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spirv: minimal start code

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For SPIR-V, only export the main function if it is actually declared. Kernel
entry points will often have parameters and more than one kernel declared.

In general, SPIR-V binaries should mostly be compiled as libraries and not as
executables. However, this start code is required so that we can build test
executables.

Note that a call to isSpirV() would emit the code for that function, even though
the call is at comptime. To save that function from being emitted the checks
are just inlined manually.
This commit is contained in:
Robin Voetter 2023-04-08 19:02:31 +02:00
parent 45b5f46770
commit a7563e453d
No known key found for this signature in database
GPG Key ID: E755662F227CB468
1 changed files with 10 additions and 1 deletions
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11
lib/std/start.zig
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@ -24,7 +24,9 @@ pub const simplified_logic =
builtin.zig_backend == .stage2_aarch64 or
builtin.zig_backend == .stage2_arm or
builtin.zig_backend == .stage2_riscv64 or
builtin.zig_backend == .stage2_sparc64;
builtin.zig_backend == .stage2_sparc64 or
builtin.cpu.arch == .spirv32 or
builtin.cpu.arch == .spirv64;
comptime {
// No matter what, we import the root file, so that any export, test, comptime
@ -43,6 +45,9 @@ comptime {
}
} else if (builtin.os.tag == .wasi and @hasDecl(root, "main")) {
@export(wasiMain2, .{ .name = "_start" });
} else if (builtin.os.tag == .opencl) {
if (@hasDecl(root, "main"))
@export(spirvMain2, .{ .name = "main" });
} else {
if (!@hasDecl(root, "_start")) {
@export(_start2, .{ .name = "_start" });
@ -127,6 +132,10 @@ fn wasiMain2() callconv(.C) noreturn {
}
}
fn spirvMain2() callconv(.Kernel) void {
root.main();
}
fn wWinMainCRTStartup2() callconv(.C) noreturn {
root.main();
exit2(0);