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// Copyright (c) Microsoft Corporation.
// Licensed under the MIT license.
use proc_macro::*;
use crate::strings::*;
use crate::tree::Tree;
use crate::enabled_info::EnabledInfo;
pub struct EnabledGenerator {
/// scratch tree 1
tree1: Tree,
/// scratch tree 2
tree2: Tree,
/// scratch tree 3
event_tree: Tree,
}
impl EnabledGenerator {
pub fn new(span: Span) -> Self {
return Self {
tree1: Tree::new(span),
tree2: Tree::new(span),
event_tree: Tree::new(span),
};
}
pub fn generate(&mut self, enabled: EnabledInfo) -> TokenStream {
let provider_symbol_string = enabled.provider_symbol.to_string();
let provider_symbol_span = enabled.provider_symbol.span();
// put it all together:
/*
const _EH_KEYWORD = keywords...;
const _EH_TAGn: u16 = TAGn;
static _EH_TRACEPOINT = EventHeaderTracepoint::new(...);
static _EH_TRACEPOINT_PTR = &_EH_TRACEPOINT;
if !_EH_TRACEPOINT.enabled() {
0u32
} else {
enabled_tree...
}
*/
self.event_tree
// identity::<&Provider>(&PROVIDER) // ensure compile error for bad provider symbol
.add_identity_call(
&mut self.tree2,
PROVIDER_PATH,
0,
self.tree1
.add_punct("&")
.add_token(enabled.provider_symbol)
.drain(),
)
.add_punct(";")
// identity::<&usize>(&_eh_define_provider_MY_PROVIDER) // ensure compile error for aliased provider symbol
.add_path(IDENTITY_PATH)
.add_punct("::")
.add_punct("<")
.add_punct("&")
.add_scalar_type_path(&mut self.tree2, USIZE_PATH, 0)
.add_punct(">")
.add_group_paren(
self.tree1
.add_ident("unsafe")
.add_group_curly(
self.tree2
.add_punct("&")
.push_span(provider_symbol_span)
.add_ident(&String::from_iter([
PROVIDER_PTR_VAR_PREFIX,
&provider_symbol_string,
]))
.pop_span()
.drain(),
)
.drain(),
)
.add_punct(";")
// static _EH_TRACEPOINT: EventHeaderTracepoint = EventHeaderTracepoint::new(...);
.add_ident("static")
.add_ident(EH_TRACEPOINT_STATIC)
.add_punct(":")
.add_path(EVENTHEADERTRACEPOINT_PATH)
.add_punct("=")
.add_path_call(
EVENTHEADERTRACEPOINT_NEW_PATH,
self.tree1
// EventHeader::from_parts(...),
.add_path_call(
EVENTHEADER_FROM_PARTS_PATH,
self.tree2
.add_path(HEADER_FLAGS_DEFAULT_PATH)
.add_punct(",")
.add_literal(Literal::u8_unsuffixed(0))
.add_punct(",")
.add_literal(Literal::u16_unsuffixed(0))
.add_punct(",")
.add_literal(Literal::u16_unsuffixed(0))
.add_punct(",")
.add_path(OPCODE_INFO_PATH)
.add_punct(",")
.add_tokens(enabled.level)
.drain(),
)
.add_punct(",")
// _EH_KEYWORD,
.add_tokens(enabled.keyword)
.add_punct(",")
// &[metadata]
.add_punct("&")
.add_group_square([])
.drain(),
)
.add_punct(";")
// #[link_section = "_eh_tracepoints_MY_PROVIDER"]
.add_punct("#")
.add_group_square(
self.tree1
.add_ident("link_section")
.add_punct("=")
.add_literal(Literal::string(&String::from_iter([
TRACEPOINTS_SECTION_PREFIX,
&provider_symbol_string,
])))
.drain(),
)
// static mut _EH_TRACEPOINT_PTR: *const ehi::EventHeaderTracepoint = &_EH_TRACEPOINT;
.add_ident("static")
.add_ident("mut")
.add_ident(EH_TRACEPOINT_PTR_STATIC)
.add_punct(":")
.add_punct("*")
.add_ident("const")
.add_path(EVENTHEADERTRACEPOINT_PATH)
.add_punct("=")
.add_punct("&")
.add_ident(EH_TRACEPOINT_STATIC)
.add_punct(";")
// _EH_TRACEPOINT.enabled()
.add_ident(EH_TRACEPOINT_STATIC)
.add_punct(".")
.add_ident(EH_TRACEPOINT_ENABLED)
.add_group_paren([]);
// Wrap the event in "{...}":
let enabled_tokens = TokenStream::from(TokenTree::Group(Group::new(
Delimiter::Brace,
self.event_tree.drain().collect(),
)));
return enabled_tokens;
}
}