ref: d7d524294ba43839eecf6b442691db8223657d23
dir: /src/asm/fstack.c/
/*
* This file is part of RGBDS.
*
* Copyright (c) 1997-2018, Carsten Sorensen and RGBDS contributors.
*
* SPDX-License-Identifier: MIT
*/
#include <sys/stat.h>
#include <assert.h>
#include <errno.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include "asm/fstack.h"
#include "asm/macro.h"
#include "asm/main.h"
#include "asm/symbol.h"
#include "asm/warning.h"
#include "platform.h" /* S_ISDIR (stat macro) */
#define MAXINCPATHS 128
struct Context {
struct Context *parent;
struct FileStackNode *fileInfo;
struct LexerState *lexerState;
uint32_t uniqueID;
struct MacroArgs *macroArgs; /* Macro args are *saved* here */
uint32_t nbReptIters;
int32_t forValue;
int32_t forStep;
char *forName;
};
static struct Context *contextStack;
static size_t contextDepth = 0;
#define DEFAULT_MAX_DEPTH 64
size_t maxRecursionDepth;
static unsigned int nbIncPaths = 0;
static char const *includePaths[MAXINCPATHS];
static const char *dumpNodeAndParents(struct FileStackNode const *node)
{
char const *name;
if (node->type == NODE_REPT) {
assert(node->parent); /* REPT nodes should always have a parent */
struct FileStackReptNode const *reptInfo = (struct FileStackReptNode const *)node;
name = dumpNodeAndParents(node->parent);
fprintf(stderr, "(%" PRIu32 ") -> %s", node->lineNo, name);
for (uint32_t i = reptInfo->reptDepth; i--; )
fprintf(stderr, "::REPT~%" PRIu32, reptInfo->iters[i]);
} else {
name = ((struct FileStackNamedNode const *)node)->name;
if (node->parent) {
dumpNodeAndParents(node->parent);
fprintf(stderr, "(%" PRIu32 ") -> %s", node->lineNo, name);
} else {
fputs(name, stderr);
}
}
return name;
}
void fstk_Dump(struct FileStackNode const *node, uint32_t lineNo)
{
dumpNodeAndParents(node);
fprintf(stderr, "(%" PRIu32 ")", lineNo);
}
void fstk_DumpCurrent(void)
{
if (!contextStack) {
fputs("at top level", stderr);
return;
}
fstk_Dump(contextStack->fileInfo, lexer_GetLineNo());
}
struct FileStackNode *fstk_GetFileStack(void)
{
if (!contextStack)
return NULL;
struct FileStackNode *node = contextStack->fileInfo;
/* Mark node and all of its parents as referenced if not already so they don't get freed */
while (node && !node->referenced) {
node->ID = -1;
node->referenced = true;
node = node->parent;
}
return contextStack->fileInfo;
}
char const *fstk_GetFileName(void)
{
/* Iterating via the nodes themselves skips nested REPTs */
struct FileStackNode const *node = contextStack->fileInfo;
while (node->type != NODE_FILE)
node = node->parent;
return ((struct FileStackNamedNode const *)node)->name;
}
void fstk_AddIncludePath(char const *path)
{
if (path[0] == '\0')
return;
if (nbIncPaths >= MAXINCPATHS) {
error("Too many include directories passed from command line\n");
return;
}
size_t len = strlen(path);
size_t allocSize = len + (path[len - 1] != '/') + 1;
char *str = malloc(allocSize);
if (!str) {
/* Attempt to continue without that path */
error("Failed to allocate new include path: %s\n", strerror(errno));
return;
}
memcpy(str, path, len);
char *end = str + len - 1;
if (*end++ != '/')
*end++ = '/';
*end = '\0';
includePaths[nbIncPaths++] = str;
}
static void printDep(char const *path)
{
if (dependfile) {
fprintf(dependfile, "%s: %s\n", targetFileName, path);
if (generatePhonyDeps)
fprintf(dependfile, "%s:\n", path);
}
}
static bool isPathValid(char const *path)
{
struct stat statbuf;
if (stat(path, &statbuf) != 0)
return false;
/* Reject directories */
return !S_ISDIR(statbuf.st_mode);
}
bool fstk_FindFile(char const *path, char **fullPath, size_t *size)
{
if (!*size) {
*size = 64; /* This is arbitrary, really */
*fullPath = realloc(*fullPath, *size);
if (!*fullPath)
error("realloc error during include path search: %s\n",
strerror(errno));
}
if (*fullPath) {
for (size_t i = 0; i <= nbIncPaths; ++i) {
char const *incPath = i ? includePaths[i - 1] : "";
int len = snprintf(*fullPath, *size, "%s%s", incPath, path);
