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translate-c: Fix macro define of float constant using scientific notation

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Fixes compiler attempting to use null value when translating macro define of float constant using scientific notation with no decimal point
This commit is contained in:
riverbl
2022-01-12 11:07:12 +00:00
committed by Andrew Kelley
parent a5ac138ae2
commit c4681b4889
2 changed files with 16 additions and 10 deletions
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22
src/translate_c.zig
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@@ -5602,16 +5602,18 @@ fn parseCNumLit(c: *Context, m: *MacroCtx) ParseError!Node {
},
.FloatLiteral => |suffix| {
if (suffix != .none) lit_bytes = lit_bytes[0 .. lit_bytes.len - 1];
const dot_index = mem.indexOfScalar(u8, lit_bytes, '.').?;
if (dot_index == 0) {
lit_bytes = try std.fmt.allocPrint(c.arena, "0{s}", .{lit_bytes});
} else if (dot_index + 1 == lit_bytes.len or !std.ascii.isDigit(lit_bytes[dot_index + 1])) {
// If the literal lacks a digit after the `.`, we need to
// add one since `1.` or `1.e10` would be invalid syntax in Zig.
lit_bytes = try std.fmt.allocPrint(c.arena, "{s}0{s}", .{
lit_bytes[0 .. dot_index + 1],
lit_bytes[dot_index + 1 ..],
});
if (mem.indexOfScalar(u8, lit_bytes, '.')) |dot_index| {
if (dot_index == 0) {
lit_bytes = try std.fmt.allocPrint(c.arena, "0{s}", .{lit_bytes});
} else if (dot_index + 1 == lit_bytes.len or !std.ascii.isDigit(lit_bytes[dot_index + 1])) {
// If the literal lacks a digit after the `.`, we need to
// add one since `1.` or `1.e10` would be invalid syntax in Zig.
lit_bytes = try std.fmt.allocPrint(c.arena, "{s}0{s}", .{
lit_bytes[0 .. dot_index + 1],
lit_bytes[dot_index + 1 ..],
});
}
}
if (suffix == .none)

4
test/translate_c.zig
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@@ -1135,11 +1135,15 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
\\#define bar 16.e-2l
\\#define FOO 0.12345
\\#define BAR .12345
\\#define baz 1e1
\\#define BAZ 42e-3f
, &[_][]const u8{
"pub const foo = @as(f32, 3.14);",
"pub const bar = @as(c_longdouble, 16.0e-2);",
"pub const FOO = 0.12345;",
"pub const BAR = 0.12345;",
"pub const baz = 1e1;",
"pub const BAZ = @as(f32, 42e-3);",
});
cases.add("comments",