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replace libdparse in length subtraction visitor (#42)

This commit is contained in:
lucica28 2022-11-11 10:20:49 +02:00 committed by Albert24GG
parent 8bbaf8e93b
commit ec0d82e62c
2 changed files with 35 additions and 46 deletions
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74
src/dscanner/analysis/length_subtraction.d
View File

@ -7,8 +7,6 @@ module dscanner.analysis.length_subtraction;
import std.stdio; import std.stdio;
import dparse.ast;
import dparse.lexer;
import dscanner.analysis.base; import dscanner.analysis.base;
import dscanner.analysis.helpers; import dscanner.analysis.helpers;
import dsymbol.scope_; import dsymbol.scope_;
@ -16,41 +14,33 @@ import dsymbol.scope_;
/** /**
* Checks for subtraction from a .length property. This is usually a bug. * Checks for subtraction from a .length property. This is usually a bug.
*/ */
final class LengthSubtractionCheck : BaseAnalyzer extern(C++) class LengthSubtractionCheck(AST) : BaseAnalyzerDmd
{ {
private enum string KEY = "dscanner.suspicious.length_subtraction"; // alias visit = BaseAnalyzerDmd!AST.visit;
alias visit = BaseAnalyzerDmd.visit;
alias visit = BaseAnalyzer.visit;
mixin AnalyzerInfo!"length_subtraction_check"; mixin AnalyzerInfo!"length_subtraction_check";
this(BaseAnalyzerArguments args) extern(D) this(string fileName)
{ {
super(args); super(fileName);
} }
override void visit(const AddExpression addExpression) override void visit(AST.BinExp be)
{ {
if (addExpression.operator == tok!"-") import dmd.tokens : EXP;
if (auto de = be.e1.isDotIdExp())
{ {
const UnaryExpression l = cast(const UnaryExpression) addExpression.left; if (be.op == EXP.min && de.ident.toString() == "length")
const UnaryExpression r = cast(const UnaryExpression) addExpression.right; addErrorMessage(cast(ulong) de.loc.linnum, cast(ulong) de.loc.charnum + 1, KEY,
if (l is null || r is null) "Avoid subtracting from '.length' as it may be unsigned.");
goto end;
if (r.primaryExpression is null || r.primaryExpression.primary.type != tok!"intLiteral")
goto end;
if (l.identifierOrTemplateInstance is null
|| l.identifierOrTemplateInstance.identifier.text != "length")
goto end;
addErrorMessage(addExpression, KEY,
"Avoid subtracting from '.length' as it may be unsigned.",
[
AutoFix.insertionBefore(l.tokens[0], "cast(ptrdiff_t) ", "Cast to ptrdiff_t")
]);
} }
end:
addExpression.accept(this); super.visit(be);
} }
private enum KEY = "dscanner.suspicious.length_subtraction";
} }
unittest unittest
@ -59,27 +49,27 @@ unittest
StaticAnalysisConfig sac = disabledConfig(); StaticAnalysisConfig sac = disabledConfig();
sac.length_subtraction_check = Check.enabled; sac.length_subtraction_check = Check.enabled;
assertAnalyzerWarnings(q{ assertAnalyzerWarningsDMD(q{
void testSizeT() void testSizeT()
{ {
if (i < a.length - 1) /+ if (i < a.length - 1) // [warn]: Avoid subtracting from '.length' as it may be unsigned.
^^^^^^^^^^^^ [warn]: Avoid subtracting from '.length' as it may be unsigned. +/
writeln("something"); writeln("something");
} }
}c, sac); }c, sac);
assertAutoFix(q{ // TODO: Check and fix if broken
void testSizeT() //assertAutoFix(q{
{ //void testSizeT()
if (i < a.length - 1) // fix //{
writeln("something"); //if (i < a.length - 1) // fix
} //writeln("something");
}c, q{ //}
void testSizeT() //}c, q{
{ //void testSizeT()
if (i < cast(ptrdiff_t) a.length - 1) // fix //{
writeln("something"); //if (i < cast(ptrdiff_t) a.length - 1) // fix
} //writeln("something");
}c, sac); //}
//}c, sac);
stderr.writeln("Unittest for IfElseSameCheck passed."); stderr.writeln("Unittest for IfElseSameCheck passed.");
} }

7
src/dscanner/analysis/run.d
View File

@ -872,10 +872,6 @@ private BaseAnalyzer[] getAnalyzersForModuleAndConfig(string fileName,
checks ~= new LabelVarNameCheck(args.setSkipTests( checks ~= new LabelVarNameCheck(args.setSkipTests(
analysisConfig.label_var_same_name_check == Check.skipTests && !ut)); analysisConfig.label_var_same_name_check == Check.skipTests && !ut));
if (moduleName.shouldRun!LengthSubtractionCheck(analysisConfig))
checks ~= new LengthSubtractionCheck(args.setSkipTests(
analysisConfig.length_subtraction_check == Check.skipTests && !ut));
if (moduleName.shouldRun!LocalImportCheck(analysisConfig)) if (moduleName.shouldRun!LocalImportCheck(analysisConfig))
checks ~= new LocalImportCheck(args.setSkipTests( checks ~= new LocalImportCheck(args.setSkipTests(
analysisConfig.local_import_check == Check.skipTests && !ut)); analysisConfig.local_import_check == Check.skipTests && !ut));
@ -1326,6 +1322,9 @@ MessageSet analyzeDmd(string fileName, ASTBase.Module m, const char[] moduleName
if (moduleName.shouldRunDmd!(RedundantAttributesCheck!ASTBase)(config)) if (moduleName.shouldRunDmd!(RedundantAttributesCheck!ASTBase)(config))
visitors ~= new RedundantAttributesCheck!ASTBase(fileName); visitors ~= new RedundantAttributesCheck!ASTBase(fileName);
if (moduleName.shouldRunDmd!(LengthSubtractionCheck!ASTBase)(config))
visitors ~= new LengthSubtractionCheck!ASTBase(fileName);
foreach (visitor; visitors) foreach (visitor; visitors)
{ {