if (len < 0) {
error("snprintf error during include path search: %s\n",
strerror(errno));
break;
}
/* Oh how I wish `asnprintf` was standard... */
if ((size_t)len >= *size) { /* `len` doesn't include the terminator, `size` does */
*size = len + 1;
*fullPath = realloc(*fullPath, *size);
if (!*fullPath) {
error("realloc error during include path search: %s\n",
strerror(errno));
break;
}
len = sprintf(*fullPath, "%s%s", incPath, path);
if (len < 0) {
error("sprintf error during include path search: %s\n",
strerror(errno));
break;
}
}
if (isPathValid(*fullPath)) {
printDep(*fullPath);
return true;
}
}
}
errno = ENOENT;
if (generatedMissingIncludes)
printDep(path);
return false;
}
bool yywrap(void)
{
uint32_t ifDepth = lexer_GetIFDepth();
if (ifDepth != 0)
fatalerror("Ended block with %" PRIu32 " unterminated IF construct%s\n",
ifDepth, ifDepth == 1 ? "" : "s");
if (contextStack->fileInfo->type == NODE_REPT) { /* The context is a REPT block, which may loop */
struct FileStackReptNode *fileInfo = (struct FileStackReptNode *)contextStack->fileInfo;
/* If the node is referenced, we can't edit it; duplicate it */
if (contextStack->fileInfo->referenced) {
size_t size = sizeof(*fileInfo) + sizeof(fileInfo->iters[0]) * fileInfo->reptDepth;
struct FileStackReptNode *copy = malloc(size);
if (!copy)
fatalerror("Failed to duplicate REPT file node: %s\n", strerror(errno));
/* Copy all info but the referencing */
memcpy(copy, fileInfo, size);
copy->node.next = NULL;
copy->node.referenced = false;
fileInfo = copy;
contextStack->fileInfo = (struct FileStackNode *)fileInfo;
}
/* If this is a FOR, update the symbol value */
if (contextStack->forName && fileInfo->iters[0] <= contextStack->nbReptIters) {
contextStack->forValue += contextStack->forStep;
struct Symbol *sym = sym_AddVar(contextStack->forName,
contextStack->forValue);
/* This error message will refer to the current iteration */
if (sym->type != SYM_VAR)
fatalerror("Failed to update FOR symbol value\n");
}
/* Advance to the next iteration */
fileInfo->iters[0]++;
/* If this wasn't the last iteration, wrap instead of popping */
if (fileInfo->iters[0] <= contextStack->nbReptIters) {
lexer_RestartRept(contextStack->fileInfo->lineNo);
contextStack->uniqueID = macro_UseNewUniqueID();
return false;
}
} else if (!contextStack->parent) {
return true;
}
struct Context *context = contextStack;
contextStack = contextStack->parent;
assert(contextDepth != 0); // This is never supposed to underflow
contextDepth--;
lexer_DeleteState(context->lexerState);
/* Restore args if a macro (not REPT) saved them */
if (context->fileInfo->type == NODE_MACRO)
macro_UseNewArgs(contextStack->macroArgs);
/* Free the file stack node */
if (!context->fileInfo->referenced)
free(context->fileInfo);
/* Free the FOR symbol name */
free(context->forName);
/* Free the entry and make its parent the current entry */
free(context);
lexer_SetState(contextStack->lexerState);
macro_SetUniqueID(contextStack->uniqueID);
return false;
}
/*
* Make sure not to switch the lexer state before calling this, so the saved line no is correct
* BE CAREFUL!! This modifies the file stack directly, you should have set up the file info first
* Callers should set contextStack->lexerState after this so it is not NULL
*/
static void newContext(struct FileStackNode *fileInfo)
{
++contextDepth;
fstk_NewRecursionDepth(maxRecursionDepth); // Only checks if the max depth was exceeded
struct Context *context = malloc(sizeof(*context));
if (!context)
fatalerror("Failed to allocate memory for new context: %s\n", strerror(errno));
fileInfo->parent = contextStack->fileInfo;
fileInfo->lineNo = 0; /* Init to a default value, see struct definition for info */
fileInfo->referenced = false;
fileInfo->lineNo = lexer_GetLineNo();
context->fileInfo = fileInfo;
context->forName = NULL;
/*
* Link new entry to its parent so it's reachable later
* ERRORS SHOULD NOT OCCUR AFTER THIS!!
