v8/preparser/preparser-process.cc

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// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include "../include/v8stdint.h"
#include "../include/v8-preparser.h"
#include "../src/preparse-data-format.h"
namespace i = v8::internal;
// This file is only used for testing the stand-alone preparser
// library.
// The first argument must be the path of a JavaScript source file.
// Optionally this can be followed by the word "throws" (case sensitive),
// which signals that the parsing is expected to throw - the default is
// to expect the parsing to not throw.
// The command line can further be followed by a message text (the
// *type* of the exception to throw), and even more optionally, the
// start and end position reported with the exception.
//
// This source file is preparsed and tested against the expectations, and if
// successful, the resulting preparser data is written to stdout.
// Diagnostic output is output on stderr.
// The source file must contain only ASCII characters (UTF-8 isn't supported).
// The file is read into memory, so it should have a reasonable size.
// Adapts an ASCII string to the UnicodeInputStream interface.
class AsciiInputStream : public v8::UnicodeInputStream {
public:
AsciiInputStream(uint8_t* buffer, size_t length)
: buffer_(buffer),
end_offset_(static_cast<int>(length)),
offset_(0) { }
virtual ~AsciiInputStream() { }
virtual void PushBack(int32_t ch) {
offset_--;
#ifdef DEBUG
if (offset_ < 0 ||
(ch != ((offset_ >= end_offset_) ? -1 : buffer_[offset_]))) {
fprintf(stderr, "Invalid pushback: '%c' at offset %d.", ch, offset_);
exit(1);
}
#endif
}
virtual int32_t Next() {
if (offset_ >= end_offset_) {
offset_++; // Increment anyway to allow symmetric pushbacks.
return -1;
}
uint8_t next_char = buffer_[offset_];
#ifdef DEBUG
if (next_char > 0x7fu) {
fprintf(stderr, "Non-ASCII character in input: '%c'.", next_char);
exit(1);
}
#endif
offset_++;
return static_cast<int32_t>(next_char);
}
private:
const uint8_t* buffer_;
const int end_offset_;
int offset_;
};
bool ReadBuffer(FILE* source, void* buffer, size_t length) {
size_t actually_read = fread(buffer, 1, length, source);
return (actually_read == length);
}
bool WriteBuffer(FILE* dest, const void* buffer, size_t length) {
size_t actually_written = fwrite(buffer, 1, length, dest);
return (actually_written == length);
}
class PreparseDataInterpreter {
public:
PreparseDataInterpreter(const uint8_t* data, int length)
: data_(data), length_(length), message_(NULL) { }
~PreparseDataInterpreter() {
if (message_ != NULL) delete[] message_;
}
bool valid() {
int header_length =
i::PreparseDataConstants::kHeaderSize * sizeof(int); // NOLINT
return length_ >= header_length;
}
bool throws() {
return valid() &&
word(i::PreparseDataConstants::kHasErrorOffset) != 0;
}
const char* message() {
if (message_ != NULL) return message_;
if (!throws()) return NULL;
int text_pos = i::PreparseDataConstants::kHeaderSize +
i::PreparseDataConstants::kMessageTextPos;
int length = word(text_pos);
char* buffer = new char[length + 1];
for (int i = 1; i <= length; i++) {
int character = word(text_pos + i);
buffer[i - 1] = character;
}
buffer[length] = '\0';
message_ = buffer;
return buffer;
}
int beg_pos() {
if (!throws()) return -1;
return word(i::PreparseDataConstants::kHeaderSize +
i::PreparseDataConstants::kMessageStartPos);
}
int end_pos() {
if (!throws()) return -1;
return word(i::PreparseDataConstants::kHeaderSize +
i::PreparseDataConstants::kMessageEndPos);
}
private:
int word(int offset) {
const int* word_data = reinterpret_cast<const int*>(data_);
if (word_data + offset < reinterpret_cast<const int*>(data_ + length_)) {
return word_data[offset];
}
return -1;
}
const uint8_t* const data_;
const int length_;
const char* message_;
};
template <typename T>
class ScopedPointer {
public:
explicit ScopedPointer(T* pointer) : pointer_(pointer) {}
~ScopedPointer() { delete[] pointer_; }
T& operator[](int index) { return pointer_[index]; }
T* operator*() { return pointer_ ;}
private:
T* pointer_;
};
void fail(v8::PreParserData* data, const char* message, ...) {
va_list args;
va_start(args, message);
vfprintf(stderr, message, args);
va_end(args);
fflush(stderr);
// Print preparser data to stdout.
uint32_t size = data->size();
fprintf(stderr, "LOG: data size: %u\n", size);
if (!WriteBuffer(stdout, data->data(), size)) {
perror("ERROR: Writing data");
fflush(stderr);
}
exit(EXIT_FAILURE);
};
bool IsFlag(const char* arg) {
// Anything starting with '-' is considered a flag.
