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257 lines
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5.3 KiB
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<!DOCTYPE HTML>
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<HTML LANG="en-us"
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>invoke-debugger | Common Lisp Nova Spec</TITLE
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><DIV CLASS="breadcrumb"
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><SPAN CLASS="breadcrumb-item"
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><A HREF="index.html"
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>Common Lisp Nova Spec</A
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></SPAN
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="9_Conditions.html"
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>9. Conditions</A
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="9_2_Conditions_Dictionary.html"
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>9.2 Conditions Dictionary</A
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></SPAN
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="f_invoke-debugger.html"
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>invoke-debugger</A
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><DIV CLASS="apropos"
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><DIV CLASS="apropos-io"
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><A HREF="t_simple-warning.html" CLASS="prev"
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>←</A
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><SPAN ID="apropos-label"
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>Apropos </SPAN
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><INPUT ID="apropos" AUTOFOCUS="AUTOFOCUS" PLACEHOLDER="Type here to search" ONINPUT="aproposInput(this);" ONKEYUP="aproposKeyup(event);" ONCHANGE="aproposChange(this);" ONFOCUS="aproposFocus(this);" ONFOCUSOUT="aproposFocusout(this);"
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></DIV
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><DIV CLASS="matter"
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><DIV CLASS="com"
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><DIV CLASS="begincom"
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><HR
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><TABLE WIDTH="100%" CELLSPACING="0" CELLPADDING="0"
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" WIDTH="100%" CLASS="name"
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><SPAN CLASS="idx" DATA-KIND="idxref" DATA-TERM="invoke-debugger"
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></SPAN
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><B
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>invoke-debugger</B
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></TD
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><TD ALIGN="RIGHT" VALIGN="BASELINE" WIDTH="0" NOWRAP="NOWRAP" CLASS="ftype"
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><I
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>Function</I
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></TD
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></TR
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></TABLE
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><HR
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></DIV
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><UL CLASS="subtoc"
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></UL
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><DL
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><DT
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><B
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>Syntax</B
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></DT
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><DD
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><P CLASS="j"
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><B
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>invoke-debugger</B
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> <SPAN CLASS="cmssi"
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>condition</SPAN
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> <SPAN CLASS="arrow"
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>→</SPAN
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>|</P
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></DD
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><DT
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><B
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>Arguments and Values</B
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></DT
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><DD
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><P CLASS="j"
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><VAR CLASS="param"
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>condition</VAR
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> — a <A HREF="26_1_Glossary.html#condition"
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><EM CLASS="term"
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>condition</EM
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></A
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> <A HREF="26_1_Glossary.html#object"
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><EM CLASS="term"
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>object</EM
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></A
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>.</P
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></DD
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><DT
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><B
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>Description</B
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></DT
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><DD
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><P CLASS="j"
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><A HREF="f_invoke-debugger.html" CLASS="funref"
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><B
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>invoke-debugger</B
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></A
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> attempts to enter the debugger with <VAR CLASS="param"
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>condition</VAR
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>. </P
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><P CLASS="j"
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>If <A HREF="v_debugger-hook.html" CLASS="varref"
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><B
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>*debugger-hook*</B
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></A
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> is not <SPAN CLASS="misc"
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><B
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>nil</B
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></SPAN
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>, it should be a <A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>function</EM
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></A
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> (or the name of a <A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>function</EM
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></A
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>) to be called prior to entry to the standard debugger. The <A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>function</EM
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></A
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> is called with <A HREF="v_debugger-hook.html" CLASS="varref"
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><B
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>*debugger-hook*</B
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></A
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> bound to <SPAN CLASS="misc"
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><B
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>nil</B
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></SPAN
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>, and the <A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>function</EM
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></A
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> must accept two arguments: the <VAR CLASS="param"
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>condition</VAR
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> and the <A HREF="26_1_Glossary.html#value"
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><EM CLASS="term"
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>value</EM
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></A
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> of <A HREF="v_debugger-hook.html" CLASS="misc"
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><B
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>*debugger-hook*</B
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></A
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> prior to binding it to <SPAN CLASS="misc"
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><B
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>nil</B
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></SPAN
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>. If the <A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>function</EM
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></A
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> returns normally, the standard debugger is entered. </P
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><P CLASS="j"
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>The standard debugger never directly returns. Return can occur only by a non-local transfer of control, such as the use of a restart function.</P
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></DD
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><DT
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><B
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>Examples</B
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></DT
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><DD
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><PRE CLASS="screen"
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> (ignore-errors ;Normally, this would suppress debugger entry
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(handler-bind ((error #'invoke-debugger)) ;But this forces debugger entry
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(error "Foo.")))
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Debug: Foo.
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To continue, type :CONTINUE followed by an option number:
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1: Return to Lisp Toplevel.
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Debug></PRE
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></DD
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><DT
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><B
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>Side Effects</B
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></DT
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><DD
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><P CLASS="j"
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><A HREF="v_debugger-hook.html" CLASS="varref"
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><B
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>*debugger-hook*</B
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></A
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> is bound to <SPAN CLASS="misc"
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><B
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>nil</B
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></SPAN
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>, program execution is discontinued, and the debugger is entered.</P
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></DD
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><DT
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><B
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>Affected By</B
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></DT
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><DD
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><P CLASS="j"
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><A HREF="v_debug-io.html" CLASS="varref"
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><B
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>*debug-io*</B
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></A
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> and <A HREF="v_debugger-hook.html" CLASS="varref"
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><B
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>*debugger-hook*</B
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></A
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>.</P
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></DD
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><DT
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><B
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>See Also</B
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></DT
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><DD
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><P CLASS="j"
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><A HREF="f_error.html" CLASS="funref"
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><B
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>error</B
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></A
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>, <A HREF="f_break.html" CLASS="funref"
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><B
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>break</B
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></A
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></P
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></DD
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></DL
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></DIV
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></DIV
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><DIV CLASS="footer"
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><DIV CLASS="btmnav"
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><A HREF="t_simple-warning.html" CLASS="prev"
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>→</A
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><DIV CLASS="trail"
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>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
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