*/
context->parent = contextStack;
contextStack = context;
}
void fstk_RunInclude(char const *path)
{
char *fullPath = NULL;
size_t size = 0;
if (!fstk_FindFile(path, &fullPath, &size)) {
free(fullPath);
if (generatedMissingIncludes) {
if (verbose)
printf("Aborting (-MG) on INCLUDE file '%s' (%s)\n",
path, strerror(errno));
failedOnMissingInclude = true;
} else {
error("Unable to open included file '%s': %s\n", path, strerror(errno));
}
return;
}
struct FileStackNamedNode *fileInfo = malloc(sizeof(*fileInfo) + size);
if (!fileInfo) {
error("Failed to alloc file info for INCLUDE: %s\n", strerror(errno));
return;
}
fileInfo->node.type = NODE_FILE;
strcpy(fileInfo->name, fullPath);
free(fullPath);
newContext((struct FileStackNode *)fileInfo);
contextStack->lexerState = lexer_OpenFile(fileInfo->name);
if (!contextStack->lexerState)
fatalerror("Failed to set up lexer for file include\n");
lexer_SetStateAtEOL(contextStack->lexerState);
/* We're back at top-level, so most things are reset */
contextStack->uniqueID = 0;
macro_SetUniqueID(0);
}
void fstk_RunMacro(char const *macroName, struct MacroArgs *args)
{
struct Symbol *macro = sym_FindExactSymbol(macroName);
if (!macro) {
error("Macro \"%s\" not defined\n", macroName);
return;
}
if (macro->type != SYM_MACRO) {
error("\"%s\" is not a macro\n", macroName);
return;
}
contextStack->macroArgs = macro_GetCurrentArgs();
/* Compute total length of this node's name: <base name>::<macro> */
size_t reptNameLen = 0;
struct FileStackNode const *node = macro->src;
if (node->type == NODE_REPT) {
struct FileStackReptNode const *reptNode = (struct FileStackReptNode const *)node;
/* 4294967295 = 2^32 - 1, aka UINT32_MAX */
reptNameLen += reptNode->reptDepth * strlen("::REPT~4294967295");
/* Look for next named node */
do {
node = node->parent;
} while (node->type == NODE_REPT);
}
struct FileStackNamedNode const *baseNode = (struct FileStackNamedNode const *)node;
size_t baseLen = strlen(baseNode->name);
size_t macroNameLen = strlen(macro->name);
struct FileStackNamedNode *fileInfo = malloc(sizeof(*fileInfo) + baseLen
+ reptNameLen + 2 + macroNameLen + 1);
if (!fileInfo) {
error("Failed to alloc file info for \"%s\": %s\n", macro->name, strerror(errno));
return;
}
fileInfo->node.type = NODE_MACRO;
/* Print the name... */
char *dest = fileInfo->name;
memcpy(dest, baseNode->name, baseLen);
dest += baseLen;
if (node->type == NODE_REPT) {
struct FileStackReptNode const *reptNode = (struct FileStackReptNode const *)node;
for (uint32_t i = reptNode->reptDepth; i--; ) {
int nbChars = sprintf(dest, "::REPT~%" PRIu32, reptNode->iters[i]);
if (nbChars < 0)
fatalerror("Failed to write macro invocation info: %s\n",
strerror(errno));
dest += nbChars;
}
}
*dest++ = ':';
*dest++ = ':';
memcpy(dest, macro->name, macroNameLen + 1);
newContext((struct FileStackNode *)fileInfo);
contextStack->lexerState = lexer_OpenFileView("MACRO", macro->macro, macro->macroSize,
macro->fileLine);
if (!contextStack->lexerState)
fatalerror("Failed to set up lexer for macro invocation\n");
lexer_SetStateAtEOL(contextStack->lexerState);
contextStack->uniqueID = macro_UseNewUniqueID();
macro_UseNewArgs(args);
}
static bool newReptContext(int32_t reptLineNo, char *body, size_t size)
{
uint32_t reptDepth = contextStack->fileInfo->type == NODE_REPT
? ((struct FileStackReptNode *)contextStack->fileInfo)->reptDepth
: 0;
struct FileStackReptNode *fileInfo = malloc(sizeof(*fileInfo)
+ (reptDepth + 1) * sizeof(fileInfo->iters[0]));
if (!fileInfo) {
error("Failed to alloc file info for REPT: %s\n", strerror(errno));
return false;
}
fileInfo->node.type = NODE_REPT;
fileInfo->reptDepth = reptDepth + 1;
fileInfo->iters[0] = 1;
if (reptDepth)
/* Copy all parent iter counts */
memcpy(&fileInfo->iters[1],
((struct FileStackReptNode *)contextStack->fileInfo)->iters,
