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cc65/src/cc65/input.c

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/*****************************************************************************/
/* */
/* input.c */
/* */
/* Input file handling */
/* */
/* */
/* */
/* (C) 2000-2012, Ullrich von Bassewitz */
/* Roemerstrasse 52 */
/* D-70794 Filderstadt */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
#include <stdio.h>
#include <string.h>
#include <errno.h>
/* common */
#include "check.h"
#include "coll.h"
#include "filestat.h"
#include "fname.h"
#include "print.h"
#include "strbuf.h"
#include "xmalloc.h"
/* cc65 */
#include "codegen.h"
#include "error.h"
#include "global.h"
#include "incpath.h"
#include "input.h"
#include "lineinfo.h"
#include "output.h"
#include "preproc.h"
/*****************************************************************************/
/* Data */
/*****************************************************************************/
/* The current input line */
StrBuf* Line;
/* Current and next input character */
char CurC = '\0';
char NextC = '\0';
/* Maximum count of nested includes */
#define MAX_INC_NESTING 16
/* Struct that describes an input file */
typedef struct IFile IFile;
struct IFile {
unsigned Index; /* File index */
unsigned Usage; /* Usage counter */
unsigned long Size; /* File size */
unsigned long MTime; /* Time of last modification */
InputType Type; /* Type of input file */
char Name[1]; /* Name of file (dynamically allocated) */
};
/* Struct that describes an active input file */
typedef struct AFile AFile;
struct AFile {
unsigned Line; /* Line number for this file */
FILE* F; /* Input file stream */
IFile* Input; /* Points to corresponding IFile */
int SearchPath; /* True if we've added a path for this file */
char* PName; /* Presumed name of the file */
PPIfStack IfStack; /* PP #if stack */
int MissingNL; /* Last input line was missing a newline */
};
/* List of all input files */
static Collection IFiles = STATIC_COLLECTION_INITIALIZER;
/* List of all active files */
static Collection AFiles = STATIC_COLLECTION_INITIALIZER;
/* Input stack used when preprocessing. */
static Collection InputStack = STATIC_COLLECTION_INITIALIZER;
/* Counter for the __COUNTER__ macro */
static unsigned MainFileCounter;
/*****************************************************************************/
/* struct IFile */
/*****************************************************************************/
static IFile* NewIFile (const char* Name, InputType Type)
/* Create and return a new IFile */
{
/* Get the length of the name */
unsigned Len = strlen (Name);
/* Allocate a IFile structure */
IFile* IF = (IFile*) xmalloc (sizeof (IFile) + Len);
/* Initialize the fields */
IF->Index = CollCount (&IFiles) + 1;
IF->Usage = 0;
IF->Size = 0;
IF->MTime = 0;
IF->Type = Type;
memcpy (IF->Name, Name, Len+1);
/* Insert the new structure into the IFile collection */
CollAppend (&IFiles, IF);
/* Return the new struct */
return IF;
}
/*****************************************************************************/
/* struct AFile */
/*****************************************************************************/
static AFile* NewAFile (IFile* IF, FILE* F)
/* Create a new AFile, push it onto the stack, add the path of the file to
** the path search list, and finally return a pointer to the new AFile struct.
*/
{
StrBuf Path = AUTO_STRBUF_INITIALIZER;
/* Allocate a AFile structure */
AFile* AF = (AFile*) xmalloc (sizeof (AFile));
/* Initialize the fields */
AF->Line = 0;
AF->F = F;
AF->Input = IF;
AF->PName = 0;
AF->IfStack.Index = -1;
AF->MissingNL = 0;
/* Increment the usage counter of the corresponding IFile. If this
** is the first use, set the file data and output debug info if
** requested.
*/
if (IF->Usage++ == 0) {
/* Get file size and modification time. There a race condition here,
** since we cannot use fileno() (non standard identifier in standard
** header file), and therefore not fstat. When using stat with the
** file name, there's a risk that the file was deleted and recreated
** while it was open. Since mtime and size are only used to check
** if a file has changed in the debugger, we will ignore this problem
** here.
*/
struct stat Buf;
if (FileStat (IF->Name, &Buf) != 0) {
/* Error */
Fatal ("Cannot stat '%s': %s", IF->Name, strerror (errno));
}
IF->Size = (unsigned long) Buf.st_size;
IF->MTime = (unsigned long) Buf.st_mtime;
/* Set the debug data */
g_fileinfo (IF->Name, IF->Size, IF->MTime);
}
/* Insert the new structure into the AFile collection */
CollAppend (&AFiles, AF);
/* Get the path of this file and add it as an extra search path.
