlock = tzNewMacro;
nCurrentREPTBodyFirstLine = nReptLineNo + 1;
nLineNo = nReptLineNo;
if (strlen(tzCurrentFileName) + strlen(tzReptStr) > _MAX_PATH)
fatalerror("Cannot append \"%s\" to file path",
tzReptStr);
strcat(tzCurrentFileName, tzReptStr);
CurrentFlexHandle =
yy_scan_bytes(pCurrentREPTBlock, nCurrentREPTBlockSize);
yy_switch_to_buffer(CurrentFlexHandle);
}
}
/*
* Initialize the filestack routines
*/
void fstk_Init(char *pFileName)
{
char tzSymFileName[_MAX_PATH + 1 + 2];
snprintf(tzSymFileName, sizeof(tzSymFileName), "\"%s\"", pFileName);
sym_AddString("__FILE__", tzSymFileName);
pFileStack = NULL;
if (strcmp(pFileName, "-") == 0) {
pCurrentFile = stdin;
} else {
pCurrentFile = fopen(pFileName, "rb");
if (pCurrentFile == NULL)
err(1, "Unable to open file '%s'", pFileName);
}
nFileStackDepth = 0;
nMacroCount = 0;
nCurrentStatus = STAT_isInclude;
snprintf(tzCurrentFileName, _MAX_PATH + 1, "%s", pFileName);
CurrentFlexHandle = yy_create_buffer(pCurrentFile);
yy_switch_to_buffer(CurrentFlexHandle);
nLineNo = 1;
}