forked from mirrors/gecko-dev
06e7d3e8d0
Differential Revision: https://phabricator.services.mozilla.com/D43709 --HG-- extra : moz-landing-system : lando
48 lines
1.5 KiB
Rust
48 lines
1.5 KiB
Rust
// This short example provides the utility to inspect
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// wasm file data section.
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extern crate parity_wasm;
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use std::env;
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fn main() {
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// Example executable takes one argument which must
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// refernce the existing file with a valid wasm module
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let args = env::args().collect::<Vec<_>>();
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if args.len() != 2 {
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println!("Usage: {} somefile.wasm", args[0]);
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return;
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}
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// Here we load module using dedicated for this purpose
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// `deserialize_file` function (which works only with modules)
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let module = parity_wasm::deserialize_file(&args[1]).expect("Failed to load module");
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// We query module for data section. Note that not every valid
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// wasm module must contain a data section. So in case the provided
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// module does not contain data section, we panic with an error
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let data_section = module.data_section().expect("no data section in module");
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// Printing the total count of data segments
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println!("Data segments: {}", data_section.entries().len());
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let mut index = 0;
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for entry in data_section.entries() {
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// Printing the details info of each data segment
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// see `elements::DataSegment` for more properties
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// you can query
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println!(" Entry #{}", index);
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// This shows the initialization member of data segment
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// (expression which must resolve in the linear memory location).
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if let Some(offset) = entry.offset() {
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println!(" init: {}", offset.code()[0]);
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}
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// This shows the total length of the data segment in bytes.
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println!(" size: {}", entry.value().len());
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index += 1;
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}
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}
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