** To avoid file search overhead, we will add one path only once.
** This is checked by the PushSearchPath function.
*/
SB_CopyBuf (&Path, IF->Name, FindName (IF->Name) - IF->Name);
SB_Terminate (&Path);
AF->SearchPath = PushSearchPath (UsrIncSearchPath, SB_GetConstBuf (&Path));
SB_Done (&Path);
/* Return the new struct */
return AF;
}
static void FreeAFile (AFile* AF)
/* Free an AFile structure */
{
if (AF->PName != 0) {
xfree (AF->PName);
}
xfree (AF);
}
/*****************************************************************************/
/* Code */
/*****************************************************************************/
static IFile* FindFile (const char* Name)
/* Find the file with the given name in the list of all files. Since the list
** is not large (usually less than 10), I don't care about using hashes or
** similar things and do a linear search.
*/
{
unsigned I;
for (I = 0; I < CollCount (&IFiles); ++I) {
/* Get the file struct */
IFile* IF = (IFile*) CollAt (&IFiles, I);
/* Check the name */
if (strcmp (Name, IF->Name) == 0) {
/* Found, return the struct */
return IF;
}
}
/* Not found */
return 0;
}
void OpenMainFile (const char* Name)
/* Open the main file. Will call Fatal() in case of failures. */
{
AFile* MainFile;
/* Setup a new IFile structure for the main file */
IFile* IF = NewIFile (Name, IT_MAIN);
/* Open the file for reading */
FILE* F = fopen (Name, "r");
if (F == 0) {
/* Cannot open */
Fatal ("Cannot open input file '%s': %s", Name, strerror (errno));
}
/* Allocate a new AFile structure for the file */
MainFile = NewAFile (IF, F);
/* Use this file with PP */
SetPPIfStack (&MainFile->IfStack);
/* Begin PP for this file */
PreprocessBegin ();
/* Allocate the input line buffer */
Line = NewStrBuf ();
/* Update the line infos, so we have a valid line info even at start of
** the main file before the first line is read.
*/
UpdateLineInfo (MainFile->Input, MainFile->Line, Line);
/* Initialize the __COUNTER__ counter */
MainFileCounter = 0;
}
void OpenIncludeFile (const char* Name, InputType IT)
/* Open an include file and insert it into the tables. */
{
char* N;
FILE* F;
IFile* IF;
AFile* AF;
/* Check for the maximum include nesting */
if (CollCount (&AFiles) > MAX_INC_NESTING) {
PPError ("Include nesting too deep");
return;
}
/* Search for the file */
N = SearchFile ((IT == IT_SYSINC)? SysIncSearchPath : UsrIncSearchPath, Name);
if (N == 0) {
PPError ("Include file '%s' not found", Name);
return;
}
/* Search the list of all input files for this file. If we don't find
** it, create a new IFile object.
*/
IF = FindFile (N);
if (IF == 0) {
IF = NewIFile (N, IT);
}
/* We don't need N any longer, since we may now use IF->Name */
xfree (N);
/* Open the file */
F = fopen (IF->Name, "r");
if (F == 0) {
/* Error opening the file */
PPError ("Cannot open include file '%s': %s", IF->Name, strerror (errno));
return;
}
/* Debugging output */
Print (stdout, 1, "Opened include file '%s'\n", IF->Name);
/* Allocate a new AFile structure */
AF = NewAFile (IF, F);
/* Use this file with PP */
SetPPIfStack (&AF->IfStack);
/* Begin PP for this file */
PreprocessBegin ();
}
void CloseIncludeFile (void)
/* Close an include file and switch to the higher level file. Set Input to
** NULL if this was the main file.
*/
{
AFile* Input;
/* Get the number of active input files */
unsigned AFileCount = CollCount (&AFiles);
/* Must have an input file when called */
PRECONDITION (AFileCount > 0);
/* End preprocessor in this file */
PreprocessEnd ();
/* Get the current active input file */
Input = CollLast (&AFiles);
/* Close the current input file (we're just reading so no error check) */
fclose (Input->F);
/* Delete the last active file from the active file collection */
--AFileCount;
CollDelete (&AFiles, AFileCount);
/* If we had added an extra search path for this AFile, remove it */
if (Input->SearchPath) {
PopSearchPath (UsrIncSearchPath);
}
/* Delete the active file structure */
FreeAFile (Input);
/* Use previous file with PP if it is not the main file */
if (AFileCount > 0) {
Input = CollLast (&AFiles);
SetPPIfStack (&Input->IfStack);
}
}
static void GetInputChar (void)
