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link-tests: extract values into variables

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We can then collect multiple variables (currently assumed always
in global scope) and run a comparison with some very basic
arithmetic on the values.
This commit is contained in:
Jakub Konka 2022-06-22 00:49:20 +02:00
parent 3bb4d65b2f
commit b5601a2da6
2 changed files with 182 additions and 20 deletions
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191
lib/std/build/CheckMachOStep.zig
View File

@ -18,6 +18,7 @@ builder: *Builder,
source: build.FileSource,
max_bytes: usize = 20 * 1024 * 1024,
checks: std.ArrayList(Check),
dump_symtab: bool = false,
pub fn create(builder: *Builder, source: build.FileSource) *CheckMachOStep {
const gpa = builder.allocator;
@ -32,32 +33,107 @@ pub fn create(builder: *Builder, source: build.FileSource) *CheckMachOStep {
return self;
}
const Action = union(enum) {
exact_match: []const u8,
extract_var: struct {
fuzzy_match: []const u8,
var_name: []const u8,
var_value: u64,
},
compare: CompareAction,
};
const CompareAction = struct {
expected: union(enum) {
literal: u64,
varr: []const u8,
},
var_stack: std.ArrayList([]const u8),
op_stack: std.ArrayList(Op),
const Op = enum {
add,
};
};
const Check = struct {
builder: *Builder,
phrases: std.ArrayList([]const u8),
actions: std.ArrayList(Action),
fn create(b: *Builder) Check {
return .{
.builder = b,
.phrases = std.ArrayList([]const u8).init(b.allocator),
.actions = std.ArrayList(Action).init(b.allocator),
};
}
fn addPhrase(self: *Check, phrase: []const u8) void {
self.phrases.append(self.builder.dupe(phrase)) catch unreachable;
fn exactMatch(self: *Check, phrase: []const u8) void {
self.actions.append(.{
.exact_match = self.builder.dupe(phrase),
}) catch unreachable;
}
fn extractVar(self: *Check, phrase: []const u8, var_name: []const u8) void {
self.actions.append(.{
.extract_var = .{
.fuzzy_match = self.builder.dupe(phrase),
.var_name = self.builder.dupe(var_name),
.var_value = undefined,
},
}) catch unreachable;
}
};
pub fn check(self: *CheckMachOStep, phrase: []const u8) void {
var new_check = Check.create(self.builder);
new_check.addPhrase(phrase);
new_check.exactMatch(phrase);
self.checks.append(new_check) catch unreachable;
}
pub fn checkNext(self: *CheckMachOStep, phrase: []const u8) void {
assert(self.checks.items.len > 0);
const last = &self.checks.items[self.checks.items.len - 1];
last.addPhrase(phrase);
last.exactMatch(phrase);
}
pub fn checkNextExtract(self: *CheckMachOStep, comptime phrase: []const u8) void {
assert(self.checks.items.len > 0);
const matcher_start = comptime mem.indexOf(u8, phrase, "{") orelse
@compileError("missing { } matcher");
const matcher_end = comptime mem.indexOf(u8, phrase, "}") orelse
@compileError("missing { } matcher");
const last = &self.checks.items[self.checks.items.len - 1];
last.extractVar(phrase[0..matcher_start], phrase[matcher_start + 1 .. matcher_end]);
}
pub fn checkInSymtab(self: *CheckMachOStep) void {
self.dump_symtab = true;
self.check("symtab");
}
pub fn checkCompare(self: *CheckMachOStep, comptime phrase: []const u8, expected: anytype) void {
comptime assert(phrase[0] == '{');
comptime assert(phrase[phrase.len - 1] == '}');
const gpa = self.builder.allocator;
var ca = CompareAction{
.expected = expected,
.var_stack = std.ArrayList([]const u8).init(gpa),
.op_stack = std.ArrayList(CompareAction.Op).init(gpa),
};
var it = mem.tokenize(u8, phrase[1 .. phrase.len - 1], " ");
while (it.next()) |next| {
if (mem.eql(u8, next, "+")) {
ca.op_stack.append(.add) catch unreachable;
} else {
ca.var_stack.append(self.builder.dupe(next)) catch unreachable;
}
}
var new_check = Check.create(self.builder);
new_check.actions.append(.{ .compare = ca }) catch unreachable;
self.checks.append(new_check) catch unreachable;
}
fn make(step: *Step) !void {
@ -79,35 +155,112 @@ fn make(step: *Step) !void {
