mirror of
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142dbc7b82
Previously, they were only created when we had any TLS segment. This meant that while the symbol existed, the global itself wouldn't. The result of this was a crash during symbol names writing as it would attempt to write the symbol name of a global that didn't exist. Now we always create them, and instead update its `init` value during `setupMemory`. In the future, the entire symbol (and global) will be removed by the garbage collector.
99 lines
3.7 KiB
Zig
99 lines
3.7 KiB
Zig
const std = @import("std");
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pub fn build(b: *std.Build) void {
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const test_step = b.step("test", "Test");
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b.default_step = test_step;
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add(b, test_step, .Debug);
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add(b, test_step, .ReleaseFast);
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add(b, test_step, .ReleaseSmall);
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add(b, test_step, .ReleaseSafe);
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}
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fn add(b: *std.Build, test_step: *std.Build.Step, optimize_mode: std.builtin.OptimizeMode) void {
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{
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const lib = b.addSharedLibrary(.{
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.name = "lib",
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.root_source_file = .{ .path = "lib.zig" },
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.target = .{
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.cpu_arch = .wasm32,
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.cpu_model = .{ .explicit = &std.Target.wasm.cpu.mvp },
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.cpu_features_add = std.Target.wasm.featureSet(&.{ .atomics, .bulk_memory }),
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.os_tag = .freestanding,
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},
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.optimize = optimize_mode,
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});
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lib.use_lld = false;
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lib.strip = false;
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lib.import_memory = true;
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lib.export_memory = true;
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lib.shared_memory = true;
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lib.max_memory = 67108864;
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lib.single_threaded = false;
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lib.export_symbol_names = &.{"foo"};
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const check_lib = lib.checkObject();
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check_lib.checkStart("Section import");
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check_lib.checkNext("entries 1");
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check_lib.checkNext("module env");
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check_lib.checkNext("name memory"); // ensure we are importing memory
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check_lib.checkStart("Section export");
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check_lib.checkNext("entries 2");
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check_lib.checkNext("name memory"); // ensure we also export memory again
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// This section *must* be emit as the start function is set to the index
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// of __wasm_init_memory
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// release modes will have the TLS segment optimized out in our test-case.
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// This means we won't have __wasm_init_memory in such case, and therefore
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// should also not have a section "start"
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if (optimize_mode == .Debug) {
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check_lib.checkStart("Section start");
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}
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// This section is only and *must* be emit when shared-memory is enabled
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// release modes will have the TLS segment optimized out in our test-case.
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if (optimize_mode == .Debug) {
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check_lib.checkStart("Section data_count");
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check_lib.checkNext("count 3");
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}
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check_lib.checkStart("Section custom");
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check_lib.checkNext("name name");
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check_lib.checkNext("type function");
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if (optimize_mode == .Debug) {
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check_lib.checkNext("name __wasm_init_memory");
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}
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check_lib.checkNext("name __wasm_init_tls");
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check_lib.checkNext("type global");
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// In debug mode the symbol __tls_base is resolved to an undefined symbol
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// from the object file, hence its placement differs than in release modes
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// where the entire tls segment is optimized away, and tls_base will have
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// its original position.
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if (optimize_mode == .Debug) {
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check_lib.checkNext("name __tls_size");
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check_lib.checkNext("name __tls_align");
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check_lib.checkNext("name __tls_base");
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} else {
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check_lib.checkNext("name __tls_base");
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check_lib.checkNext("name __tls_size");
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check_lib.checkNext("name __tls_align");
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}
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check_lib.checkNext("type data_segment");
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if (optimize_mode == .Debug) {
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check_lib.checkNext("names 3");
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check_lib.checkNext("index 0");
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check_lib.checkNext("name .rodata");
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check_lib.checkNext("index 1");
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check_lib.checkNext("name .bss");
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check_lib.checkNext("index 2");
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check_lib.checkNext("name .tdata");
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}
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test_step.dependOn(&check_lib.step);
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}
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}
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