/* Read the next character from the input stream and make CurC and NextC
** valid. If end of line is reached, both are set to NUL, no more lines
** are read by this function.
*/
{
/* Drop all pushed fragments that don't have data left */
while (SB_GetIndex (Line) >= SB_GetLen (Line)) {
/* Cannot read more from this line, check next line on stack if any */
if (CollCount (&InputStack) == 0) {
/* This is THE line */
break;
}
FreeStrBuf (Line);
Line = CollPop (&InputStack);
}
/* Now get the next characters from the line */
if (SB_GetIndex (Line) >= SB_GetLen (Line)) {
CurC = NextC = '\0';
} else {
CurC = SB_AtUnchecked (Line, SB_GetIndex (Line));
if (SB_GetIndex (Line) + 1 < SB_GetLen (Line)) {
/* NextC comes from this fragment */
NextC = SB_AtUnchecked (Line, SB_GetIndex (Line) + 1);
} else {
/* NextC comes from next fragment */
if (CollCount (&InputStack) > 0) {
NextC = ' ';
} else {
NextC = '\0';
}
}
}
}
void NextChar (void)
/* Skip the current input character and read the next one from the input
** stream. CurC and NextC are valid after the call. If end of line is
** reached, both are set to NUL, no more lines are read by this function.
*/
{
/* Skip the last character read */
SB_Skip (Line);
/* Read the next one */
GetInputChar ();
}
void ClearLine (void)
/* Clear the current input line */
{
unsigned I;
/* Remove all pushed fragments from the input stack */
for (I = 0; I < CollCount (&InputStack); ++I) {
FreeStrBuf (CollAtUnchecked (&InputStack, I));
}
CollDeleteAll (&InputStack);
/* Clear the contents of Line */
SB_Clear (Line);
CurC = '\0';
NextC = '\0';
}
StrBuf* InitLine (StrBuf* Buf)
/* Initialize Line from Buf and read CurC and NextC from the new input line.
** The function returns the old input line.
*/
{
StrBuf* OldLine = Line;
Line = Buf;
CurC = SB_LookAt (Buf, SB_GetIndex (Buf));
NextC = SB_LookAt (Buf, SB_GetIndex (Buf) + 1);
return OldLine;
}
int NextLine (void)
/* Get a line from the current input. Returns 0 on end of file with no new
** input bytes.
*/
{
int C;
AFile* Input;
/* Clear the current line */
ClearLine ();
SB_Clear (Line);
/* Must have an input file when called */
if (CollCount(&AFiles) == 0) {
return 0;
}
/* Get the current input file */
Input = CollLast (&AFiles);
/* Read characters until we have one complete line */
while (1) {
/* Read the next character */
C = fgetc (Input->F);
/* Check for EOF */
if (C == EOF) {
if (!Input->MissingNL || SB_NotEmpty (Line)) {
/* Accept files without a newline at the end */
++Input->Line;
/* Assume no new line */
Input->MissingNL = 1;
}
break;
}
/* Assume no new line */
Input->MissingNL = 1;
/* Check for end of line */
if (C == '\n') {
/* We got a new line */
++Input->Line;
/* If the \n is preceeded by a \r, remove the \r, so we can read
** DOS/Windows files under *nix.
*/
if (SB_LookAtLast (Line) == '\r') {
SB_Drop (Line, 1);
}
/* If we don't have a line continuation character at the end,
** we're done with this line. Otherwise replace the character
** by a newline and continue reading.
*/
if (SB_LookAtLast (Line) == '\\') {
Line->Buf[Line->Len-1] = '\n';
} else {
Input->MissingNL = 0;
break;
}
} else if (C != '\0') { /* Ignore embedded NULs */
/* Just some character, add it to the line */
SB_AppendChar (Line, C);
}
}
/* Add a termination character to the string buffer */
SB_Terminate (Line);
/* Initialize the current and next characters. */
InitLine (Line);
/* Create line information for this line */
UpdateLineInfo (Input->Input, Input->Line, Line);
/* Done */
return C != EOF || SB_NotEmpty (Line);
}
int PreprocessNextLine (void)