reptDepth * sizeof(fileInfo->iters[0]));
newContext((struct FileStackNode *)fileInfo);
/* Correct our line number, which currently points to the `ENDR` line */
contextStack->fileInfo->lineNo = reptLineNo;
contextStack->lexerState = lexer_OpenFileView("REPT", body, size, reptLineNo);
if (!contextStack->lexerState)
fatalerror("Failed to set up lexer for REPT block\n");
lexer_SetStateAtEOL(contextStack->lexerState);
contextStack->uniqueID = macro_UseNewUniqueID();
return true;
}
void fstk_RunRept(uint32_t count, int32_t reptLineNo, char *body, size_t size)
{
if (count == 0)
return;
if (!newReptContext(reptLineNo, body, size))
return;
contextStack->nbReptIters = count;
contextStack->forName = NULL;
}
void fstk_RunFor(char const *symName, int32_t start, int32_t stop, int32_t step,
int32_t reptLineNo, char *body, size_t size)
{
struct Symbol *sym = sym_AddVar(symName, start);
if (sym->type != SYM_VAR)
return;
uint32_t count = 0;
if (step > 0 && start < stop)
count = (stop - start - 1) / step + 1;
else if (step < 0 && stop < start)
count = (start - stop - 1) / -step + 1;
else if (step == 0)
error("FOR cannot have a step value of 0\n");
if ((step > 0 && start > stop) || (step < 0 && start < stop))
warning(WARNING_BACKWARDS_FOR, "FOR goes backwards from %d to %d by %d\n",
start, stop, step);
if (count == 0)
return;
if (!newReptContext(reptLineNo, body, size))
return;
contextStack->nbReptIters = count;
contextStack->forValue = start;
contextStack->forStep = step;
contextStack->forName = strdup(symName);
if (!contextStack->forName)
fatalerror("Not enough memory for FOR symbol name: %s\n", strerror(errno));
}
void fstk_StopRept(void)
{
/* Prevent more iterations */
contextStack->nbReptIters = 0;
}
bool fstk_Break(void)
{
if (contextStack->fileInfo->type != NODE_REPT) {
error("BREAK can only be used inside a REPT/FOR block\n");
return false;
}
fstk_StopRept();
return true;
}
void fstk_NewRecursionDepth(size_t newDepth)
{
if (contextDepth >= newDepth)
fatalerror("Recursion limit (%zu) exceeded\n", newDepth);
maxRecursionDepth = newDepth;
}
void fstk_Init(char const *mainPath, size_t maxDepth)
{
struct LexerState *state = lexer_OpenFile(mainPath);
if (!state)
fatalerror("Failed to open main file!\n");
lexer_SetState(state);
char const *fileName = lexer_GetFileName();
size_t len = strlen(fileName);
struct Context *context = malloc(sizeof(*contextStack));
struct FileStackNamedNode *fileInfo = malloc(sizeof(*fileInfo) + len + 1);
if (!context)
fatalerror("Failed to allocate memory for main context: %s\n", strerror(errno));
if (!fileInfo)
fatalerror("Failed to allocate memory for main file info: %s\n", strerror(errno));
context->fileInfo = (struct FileStackNode *)fileInfo;
/* lineNo and reptIter are unused on the top-level context */
context->fileInfo->parent = NULL;
context->fileInfo->lineNo = 0; // This still gets written to the object file, so init it
context->fileInfo->referenced = false;
context->fileInfo->type = NODE_FILE;
memcpy(fileInfo->name, fileName, len + 1);
context->parent = NULL;
context->lexerState = state;
context->uniqueID = 0;
macro_SetUniqueID(0);
context->nbReptIters = 0;
context->forValue = 0;
context->forStep = 0;
context->forName = NULL;
/* Now that it's set up properly, register the context */
contextStack = context;
/*
* Check that max recursion depth won't allow overflowing node `malloc`s
* This assumes that the rept node is larger
*/
#define DEPTH_LIMIT ((SIZE_MAX - sizeof(struct FileStackReptNode)) / sizeof(uint32_t))
if (maxDepth > DEPTH_LIMIT) {
error("Recursion depth may not be higher than %zu, defaulting to "
EXPAND_AND_STR(DEFAULT_MAX_DEPTH) "\n", DEPTH_LIMIT);
maxRecursionDepth = DEFAULT_MAX_DEPTH;
} else {
maxRecursionDepth = maxDepth;
}
/* Make sure that the default of 64 is OK, though */
assert(DEPTH_LIMIT >= DEFAULT_MAX_DEPTH);
#undef DEPTH_LIMIT
}