var metadata = std.ArrayList(u8).init(gpa);
const writer = metadata.writer();
var symtab_cmd: ?macho.symtab_command = null;
var i: u16 = 0;
while (i < hdr.ncmds) : (i += 1) {
var cmd = try macho.LoadCommand.read(gpa, reader);
if (self.dump_symtab and cmd.cmd() == .SYMTAB) {
symtab_cmd = cmd.symtab;
}
try dumpLoadCommand(cmd, i, writer);
try writer.writeByte('\n');
}
if (symtab_cmd) |cmd| {
try writer.writeAll("symtab\n");
const strtab = contents[cmd.stroff..][0..cmd.strsize];
const symtab = @ptrCast(
[*]const macho.nlist_64,
@alignCast(@alignOf(macho.nlist_64), contents.ptr + cmd.symoff),
)[0..cmd.nsyms];
for (symtab) |sym| {
if (sym.stab()) continue;
const sym_name = mem.sliceTo(@ptrCast([*:0]const u8, strtab.ptr + sym.n_strx), 0);
try writer.print("{s} {x}\n", .{ sym_name, sym.n_value });
}
}
var vars = std.StringHashMap(u64).init(gpa);
for (self.checks.items) |chk| {
const first_phrase = chk.phrases.items[0];
const first_action = chk.actions.items[0];
if (mem.indexOf(u8, metadata.items, first_phrase)) |index| {
// TODO backtrack to track current scope
var it = std.mem.tokenize(u8, metadata.items[index..], "\r\n");
switch (first_action) {
.exact_match => |first| {
if (mem.indexOf(u8, metadata.items, first)) |index| {
// TODO backtrack to track current scope
var it = std.mem.tokenize(u8, metadata.items[index..], "\r\n");
outer: for (chk.phrases.items[1..]) |next_phrase| {
while (it.next()) |line| {
if (mem.eql(u8, line, next_phrase)) {
std.debug.print("{s} == {s}\n", .{ line, next_phrase });
continue :outer;
outer: for (chk.actions.items[1..]) |next_action| {
switch (next_action) {
.exact_match => |exact| {
while (it.next()) |line| {
if (mem.eql(u8, line, exact)) {
std.debug.print("{s} == {s}\n", .{ line, exact });
continue :outer;
}
std.debug.print("{s} != {s}\n", .{ line, exact });
} else {
return error.TestFailed;
}
},
.extract_var => |extract| {
const phrase = extract.fuzzy_match;
while (it.next()) |line| {
if (mem.indexOf(u8, line, phrase)) |found| {
std.debug.print("{s} in {s}\n", .{ phrase, line });
// Extract variable and save back in the action.
const trimmed = mem.trim(u8, line[found + phrase.len ..], " ");
const parsed = try std.fmt.parseInt(u64, trimmed, 16);
try vars.putNoClobber(extract.var_name, parsed);
continue :outer;
}
std.debug.print("{s} not in {s}\n", .{ extract.fuzzy_match, line });
}
},
.compare => unreachable,
}
}
std.debug.print("{s} != {s}\n", .{ line, next_phrase });
} else {
return error.TestFailed;
}
}
} else {
return error.TestFailed;
},
.compare => |act| {
var values = std.ArrayList(u64).init(gpa);
try values.ensureTotalCapacity(act.var_stack.items.len);
for (act.var_stack.items) |vv| {
const val = vars.get(vv) orelse return error.TestFailed;
values.appendAssumeCapacity(val);
}
var op_i: usize = 1;
var reduced: u64 = values.items[0];
for (act.op_stack.items) |op| {
const other = values.items[op_i];
switch (op) {
.add => {
reduced += other;
},
}
}
const expected = switch (act.expected) {
.literal => |exp| exp,
.varr => |vv| vars.get(vv) orelse return error.TestFailed,
};
if (reduced != expected) return error.TestFailed;
},
.extract_var => unreachable,
}
}
var it = vars.iterator();
while (it.next()) |entry| {
std.debug.print(" {s} => {x}", .{ entry.key_ptr.*, entry.value_ptr.* });
}
}
fn dumpLoadCommand(lc: macho.LoadCommand, index: u16, writer: anytype) !void {

11
test/link/macho/entry/build.zig
View File

@ -14,8 +14,17 @@ pub fn build(b: *Builder) void {
exe.entry_symbol_name = "_non_main";
const check_exe = exe.checkMachO();
check_exe.check("segname __TEXT");
check_exe.checkNextExtract("vmaddr {vmaddr}");
check_exe.check("cmd MAIN");
check_exe.checkNext("entryoff {x}");
check_exe.checkNextExtract("entryoff {entryoff}");
check_exe.checkInSymtab();
check_exe.checkNextExtract("_non_main {n_value}");
check_exe.checkCompare("{vmaddr entryoff +}", .{ .varr = "n_value" });
test_step.dependOn(&check_exe.step);