/* Get a line from opened input files and do preprocess. Returns 0 on end of
** main file.
*/
{
while (NextLine() == 0) {
/* If there is no input file open, bail out. Otherwise get the previous
** input file and start over.
*/
if (CollCount (&AFiles) == 0) {
return 0;
}
/* Leave the current file */
CloseIncludeFile ();
}
/* Do preprocess anyways */
Preprocess ();
/* Write it to the output file if in preprocess-only mode */
if (PreprocessOnly) {
WriteOutput ("%.*s\n", (int) SB_GetLen (Line), SB_GetConstBuf (Line));
}
/* Done */
return 1;
}
const char* GetInputFile (const struct IFile* IF)
/* Return a filename from an IFile struct */
{
return IF->Name;
}
const char* GetCurrentFile (void)
/* Return the name of the current input file */
{
unsigned AFileCount = CollCount (&AFiles);
if (AFileCount > 0) {
const AFile* AF = CollLast (&AFiles);
return AF->PName == 0 ? AF->Input->Name : AF->PName;
} else {
/* No open file */
return "(outside file scope)";
}
}
unsigned GetCurrentLine (void)
/* Return the line number in the current input file */
{
unsigned AFileCount = CollCount (&AFiles);
if (AFileCount > 0) {
const AFile* AF = CollLast (&AFiles);
return AF->Line;
} else {
/* No open file */
return 0;
}
}
void SetCurrentLine (unsigned LineNum)
/* Set the line number in the current input file */
{
unsigned AFileCount = CollCount (&AFiles);
if (AFileCount > 0) {
AFile* AF = CollLast (&AFiles);
AF->Line = LineNum;
}
}
void SetCurrentFilename (const char* Name)
/* Set the presumed name of the current input file */
{
unsigned AFileCount = CollCount (&AFiles);
if (AFileCount > 0) {
size_t Len = strlen (Name);
AFile* AF = CollLast (&AFiles);
if (AF->PName != 0) {
xfree (AF->PName);
}
AF->PName = xmalloc (Len + 1);
memcpy (AF->PName, Name, Len + 1);
}
}
unsigned GetCurrentCounter (void)
/* Return the counter number in the current input file */
{
return MainFileCounter++;
}
static void WriteEscaped (FILE* F, const char* Name)
/* Write a file name to a dependency file escaping spaces */
{
while (*Name) {
if (*Name == ' ') {
/* Escape spaces */
fputc ('\\', F);
}
fputc (*Name, F);
++Name;
}
}
static void WriteDep (FILE* F, InputType Types)
/* Helper function. Writes all file names that match Types to the output */
{
unsigned I;
/* Loop over all files */
unsigned FileCount = CollCount (&IFiles);
for (I = 0; I < FileCount; ++I) {
/* Get the next input file */
const IFile* IF = (const IFile*) CollAt (&IFiles, I);
/* Ignore it if it is not of the correct type */
if ((IF->Type & Types) == 0) {
continue;
}
/* If this is not the first file, add a space */
if (I > 0) {
fputc (' ', F);
}
/* Print the dependency escaping spaces */
WriteEscaped (F, IF->Name);
}
}
static void CreateDepFile (const char* Name, InputType Types)
/* Create a dependency file with the given name and place dependencies for
** all files with the given types there.
*/
{
/* Open the file */
FILE* F = fopen (Name, "w");
if (F == 0) {
Fatal ("Cannot open dependency file '%s': %s", Name, strerror (errno));
}
/* If a dependency target was given, use it, otherwise use the output
** file name as target, followed by a tab character.
*/
if (SB_IsEmpty (&DepTarget)) {
WriteEscaped (F, OutputFilename);
} else {
WriteEscaped (F, SB_GetConstBuf (&DepTarget));
}
fputs (":\t", F);
/* Write out the dependencies for the output file */
WriteDep (F, Types);
fputs ("\n\n", F);
/* Write out a phony dependency for the included files */
WriteDep (F, Types);
fputs (":\n\n", F);
/* Close the file, check for errors */
if (fclose (F) != 0) {
remove (Name);
Fatal ("Cannot write to dependeny file (disk full?)");
}
}
void CreateDependencies (void)
/* Create dependency files requested by the user */
{
if (SB_NotEmpty (&DepName)) {
CreateDepFile (SB_GetConstBuf (&DepName),
IT_MAIN | IT_USRINC);
}
if (SB_NotEmpty (&FullDepName)) {
CreateDepFile (SB_GetConstBuf (&FullDepName),
IT_MAIN | IT_SYSINC | IT_USRINC);
}
}
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