// It's summarily ignored for now.
return arg[0] == '-';
}
struct ExceptionExpectation {
ExceptionExpectation()
: throws(false), type(NULL), beg_pos(-1), end_pos(-1) { }
bool throws;
const char* type;
int beg_pos;
int end_pos;
};
void CheckException(v8::PreParserData* data,
ExceptionExpectation* expects) {
PreparseDataInterpreter reader(data->data(), data->size());
if (expects->throws) {
if (!reader.throws()) {
if (expects->type == NULL) {
fail(data, "Didn't throw as expected\n");
} else {
fail(data, "Didn't throw \"%s\" as expected\n", expects->type);
}
}
if (expects->type != NULL) {
const char* actual_message = reader.message();
if (strcmp(expects->type, actual_message)) {
fail(data, "Wrong error message. Expected <%s>, found <%s>\n",
expects->type, actual_message);
}
}
if (expects->beg_pos >= 0) {
if (expects->beg_pos != reader.beg_pos()) {
fail(data, "Wrong error start position: Expected %i, found %i\n",
expects->beg_pos, reader.beg_pos());
}
}
if (expects->end_pos >= 0) {
if (expects->end_pos != reader.end_pos()) {
fail(data, "Wrong error end position: Expected %i, found %i\n",
expects->end_pos, reader.end_pos());
}
}
} else if (reader.throws()) {
const char* message = reader.message();
fail(data, "Throws unexpectedly with message: %s\n", message);
}
}
ExceptionExpectation ParseExpectation(int argc, const char* argv[]) {
ExceptionExpectation expects;
// Parse exception expectations from (the remainder of) the command line.
int arg_index = 0;
// Skip any flags.
while (argc > arg_index && IsFlag(argv[arg_index])) arg_index++;
if (argc > arg_index) {
if (strncmp("throws", argv[arg_index], 7)) {
// First argument after filename, if present, must be the verbatim
// "throws", marking that the preparsing should fail with an exception.
fail(NULL, "ERROR: Extra arguments not prefixed by \"throws\".\n");
}
expects.throws = true;
do {
arg_index++;
} while (argc > arg_index && IsFlag(argv[arg_index]));
if (argc > arg_index) {
// Next argument is the exception type identifier.
expects.type = argv[arg_index];
do {
arg_index++;
} while (argc > arg_index && IsFlag(argv[arg_index]));
if (argc > arg_index) {
expects.beg_pos = atoi(argv[arg_index]);
do {
arg_index++;
} while (argc > arg_index && IsFlag(argv[arg_index]));
if (argc > arg_index) {
expects.end_pos = atoi(argv[arg_index]);
}
}
}
}
return expects;
}
int main(int argc, const char* argv[]) {
// Parse command line.
// Format: preparser <scriptfile> ["throws" [<exn-type> [<start> [<end>]]]]
// Any flags on the line are ignored.
// Check for mandatory filename argument.
int arg_index = 1;
while (argc > arg_index && IsFlag(argv[arg_index])) arg_index++;
if (argc <= arg_index) {
fail(NULL, "ERROR: No filename on command line.\n");
}
const char* filename = argv[arg_index];
// Check remainder of command line for exception expectations.
arg_index++;
ExceptionExpectation expects =
ParseExpectation(argc - arg_index, argv + arg_index);
// Open JS file.
FILE* input = fopen(filename, "rb");
if (input == NULL) {
perror("ERROR: Error opening file");
fflush(stderr);
return EXIT_FAILURE;
}
// Find length of JS file.
if (fseek(input, 0, SEEK_END) != 0) {
perror("ERROR: Error during seek");
fflush(stderr);
return EXIT_FAILURE;
}
size_t length = static_cast<size_t>(ftell(input));
rewind(input);
// Read JS file into memory buffer.
ScopedPointer<uint8_t> buffer(new uint8_t[length]);
if (!ReadBuffer(input, *buffer, length)) {
perror("ERROR: Reading file");
fflush(stderr);
return EXIT_FAILURE;
}
fclose(input);
// Preparse input file.
AsciiInputStream input_buffer(*buffer, length);
size_t kMaxStackSize = 64 * 1024 * sizeof(void*); // NOLINT
v8::PreParserData data = v8::Preparse(&input_buffer, kMaxStackSize);
// Fail if stack overflow.
if (data.stack_overflow()) {
fail(&data, "ERROR: Stack overflow\n");
}
// Check that the expected exception is thrown, if an exception is
// expected.
CheckException(&data, &expects);
return EXIT_SUCCESS;
}