jimzah/zig
1
0
Fork 0
mirror of https://github.com/ziglang/zig.git synced 2024-11-26 23:22:44 +00:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

wasm-link: update bss linker test

Browse Source 
Updates the linker test to verify the various cases where we must
store the data in the bss segment.
This commit is contained in:
Luuk de Gram 2023-03-08 06:42:23 +01:00
parent bddf138e72
commit d0fb1ef962
No known key found for this signature in database
GPG Key ID: A8CFE58E4DC7D664
2 changed files with 79 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

108
test/link/wasm/bss/build.zig
View File

@ -6,38 +6,78 @@ pub fn build(b: *std.Build) void {
const test_step = b.step("test", "Test");
b.default_step = test_step;
const lib = b.addSharedLibrary(.{
.name = "lib",
.root_source_file = .{ .path = "lib.zig" },
.target = .{ .cpu_arch = .wasm32, .os_tag = .freestanding },
.optimize = .Debug,
});
lib.use_llvm = false;
lib.use_lld = false;
lib.strip = false;
// to make sure the bss segment is emitted, we must import memory
lib.import_memory = true;
lib.install();
const check_lib = lib.checkObject();
// since we import memory, make sure it exists with the correct naming
check_lib.checkStart("Section import");
check_lib.checkNext("entries 1");
check_lib.checkNext("module env"); // default module name is "env"
check_lib.checkNext("name memory"); // as per linker specification
// since we are importing memory, ensure it's not exported
check_lib.checkNotPresent("Section export");
// validate the name of the stack pointer
check_lib.checkStart("Section custom");
check_lib.checkNext("type data_segment");
check_lib.checkNext("names 2");
check_lib.checkNext("index 0");
check_lib.checkNext("name .rodata");
check_lib.checkNext("index 1"); // bss section always last
check_lib.checkNext("name .bss");
test_step.dependOn(&check_lib.step);
add(b, test_step, .Debug, true);
add(b, test_step, .ReleaseFast, false);
add(b, test_step, .ReleaseSmall, false);
add(b, test_step, .ReleaseSafe, true);
}
fn add(b: *std.Build, test_step: *std.Build.Step, optimize_mode: std.builtin.OptimizeMode, is_safe: bool) void {
{
const lib = b.addSharedLibrary(.{
.name = "lib",
.root_source_file = .{ .path = "lib.zig" },
.target = .{ .cpu_arch = .wasm32, .os_tag = .freestanding },
.optimize = optimize_mode,
});
lib.use_llvm = false;
lib.use_lld = false;
lib.strip = false;
// to make sure the bss segment is emitted, we must import memory
lib.import_memory = true;
const check_lib = lib.checkObject();
// since we import memory, make sure it exists with the correct naming
check_lib.checkStart("Section import");
check_lib.checkNext("entries 1");
check_lib.checkNext("module env"); // default module name is "env"
check_lib.checkNext("name memory"); // as per linker specification
// since we are importing memory, ensure it's not exported
check_lib.checkNotPresent("Section export");
// validate the name of the stack pointer
check_lib.checkStart("Section custom");
check_lib.checkNext("type data_segment");
check_lib.checkNext("names 2");
check_lib.checkNext("index 0");
check_lib.checkNext("name .rodata");
// for safe optimization modes `undefined` is stored in data instead of bss.
if (is_safe) {
check_lib.checkNext("index 1");
check_lib.checkNext("name .data");
check_lib.checkNotPresent("name .bss");
} else {
check_lib.checkNext("index 1"); // bss section always last
check_lib.checkNext("name .bss");
}
test_step.dependOn(&check_lib.step);
}
// verify zero'd declaration is stored in bss for all optimization modes.
{
const lib = b.addSharedLibrary(.{
.name = "lib",
.root_source_file = .{ .path = "lib2.zig" },
.target = .{ .cpu_arch = .wasm32, .os_tag = .freestanding },
.optimize = optimize_mode,
});
lib.use_llvm = false;
lib.use_lld = false;
lib.strip = false;
// to make sure the bss segment is emitted, we must import memory
lib.import_memory = true;
const check_lib = lib.checkObject();
check_lib.checkStart("Section custom");
check_lib.checkNext("type data_segment");
check_lib.checkNext("names 2");
check_lib.checkNext("index 0");
check_lib.checkNext("name .rodata");
check_lib.checkNext("index 1");
check_lib.checkNext("name .bss");
test_step.dependOn(&check_lib.step);
}
}

5
test/link/wasm/bss/lib2.zig Normal file
View File

@ -0,0 +1,5 @@
pub var bss: u32 = 0;
export fn foo() void {
_ = bss;
}