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wasm linker: emit __heap_base and __heap_end globals and datas

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This commit is contained in:
Andrew Kelley 2025-01-05 20:22:34 -08:00
parent 94648a0383
commit 290d97bd09
1 changed files with 20 additions and 12 deletions
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32
src/link/Wasm/Flush.zig
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@ -564,16 +564,9 @@ pub fn finish(f: *Flush, wasm: *Wasm) !void {
for (wasm.globals.keys()) |global_resolution| {
switch (global_resolution.unpack(wasm)) {
.unresolved => unreachable,
.__heap_base => @panic("TODO"),
.__heap_end => @panic("TODO"),
.__stack_pointer => {
try binary_bytes.ensureUnusedCapacity(gpa, 9);
binary_bytes.appendAssumeCapacity(@intFromEnum(std.wasm.Valtype.i32));
binary_bytes.appendAssumeCapacity(1); // mutable
binary_bytes.appendAssumeCapacity(@intFromEnum(std.wasm.Opcode.i32_const));
appendReservedUleb32(binary_bytes, virtual_addrs.stack_pointer);
binary_bytes.appendAssumeCapacity(@intFromEnum(std.wasm.Opcode.end));
},
.__heap_base => try appendGlobal(gpa, binary_bytes, 0, virtual_addrs.heap_base),
.__heap_end => try appendGlobal(gpa, binary_bytes, 0, virtual_addrs.heap_end),
.__stack_pointer => try appendGlobal(gpa, binary_bytes, 1, virtual_addrs.stack_pointer),
.__tls_align => @panic("TODO"),
.__tls_base => @panic("TODO"),
.__tls_size => @panic("TODO"),
@ -781,8 +774,14 @@ pub fn finish(f: *Flush, wasm: *Wasm) !void {
const code_start = binary_bytes.items.len;
append: {
const code = switch (segment_id.unpack(wasm)) {
.__heap_base => @panic("TODO"),
.__heap_end => @panic("TODO"),
.__heap_base => {
mem.writeInt(u32, try binary_bytes.addManyAsArray(gpa, 4), virtual_addrs.heap_base, .little);
break :append;
},
.__heap_end => {
mem.writeInt(u32, try binary_bytes.addManyAsArray(gpa, 4), virtual_addrs.heap_end, .little);
break :append;
},
.__zig_error_names => {
try binary_bytes.appendSlice(gpa, wasm.error_name_bytes.items);
break :append;
@ -1772,3 +1771,12 @@ fn appendReservedI32Const(bytes: *std.ArrayListUnmanaged(u8), val: u32) void {
fn appendReservedUleb32(bytes: *std.ArrayListUnmanaged(u8), val: u32) void {
leb.writeUleb128(bytes.fixedWriter(), val) catch unreachable;
}
fn appendGlobal(gpa: Allocator, bytes: *std.ArrayListUnmanaged(u8), mutable: u8, val: u32) Allocator.Error!void {
try bytes.ensureUnusedCapacity(gpa, 9);
bytes.appendAssumeCapacity(@intFromEnum(std.wasm.Valtype.i32));
bytes.appendAssumeCapacity(mutable);
bytes.appendAssumeCapacity(@intFromEnum(std.wasm.Opcode.i32_const));
appendReservedUleb32(bytes, val);
bytes.appendAssumeCapacity(@intFromEnum(std.wasm.Opcode.end));
}