[MC] Change AsmParser to leverage Assembler during evaluation
Teach AsmParser to check with Assembler for when evaluating constant
expressions. This improves the handing of preprocessor expressions
that must be resolved at parse time. This idiom can be found as
assembling-time assertion checks in source-level assemblers. Note that
this relies on the MCStreamer to keep sufficient tabs on Section /
Fragment information which the MCAsmStreamer does not. As a result the
textual output may fail where the equivalent object generation would
pass. This can most easily be resolved by folding the MCAsmStreamer
and MCObjectStreamer together which is planned for in a separate
patch.
Currently, this feature is only enabled for assembly input, keeping IR
compilation consistent between assembly and object generation.
Reviewers: echristo, rnk, probinson, espindola, peter.smith
Reviewed By: peter.smith
Subscribers: eraman, peter.smith, arichardson, jyknight, hiraditya, llvm-commits
Differential Revision: https://reviews.llvm.org/D45164
llvm-svn: 331218
2018-05-01 03:22:40 +08:00
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# RUN: not llvm-mc -triple x86_64-unknown-unknown %s 2>&1 | FileCheck %s --check-prefix=ASM-ERR
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# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown %s | llvm-objdump -j .data -s - | FileCheck %s --check-prefix=OBJDATA
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# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown %s | llvm-objdump -j .text -s - | FileCheck %s --check-prefix=OBJTEXT
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.data
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# OBJDATA: Contents of section .data
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# OBJDATA-NEXT: 0000 aa0506ff
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foo2:
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# ASM-ERR: [[@LINE+1]]:5: error: expected absolute expression
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.if . - foo2 == 0
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.byte 0xaa
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.else
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.byte 0x00
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.endif
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foo3:
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.byte 5
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# ASM-ERR: [[@LINE+1]]:5: error: expected absolute expression
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.if . - foo3 == 1
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.byte 6
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.else
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.byte 7
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.endif
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.byte 0xff
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# nop is a fixed size instruction so this should pass.
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# OBJTEXT: Contents of section .text
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2018-05-19 01:45:48 +08:00
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# OBJTEXT-NEXT: 0000 9090ff34 25000000 00909090 78563412
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# OBJTEXT-NEXT: 0010 78563412 90
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[MC] Change AsmParser to leverage Assembler during evaluation
Teach AsmParser to check with Assembler for when evaluating constant
expressions. This improves the handing of preprocessor expressions
that must be resolved at parse time. This idiom can be found as
assembling-time assertion checks in source-level assemblers. Note that
this relies on the MCStreamer to keep sufficient tabs on Section /
Fragment information which the MCAsmStreamer does not. As a result the
textual output may fail where the equivalent object generation would
pass. This can most easily be resolved by folding the MCAsmStreamer
and MCObjectStreamer together which is planned for in a separate
patch.
Currently, this feature is only enabled for assembly input, keeping IR
compilation consistent between assembly and object generation.
Reviewers: echristo, rnk, probinson, espindola, peter.smith
Reviewed By: peter.smith
Subscribers: eraman, peter.smith, arichardson, jyknight, hiraditya, llvm-commits
Differential Revision: https://reviews.llvm.org/D45164
llvm-svn: 331218
2018-05-01 03:22:40 +08:00
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.text
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text1:
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nop
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# ASM-ERR: [[@LINE+1]]:5: error: expected absolute expression
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.if . - text1 == 1
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nop
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.else
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ret
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.endif
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push gs
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2018-05-19 01:45:48 +08:00
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nop
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nop
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nop
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[MC] Change AsmParser to leverage Assembler during evaluation
Teach AsmParser to check with Assembler for when evaluating constant
expressions. This improves the handing of preprocessor expressions
that must be resolved at parse time. This idiom can be found as
assembling-time assertion checks in source-level assemblers. Note that
this relies on the MCStreamer to keep sufficient tabs on Section /
Fragment information which the MCAsmStreamer does not. As a result the
textual output may fail where the equivalent object generation would
pass. This can most easily be resolved by folding the MCAsmStreamer
and MCObjectStreamer together which is planned for in a separate
patch.
Currently, this feature is only enabled for assembly input, keeping IR
compilation consistent between assembly and object generation.
Reviewers: echristo, rnk, probinson, espindola, peter.smith
Reviewed By: peter.smith
Subscribers: eraman, peter.smith, arichardson, jyknight, hiraditya, llvm-commits
Differential Revision: https://reviews.llvm.org/D45164
llvm-svn: 331218
2018-05-01 03:22:40 +08:00
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# No additional errors.
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#
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# ASM-ERR-NOT: {{[0-9]+}}:{{[0-9]+}}: error:
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2018-05-19 01:45:48 +08:00
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text2:
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.long 0x12345678
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text3:
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.fill (text3-text2)/4, 4, 0x12345678
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nop
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