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/*
* Copyright 2024 WebAssembly Community Group participants
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef wasm_source_map_h
#define wasm_source_map_h
#include <optional>
#include <unordered_map>
#include "wasm.h"
namespace wasm {
struct MapParseException {
std::string text;
MapParseException(std::string text) : text(text) {}
void dump(std::ostream& o) const;
};
class SourceMapReader {
const std::vector<char>& buffer;
// Current position in the source map buffer.
size_t pos = 0;
// The location in the binary the next debug location will correspond to. 0
// iff there are no more debug locations.
size_t location = 0;
// The file index, line, column, and symbol index the next debug location will
// be offset from.
uint32_t file = 0;
uint32_t line = 1;
uint32_t col = 0;
uint32_t symbol = 0;
// Whether the last read record had position and symbol information.
bool hasInfo = false;
bool hasSymbol = false;
public:
SourceMapReader(const std::vector<char>& buffer) : buffer(buffer) {}
void readHeader(Module& wasm);
std::optional<Function::DebugLocation>
readDebugLocationAt(size_t currLocation);
// Do not reuse debug info across function boundaries.
void finishFunction() { hasInfo = false; }
private:
char peek() {
if (pos >= buffer.size()) {
throw MapParseException("unexpected end of source map");
}
return buffer[pos];
}
char get() {
char c = peek();
++pos;
return c;
}
bool maybeGet(char c) {
if (pos < buffer.size() && peek() == c) {
++pos;
return true;
}
return false;
}
void expect(char c) {
using namespace std::string_literals;
char got = get();
if (got != c) {
throw MapParseException("expected '"s + c + "', got '" + got + "'");
}
}
int32_t readBase64VLQ();
};
} // namespace wasm
#endif // wasm_source_map_h
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